HD 201852

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HD 201852
Location of HD 201852 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 13m 18.96155s[1]
Declination −36° 25′ 24.7016″[1]
Apparent magnitude (V) 5.95±0.01[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.74[4]
B−V color index +0.98[4]
Astrometry
Radial velocity (Rv)0.4±0.4[5] km/s
Proper motion (μ) RA: +33.411 mas/yr[1]
Dec.: +3.122 mas/yr[1]
Parallax (π)8.9286 ± 0.038 mas[1]
Distance365 ± 2 ly
(112.0 ± 0.5 pc)
Absolute magnitude (MV)+0.73[6]
Details
Mass1.87[7] M☉
Radius9.89±0.50[8] R☉
Luminosity58.0±0.5[1] L☉
Surface gravity (log g)2.80±0.08[9] cgs
Temperature4,984±34[10] K
Metallicity [Fe/H]−0.02±0.03[11] dex
Rotational velocity (v sin i)<1.0[12] km/s
Age1.58[7] Gyr
Other designations
57 G. Microscopii[13], CD−36°14676, CPD−36°9343, GC 29648, HD 201852, HIP 104752, HR 8108, SAO 212800, TIC 159690250[14]
Database references
SIMBADdata

HD 201852 (HR 8108; 57 G. Microscopii) is a solitary star located in the southern constellation Microscopium. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.95.[2] Gaia DR3 parallax measurements imply a distance of 365 light-years[1] and it is slowly receding with a heliocentric radial velocity of 0.4 km/s.[5] At its current distance, HD 201852's brightness is diminished by an interstellar extinction of 0.11 magnitudes[15] and it has an absolute magnitude of +0.73.[6]

HD 201852 has a stellar classification of K0 III,[3] indicating that it is an evolved K-type giant that has exhausted hydrogen at its core and left the main sequence. It has 1.87 times the mass of the Sun but at the age of 1.58 billion years,[7] it has expanded to 9.89 times the radius of the Sun.[8] It radiates 58 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,984 K.[10] HD 201852 has a near solar metallicity at [Fe/H] = −0.02[11] and it spins too slowly for its projected rotational velocity to be measured accurately; it has been given an upper limit of 1 km/s.[12] Based on its kinematics and elemental abundances, HD 201852 is said to be part of the thin disk population.[16]

References[edit]

  1. ^ a b c d e f g 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. ^ 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. S2CID 17128864.
  3. ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode:1982mcts.book.....H.
  4. ^ a b Oja, T. (1970). "UBV-Fotometri danska Tel (ESO)". Private Communication: 0. Bibcode:1970Priv.........0O.
  5. ^ 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.
  6. ^ 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.
  7. ^ a b c Bertelli, G.; Bressan, A.; Chiosi, C.; Fagotto, F.; Nasi, E. (August 1994). "Theoretical isochrones from models with new radiative opacities". Astronomy and Astrophysics Supplement Series. 106: 275–302. Bibcode:1994A&AS..106..275B. ISSN 0365-0138. S2CID 122757475.
  8. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  9. ^ Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. eISSN 1432-0746. ISSN 0004-6361. S2CID 245440163.
  10. ^ a b Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN 1538-3881. ISSN 0004-6256. S2CID 118505114.
  11. ^ a b Alves, S.; Benamati, L.; Santos, N. C.; Adibekyan, V. Zh.; Sousa, S. G.; Israelian, G.; De Medeiros, J. R.; Lovis, C.; Udry, S. (11 April 2015). "Determination of the spectroscopic stellar parameters for 257 field giant stars★". Monthly Notices of the Royal Astronomical Society. 448 (3): 2749–2765. arXiv:1503.02556. Bibcode:2015MNRAS.448.2749A. doi:10.1093/mnras/stv189. ISSN 0035-8711.
  12. ^ 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 V: Southern 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. S2CID 54046583.
  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 201852". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 20, 2023.
  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. S2CID 118879856.
  16. ^ Adibekyan, V. Zh.; Benamati, L.; Santos, N. C.; Alves, S.; Lovis, C.; Udry, S.; Israelian, G.; Sousa, S. G.; Tsantaki, M.; Mortier, A.; Sozzetti, A.; De Medeiros, J. R. (April 29, 2015). "Chemical abundances and kinematics of 257 G-, K-type field giants. Setting a base for further analysis of giant-planet properties orbiting evolved stars★". Monthly Notices of the Royal Astronomical Society. 450 (2). Oxford University Press (OUP): 1900–1915. arXiv:1503.08346. Bibcode:2015MNRAS.450.1900A. doi:10.1093/mnras/stv716. ISSN 1365-2966. S2CID 58920318.
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