HAT-P-23
Coordinates: 
20h 24m 29.7235s, +16° 45′ 43.8103″
20h 24m 29.7235s, +16° 45′ 43.8103″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus
|
| Right ascension | 20h 24m 29.7235s[1] |
| Declination | +16° 45′ 43.812″[1] |
| Apparent magnitude (V) | 11.94[2] |
| Characteristics | |
| Spectral type | G0V |
| Apparent magnitude (J) | 11.103±0.022[3] |
| Apparent magnitude (H) | 10.846±0.022[3] |
| Apparent magnitude (K) | 10.791±0.020[3] |
| Variable type | Planetary transit[4] |
| Details Gyr | |
| Database references | |
| SIMBAD | data |
HAT-P-23 is a G-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 to solar abundance.
Naming
In 2019, the HAT-P-23 star has received a proper name Moriah and planet
HAT-P-23b - Jebus at an international NameExoWorlds 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.
Planetary system
In 2010 a
transiting hot Jupiter like planet was detected.[4] It has a measured dayside temperature of 2154±90 K.[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 of Titanium(II) oxide.[13]
−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 of Titanium(II) oxide.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
b (Jebus)
|
2.09±0.111 MJ | 0.0232±0.0002 | 1.2128868±0.0000004 | 0.096 | 85.1±1.5° | 1.224±0.037 RJ |
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b HAT-P-23 -- Star
- ^ S2CID 18913331. Vizier catalog entry
- ^ S2CID 119182075
- ^ .
- S2CID 209862471
- S2CID 118895482
- ^ IAU 100 NameExoWorlds Approved Names
- ^ S2CID 13149979.
- S2CID 211066260
- S2CID 55894097
- ^ S2CID 53607610
- S2CID 233204299
- Bibcode:2013RMxAA..49...71R
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