東海增一,是拜耳以拉丁字母ζ命名的一顆恆星[9],它是一顆黃白色調的恆星,位於赤道上的巨蛇座。它的視星等為+4.6等,以肉眼就可以看見[3],根據太空探測器依巴谷衛星測量的視差變化42.4毫角秒的周年視差,它與太陽的距離是77光年,而且正以-50.7公里/秒的徑向速度接近太陽[5]。估計它會在40萬年的時間裡,以最接近的近日點距離25.7 ly(7.88 pc)掠過太陽[10]。
東海增一的年齡大約是24億歲[1],它的光譜類型是F2V [4],表示它是一顆普通的F型主序星。這顆恆星的直徑大約是太陽的2倍,質量是1.4倍,來自外大氣層的有效溫度為6529k,輻射的光度是太陽的6.3倍[1]。它有一個相對較高的旋轉速度,顯示的投影旋轉速度是69公里/秒[6]。
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