Gliese 555

Gliese 555 (HN Librae) is a red dwarf star of spectral type M4.0V, located in the constellation Libra at a distance of 20.4 light-years (6.3 parsecs) from Earth.[14]

Gliese 555

A visual band light curve for HN Librae, adapted from Weis (1994)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Libra
Right ascension 14h 34m 16.81166s[2]
Declination −12° 31′ 10.4145″[2]
Apparent magnitude (V) 11.317
Characteristics
Spectral type M4.0V
Variable type BY Dra
Astrometry
Radial velocity (Rv)−1.36±0.20[2] km/s
Proper motion (μ) RA: −355.138 mas/yr[2]
Dec.: 593.040 mas/yr[2]
Parallax (π)159.9225 ± 0.0546 mas[2]
Distance20.395 ± 0.007 ly
(6.253 ± 0.002 pc)
Details
Mass0.291±0.014[3] M☉
Other designations
HN Lib, BD−11 3759[4], GJ 555[5], HIP 71253[6], Ci 20 870[7], LFT 1120, LHS 2945[8], LPM 532, LTT 5759, NLTT 37751[9], PLX 3296[10], PM 14316-1219, Wolf 1481[11], TYC 5572-804-1[12][13], GSC 05572-00804, 2MASS J14341683-1231106
Database references
SIMBADdata
Gliese 555 is located in the constellation Libra
Gliese 555 is located in the constellation Libra
Gliese 555
Location of Gliese 555 in the constellation Libra

Planetary system

In 2019, one planet candidate detected by radial velocity was reported in a preprint, among 118 planets around M dwarf stars. This would have a minimum mass about 30 times that of Earth and orbit with a period of about 450 days.[15] However, a 2023 paper discussing radial velocity observations by the CARMENES survey lists a different planet around this star, citing a discovery paper that has yet to be published as of May 2023. This is a super-Earth with a minimum mass of 2.6 Earths and a period of 36 days.[3]

The Gliese 555 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) ≥2.59±0.34 M🜨 — 36.116+0.027
−0.029		 — — —

References
  1. Weis, Edward W. (March 1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107: 1135–1140. Bibcode:1994AJ....107.1135W. doi:10.1086/116925. Retrieved 20 January 2022.
  2. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  3. Ribas, I.; Reiners, A.; et al. (February 2023). "The CARMENES search for exoplanets around M dwarfs. Guaranteed time observations Data Release 1 (2016-2020)". Astronomy & Astrophysics. 670: A139. arXiv:2302.10528. Bibcode:2023A&A...670A.139R. doi:10.1051/0004-6361/202244879.
  4. Schönfeld, Eduard; et al. (1886). "BD -11 3759". Southern Durchmusterung.
  5. Gliese, W.; Jahreiß, H. (1991). "Gl 555". Preliminary Version of the Third Catalogue of Nearby Stars.
  6. Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.
  7. Porter, J. G.; Yowell, E. J.; Smith, E. S. (1930). "A catalogue of 1474 stars with proper motion exceeding four-tenths year". Publications of the Cincinnati Observatory. 20: 1–32. Bibcode:1930PCinO..20....1P. Page 20 (Ci 20 870).
  8. Luyten, Willem Jacob (1979). "LHS 2945". LHS Catalogue, 2nd Edition.
  9. Luyten, Willem Jacob (1979). "NLTT 37751". NLTT Catalogue.
  10. Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 3296". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
  11. Wolf, M. (1925). "Einige bewegte Sterne in Virgo und Libra". Astronomische Nachrichten. 225 (12): 215–216. Bibcode:1925AN....225R.215W. doi:10.1002/asna.19252251205. Page 215/216 (Wolf 1481)
  12. Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.
  13. Hog; et al. (2000). "TYC 5572-804-1". The Tycho-2 Catalogue.
  14. Jao, Wei-Chun; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer L.; Costa, Edgardo; Méndez, René A. (2005). "The Solar Neighborhood. XIII. Parallax Results from the CTIOPI 0.9 Meter Program: Stars with mu >= 1.0" yr-1 (MOTION Sample)". The Astronomical Journal. 129 (4): 1954–1967. arXiv:astro-ph/0502167. Bibcode:2005AJ....129.1954J. doi:10.1086/428489. S2CID 16164903.
  15. Barnes, J. R.; Kiraga, M.; Diaz, M.; Berdiñas, Z.; Jenkins, J. S.; Keiser, S.; Thompson, I.; Crane, J. D.; Shectman, S. A. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].
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