Gliese 22

Gliese 22
	; A blue band light curve for a flare of Gliese 22A, adapted from Pettersen (1975)
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
Distance	32.8 ± 0.7 ly ; (10.1 ± 0.2 pc)
Absolute magnitude (MV)	11.83
Orbit
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
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
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 M☉
Radius	0.394 R☉
Luminosity	0.011 L☉
Temperature	3,339 K
Metallicity [Fe/H]	−0.24 dex
Rotational velocity (v sin i)	<4 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

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.

The discovery of flare activity on Gliese 22A was announced by Bjørn Ragnvald Pettersen in 1975,^[1] which led to it being given a variable star designation, V547 Cassiopeiae, in 1977.^[11]

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.^[12]

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

References

^ ^a ^b 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. Archived from the original on 27 November 2021. Retrieved 27 November 2021.
^ 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.
^ 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.
^ 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.
^ 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.
^ ^a ^b 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.
^ 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.
^ 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.
^ 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
^ 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.
^ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars". Information Bulletin on Variable Stars (1248). Bibcode:1977IBVS.1248....1K. Retrieved 28 August 2024.
^ 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.

External links

"Descoberta de novo planeta gigante extrasolar". Universia (in Spanish). 2008-03-16. Archived from the original on 2008-10-17. Retrieved 2008-08-10.
"Notes for star Gliese 22 B". Extrasolar Planets Encyclopaedia. Archived from the original on 2008-10-23. Retrieved 2008-08-10.

This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it.

This brown dwarf-related article is a stub. You can help Wikipedia by expanding it.

This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it.

This variable star–related article is a stub. You can help Wikipedia by expanding it.

[Pettersen-1] 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. Archived from the original on 27 November 2021. Retrieved 27 November 2021.

[van_Leeuwen2007-2] 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.

[docobo2008-3] 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.

[benedict2016-4] 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.

[mccarthy1991-5] 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.

[newton2017-6] 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.

[mclean2012-7] 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.

[houdebine2019-8] 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.

[mann2019-9] 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

[carmenes-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.

[IBVS-11] Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars". Information Bulletin on Variable Stars (1248). Bibcode:1977IBVS.1248....1K. Retrieved 28 August 2024.

[andrade2011-12] 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.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

Observation data Epoch J2000.0 Equinox J2000.0
A blue band light curve for a flare of Gliese 22A, adapted from Pettersen (1975)^[1]
Constellation	Cassiopeia
Gliese 22 A
Right ascension	00^h 32^m 29.4336^s
Declination	+67° 14′ 08.409″
Apparent magnitude (V)	10.29
Gliese 22 B
Right ascension	00^h 32^m 29.575^s
Declination	+67° 14′ 04.63″
Apparent magnitude (V)	12.19
Gliese 22 C
Right ascension	00^h 32^m 29.4^s
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 (R_v)	10 km/s
Proper motion (μ)	RA: 1739.0 mas/yr Dec.: −224.93 mas/yr
Parallax (π)	99.35 ± 2.17 mas^[2]
Distance	32.8 ± 0.7 ly (10.1 ± 0.2 pc)
Absolute magnitude (M_V)	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