Gliese 829
Gliese 829 is a double-lined spectroscopic binary[5] system of two red dwarf stars in the constellation of Pegasus. They have a high proper motion of 1.08 arc seconds per year along a position angle of +69.58°.[8] Based upon parallax measurements, the stars are at a distance of about 22 light years from the Sun.[1] The system will make its closest approach to the Sun around 91,000 years from now when it achieves a perihelion distance of 17.65 ly (5.410 pc).[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 29m 36.81225s[1] |
| Declination | +17° 38′ 35.8542″[1] |
| Apparent magnitude (V) | 10.35[2] |
| Characteristics | |
| Spectral type | M3.0Ve[3] |
| U−B color index | +1.31[2] |
| B−V color index | +1.61[2] |
| Astrometry | |
| Radial velocity (Rv) | −25.0[4] km/s |
| Proper motion (μ) | RA: +1007.13[1] mas/yr Dec.: +377.27[1] mas/yr |
| Parallax (π) | 149.15 ± 1.81[1] mas |
| Distance | 21.9 ± 0.3 ly (6.70 ± 0.08 pc) |
| Orbit[5] | |
| Period (P) | 53.221±0.004 d |
| Eccentricity (e) | 0.374±0.004 |
| Periastron epoch (T) | 48980.2±0.2 JD |
| Argument of periastron (ω) (secondary) | 300±1° |
| Semi-amplitude (K1) (primary) | 18.7±0.1 km/s |
| Semi-amplitude (K2) (secondary) | 18.7±0.1 km/s |
| Details | |
| Surface gravity (log g) | 5.0[3] cgs |
| Temperature | 3,400[3] K |
| Metallicity [Fe/H] | −0.13[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Characteristics
The primary star has a temp of 3400 K. It is an M3.0Ve star with a B-V color index of 1.61 and it is also called Ross 775. It has an app. mag. of 10.35.
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.
- Ianna, P. A.; Whitman, W. R. (April 1984), "Parallaxes and proper motions from the McCormick Observatory List 45", Astronomical Journal, 89: 568–570, Bibcode:1984AJ.....89..568I, doi:10.1086/113550.
- Lépine, Sébastien; et al. (2013), "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky", The Astronomical Journal, 145 (4): 102, arXiv:1206.5991, Bibcode:2013AJ....145..102L, doi:10.1088/0004-6256/145/4/102, S2CID 117144290.
- Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.
- Delfosse, X.; et al. (April 1999), "New neighbours. I. 13 new companions to nearby M dwarfs", Astronomy and Astrophysics, 344: 897–910, arXiv:astro-ph/9812008, Bibcode:1999A&A...344..897D.
- Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs" (PDF). The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. S2CID 41902340.
- "Ross 775". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-25.
- Dawson, P. C.; De Robertis, M. M. (January 2005), "High Proper Motion Stars. IV. Radial Velocities of 166 Luyten Half-Second Stars", The Publications of the Astronomical Society of the Pacific, 117 (827): 1–12, Bibcode:2005PASP..117....1D, doi:10.1086/427790.
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