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)	320 yr
Semi-major axis (a)	4″
Inclination (i)	140°
Orbit
Primary	Gliese 22 A
Companion	Gliese 22 C
Period (P)	16.12±0.20 yr
Semi-major axis (a)	0.529±0.005″
Eccentricity (e)	0.18±0.03
Inclination (i)	46±1°
Details
Mass	= 0.378(A) + 0.136(C) M☉
Radius	0.5(A) R☉
Luminosity	0.04 L☉
Temperature	2000–3500 K
Other designations
	2MASS J00322970+6714080, BD+66° 34, CCDM J00325+6714, Gl 22, HIP 2552, LFT 47, V547 Cassiopeiae, ADS 440, Gaia DR2 527956488339113472
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 Gliese 22B in an outer orbit of about 320 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.^[5]

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[]

^ 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.
^ 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
^ Woitas, J.; Tamazian, V. S.; Docobo, J. A.; Leinert, Ch. (2003), "Visual orbit for the low-mass binary Gliese 22 AC from speckle interferometry", Astronomy & Astrophysics, 406: 293–298, arXiv:astro-ph/0305330, Bibcode:2003A&A...406..293W, doi:10.1051/0004-6361:20030756, S2CID 12279366
^ The low-mass companion of gliese 22A: First results of the steward observatory infrared speckle camera
^ ON THE DYNAMICAL STABILITY OF THE VERY LOW-MASS OBJECT GLIESE 22 BB

External links[]

"Descoberta de novo planeta gigante extrasolar". Universia (in Spanish). 2008-03-16. Retrieved 2008-08-10.
"Notes for star Gliese 22 B". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-10.

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[Pettersen-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.

[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

[3] Woitas, J.; Tamazian, V. S.; Docobo, J. A.; Leinert, Ch. (2003), "Visual orbit for the low-mass binary Gliese 22 AC from speckle interferometry", Astronomy & Astrophysics, 406: 293–298, arXiv:astro-ph/0305330, Bibcode:2003A&A...406..293W, doi:10.1051/0004-6361:20030756, S2CID 12279366

[4] The low-mass companion of gliese 22A: First results of the steward observatory infrared speckle camera

[5] ON THE DYNAMICAL STABILITY OF THE VERY LOW-MASS OBJECT GLIESE 22 BB

[1]

[2]

[3]

[4]

[5]

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^[2] mas
Distance	32.8 ± 0.7 ly (10.1 ± 0.2 pc)
Absolute magnitude (M_V)	11.83

Orbit
Primary	Gliese 22 AC
Companion	Gliese 22 B
Period (P)	320 yr
Semi-major axis (a)	4″
Inclination (i)	140°
Orbit^[3]
Primary	Gliese 22 A
Companion	Gliese 22 C
Period (P)	16.12±0.20 yr
Semi-major axis (a)	0.529±0.005″
Eccentricity (e)	0.18±0.03
Inclination (i)	46±1°
Details^[4]

Mass	= 0.378(A) + 0.136(C) `M`_☉
Radius	0.5(A) `R`_☉
Luminosity	0.04 `L`_☉
Temperature	2000–3500 K

Other designations
2MASS J00322970+6714080, BD+66° 34, CCDM J00325+6714, Gl 22, HIP 2552, LFT 47, V547 Cassiopeiae, ADS 440, Gaia DR2 527956488339113472
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	data