HD 39901

Last updated
HD 39901
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 53m 22.85088s [1]
Declination −42° 55′ 16.7853″ [1]
Apparent magnitude  (V)6.54±0.01 [2]
Characteristics
Spectral type K3 III [3]
B−V color index +1.37 [4]
Astrometry
Radial velocity (Rv)−10.3±0.4 [5] km/s
Proper motion (μ)RA: +5.109 mas/yr [1]
Dec.: +11.405 mas/yr [1]
Parallax (π)5.1076±0.0152  mas [1]
Distance 639 ± 2  ly
(195.8 ± 0.6  pc)
Absolute magnitude  (MV)−0.03 [6]
Details
Mass 1.27 [7]   M☉
Radius 21.9 [8]   R☉
Luminosity 143±1 [9]   L☉
Surface gravity (log g)1.87 [7]   cgs
Temperature 4,373±122 [10]   K
Metallicity [Fe/H]+0.08 [11]   dex
Rotational velocity (v sin i)<1.6 [12]  km/s
Other designations
59 G. Columbae [13] , CD−42°2205, CPD−42°769, GC 7431, HD 39901, HIP 27835, HR 2069, SAO 217599 [14]
Database references
SIMBAD data

HD 39901 is an orange hued star located in the constellation Columba. It is also called HR 2069, which is the star's Bright Star Catalog designation. Eggen (1989) lists it as a member of the old disk population. [11]

Despite the HR designation, the object has an apparent magnitude of 6.54, [2] slightly past the limit for the naked eye visibility. As a result, it is barely visible to the unaided eye in the best conditions. Parallax measurements from the Gaia spacecraft place the object 639 light years away. [1] It is approaching the Solar System with a heliocentric radial velocity of −10.3  km/s . [5] At that distance, HD 39901's brightness is diminished by 0.33 magnitudes due to interstellar dust. [15] It has an absolute magnitude of −0.03. [6]

This is an evolved red giant star with a stellar classification of K3 III. [3] It has a comparable mass to the Sun [7] but has expanded to 21.9 times the latter's girth. [8] It radiates 143 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 4,373 K. [10] HD 39901 is slightly enriched in heavy elements with a metallicity 120% that of the Sun's. [11] Like most giants, it spins slowly, having a projected rotational velocity lower than 1.6  km/s . [12]

References

  1. 1 2 3 4 5 6 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.
  2. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "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. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41°. Bibcode:1978mcts.book.....H.
  4. ↑ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode:1971MNSSA..30...37C. ISSN   0024-8266.
  5. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  6. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  7. 1 2 3 Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi: 10.1051/0004-6361/202142369 . eISSN   1432-0746. ISSN   0004-6361.
  8. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 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.
  10. 1 2 Stassun, Keivan G.; et al. (9 September 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 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  11. 1 2 3 Eggen, Olin J. (April 1989). "Large and kinematically unbiased samples of G- and K-type stars. IV - Evolved stars of the old disk population". Publications of the Astronomical Society of the Pacific. 101: 366. Bibcode:1989PASP..101..366E. doi: 10.1086/132442 . eISSN   1538-3873. ISSN   0004-6280.
  12. 1 2 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". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361.
  13. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  14. ↑ "HD 39901". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2011-12-20.
  15. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711.
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