Cosmic Impressions by Glenn Schaeffer

M104 - The Sombrero Galaxy


Full Frame

M104 cropped

Cropped Image


The Sombrero Galaxy, also known as M104 or NGC 4594, is and unbarred spiral galaxy in the constellation Virgo.  It has a bright nucleus, a large central bulge, and my favorite visually, a prominent dust lane.  The dark dust lane and bulge give this galaxy the appearance of a sombrero. At 9.0 magnitude, this galaxy is one, if not my favorite galaxy to observe through my 20" Obsession telescope visually.

This was my first trip to Fort McKavett that I was not haunted by winds. (At least Friday night)  I was able to obtain suitable 64 subframes out of 74.

Photographic Details:

Date & Location: April 4th, 2008, Fort Mckavett, Texas.
Scope: Obsession 20” f/5 on a Tom Osypowski Dual Axis Equatorial Platform, Orion 100mm f/6 Guidescope.
Autoguider: SC1 Mod Celestron Neximage Cam, Shoestring GPUSB guide port interface adapter, and Guidemaster software
Camera: Canon 20D DSLR (non-modded), homemade serial control shutter release cable and DSLR shutter from Stark Labs.
Filters: None
Conditions: Temp 49F, Humidity 29%, Winds calm, Transparency 9/10, Seeing 7/10.
Exposures: 64 x 60sec @ 3200 ISO Sub Frames, 10 Darks average combined for master dark.
Post-processing: 3504x2336 Raw files converted to Lossless 16-bit FITS, calibrated, aligned, and combined with ImagePlus software. Final processing PhotoImpact Pro.


Images Copyright 1999-2010 by Glenn Schaeffer