WASP-78
Coordinates: 
04h 15m 01.5044s, −22° 06′ 59.1039″
04h 15m 01.5044s, −22° 06′ 59.1039″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 15m 01.5044s[1] |
| Declination | −22° 06′ 59.1039″[1] |
| Apparent magnitude (V) | 12.0[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star[citation needed ]
|
| Spectral type | F8[2] |
| Details | |
Gyr | |
| Database references | |
| SIMBAD | data |
WASP-78, is a single F-type main-sequence star about 2500 light-years away. It is likely to be younger than the Sun at 3.4+1.5
−0.8 billion years.[4] WASP-78 is depleted in heavy elements, having a 45% concentration of iron compared to the Sun.
Planetary system
In 2012 a
b was detected on a circular orbit. The planetary equilibrium temperature is 2350±80 K,[2] while the nightside temperature measured in 2019 is 2200±41 K.[5] The dayside planetary temperature measured in 2020 is 2560±130 K.[6]
A survey in 2016 measured a
Rossiter-McLaughlin effect and found the planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to −6.4±5.9°[4] The planet cannot have formed in its current orbit and has likely undergone in the past a migration from the initial highly eccentric orbit.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
b
|
0.89±0.08 MJ | 0.0362±0.0008 | 2.17517632±0.0000047 | 0 | 83.2+2.3 −1.6° |
1.70±0.11 RJ |
References
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