The Las Vegas Astronomical Society, Death Valley, November 2-3rd 2018 Observing Event, Summary and Photos by Guest Host, Fred Rayworth of Las Vegas

Posted November 5, 2018 by rogerivester
Categories: Uncategorized

Made the 130 mile (126.5 door to door) trip from my house in Las Vegas to Death Valley, this past Friday and went from ~2600 feet, to -189 feet below sea level.

The humidity is about the same from Las Vegas to Death Valley, somewhere in the single digits. Unfortunately, nobody told the upper atmosphere, so we had to deal with high, thin clouds drifting over most of the day.

However, it finally cleared after dark on Friday. I’ll tell you up front, Saturday was a big bust. Not only did the clouds get worse, but when it finally cleared, the winds picked up and made it impossible to view anything.

The other issue was the golf club house. Since it’s acting as the substitute bar, it was lit up like a beacon until 10. Then when they closed down, they still had white security lights reflecting off white walls, which pretty much ruined the northeastern horizon. Oh well…even the Tamarisk trees, which are pretty thick that way, did little to block them. I thought I’d positioned my telescope to block for the most advantage, but the lights were too spread out. To the south, there were some dimmer lights but they didn’t really bother me much.

About 12-15 scopes showed up out of the 20 that signed up, down from the 30 + that usually sign up, despite lots of pre-publicity. We just couldn’t get the crowd out this time. It’s been two years since our last outing due to construction. A couple of people had good reasons, but others? Who knows?

Friday was killer. Since everyone else was showing the usual tourist objects, I concentrated on the Challenge objects.

October’s, the cluster and nebula popped right into view. The cluster was a nice little clump, not so much looking like a coat hangar this time. The LBN nebula was very prominent amongst the two or three stars. However, the non-existent NGC 7133 or whatever it is, was there. It was a halo, a faint glow that extended well away from the LBN. It’s supposedly made up of three IC objects and I could see it plain as day. I never tried an O-III, but a UHC just blanked it all out and only showed a slight hint of the LBN.  Being a reflection nebula, It looked best unfiltered.

I saw all three plus galaxies and a few UGCs as well. I think NGC 147 was quite difficult at first.  NGC 185 was much brighter.  NGC 278  was very bright and compact. Right next to NGC 185, was a tight little UGC galaxy.

The Decembers challenge object, NGC 1003, was dim and flat, if I remember right. It had a couple of UGC and PGC galaxies nearby as well.

I found a few planetaries, open clusters and a bunch of galaxies between Pegasus, Pisces, and especially Fornax, which is blocked from my regular observing location  back in Las Vegas.

I logged over 60 objects total but won’t know the final count for a few days.

It was my desire to go for some more Herschels but most of them were to the northeast and couldn’t look that way because of the golf course clubhouse.

I did take a quick glance at the Horsehead and Flame. I saw the wall and just a hint of the notch unfiltered.’

Thank you, Fred Rayworth

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NGC 147 and NGC 185 – Galaxies in Cassiopeia – November 2018 Observer’s Challenge Report #117

Posted October 29, 2018 by rogerivester
Categories: Observer's Challenge Reports

 NOVEMBER 2018 OBSERVERS CHALLENGE – NGC-147  

Calculating the surface brightness magnitudes:  

Information from Observing handbook and Catalog of Deep-Sky Objects” by Christian B. Luginbulh and Brian A. Skiff :  

“The surface brightness magnitudes (sfc. br.), also from the * RC2, represent the brightness (in V or B, depending on the color of the integrated magnitude ) of a square arc minute patch averaged over the galaxy within the dimensions given for each.  Since this value is an average, the central parts of the galaxy will typically have higher surface brightness and the outer parts lower.”

For complete information concerning (sfc. br.) refer to pages 10-11 Observing Handbook and Catalog of Deep-Sky Objects.”   Luginbuhl and Skiff. 

* RC2 =  “….nearly all data on galaxies are from the Second Reference Catalogue of Bright Galaxies (RC2) by de Vaucouleurs, de Vaucouleurs and Corwin, and the Southern Galaxy Catalog (SGC) by Corwin, de Vancouleurs, and de Vancouleurs.” 

Images provided by Mario Motta from Massachusetts using a 32-inch reflector. 

