Celestial hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  Great Orion Nebula  ·  IC 420  ·  Lower Sword  ·  M 42  ·  M 43  ·  Mairan's Nebula  ·  NGC 1973  ·  NGC 1975  ·  NGC 1976  ·  NGC 1977  ·  NGC 1980  ·  NGC 1981  ·  NGC 1982  ·  Orion Nebula  ·  The star 42Ori  ·  The star 45Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri  ·  Upper Sword  ·  the Running Man Nebula
M42 Orion Nebula H-alpha, Padraic Moran
M42 Orion Nebula H-alpha
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M42 Orion Nebula H-alpha

M42 Orion Nebula H-alpha, Padraic Moran
M42 Orion Nebula H-alpha
Powered byPixInsight

M42 Orion Nebula H-alpha

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Description

Capture of M42 Orion Nebula in the H-alpha band.

There are a number of double and multiple star systems in Messier 42. Most famous are the Trapezium itself (Struve 748), and Theta 1 and 2 Orionis (Struve A16 and A17).

NGC 1980 is a separate area of nebulosity which comprises 10 stars, including four multiple star systems:

- Struve 752 Iota Orionis Aa (Hatysa) and Ab (spectrographic binary only - not visually separable), B and C

- Struve 747 with two components A and B

- Struve 745 with three components A, B and C

- Struve 754 with two components A and B, which at 5" separation, are not separable at 400m focal length.

All were discovered by Friedrich Georg Wilhelm von Struve (1793-1864), the prodigious Russian double star hunter.

The star systems in NGC 1980 are annotated in an enlarged section of this image here:

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M42 Orion Nebula H-alpha, Padraic Moran