Posted October 22, 2025 by rogerivester Categories:Roger's Articles
Visual observing and locating deep-sky objects manually, making notes and drawing what I see via the eyepiece is fun. I don’t embellish my drawings, but only what I see and with no computer enhancements.
To locate my selected deep-sky objects, for the evening, I just match up my finder view with the atlas and attempt to point the scope at the exact spot.
I use different sizes of brass and steel rings to match my finder(s) field of view. My choice for the last 15 years plus have been the S&T Pocket Sky Atlas’ which are compact and easy to use in the field. The black stars are so much easier to use as compared to atlas’ with white stars on black backgrounds. Plus, I like the larger format pages of the Pocket Sky Atlas’.
If you will notice, I draw circles (on the atlas pages) are for my “selected” objects. I don’t mind all of the drawn circles, soaked pages from dew, which shows the atlas’ have been well used.
A few examples of my humble pencil sketches. I have more than 200 sketches using this format (5 x 8) and about 1,500 using much smaller 3 x 5 cards.
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Posted October 17, 2025 by rogerivester Categories:Roger's Articles
NGC 55 coordinates: RA: 00h 14m 54 Dec. -39º 12m
Roger Ivester from North Carolina: Observing notes from +35º 18′ latitude as following:
Galaxy NGC 55 is the only deep-sky object that I was not able to locate and see of the entire 185 Observer’s Challenge reports. This was due to the low southerly sky position, and not being able to find an observing location without light glow.
I’m hopeful that I can again attempt to see this galaxy, but from another dark-site, which I’ve already selected. For convenience, light weight and ease of handling, I’m planning to use a 4.5-inch f/8 Newtonian. Update: Wednesday, November 12th: Too much sky glow overlooking a small town about five miles away. I spent about an hour…but no luck. Another disappointment.
November 14th 2025: I attempted from my backyard, and with a lightblock curtain, using my 10-inch, but unfortunately the galaxy was in the trees. It seems that I’m just not suppose to see this galaxy. I’ve just got to find that “perfect site” and I’m not giving up yet, as there is still time this month!
My notes from November and December 2012 as following:
Sue French observing from the Little Caymen Island:
November 30, 2005, Little Cayman Island. 10:10 PM EST. 113/450mm (4 ½-inch f/4) reflector. Seeing: good, transparency good, sky, very dark. Scope not collimated. At 14X, easily visible, highly elongated, bright galaxy with brighter elongated core. Runs ESE-WNW. At 34X, very pretty. Large mottled core. Faint star south edge, west side. Galaxy extends farther east than west of core. About 28’ X 2 1/2’. Star mentioned above plus three others cradled south side. At 64X, mottling much more evident. Many faint field stars visible. Skinny brighter triangle southwest.
October 2, 2010, 9:15 pm EDT, with a 130/819mm (5.1-inch f/6.3) apochromat. The seeing and transparency were fair. At 23X there was a bright glow around a fairly bright star. At 37X, the star was in the southern part of a 1¾ arcminute glow. A fainter, 1-arcminute glow continued south from the brighter one. UHC or O-III filter not helpful. At 63X, the southern part showed nicely, and there was a faint star in it. At 102X, the southern part was curved concave west so the whole thing looked like a fat comma in my mirror-reversed view.
October 6, 2010, PSSG. 10:30 PM EDT. 130/819mm (5.1-inch f/6.3) APO. Seeing fairpoor, transparency good. At 37X, although the sky was milky down there, this large galaxy was visible as ~26”ESE – WNW elongated galaxy. The western half was generally brighter. Mag. 10 star ~5’ SE of eastern tip and mag. 12 star S X E of western tip. ~ 4’ wide. At 63X, showed up nicely and was quite uneven in brightness. The bright western area broadly brighter toward the long axis. Eastern had a weaker brightening toward the east end. Three faint stars along south flank: The brightest one mentioned above, the second brightest was south of the middle of the western bright patch, the faintest star was on the galaxy’s edge between the two bright patches. Another star hugged the south side of the west tip.
