Michael Purcell's Astrophotography

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M56

This globular cluster has the luminosity of about 90,000 Suns, and lies approx 46,000LY away. The ST-6 image is certainly not a recent one. But, I decided to reprocess it to see if I could improve earlier (unpublished) efforts. The resulting image is adequate. The only noteworthy aspect is that this represents the results of a 15 second exposure! (My ST-7 images are usually 10-15 minutes.)

I took this picture from my driveway.

Constellation Lyra
Right Asc (hh:mm:ss) 19:16:36
Declination(deg:sec) 30:11
Magnitude 8.2
Size (ArcMin) 7
Tirion SkyAtlas 2000 #8
Uranometria 2000 #118

CCD Camera Parameters

ST-6 Compressed Image
File_version = 3
Data_version = 1
Exposure = 15 seconds
Focal_length = 80.000
Aperture = 40.200
Response_factor = 1000.000
Note = M56, Globular Cluster in Lyra
Background = 730
Range = 112
Height = 242
Width = 375
Date = 05/09/93
Time = 02:49:09
Exposure_state = 228
Temperature = -20.05
Number_exposures = 1
Each_exposure = 15 seconds
History = RF
Observer = Michael Purcell
X_pixel_size = 0.0230
Y_pixel_size = 0.0270
Pedestal = 0
E_gain = 6.70

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

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