HD 77887

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HD 77887
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Volans
Right ascension 09h 01m 08.514s[1]
Declination −68° 41′ 02.11″[1]
Apparent magnitude (V) 5.87±0.01[2]
Characteristics
Evolutionary stage AGB[citation needed]
Spectral type M1III[3]
Variable type Slow irregular variable[3]
Astrometry
Radial velocity (Rv)13.66±0.17[1] km/s
Proper motion (μ) RA: +16.467±0.151[1] mas/yr
Dec.: −0.300±0.149[1] mas/yr
Parallax (π)4.4276 ± 0.0810[1] mas
Distance740 ± 10 ly
(226 ± 4 pc)
Absolute magnitude (MV)−0.78[4]
Details
Mass1.16[5] M☉
Radius52.03[6] R☉
Luminosity600[6] L☉
Surface gravity (log g)0.94[5] cgs
Temperature3959[6] K
Metallicity [Fe/H]0.12[5] dex
Other designations
HD 77887, CPD−68°879, GSC 09195-03211, HIP 44283, HR 3610, IRAS 09005-6829, 2MASS J09010850-6841017, NSV 18118, PPM 357073, SAO 250421, TYC 9195-3211-1
Database references
SIMBADdata

HD 77887 (HR 3610) is a giant star located around 700 light years away from Earth in the constellation Volans. With an apparent magnitude of 5.87, it's barely visible to the naked eye. HD 77887 has a radial velocity of 13.66 km/s, which means it is drifting away from the Solar System, and is currently located 740 light years away from Earth.

Properties[]

This star has a spectral classification of "M1III". This means it is an M-type star that has exhausted hydrogen in its core and evolved away from the main sequence. HD 77887 has a similar mass to the Sun, but has expanded to over 50 times the Sun's girth. It radiates at about 600 solar luminosities, and has an effective temperature of 3959 K, which gives it a red-hue. Due to its enlarged size, HD 77887 has a weaker surface gravity than most stars, and has a similar metallicity to the Sun.

Variability[]

HD 77887 is suspected to be a slow irregular variable star with an amplitude of about a tenth of a magnitude.[3]

References[]

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. ^ Anderson, E.; Francis, Ch. (2012-05-01). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
  5. ^ a b c Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  6. ^ a b c Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Bailer-Jones, C. A. L.; Biermann, M.; Evans, D. W.; Eyer, L.; Jansen, F. (2018-08-01). "Gaia Data Release 2. Summary of the contents and survey properties". Astronomy and Astrophysics. 616: A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. ISSN 0004-6361. S2CID 49211658.
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