November 10, 2007, 8:15 pm EST with a 254/1494mm (10-inch f/5.9) Newtonian. The seeing and transparency were fair. At 43X, this bright nebula spanned about ¼º and was brightest around a mag. 7½ star in the center. At 68X, the bright central region of the nebula was elongated north-south, 3 arcminutes tall, with pinched sides and a faint star off the southeastern edge. At 213X, the pinch was prominent south of the mag. 7½ star, and the nebula section south of the pinch was fainter than the northern part.
November 2, 2010. 9:30 pm EDT
I’m afraid my description of that observation was just the sketch. The only details were: 254/1494mm (10-inch f/5.9) Newtonian, 67X. Seeing and transparency, fair.
Jaakko Saloranta from Finland: Observing notes for NGC 55, are from the Canary Islands:
As can be suspected of the low declination, this object never rises above the horizon here in Finland. My latest observation of NGC 55 was made in November last year from the Canary Islands and specifically from the biggest island, Tenerife. I was observing within the Las Cañadas caldera at an altitude of 6,670 feet (2,034 meters) with fairly good observing conditions: naked eye limiting magnitude (NELM) near zenith of 7.1 with SQM-L measurements in the high 21.20s. What makes this observing site pretty good is the high altitude (above the clouds), low humidity and excellent seeing. They don’t have observatories in here for nothing! My notes with the 4.7-inch refractor using several different magnifications read as follows:
A gorgeous sight. Huge, WNW-ESE elongated galaxy with a mottled appearance. NW part of the galaxy contained a bright, elongated nucleus with somewhat mottled appearance. Two brightenings visible within the halo. Larger and brighter knot appeared as slightly NW-SE elongated. The smaller and fainter knot appeared as a nearly stellar, roundish spot in the E side of the galaxy’s halo with a faint mag. 14 star just W of it. A darker void seemed to separate these two possible H-II regions from each other. Several mag. 10-14 stars in vicinity, within the halo.
The following image provided by James Dire from Hawaii:
My image as following was taken with a 102mm (4-inch) apochromatic refractor at f/6.4 with a SBIG ST2000XCM CCD camera. Note the dark “eye” in the galactic core, with the dark lane angled 60º to the disk superimposed over this.
The following image by Mario Motta at (+42º 36′) from Massachusetts with the galaxy being only 6º’s above the horizon!
This one is really tough being so low in the southern sky, but last night (October 18th 2025) I was able to make the following image. The galaxy was 6º above the horizon when I started and ended. It peaked at 8º at the transit of the meridian. The imagine required two hours of 5 minute subs with my 32-inch f/6.5 reflector telescope, and ZWO6200 camera, processed in Pix.
I did not attempt color, as it was so low in the sky and have limited time between rising and setting. NGC 55 is actually close at 6.5 MLY in the constellation of Sculptor.
Now I have never tried this before, but decided to experiment, and somehow it worked out.
My 32-inch scope image of NGC 55 was only 6º above the horizon, so I got the brighter central region with detail, but the fainter outer region, especially lower left, was lost in the background glow. I’d made an image from Florida two years ago, and got the entire galaxy, but lacked detail, and did not capture the fainter region (C14)
Adrien Barrajon’s image (which I processed) from New Zealand had color but missing detail, and was taken with an 8-inch telescope.
So, I attempted to combine all images…taking some time, but took the detail of the center, overlapped that on the full image from my C14 from Florida, and then overlaid the color from the New Zealand color data.
The result is the combined data of three different telescopes, of vastly different sizes, and got this combined image. There are many hidden tricks in pixinsight, and I used up quite a few of them to get the following image. 🙂
Mario Motta
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Posted July 17, 2025 by rogerivester Categories:Roger's Articles
March 26th 2025: After the problems I’ve had over a couple of years I just had to observe galaxy NGC 6118, again in 2025. So, during the late afternoon of March 26th, I set my mount up and pinned my auto-marine fabric to wires to create my light block system in my backyard.
I need or require this (wires and cloth) and in this part of my backyard for southern hemisphere objects only.
3:45 AM: I minimized everything I’d require for an early morning observing session. I included three selected eyepieces in my small Pelican box, not wanting to bring a large box. And I brought all of my necessary items or tools in a small zipper bag: This included pencils, sketch cards, set-up stars, red lights, the large S&T Pocket Alas and other.
