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HD 39901 - Wikipedia

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HD 39901
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	05^h 53^m 22.85088^s^[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 (R_v)	−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 (M_V)	−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

^ ^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.
^ ^a ^b 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.
^ ^a ^b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41°. Bibcode:1978mcts.book.....H.
^ 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b ^c 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b ^c 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.
^ ^a ^b 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.
^ 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.
^ "HD 39901". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-12-20.
^ 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.

Constellation of Columba

Stars

Bayer	α (Phact) β (Wazn) γ δ ε η θ (Elkurud) κ λ (Tsze) μ ν¹ ν² ξ ο π¹ π² σ
Variable	WZ AF AP
HR	1721 1758 1835 1877 1958 2069 2082 2131 2149 2263 2288 2399 2411 2445 2446
HD	43848
Other	NGTS-1 NGTS-3 WASP-63

Exoplanets	NGTS-1b NGTS-3Ab NGTS-4b WASP-63b

Star clusters	NGC 1851

Galaxies

NGC	1792 1808 1989 1992 2090
Other	ESO 306-17 PKS 0521-365