Gliese 412
Gliese 412 is a pair of stars that share a common proper motion through space and are thought to form a binary star system. The pair have an angular separation of 31.4″ at a position angle of 126.1°. They are located 15.8 light-years distant from the Sun in the constellation Ursa Major. Both components are relatively dim red dwarf stars.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Gliese 412 A | |
| Right ascension | 11h 05m 22.3101s |
| Declination | +43° 31′ 51.0404″ |
| Apparent magnitude (V) | 8.68 |
| Gliese 412 B | |
| Right ascension | 11h 05m 30.8856s |
| Declination | +43° 31′ 17.8843″ |
| Apparent magnitude (V) | 14.45 |
| Characteristics | |
| Spectral type | M1.0V/M6.0V |
| U−B color index | +1.16/— |
| B−V color index | +1.54/2.08 |
| Astrometry | |
| Gliese 412 A | |
| Radial velocity (Rv) | +64.9 ± 0.9 km/s |
| Proper motion (μ) | RA: −4410.43±0.78 mas/yr Dec.: 942.93±0.70 mas/yr |
| Parallax (π) | 203.8876 ± 0.0332 mas |
| Distance | 15.997 ± 0.003 ly (4.9047 ± 0.0008 pc) |
| Absolute magnitude (MV) | 10.34 |
| Gliese 412 B | |
| Proper motion (μ) | RA: −4339.891±0.167 mas/yr Dec.: 960.780±0.162 mas/yr |
| Parallax (π) | 203.8323 ± 0.0500 mas |
| Distance | 16.001 ± 0.004 ly (4.906 ± 0.001 pc) |
| Absolute magnitude (MV) | 16.05 |
| Details | |
| GJ 412 A | |
| Mass | 0.48 M☉ |
| Radius | 0.38 R☉ |
| Surface gravity (log g) | 4.90 cgs |
| Temperature | 3,687/ K |
| Metallicity [Fe/H] | -0.43 dex |
| Rotational velocity (v sin i) | <3 km/s |
| Age | 3 Gyr |
| GJ 412 B | |
| Mass | 0.10 M☉ |
| Radius | 0.13 R☉ |
| Temperature | 2,700 K |
| Metallicity [Fe/H] | −0.32 dex |
| Rotational velocity (v sin i) | 7.7±1.7 km/s |
| Other designations | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
Gliese 412 Location of Gliese 412 in the constellation Ursa Major | |
The two stellar components of this system have a projected separation of about 152 AU, and an estimated orbital semimajor axis of 190 AU. The primary has about 48% of the Sun's mass, while the secondary is only 10%. The primary has a projected rotation velocity at the equator of less than 3 km/s; the secondary has a rotation velocity of 7.7±1.7 km/s.
The primary star was monitored for radial velocity (RV) variations caused by a Jupiter-mass companion in a short-period orbit. It displayed no significant excess of RV variation that could be attributed to a planet. A search of the system using near-infrared speckle interferometry also failed to detect a companion orbiting at distances of 1–10 AU. Nor has a brown dwarf been detected orbiting within this system.
The space velocity components of this system are U = 141, V = –7 and W = 7. They are members of the halo population of the Milky Way galaxy.