Gliese 880
Star in the constellation Pegasus
From Wikipedia, the free encyclopedia
Gliese 880 is a red dwarf star 22.4 light-years away in the northern constellation of Pegasus. No stellar companions to Gliese 880 have been discovered as of 2020.[9]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 22h 56m 34.805s[2] |
| Declination | +16° 33′ 12.36″[2] |
| Apparent magnitude (V) | 8.68[1] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | M1.5V[3] |
| Apparent magnitude (B) | 10.187[1] |
| Apparent magnitude (R) | 7.80[1] |
| Apparent magnitude (I) | 7.100[1] |
| Apparent magnitude (J) | 5.360±0.020[1] |
| Apparent magnitude (H) | 4.800±0.036[1] |
| Apparent magnitude (K) | 4.523±0.016[1] |
| B−V color index | 1.507±0.015[1] |
| Astrometry | |
| Radial velocity (Rv) | −27.87±0.13[2] km/s |
| Proper motion (μ) | RA: −1034.733(26) mas/yr[2] Dec.: −284.131(25) mas/yr[2] |
| Parallax (π) | 145.6234±0.0255 mas[2] |
| Distance | 22.397 ± 0.004 ly (6.867 ± 0.001 pc) |
| Absolute magnitude (MV) | 9.50[1] |
| Details[4] | |
| Mass | 0.569 M☉ |
| Radius | 0.548±0.005 R☉ |
| Luminosity | 0.05112±0.00074 L☉ |
| Habitable zone inner limit | 0.218 AU |
| Habitable zone outer limit | 0.435 AU |
| Surface gravity (log g) | 4.77[5] cgs |
| Temperature | 3,713±11 K |
| Metallicity [Fe/H] | +0.20±0.05[6] dex |
| Rotation | 37.5±0.1 d[7] |
| Rotational velocity (v sin i) | 2.07[6] km/s |
| Other designations | |
| BD+15 4733, HD 216899, HIP 113296, Ross 671, 2MASS J22563497+1633130[8] | |
| Database references | |
| SIMBAD | data |
Search for planets
In June 2019, a candidate planet detected by radial velocity in orbit around Gliese 880 was reported in a preprint. This would have a minimum mass about 8.5 times that of Earth and orbit with a period of 39.4 days,[10] which is close to the star's rotation period of 37.5 days.[7] A 2024 study did not detect the exact period of 39.4 days, but detected two radial velocity signals at 37.2 and 40.5 days, which correspond to the stellar rotation and an alias of it. Presumably, the previously claimed planet candidate is an artifact of stellar activity.[11]