Astronomy:HD 202259
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Short description: Star in the constellation Aquarius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | 21h 14m 37.04896s[2] |
| Declination | +00° 05′ 32.1202″[2] |
| Apparent magnitude (V) | 6.39[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M1 III[5] |
| U−B color index | +1.937[3] |
| B−V color index | +1.608[3] |
| Variable type | Suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | −123.5[5] km/s |
| Proper motion (μ) | RA: +35.471[2] mas/yr Dec.: −13.260[2] mas/yr |
| Parallax (π) | 3.4472 ± 0.0290[2] mas |
| Distance | 946 ± 8 ly (290 ± 2 pc) |
| Absolute magnitude (MV) | −0.88[1] |
| Details | |
| Mass | 1.9[7] M☉ |
| Radius | 50[8] R☉ |
| Luminosity | 693[1] L☉ |
| Surface gravity (log g) | 1.68[7] cgs |
| Temperature | 3,933[7] K |
| Metallicity [Fe/H] | −0.23[7] dex |
| 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, 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 946 light years away, its radial velocity of −123.5 km/s indicates this is a high-velocity star.[9]
References
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 Cousins, A. W. J. (1984). "Standardization of Broadband Photometry of Equatorial Standards". South African Astronomical Observatory Circulars 8: 59. Bibcode: 1984SAAOC...8...59C.
- ↑ Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ 5.0 5.1 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.
- ↑ 7.0 7.1 7.2 7.3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 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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