Gliese 829

Short description: Star system in the constellation Pegasus

Gliese 829  Observation data
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)| 147.4958 ± 0.0257[5] mas
Distance| 22.113 ± 0.004 ly
(6.780 ± 0.001 pc)
Orbit[6]
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[7] dex
Other designations

HIP 106106, Ross 775.[8]

Database references
SIMBAD| data
ARICNS| data

Gliese 829 is a double-lined spectroscopic binary[6] 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°.[9] 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]

## 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

1. ↑ 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. ↑ 2.0 2.1 2.2 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.
3. ↑ 3.0 3.1 3.2 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.
4. ↑ 4.0 4.1 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.
5. ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
6. ↑ 6.0 6.1 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.
7. ↑ 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.
8. ↑ "Ross 775". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Ross+775.
9. ↑ 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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*[RA:]: Right Ascension
*[Dec.:]: Declination