Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 4157
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NGC 4157 in Ursa Major., 



    
        

            astroeyes
NGC 4157 in Ursa Major.
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NGC 4157 in Ursa Major.

Getting plate-solving status, please wait...
NGC 4157 in Ursa Major., 



    
        

            astroeyes
NGC 4157 in Ursa Major.
Powered byPixInsight

NGC 4157 in Ursa Major.

Equipment

Imaging Telescopes Or Lenses
Orion Optics UK DX 250
Imaging Cameras
Starlight Xpress H9C
Mounts
Vixen GPDX w/ SS2K
Software
PixInsight · PHD · Astroart 3 · NEAT
Guiding Cameras
KWIQ Guider

Acquisition details

Dates:
April 7, 2011
Frames:
28x180" (1h 24')
Integration:
1h 24'
Avg. Moon age:
3.53 days
Avg. Moon phase:
13.45%

Basic astrometry details

Astrometry.net job: 227708

RA center: 12h11m10s.8

DEC center: +50°3003

Orientation: 170.528 degrees

Field radius: 0.263 degrees

Resolution: 1353x1003

Locations: Home, Weymouth, Dorset, UK, United Kingdom

Data source: Backyard

Description

There are some superb galaxies of all descriptions in and around Ursa Major which are perfectly placed for observation/imaging right now. Besides the obvious well known Messier galaxies there are a myriad of fascinating and relatively unknown galaxies which just cry out to be imaged.

Here, I present an image obtained a few days ago during a rare period of reasonable seeing. I normally use 120 sec subs guided using PHD and acquire a total exposure of between 60 and 120 minutes depending on the seeing, the relative faintness and size of the target and the degree of light pollution around at the time. On this ocassion I increased the sub exposure time to 180 seconds as the night was reasonable and the target quite bright.



The target was NGC 4157, a nearly edge-on spiral. It can be difficult to see the dust lanes in some edge-on galaxies and the spiral arms can be ill-defined but NGC 4157 has very easily seen dust lanes and it is not too difficult to pick out some of the spiral features.

The tiny little sliver just below 4157 is the 17th mag. PGC 213943 edge-on spiral, distance unknown but clearly immense.

Comments

Revisions

  • NGC 4157 in Ursa Major., 



    
        

            astroeyes
    Original
  • NGC 4157 in Ursa Major., 



    
        

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    B
  • Final
    NGC 4157 in Ursa Major., 



    
        

            astroeyes
    C

Sky plot

Sky plot

Histogram

NGC 4157 in Ursa Major., 



    
        

            astroeyes