HD 200779

Last updated
HD 200779
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 05m 19.74605s [1]
Declination +07° 04′ 09.4729″ [1]
Apparent magnitude  (V)8.27 [2]
Characteristics
Spectral type K6 V [3]
U−B color index +1.12 [4]
B−V color index +1.21 [4]
R−I color index +0.61 [2]
Astrometry
Radial velocity (Rv)−66.94±0.18 [5]  km/s
Proper motion (μ)RA: +78.562  mas/yr [1]
Dec.: −563.909  mas/yr [1]
Parallax (π)66.4626 ± 0.0225  mas [1]
Distance 49.07 ± 0.02  ly
(15.046 ± 0.005  pc)
Absolute magnitude  (MV)+7.38 [6]
Details
Mass 0.68±0.01 [7]   M☉
Radius 0.689+0.077
−0.050 [8]   R☉
Luminosity 0.18 [9]   L☉
Surface gravity (log g)4.67±0.02 [7]   cgs
Temperature 4,406±73 [10]   K
Metallicity [Fe/H]+0.05±0.06 [7]   dex
Rotational velocity (v sin i)5.1±1.2 [5]  km/s
Age 6.33 [11]   Gyr
Other designations
AG+06°2882, BD+06°4741, GC  29447, GJ  818, HD  200779, HIP  104092, SAO  126533, CCDM J21054+0704A, WDS J21053+0704A, LFT  160, LHS  3624, LTT  16169 [12]
Database references
SIMBAD data
ARICNS data

HD 200779 (HIP 104092; Gliese 818; LHS 3624) is a solitary star located in the equatorial constellation Equuleus, the foal. It has an apparent magnitude of 8.27, [2] making it readily visible in binoculars but not to the naked eye. The object is located relatively close at a distance of 49 light years based on Gaia DR3 parallax measurements, [1] which makes it the nearest star in Equuleus. [13] It is classified as a high proper motion star, [12] with a total proper motion of 569  mas /yr. [1]

At its current distance, HD 200779's brightness is diminished by only six hundredths of a magnitude due to interstellar dust [14] and it has an absolute magnitude of +7.38. [6] HD 200779 is expected to come within 7.76 parsecs (25.3 ly) of the Solar System in roughly 160,000 years. [15]

HD 200779 is an ordinary K-type main-sequence star with a stellar classification of K6 V. [3] It has 68% the mass of the Sun [7] and 69% of its radius. [8] However, it only radiates 18% the luminosity of the Sun [9] from its photosphere at an effective temperature of 4,406  K , [10] giving it an orange hue. It has an iron abundance slightly above solar level at [Fe/H] = +0.05 [7] and it is estimated to be 6.33 billion years old. [11] HD 200779 spins modestly with a projected rotational velocity of 5.1  km/s . [5] The star is generally considered to be chromospherically active. [3]

HD 200779 has two optical companions: a distant 11th magnitude star located 64.6" away and a 9th magnitude star located 169.4" away. [16]

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<span class="mw-page-title-main">HD 24479</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">2 Piscis Austrini</span> Star in the constellation Microscopium

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">HD 204018</span> Visual binary in Microscopium

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References

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  7. 1 2 3 4 5 Ramírez, I.; Fish, J. R.; Lambert, D. L.; Allende Prieto, C. (13 August 2012). "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets". The Astrophysical Journal. 756 (1): 46. arXiv: 1207.0499 . Bibcode:2012ApJ...756...46R. doi: 10.1088/0004-637X/756/1/46 . eISSN   1538-4357. ISSN   0004-637X. S2CID   119199829.
  8. 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.
  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 Luck, R. Earle (13 February 2018). "Abundances in the Local Region. III. Southern F, G, and K Dwarfs". The Astronomical Journal. 155 (3): 111. Bibcode:2018AJ....155..111L. doi: 10.3847/1538-3881/aaa9b5 . eISSN   1538-3881. S2CID   125765376.
  11. 1 2 Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series. 178 (1): 89–101. arXiv: 0804.4473 . Bibcode:2008ApJS..178...89D. doi: 10.1086/589654 . eISSN   1538-4365. ISSN   0067-0049. S2CID   119290835.
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  13. ↑ Kirkpatrick, J. Davy; Marocco, Federico; Gelino, Christopher R.; Raghu, Yadukrishna; Faherty, Jacqueline K.; Bardalez Gagliuffi, Daniella C.; Schurr, Steven D.; Apps, Kevin; Schneider, Adam C.; Meisner, Aaron M.; Kuchner, Marc J.; Caselden, Dan; Smart, R. L.; Casewell, S. L.; Raddi, Roberto (2024-04-01). "The Initial Mass Function Based on the Full-sky 20 pc Census of ∼3600 Stars and Brown Dwarfs". The Astrophysical Journal Supplement Series. 271 (2): 55. arXiv: 2312.03639 . Bibcode:2024ApJS..271...55K. doi: 10.3847/1538-4365/ad24e2 . ISSN   0067-0049.
  14. ↑ 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.
  15. ↑ Bailer-Jones, C. A. L. (19 February 2015). "Close encounters of the stellar kind". Astronomy & Astrophysics. 575: A35. arXiv: 1412.3648 . Bibcode:2015A&A...575A..35B. doi: 10.1051/0004-6361/201425221 . eISSN   1432-0746. ISSN   0004-6361. S2CID   59039482.
  16. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256. S2CID   119533755.
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