HD 87822
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
AB
Right ascension 10h 08m 15.88717s[1]
Declination +31° 36′ 14.5875″[1]
Apparent magnitude (V) 6.240[2] (6.90 + 7.20)[3]
C
Right ascension 10h 08m 16.16565s[4]
Declination +31° 35′ 47.1421″[4]
Apparent magnitude (V) 13.8[5]
Characteristics
AB
Spectral type F4V[6]
U−B color index +0.01[7]
B−V color index +0.445[7]
C
Spectral type dMs1.5[8]
Astrometry
AB
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 mas[1]
Distance200 ± 5 ly
(61 ± 2 pc)
Absolute magnitude (MV)2.23[2]
C
Radial velocity (Rv)−5.77[4] km/s
Proper motion (μ) RA: −80.484[4] mas/yr
Dec.: −87.851[4] mas/yr
Parallax (π)16.0212 ± 0.0186 mas[4]
Distance203.6 ± 0.2 ly
(62.42 ± 0.07 pc)
Orbit[9]
PrimaryA
CompanionB
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
A
Mass1.45[10] M☉
Surface gravity (log g)4.18[6] cgs
Temperature6,533[6] K
Metallicity [Fe/H]0.10[6] dex
Rotational velocity (v sin i)8[11] km/s
Age1.6[2] Gyr
B
Mass1.38[10] M☉
C
Mass0.53[10] M☉
Radius0.53[5] R☉
Luminosity0.04[5] L☉
Surface gravity (log g)4.71[5] cgs
Temperature3,610[5] K
Metallicity [Fe/H]−0.31[12] dex
Other designations
BD+32°1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBADdata

HD 87822 is a triple star in the northern constellation of Leo Minor.[10] The inner 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, S2CID 18759600
  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, S2CID 119054949
  3. 1 2 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 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. 1 2 3 4 5 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
  6. 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, S2CID 119428437
  7. 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
  8. ↑ Zhong, Jing; Li, Jing; Carlin, Jeffrey L.; Chen, Li; Mendez, Rene A.; Hou, Jinliang (2019). "Value-added Catalogs of M-type Stars in LAMOST DR5". The Astrophysical Journal Supplement Series. 244 (1): 8. arXiv:1908.01128. Bibcode:2019ApJS..244....8Z. doi:10.3847/1538-4365/ab3859. S2CID 199442518.
  9. ↑ 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.
  10. 1 2 3 4 Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. S2CID 119047709.
  11. ↑ 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.
  12. ↑ Ding, Ming-Yi; Shi, Jian-Rong; Wu, Yue; Jones, Hugh R. A.; Yan, Hong-Liang; Li, Chun-Qian; Gao, Qi; Chen, Tian-Yi; Zhang, Jing-Hua; Liu, Shuai; Yan, Tai-Sheng; Xie, Xiao-Jin (2022). "Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8". The Astrophysical Journal Supplement Series. 260 (2): 45. arXiv:2204.09200. Bibcode:2022ApJS..260...45D. doi:10.3847/1538-4365/ac6754. S2CID 248266451.


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