Messier 57 - NGC 6720

"Ring Nebula"

• TYPE:  Planetary Nebula
• RA: 18h 53.6'
• DEC:  +33degrees 02'
• SIZE:  77"
• VISUAL MAGNITUDE:  8.8
• CENTRAL STAR:  15.29
• CONSTELLATION:  Lyra
• DISTANCE:  1,500  Light Years
• DIAMETER:  0.5 Light Years

IMAGING INFORMATION

• TELESCOPE:  RCOS 10 Carbon R/C, Ritchey-Chretien reflector, on Paramount GT1100 mount.
• REDUCER/CORRECTOR:  None - Operating at focal length of 9.0
• CAMERA:  Santa Barbara Instruments, ST-8XME Digital (Thermoelectrically cooled)
• ADAPTIVE OPTICS:  None
• FILTER(S):  Luminence, Red, Green, Blue (Astrodon)
• CCD COOLING TEMPERATURE:  -15 C
• BINNING/RESOLUTION:  1 X 1 (1530 X 1020) L - 2 X 2 (765 X 510 resized to 1530 X 1020) RGB
• EXPOSURE TIME:  L = 10 -  5 minute subframes, RGB 10 - 3 minute subframes (each color)   (2 hours, 20 minutes total)
• NUMBER OF IMAGES:  40
• FILM SPEED:  N/A
• DATE/TIME:  05-24-2006
• LOCATION:  Valley Center, San Diego County, California
• TEMPERATURE:  61 Degrees
• HUMIDITY:  34 Percent

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