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Astr112 Photography Projects, Spring 2006

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Galaxy M94 , AJ Myers M94

 

This is M94, an Sb spiral galaxy, like our own Milky Way, the big difference being that our galaxy has a bar. A galaxy is "a large semblance of stars, nebulae, and interstellar gas and dust (Freedman and Kaufman)." It was discovered on March 22, 1781 by Pierre Mechain. His friend, Charles Messier, found out about Mechain's discovery and catalogued it 2 days later. "Analysis of the spectrum of the starlight near the nucleus indicates that this is in a post-starburst phase, having undergone an intense burst of star formation almost a billion years ago which is now fading into the redder background of older giant stars (Keel)."

A color image found here which shows the blue star-forming areas in the spiral arms. It's large, bright nucleus give it it's Sb classification. It's distance is as yet unknown, but it is estimated by many astronomers to be anywhere from 14 million light years to 33 million light years.The angular size is about 3 arcminutes, and it's linear diameter is about 22,000 light years.

References:
Keel, Bill. http://www.astr.ua.edu/gifimages/m94.html.

Freedman, Roger A. and Kaufman, William J. III. Universe Stars and Glaxies.

National Optical Astronomy Observatory. http://www.noao.edu/outreach/aop/observers/m94.html.

Frommert, Hartmut and Kronberg, Christine. http://www.seds.org/Messier/m/m094.html

Right Ascension (J2000) 12:50:53.6
Declination (J2000) 41:07:10
Filters used clear(C)
Exposure time per filter 4x300 seconds in C
Date observed

March 7, 2006 (C)