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NGC 6820 (Sh 2-86, LBN 135) and NGC 6823 - mixed emission and reflection nebula, associated with open cluster in Vulpecula

Color mix H-HSO, HHOO (Click for a larger view 1400 x 1400 px)

 

Ha - 110 min (Click for a larger view 1400 x 1400 px)

Details

NGC 6820 (Sh 2-86, LBN 135) and NGC 6823 - mixed emission and reflection nebula, associated with open cluster in Vulpecula

NGC 6820 is an emission nebula that surrounds open cluster NGC 6823 in Vulpecula, very close to M27, the Dumbbell Nebula. The nebula NGC 6820 is also called Sh 2-86. This is an exceedingly dim area of hydrogen gas that was discovered in 1864. Dispersed among the surrounding nebulosity is a host of dark clouds, elephant trunk like pillars, and several Bok globules. Bok Globules represent collapsing protostellar cores of gas and dust with diameters of about 10000 astronomical units. The cores will ultimately evolve to form infant stars.

(the text adapted from Robert Gendler's short article)

North is up. The Horizontal FOV is about 25' (slight crop). The image almost centered at:

Right Ascension 19 : 42.5 (h:m)
Declination +23 : 05.3 (deg:m)
Distance 8.150 (kly)
Brightness - (mag)
Apparent Dimension

- (arc min)

Seeing: Pickering 7 rating - Good
Optic(s): RC 12" with Astro-Physics corrector @ f/5.4
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik Ha, OIII, SII set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-07-22
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

Ha = 110 min, OIII = 70 min, SII = 50 min, subs. 10 min, Bin 1, Total Exposure Time - 230 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided thanks to ASA DDM85 Premium mount
Processing:

PixInsight / PS

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All Contents copyright Velimir Popov unless otherwise noted.