| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21 14 37.04960 |
| Declination | +00° 05′ 32.1167″ |
| Apparent magnitude (V) | 6.39 |
| Characteristics | |
| Spectral type | M1 III |
| U−B color index | +1.937 |
| B−V color index | +1.608 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | −123.5 km/s |
| Proper motion (μ) | RA: +35.74 mas/yr Dec.: –13.46 mas/yr |
| Parallax (π) | 3.45 ± 0.49 mas |
| Distance | approx. 900 ly (approx. 290 pc) |
| Other designations | |
| BD-00° 4186, HD 202259, HIP 104872, HR 8121, NSV 13614, SAO 145229. | |
| 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, 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, and is a red giant located along the asymptotic giant branch of the HR diagram. Located about 900 light years away, its radial velocity of −123.5 km/s indicates this is a high-velocity star.
References
- ^ 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, S2CID 18759600
- ^ Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C
- ^ Valdes, Francisco; et al. (June 2004), "The Indo-US Library of Coudé Feed Stellar Spectra", The Astrophysical Journal Supplement Series, 152 (2): 251–259, arXiv:astro-ph/0402435, Bibcode:2004ApJS..152..251V, doi:10.1086/386343, S2CID 119434884
- 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. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
- Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373
External links
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