| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h 10m 22.8809s[1] |
| Declination | −67° 26′ 41.9487″[1] |
| Apparent magnitude (V) | 9.80 |
| Characteristics | |
| Spectral type | M2.5 (composite) |
| Astrometry | |
| Proper motion (μ) | RA: 386.2±0.2[2]mas/yr Dec.: 579.7±0.1[2]mas/yr |
| Parallax (π) | 126.9±0.4 mas[2] |
| Distance | 25.70 ± 0.08 ly (7.88 ± 0.02 pc) |
| Absolute magnitude (MV) | +10.23 |
| Orbit[3] | |
| Primary | Gliese 54 A |
| Companion | Gliese 54 B |
| Period (P) | 1.14434+0.00022 −0.00022yr |
| Semi-major axis (a) | 0.12619±0.00039" (1.00AU) |
| Eccentricity (e) | 0.1718±0.0024 |
| Inclination (i) | 125.32+0.35 −0.35° |
| Details[4] | |
| Gliese 54 A | |
| Mass | 0.43 M☉ |
| Radius | 0.51 R☉ |
| Temperature | 4250 K |
| Metallicity | 0.17[3] |
| 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[5] | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Gliese 54, also known as HIP 5496 and LHS 1208, is a nearbystar system. It is 25.7light-years away, in theconstellation ofTucana, close to the edge, almost in the neighboringHydrus. It is below the threshold of brightness to be observable to the nakedeye with anapparent magnitude of +9.80.
The two stars of this system have anorbital period a little over a year,[3] and are smaller than the Sun.[4] The main component is ared dwarf ofspectral type M2 with aneffective temperature of 4,250K, a mass 43% that of the Sun and a radius 51% that of the Sun.[4] The companion, a red dwarf which brightness is about one magnitude lower than the primary, has beenresolved with the instrumentNICMOS installed in theHubble Space Telescope.[6] It is 30% as massive as the Sun.[4]
In theSIMBAD database it appears listed as avariable star, getting the provisional designation NSV 427 from theNew Catalogue of Suspected Variable Stars.[5]
The closest stars to Gliese 54 areZeta Tucanae, asolar analog at 3.1 light-years, andBeta Hydri, at 5.1 light-years.[7]
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