Gliese 588
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 32m 12.93186s[1] |
| Declination | −41° 16′ 32.1081″[1] |
| Apparent magnitude (V) | 9.311 |
| Characteristics | |
| Spectral type | M2.5V[2] |
| U−B color index | +1.14[3] |
| B−V color index | +1.51[3] |
| Astrometry | |
| Radial velocity (Rv) | 15.50 km/s |
| Proper motion (μ) | RA: -1176.447[4] mas/yr Dec.: -1030.9703[4] mas/yr |
| Parallax (π) | 168.9965 ± 0.0270[4] mas |
| Distance | 19.300 ± 0.003 ly (5.9173 ± 0.0009 pc) |
| Absolute magnitude (MV) | 10.44[5] |
| Details[6] | |
| Mass | 0.43±0.05 M☉ |
| Radius | 0.42±0.03 R☉ |
| Surface gravity (log g) | 4.82±0.08 cgs |
| Temperature | 3555±41 K |
| Metallicity [Fe/H] | 0.06±0.08 dex |
| Rotation | 61.3±6.5 d[7] |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gliese 588 is a nearby red dwarf star of spectral type M2.5, located in the constellation Lupus at 19.34 light-years from Earth.[1] It emits a very stable light flux, with no detectable pulsations.[6]
History of observations[]
According to Luyten's (1979) (catalogue LHS, as well as NLTT), this object was discovered by Innes.[8][9] In 1903–1927 Innes was the director of the Union Observatory (UO), South Africa.
However, in the Ci 20 catalogue (see number 934) this star was designated as "CD -40 7021", not "UO".[10] This may indicate that GJ 588 was first catalogued earlier, in the Cordoba Durchmusterung by John M. Thome in 1894.[11][12] Note: the real CD designation of Gliese 588 is "CD-40 9712",[13] not "CD -40 7021":[10] GJ 588 has a RA of 15 hours, but the real CD -40 7021 has a RA of 11 hours.[14][11]
Planetary system[]
On 11 June 2019 two planets were detected by radial velocity around Gliese 588 among other 118 planets around M dwarf stars.[15]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| (unconfirmed) | 2.4+1.0 −0.9 M |