WASP-148 c
WASP-148 c is a cold gas giant orbiting WASP-148 in the constellation Hercules. It lies about 804 light-years from Earth and was discovered in 2020 using the radial velocity method.
Is WASP-148 c in the Habitable Zone?
WASP-148 c orbits inside the inner edge of the habitable zone of WASP-148. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of WASP-148: 0.648–1.536 AU (conservative: 0.821–1.456 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on WASP-148 c — one full orbit around WASP-148 — lasts 34.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.204 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.18).
How Was WASP-148 c Discovered?
WASP-148 c was discovered in 2020 using the radial velocity method, with observations from Haute-Provence Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is WASP-148 c?
WASP-148 c is 803.5 light-years (246.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1223. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,141,600 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-148 c scores 0.12, ranking #4,328 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: WASP-148
WASP-148
- Surface temperature
- 5,555 K (Sun: 5,772 K)
- Mass
- 0.95 M☉
- Radius
- 0.91 R☉
- Luminosity
- 0.7260 L☉
- Age
- 3.6 billion years (Sun: 4.6)
The WASP-148 Planetary System
WASP-148 c is one of 2 known planets in the WASP-148 system. Its siblings:
- WASP-148 b (Hot Jupiter)
WASP-148 c — Complete Data
| Mass | 124.59 Earth masses (0.392 Jupiter masses) |
|---|---|
| Orbital period | 34.52 days |
| Orbital distance | 0.204 AU |
| Eccentricity | 0.181 |
| Earth Similarity Index | 0.12 |
| Distance from Earth | 803.5 light-years (246.4 parsecs) |
| Constellation | Hercules |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2022-10-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About WASP-148 c
Is WASP-148 c habitable?
No — WASP-148 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is WASP-148 c?
WASP-148 c is about 804 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,141,600 years to get there.
How long is a year on WASP-148 c?
One orbit around WASP-148 takes 34.5 Earth days — short enough that 11 of its years would fit into one Earth year.
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