S Monocerotis
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 40m 58.6607s[1] |
| Declination | +09° 53′ 44.715″[1] |
| Apparent magnitude (V) | 4.66 |
| Characteristics | |
| Spectral type | O7Ve[2] |
| U−B color index | -1.034[3] |
| B−V color index | -0.261[3] |
| Astrometry | |
| Radial velocity (Rv) | 33.2[4] km/s |
| Proper motion (μ) | RA: –0.66[1] mas/yr Dec.: –2.51[1] mas/yr |
| Parallax (π) | 3.19 ± 0.73[1] mas |
| Distance | approx. 1000 ly (approx. 310 pc) |
| Details | |
| Rotational velocity (v sin i) | 120[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
S Monocerotis, also known as 15 Monocerotis, is a massive variable star system located in the constellation Monoceros.[6] It is a spectroscopic binary system with an orbital period of 25 years.[7] It is a type O giant with a stellar classification of O7Ve, and is about 8,500 times as luminous as the Sun, which varies in between magnitude 4.2 and 4.6. The star lies at the base of the Christmas Tree Cluster in NGC 2264.
[edit] References
- ^ a b c d e Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode 1997A&A...323L..49P.
- ^ a b "HD 47839 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=S+Monocerotis. Retrieved 2010-06-10.
- ^ a b Oja, T. (August 1985). "Photoelectric photometry of stars near the north Galactic pole. II". Astronomy and Astrophysics Supplement Series 61: 331–339. Bibcode 1985A&AS...61..331O.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode 1953QB901.W495......
- ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1). Bibcode 1970CoAsi.239....1B.
- ^ Heather Couper and Nigel Henbest (1999). Space Encyclopedia. Verona, Italy: Dorling Kindersley. p. 175. ISBN 0-7894-4708-8.
- ^ Gies, Douglas (July 2004). The Masses of the O-type Binary 15 Monocerotis. HST Proposal ID #10107. Bibcode 2004hst..prop10107G.
[edit] External links
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