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目錄 |
2008年5月彼得·麥卡洛(Peter R. McCullough)以凌日法發現XO-4b。該行星質量是1.72倍木星質量,半徑則是木星的1.34倍。該行星距離其光譜形式F型的母恆星相當近,並且是典型的凌日行星,被認為是熱木星。
XO-4b的軌道週期只有4.125日(99小時),距離母恆星只有約0.0555天文單位[1]。