Photographic information:  NGC  147 was a total of 70 minutes, taken August 10, 2015 with my 32 inch, SBIG STL camera 1001E.  NGC 185 was taken August 15, 2015 total of 50 minutes (must have had a bad frame and dropped, I almost always do at least 60 minutes)   Mario Motta

NGC 147:  Visual magnitude 9.5,   (sfc. br.) 14.5  

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NGC 185:  Visual magnitude 9.2,   (sfc. br.) magnitude 14.3 

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Observing notes and pencil sketches by Sue French from New York:

254/1494mm Newtonian

43×: By sweeping westward from Omicron Cassiopeiae, NGC 185 is immediately visible ensconced in a isosceles triangle of three 8th- to 10th-magnitude stars, the brightest one golden.

68×: The sketch was done at this magnification, where NGC 185 and NGC 147 just fit together in the 72 arcminute field of view.  NGC 185 has a small core that grows gently brighter toward the center. NGC 147 is more slender than its companion and very faint.  There’s a dim star superimposed on NGC 147, barely west of the galaxy’s center. Both galaxies lean roughly northeast by east, with plump NGC 185 have a slightly greater position angle. Most of the stars visible near the galaxies were sketched, but far too many showed in the richly populated Milky Way for me sketch all the field stars.   Sue French 

Pencil sketch with inverted colors:  SF 

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image002

 

Observing notes and pencil sketches by Roger Ivester

NGC 147, with a 10-inch reflector is very difficult at 57x, and best observed at magnifications of 114x and 160x from my 5.0 NELM backyard.  The galaxy is very faint and difficult, due to the extremely low surface brightness.  Elongated NE-SW, without concentration, with a faint star located almost in the halo to the north.  On nights of fair transparency, I’ve been unable to see this galaxy.  A dark sky is essential to successfully observe this object.  

The first time I observed this galaxy was in on October 12th 1993.  My note at that time:  10-inch reflector @ 57x, faint, and difficult with very low surface brightness.  At 95x, still dim, but noted an elongation of NE-SW, low surface brightness, and mostly featureless.  When first observing both NGC 147 and NGC 185 almost twenty five years ago, I used the photo’s in Burnham’s Celestial Handbook to verify my find.   

NGC 185, using a 10-inch reflector at 114x, shows this galaxy as large, mostly round and on nights of excellent transparency, a subtle center brightness.  Far easier and brighter than NGC 147.   Roger Ivester  

 

Pencil sketches:  

NGC 147
Rogers NGC-0147 Inverted
NGC 185
Rogers NGC-0185 Inverted

 

NGC 7129: Cluster+Nebula In Cepheus, October 2018 Observer’s Challenge Report #116

Posted October 26, 2018 by rogerivester
Categories: Observer's Challenge Reports

OCTOBER 2018 OBSERVERS CHALLENGE – NGC-7129

The Observer’s Challenge report is currently “in-progress” and will be posted when all participant reports are received, so please check back.  

NGC 7129: Cluster + Nebula.  Magnitudes;  nebula 11.5;  stars 10 

Image by Mario Motta from Massachusetts: 

30 minutes luminance, 15 minutes each of red-green-blue filters, total 75 minutes imaging.  The image was taken with a 32 inch f/6 reflector. 
A difficult object, and could not use narrowband filters as NGC 7129 is a reflection nebula.  I used color filters, but with the bright stars in the image allowed star bloat, so subs had to be short, 3 minutes each.   Mario Motta 

NGC7129

 

254 mm  1494 focal length  f/5.9  Newtonian Reflector – Notes and sketches by Sue French from New York 

43x: Swept up by moving 1.4 degrees west from the pretty blue and gold optical double Argyle 43 (ARY 43; WDS magnitudes 6.4, 6.8; separation 100 arcseconds).  The nebula appears fairly faint but is readily visible.

115x: The sketch was mostly executed at this magnification, but it was slightly touched up in a couple places at 213x. The brightest part of the nebula occupies a region that includes four stars. The northernmost star in the haze is very dim and couched in its own tiny halo of light.  It stands out better at the higher power. Insubstantial mist trails west-southwest from the main mass, but its extent and form are difficult to perceive.  The southernmost star on the sketch glows with a golden hue.   Sue French 

Pencil sketch with inverted colors:  SF

NGC 7129 inv

 

NGC 7129

 

Notes and sketches by Roger Ivester from North Carolina

In my 10-inch reflector a cluster of four brighter stars with some fainter members, enveloped by nebulosity with greater concentration around the two northernmost stars.  The nebula has fairly high surface brightness, and easy to see at 57x, but best seen at 114x, and without any type of filter.  The sparse cluster and nebulosity is very easy to locate and see, and stands out prominently in the star field.   Roger Ivester 

Pencil sketch using a 10-inch reflector @ 114x.   RI

NGC 7129 Sketch

Pencil sketch with inverted colors:   RI 

Rogers NGC-7129 Inverted

 

