HD 203842

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	F5 III[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 mas/yr[1] ; Dec.: +20.436 mas/yr[1]
Parallax (π)	9.9662 ± 0.0646 mas[1]
Distance	327 ± 2 ly ; (100.3 ± 0.7 pc)
Absolute magnitude (MV)	1.21
Details
Mass	2.04+0.02; −0.03[6] M☉
Radius	3.87+0.23; −0.22[6] R☉
Luminosity	24.3+0.1; −0.2[1] L☉
Temperature	6333+45; −132[1] K
Metallicity [Fe/H]	+0.19+0.04; −0.05[6] dex
Rotational velocity (v sin i)	50[7] km/s
Age	1.07±0.05[6] Gyr
Other designations
	30 G. Equulei, AG+09°2981, BD+09°4800, GC 29969, HIP 105695, HR 8191, SAO 126774
Database references
SIMBAD	data

HD 203842 (HR 8191) 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.

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 its 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

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.
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. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
Roman, Nancy G. (1 December 1955). "A Catalogue of High-Velocity Stars". The Astrophysical Journal Supplement Series. 2: 195. Bibcode:1955ApJS....2..195R. doi:10.1086/190021. ISSN 0067-0049.
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. Bibcode:1966CoLPL...4...99J.
Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
Bochanski, John J.; Faherty, Jacqueline K.; Gagné, Jonathan; Nelson, Olivia; Coker, Kristina; Smithka, Iliya; Desir, Deion; Vasquez, Chelsea (13 March 2018). "Fundamental Properties of Co-moving Stars Observed by Gaia". The Astronomical Journal. 155 (4): 149. arXiv:1801.00537. Bibcode:2018AJ....155..149B. doi:10.3847/1538-3881/aaaebe. ISSN 0004-6256. S2CID 119256051.
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. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. S2CID 11027621.
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. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x. ISSN 0035-8711. S2CID 55727428.

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[GaiaDR2-1] 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.

[Tycho2000-2] 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. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[Roman1955-3] Roman, Nancy G. (1 December 1955). "A Catalogue of High-Velocity Stars". The Astrophysical Journal Supplement Series. 2: 195. Bibcode:1955ApJS....2..195R. doi:10.1086/190021. ISSN 0067-0049.

[Johnson1966-4] 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. Bibcode:1966CoLPL...4...99J.

[Wilson1953-5] Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.

[Bochanksi2018-6] Bochanski, John J.; Faherty, Jacqueline K.; Gagné, Jonathan; Nelson, Olivia; Coker, Kristina; Smithka, Iliya; Desir, Deion; Vasquez, Chelsea (13 March 2018). "Fundamental Properties of Co-moving Stars Observed by Gaia". The Astronomical Journal. 155 (4): 149. arXiv:1801.00537. Bibcode:2018AJ....155..149B. doi:10.3847/1538-3881/aaaebe. ISSN 0004-6256. S2CID 119256051.

[Nordstom2004-7] 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. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. S2CID 11027621.

[Montes2001-8] 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. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x. ISSN 0035-8711. S2CID 55727428.