Gliese 22

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Gliese 22
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) 98.74 ± 3.37 mas
Distance 33 ± 1 ly
(10.1 ± 0.3 pc)
Absolute magnitude (MV) 11.83
Orbit
Companion Gliese 22 B
Period (P) 320 yr
Semimajor axis (a) 4"
Inclination (i) 140°
Orbit
Companion Gliese 22 C
Period (P) 16 yr
Semimajor axis (a) 0.5"
Details
Mass 0.4 M☉
Radius 0.5 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
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia		 data

Gliese 22, also catalogued V547 Cassiopeiae or shortened to Gl 22, is a hierarchical star system approximately 33 light-years away in the constellation of Cassiopeia. The system consists of two red dwarf stars, Gliese 22A and Gliese 22B in an outer orbit of about 320 years, and a brown dwarf, Gliese 22C, which orbits Gliese 22A in about 16 years. As of 2008, it was announced that a possible extrasolar planet, Gliese 22B b, or brown dwarf orbits Gliese 22B but this is currently unconfirmed.

[edit] Planetary system

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

[edit] External links

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