Michael Purcell's Astrophotography

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M66

M66

Although this picture of M66 did not turn out badly, it made me realize that a 5 minute exposure is not really enough time. The small pixel size of the ST-7, plus my use of a broadband light pollution filter, demand longer imaging times for even relatively bright objects such as M66.

It is worth repeating something I mentioned in my cover page. Many browsers (including Netscape) do not accurately convert the palette of some JPEG images. The severity of this problem depends on the color resolution of your display (i.e., Windows in 800x600x256 mode). Be sure to assign a good JPEG viewer as a "helper application" for your browser. Try downloading this image as a separate file, view it with a JPEG viewer, and compare with the image as shown by your browser. If they look the same, fantastic. Otherwise, use the helper application.

I took this picture from my driveway.

Constellation Leo
Right Asc (hh:mm:ss) 11:20:18
Declination(deg:sec) 13:00
Magnitude 9.2
Size (ArcMin) 8.7
Tirion SkyAtlas 2000 #13
Uranometria 2000 #191

CCD Camera Parameters

ST-7 Compressed Image
File_version = 3
Data_version = 1
Exposure = 5 minutes
Focal_length = 80.000
Aperture = 43.0000
Response_factor = 300.000
Note = Image taken 12/29/95 at 04:26:29
Background = 217
Range = 70
Height = 510
Width = 766
Date = 12/29/95
Time = 04:26:29
Exposure_state = 100
Temperature = -19.98 C
Number_exposures = 1
Each_exposure = 5 minutes
History = dEKF
Observer = Observer's Name
X_pixel_size = 0.0090
Y_pixel_size = 0.0090
Pedestal = 0
E_gain = 2.30
User_1 = CCDOPS for DOS Version 3.04
Filter = None
Readout_mode = 0
Track_time = 1000
Sat_level = 16383

This page last updated on September 6, 1996 Contact Michael Purcell

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