Gliese 54
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h 10m 22.8809s |
| Declination | −67° 26′ 41.949″ |
| Apparent magnitude (V) | 9.80 |
| Characteristics | |
| Spectral type | M2.5 (composite) |
| Astrometry | |
| Proper motion (μ) | RA: 386.2±0.2 mas/yr Dec.: 579.7±0.1 mas/yr |
| Parallax (π) | 126.9±0.4 mas |
| Distance | 25.70 ± 0.08 ly (7.88 ± 0.02 pc) |
| Absolute magnitude (MV) | +10.23 |
| Orbit | |
| Primary | Gliese 54 A |
| Name | Gliese 54 B |
| Period (P) | 1.14434+0.00022 −0.00022 yr |
| Semi-major axis (a) | 0.12619±0.00039" (1.00 AU) |
| Eccentricity (e) | 0.1718±0.0024 |
| Inclination (i) | 125.32+0.35 −0.35° |
| Details | |
| Gliese 54 A | |
| Mass | 0.43 M☉ |
| Radius | 0.51 R☉ |
| Temperature | 4250 K |
| Metallicity | 0.17 |
| Rotational velocity (v sin i) | -15.0 km/s |
| Gliese 54 B | |
| Mass | 0.3 M☉ |
| Other designations | |
| NSV 427, CD−68°47, GJ 54, HIP 5496, LHS 1208, 2MASS J01102281-6726425 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Gliese 54, also known as HIP 5496 and LHS 1208, is a nearby star system. It is 25.7 light-years away, in the constellation of Tucana, close to the edge, almost in the neighboring Hydrus. It is below the threshold of brightness to be observable to the naked eye with an apparent magnitude of +9.80.
The two stars of this system have an orbital period a little over a year, and are smaller than the Sun. The main component is a red dwarf of spectral type M2 with an effective temperature of 4,250 K, a mass 43% that of the Sun and a radius 51% that of the Sun. The companion, a red dwarf which brightness is about one magnitude lower than the primary, has been resolved with the instrument NICMOS installed in the Hubble Space Telescope. It is 30% as massive as the Sun.
In the SIMBAD database it appears listed as a variable star, getting the provisional designation NSV 427 from the New Catalogue of Suspected Variable Stars.
The closest stars to Gliese 54 are Zeta Tucanae, a solar analog at 3.1 light-years, and Beta Hydri, at 5.1 light-years.