Messier M101


Object Information
Messier object: M101
Common name for Messier object: Pinwheel Galaxy
NGC (New General Catalog) number: NGC 5457
Discription: Spiral Galaxy
Located in constellation: Ursa Major
Right ascension in hours minutes: 14:03.2
Declination in degrees minutes: 54:21
Visual magnitude: 7.9
Size: 22.0 arc minutes
Image size: 55.23 arc minutes high by 40.98 arc minutes wide
Image orientation: North is top, East is left
Detailed discription of M101 in SEDS Messier database
Other Messier galleries, images or catalogs

Observing Log
Date of observation: September 12, 1998
Time at end of first CCD image 21:39 PDT
Time at end of last CCD image 21:57 PDT
Observing Location: At home on the drive way
Observation of object:
Sky Conditions
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
Observing Equipment
80 mm aperture refractor telescope and CCD Cookbook Camera
CCD image time: Five 240 seconds images added together
CCD dark calibration frames: 20 - 240 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