NGC 3992 - M109
Object: NGC 3992 galaxy in Ursa Major, 9.8m, 7'x4', type SBc, distance 16.9 Mpc (55 Mly)
Taken on 2006/05/05 with a C11 at f/6.5 and ST7EI (1"/pixel) on a G11 with Gemini
Autoguided via a SX716 on a Taurus Tracker III OAG.
Seeing was bad to mediocre (FWHM ~4").
Total exposure 70 x 1min (~1h) using SD Mask combine.
Subimages were calibrated with bias, dark and flat field frames. Flats are camera only, no OTA. No other processing was done.