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Wildrik Botjes Planetarium
Physics & Astronomy Department

Astr110 Photography Projects, Spring 2010

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m109 Spiral Galaxy, Yohan Na

This Messier 109 is known as one of the "Theta" - like barred spirals. The bar is identified by the line going through the center dot of light. It was first observed by Pierre Mechain on March 12,1781 and then by Charels Messier on March 24, 1781. There was some confusion in the recording with M108 and M97, so its name was changed to 109, but because of the confusion, it was not added to the official Messier catalog until 1953 by Owen Gingerich.

Looking at the image above, the galaxy doesn't have much gradation of colors. Mostly a yellow tone. The red and the green dots around the bright dots may have occurred during the calliberation of the filtered images. The angular size is about 5.7arcmintues by 3.7arcminitues, and it is about 55million light years in distance. The linear size of this galaxy is about 91thousand light years by 59thousand light years.

References:

http://seds.org/messier/m/m109.html

http://en.wikipedia.org/wiki/Messier_109

http://en.wikipedia.org/wiki/Barred_spiral_galaxy

Right Ascension (J2000) 11:57:54
Declination (J2000) +53:24:24
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 5x60 seconds in CBVR
Date observed

March 2, 2010 (C)
March 2, 2010 (BVR)