HD 87822

HD 87822
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo Minor
	AB
Right ascension	10h 08m 15.88717s
Declination	+31° 36′ 14.5875″
Apparent magnitude (V)	6.240 (6.90 + 7.20)
	C
Right ascension	10h 08m 16.16565s
Declination	+31° 35′ 47.1421″
Apparent magnitude (V)	13.8
Characteristics
AB
Spectral type	F4V
U−B color index	+0.01
B−V color index	+0.445
C
Spectral type	dMs1.5
Astrometry
AB
Radial velocity (Rv)	−8.0 km/s
Proper motion (μ)	RA: −80.47 mas/yr ; Dec.: −92.07 mas/yr
Parallax (π)	16.33 ± 0.42 mas
Distance	200 ± 5 ly ; (61 ± 2 pc)
Absolute magnitude (MV)	2.23
C
Radial velocity (Rv)	−5.77 km/s
Proper motion (μ)	RA: −80.484 mas/yr ; Dec.: −87.851 mas/yr
Parallax (π)	16.0212 ± 0.0186 mas
Distance	203.6 ± 0.2 ly ; (62.42 ± 0.07 pc)
Orbit
Primary	A
Companion	B
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 M☉
Surface gravity (log g)	4.18 cgs
Temperature	6,533 K
Metallicity [Fe/H]	0.10 dex
Rotational velocity (v sin i)	8 km/s
Age	1.6 Gyr
B
Mass	1.38 M☉
C
Mass	0.53 M☉
Radius	0.53 R☉
Luminosity	0.04 L☉
Surface gravity (log g)	4.71 cgs
Temperature	3,610 K
Metallicity [Fe/H]	−0.31 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

^ ^a ^b ^c ^d ^e 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
^ ^a ^b ^c ^d 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
^ ^a ^b 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
^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c ^d 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
^ ^a ^b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
^ 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.
^ 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.
^ ^a ^b ^c ^d 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.
^ 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.
^ 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.

This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it.

[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, S2CID 18759600

[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, S2CID 119054949

[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

[dr3c-4] ^ ^a ^b ^c ^d ^e ^f 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.

[ticv8-5] 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.

[mnras374_2_664-6] 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

[MERMILLIOD-7] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M

[zhong2019-8] 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.

[Hartkopf-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.

[msc-10] 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.

[uesugi_fukuda70-11] 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.

[ding2022-12] 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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Observation data Epoch J2000 Equinox J2000
Constellation	Leo Minor
AB
Right ascension	10^h 08^m 15.88717^s^[1]
Declination	+31° 36′ 14.5875″^[1]
Apparent magnitude (V)	6.240^[2] (6.90 + 7.20)^[3]
C
Right ascension	10^h 08^m 16.16565^s^[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 (R_v)	−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 (M_V)	2.23^[2]
C
Radial velocity (R_v)	−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]
Primary	A
Companion	B
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

References

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