HD 201647

Last updated
HD 201647
Microscopium constellation map.svg
Red circle.svg
Location of HD 201647 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 12m 13.71281s [1]
Declination −40° 16′ 09.7010″ [1]
Apparent magnitude  (V)5.83 [2] (5.83 - 5.86) [3]
Characteristics
Spectral type F5 V [4] [5]
B−V color index +0.45 [2]
Variable type suspected [3]
Astrometry
Radial velocity (Rv)4.5±0.9 [6]  km/s
Proper motion (μ)RA: +58.359  mas/yr [1]
Dec.: −218.773  mas/yr [1]
Parallax (π)31.4586 ± 0.0401  mas [1]
Distance 103.7 ± 0.1  ly
(31.79 ± 0.04  pc)
Absolute magnitude  (MV)+3.33 [7]
Details
Mass 1.28 [8]   M☉
Radius 1.47+0.07
−0.04 [9]   R☉
Luminosity 3.79±0.01 [1]   L☉
Surface gravity (log g)4.21±0.01 [10]   cgs
Temperature 6,637±80 [11]   K
Metallicity [Fe/H]+0.06±0.01 [12]   dex
Rotational velocity (v sin i)25.1±2.5 [13]  km/s
Age 916 [8]   Myr
Other designations
55 G. Microscopii [14] , NSV  25506, CD−40°14216, CPD−40°9488, GC  29614, GJ  9726, HD  201647, HIP  104680, HR  8100, SAO  230575, LTT  8410, TIC  159670453 [15]
Database references
SIMBAD data

HD 201647 (HR 8100; Gliese 9726; LTT 8410) is a solitary star [16] located in the southern constellation Microscopium. It is faintly visible to the naked eye as a yellowish-white-hued star with an apparent magnitude of 5.83. [2] The object is located relatively close at a distance of light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 4.5  km/s . [6] At its current distance, HD 201647's brightness is diminished by 0.11 magnitudes due to interstellar extinction [17] and it has an absolute magnitude of +3.33. [7] It has a relatively high proper motion across the celestial sphere, moving at a rate of 226.331 mas/yr. [18]

HD 201647 has a stellar classification of F5 V, [5] [4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 1.28 times the mass of the Sun [8] and 1.47 times the radius of the Sun. [9] It radiates 3.79 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,637  K . [11] HD 201647 is slightly metal enriched with an iron abundance of [Fe/H] = +0.06 or 115% of the Sun's. [12] It is estimated to be 916 million years old [8] and it spins modestly with a projected rotational velocity of 25.1  km/s . [13]

In the discovery paper for Lacaille 8760, HD 201647 was reported to be a variable star that varied between 5.83 and 5.86 in the visual passband. [3] As of 2004 however, it has not been confirmed to be variable. [19]

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References

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  8. 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146 . eISSN   1538-4357. S2CID   33401607.
  9. 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.
  10. ↑ Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002 . Bibcode:1999A&A...352..555A. ISSN   0004-6361. S2CID   13365201.
  11. 1 2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv: 1103.4651 . Bibcode:2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276 . eISSN   1432-0746. ISSN   0004-6361. S2CID   56118016.
  12. 1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv: 1705.00883 . Bibcode:2017MNRAS.469.3042N. doi: 10.1093/mnras/stx1077 . eISSN   1365-2966. ISSN   0035-8711. S2CID   119034918.
  13. 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 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.
  14. ↑ 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.
  15. ↑ "HD 201647". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 14, 2023.
  16. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  17. ↑ 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.
  18. ↑ Knapp, Wilfried; Nanson, John (January 2019). "A Catalog of High Proper Motion Stars in the Southern Sky (HPMS3 Catalog)". Journal of Double Star Observations. 15: 21–41. Bibcode:2019JDSO...15...21K.
  19. ↑ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode:2004yCat.2250....0S.
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