Gliese 69

Gliese 69

Observation data Epoch J2000      Equinox J2000
Constellation	Cassiopeia
Right ascension	01^h 43^m 40.72450^s[1]
Declination	+63° 49′ 24.2390″[1]
Apparent magnitude (V)	8.40[2]
Characteristics
Spectral type	K5 Vbe[2]
U−B color index	+1.12[3]
B−V color index	+1.22[3]
Astrometry
Radial velocity (Rv)	−50.827 ± 0.0075[4] km/s
Proper motion (μ)	RA: −394.73[1] mas/yr Dec.: −582.26[1] mas/yr
Parallax (π)	73.65 ± 0.98 mas[1]
Distance	44.3 ± 0.6 ly (13.6 ± 0.2 pc)
Details
Mass	0.624[5] M☉
Radius	0.59[5] R☉
Surface gravity (log g)	4.70[5] cgs
Temperature	4312[6] K
Metallicity [Fe/H]	−0.39[6] dex
Age	6.89 ± 4.70[6] Gyr
Other designations
BD+63° 229, GJ 69, HD 10436, HIP 8070, SAO 11943, LHS 1291.[7]
Database references
SIMBAD	data
ARICNS	data

Gliese 69 is a star located in the constellation of Cassiopeia. It has an apparent magnitude of 8.40.[2] Parallax measurements by Hipparcos put it at a distance of 44.3 light-years (13.6 parsecs) away.[1]

Gliese 69 is a K-type main-sequence star that is smaller and less massive than the Sun.[5] It glows with an effective temperature of 4,312 K.[6] It is around 6.9 billion years old,[6] significantly older than the Sun. Gliese 69 is also known by its designations HD 10436 and LHS 1291.[7]

Planetary System

In 2019 one candidate planet been detected by the radial velocity method.[8]

The Gliese 69 planetary system

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	8.3+3.7 −3.2 M🜨	0.043±0.004	3.84237+0.00085 −0.00054	0.03+0.20 −0.03	—	—

References

1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
2. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
3. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
4. Soubiran, C.; Jasniewicz, G.; Chemin, L.; Crifo, F.; Udry, S.; Hestroffer, D.; Katz, D. (2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: A64. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. S2CID 56094559.
5. Takeda, Genya; Ford, Eric B.; Sills, Alison; Rasio, Frederic A.; Fischer, Debra A.; Valenti, Jeff A. (February 2007). "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog". The Astrophysical Journal Supplement Series. 168 (2): 297–318. arXiv:astro-ph/0607235. Bibcode:2007ApJS..168..297T. doi:10.1086/509763. S2CID 18775378.
6. Pace, G. (March 2013). "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram". Astronomy & Astrophysics. 551: 4. arXiv:1301.5651. Bibcode:2013A&A...551L...8P. doi:10.1051/0004-6361/201220364. S2CID 56420519. L8.
7. "HD 10436". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 September 2017.
8. Barnes, J. R.; et al. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644v1. Bibcode:2019arXiv190604644T. {{cite journal}}: Cite journal requires |journal= (help)

Company, Sol. "Research: K stars within 100 light-years". Archived from the original on 24 December 2017. Retrieved 24 July 2011. {{cite web}}: |last= has generic name (help)