HD 87822
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 08m 15.88717s[1] |
| Declination | +31° 36′ 14.5875″[1] |
| Apparent magnitude (V) | 6.240[2] (6.90 + 7.20)[3] |
| Characteristics | |
| Spectral type | F4V[4] |
| U−B color index | +0.01[5] |
| B−V color index | +0.445[5] |
| Astrometry | |
| 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] |
| Orbit[6] | |
| 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 | |
| Surface gravity (log g) | 4.18[4] cgs |
| Temperature | 6,533[4] K |
| Metallicity [Fe/H] | 0.10[4] dex |
| Rotational velocity (v sin i) | 8[7] km/s |
| Age | 1.6[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 87822 is a binary star in the northern constellation of Leo Minor. The 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
- ^ 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
- ^ 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 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
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ 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
- ^ 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.
- ^ 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.
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