When making an early morning observation, it’s important to have everything ready, without the need to run back inside for necessary tools and items forgotten.
4:15 AM: I was looking in the eyepiece and in the area of the galaxy using an 11mm 82º apparent field eyepiece, for a magnification of 104x and a 0.79º true field. I began using field motion and then letting the galaxy drift back into the eyepiece field, and could see a faint elongated blur, with averted vision, but not constantly.
4:45 AM: Increasing the magnification, so I used 2.8x University Optics Klee Barlow, for a magnification of 291x and with a 0.28º true field, but the view was no better. And still only an intermittent blur, but this time more elongated. The galaxy was at such an altitude it was mostly above the light dome. However, there was another problem going on: A wildfire of over over 3,000 acres was raging in Polk County, which is only about 35 miles away. I’m not sure if smoke was an issue or not, but the sky had a reddish look along the horizon. So, probably likely.
5:14 AM: I lifted my eye from the eyepiece and “Gave Up The Ghost” as related to this galaxy for the final time, not likely to return. This galaxy has acted like a ghost for me, now going on two years.
My quest began in the later summer of 2023, and ended on March 27th 2025, but never being able to see the galaxy to a level I would like. Sometimes it’s important to know when good is enough, and time to quit. I made no new sketches or written notes…
This recording and post update @ 4:28 PM (EDT) on March 27th 2025. It was my plans or hope to attempt this galaxy again in the spring of 2025, however, I have not been able to do so. I’d say, most likely….I’ve made my last observation of NGC 6118 known as “The Blinking Galaxy.”
Roger Ivester
Previous observations as following:
I attempted two very early morning observing sessions in March and April of 2024 from my suburban backyard, but again without success.A dark site is really needed to observe any low-surface-brightness galaxy, especially one as dim and faint as NGC 6118.
However, traveling to a dark-site has been over for me now, for many years. The disassembly of a heavy equatorial mount and handling a large solid-tube Newtonian, loading, driving, unloading, reassembly, and then having to do it all again, became just too much. I will just continue to do my best from the backyard.
Almost thirty years ago, I fabricated a humble fabric light-block system (as pictured below) which has helped me many times over the years to see difficult and faint galaxies. It’s easy to set up and take down.
Light pollution will only get worse, so maybe the following inexpensive “light-block” system might work for you also.
I use a medium-duty, lighter weight equatorial mount when observing from my backyard which requires star-hopping….not my GoTo mount from my back deck.
Darker skies from my back deck…
Fortunate for me, I was able to get a problem streetlight in front of my house, changed from a 4,000K LED unshielded light to a 3,000K light with a shield, and with optimum orientation away from my house.
A 5,000K multiple-bulb “residential carport light” is now my greatest problem when observing more southerly deep-sky objects. I have to move from my back-deck to my backyard for all deep-sky objects that are less than “about” +15º north declination.
Good news! The above light has been adjusted as following: February 21st 2025
My plans are now to re-observe NGC 6118 at about 1:00 AM, early May 2025, in an attempt to duplicate my 2024 observation. Will the “Blinking Galaxy” be easier with the now “redirected” 5,000K carport light?
The house is now vacant, waiting for a new owner, and still shines from sunset to sunrise, but now, not toward my house.
Date: May 11th 2024 (early AM observation and seeing NGC 6118) despite looking over the town of Boiling Springs, and the terrible “carport” light
Saturday morning: May 11th 2024 @ 1:00 AM, with a 5.0 NELM overhead, but far less in the location of NGC 6118, due to overlooking the town of Boiling Springs, and the problem “carport light” pictured above.
The following cellphone photo is from that night (May 11th) and beside my telescope. Note the constellation Scorpius toward the right lower corner. Now see the brighter pair of stars, almost in the center of the photo, above or north of Scorpius.
The most northern star, is known as “Yed Prior” at mag. 2.7. The second star toward the south or closest to Scorpius is “Yed Posterior” at mag. 3.2. Now move your telescope slightly to the NE of “Yed Prior” and use your star atlas to dead center, where NGC 6118 should be.
