HD 222109
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 37m 32.04280s[1] |
| Declination | +44° 25′ 44.3723″[1] |
| Apparent magnitude (V) | 5.80[2] (6.08 + 7.38)[3] |
| Characteristics | |
| Spectral type | B8V[4] |
| U−B color index | -0.32[2] |
| B−V color index | -0.06[2] |
| Astrometry | |
| Radial velocity (Rv) | −22.90±3.9[5] km/s |
| Proper motion (μ) | RA: 14.20±0.30[1] mas/yr Dec.: −17.63±0.45[1] mas/yr |
| Parallax (π) | 4.04 ± 0.52[1] mas |
| Distance | approx. 800 ly (approx. 250 pc) |
| Absolute magnitude (MV) | 5.753 |
| Details | |
| Surface gravity (log g) | 3.932±0.021[6] cgs |
| Temperature | 12,157±100[6] K |
| Rotational velocity (v sin i) | 158±13[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
HD 222109 is a binary star system in the northern constellation of Andromeda. The pair orbit each other with a period of 351.22 years, a typical separation of 0.41″, and an orbital eccentricity of 0.39.[3]
References
- 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 - 1 2 3 Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441−443, Bibcode:1984PASP...96..441G, doi:10.1086/131362
- 1 2 Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
- ↑ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 3 Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605−619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605
External links
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