Michael Purcell's Astrophotography

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M81

Messier 81 is a nearly face-on spiral galaxy located near M82 in Ursa Major. In 1993 a supernova occured in one of its spiral arms. In this image, it is the middle of the three dim stars just to the lower right of the nucleus of the galaxy.

I took this picture from my driveway.

Constellation	Ursa Major
Right Asc (hh:mm:ss)	9:55:36
Declination(deg:sec)	69:04
Magnitude	6.9
Size (ArcMin)	25.7
Tirion SkyAtlas 2000	#2
Uranometria 2000	#23

CCD Camera Parameters

ST-6 Compressed Image
File_version = 3
Data_version = 1
Exposure = 15 minutes
Focal_length = 80.000
Aperture = 40.200
Response_factor = 1000.000
Note = M81, Spiral Galaxy in Ursa Major
Background = 800
Range = 4096
Height = 229
Width = 328
Date = 12/12/93
Time = 01:55:35
Exposure_state = 228
Temperature = -50.05 C
Number_exposures = 45
Each_exposure = 20 seconds
History = RF
Observer = Michael Purcell
X_pixel_size = 0.0230
Y_pixel_size = 0.0270
Pedestal = 9113
E_gain = 6.70

This page last updated on June 14, 1998 Contact Michael Purcell