TOI-1478 b
TOI-1478 b is a cold gas giant orbiting TOI-1478 in the constellation Puppis. It lies about 499 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-1478 b?
TOI-1478 b has a radius of 11.99 times that of Earth, or 1.07 times the radius of Jupiter. Its mass is 280 times that of Earth.
Is TOI-1478 b in the Habitable Zone?
The position of TOI-1478 b relative to the habitable zone of TOI-1478 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on TOI-1478 b — one full orbit around TOI-1478 — lasts 10.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.082 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-1478 b Discovered?
TOI-1478 b was discovered in 2021 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 TOI-1478 b?
TOI-1478 b is 498.7 light-years (152.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1528. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,777,120 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. TOI-1478 b scores 0.08, ranking #4,608 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1478
TOI-1478
Planetary System
TOI-1478 b is the only planet known to orbit TOI-1478 so far.
TOI-1478 b — Complete Data
| Radius | 11.994 Earth radii (1.070 Jupiter radii) |
|---|---|
| Mass | 279.69 Earth masses (0.880 Jupiter masses) |
| Orbital period | 10.18 days |
| Orbital distance | 0.082 AU |
| Eccentricity | 0.055 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 498.7 light-years (152.9 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2025-04-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1478 b
Is TOI-1478 b habitable?
TOI-1478 b is not known to orbit within the habitable zone of TOI-1478, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is TOI-1478 b?
TOI-1478 b is about 499 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,777,120 years to get there.
How big is TOI-1478 b compared to Earth?
TOI-1478 b has 11.99 times the radius of Earth and about 280 times its mass.
How long is a year on TOI-1478 b?
One orbit around TOI-1478 takes 10.2 Earth days — short enough that 36 of its years would fit into one Earth year.
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