Discovery | |
---|---|
Discovered by | Bruce Campbell, Gordon Walker, Stephenson Yang,[1] Hatzes et al. |
Discovery site | United States |
Discovery date | 13 July 1988 (suspected) 7 May 2003 (confirmed) |
Doppler spectroscopy | |
Orbital characteristics | |
2.05±0.06 AU | |
Eccentricity | 0.049±0.034[2] |
903.3±1.5[2] d | |
2,453,227±87[2] | |
94.6±34.6[2] | |
Semi-amplitude | 27.5 ± 1.5 |
Star | γ Cephei A |
Physical characteristics | |
Mass | 9.4+0.7 −1.1 MJ[3] |
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).
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