Messier M57

Messier Object Information
Messier object: M57 Common name for Messier object: Ring Nebula NGC (New General Catalog) number: NGC 6720 Discription: Planetary Nebula Located in constellation: Lyra Right ascension in hours minutes: 18:53.6 Declination in degrees minutes: 33:02	Visual magnitude: 8.8 Size: 1.4 x 1.0 arc minutes Image size: 31 arc minutes high by 41 arc minutes wide Image orientation: North is right, West is bottom, East is top and South is left Image orientation: North is top, East is left Detailed discription of M57 in SEDS Messier database Other Messier galleries, images or catalogs

Observing Log
Date of observation: September 23, 2000
Time at end of first CCD image 21:53 PDT
Time at end of last CCD image 21:58 PDT
Observing Location: At home on the drive way
Observation of object: M57 is a small ring shape planetary nebula in the center of the above image. M57 is located at the northern edge of the Milky Way which provides a rich backgound of stars.

Sky Conditions
Moon rise at 2:57 PDT on September 24, 1998
Astronomical twilight ends in the evening at 20:46 PDT on September 23, 1998
Astronomical twilight starts in morning at 5:19 PDT on September 24, 1998

Observing Equipment

Fastar
Celestron C-8 Schmidt-Cassegrain telescope with Fastar lens accessory and SBIG ST-237 CCD Camera
CCD image time: 9 - 30 seconds images stacked together
CCD dark calibration frame: 84 - 30 seconds dark frames
CCD bias calibration frame: 40 - 0 seconds bias frames
CCD flat calibration frame: 8 - 30 seconds flats frames at twilight (5:48 PDT)

M57 image taken with Orion ShortTube 80 mm refractor telescope and Cookbook CB245 CCD Camera.

Use Test patterns to calibrate monitor brightness, contrast, height and width

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