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Nebula complex Sh2-115 (LBN 357), Sh2-116 (Abell 71 or PK 84+2.1 or PLN 85+4.1), LBN 362 and Berkeley 90 in Cygnus

New Ha-HaR-G-B combination (Click for a larger view 1800 x 1800 px)

 

Ha-HaR-G-B combination (Click for a larger view 1800 x 1800 px)

 

Ha-RGB combination (Click for a larger view 1800 x 1800 px)

 

Ha combination (Click for a larger view 1800 x 1800 px)

Details

Sh2-115 (LBN 357), Sh2-116 (Abell 71 or PK 84+2.1 or PLN 85+4.1), LBN 362 and Berkeley 90 in Cygnus

North is up in this image. This is a hydrogen emission complex catalogued as Sh2-115 and Sh2-116. Sh2-115 (LBN 357) is the lower brighter area. LBN 362 is the longer dimmer nebula in the upper part of the image. The little round ball in the upper right is a Sh2-116 (Abell 71 or PK 84+2.1 or PLN 85+4.1) - this object was first classified as a planetary nebula but recent studies show it to be an HII region instead. The open cluster below the center is called Berkeley 90.

These are really quite a faint objects and needs more integration time. The Horizontal FOV is about 100'. The image almost centered at:

Right Ascension 20:34:38 (h:m:s)
Declination +46:50:24 (deg:m:s)
Distance -
Brightness Fine to midrange
Apparent Dimension 100 x 70 (arc min)

Seeing: Pickering 8 rating - Good to Excellent
Optic(s): APO 90/600+WO field flatener @ f/4.9
Mount: CGE equatorial
Camera: Artemis Art 4021 monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics Ha, R, G, B set, SupaSlim Truetek Computerized Filter Wheel
Dates/Times: 2011-11-01
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

Ha = 200 min (1x1 binning), R = 20 min, G = 20 min, B = 20 min, (2x2 binning), Subexposures Ha = 10 min, RGB = 5 min, Total Exposure Time - 260 min

More details: Dark frames reduction
Guiding: Starlight Xpress Lodestar Autoguider on Celestron 11" Schmidt Cassegrain
Processing:

PixInsight / PS

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All Contents copyright Velimir Popov unless otherwise noted.