Cederblad 214 and NGC 7822 Hubble Palette
NASA's Astronomy Picture of the Day, November 11, 2016

NGC 7822
All Images Copyright Steve Cannistra

NASA's Astronomy Picture of the Day, November 11, 2016
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RA: 00h 02m 38s (J2000)
Dec: +67degrees 41' 58" (J2000)
PA: +64 degrees (Pinpoint)

Note:  In this image, South is to the left, and North is to the right.  This is a narrowband image in which SII is mapped to RED, HII is mapped to GREEN, and OIII is mapped to BLUE (i.e., the Hubble Palette).

Cederblad 214 (Ced214) is a large emission nebula in the constellation Cepheus.   The brighter portion of the nebula is located to the left of center in the image (South) and is associated with more intense OIII emission (blue).  This region is referred to as Ced214, Sharpless 171 (SH2-171), or sometimes NGC7822, depending upon the source.  However, there is some naming confusion over this, with some using the designation NGC7822 only to refer to the fainter portion of the nebula located on the right hand side of the image (North)

Within Ced214 there are
many regions of "elephant trunk" structures created as a result of gas being blown away by UV radiation from one of the brightest UV sources in the nebula, the star BD+66 1673, located almost in the center of this field (J2000 coordinates for BD+66 1673 are RA 00 01 47; Dec +67 30 25).  This star is contained within a cluster of about 40 hot, short-lived OB stars known as the Berkeley 59 complex (Be59), located in the general center of this field. As can be appreciated by the "donut hole" in the central part of this complex, gas in this star-forming region is being cleared out by the young, newly formed stars of the Berkeley 59 complex, which emit strong UV radiation, reminiscent of similar nebulae such as IC1396 and the Rosette.  More information about this interesting region may be found on Rob Gendler's webpage, and on the APOD website.   Please check out the other links above for alternate views of this region.

Photographic Details:
Dates:  August 20, 22, 23, 24, 2016
Scope:  Takahashi FSQ106 at f5 on the Takahashi NJP Mount
Autoguider:  SBIG ST-402 with 60mm guidescope, focal length 227mm
Camera:  Apogee U16M at -20C, with 7 position 50mm square filter wheel (Apogee FW50-7S)
Baader Ha, OIII, and SII narrowband filters; Baader RGB filters (for providing more realistic star color)
Exposures:  Total exposure 26 hours
Post-processing:  Calibrated, aligned and stacked in Maxim, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS (16 bit format) using the clipped layer mask method originally described by Travis Rector.  Star colors obtained from RGB data

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