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HD 202259

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HD 202259
Observation data
Epoch J2000      Equinox J2000
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 mas[2]
Distance946 ± 8 ly
(290 ± 2 pc)
Absolute magnitude (MV)−0.88[1]
Details
Mass1.9[7] M☉
Radius50[8] R☉
Luminosity693[1] L☉
Surface gravity (log g)1.68[7] cgs
Temperature3,933[7] K
Metallicity [Fe/H]−0.23[7] dex
Other designations
BD−00°4186, HD 202259, HIP 104872, HR 8121, NSV 13614, SAO 145229.
Database references
SIMBADdata
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

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  1. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c Cousins, A. W. J. (1984). "Standardization of Broadband Photometry of Equatorial Standards". South African Astronomical Observatory Circulars. 8: 59. Bibcode:1984SAAOC...8...59C.
  4. ^ Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  5. ^ a b 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.
  6. ^ 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. ^ a b c d Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  8. ^ Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  9. ^ 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.
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