47 Ursae Majoris c
| 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) | 3.6 ± 0.1AU (~540 Gm) |
| ~260 mas | ||
| Periastron | (q) | 3.3+0.4 −0.3 AU (~490 Gm) |
| Apastron | (Q) | 4.0+0.2 −0.5 AU (~600 Gm) |
| Eccentricity | (e) | 0.098+0.047 −0.096 |
| Orbital period | (P) | 2391+100 −70d (~6.55 y) |
| Orbital speed | (υ) | 16.5+1.1 −1.0 km/s |
| Argument of periastron |
(ω) | 295+114 −160° |
| Time of periastron | (T0) | 2,452,441+628 −825JD |
| Semi-amplitude | (K) | 7.0 ± 2.3m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 0.540+0.066 −0.073MJ |
| Stellar flux | (F⊙) | 0.115 ⊕ |
| Temperature | (T) | 152 |
| Discovery information | ||
| Discovery date | 15 August 2001 19 March 2002 (confirmed) |
|
| Discoverer(s) |
Fischer, Butler, and Marcy et al. |
|
| Discovery method | Doppler spectroscopy | |
| Discovery site |
 United States
|
|
| Discovery status | Confirmed | |
| Other designations | ||
|
Taphao Kaew, 47 UMa c,HD 95128 c
|
||
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
47 Ursae Majoris c (abbreviated 47 UMa c), also named Taphao Kaew (Thai: ตะเภาแก้ว, rtgs: Taphaokaeo, pronounced [tā.pʰāw.kɛ̂ːw]), 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 around the star 47 Ursae Majoris. Its orbit lasts 6.55 years and the planet has a mass at least 0.540 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 Kaew for this planet. The winning name was submitted by the Thai Astronomical Society of Thailand. Taphaokaeo was one of two sisters associated with a Thai folk tale.
Like the majority of known extrasolar planets, 47 Ursae Majoris c was discovered by detecting changes in its star's radial velocity caused by the planet's gravity. This was done by measuring the Doppler shift of the star's spectrum.
At the time of discovery in 2001, 47 Ursae Majoris was already known to host one extrasolar planet, designated 47 Ursae Majoris b. Further measurements of the radial velocity revealed another periodicity in the data unaccounted for by the first planet. This periodicity could be explained by assuming that a second planet, designated 47 Ursae Majoris c, existed in the system with an orbital period close to 7 years. Observations of the photosphere of 47 Ursae Majoris suggested that the periodicity could not be explained by stellar activity, making the planet interpretation more likely. The planet was announced in 2002.
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