HD 87822

Last updated
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]
Distance 200 ± 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]
Distance 203.6 ± 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
Mass 1.45 [10]   M☉
Surface gravity (log g)4.18 [6]   cgs
Temperature 6,533 [6]   K
Metallicity [Fe/H]0.10 [6]   dex
Rotational velocity (v sin i)8 [11]  km/s
Age 1.6 [2]   Gyr
B
Mass 1.38 [10]   M☉
C
Mass 0.53 [10]   M☉
Radius 0.53 [5]   R☉
Luminosity 0.04 [5]   L☉
Surface gravity (log g)4.71 [5]   cgs
Temperature 3,610 [5]   K
Metallicity [Fe/H]−0.31 [12]   dex
Other designations
BD+32°1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBAD data

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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