by Anthony Ayiomamitis
NGC 7822 along with Ced 214 to its immediate south represent a large and expansive region of emission nebulosity on the border between Cepheus and Cassiopeia. NGC 7822 represents a region of active star formation and includes the young open cluster Berkeley 59 at the western tip of the nebula with many of the member stars estimated to be only a few million years-old. NGC 7822 lies at a distance of 2,600 to 3,300 light-years away and spans approximately 30 light-years and 90 arc-minutes in diameter (equivalent to three full moons) and another 20 arc-minutes high. The nebula is believed to be illuminated by one of the brightest stars closest to the sun known, namely BD+66 1673, and whose surface temperature is approximately 45,000 degrees Kelvin.
Technical Details:
Date: Sep 16-17, 2010 @ 21:05 - 03:30 UT+3 and Sept 17-18 @ 01:55 - 03:30 UT+3
Location: Athens, Greece (38.2997° N, 23.7430° E)
Equipment: Takahashi FSQ-106/f5, AP 1200GTO GEM, SBIG ST-10XME, SBIG CFW10, Baader 7nm H-α,SBIG LRGB filters
Integrations: HaRGB @ 240:60:60:60 using 6-/20-min subs, 1x1 binning, 2.65"/pixel, -15d C
Further details are available here.