72 Orionis, a blue main-sequence star in Orion
72 Orionis is a blue main-sequence star in the constellation Orion. At 515 light years away, it shines at an apparent visual magnitude of 5.34.
72 Orionis (HIP 29704)
72 Orionis is a blue main-sequence star in the constellation Orion. At 515 light years away, it shines at an apparent visual magnitude of 5.34. It is moving through the Galaxy at a speed of 25.9 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,200 and 25,800 light years from the center of the Galaxy. It came closest to the Sun 5.5 million years ago when it had brightened to magnitude 3.30 from a distance of 201 light years.
Sky position: RA 6h 15.4m, Dec +16° 8.4'
Common designations: f-2 Orionis, 72 Orionis, HIP 29704, HD 43153
Brightest stars in Orion:
(list all)
| Rank | Mag. | Star |
| 58 | 5.21 | 60 Orionis |
| 59 | 5.24 | 45 Orionis |
| 60 | 5.26 | 52 Orionis |
| 61 | 5.32 | 38 Orionis |
| 62 | 5.33 | 5 Orionis |
| 63 | 5.33 | HR 1571 |
| 64 | 5.33 | 14 Orionis |
| 65 | 5.34 | 21 Orionis |
| 66 | 5.34 | HR 1861 |
67
| 5.34
) 72 Orionis
| Rank | Mag. | Star |
| 68 | 5.35 | HR 1519 |
| 69 | 5.36 | VV Orionis |
| 70 | 5.36 | 55 Orionis |
| 71 | 5.39 | HR 1507 |
| 72 | 5.39 | 75 Orionis |
| 73 | 5.43 | 16 Orionis |
| 74 | 5.44 | 73 Orionis |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of 72 Orionis
(compared to the Sun)
E
ccentricity: 3.1% vs. 16.0%Angle φ : -63.2°vs. 26.0°
Semi-major axis : 7,666 pc vs. 8,686 pc
Semi-minor axis: 7,662 pc vs. 8,574 pc
Focus-to-center
: 237 pcvs. 1,388 pcSemilatus rectum : 7,658 pc vs. 8,464 pc
Perigalacticon: 7,429 pc vs. 7,297 pc
Apogalacticon
: 7,903 pcvs. 10,074 pcSome Tabulated XHIP Data for 72 Orionis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 93.85469537° ±0.65 mas | 2.39 ±0.59 mas/yr. |
| Declination: | 16.14320601° ±0.34 mas | -13.28 ±0.37 mas/yr. |
| Galactic Longitude: | 194.50985976° | 12.82 mas/yr. |
| Galactic Latitude: | -0.40246843° | -4.23 mas/yr. |
Parallax: 6.24 ± 0.68 mas
Spectrography
Spectral Type: B7V 1972ApJ...175..453M.
Radial Velocity: 23.80 ±1.60 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
B
5.24
-0.75
V
5.34
-0.65
R
I
5.40
-0.60
J
5.49
-0.50
H
5.57
-0.42
K
5.60
-0.39
B-V: -0.10 V-I: -0.06
Derivations
Heliocentric distance: 158.00 pc (10.9% margin of error)
Galactocentric distance: 7,553 pc
Transverse velocity: 10.1 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -153.0 pc | -39.6 pc | -1.1 pc |
| Velocity (U, V, W) | -20.6 km/s | -15.3 km/s | -3.3 km/s |