| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor |
| AB | |
| Right ascension | 10 08 15.88717 |
| Declination | +31° 36′ 14.5875″ |
| Apparent magnitude (V) | 6.240 (6.90 + 7.20) |
| C | |
| Right ascension | 10 08 16.16565 |
| 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 | 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 | −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. The inner pair orbit each other with a period of about 18 years.
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, S2CID 18759600
- ^ 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
- ^ 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
- ^ 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.
- ^ 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.
- ^ 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, 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.
- ^ 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.
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