Gliese 54
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h 10m 22.90s |
| Declination | −67° 26′ 41.8″ |
| Apparent magnitude (V) | 9.80 |
| Characteristics | |
| Spectral type | M2 |
| Astrometry | |
| Absolute magnitude (MV) | +10.23 |
| Details | |
| Radius | 0.51 R☉ |
| Temperature | 4250 K |
| Rotational velocity (v sin i) | -15.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gliese 54 (GJ 54 / HIP 5496 / LHS 1208)[1] is a star near the Solar System located at 26.6 light years away. It is located in the constellation of Tucana, close to the edge, almost in the neighboring Hydrus. It is below the threshold brightness to be observable eye with an apparent magnitude of +9.80,.[1]
Gliese 54 is a red dwarf of spectral type M2 with an effective temperature of 4250 K.[2] In the SIMBAD database it appears listed as variable star, getting the provisional variable designation NSV 427.[1] It has a companion with which it forms a binary system whose orbital period is 427 ± 9 days. The companion, a red dwarf whose brightness is ~1 magnitude lower than Gliese 54, has been resolved with the instrument NICMOS installed in the Hubble Space Telescope.[3] The semimajor axis projected from the orbit is 19.0 milliarcseconds; plausible for a total mass of 0.5 solar masses, the relationship between the masses of the components q = M2 / M1 is equal to 0.83.[4]
The known stars closer to Gliese 54 are ζ Tucanae, solar analog 3.1 light years, and β Hydri 5.1 light years[5]
See also
References
- 1 2 3 NSV 427 - Variable Star (SIMBAD)
- ↑ Morales, J. C .; Ribas, I .; Jordi, C. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics. 478 (2). pp. 507-512 (Table consulted on CDS).
- ↑ Golimowski, David A .; Henry, Todd J .; Krist, John E .; Dieterich, Sergio; Ford, Holland C .; Illingworth, Garth D .; Ardila, David R .; Clampin, Mark; Franz, Otto G .; Wasserman, Lawrence H .; Benedict, G. Fritz; McArthur, Barbara E .; Nelan, Edmund G. (2004). "The Solar Neighborhood. IX. Hubble Space Telescope Detections of Companions to Five M and L Dwarfs Within 10 parsecs of the Sun". The Astronomical Journal. 128 (4): 1733–1747. arXiv:astro-ph/0406664
. Bibcode:2004AJ....128.1733G. doi:10.1086/423911. - ↑ Goldin, A .; Makarov, V. V. (2007). "Astrometric Orbits for Hipparcos Stochastic Binaries". The Astrophysical Journal Supplement Series. 173 (1). pp. 137-142.
- ↑ Stars Within 15 light-years of Cape Photographic Durchmusterung -68 ° 41 (The Internet Stellar Database)