M 81 - Spiral Galaxy

Ursa Major

Click Image for Hi-Res Version

Spiral Galaxy

M81 - Galaxy in Ursa Major - North is to the Left
Date: Apr 25 2008 Time: 00:00 CST Location: Haltom City Tx
Instrument: 253mm F/9 Ritchey Chretien Mount: AP1200GTO Guiding: Internal Guider
Extra Hardware: None Seeing: Good Transparency: Fair
Camera: SBIG STL11K Filter Wheel: Internal Filter: AstroDon L
Exposure: 15 x 600 Seconds Camera Control: MaximDL 4.11 Processing: MaximDL,Sigma-Reject, PSCS
Image Center: RA 09h 56m 14s, Dec +69d 01m 56s, Pos Angle +272.7d'
Effective Focal Length 2286.7 mm ~ .82" per Pixel
Notes: Calm. Temp ~52 Degrees F. Guiding was ~ .7 arc second.