Dwarf Elliptical Galaxy in Cassiopiea

Uploaded 11/11/2001

A dwarf member of the Local Group of Galaxies, this small elliptical is actually an orbital companion to M31, the Great Andromeda Spiral. At a magnitude of 10.1 but a diameter of 12 x 10 arcmins, this object is bright, but spread out over a larger area making it difficult to image under less than transparent conditions. The field above is 14 arcmins wide. Close examination of this image shows a very granular appearance to the galaxies disk. This is the faint 20th+ magnitude stars in this object starting to resolve. There are several brown dusty specs in this object as well. They are huge dark nebula in the galaxy blotting out light from the stars behind them. About an inch and a half to the left of the galaxies core is a small diffuse yellow object, is FJJ NGC 185 VI, a globular cluster orbiting this galaxy.

Below: Comparison between My CCD image and the Palomar 200 inch shot

 Close up of the Luminosity frames (60mins) of the upper right corner of the image. Compare the limiting magnitude - about the same with the 200" shot on the right. My seeing is not nearly as good as Palomar, and was about 1.9" FMHW this night.  This image, from the Hubble Atlas of Galaxies is a deep exposure with the 200" at Mount Palomar shows the same field as left. A comparison shows that many of the faint 20th magnitude and fainter stars in this image are recorded in the image to the left.

Instrument:  12.5" f/5 Home made Newtonian
Platform:  Astrophysics 1200 QMD
CCD Camera:  SBIG ST7E w/Enhanced Cooling
Exposure:  LRGB = 60:20:20:36 (RGB Binned 2x2)
Filters:  RGB Tricolor
Location:  Payson, Arizona
Elevation:  5150 ft.
Sky:  Seeing FMHW = 1.9 arcsec, Transparency 7/10
Outside Temperature:  15 C
CCD Temperature:  -25 C
Processing:  Maxim DL, Photoshop, PW Pro.




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