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 | M2.5 |
| 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 |
| ARICNS | data |
Gliese 54 (GJ 54 / HIP 5496 / LHS 1208)[1] is a star near the Solar System located at 25.7 light years away.[2] 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.[3] 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.[4] 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.[5]
The known stars closer to Gliese 54 are ζ Tucanae, solar analog 3.1 light years, and β Hydri 5.1 light years[6]
See also
References
- 1 2 3 "CD-68 47". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 May 2017.
- ↑ Benedict, G. F.; Henry, T. J.; Franz, O. G.; McArthur, B. E.; Wasserman, L. H.; Jao, Wei-Chun; Cargile, P. A.; Dieterich, S. B.; Bradley, A. J.; Nelan, E. P.; Whipple, A. L. (2016). "THE SOLAR NEIGHBORHOOD. XXXVII. THE MASS–LUMINOSITY RELATION FOR MAIN-SEQUENCE M DWARFS". The Astronomical Journal. 152 (5): 141. arXiv:1608.04775. Bibcode:2016AJ....152..141B. doi:10.3847/0004-6256/152/5/141. ISSN 1538-3881.
- ↑ 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)