Astronomy:HD 87822
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Short description: Binary star system in the constellation Leo Minor
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|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[1] mas |
| 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[4] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 2.3 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, doi:10.1051/0004-6361:20077221, Bibcode: 2007A&A...475..519H
- ↑ 3.0 3.1 Malkov, O. Yu. et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics 546: 5, doi:10.1051/0004-6361/201219774, A69, Bibcode: 2012A&A...546A..69M
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 5.3 5.4 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 6.0 6.1 6.2 6.3 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, doi:10.1111/j.1365-2966.2006.11196.x, Bibcode: 2007MNRAS.374..664C
- ↑ 7.0 7.1 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. doi:10.3847/1538-4365/ab3859. Bibcode: 2019ApJS..244....8Z.
- ↑ 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. doi:10.1086/117790. Bibcode: 1996AJ....111..370H.
- ↑ 10.0 10.1 10.2 10.3 Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. Bibcode: 2018ApJS..235....6T.
- ↑ 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 et al. (2022). "Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8". The Astrophysical Journal Supplement Series 260 (2): 45. doi:10.3847/1538-4365/ac6754. Bibcode: 2022ApJS..260...45D.
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