M91 = NGC4548 ( 12h 35.4m +14°30´, 10.2 mag. )
This large barred spiral galaxy in Virgo was discovered by Bode in 1774. Messier found "nebula without a star" above M90 on March 18, 1781 but wrote down inaccurate coordinates. It is now accepted that NGC4548 corresponds to 91st object on his list. M91 can be spotted 1°20' NNW of M90 (see Virgo Cluster Map and the detailed chart below). M88 is visible 49' W in the same low power field.
The above image was taken on December 20, 1998 from Sooke, BC. 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. Eight white integrations (240 sec. each) were processed with AIP4WIN.
North is to the right.
Map created in Guide 7.0 - 2° x 3°. North is up.
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© Jan Wisniewski