TOI-674 b
TOI-674 b is a Neptune-like planet orbiting the M2 V star TOI-674 in the constellation Antlia. It lies about 150 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-674 b?
TOI-674 b has a radius of 5.25 times that of Earth. Its mass is 23.6 times that of Earth, giving it a density of 0.91 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-674 b in the Habitable Zone?
TOI-674 b orbits inside the inner edge of the habitable zone of TOI-674. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-674: 0.127–0.331 AU (conservative: 0.161–0.313 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-674 b
The equilibrium temperature of TOI-674 b is about 635 K (362 °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. It receives 38.40 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-674 b — one full orbit around TOI-674 — lasts just 47.5 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.025 AU — closer to its star than Mercury is to the Sun.
How Was TOI-674 b Discovered?
TOI-674 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-674 b?
TOI-674 b is 150.3 light-years (46.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1876. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,645,280 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-674 b scores 0.17, ranking #4,072 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-674
TOI-674
- Spectral type
- M2 V
- Surface temperature
- 3,514 K (Sun: 5,772 K)
- Mass
- 0.42 M☉
- Radius
- 0.42 R☉
- Luminosity
- 0.0243 L☉
Planetary System
TOI-674 b is the only planet known to orbit TOI-674 so far.
TOI-674 b — Complete Data
| Radius | 5.250 Earth radii (0.468 Jupiter radii) |
|---|---|
| Mass | 23.60 Earth masses (0.074 Jupiter masses) |
| Density | 0.91 g/cm³ (Earth: 5.51) |
| Orbital period | 1.98 days |
| Orbital distance | 0.025 AU |
| Equilibrium temperature | 635 K (362 °C) |
| Stellar irradiation | 38.40× Earth |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 150.3 light-years (46.1 parsecs) |
| Constellation | Antlia |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-674 b
Is TOI-674 b habitable?
No — TOI-674 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-674 b?
TOI-674 b is about 150 light-years from Earth in the constellation Antlia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,645,280 years to get there.
How big is TOI-674 b compared to Earth?
TOI-674 b has 5.25 times the radius of Earth and about 23.6 times its mass.
How long is a year on TOI-674 b?
One orbit around TOI-674 takes 2.0 Earth days — short enough that 185 of its years would fit into one Earth year.
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