Gliese 22
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (May 2010) |
| 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[1] |
| Distance | 32.8 ± 0.7 ly (10.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 11.83 |
| Orbit | |
| Companion | Gliese 22 B |
| Period (P) | 320 yr |
| Semi-major axis (a) | 4″ |
| Inclination (i) | 140° |
| Orbit | |
| Companion | Gliese 22 C |
| Period (P) | 16 yr |
| Semi-major axis (a) | 0.5″ |
| Details | |
| Mass | 0.4 M☉ |
| Radius | 0.5 R☉ |
| Luminosity | 0.04 L☉ |
| Temperature | 2000–3500 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Gliese 22, also catalogued V547 Cassiopeiae, 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.
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
- ^ 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
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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