Theta-2 Orionis, a blue main-sequence star in Orion
Theta-2 Orionis is a blue main-sequence star in the constellation Orion. At 1,581 light years away, it shines at an apparent visual magnitude of 4.98.
Theta-2 Orionis (HIP 26235)
Theta-2 Orionis is a blue main-sequence star in the constellation Orion. At 1,581 light years away, it shines at an apparent visual magnitude of 4.98. Theta-2 Orionis is a component of a multiple-star system. It is moving through the Galaxy at a speed of 41.8 km/s relative to the Sun and is part of the NGC 1981 and Orion Nebula moving groups.
Sky position: RA 5h 35.4m, Dec -5° 25.2'
Common designations: Theta-2 Orionis, 43 Orionis, HIP 26235, HD 37041
Brightest stars in Orion:
(list all)
| Rank | Mag. | Star |
| 40 | 4.77 | 49 Orionis |
| 41 | 4.78 | HR 1887 |
| 42 | 4.81 | 15 Orionis |
| 43 | 4.89 | 25 Orionis |
| 44 | 4.90 | 51 Orionis |
| 45 | 4.91 | Lalande 12104 |
| 46 | 4.95 | HR 1952 |
| 47 | 4.95 | 69 Orionis |
| 48 | 4.98 | Theta-1 Orionis |
49
| 4.98
) Theta-2 Orionis
| Rank | Mag. | Star |
| 50 | 4.99 | 23 Orionis |
| 51 | 5.04 | 74 Orionis |
| 52 | 5.07 | 27 Orionis |
| 53 | 5.13 | Theta-1 Orionis C |
| 54 | 5.14 | 64 Orionis |
| 55 | 5.18 | 6 Orionis |
| 56 | 5.18 | HR 1684 |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Theta-2 Orionis
(compared to the Sun)
E
ccentricity: 10.2% vs. 16.0%Angle φ : -65.3°vs. 26.0°
Semi-major axis : 8,222 pc vs. 8,686 pc
Semi-minor axis: 8,179 pc vs. 8,574 pc
Focus-to-center
: 837 pcvs. 1,388 pcSemilatus rectum : 8,137 pc vs. 8,464 pc
Perigalacticon: 7,385 pc vs. 7,297 pc
Apogalacticon
: 9,060 pcvs. 10,074 pcSome Tabulated XHIP Data for Theta-2 Orionis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 83.84541587° ±0.31 mas | 3.70 ±0.80 mas/yr. |
| Declination: | -5.41606364° ±0.24 mas | 4.00 ±0.80 mas/yr. |
| Galactic Longitude: | 209.04846771° | -1.89 mas/yr. |
| Galactic Latitude: | -19.37217078° | 5.11 mas/yr. |
Parallax: 2.11 ± 0.41 mas
Spectrography
Spectral Type: B2Ve 1987ATsir1517....1A.
Radial Velocity:
39.90 ±2.90 km/s [A rating]
2004A&A...424..727P.
This star is a spectroscopic binary with a solved orbit.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
4.08
-4.35
B
4.88
-3.55
V
4.98
-3.45
R
I
4.87
-3.56
J
H
K
B-V: -0.10 V-I: +0.11
Derivations
Heliocentric distance: 484.86 pc (fitted to cluster)
Galactocentric distance: 7,804 pc
Transverse velocity: 12.5 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -399.9 pc | -222.1 pc | -160.8 pc |
| Velocity (U, V, W) | -38.4 km/s | -16.4 km/s | -2.2 km/s |