M100 = NGC4321 ( 12h 22.9m +1549, 9.4 mag. )

This beautifully symmetrical face-on spiral galaxy in Coma Berenices was discovered by Mechain in 1781 and Messier saw it on April 13 same year. This is one of larger spiral galaxies in Virgo Cluster. It is about 55 million ly distant and measures 110,000 ly across. Some of its numerous sattelite galaxies are visible in the presented image. M100 is visible 155' NE of 6 Comae (see Virgo Cluster Map and the detailed chart below).

The above image was taken on May 4, 2002 from Harrowsmith, Ontario. Cookbook 245 LDC CCD camera was used on Celestron Ultima 8 f6.3 telescope autoguided with Cookbook 211 LDC CCD camera on piggybacked 500mm f8 telephoto lens. Ten white integrations (240 sec. each) were combined with cyan, magenta and yellow-filtered exposures (5 x 240 sec. each) using AIP4WIN.

North is to the left.

Map created in Guide 7.0 - 2 x 3. North is up.

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Jan Wisniewski