With a bit of difficulty and after almost an hour, I was finally able to see the galaxy. One of my greatest problems had been a pesky LED streetlight in close proximity, shinning directly into my backyard. My portable “make-shift” observatory was the answer to this.
Description: A tiny and subtle brighter middle, which resembles that of a planetary nebula. And like so many planetary nebulae, when using direct vision, vanishes or winks out. The galaxy has a very faint and diffuse irregular halo, which is oriented NE-SW. After observing NGC 6118, it’s easy to understand why its named “The Blinking Galaxy.”
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Posted July 17, 2025 by rogerivester Categories:Uncategorized
Posted July 17th 2025
From “Deep-Sky Wonder’s” By Sue French:
“Moving back to Omicron and dropping 2.7º south-southwest takes you to a golden 7th magnitude star. It ornaments the eastern side of Webb’s Wreath, a little-known asterism first mentioned in the 4th edition (1881) of Thomas Webb’s observing guide “Celestial Objects for Common Telescopes.”
My 105mm scope at 68x reveals 13 additional stars, magnitudes 11 and 12, outlining 11′ x 7′ oval leans northeast and is dented inwards at the bright star.”
RA: 18h 02m Dec. +26 18m
6-09-01: Telescope 105 mm Apochromatic refractor; 610 mm focal length, and a 9 mm Nagler eyepiece for a magnification of 68x.
Pencil Sketch by Sue French as following:The following sketch was made using my 105 mm refractor with the employ of a diagonal.
Images by Mario Motta:
Using my 32-inch telescope, I imaged Webb’s Wreath in RGB and Lum, subtle colors. The images as following present the Wreath with north is at the top and west to the right.
The following image identifies very faint galaxies inside and around the wreath.
Can you still spot the galaxies in the following image?
Observer’s: Keith Rivich and Larry Mitchell
Location: ~10 miles SE of Leakey, Texas
Telescope: 25-inch f/5 Newtonian
SQM-L: 21.3
Seeing: 4 of 10 (Seeing pretty much was limited to around 300x, however, could occasionally go higher.)
Transparency: 10 of 10
Webb’s Wreath itself is a worthy target. My 20 mm Nagler eyepiece framed the wreath quite nicely looking a bit like a lop-sided potato. Larry was going to check GAIA to see if any of these stars may be related. Except for the 7th mag star the rest look suspiciously similar.
UGC 11097:
This galaxy was just out of the frame in the (Mario Motta’s image) but I used it as my star hop base, so I will go ahead and mention the observation. Easy to see at mag. 14.5 with a pretty high surface brightness. Its 1.2′ x .3′ nearly N-S elongation was obvious being brighter in the center and tapering off towards the ends of the arms. A couple of 15th mag stars bracket the galaxy.
PGC 61289 (MCG +4-42-22)
This is the brightest of the galaxies in the Motta image. As suspected at mag 14.6 it was quite easy to see, appearing as a very small oval glow. A mag 14 star sits just off the galaxies northern edge.
2MFGC 14178 (in the image as PGC 1768412)
As suspected this one was tough and fun. When the field first slid into view I strongly suspected I could see some elongation at the right spot. Looking at images there is a 15th mag star just 20″ east of the core of the galaxy, which is depicted as a 14th magnitude “non-star” in Megastar. These two “stars” could easily mimic the elongation I was seeing. I bumped up power to 650x and during moments of good seeing I could distinctly see the arm of the galaxy opposite the 15th mag field star. I called Larry over to take a look and he was seeing what I was seeing. As a bonus he knew nothing about the galaxy before looking.
For the fun part of the observation we put Larry’s NVD into the scope. He had it mated to a 27mm eyepiece so the magnification was quite low. We suspected the NVD devise should work as the galaxy is infrared bright, and we were right. The 15th mag field star was dramatically reduced in brightness so the galaxy, though tiny, was just visible as a complete edge on spiral. The dark lane visible in high res images was not visible to us.
LEDA 1772537 (in the image is listed as a PGC):
As suspected nothing. Nada. Not even a sparkle!
