Astronomy:Gliese 22
From HandWiki
Short description: Star in the constellation Cassiopeia
| Observation data {{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]] [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}} | |
|---|---|
| Constellation | Cassiopeia |
| Gliese 22 A | |
| Right ascension | 00h 32m 29.4336s |
| Declination | +67° 14′ 08.409″ |
| Apparent magnitude (V) | 10.29 |
| Gliese 22 B | |
| Right ascension | 00h 32m 29.575s |
| Declination | +67° 14′ 04.63″ |
| Apparent magnitude (V) | 12.19 |
| Gliese 22 C | |
| Right ascension | 00h 32m 29.4s |
| Declination | +67° 14′ 08″ |
| Apparent magnitude (V) | 13.2 |
| Characteristics | |
| Spectral type | M2.5Ve / M3V |
| U−B color index | 1.16 |
| B−V color index | 1.54 |
| R−I color index | 0.99 |
| Variable type | Flare stars |
| Astrometry | |
| Radial velocity (Rv) | 10 km/s |
| Proper motion (μ) | RA: 1739.0 mas/yr Dec.: −224.93 mas/yr |
| Parallax (π) | 99.35 ± 2.17[2] mas |
| Distance | 32.8 ± 0.7 ly (10.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 11.83 |
| Orbit[3] | |
| Primary | Gliese 22 AC |
| Companion | Gliese 22 B |
| Period (P) | 223.3 yr |
| Semi-major axis (a) | 3.322″ |
| Eccentricity (e) | 0.293 |
| Inclination (i) | 47.3° |
| Longitude of the node (Ω) | 174.9° |
| Periastron epoch (T) | JD 1859.4 |
| Argument of periastron (ω) (secondary) | 146.3° |
| Orbit[4] | |
| Primary | Gliese 22 A (Aa) |
| Companion | Gliese 22 C (Ab) |
| Period (P) | 5,694.2±14.9 days |
| Semi-major axis (a) | 0.5106±0.0007″ |
| Eccentricity (e) | 0.163±0.002 |
| Inclination (i) | 43.7±0.2° |
| Longitude of the node (Ω) | 178.3±0.2° |
| Periastron epoch (T) | JD 51817.2 |
| Argument of periastron (ω) (secondary) | 284.5±0.5° |
| Details[5] | |
| Mass | 0.378(A) + 0.136(C) M☉ |
| Radius | 0.5(A) R☉ |
| Luminosity | 0.04 L☉ |
| Temperature | 2000–3500 K |
| Details | |
| B | |
| Mass | 0.382[6] M☉ |
| Radius | 0.394[6] R☉ |
| Luminosity | 0.011[7] L☉ |
| Temperature | 3,339[8] K |
| Metallicity [Fe/H] | −0.24[9] dex |
| Rotational velocity (v sin i) | <4[10] km/s |
| Other designations | |
2MASS J00322970+6714080, BD+66°34, CCDM J00325+6714, GJ 22, HIP 2552, LFT 47, V547 Cassiopeiae, ADS 440 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Gliese 22, also catalogued V547 Cassiopeiae or ADS 440, is a hierarchical star system approximately 33 light-years away in the constellation of Cassiopeia. The system consists of pair of red dwarf stars, Gliese 22A and Gliese 22C, orbited by a third red dwarf Gliese 22B in an outer orbit of about 223 years.
Planetary system
As of 2008, it was announced that a possible extrasolar planet, Gliese 22B b, orbits Gliese 22B but this is currently unconfirmed. The study in 2011 has indicated the orbit of the purported planet is stable.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | 16 MJ | — | 5,500 | 0 | — | — |
References
- ↑ Pettersen, B. R. (June 1975). "Discovery of flare activity on BD +66 34 (= Gliese 22 A)". Astronomy and Astrophysics 41: 113. Bibcode: 1975A&A....41..113P. https://ui.adsabs.harvard.edu/abs/1975A&A....41..113P. Retrieved 27 November 2021.
- ↑ van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ Docobo, J. A.; Tamazian, V. S.; Balega, Y. Y.; Andrade, M.; Schertl, D.; Weigelt, G.; Campo, P.; Palacios, M. (2008). "A methodology for studying physical and dynamical properties of multiple stars. Application to the system of red dwarfs Gl 22". Astronomy and Astrophysics 478 (1): 187. doi:10.1051/0004-6361:20078594. Bibcode: 2008A&A...478..187D.
- ↑ Benedict, G. F. et al. (2016). "The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence M Dwarfs". The Astronomical Journal 152 (5): 141. doi:10.3847/0004-6256/152/5/141. Bibcode: 2016AJ....152..141B.
- ↑ McCarthy, D. W.; Henry, Todd J.; McLeod, Brian; Christou, Julian C. (1991). "The Low-Mass Companion of Gliese 22A: First Results of the Steward Infrared Speckle Camera". The Astronomical Journal 101: 214. doi:10.1086/115681. Bibcode: 1991AJ....101..214M.
- ↑ 6.0 6.1 Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berlind, Perry; Calkins, Michael L.; Mink, Jessica (2017). "The Hα Emission of Nearby M Dwarfs and its Relation to Stellar Rotation". The Astrophysical Journal 834 (1): 85. doi:10.3847/1538-4357/834/1/85. Bibcode: 2017ApJ...834...85N.
- ↑ McLean, M.; Berger, E.; Reiners, Ansgar (February 2012). "The Radio Activity-Rotation Relation of Ultracool Dwarfs". The Astrophysical Journal 746 (1): 23. doi:10.1088/0004-637X/746/1/23. Bibcode: 2012ApJ...746...23M.
- ↑ Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal 158 (2): 56. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H.
- ↑ Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling et al. (2019), "How to constrain your M dwarf. II. The Mass-Luminosity-Metallicity relation from 0.075 to 0.70 solar masses", The Astrophysical Journal 871 (1): 63, doi:10.3847/1538-4357/aaf3bc, Bibcode: 2019ApJ...871...63M
- ↑ Jeffers, S. V.; Schöfer, P.; Lamert, A.; Reiners, A.; Montes, D.; Caballero, J. A.; Cortés-Contreras, M.; Marvin, C. J. et al. (2018). "CARMENES input catalogue of M dwarfs. III. Rotation and activity from high-resolution spectroscopic observations". Astronomy and Astrophysics 614: A76. doi:10.1051/0004-6361/201629599. Bibcode: 2018A&A...614A..76J.
- ↑ Andrade, Manuel; Docobo, José A. (2011). "On the dynamical stability of the very low-mass object Gliese 22 Bb". Icarus 215 (2): 712. doi:10.1016/j.icarus.2011.07.008. Bibcode: 2011Icar..215..712A.
External links
- "Descoberta de novo planeta gigante extrasolar" (in es). Universia. 2008-03-16. http://www.universia.es/html_trad/portada/actualidad/noticia_actualidad_trad/params/anyo/2008/mes/Marzo/noticia/jfhhg.html.
- "Notes for star Gliese 22 B". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=Gliese+22+B#a_publi. Retrieved 2008-08-10.
 | This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it. |
Template:Brown-dwarf-stubTemplate:Multi-star-stub
 |  |
