Gliese 54

Gliese 54 (GJ 54 / HIP 5496 / LHS 1208)[5] 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,.[5]

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 (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[2] mas
Distance25.70 ± 0.08 ly
(7.88 ± 0.02 pc)
Absolute magnitude (MV)+10.23
Orbit[3]
PrimaryGliese 54 A
CompanionGliese 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[4]
Gliese 54 A
Mass0.43 M☉
Radius0.51 R☉
Temperature4250 K
Metallicity0.17[3]
Rotational velocity (v sin i)-15.0 km/s
Gliese 54 B
Mass0.3 M☉
Other designations
CD−68°47, Gaia DR2 4704272495284592512, HIP 5496, LHS 1208, 2MASS J01102281-6726425
Database references
SIMBADdata
ARICNSdata

Gliese 54 is a red dwarf of spectral type M2 with an effective temperature of 4250 K.[6] In the SIMBAD database it appears listed as variable star, getting the provisional variable designation NSV 427.[5] 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.[7]

The known stars closer to Gliese 54 are ζ Tucanae, solar analog 3.1 light years, and β Hydri 5.1 light years[8]

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. Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling; Dittmann, Jason; Factor, Samuel; Feiden, Gregory; Martinez, Raquel A.; Ruíz-Rodríguez, Dary; Chia Thao, Pa (2019), "How to constrain your M dwarf. II. The Mass-Luminosity-Metallicity relation from 0.075 to 0.70 solar masses", The Astrophysical Journal, 871 (1): 63, arXiv:1811.06938, Bibcode:2019ApJ...871...63M, doi:10.3847/1538-4357/aaf3bc, S2CID 119372932
  4. Henry, Todd J.; Jao, Wei-Chun; Winters, Jennifer G.; Dieterich, Sergio B.; Finch, Charlie T.; Ianna, Philip A.; Riedel, Adric R.; Silverstein, Michele L.; Subasavage, John P.; Vrijmoet, Eliot Halley (2018), "The Solar Neighborhood XLIV: RECONS Discoveries within 10 Parsecs", The Astronomical Journal, 155 (6): 265, arXiv:1804.07377, Bibcode:2018AJ....155..265H, doi:10.3847/1538-3881/aac262, S2CID 53983430
  5. "CD-68 47". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 May 2017.
  6. 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. S2CID 16238033. pp. 507-512 (Table consulted on CDS).
  7. 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. S2CID 12310839.
  8. Stars Within 15 light-years of Cape Photographic Durchmusterung -68 ° 41 (The Internet Stellar Database)
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