Gamma Cephei Ab
Gamma Cephei Ab (abbreviated γ Cephei Ab, γ Cep Ab), formally named Tadmor /ˈtædmɔːr/, is an exoplanet approximately 45 light-years away in the constellation of Cepheus (the King). The planet was confirmed to be in orbit around Gamma Cephei A in 2003, but was first suspected to exist around 1988 (making this planet arguably the first true exoplanet discovered).
| Discovery | |
|---|---|
| Discovered by | Bruce Campbell, Gordon Walker, Stephenson Yang, Hatzes et al. |
| Discovery site | United States |
| Discovery date | 13 July 1988 (suspected) 7 May 2003 (confirmed) |
Detection method | Doppler spectroscopy |
| Orbital characteristics | |
Semi-major axis | 2.05±0.06 AU |
| Eccentricity | 0.049±0.034 |
Orbital period (sidereal) | 903.3±1.5 d |
| 2,453,227±87 | |
| 94.6±34.6 | |
| Semi-amplitude | 27.5 ± 1.5 |
| Star | γ Cephei A |
| Physical characteristics | |
| Mass | 9.4+0.7 −1.1 MJ |
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