MESSIER INDEX - NGC INDEX - NAME INDEX
Date of observation: August 21, 1998
Time at end of CCD image 21:11 PDT
Observing Location: ARGO
Observation of object: M4 is a large irregular globular cluster with some stars resolved to half way to center and it has a small irregular bright core.
Sky transparency: 5.3 (Magnitude of the faintest star visible with the unaided eye in Ursa Minor) The Milky Way was very bright with dust lanes.
Moon set at 19:52 PDT on August 21, 1998
Astronomical twilight ends in the evening at 21:45 PDT on August 21, 1998
Astronomical twilight starts in morning at 4:28 PDT on August 22, 1998
80 mm aperture refractor telescope and CCD Cookbook Camera
CCD image time: 1 - 60 seconds image
CCD dark calibration frames: 15 - 60 seconds dark frames
Use Test patterns to calibrate monitor brightness, contrast, height and width
© 1998-2003 David Haworth