UN-NAMED FACE ON SPIRAL:
We couldn’t see anything of the galaxy, no surprise there, but we could see the 17.5 mag star that sits on the NE edge of the spiral.
Observer: Roger Ivester (North Carolina)
The following pencil sketch was made using a 10-inch f/4.5 EQ Newtonian with an 11mm eyepiece, apparent field of 82º. Magnification: 104x and field-of-view of 0.79º which was a perfect framing for the asterism.
As a follow-up on the four galaxies in and about Webb’s Wreath, they were partially featured in Stephen O’Meara’s column in the May issue of Sky & Telescope (p. 12). Keith’s and Larry Mitchell’s earlier observations of PGC 61289 and PGC 1768412 with Keith’s 25″ were discussed in the article. O’Meara also mentioned the two fainter galaxies within the Wreath itself “most likely require even larger apertures to detect.” One of these is PGC 1772537, an E- or S0-type, and the other is a spiral not catalogued in LEDA (PGC).
The following is a Cloudy Nights post by expert big scope “visual” observer, Steve Gottlieb
Larry Mitchell also included Webb’s Wreath and its galaxies in the Texas Star Party’s “Advanced Observing” list, just a week ago. When Larry came over last Thursday to observe on Jimi Lowrey’s 48″ f/4.0, he requested to look at Webb’s Wreath again to search for the two dim galaxies within the Wreath. Also observing with Jimi and I were Stephen O’Meara, Brent Archinal (from Lowell Observatory), and Doug McCormick (from Houston).
When we observed these galaxies at the end of the observing session, the background sky was jet black in the eyepiece (excellent contrast) and the stars pinpoint at 610x. The unnamed face-on spiral (NED lists the infrared designation WISEA J180231.28+262057.6) was immediately seen as a faint, very small glow, perhaps 10″ in diameter. Although it was fairly easy to see, the visibility may have been enhanced by a faint star at the NE edge.
PGC or LEDA 1772537 was easy to pinpoint, as it lies at the midpoint of a mag 10.8 star 40″ SW and a similar star 40″ NE (two of the main stars in the Wreath). At 610x it was very faint and quite small, perhaps 5″ diameter, but definitely non-stellar. I may have just been seeing the core region of this galaxy. Checking later, I noticed that HyperLeda lists a B magnitude of 17.93 ± 0.50 and NED list a single redshift at z = 0.192.
So, there’s two things interesting about LEDA 1772537. It lies precisely along the Wreath, and if the redshift is accurate, the light of this E or S0-type galaxy has been traveling for 2.4 billion years! (using H0 = 70).
Steve Gottlieb
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For the past few months while watching T Corona Borealis, I didn’t realize there was a potential “observable galaxy” using a 10-inch telescope” and fairly close to the novae star: But, what about a 10-inch from a magnitude ~4.7 NELM location. (?) However, due to the “high-surface brightness” it just might be possible, but very doubtful.
The following information from the “Observing Handbook and Catalog of Deep-Sky Objects” by Christian Luginbuhl and Brian Skiff:
“…galaxy is very small and unconcentrated, but of high surface brightness. In 25 cm it is circular, about 35 arc second diameter, with a faintly granular texture.” L&S
Interesting to note: This galaxy is not listed in either the Herschel-400 or the H-2 lists. I’m wondering if it would be more difficult than galaxy NGC 6118: Which is considered by “most all” amateurs to be the most difficult object in the Herschel-400 list. This galaxy (NGC 6118) was “very, very difficult” for me from my suburban backyard, taking me several observing sessions over a couple years.
Note: For those with a 12-inch telescope, galaxy NGC 5961 can be observed using a 12-inch telescope. This is the second of only two deep-sky objects listed in the Luginbuhl and Skiff Observing Handbook.
Galaxy NGC 5961: “Though it is a small moderately faint object for 30 cm, this galaxy has a high surface brightness.” L&S
If I have a very clear night with excellent transparency, I might give NGC 5958 a try with my 10-inch f/4.5 EQ Newtonian. A clear and transparent night during the summer months is very rare for me, observing from the foothills of North Carolina. Due to increasing light pollution and glow on my best nights I can hardly achieve ~4.7 in a winter sky!
