WASP-84 c
WASP-84 c is a super-Earth orbiting the K0 star WASP-84 in the constellation Hydra. It lies about 328 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is WASP-84 c?
WASP-84 c has a radius of 1.95 times that of Earth. Its mass is 15.2 times that of Earth, giving it a density of 11.20 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is WASP-84 c in the Habitable Zone?
The position of WASP-84 c relative to the habitable zone of WASP-84 cannot be precisely determined from the available orbital data.
Temperature on WASP-84 c
The equilibrium temperature of WASP-84 c is about 1,329 K (1,056 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on WASP-84 c — one full orbit around WASP-84 — lasts just 34.7 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.024 AU — closer to its star than Mercury is to the Sun.
How Was WASP-84 c Discovered?
WASP-84 c was discovered in 2023 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is WASP-84 c?
WASP-84 c is 328.1 light-years (100.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1698. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,774,560 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. WASP-84 c scores 0.26, ranking #2,897 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-84
WASP-84
- Spectral type
- K0
- Mass
- 0.85 M☉
- Radius
- 0.77 R☉
The WASP-84 Planetary System
WASP-84 c is one of 2 known planets in the WASP-84 system. Its siblings:
- WASP-84 b (Hot Jupiter)
WASP-84 c — Complete Data
| Radius | 1.950 Earth radii (0.174 Jupiter radii) |
|---|---|
| Mass | 15.20 Earth masses (0.048 Jupiter masses) |
| Density | 11.20 g/cm³ (Earth: 5.51) |
| Orbital period | 1.45 days |
| Orbital distance | 0.024 AU |
| Equilibrium temperature | 1,329 K (1,056 °C) |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 328.1 light-years (100.6 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-07-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-84 c
Is WASP-84 c habitable?
WASP-84 c is not known to orbit within the habitable zone of WASP-84, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is WASP-84 c?
WASP-84 c is about 328 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,774,560 years to get there.
How big is WASP-84 c compared to Earth?
WASP-84 c has 1.95 times the radius of Earth and about 15.2 times its mass.
How long is a year on WASP-84 c?
One orbit around WASP-84 takes 1.4 Earth days — short enough that 252 of its years would fit into one Earth year.
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