Lambda Coronae Borealis

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Lambda Coronae Borealis
Observation data
Epoch J2000      Equinox
Constellation Corona Borealis
Right ascension 15h 55m 47.58679s[1]
Declination +37° 56′ 49.0491″[1]
Apparent magnitude (V) 5.424[2]
Spectral type F0IV[3]
U−B color index +0.01[4]
B−V color index +0.34[4]
Radial velocity (Rv)-11.60 ± 0.8[5] km/s
Proper motion (μ) RA: 29.28[1] mas/yr
Dec.: 80.14[1] mas/yr
Parallax (π)24.06 ± 0.24[1] mas
Distance136 ± 1 ly
(41.6 ± 0.4 pc)
Absolute magnitude (MV)2.33[6]
Other designations
λ CrB, 12 Coronae Borealis, GJ 9531, HR 5936, HIP 78012, HD 142908
Database references

Lambda Coronae Borealis (λ Coronae Borealis), is a star located in the constellation Corona Borealis. Lambda Coronae Borealis is also known as HR 5936, and HD 142908. The star is located at Right Ascension 15h 55m 47s and Declination 37 deg 56 arcmin 49 arcsec.

Lambda Coronae Borealis is a binary star system, where A and B are separated by 98 arcsec. Lambda Coronae Borealis A is an F0IV subgiant star with an apparent visual magnitude of +5.45, and an absolute visual magnitude of +2.34. Lambda Borealis A has an effective temperature of 7500k and a mass of 1.4 solar masses. Lambda Coronae Borealis B, also known as BD+38 2712B has a visual magnitude of +10.

The system is located at a distance of 41 parsecs, or 135.1 ly


  1. ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. 
  3. ^ "* lam CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 May 2017. 
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. 
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399Freely accessible, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911.