HD 39901

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HD 39901
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Columba
Right ascension 05h 53m 22.85122s[1]
Declination −42° 55′ 16.7849″[1]
Apparent magnitude (V) 6.55[2]
Characteristics
Spectral type K3III[3]
B−V color index 1.370±0.001[2]
Astrometry
Radial velocity (Rv)−9.54±0.15[1] km/s
Proper motion (μ) RA: +5.109[1] mas/yr
Dec.: +11.405[1] mas/yr
Parallax (π)5.0507 ± 0.0224[1] mas
Distance646 ± 3 ly
(198.0 ± 0.9 pc)
Absolute magnitude (MV)−0.03[2]
Details
Mass1.25[4] M☉
Radius20.80+0.93
−1.99[1] R☉
Luminosity142.6±1.1[1] L☉
Surface gravity (log g)1.808[4] cgs
Temperature4,374+225
−95[1] K
Metallicity [Fe/H]0.04[4] dex
Rotational velocity (v sin i)<1.6[5] km/s
Other designations
CD−42°2205, GC 7431, HD 39901, HIP 27835, HR 2069, SAO 217599[6]
Database references
SIMBADdata

HD 39901(HR 2069) is an orange giant in the constellation of Columba. With an apparent magnitude of 6.561, it is only visible when there is almost no light pollution. This star is currently located 646 light-years away from the Solar System, but is drifting closer with a radial velocity of -9.54 km/s. If it were placed exactly 10 parsecs (32 light years), it would be at an apparent magnitude of -0.03.

Properties[]

HD 39901 has a stellar classification of "K3III", which means it's a K-type star that has exhausted hydrogen at its core. It has only 1.25 times the mass of the Sun but has expanded to almost 21 times the latter's girth. It radiates at 142.6 solar luminosities, and has an effective temperature of 4,374 K, which gives it an orange-hue. HD 33901 has a weaker surface gravity compared to other stars, and has a similar metallicity to the Sun, but is slightly enriched in heavy elements.

References[]

  1. ^ a b c d e f g h i 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. ^ 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, S2CID 119257644.
  3. ^ Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ a b c Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M; Minchev, I.; de Jong, R. S.; Antoja, T; Ramos, P. (August 2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy & Astrophysics, 628: 25, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765, S2CID 131780028
  5. ^ De Medeiros, J. R.; Alves, S.; Udry, S; Andersen, J; Nordström, B.; Mayor, M. (January 2014), "A catalog of rotational and radial velocities for evolved stars. V. Southern stars", Astronomy & Astrophysics, 561: 27, arXiv:1312.3474, Bibcode:2014A&A...561A.126D, doi:10.1051/0004-6361/201220762, S2CID 54046583
  6. ^ "HD 39901". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-12-20.
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