Gliese 22

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Gliese 22
Gliese22ALightCurve.png
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]
Distance 32.8 ± 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]
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.

Contents

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 5,5000

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References

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  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.
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  6. 1 2 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.
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