MESSIER INDEX - NGC INDEX - NAME INDEX
Date of observation: September 13, 1998
Time at end of first CCD image 00:19 PDT
Time at end of last CCD image 00:22 PDT
Observing Location: At home on the drive way
Observation of object: M39 is a very large irregularly open cluster with a few very bright stars.
Sky transparency: 5.6 - 4.9 high clouds at 1:00, (Magnitude of the faintest star visible with the unaided eye in Ursa Minor)
Moon rise at 23:52 PDT on September 12, 1998
Astronomical twilight ends in the evening at 21:07 PDT on September 12, 1998
Astronomical twilight starts in morning at 5:01 PDT on September 13, 1998
80 mm aperture refractor telescope and CCD Cookbook Camera
CCD image time: 8 - 15 seconds images added together
CCD dark calibration frames: 8 - 15 seconds dark frames
Notes: CB245 camera dew with water all over it. There may be water marks on the camera window on some of the images.
Use Test patterns to calibrate monitor brightness, contrast, height and width
© 1998-2003 David Haworth