NGC 7023 (VdB 139, Iris Nebula) in Cepheus

  Size: 1800 px      
© Velimir Popov & Emil Ivanov 2011 - 2017

NGC 7023 (also catalogued as VDB 139, Ced 187, DG 167, LBN 487, LBN 104.08+14.21, Bernes 39, Magakian 846, V380 Cep, Caldwell 4, Iris Nebula, IV 74, GC 4634) is a reflection nebula in the constellation Cepheus. It reflects the light of some nearby stars; probably the main star responsible for its lighting is the 7 mag. star HD 200775, which would be enveloped by the nebula, along with other less bright stars born from its dust. The nebula is about 1400 light years from us and its dimensions in space are about 6 l.y. It is probably part of the vast molecular nebulous complex of Cepheus.

Image details:


Center of field RA 21:01:14 (h:m:s)
Center of field DE +68:00:38 (deg:m:s)
Size 1.47 x 1.06 (deg)
Pixel scale: 1.03 (arcsec/pixel)
Orientation: Up is 96.7 degrees E of N
Charts and image details obtained from
Optic(s): ASA 12" Astrograph @ f/3.6 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: 23, 29 Aug 2011
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:14x10min., R:6x10 min, G:6x10 min, B:6x10 min, Bin 1, Total Exposure Time - 320 min (6:40h).
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2017. All Rights Reserved
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