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
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. 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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