Gliese 433
Gliese 433 is a dim red dwarf star with multiple exoplanetary companions, located in the equatorial constellation of Hydra. The system is located at a distance of 29.6 light-years from the Sun based on parallax measurements, and it is receding with a radial velocity of +18 km/s. Based on its motion through space, this is an old disk star. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 9.81 and an absolute magnitude of 10.07.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 35m 26.94777s |
| Declination | −32° 32′ 23.8842″ |
| Apparent magnitude (V) | 9.81 |
| Characteristics | |
| Spectral type | M2V |
| Apparent magnitude (U) | 12.508 |
| Apparent magnitude (B) | 11.299 |
| Apparent magnitude (R) | 8.82 |
| Apparent magnitude (I) | 7.664 |
| Apparent magnitude (J) | 6.471 |
| Apparent magnitude (H) | 5.856±0.036 |
| Apparent magnitude (K) | 5.623±0.021 |
| U−B color index | 1.23 |
| B−V color index | 1.489±0.004 |
| V−R color index | 0.99 |
| R−I color index | 1.16 |
| Astrometry | |
| Radial velocity (Rv) | +17.986±0.0006 km/s |
| Proper motion (μ) | RA: −71.060±0.020 mas/yr Dec.: −850.592±0.016 mas/yr |
| Parallax (π) | 110.1711 ± 0.0204 mas |
| Distance | 29.605 ± 0.005 ly (9.077 ± 0.002 pc) |
| Absolute magnitude (MV) | 10.07 |
| Details | |
| Mass | 0.48 M☉ |
| Radius | 0.529±0.021 R☉ |
| Luminosity | 0.034 L☉ |
| Habitable zone inner limit | 0.186 AU |
| Habitable zone outer limit | 0.362 AU |
| Surface gravity (log g) | 4.81±0.14 cgs |
| Temperature | 3,445±50 K |
| Metallicity [Fe/H] | −0.02±0.05 dex |
| Rotation | 73.2±16.0 d |
| Rotational velocity (v sin i) | 1.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
This is a small M-type main-sequence star with a stellar classification of M2V. It is an older star with a rotation period of roughly 73 days and a below average activity level for stars of its mass. The star has 48% of the mass and 53% of the radius of the Sun. It is radiating just 3.4% of the luminosity of the Sun from its photosphere at an effective temperature of 3,445 K.