HD 211415

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HD 211415 A/B
Observation data
Epoch J2000      Equinox J2000
Constellation Grus
Right ascension 22h 18m 15.61403s[1]
Declination –53° 37′ 37.4640″[1]
Apparent magnitude (V) 5.33[2]/9.9[3]
Spectral type G0V[4] + MV
U−B color index +0.06[2]
B−V color index +0.61[2]
Radial velocity (Rv) -12.68 ± 0.17[5] km/s
Proper motion (μ) RA: +438.75[1] mas/yr
Dec.: –632.46[1] mas/yr
Parallax (π) 72.54 ± 0.36[1] mas
Distance 45.0 ± 0.2 ly
(13.79 ± 0.07 pc)
Absolute magnitude (MV) 4.69[6]
HD 211415 A
Mass 0.941 ± 0.016[7] M
Surface gravity (log g) 4.42 ± 0.03[7] cgs
Temperature 5864 ± 18[7] K
Metallicity [Fe/H] –0.21 ± 0.01[7] dex
Rotational velocity (v sin i) 0.32[8] km/s
Age 2.6–4.1[9] Gyr
HD 211415 B
Mass 0.59[10] M
Other designations
CD -54°9222, GCTP 5395.00, GJ 853 A, HD 211415, HIP 110109, HR 8501, LHS 3790, LFT 1702, LTT 8943, SAO 247400.[11]
Database references

HD 211415 is a double star in the constellation Grus. It has a relatively high proper motion and is located about 45 light years from the Sun.

As of 1994, the two members of this system have an angular separation of 0.778 along a position angle of 145.9°. This corresponds to an estimated semimajor axis of 57.75 AU.[3] This is larger than the orbit of Pluto around our Sun, which has a semi-major axis of 39.5 AU. This system has not been observed for a sufficient length of time to establish the remaining orbital parameters with sufficient precision.

Possibility of planets and life[edit]

HD 211415 was identified in September 2003 by astrobiologist Margaret Turnbull from the University of Arizona in Tucson as one of the most promising nearby candidates for hosting life based on her analysis of the HabCat list of stars.[12]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data., SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b Poveda, A.; et al. (April 1994), "Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems", Revista Mexicana de Astronomía y Astrofísica, 28 (1): 43–89, Bibcode:1994RMxAA..28...43P.  See pp. 80–81.
  4. ^ Gray, R. O.; et al. (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): 161–70. Bibcode:2006AJ....132..161G. arXiv:astro-ph/0603770Freely accessible. doi:10.1086/504637. 
  5. ^ Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, Bibcode:2010A&A...521A..12M, arXiv:1007.1132Freely accessible, doi:10.1051/0004-6361/201014948 
  6. ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, Bibcode:2009A&A...501..941H, arXiv:0811.3982Freely accessible, doi:10.1051/0004-6361/200811191. 
  7. ^ a b c d Tsantaki, M.; et al. (July 2013), "Deriving precise parameters for cool solar-type stars. Optimizing the iron line list", Astronomy & Astrophysics, 555: A150, Bibcode:2013A&A...555A.150T, arXiv:1304.6639Freely accessible, doi:10.1051/0004-6361/201321103. 
  8. ^ Martínez-Arnáiz, R.; et al. (September 2010). "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter". Astronomy and Astrophysics. 520: A79. Bibcode:2010A&A...520A..79M. arXiv:1002.4391Freely accessible. doi:10.1051/0004-6361/200913725. 
  9. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. arXiv:0807.1686Freely accessible. doi:10.1086/591785. 
  10. ^ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, Bibcode:2014AJ....147...87T, arXiv:1401.6827Freely accessible, doi:10.1088/0004-6256/147/4/87, 87. 
  11. ^ "HD 45088 -- Variable of BY Dra type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2015-04-17. 
  12. ^ "Astronomer Announces Shortlist Of Stellar Candidates For Habitable Worlds". Science Daily. 2006-02-21. Retrieved 2006-05-24. 

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