The
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. T ...
θ Orionis (Theta Orionis) is shared by several astronomical objects, located near
RA DEC :
*
θ1 Orionis (41 Orionis), the Trapezium Cluster, an open star cluster, the ''Orion OB Association 1d''
**
θ1 Orionis A (41 Orionis A, HD 37020, V1016 Orionis), a trinary star system
**
θ1 Orionis B (41 Orionis B, HD 37021), a quintet star system
*** θ
1 Orionis B West (COUP 766, MAX 97), an astronomical X-ray source
*** θ
1 Orionis B East (COUP 778, MAX 101), an astronomical X-ray source
**
θ1 Orionis C (41 Orionis C, HD 37022), a binary star system
**
θ1 Orionis D (41 Orionis D, HD 37023), a B0.5Vp variable star
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θ1 Orionis E (COUP 732), a spectroscopic binary star system
**
θ1 Orionis F, a B8 variable star at 11th magnitude
**
θ1 Orionis G (COUP 826, MAX 116), a young stellar object
**
θ1 Orionis H (COUP 746, MAX 87), a young stellar object
*
θ2 Orionis (43 Orionis)
** θ
2 Orionis A (43 Orionis, HD 37041), a spectroscopic trinary
** θ
2 Orionis B (HD 37042), a B1V variable star
** θ
2 Orionis C (HD 37062), a binary star system
The various components are spread over several
arc-minute
A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is of a turn. The nau ...
s in and near the
Orion Nebula
The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the Orion (constellation), constellation of Orion. It is one of the brightest nebulae and is visible to t ...
.
{{Set index article , astronomical objects
Orionis, Theta
Orion (constellation)