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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 Gliese 22B in an outer orbit of about 223 years.

Gliese 22

A blue band light curve for a flare of Gliese 22A, adapted from Pettersen (1975)[1]
Observation data
Epoch J2000.0      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 mas[2]
Distance32.8 ± 0.7 ly
(10.1 ± 0.2 pc)
Absolute magnitude (MV)11.83
Orbit[3]
PrimaryGliese 22 AC
CompanionGliese 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]
PrimaryGliese 22 A (Aa)
CompanionGliese 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]
Mass0.378(A) + 0.136(C) M☉
Radius0.5(A) R☉
Luminosity0.04 L☉
Temperature2000–3500 K
Details
B
Mass0.382[6] M☉
Radius0.394[6] R☉
Luminosity0.011[7] L☉
Temperature3,339[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, Gl 22, HIP 2552, LFT 47, V547 Cassiopeiae, ADS 440
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

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]

The Gliese 22 B planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) 16 MJ — 5,500 0 — —

References


  1. Pettersen, B. R. (June 1975). "Discovery of flare activity on BD +66 34 (= Gliese 22 A)". Astronomy and Astrophysics. 41: 113. Retrieved 27 November 2021.
  2. van Leeuwen, F. (November 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.
  3. 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. Bibcode:2008A&A...478..187D. doi:10.1051/0004-6361:20078594.
  4. 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. arXiv:1608.04775. Bibcode:2016AJ....152..141B. doi:10.3847/0004-6256/152/5/141.
  5. 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. Bibcode:1991AJ....101..214M. doi:10.1086/115681.
  6. 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. arXiv:1611.03509. Bibcode:2017ApJ...834...85N. doi:10.3847/1538-4357/834/1/85. S2CID 55000202.
  7. McLean, M.; Berger, E.; Reiners, Ansgar (February 2012). "The Radio Activity-Rotation Relation of Ultracool Dwarfs". The Astrophysical Journal. 746 (1): 23. arXiv:1108.0415. Bibcode:2012ApJ...746...23M. doi:10.1088/0004-637X/746/1/23. S2CID 119159519.
  8. 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. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104.
  9. Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling; Dittmann, Jason; Factor, Samuel; Feiden, Gregory; Martinez, Raquel A.; Ruíz-Rodríguez, Dary; Chia Thao, Pa (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, arXiv:1811.06938, Bibcode:2019ApJ...871...63M, doi:10.3847/1538-4357/aaf3bc, S2CID 119372932
  10. Jeffers, S. V.; Schöfer, P.; Lamert, A.; Reiners, A.; Montes, D.; Caballero, J. A.; Cortés-Contreras, M.; Marvin, C. J.; Passegger, V. M.; Zechmeister, M.; Quirrenbach, A.; Alonso-Floriano, F. J.; Amado, P. J.; Bauer, F. F.; Casal, E.; Diez Alonso, E.; Herrero, E.; Morales, J. C.; Mundt, R.; Ribas, I.; Sarmiento, L. F. (2018). "CARMENES input catalogue of M dwarfs. III. Rotation and activity from high-resolution spectroscopic observations". Astronomy and Astrophysics. 614: A76. arXiv:1802.02102. Bibcode:2018A&A...614A..76J. doi:10.1051/0004-6361/201629599. S2CID 56147445.
  11. Andrade, Manuel; Docobo, José A. (2011). "On the dynamical stability of the very low-mass object Gliese 22 Bb". Icarus. 215 (2): 712. Bibcode:2011Icar..215..712A. doi:10.1016/j.icarus.2011.07.008.


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На других языках

- [en] Gliese 22

[es] Gliese 22

Gliese 22 (GJ 22 / HIP 2552 / LHS 114/115) es una estrella múltiple en la constelación de Casiopea situada casi en el límite con la constelación de Cefeo. Se encuentra 33 años luz de distancia del sistema solar. En 2008 un grupo de astrónomos españoles anunciaron el descubrimiento de un planeta extrasolar en torno a una de las estrellas del sistema.[1]


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