Astronomy:Gliese 880
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Short description: Star in the constellation Pegasus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 56m 34.805s[1] |
| Declination | +16° 33′ 12.36″[1] |
| Apparent magnitude (V) | 8.68[2] |
| Characteristics | |
| Evolutionary stage | Main-sequence star |
| Spectral type | M1.5V[3] |
| Apparent magnitude (B) | 10.187[2] |
| Apparent magnitude (R) | 7.80[2] |
| Apparent magnitude (I) | 7.100[2] |
| Apparent magnitude (J) | 5.360±0.020[2] |
| Apparent magnitude (H) | 4.800±0.036[2] |
| Apparent magnitude (K) | 4.523±0.016[2] |
| B−V color index | 1.507±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −27.87±0.13[1] km/s |
| Proper motion (μ) | RA: −1034.733(26)[1] mas/yr Dec.: −284.131(25)[1] mas/yr |
| Parallax (π) | 145.6234 ± 0.0255[1] mas |
| Distance | 22.397 ± 0.004 ly (6.867 ± 0.001 pc) |
| Absolute magnitude (MV) | 9.50[2] |
| Details[4] | |
| Mass | 0.569 M☉ |
| Radius | 0.548±0.005 R☉ |
| Luminosity | 0.05112±0.00074 L☉ |
| Habitable zone inner limit | 0.218 AU |
| Habitable zone outer limit | 0.435 AU |
| Surface gravity (log g) | 4.77[5] cgs |
| Temperature | 3,713±11 K |
| Metallicity [Fe/H] | +0.20±0.05[6] dex |
| Rotation | 37.5±0.1 d[7] |
| Rotational velocity (v sin i) | 2.07[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gliese 880 is a red dwarf star 22.4 light-years away in the northern constellation of Pegasus. No stellar companions to Gliese 880 have been discovered as of 2020.[9]
Search for planets
In June 2019, a candidate planet detected by radial velocity in orbit around Gliese 880 was reported in a preprint. This would have a minimum mass about 8.5 times that of Earth and orbit with a period of 39.4 days,[10] which is close to the star's rotation period of 37.5 days.[7] A 2024 study did not detect the exact period of 39.4 days, but detected two radial velocity signals at 37.2 and 40.5 days, which correspond to the stellar rotation and an alias of it. Presumably, the previously claimed planet candidate is an artifact of stellar activity.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ Fuhrmeister, B. et al. (2019), "The CARMENES search for exoplanets around M dwarfs. Period search in H{alpha}, Na I D, and Ca II IRT lines", Astronomy & Astrophysics 623: A24, doi:10.1051/0004-6361/201834483, Bibcode: 2019A&A...623A..24F
- ↑ Boyajian, Tabetha S.; von Braun, Kaspar; van Belle, Gerard; McAlister, Harold A.; Brummelaar, Theo A. ten; Kane, Stephen R.; Muirhead, Phil; Jones, Jeremy et al. (2012-10-01). "Stellar Diameters and Temperatures II. Main Sequence K & M Stars". The Astrophysical Journal 757 (2): 112. doi:10.1088/0004-637X/757/2/112. ISSN 0004-637X. Bibcode: 2012ApJ...757..112B.
- ↑ Abia, C. et al. (2020), "The CARMENES search for exoplanets around M dwarfs: Rubidium abundances in nearby cool stars", Astronomy & Astrophysics 642: A227, doi:10.1051/0004-6361/202039032, Bibcode: 2020A&A...642A.227A
- ↑ 6.0 6.1 Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics 604: A97. doi:10.1051/0004-6361/201730715. Bibcode: 2017A&A...604A..97L.
- ↑ 7.0 7.1 Suárez Mascareño, A. et al. (September 2015). "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators". Monthly Notices of the Royal Astronomical Society 452 (3): 2745–2756. doi:10.1093/mnras/stv1441. Bibcode: 2015MNRAS.452.2745S.
- ↑ "HD 216899". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+216899.
- ↑ Lamman, Claire et al. (2020), "Robo-AO M-dwarf Multiplicity Survey: Catalog", The Astronomical Journal 159 (4): 139, doi:10.3847/1538-3881/ab6ef1, Bibcode: 2020AJ....159..139L
- ↑ Barnes, J. R.; et al. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].
- ↑ Mignon, L. et al. (September 2024). "Radial velocity homogeneous analysis of M dwarfs observed with HARPS". Astronomy & Astrophysics 689: A32. doi:10.1051/0004-6361/202346570.
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