Gliese 880
Gliese 880 (GJ 880 / HD 216899)[4] is a red dwarf star in the constellation of Pegasus.
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 56m 34.8048s |
| Declination | 16° 33′ 12.35″ |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M2.0V |
| Apparent magnitude (U) | 11.323 |
| Apparent magnitude (B) | 10.143 |
| Apparent magnitude (V) | 8.638 |
| Apparent magnitude (R) | 7.657 |
| Apparent magnitude (I) | 6.542 |
| Apparent magnitude (J) | 5.360 |
| Apparent magnitude (H) | 4.800 |
| Apparent magnitude (K) | 4.523 |
| Astrometry | |
| Radial velocity (Rv) | -27.44 ± 0.09 km/s |
| Proper motion (μ) | RA: -1034.34 ± 0.97 mas/yr Dec.: -284.09 ± 1.06 mas/yr |
| Parallax (π) | 146.09 ± 1.00 mas |
| Distance | 6.88 ± 5.73−2[1] pc |
| Details[1] | |
| Mass | 0.5860±0.0586 M☉ |
| Radius | 0.689±0.044 R☉ |
| Temperature | 3373 ± 100 K |
| Metallicity [Fe/H] | +0.20±0.05[2] dex |
| Rotation | 37.5±0.1 d[3] |
| Rotational velocity (v sin i) | < 2.8 km/s |
| Database references | |
| SIMBAD | data |
Planetary System
In June 2019 one planet candidate were reported in orbit around Gliese 880. [5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 8.5+5.7 −4.7 M⊕ |
0.187+0.016 −0.020 |
39.372+0.050 −0.059 |
0.13+0.25 −0.13 |
— | — |
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References
- Lopez‐Morales, Mercedes (May 2007). "On the Correlation between the Magnetic Activity Levels, Metallicities, and Radii of Low‐Mass Stars". The Astrophysical Journal. 660 (1): 732–739. arXiv:astro-ph/0701702. Bibcode:2007ApJ...660..732L. doi:10.1086/513142.
- Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604: A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715.
- Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441.
- "Gliese 880". SIMBAD. Retrieved 4 April 2015.
- Barnes, J. R.; et al. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].
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