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] |
Astrometry | |
Radial velocity (Rv) | -14.324 km/s |
Proper motion (μ) |
RA: 13.325(11)
mas/
yr
[1] Dec.: −5.505(11) mas/ yr [1] |
Parallax (π) | 2.7358 ± 0.0108 mas [1] |
Distance | 1,192 ± 5
ly (366 ± 1 pc) |
Details [4] | |
Mass | 1.13±0.035 M☉ |
Radius | 1.203±0.074 R☉ |
Luminosity | 1.58±0.23 L☉ |
Surface gravity (log g) | 4.33±0.05 cgs |
Temperature | 5905±80 K |
Metallicity | 0.15±0.04 |
Rotation | 7.015 d [5] |
Rotational velocity (v sin i) | 8.1±0.5 km/s |
Age | 4.0±1.0 Gyr |
Other designations | |
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.
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.
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]
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 |
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] |
Astrometry | |
Radial velocity (Rv) | -14.324 km/s |
Proper motion (μ) |
RA: 13.325(11)
mas/
yr
[1] Dec.: −5.505(11) mas/ yr [1] |
Parallax (π) | 2.7358 ± 0.0108 mas [1] |
Distance | 1,192 ± 5
ly (366 ± 1 pc) |
Details [4] | |
Mass | 1.13±0.035 M☉ |
Radius | 1.203±0.074 R☉ |
Luminosity | 1.58±0.23 L☉ |
Surface gravity (log g) | 4.33±0.05 cgs |
Temperature | 5905±80 K |
Metallicity | 0.15±0.04 |
Rotation | 7.015 d [5] |
Rotational velocity (v sin i) | 8.1±0.5 km/s |
Age | 4.0±1.0 Gyr |
Other designations | |
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.
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.
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]
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 |