Gliese 54

Gliese 54 (GJ 54 / HIP 5496 / LHS 1208)[3] 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,.[3]

Gliese 54
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
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[2] mas
Distance25.70 ± 0.08 ly
(7.88 ± 0.02 pc)
Absolute magnitude (MV)+10.23
Details
Radius0.51 R☉
Temperature4250 K
Rotational velocity (v sin i)-15.0 km/s
Other designations
CD−68°47, HIP 5496, LHS 1208
Database references
SIMBADdata
ARICNSdata

Gliese 54 is a red dwarf of spectral type M2 with an effective temperature of 4250 K.[4] In the SIMBAD database it appears listed as variable star, getting the provisional variable designation NSV 427.[3] 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.[5] 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.[6]

The known stars closer to Gliese 54 are ζ Tucanae, solar analog 3.1 light years, and β Hydri 5.1 light years[7]

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Benedict, G. F.; et al. (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.
  3. "CD-68 47". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 May 2017.
  4. Morales, J. C.; Ribas, I.; Jordi, C. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics. 478 (2): 507. arXiv:0711.3523. Bibcode:2008A&A...478..507M. doi:10.1051/0004-6361:20078324. pp. 507-512 (Table consulted on CDS).
  5. 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.
  6. Goldin, A.; Makarov, V. V. (2007). "Astrometric Orbits for Hipparcos Stochastic Binaries". The Astrophysical Journal Supplement Series. 173 (1): 137. arXiv:0706.0361. Bibcode:2007ApJS..173..137G. doi:10.1086/520513. pp. 137-142.
  7. Stars Within 15 light-years of Cape Photographic Durchmusterung -68 ° 41 (The Internet Stellar Database)
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