M100 (NGC 4321)
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Type Location r.a. dec. Size Magnitude Distance
Galaxy Coma B 12h22.9 15°49' 6.9' x 6.2' 9.4 55 Mly
 

Messier 100 (also known as NGC 4321) is an example of a grand design spiral galaxy located within the southern part of constellation Coma Berenices. It is one of the brightest and largest galaxies in the Virgo cluster, approximately 55 million light-years distant from Earth and has a diameter of 160,000 light years.

Several other galaxies are also visible, see finder chart below. NGC 4322 and NGC 4328 are connected to M100.

2006 Color image

Galaxy detail

2002 B&W images (with asteroid)

Full image (FOV = 35' x 23')

M100 detail

More from Wikipedia

Date Telescope Binning Exp Time (s) Special processing Notes
April 8, 2002 Centurion
18"
L 1:1 L 3x300 Max Entropy, (+DDP for galaxy detail) Asteroid detection: see below
April 9, 2006 " " L 3x300
R, G, B 300
Max entropy, LRGB, DDP  

The asteroid was detected by blinking between the 3 images. Here is an enlarged portion of the asteroid trace, just below IC 783:

The asteroid was easily identified on the Lowell Observatory web server which provided the following plot: