Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pisces [1] |
Right ascension | 00h 15m 49.24231s [2] |
Declination | +13° 33′ 22.3163″ [2] |
Apparent magnitude (V) | 12.6 [3] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | M4V [4] |
Apparent magnitude (V) | 12.600±0.04 [3] |
Apparent magnitude (R) | 12.296±0.08 [3] |
Apparent magnitude (G) | 11.399±0.003 [2] |
Apparent magnitude (J) | 8.619±0.020 [3] |
Apparent magnitude (H) | 8.068±0.026 [3] |
Apparent magnitude (K) | 7.807±0.020 [3] |
Astrometry | |
Radial velocity (Rv) | 51.04±0.26 [2] km/s |
Proper motion (μ) |
RA: 618.065
mas/
yr
[2] Dec.: 329.446 mas/ yr [2] |
Parallax (π) | 82.1938 ± 0.0326 mas [2] |
Distance | 39.68 ± 0.02
ly (12.166 ± 0.005 pc) |
Details [5] | |
Mass | 0.2414±0.0060 M☉ |
Radius | 0.2617+0.0058 −0.0070 R☉ |
Luminosity (bolometric) | 0.00728±0.00015 L☉ |
Surface gravity (log g) | 5.21±0.07 cgs |
Temperature | 3,296+48 −36 K |
Metallicity [Fe/H] | −0.32±0.06 dex |
Rotation | 85 days |
Rotational velocity (v sin i) | <2 km/s |
Age | 7.0+2.8 −2.2 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Gliese 12 (GJ 12) is a red dwarf star located 39.7 light-years (12.2 parsecs) away in the constellation Pisces. It has about 24% the mass and 26% the radius of the Sun, and a temperature of about 3,296 K (3,023 °C; 5,473 °F). It is an inactive star and hosts one known exoplanet. [5]
The transiting exoplanet Gliese 12 b was discovered by TESS, and two independent studies confirming it as a planet were published in May 2024. [5] [6] Gliese 12 b is similar in size to Earth and Venus, and completes an orbit around its star every 12.8 days. Its mass is poorly constrained but is known to be less than 4 times that of Earth. [5]
Along with the planets of TRAPPIST-1, Gliese 12 b is one of the nearest known relatively temperate transiting exoplanets, and so is a promising target for the James Webb Space Telescope to determine whether it has retained an atmosphere. [7] Gliese 12 b orbits slightly closer than the inner edge of its star's habitable zone, with an insolation between those of Earth and Venus. [6] Its equilibrium temperature, assuming zero albedo, is 315 K (42 °C; 107 °F); if it has an atmosphere, the surface temperature would be greater than this. [5]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | <3.87 M🜨 | 0.0668±0.0024 | 12.761408±0.000050 | <0.50 | 89.194+0.059 −0.052 ° |
0.958+0.046 −0.048 R🜨 |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pisces [1] |
Right ascension | 00h 15m 49.24231s [2] |
Declination | +13° 33′ 22.3163″ [2] |
Apparent magnitude (V) | 12.6 [3] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | M4V [4] |
Apparent magnitude (V) | 12.600±0.04 [3] |
Apparent magnitude (R) | 12.296±0.08 [3] |
Apparent magnitude (G) | 11.399±0.003 [2] |
Apparent magnitude (J) | 8.619±0.020 [3] |
Apparent magnitude (H) | 8.068±0.026 [3] |
Apparent magnitude (K) | 7.807±0.020 [3] |
Astrometry | |
Radial velocity (Rv) | 51.04±0.26 [2] km/s |
Proper motion (μ) |
RA: 618.065
mas/
yr
[2] Dec.: 329.446 mas/ yr [2] |
Parallax (π) | 82.1938 ± 0.0326 mas [2] |
Distance | 39.68 ± 0.02
ly (12.166 ± 0.005 pc) |
Details [5] | |
Mass | 0.2414±0.0060 M☉ |
Radius | 0.2617+0.0058 −0.0070 R☉ |
Luminosity (bolometric) | 0.00728±0.00015 L☉ |
Surface gravity (log g) | 5.21±0.07 cgs |
Temperature | 3,296+48 −36 K |
Metallicity [Fe/H] | −0.32±0.06 dex |
Rotation | 85 days |
Rotational velocity (v sin i) | <2 km/s |
Age | 7.0+2.8 −2.2 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Gliese 12 (GJ 12) is a red dwarf star located 39.7 light-years (12.2 parsecs) away in the constellation Pisces. It has about 24% the mass and 26% the radius of the Sun, and a temperature of about 3,296 K (3,023 °C; 5,473 °F). It is an inactive star and hosts one known exoplanet. [5]
The transiting exoplanet Gliese 12 b was discovered by TESS, and two independent studies confirming it as a planet were published in May 2024. [5] [6] Gliese 12 b is similar in size to Earth and Venus, and completes an orbit around its star every 12.8 days. Its mass is poorly constrained but is known to be less than 4 times that of Earth. [5]
Along with the planets of TRAPPIST-1, Gliese 12 b is one of the nearest known relatively temperate transiting exoplanets, and so is a promising target for the James Webb Space Telescope to determine whether it has retained an atmosphere. [7] Gliese 12 b orbits slightly closer than the inner edge of its star's habitable zone, with an insolation between those of Earth and Venus. [6] Its equilibrium temperature, assuming zero albedo, is 315 K (42 °C; 107 °F); if it has an atmosphere, the surface temperature would be greater than this. [5]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | <3.87 M🜨 | 0.0668±0.0024 | 12.761408±0.000050 | <0.50 | 89.194+0.059 −0.052 ° |
0.958+0.046 −0.048 R🜨 |