Pi-4 Orionis, a blue giant star in Orion
Pi-4 Orionis is a blue giant star in the constellation Orion. At 1,047 light years away, it is the 349th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.68.
Pi-4 Orionis (HIP 22549)
Pi-4 Orionis is a blue giant star in the constellation Orion. At 1,047 light years away, it is the 349th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.68. The iron abundance of Pi-4 Orionis is -0.31 (49.0% of the Sun). It is moving through the Galaxy at a speed of 23.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 25,000 and 35,400 light years from the center of the Galaxy.
Sky position: RA 4h 51.2m, Dec +5° 36.6'
Common designations: Pi-4 Orionis, 3 Orionis, HIP 22549, HD 30836
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Brightest stars in Orion:
(list all)
| Rank | Mag. | Star |
| 4 | 1.69 | Alnilam |
| 5 | 1.74 | Alnitak |
| 6 | 2.07 | Saiph |
| 7 | 2.25 | Mintaka |
| 8 | 2.75 | Hatsya |
| 9 | 3.19 | Tabit |
| 10 | 3.35 | Eta Orionis |
| 11 | 3.39 | Heka |
| 12 | 3.59 | Tau Orionis |
13
| 3.68
) Pi-4 Orionis
| Rank | Mag. | Star |
| 14 | 3.71 | Pi-5 Orionis |
| 15 | 3.77 | Sigma Orionis |
| 16 | 4.06 | Omicron-2 Orionis |
| 17 | 4.09 | Phi-2 Orionis |
| 18 | 4.12 | Mu Orionis |
| 19 | 4.13 | 29 Orionis |
| 20 | 4.20 | A Orionis |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Pi-4 Orionis
(compared to the Sun)
E
ccentricity: 17.2% vs. 16.0%Angle φ : -8.7°vs. 26.0°
Semi-major axis : 9,274 pc vs. 8,686 pc
Semi-minor axis: 9,135 pc vs. 8,574 pc
Focus-to-center
: 1,599 pcvs. 1,388 pcSemilatus rectum : 8,998 pc vs. 8,464 pc
Perigalacticon: 7,675 pc vs. 7,297 pc
Apogalacticon
: 10,873 pcvs. 10,074 pcSome Tabulated XHIP Data for Pi-4 Orionis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 72.80152507° ±0.16 mas | -2.29 ±0.21 mas/yr. |
| Declination: | 5.60510135° ±0.10 mas | 0.85 ±0.12 mas/yr. |
| Galactic Longitude: | 192.89030696° | -1.95 mas/yr. |
| Galactic Latitude: | -23.52226701° | -1.47 mas/yr. |
Parallax: 3.10 ± 0.18 mas
Spectrography
Spectral Type: B2III 1978rmsa.book.....M.
Radial Velocity:
23.30 ±4.10 km/s [D rating]
2006AstL...32..759G.
This star is a spectroscopic binary with an unsolved orbit.
Iron Abundance [Fe/H]:
-0.31 dex
1992ApJ...387..673G.
Photometry
| band | magnitude | Abs. Mag. |
| U | 2.70 | -4.83 |
| B | 3.52 | -4.01 |
| V | 3.68 | -3.85 |
| R | ||
| I | 3.81 | -3.72 |
| J | 4.11 | -3.42 |
| H | 4.15 | -3.38 |
| K | 4.13 | -3.40 |
B-V: -0.16 V-I: -0.13
Derivations
Heliocentric distance: 321.28 pc (5.8% margin of error)
Galactocentric distance: 7,688 pc
Transverse velocity: 3.7 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -287.2 pc | -65.7 pc | -128.2 pc |
| Velocity (U, V, W) | -20.6 km/s | -1.7 km/s | -11.3 km/s |