What is a magnitude ~4.7 NELM (naked eye limiting magnitude) and how was it derived?
This is the longtime system used by many “mostly” visual observers, using the stars of the little dipper to determine the faintest star that can be seen naked eye.
I learned this from an Edmund Scientific (Sam Brown books) many years ago, and have been using the NELM system for more than 40 years. However, since the sky glow from the horizons is growing from light pollution, I sometimes (on nights) for reasons might add 1/2 magnitude to my NELM near the zenith.
My backyard Bortle scale number is ~6.5-7.0 which has increased over the past 40 years, as most all backyards in America.
The Bortle scale puts my (NELM) naked eye limiting magnitude at about 4.7-4.8 on a good night, which corresponds pretty close to the Bortle scale.
However, during the summer months, with high-humidity, heat and haze, my NELM sometimes will hover around 4.0 or even less! Defintely not good nights to attempt faint galaxies or nebulae, but can be excellent nights for viewing double and multiple stars.
I’ll never forget the days of growing up in the country and seeing the Milky Way glowing overhead, and extending “seemingly” almost to the southern horizon.
Galaxy NGC 5958 in Corona Borealis: Wikisky.org snapshot as following:
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Posted April 26, 2025 by rogerivester Categories:Uncategorized
Yes, the 6-inch f/6 Newtonian in my opinion, just might be the perfect telescope for the dedicated visual observer. It’s both compact and lightweight, and even with an equatorial mount is easily manageable, and has twice the light gathering power of a 4-inch refractor.
I had a 6-inch Criterion RV-6 almost 50 years ago, but life got busy and sold it. However, I always regretted selling that telescope. So, in about 2017 I bought another 6-inch, but this time with an f/6 focal ratio. The Criterion RV-6 was an f/8. I like the f/6 much better as it’s a bit more versitile, for a wider field of view, and a 2x Barlow can make the f/6, an f/12. And the f/6 is more portable due to the shorter OTA.
I also have a 4.5-inch f/8 Newtonian that was given to me a few months ago, that I plan to use tonight to observe T Corona Borealis field.
After being a serious “visual” observer for at least 40 years and having more than 10 telescopes, I’ve come to the conclusion: A 6-inch f/6 Newtonian (my opinion) might just be the perfect transportable “visual” telescope.
I can also use a GoTo mount with this telescope.
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Posted April 20, 2025 by rogerivester Categories:Roger's Articles
Recently, we had a good friend to lose their father. I wanted to say something meaningful and not just “I’m very sorry” and nothing more. So, quite a few years ago, I read this poem by James S. Tippett and thought it to be something very good to share with anyone who had just lost a loved one. And it has great meaning for all of us to think about from time to time.
The train photo from Public Domain: Strasburg Railroad of Lancaster, Pennsylvania. And “The Train of Life” by James S. Tippett
At birth, we board the train and meet our parents, and we believe they will always travel by our side.
As time goes by, other people will board the train; and they will be significant i.e. our siblings, friends, children, and even the love of your life.
However, at some station our parents will step down from the train, leaving us on this journey alone.
Others will step down over time and leave a permanent vacuum. Some, however, will go so unnoticed that we don’t realize they vacated their seats.
This train ride will be full of joy, sorrow, fantasy, expectations, hellos, goodbyes, and farewells.
Success consists of having a good relationship with all passengers requiring that we give the best of ourselves.
The mystery to everyone is: We do not know at which station we ourselves will step down.
So, we must live in the best way, love, forgive, and offer the best of who we are.
It is important to do this because when the time comes for us to step down and leave our seat empty, we should leave behind beautiful memories for those who will continue to travel on the train of life.
This poem was written “again” by James S. Tippett, but you might find a similar poem with variations via online.
April (2025) photo of me and my family…
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For those waiting and watching for the “predicted outburst” of recurrent novae star, T Corona Borealis, the excitement is building. This outburst could occur at any time, but no one knows when. However, the star is showing fluctuations and a magnitude dip which indicates the event is getting close.
