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
Distance	200 ± 5 ly ; (61 ± 2 pc)
Absolute magnitude (MV)	2.23[2]
Orbit[6]
Period (P)	17.765 ± 0.036 yr
Semi-major axis (a)	0.1560 ± 0.0005″
Eccentricity (e)	0.3960 ± 0.0038
Inclination (i)	84.59 ± 0.20°
Longitude of the node (Ω)	349.57 ± 0.15°
Periastron epoch (T)	B 1989.133 ± 0.042
Argument of periastron (ω); (secondary)	7.73 ± 0.95°
Details
Surface gravity (log g)	4.18[4] cgs
Temperature	6,533[4] K
Metallicity [Fe/H]	0.10[4] dex
Rotational velocity (v sin i)	8[7] km/s
Age	1.6[2] Gyr
Other designations
	BD+32° 1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBAD	data

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

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
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
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
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
Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
Hartkopf, William I.; Mason, Brian D.; McAlister, Harold A. (1996). "Binary Star Orbits From Speckle Interferometry. VIII. Orbits of 37 Close Visual System". Astronomical Journal. 111: 370. Bibcode:1996AJ....111..370H. doi:10.1086/117790.
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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[van_Leeuwen2007-1] 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

[aa475_519-2] 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

[aa546_A69_5-3] 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

[mnras374_2_664-4] 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

[MERMILLIOD-5] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M

[Hartkopf-6] Hartkopf, William I.; Mason, Brian D.; McAlister, Harold A. (1996). "Binary Star Orbits From Speckle Interferometry. VIII. Orbits of 37 Close Visual System". Astronomical Journal. 111: 370. Bibcode:1996AJ....111..370H. doi:10.1086/117790.

[uesugi_fukuda70-7] 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.