HD 87822

HD 87822
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
Right ascension 10h 08m 15.88717s[1]
Declination +31° 36 14.5875[1]
Apparent magnitude (V) 6.240[2] (6.90 + 7.20)[3]
Characteristics
Spectral type F4V[4]
U−B color index +0.01[5]
B−V color index +0.445[5]
Astrometry
Radial velocity (Rv)−8.0[2] km/s
Proper motion (μ) RA: −80.47[1] mas/yr
Dec.: −92.07[1] mas/yr
Parallax (π)16.33 ± 0.42[1] mas
Distance200 ± 5 ly
(61 ± 2 pc)
Absolute magnitude (MV)2.23[2]
Orbit[3]
Period (P)17.765 yr
Semi-major axis (a)0.1560"
Eccentricity (e)0.3960
Details
Surface gravity (log g)4.18[4] cgs
Temperature6,533[4] K
Metallicity [Fe/H]0.10[4] dex
Rotational velocity (v sin i)8[6] km/s
Age1.6[2] Gyr
Other designations
BD+32° 1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBADdata

HD 87822 is a binary star in the northern constellation of Leo Minor. The pair orbit each other with a period of about 18 years.[3]

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
  2. 1 2 3 4 Holmberg, J.; et al. (2007), "The Geneva-Copenhagen survey of the Solar neighbourhood. II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk", Astronomy & Astrophysics 475 (2): 519−537, arXiv:0707.1891, Bibcode:2007A&A...475..519H, doi:10.1051/0004-6361:20077221
  3. 1 2 3 Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. 1 2 3 4 Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x
  5. 1 2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
  6. Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto). Bibcode:1970crvs.book.....U.
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