47 Ursae Majoris
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 59m 27.97s |
| Declination | +40° 25′ 48.9″ |
| Apparent magnitude (V) | +5.03 |
| Characteristics | |
| Spectral type | G1V |
| U−B color index | 0.13 |
| B−V color index | 0.61 |
| Astrometry | |
| Radial velocity (Rv) | +12.6 km/s |
| Proper motion (μ) |
RA: –317.01 ± 0.22 mas/yr Dec.: 54.64 ± 0.20 mas/yr |
| Parallax (π) | 71.11 ± 0.25mas |
| Distance | 45.9 ± 0.2 ly (14.06 ± 0.05 pc) |
| Absolute magnitude (MV) | 4.41 |
| Details | |
| Mass | 1.08 M☉ |
| Radius | 1.172 ± 0.111 R☉ |
| Luminosity | 1.48 L☉ |
| Surface gravity (log g) | 4.377 cgs |
| Temperature | 5887 ± 3.8 K |
| Metallicity | 110% solar |
| Rotational velocity (v sin i) | 2.80 km/s |
| Age | 6.03 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | The star |
| planet b | |
| planet c | |
| planet d | |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia |
data |
47 Ursae Majoris (abbreviated 47 UMa), also named Chalawan (Thai: ชาละวัน, pronounced [t͡ɕʰāː.lā.wān]), is a yellow dwarf star approximately 46 light-years from Earth in the constellation of Ursa Major. As of 2011[update], three extrasolar planets (designated 47 Ursae Majoris b, c and d; the first two later named Taphao Thong and Taphao Kaew) are believed to orbit the star.
The star is located fairly close to the Solar System: according to astrometric measurements made by the Hipparcos astrometry satellite, it exhibits a parallax of 71.11 milliarcseconds, corresponding to a distance of 45.913 light-years. With an apparent magnitude of +5.03, it is visible to the naked eye and its absolute magnitude of +4.29 implies a visual luminosity around 60% greater than the Sun. A solar analog, with a spectral type of G1V, it has a similar mass to that of the Sun but is slightly hotter at around 5,882 K. and slightly more metal-rich with around 110% of the solar abundance of iron.
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