The last outbreak was February 1946
A great personal project for the amateur astronomer: I’m using my iPhone 14 and taking a photo every clear night. And when the outburst occusrs, I’ll have a photo of “the appearance” of a new star! It could be as bright as Alpha Corona Borealis (Alphecca) which is ~2.2 magnitude. I’m also visually observing the star with a telescope.
The following image (May 11th 2025) by Mario Motta of Massachusetts, using a 6-inch f/7.6 refractor. North is up and west to the right, with an approximate 1º field, which matches the AAVSO chart. T CrB is the ~10th magnitude star located in the center and presented very nicely while it’s still asleep.If you are following T CrB, and awaiting the outburst: Roger Ivester (May 14th 2025)
June 11th 2025 @ 10:56 PM: (Hazy conditions and a full moon)
Thursday May 23rd @ 11:04 PM
Sunday May 18th @ 9:52 PM
I took the following photo using an iPhone 14 with a 3-second exposure on Wednesday May 7th at 10:00 PM with a moon illumination of 79%
Tuesday May 5th 2025 @ 12:09 AM with a 61% illuminated moon. I plan to post and maintain “a few of my latest photos” of Corona Borealis via this site. However, I will maintain a photo file on all for future reference.
Remember and again: The last outbreak was February 9th 1946, and renowned variable star observer, Leslie Peltier missed it due to an illness, and his observation was to begin at 2:30 AM.
I’m Using the R CrB chart below…just for the primary constellation magnitude star listings.
The following excerpts are from a Sky & Telescope online article.
Take T Coronae Borealis (T CrB). It’s one of only about 10 stars in the entire sky classified as a recurrent nova, with two recorded outbursts to its name. Normally, the star slumbers at 10th magnitude, but on May 12, 1866, it hit the roof, reaching magnitude +2.0 and outshining every star in Corona Borealis before quickly fading back to obscurity. Eighty years later, on February 9, 1946, it sprang back to life, topping out at magnitude +3.0.
Many variable star observers include it in their nightly runs because it’s easy to find 1° south-southeast of Epsilon (ε) in Corona Borealis and only requires a 3-inch telescope. Not to mention the huge payoff should you happen catch the star during one of its rare explosions. Famed comet hunter and variable star observer Leslie Peltier faithfully kept an eye on T CrB for over 25 years, hoping to catch it in outburst. On that fateful February morning in 1946 he’d set his alarm clock for 2:30 a.m., planning to check in on several favorite stars before dawn. But when he awoke and looked out the window, he felt a cold coming on and allowed himself instead to go back to bed. Big mistake. That very morning, T CrB came back to life.
“I alone am to blame for being remiss in my duties, nevertheless, I still have the feeling that T could have shown me more consideration. We had been friends for many years; on thousands of nights I had watched over it as it slept, and then it arose in my hour of weakness as I nodded at my post. I still am watching it but now it is with a wary eye. There is no warmth between us any more.”
T stayed under the radar for the next 69 years, holding steady around magnitude +10.2–10.3. That began to change in February 2015, when it inched up to +10.0 and remained there until early February this year. That’s when things kicked into high gear with the star steadily growing brighter from late winter through early spring to reach its current magnitude of ~9.2.
Alongside the brightening trend, T’s become bluer as well. Astronomers describe its recent unprecedented activity as a star entering a “super active” state. This last happened in 1938, eight years before its last great outburst.
T CrB followers can’t help but wonder if the next night we look up, Corona Borealis will twinkle with “new” second-magnitude star.
Stars like T CrB involve a red giant closely paired with a white dwarf. The giant feeds hydrogen gas into a swirling accretion disk around a massive, compact white dwarf at a rate a million times greater than the solar wind. Material funnels from the disk onto the dwarf’s surface until it ignites in a thermonuclear explosion similar to a nova. NASA
Recurrent novae are similar to nova and dwarf nova types but with unique characteristics that set them apart. All three types occur in close binary stars and involve mass transfer from a normal star to a small but gravitationally powerful white dwarf. Classical novae have only been seen in outburst once and typically brighten by 8-15 magnitudes before slowly fading back to their pre-outburst brightness. Dwarf novae outburst frequently — every 10-1,000 days — with moderate increases of 2-6 magnitudes. Recurrent novae fall in between and typically vary by 4-9 magnitudes over a 10-100 year period.
