Eta Orionis
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 24m 28.6s (may be inaccurate) |
| Declination | −02° 23' 49.7" (May be inaccurate) |
| Apparent magnitude (V) | 3.38 |
| Characteristics | |
| Spectral type | B0.5V |
| U-B color index | 1.22 |
| B-V color index | −0.17 |
| Variable type | Beta Lyrae variable |
| Astrometry | |
| Radial velocity (Rv) | 19.8 km/s |
| Proper motion (μ) | RA: −0.54 mas/yr Dec.: −3.21 mas/yr |
| Parallax (π) | 3.62 ± 0.88 mas |
| Distance | ~900 (700–1200) ly (~280 (220–360) pc) |
| Absolute magnitude (MV) | −3.8 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Orionis (η Ori) is a star system at a distance of 900 light years from Earth and part of the Orion Arm. Eta Orionis is part of the constellation of Orion and lies a little to the west of Orion's belt between Delta Orionis and Rigel, being closer to Delta Orionis than to Rigel. It is an eclipsing binary system consisting of two blue stars orbiting one another in a regular pattern.
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