47 Ursae Majoris b
47 Ursae Majoris b (abbreviated 47 UMa b), formally named Taphao Thong /təˌpaʊ ˈtɒŋ/, is a gas planet and 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.
An artist's impression of 47 Ursae Majoris b, depicting it as a Jovian-like planet | |
| Discovery | |
|---|---|
| Discovered by | Marcy and Butler et al. |
| Discovery site | United States |
| Discovery date | 17 January 1996 |
| Doppler spectroscopy | |
| Orbital characteristics | |
| Apastron | 2.17 ± 0.05 AU (324.6 ± 7.5 million km) |
| Periastron | 2.03 ± 0.05 AU (303.7 ± 7.5 million km) |
| 2.10 ± 0.02 AU (314.2 ± 3.0 million km) | |
| Eccentricity | 0.032 ± 0.014 |
| 1,078 ± 2 d ~2.95 y | |
Average orbital speed | 21.3 ± 0.3 |
| 2,451,917+63 −76 | |
| 334 ± 23 | |
| Semi-amplitude | 49.00 ± 0.87 |
| Star | 47 Ursae Majoris |
| Physical characteristics | |
| Temperature | 200 K |
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