Astronomy:HD 202259
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Short description: Star in the constellation Aquarius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 14m 37.04960s[1] |
| Declination | +00° 05′ 32.1167″[1] |
| Apparent magnitude (V) | 6.39[2] |
| Characteristics | |
| Spectral type | M1 III[3] |
| U−B color index | +1.937[2] |
| B−V color index | +1.608[2] |
| Variable type | Suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | −123.5[3] km/s |
| Proper motion (μ) | RA: +35.74[1] mas/yr Dec.: –13.46[1] mas/yr |
| Parallax (π) | 3.45 ± 0.49[1] mas |
| Distance | approx. 900 ly (approx. 290 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
HD 202259 is a suspected variable star in the equatorial constellation of Aquarius. With an apparent magnitude of 6.39,[2] according to the Bortle scale it is faintly visible to the naked eye from dark rural skies. It has a stellar classification of M1 III,[3] and is a red giant located along the asymptotic giant branch of the HR diagram.[5] Located about 900 light years away,[1] its radial velocity of −123.5 km/s[3] indicates this is a high-velocity star.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 2.3 Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars 8: 59, Bibcode: 1984SAAOC...8...59C
- ↑ 3.0 3.1 3.2 3.3 Valdes, Francisco et al. (June 2004), "The Indo-US Library of Coudé Feed Stellar Spectra", The Astrophysical Journal Supplement Series 152 (2): 251–259, doi:10.1086/386343, Bibcode: 2004ApJS..152..251V
- ↑ Kazarovets, E. V. et al. (December 1998), "New Catalogue of Suspected Variable Stars. Supplement - Version 1.0", Information Bulletin on Variable Stars 4655 (1): 1, Bibcode: 1998IBVS.4655....1K
- ↑ Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245–266, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K
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