Gliese 555

Gliese 555 (HN Librae) is a red dwarf star of spectral type M4.0V, located in constellation Libra at 20.2 light-years from Earth.[14]

GJ 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 16.81183s[2]
Declination −12° 31′ 10.3965″[2]
Apparent magnitude (V) 11.317
Characteristics
Spectral type M4.0V
Variable type BY Dra type
Astrometry
Radial velocity (Rv)-1.45 ± 0.1 km/s
Proper motion (μ) RA: −355.138±0.053[3] mas/yr
Dec.: 593.040±0.043[3] mas/yr
Parallax (π)159.9225 ± 0.0546 mas[3]
Distance20.395 ± 0.007 ly
(6.253 ± 0.002 pc)
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 been detected by radial velocity among other 118 planets around M dwarf stars.[15]

The Gliese 555 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) 30.1 +16.3
−14.6 M🜨		 0.727 +0.061
−0.075		 449.6 +6.8
−5.9		 0.04 +0.27
−0.04		 — —

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. van Leeuwen F. (2007). "HIP 71253". Validation of the new Hipparcos reduction.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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:1906.04644v1 [astro-ph.EP].
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