HD 154577

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HD 154577
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 10m 10.35091s[1]
Declination −60° 43′ 43.5757″[1]
Apparent magnitude (V) 7.385[2]
Spectral type K2.5Vk:[3]
U−B color index +0.53[4]
B−V color index +0.89[4]
Radial velocity (Rv) +8.8[5] km/s
Proper motion (μ) RA: 70.96[1] mas/yr
Dec.: 589.86[1] mas/yr
Parallax (π) 73.41 ± 0.70[1] mas
Distance 44.4 ± 0.4 ly
(13.6 ± 0.1 pc)
Absolute magnitude (MV) 6.71[2]
Mass 0.68[6] M
Radius 0.68[7] R
Surface gravity (log g) 4.70[3] cgs
Temperature 4,850[3] K
Metallicity [Fe/H] −0.70[8] dex
Rotational velocity (v sin i) 0.2[9] km/s
Age 3.2[10] Gyr
Other designations
CD-60 6576, GCTP, GJ 656, HD 154577, HIP 83990, LHS 3268, LTT 6833, SAO 253819.[11]

HD 154577 (Gliese 656) is a solar-type star in the southern constellation of Ara. It is a high proper motion star and is located about 44 light years from the Sun. This star has only 68% of the Sun's mass and radius, a effective temperature of 4,850 K and a stellar classification of K2V, which indicates it is a K-type main sequence star. As of 2005, this star is not known to host any planets.[6] No excess of infrared radiation has been detected of the type that would indicate the presence of an orbiting debris disk.[10]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Holmberg, J.; Nordström, B.; Andersen, J. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics Supplement Series. 501 (3): 941–947. arXiv:0811.3982free to read. Bibcode:2009A&A...501..941H. doi:10.1051/0004-6361/200811191.  Note: see VizieR catalogue V/130.
  3. ^ a b c Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770free to read. Bibcode:2006AJ....132..161G. doi:10.1086/504637. 
  4. ^ a b Cousins, A. W. J. (1973). "UBV photometry of some southern stars". Monthly Notes of the Astronomical Society of Southern Africa. 32: 11. Bibcode:1973MNSSA..32...11C. 
  5. ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Retrieved 2009-09-10. 
  6. ^ a b Santos, N. C.; et al. (July 2005). "Spectroscopic metallicities for planet-host stars: Extending the samples". Astronomy and Astrophysics. 437 (3): 1127–1133. arXiv:astro-ph/0504154free to read. Bibcode:2005A&A...437.1127S. doi:10.1051/0004-6361:20052895. 
  7. ^ Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235free to read, Bibcode:2007ApJS..168..297T, doi:10.1086/509763. 
  8. ^ Adibekyan, V. Zh.; et al. (September 2012), "Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program. Galactic stellar populations and planets", Astronomy & Astrophysics, 545: 15, arXiv:1207.2388free to read, Bibcode:2012A&A...545A..32A, doi:10.1051/0004-6361/201219401, A32. 
  9. ^ Valenti, Jeff A.; Fischer, Debra A. (July 2005), "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs", The Astrophysical Journal Supplement Series, 159 (1): 141–166, Bibcode:2005ApJS..159..141V, doi:10.1086/430500. 
  10. ^ a b Lawler, S. M.; et al. (November 2009). "Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars". The Astrophysical Journal. 705 (1): 89–111. arXiv:0909.0058free to read. Bibcode:2009ApJ...705...89L. doi:10.1088/0004-637X/705/1/89. 
  11. ^ "LHS 3268 -- High proper-motion star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-12-06.