Michael Purcell's Astrophotography

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NGC4565

(Click on the picture above to go to the main image.)

The odd integration time for this image was a result of being forced to use a suboptimal guide star in order to properly center this large galaxy within the CCD chip. A 5 minute test image had shown that I was cutting off one of the spiral arms of the galaxy. Near the end of the planned 15 minute exposure the ST-7 lost the guide star and ended the image.

I took this picture in New Mexico.

Constellation	Coma Berenices
Right Asc (hh:mm:ss)	12:36:18
Declination(deg:sec)	25:59
Magnitude	9.6
Size (ArcMin)	16x3
Tirion SkyAtlas 2000	#7
Uranometria 2000	#149

CCD Camera Parameters

ST-7 Compressed Image
File_version = 3
Data_version = 1
Exposure = 13 minutes 23 seconds
Focal_length = 63.000
Aperture = 65.9000
Response_factor = 2000.000
Note = Image taken 04/16/96 at 22:23:41
Background = 244
Range = 281
Height = 510
Width = 765
Date = 04/16/96
Time = 22:23:41
Exposure_state = 100
Temperature = -14.81 C
Number_exposures = 1
Each_exposure = 13 minutes 23 seconds
History = dKEF
Observer = Michael Purcell
X_pixel_size = 0.0090
Y_pixel_size = 0.0090
Pedestal = 0
E_gain = 2.30
User_1 = CCDOPS for DOS Version 3.50B4
Filter = Clear
Readout_mode = 0
Track_time = 900
Sat_level = 16383

This page last updated on Aug 18, 1996 Contact Michael Purcell