Astronomy:Gliese 829
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Short description: Star system in the constellation Pegasus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 21h 29m 36.81197s[2] |
| Declination | +17° 38′ 35.8655″[2] |
| Apparent magnitude (V) | 10.35[3] |
| Characteristics | |
| Spectral type | M3.0Ve[4] |
| U−B color index | +1.31[3] |
| B−V color index | +1.61[3] |
| Astrometry | |
| Radial velocity (Rv) | −25.0[5] km/s |
| Proper motion (μ) | RA: +1007.040[2] mas/yr Dec.: +378.400[2] mas/yr |
| Parallax (π) | 147.4958 ± 0.0257[2] mas |
| Distance | 22.113 ± 0.004 ly (6.780 ± 0.001 pc) |
| Absolute magnitude (MV) | +11.20[6] |
| Orbit[7] | |
| 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[4] cgs |
| Temperature | 3,400[4] K |
| Metallicity [Fe/H] | −0.13[8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Gliese 829 is a double-lined spectroscopic binary[7] 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°.[10] Based upon parallax measurements, the stars are at a distance of 22.1 light-years from the Sun.[2] 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).[5]
Characteristics
The primary star has a temperature of 3400 K.[4] 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 apparent magnitude of 10.35.[3]
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 3.3 Ianna, P. A.; Whitman, W. R. (April 1984), "Parallaxes and proper motions from the McCormick Observatory List 45", Astronomical Journal 89: 568–570, doi:10.1086/113550, Bibcode: 1984AJ.....89..568I.
- ↑ 4.0 4.1 4.2 4.3 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, doi:10.1088/0004-6256/145/4/102, Bibcode: 2013AJ....145..102L.
- ↑ 5.0 5.1 Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics 575: 13, doi:10.1051/0004-6361/201425221, A35, Bibcode: 2015A&A...575A..35B.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 7.0 7.1 Delfosse, Xavier et al. (April 1999), "New neighbours. I. 13 new companions to nearby M dwarfs", Astronomy and Astrophysics 344: 897–910, 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". The Astrophysical Journal 748 (2): 93. doi:10.1088/0004-637X/748/2/93. Bibcode: 2012ApJ...748...93R. http://authors.library.caltech.edu/31363/1/RojasAyala2012p18033Astrophys_J.pdf. Retrieved 2018-09-29.
- ↑ "Ross 775". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Ross+775.
- ↑ 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, doi:10.1086/427790, Bibcode: 2005PASP..117....1D.
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