Gliese 436
Gliese 436 is a red dwarf located 31.9 light-years (9.8 parsecs) away in the zodiac constellation of Leo. It has an apparent visual magnitude of 10.67, which is much too faint to be seen with the naked eye. However, it can be viewed with even a modest telescope of 2.4 in (6 cm) aperture. In 2004, the existence of an extrasolar planet, Gliese 436 b, was verified as orbiting the star. This planet was later discovered to transit its host star.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 42m 11.09334s |
| Declination | +26° 42′ 23.6508″ |
| Apparent magnitude (V) | 10.67 |
| Characteristics | |
| Spectral type | M2.5 V |
| Apparent magnitude (B) | ~12.20 |
| Apparent magnitude (V) | ~10.68 |
| Apparent magnitude (J) | 6.900 ± 0.024 |
| Apparent magnitude (H) | 6.319 ± 0.023 |
| Apparent magnitude (K) | 6.073 ± 0.016 |
| U−B color index | +1.23 |
| B−V color index | +1.52 |
| Astrometry | |
| Radial velocity (Rv) | +8.87±0.16 km/s |
| Proper motion (μ) | RA: 895.088(26) mas/yr Dec.: −813.550(25) mas/yr |
| Parallax (π) | 102.3014 ± 0.0302 mas |
| Distance | 31.882 ± 0.009 ly (9.775 ± 0.003 pc) |
| Absolute magnitude (MV) | 10.63 |
| Details | |
| Mass | 0.425±0.009 M☉ |
| Radius | 0.432±0.011 R☉ |
| Luminosity | 0.02463±0.00029 L☉ |
| Surface gravity (log g) | 4.833±0.013 cgs |
| Temperature | 3,477+46 −44 K |
| Metallicity [Fe/H] | -0.46+0.31 −0.24 dex |
| Rotation | 39.9±0.8 d |
| Rotational velocity (v sin i) | 1.0 km/s |
| Age | 7.41–11.05 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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