47 Ursae Majoris b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | 47 Ursae Majoris | |
| Constellation | Ursa Major | |
| Right ascension | (α) | 10h 59m 28.0s |
| Declination | (δ) | +40° 25′ 49″ |
| Apparent magnitude | (mV) | 5.03 |
| Distance | 45.9 ly (14.06 pc) |
|
| Spectral type | G1V | |
| Mass | (m) | 1.08 M☉ |
| Radius | (r) | 1.172 ± 0.111 R☉ |
| Temperature | (T) | 5887 ± 3.8 K |
| Metallicity | [Fe/H] | 0.04 |
| Age | 6.03 Gyr | |
| Orbital elements | ||
| Semi-major axis | (a) | 2.10 ± 0.02AU (~314 Gm) |
| ~14.9 mas | ||
| Periastron | (q) | 2.03 ± 0.05 AU (~304 Gm) |
| Apastron | (Q) | 2.17 ± 0.05 AU (~324 Gm) |
| Eccentricity | (e) | 0.032 ± 0.014 |
| Orbital period | (P) | 1078 ± 2d (~2.95 y) |
| Orbital speed | (υ) | 21.3 ± 0.3 km/s |
| Argument of periastron |
(ω) | 334 ± 23° |
| Time of periastron | (T0) | 2,451,917+63 −76JD |
| Semi-amplitude | (K) | 49.00 ± 0.87m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 2.53+0.07 −0.06MJ |
| Stellar flux | (F⊙) | 0.33 ⊕ |
| Temperature | (T) | 200 |
| Discovery information | ||
| Discovery date | 17 January 1996 | |
| Discoverer(s) |
Marcy and Butler et al. |
|
| Discovery method | Doppler spectroscopy | |
| Discovery site |
 United States
|
|
| Discovery status | Confirmed | |
| Other designations | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
47 Ursae Majoris b (abbreviated 47 UMa b), also named Taphao Thong (Thai: ตะเภาทอง, rtgs: Taphaothong, pronounced [tā.pʰāw.tʰɔ̄ːŋ]), is an extrasolar planet approximately 46 light-years from Earth in the constellation of Ursa Major. The planet was discovered located in a long-period orbit around the star 47 Ursae Majoris in January 1996 and as of 2011 it is the innermost of three known planets in its planetary system. It has a mass at least 2.53 times that of Jupiter.
In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Taphao Thong for this planet. The winning name was submitted by the Thai Astronomical Society of Thailand. Taphaothong was one of two sisters associated with a Thai folk tale.
Like the majority of known extrasolar planets, Taphao Thong was discovered by detecting the changes in its star's radial velocity as the planet's gravity pulls the star around. This was achieved by observing the Doppler shift of the spectrum of Chalawan. After the discovery of the first extrasolar planet around a Sun-like star, Dimidium, astronomers Geoffrey Marcy and R. Paul Butler searched through their observational data for signs of extrasolar planets and soon discovered two: Taphao Thong and 70 Virginis b. The discovery of Taphao Thong was announced in 1996.
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