Gliese 180
From Infogalactic: the planetary knowledge core
(Redirected from GJ 180)
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 53m 49.9798s[1] |
| Declination | −17° 46′ 24.294″[1] |
| Apparent magnitude (V) | 10.894[2] |
| Characteristics | |
| Evolutionary stage | Red dwarf |
| Spectral type | M2[2] |
| U−B color index | 1.155[2] |
| B−V color index | 1.549[2] |
| V−R color index | 1.018[2] |
| R−I color index | 1.205[2] |
| J−H color index | 0.553[2] |
| J−K color index | 0.815[2] |
| Astrometry | |
| Radial velocity (Rv) | 14.55 ± 0.24[3] km/s |
| Proper motion (μ) | RA: 405.2 ± 3.1[4] mas/yr Dec.: -650.6 ± 3.2[4] mas/yr |
| Parallax (π) | 80.89 ± 1.97[5] mas |
| Distance | 40.3 ± 1.0 ly (12.4 ± 0.3 pc) |
| Absolute magnitude (MV) | 10.48[2] |
| Details[6] | |
| Mass | 0.39 M☉ |
| Radius | 0.42 R☉ |
| Temperature | 3562 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
Gliese 180 (often shortened to GJ 180), is a red dwarf star, known to have two planets Gliese 180 b and Gliese 180 c.[3] It is located approximately 40 light-years away from Earth.[5]
According to the Planetary Habitability Laboratory (PHL) in Puerto Rico, both worlds in the system may be classifiable as potentially habitable planets.[7] However, Dr Mikko Tuomi, of the UK’s University of Hertfordshire, whose team identified the planets, disagreed, stating:
-
- "The PHL adds some sort of an “extended HZ”, which I, frankly, do not know how it’s calculated, but that adds some areas of potential habitability to the inner and outer edges of the HZ as we have defined it. They included the inner companion of the GJ 180 system (planet b) that we consider too hot to be potentially habitable.”[7]
External Resources
- Mikko Tuomi, Hugh R. A. Jones, John R. Barnes, Guillem Anglada-Escudé, James S. Jenkins, Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics, arxiv.org, 3 March 2014.
References
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