Archive for the ‘Observer’s Challenge Reports’ category

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

October 29, 2018

More information to come….please check back.  

Concerning 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  

2169290_2_NGC147

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

2169290_3_NGC185

Observing notes and 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 

image001

 

image002

 

 

 

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

October 26, 2018

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

 

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

October 12, 2018

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

September 20, 2018

AUGUST 2018 OBSERVERS CHALLENGE – IC-1295-1

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

IC1295

Messier 4 – Globular Cluster in Scorpius – July 2018 Observer’s Challenge Report

August 24, 2018

Click on the following link for the complete report:  

JULY 2018 OBSERVERS CHALLENGE – M-004

Notes from my backyard:

Globular cluster, M4 is easy to see with a 60 mm refractor, appearing as a faint circular glow at low magnification.  When using a 3.5-inch Maksutov-Cassegrain at 78x, there is a resolve of some of the brighter members.  The cluster has a subtle elongated shape.  A very faint chain of stars was noted in the central region, oriented N-S.  With 102 mm refractor, there is a greater number of stars resolved within the cluster, and much greater concentration of stars, elongated and with more stars in the central chain. A prominent double star is located on the SE edge.   

10-inch reflector at 140x, excellent resolve of the cluster. The center chain of stars is very bright and with many stars counted, both in the central region and around the outer edges.  A chain of stars makes an arc, the entire length of the cluster on the NW side.  The elongation shape becomes much more apparent with the larger aperture.      Roger Ivester 

Pencil sketch with the colors inverted using a 102 mm refractor @ 140x 

Rogers M-004 Inverted

 

 

M51 and Companion Galaxy NGC 5195 – June 2018 Observer’s Challenge Report

July 12, 2018

JUNE 2018 OBSERVERS CHALLENGE – M-051

Observing notes: 

Messier 51 is visible along with companion NGC-5195 in a 60mm (2.4-inch) refractor.  M51 was mostly round with a bright stellar nucleus and a very faint halo.  The small companion galaxy, NGC-5195, just to the north was very faint and small.  If sky conditions are poor, this galaxy pair can be extremely difficult to see using a telescope this small.

In a 10-inch reflector on an exceptional night at 190X, spiral structure was easily visible.  I could trace the prominent eastern arm almost in contact with companion galaxy, NGC-5195.  The nuclei of both NGC-5194 and NGC-5195 were both stellar, with the smaller galaxy, 5195, having a brighter, more intense nuclei.  M51 had a mag. 13.5 star a couple of minutes to the SW of the core, still within the halo, and a mag. 14 star, (requiring averted vision to see) just off to the east, but outside of the halo.

One of my most memorable views of NGC-5194 and NGC-5195 came during an early spring night in 1993, using a 14.5-inch reflector.  The connecting arm of M51 (NGC-5194) was incredible and it reached far out toward the companion galaxy to the north.  This view rivaled that of many photographs.

On the night of April 14, 1994, supernova 1994I was visible.  I estimated the mag. of the SN on that night at 13.8.  The following pencil sketch was made that night. 

 

Rogers M-051 New a Inverted
 

Epsilon Bootis – Double Star – W. Struve’s “The Most Beautiful One”

June 19, 2018

Observer’s Challenge object for June 2019:  

Epsilon Bootis:  Called “Pulcherrima” or “the most beautiful one” by Struve.

At one time, observing double stars was the most popular facet of amateur astronomy, however, I think we can all agree, this is not the case as of current.  Sad indeed!   I say….fortunate indeed is the amateur who discovers the joy of observing double stars.

Nothing is more beautiful than a close pair with vivid and contrasting colors, such as Epsilon Bootis.

Want to have some fun tonight?  You don’t have to be concerned with the brightening moon, or ambient lighting, but take a look and try the very challenging double star Epsilon Bootis.

Good seeing is definitely required to see the companion of Epsilon.  On many nights with less than good seeing, I’ve failed to see the companion, even with a 102 mm refractor, or a 10-inch reflector with an effective aperture of 4-inches, using an off-axis stop-down mask.  

It is an unequal double with the primary being magnitude 2.37 and the secondary at 5.12, with a separation of 2.9″ which makes this double difficult for many observers.

I see the colors as a beautiful yellow and a vivid blue, with a clean separation at 175x using a 102 mm refractor.

Quoting from Celestial Harvest by James Mullaney:

! Izar, Magnificently-tinted but tight pair. “Most beautiful yellow, superb blue.” Rather difficult in apertures under 4-inches.  A 3-inch at 150x shows two beautifully-colored diffraction disk nearly in contact!  ….called “Pulcherrima” or “the most beautiful one” by Struve.  JM

Many have seen the companion with a 3-inch, and from Webb, even a 2-inch, however, for me, it’s always been at least 4-inches of aperture.  What will be the smallest telescope which will allow you to see the companion?

After all….every amateur should attempt to see a double star called “the most beautiful one.”

Roger Ivester