T CrB has two components: a red giant star in a close, 227-day orbit with a planet-sized white dwarf. Material spills from the giant and accumulates in an accretion disk around the dwarf. Some of that gas gets funneled down to the dwarf’s surface, becomes compacted and heated, and eventually ignites in a spectacular thermonuclear explosion. We see the results as a sudden brightening of the star.
It’s even theoretically possible for enough matter to accumulate on the dwarf to push it past the 1.4 solar mass Chandrasekhar Limit, forcing the entire star to burn explosively as a Type Ia supernova. At T CrB’s 2,500 light-year distance, it would easily cast shadows!
Maybe we’ll have to wait until 2026 (80 years after the 1946 eruption) for T’s next upheaval. Or maybe not. Either way, let Leslie Peltier’s story serve as a cautionary tale. Keep a close eye on this star every clear night, and expect surprises. Source S&T Magazine.
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Posted March 25, 2025 by rogerivester Categories:Roger's Articles
Sue French: Observer from New York
M40 is a double star near Megrez (Delta Ursae Majoris). Oddly, M40 was onceconsidered a non-existent Messier object. In his 1784 catalogue, Charles Messier described his40th object as: “Two stars very close to one another and very small, placed at the root of thegreat Bear’s tail.” Precessing Messier’s coordinates to equinox 2000 takes us right to such a starpair. Messier noted this double while searching for a “nebulous star” reported by JohannesHevelius. Messier assumed that Hevelius mistook these two stars for a nebula, but the latter wasactually referring to a different pair of stars – also without nebulosity.
To locate M40, start at Megrez and hop 1.1º northeast to mag. 5.5 70 Ursae Majoris.Continue that line for 1/4º to arrive at M40. My 4.1-inch scope at 28x reveals an east-west pairof mag. 10 stars, with the western one slightly brighter. Through my 10-inch scope, I see theprimary as yellow-orange and its companion as yellow-white.
Two galaxies share the field at 118x. NGC 4290 is a small northeast-southwest oval, and NGC 4284 is a tiny faint spotforming a 1½’ triangle with two mag. 13 stars.
The galaxies are about 140 and 190 million light- years away. Although the distances to its stars are poorly known, M40 is probably an optical(unrelated) pair. Independently discovered in 1863 by the German astronomer Friedrich August TheodorWinnecke, M40 carries the double-star designation Winnecke 4. Winnecke is also the originaldiscoverer of eight NGC objects, and ten comets that bear his name.
Roger Ivester: Observer from North Carolina
Due to our recent bad skies, I was unable to make a new observation of M40, andgalaxies NGC 4284 and NGC 4290. I was forced to use a sketch and notes from an earlymorning observation on February 25, 2000.
On that night, I was using a 10-inch reflector from my moderately light-polluted backyard with a 5.8 NELM. It was an especially good night withexcellent transparency.
M40, a pair of mag. 10 stars, also known as Winnecke 4, was very easy with a wideseparation of about 50 seconds of arc. The pair was oriented mostly east-west and both appearedas whitish-yellow in color.
Two faint galaxies were located very close to M40. All three objects were located withina 1/2º field-of-view. Just to the west of M40, lay faint galaxy NGC 4290 at mag. 12.0, elongated NNE-WSW.I saw a very subtle brightness in the central region. Very close and to the west of it was a veryfaint mag. 14 galaxy, NGC 4284, which was extremely difficult, appearing as a faint, mostlyround blur. And during a previous observation from the same location with a friend, and in a side-by-sidecomparison with the 10-inch reflector and an 8-inch Celestron Schmidt-Cassegrain. We couldn’t see NGC 4284 with the 8-inch SC telescope, but could in the 10-inch Newtonian.
The following pencil sketch was made using various graphite pencils and a blank 5 x 8notecard with the colors inverted using a scanner.
Jaakko Saloranta: Observer from Finland
Here’s all I’ve got: With a 4.5-inch reflector @ 152x (20′), the galaxy appeared as afairly faint, NE-SW elongated galaxy, without detail, close to double star M40. NGC 4284 wasinvisible. Altitude of the object was 74°.
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