HD 203842

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HD 203842
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 24m 24.56s[1]
Declination +10° 10′ 27.27″[1]
Apparent magnitude (V) 6.32±0.01[2]
Characteristics
Spectral type F5III[3]
U−B color index +0.13[4]
B−V color index +0.47[4]
Astrometry
Radial velocity (Rv)−33.2±2[5] km/s
Proper motion (μ) RA: +75.072±0.118[1] mas/yr
Dec.: +20.436±0.184[1] mas/yr
Parallax (π)9.9662 ± 0.0646[1] mas
Distance327 ± 2 ly
(100.3 ± 0.7 pc)
Absolute magnitude (MV)1.21
Details
Mass1.85[6] M☉
Radius4.10+0.17
−0.06[1] R☉
Luminosity24.3+0.1
−0.2[1] L☉
Temperature6333+45
−132[1] K
Metallicity [Fe/H]+0.08[7] dex
Rotational velocity (v sin i)50[7] km/s
Age1.25[6] Gyr
Other designations
HR 8191, HIP 105695, SAO 126774, BD+09° 4800
Database references
SIMBADdata

HD 203842 is a solitary star in the constellation Equuleus. With an apparent magnitude of 6.32, it's barely visible to the naked eye under ideal conditions. The star is located 327 light-years (100 parsecs) based on parallax, but is drifting closer with a heliocentric radial velocity of -33 km/s. HD 203842 is part of the Hyades Stream,[8] which is not related to the Hyades Cluster.

Properties[]

HD 203842 has 1.85 times the Sun's mass, but at an age of 1.25 billion years, has expanded to 4 times the Sun's radius. It radiates at 24 times the Sun's luminosity from it's enlarged photosphere at an effective temperature of 6,333 K. Despite it being classified as a giant star, it has a projected rotational velocity of 50 km/s, and 120% the abundance of heavy metals compared to the Sun.

References[]

  1. ^ a b c d e f g 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.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. ISSN 0004-6361.
  3. ^ Roman, Nancy G. (1 December 1955). "A Catalogue of High-Velocity Stars". The Astrophysical Journal Supplement Series. 2: 195. doi:10.1086/190021. ISSN 0067-0049.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110.
  5. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication.
  6. ^ a b Dotter, Aaron; Chaboyer, Brian; Jevremovic, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (1 September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series. 178: 89–101. arXiv:0804.4473. doi:10.1086/589654. ISSN 0067-0049.
  7. ^ a b Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (1 May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs". Astronomy and Astrophysics. 418: 989–1019. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
  8. ^ Montes, D.; López-Santiago, J.; Gálvez, M. C.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M. (1 November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society. 328: 45–63. doi:10.1046/j.1365-8711.2001.04781.x. ISSN 0035-8711.
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