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| 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 |
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| 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, |
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| 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
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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
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