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Sh2-171 / NGC7822

Classification: Emission Nebula NGC7822, Sh2-171, LBN 589
Constellation: Cepheus (CEP)
Object Location: Ra 00h 03m 48s Dec +67° 49’58” (current)
Size & Distance: 100 x 100 Apx 2900 light years

Date & Location: 11-5/6-2021 Little Blair Valley, CA
Exposure: Hubble Palette SHO 90,90,90. Sll,Ha,Olll 6ea @ 15min. (bin 1x1)
Optics: Telescope Engineering Company APO110FL w/ TEC FF @ f/5.74, 631mm, using the Optec FocusLynx.
Mount: Astro-Physics Mach 1 GTOCP4 / ATS 8x36 Pier.
Camera: FLI-PL16803 @-25c / FLI CFW5-7 / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 3nm Ha,Sll,Olll
Software: CCDStack, Photoshop CC,

Notes: Sky conditions: Average seeing, No wind, Temp 58-69
Image Field of view is 200x200 arcmin. North Up, Image Scale 2.94 arcsec/pix

NGC7822 or Sh2-171, as designated in the Sharpless Catalog of HII emission nebulae, is a star forming complex located in the constellation Cepheus A very young cluster of stars, designated Berkeley 59, is located in the upper center right of the image. This cluster is only a few million years old and is the primary ionizing source of illumination for the nebula. The Berkeley 59 cluster contains one of the hottest stars within a thousand parsecs from the Sun. It is an eclipsing binary containing an O5V star (BD+66 1673) with a surface temperature of almost 45,000 Kelvin. The bright star located in the center of the image (SAO 10956) is not associated with Sh2-171. It is a foreground star approximately 317 light years from the Earth. There is also a very small PLN near the top left designated as PLN 119+6.1