Observing Venus Near Inferior Conjunction: By Guest Host, Richard Nugent From Massachusetts

Posted October 23, 2018 by rogerivester
Categories: Uncategorized

    Venus passes through inferior conjunction every 19 months and during the week prior to and after I love to observe her. Why? Because during inferior conjunction Venus is passing between the Earth and the Sun. Its angular diameter is large because it is closest to Earth and it offers a unique view of the planet: a razor-thin crescent! This month, on October 26, Venus will be a generous 6°20’ from the sun making this inferior conjunction particularly easy to observe. Her disk will be slightly larger than one arcminute and she will be 0.6% illuminated. So, how do we observe this!

    The region of the sky this close to the sun is a perilous place to be observing. Your telescope will be unfiltered so aiming the telescope is critical. You do not want to be sweeping in this part of the sky!  In order to know where to look I use SkySafari Pro but any planetarium program will work. If you have a go-to or push-to telescope, carefully align the scope and let the computer guide you to Venus. If you are using good, old-fashioned setting circles make sure your mount is polar aligned, set the R.A. circle to the proper sidereal time, get the right ascension and declination for Venus and go to that spot.  I live in the alt-az world so I get that info from my program and then use the phone’s compass and tilt meter to get to the correct spot. I find the tilt meter to be more accurate than the compass so I get close then carefully…I mean CAREFULLY sweep in azimuth until I spot Venus. I typically use a 10-inch, f/5 dob with an 80mm Finder. Today, Venus was easily visible as a crescent in the finder. Once it’s in the finder you’re home free!

   One important tip is to pre-focus your eyepiece. If Venus is out of focus it’s crescent will smear out and blend into the bright background. I start with a low power eyepiece and graduate to my 16mm Nagler. This gives about 75x with a generous amount of sky around Venus. The seeing is usually terrible during the day but I find that an aperture mask is particularly useful in reducing the turbulence. Today, I ran the scope at 60mm. [f/19.9 with a 0.8mm exit pupil] The crescent was magnificent! During moments of steadier seeing I thought I could see the entire limb of Venus but that just might have been my brain connecting the cusps to complete the circle. I’ll look a little closer towards inferior conjunction when the effect should be greatest.

    I’m really a visual astronomer but sometimes I can’t resist the urge to snap a picture. The image here was taken by holding my iPhone (8 Plus) up to the eyepiece. I use the camera zoom to focus the telescope then zoom out a little and shoot bursts of images. I select the best shots, crop them, and adjust the exposure if necessary.

   We only get a couple of weeks every 19 months to observe Venus this way so I use every clear opportunity to make observations. The next inferior conjunction of Venus wont be until June 3, 2020 but Venus will be too close to the sun to view. In that case, I’ll observe Venus up until a few days before then wait a few days after the actual conjunction. My strict limit is 3-4 degrees away from the solar limb. As I said…perilous!

    I’d encourage you to try to see Venus this week. Have fun but please be careful!   RN 

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NGC 6818 – Planetary Nebula – Sagittarius – September 2018 – Observer’s Challenge Report #115

Posted October 12, 2018 by rogerivester
Categories: Observer's Challenge Reports

SEPTEMBER 2018 OBSERVERS CHALLENGE – NGC-6818

Pencil sketch from the eyepiece using a 5 x 8 blank notecard, and 6-inch f/6 reflector @ 129x

NGC 6818 Sketch

Pencil sketch averted color

Rogers NGC-6818 Inverted

 

Planetary Nebula IC 1295 In Scutum: August 2018 Observer’s Challenge Report

Posted September 20, 2018 by rogerivester
Categories: Observer's Challenge Reports

AUGUST 2018 OBSERVERS CHALLENGE – IC-1295-1

Image by Mario Motta from Massachusetts, using a 32-inch reflector

IC1295

Las Vegas Astronomical Society, Annual Observing Event at Cathedral Gorge, Nevada. Date: Thursday September 6th Thru The 9th 2018

Posted September 15, 2018 by rogerivester
Categories: Roger's Articles

Cathedral Gorge, Nevada, deep-sky observing site.  What a beautiful place!  

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Below:  Robert Sherman facing away, and standing beside John Heller’s 25-inch Obsession reflector.  Fred Rayworth’s 16-inch Meade in the center of the photo.  

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Christina Feliciano (R) and Cindi Heller to the left.

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Below:  Fred Rayworth. 

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Jay and Liz Thompson with the LVAS 24-inch club scope.  

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