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Gliese 69
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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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 43m 40.72450s[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 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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 edit
In 2019 one candidate planet been detected by the radial velocity method.[8]
| 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 edit
- ^ a b c d e f 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.
- ^ a b c 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.
- ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ 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.
- ^ a b c d 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.
- ^ a b c d e 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.
- ^ a b "HD 10436". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 September 2017.
- ^ Barnes, J. R.; et al. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644v1. Bibcode:2019arXiv190604644T.
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Company, Sol. "Research: K stars within 100 light-years". Retrieved 24 July 2011.