M104, Sombrero Galaxy

M104, Sombrero Galaxy 4/20/2015.

M104, Sombrero Galaxy 4/20/2015.

I was inspired to shoot this object with about twice the usual exposure by Scott Rosen of Astronomers Do It In the Dark.com. You can see his award winning image of the same object here.  Scott primarily uses the same Celestron C8 Schmidt–Cassegrain reflector telescope that I use and he seems to be well known in the amateur astro-photography world. So much for excuses. He has the same general equipment but also obviously possesses some processing skills and software I don’t have. But one other factor I noticed is that he gets in a lot of exposure time, usually two to four times as much as I have been getting. On this shot I got about six hours and tried for nine but, as Joni Mitchell might say, clouds got in the way.

I realized another technology step to make shooting life a little easier. Rather than traipsing back out during the shoot to see if all the tech goodies are properly functioning I started using TeamViewer on an iPad to stay on the couch and check on the PC running the show out in the driveway. Better to prolong a nap until shooting is completed.

The Sombrero Galaxy is a spiral galaxy with an unusual central bulge and a prominent dark dust lane, thus the sombrero moniker, and is known to have a super massive black hole at its center. The light that reached my little camera sensor is about 28 million years old. M104 is located in the constellation Virgo.

Stellarium chart

My M104 Sombrero image is a six hour and three minute exposure made up of 121 three minute subs. I used 20 flat, dark and bias frames.
• Lens: Celestron Orange Tube C8 Schmidt-Cassegrain, 8″ diameter, focal length 80.0″ (2032mm), f/10 with f/6.3 reducer
• Mount: Losmandy G11
• Autoguider: Orion Starshoot
• Guide-scope: ShortTube 80mm f/5.0 refractor telescope
• Camera: Gary-Honis full-spectrum modified Canon T1i (500D)
• White Balance: Daylight
• Mode: Raw
• ISO: 1600
• Location: Torrey, UT
• Date: 4/18-20/2015
• Guiding software: BackyardEOS, PHD Guiding
• Calibration: Deep Sky Stacker
• Processing: Photoshop CS5, Picasa

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