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Gliese 54
Observation data; Epoch J2000 Equinox J2000
Constellation	Tucana
Right ascension	01h 10m 22.8809s
Declination	−67° 26′ 41.9487″
Apparent magnitude (V)	9.80
Characteristics
Spectral type	M2.5 (composite)
Astrometry
Proper motion (μ)	RA: 386.2±0.2 mas/yr ; Dec.: 579.7±0.1 mas/yr
Parallax (π)	126.9 ± 0.4 mas
Distance	25.70 ± 0.08 ly ; (7.88 ± 0.02 pc)
Absolute magnitude (MV)	+10.23
Orbit
Primary	Gliese 54 A
Companion	Gliese 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
Gliese 54 A
Mass	0.43 M☉
Radius	0.51 R☉
Temperature	4250 K
Metallicity	0.17
Rotational velocity (v sin i)	-15.0 km/s
Gliese 54 B
Mass	0.3 M☉
Other designations
	CD−68°47, Gaia DR2 4704272495284592512, HIP 5496, LHS 1208, 2MASS J01102281-6726425
Database references
SIMBAD	data
ARICNS	data

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 of brightness to be observable to the naked eye with an apparent magnitude of +9.80.^[5]

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 a 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 closest stars to Gliese 54 are Zeta Tucanae, a solar analog 3.1 light-years from it, and Beta Hydri, 5.1 light-years from it.^[8]

References

^ ^a ^b 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.
^ ^a ^b ^c ^d 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.
^ ^a ^b 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
^ 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
^ ^a ^b ^c "CD-68 47". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 May 2017.
^ 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).
^ 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.
^ Stars Within 15 light-years of Cape Photographic Durchmusterung -68 ° 41 (The Internet Stellar Database)