S Orionis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Orion |
| Right ascension | 05h 29m 00.8948s[1] |
| Declination | -04° 41′ 32.748″[1] |
| Apparent magnitude (V) | 9.20[1] |
| Characteristics | |
| Spectral type | M7e |
| U-B color index | +0.15[1] |
| B-V color index | +1.73[1] |
| Variable type | Mira variable |
| Astrometry | |
| Proper motion (μ) | RA: 14.77 mas/yr Dec.: -10.87 mas/yr |
| Parallax (π) | 0.32 ± 2.56 mas |
| Distance | approx. 10000 ly (approx. 3000 pc) |
| Details | |
| Radius | 400—500 R☉ |
| Other designations | |
S Orionis is a red giant star in the constellation Orion. It is a Mira variable that pulsates with a 420–day cycle, and varies in radius from 1.9 to 2.3 astronomical units.[2]
[edit] References
- ^ a b c d e f SIMBAD query result: V* S Ori -- Emission-line Star. Centre de Données astronomiques de Strasbourg. Retrieved on 2007-06-15.
- ^ "Chronicle of a Death Foretold", ESO, May 31, 2007. Retrieved on 2007-06-15.
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