The Great Nebula in Orion: M42 (NGC 1976, LBN 974, Messier 42) and M43 (NGC 1982, Messier 43, de Mairan's Nebula)

1800 px

© Velimir Popov & Emil Ivanov 2020

The Great Nebula in Orion is an immense, nearby starbirth region. The Orion Nebula spans about 40 light years and is located about 1500 light years away in the same spiral arm of our Galaxy as the Sun.

The Orion Nebula contains a very young open cluster The Trapezium or Orion Trapezium Cluster, also known by its Bayer designation of Theta1 Orionis. In normal observing conditions can be resolved four stars but two of these stars are binary systems giving a total of six stars to the asterism.

The stars of the Trapezium, along with many other stars, are still in their early years. The Trapezium is a component of the much larger Orion Nebula Cluster, an association of about 2800 stars within a diameter of 20 light years.


Image details:

Charts and image details obtained from


Center of field RA 05:35:17.5 (h:m:s)
Center of field DE -05:23:53.8 (deg:m:s)
Size 35.6 x 35.6 (arcmin)
Pixel scale: 1.04 (arcsec/pixel)
Optic(s): RC” Astrograph @ f/5
Mount: ASA DDM85 Premium
Camera: ATIK 4000 M
Filters: Astronomik Ha, L, R, G, B Astronomik filters
Dates/Times: LRGB taken on 5.02.2013
Ha taken on 8.01.2014
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: Ha: 45 x 5 sec; Ha: 50 x 30 sec; Ha: 17 x 300 sec; Ha: 6 x 600 sec;
LRGB: 10:10:10:10 x 1 sec
LRGB: 3:3:3:3 x 300 sec
  Total exp. time 210 min (3.5 hrs)
More details: Bias, dark, and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2020. All Rights Reserved
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