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Astr110 Photography Projects, Spring 2005

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M-81, Jerry Hermanto


M-81 is one of the easiest galaxies to observe by an amateur observer. It is found in the northern constellation Ursa Major, which is nearest to our Local Group. M-81 is about 12,000, 000 ly away from Earth. It is one of the brightest and most visible galaxies. Hinting at a disorderly past, a remarkable dust lane runs straight through the disk, below and right of the galactic center. The errant dust lanes may be due to a close encounter between M-81 and its neighboring galaxy, M-82. M-81 also interacts weakly with a more distant neighbor, NGC 3077, showing that galaxy collisions happen in our own backyard. the distance of M-81 from one end to another is 38,000 light years.

Right Ascension (J2000) 03h 46m 05s
Declination (J2000) +24°23'02"
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter

60 seconds each in R,V,B,C

Date observed

March 9, 2005 (BVR), April 1, 2005 C)



Messier Object 81

M81 series of images

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