| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| Constellation | Cetus[2] |
| Right ascension | 00h 06m 43.19732s[3] |
| Declination | −07° 32′ 17.0191″[3] |
| Apparent magnitude (V) | 13.837±0.003[4] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M5.5V[4] |
| Apparent magnitude (V) | 13.837±0.003[4] |
| Apparent magnitude (G) | 11.774±0.003[3] |
| Apparent magnitude (J) | 8.323±0.019[4] |
| Apparent magnitude (H) | 7.792±0.034[5] |
| Apparent magnitude (K) | 7.439±0.021[5] |
| Astrometry | |
| Radial velocity (Rv) | −40.46±0.30[3] km/s |
| Proper motion (μ) | RA: −811.566mas/yr[3] Dec.: −1893.251mas/yr[3] |
| Parallax (π) | 206.3500±0.0474 mas[3] |
| Distance | 15.806 ± 0.004 ly (4.846 ± 0.001 pc) |
| Details[4] | |
| Mass | 0.120±0.010 M☉ |
| Radius | 0.137±0.005 R☉ |
| Luminosity (bolometric) | 0.001406±0.000019 L☉ |
| Surface gravity (log g) | 5.10±0.06 cgs |
| Temperature | 3024±52 K |
| Metallicity[Fe/H] | −0.25±0.19 dex |
| Rotation | 161.28±2.93[6] days |
| Other designations | |
| NSV 15022,GJ 1002,G 158-27,LHS 2,NLTT 248,PLX 9.01,PM 00042-0747,TIC 176287658,2MASS J00064325-0732147[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
GJ 1002, orLHS 2, is a nearbyred dwarf star, located 15.8light-years (4.8parsecs) away from theSolar System in the constellation ofCetus. At anapparent magnitude of 13.8, it is much too faint to be visible to thenaked eye. It hosts a system of two knownexoplanets.
With aspectral type of M5.5V, this star is a red dwarf similar toProxima Centauri. It has 12% the mass and 14% the radius of theSun, and a temperature of 3,024 K (2,751 °C; 4,984 °F).[4] It is a slowly rotating star with a low level ofmagnetic activity.[7] Prior to the discovery of planets, it was an object of interest for the study of molecular features in itsspectrum.[7][8]
Two planetary companions to GJ 1002 were discovered in 2022 viaradial velocity. Both haveminimum masses close to that of Earth and orbit within thehabitable zone of their star. While these planets do nottransit their host star, it may be possible to determine the presence and composition of atmospheres with future instruments such as the ANDES spectrograph for theExtremely Large Telescope.[4]
As of 2023[update], GJ 1002 b & c are the fourth- and fifth-closest known Earth-mass exoplanets within the conservatively defined habitable zone, afterProxima Centauri b,GJ 1061 d, andTeegarden's Star c, and followed byWolf 1069 b.[9]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.08±0.13 M🜨 | 0.0457±0.0013 | 10.3465±0.027 | — | — | — |
| c | ≥1.36±0.17 M🜨 | 0.0738±0.0021 | 21.202±0.013 | — | — | — |
