HAT-P-23 is aG-type main-sequence star 1192 light-years away. It has a rapid rotation (rotation period equal to 7 days) for its advanced age of 4 billion years, and exhibits a strong starspot activity.[6] The star may be in the process of being spun up by the giant planet on close orbit.[7] The star is enriched in heavy elements, having about 140% amount of metals compared tosolar abundance.
In 2019, the HAT-P-23 star has received a proper nameMoriah and planetHAT-P-23b -Jebus at an internationalNameExoWorlds contest.[8] These names mean the ancient name of the mount at the center of Jerusalem city, and ancient (pre-Roman) name of Jerusalem itself, respectively.
In 2010 atransiting hot Jupiter like planet was detected.[4] It has a measured dayside temperature of 2154±90K.[9] The planet is believed to be on an unstable orbit, and expected to be engulfed by its parent star about 7.5+2.9 −1.8 million years from now,[4] although timing measurements of multiple transits since the discovery have been unable to detect any reduction in the orbital period.[5][10] The planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to 15±22°.[11] The color of planetary atmosphere is grey.[12] The atmosphere is mostly devoid of clouds, and shows tentatively a presence ofTitanium(II) oxide.[13]
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