SH2-171 (NGC7822 and CED 214) in HST* Palette (Kirk)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7762 · NGC 7822

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SH2-171 (NGC7822 and CED 214) in HST* Palette

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SH2-171 (NGC7822 and CED 214) in HST* Palette

In this photo two nebulae are show, the brighter one, on the right is CED 214, while the area to the left is known as NGC7822. The two structures known as emission nebulae are so closely entangled that is difficult to see where one begins and the other ends and there are many dark nebulae between them. The entire structure which is referred to as Sharpless 171 (SH2-171) is located in the constellation Cepheus on the border between Cepheus/Cassiopeia and is also populated by many young hot stars that cause the entire area to glow. This exposure of over 7.8 hours reveals the details using the HST palette which is accomplished by combining sub frames using three narrowband filters that capture light produced by glowing hydrogen (Ha), oxygen (OIII) and sulfur (SII) present in the nebula. Green is assigned to hydrogen, blue to oxygen and red to the sulfur.

Distance from earth is approximately 3000 light years.

Acquisition Date: Between 9/15/2012 and 9/22/2012

Camera: SBIG ST8300M @ -12°C

Telescope: Canon 200mm F2.8 L ULTRASONIC Lens

Mount: Losmandy G11 with Gemini II

Guidescope: ATLE80 80mm at f/4.8

Guide Camera: Orion SSAG with Televue TRF2008 0.8x reducer

Filters:

-Hydrogen Alpha (Ha): 10 x 15min (150min)

-Oxygen III (OIII): 12 x 15min (180min)

-Sulfur II (SII): 7 x 20min (140min)

Total Exposure: 470min (7.83 hours)

Limiting Magnitude: 5.1

Comments:

Processed in Pixinsight 1.7 and Adobe Photoshop CS5

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Status	Basic success
Started	...
Astrometry.net job	3516653
PixInsight job	n/a
PixInsight queue size	n/a
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SH2-171 (NGC7822 and CED 214) in HST* Palette

SH2-171 (NGC7822 and CED 214) in HST* Palette

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SH2-171 (NGC7822 and CED 214) in HST* Palette

SH2-171 (NGC7822 and CED 214) in HST* Palette

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