Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus |
Right ascension | 21h 14m 56.85987s [1] |
Declination | −55° 52′ 18.4581″ [1] |
Apparent magnitude (V) | 12.9 [2] |
Characteristics | |
Spectral type | G6V [2] |
Astrometry | |
Radial velocity (Rv) | −3.28±1.62 [1] km/s |
Proper motion (μ) |
RA: 12.521
mas/
yr
[1] Dec.: -16.150 mas/ yr [1] |
Parallax (π) | 2.6878 ± 0.0131 mas [1] |
Distance | 1,213 ± 6
ly (372 ± 2 pc) |
Details [3] | |
Mass | 0.828±0.067 M☉ |
Radius | 0.858±0.024 R☉ |
Surface gravity (log g) | 4.489±0.013 [4] cgs |
Temperature | 5600±150 K |
Metallicity [Fe/H] | −0.37±0.13 dex |
Rotation | 16.0±1.0 d |
Rotational velocity (v sin i) | 1.9±1.2 km/s |
Age | 9.6+3.4 −4.2 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
WASP-46 is a G-type main-sequence star about 1,210 light-years (370 parsecs) away. The star is older than the Sun and is strongly depleted in heavy elements compared to the Sun, having just 45% of the solar abundance. [2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit. [6]
The star displays an excess ultraviolet emission associated with starspot activity, [7] and is suspected to be surrounded by a dust and debris disk. [8]
In 2011 a
transiting hot
superjovian planet, WASP-46b, was detected.
[2] The planet's equilibrium temperature is 1636±44
K.
[4] The dayside temperature measured in 2014 is much higher at 2386 K, indicating a very poor heat redistribution across the planet.
[9] A re-measurement of the dayside planetary temperature in 2020 resulted in a lower value of 1870+130
−120
K.
[10]
In 2017, a search for transit-timing variations of WASP-46b yielded zero results, thus ruling out existence of additional gas giants in the system. The orbital decay of WASP-46b was also not detected. [11]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 1.91±0.11 MJ | 0.02335±0.00063 | 1.43036763(93) | <0.022 [3] | 82.80±0.17 ° | 1.174±0.033 RJ |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus |
Right ascension | 21h 14m 56.85987s [1] |
Declination | −55° 52′ 18.4581″ [1] |
Apparent magnitude (V) | 12.9 [2] |
Characteristics | |
Spectral type | G6V [2] |
Astrometry | |
Radial velocity (Rv) | −3.28±1.62 [1] km/s |
Proper motion (μ) |
RA: 12.521
mas/
yr
[1] Dec.: -16.150 mas/ yr [1] |
Parallax (π) | 2.6878 ± 0.0131 mas [1] |
Distance | 1,213 ± 6
ly (372 ± 2 pc) |
Details [3] | |
Mass | 0.828±0.067 M☉ |
Radius | 0.858±0.024 R☉ |
Surface gravity (log g) | 4.489±0.013 [4] cgs |
Temperature | 5600±150 K |
Metallicity [Fe/H] | −0.37±0.13 dex |
Rotation | 16.0±1.0 d |
Rotational velocity (v sin i) | 1.9±1.2 km/s |
Age | 9.6+3.4 −4.2 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
WASP-46 is a G-type main-sequence star about 1,210 light-years (370 parsecs) away. The star is older than the Sun and is strongly depleted in heavy elements compared to the Sun, having just 45% of the solar abundance. [2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit. [6]
The star displays an excess ultraviolet emission associated with starspot activity, [7] and is suspected to be surrounded by a dust and debris disk. [8]
In 2011 a
transiting hot
superjovian planet, WASP-46b, was detected.
[2] The planet's equilibrium temperature is 1636±44
K.
[4] The dayside temperature measured in 2014 is much higher at 2386 K, indicating a very poor heat redistribution across the planet.
[9] A re-measurement of the dayside planetary temperature in 2020 resulted in a lower value of 1870+130
−120
K.
[10]
In 2017, a search for transit-timing variations of WASP-46b yielded zero results, thus ruling out existence of additional gas giants in the system. The orbital decay of WASP-46b was also not detected. [11]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 1.91±0.11 MJ | 0.02335±0.00063 | 1.43036763(93) | <0.022 [3] | 82.80±0.17 ° | 1.174±0.033 RJ |