TOI-1694 b
TOI-1694 b is a Neptune-like planet orbiting TOI-1694 in the constellation Camelopardalis. It lies about 407 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-1694 b?
TOI-1694 b has a radius of 5.34 times that of Earth. Its mass is 31.3 times that of Earth, giving it a density of 1.13 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1694 b in the Habitable Zone?
TOI-1694 b orbits inside the inner edge of the habitable zone of TOI-1694. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1694: 0.483–1.165 AU (conservative: 0.611–1.104 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1694 b
The equilibrium temperature of TOI-1694 b is about 943 K (670 °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 TOI-1694 b — one full orbit around TOI-1694 — lasts 3.77 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.045 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1694 b Discovered?
TOI-1694 b 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 TOI-1694 b?
TOI-1694 b is 406.7 light-years (124.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1620. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,157,920 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-1694 b scores 0.15, ranking #4,224 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1694
TOI-1694
- Surface temperature
- 5,058 K (Sun: 5,772 K)
- Mass
- 0.85 M☉
- Radius
- 0.80 R☉
- Luminosity
- 0.3820 L☉
- Age
- 4.3 billion years (Sun: 4.6)
The TOI-1694 Planetary System
TOI-1694 b is one of 2 known planets in the TOI-1694 system. Its siblings:
- TOI-1694 c (Cold Gas Giant)
TOI-1694 b — Complete Data
| Radius | 5.342 Earth radii (0.477 Jupiter radii) |
|---|---|
| Mass | 31.30 Earth masses (0.098 Jupiter masses) |
| Density | 1.13 g/cm³ (Earth: 5.51) |
| Orbital period | 3.77 days |
| Orbital distance | 0.045 AU |
| Equilibrium temperature | 943 K (670 °C) |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 406.7 light-years (124.7 parsecs) |
| Constellation | Camelopardalis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-07-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1694 b
Is TOI-1694 b habitable?
No — TOI-1694 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1694 b?
TOI-1694 b is about 407 light-years from Earth in the constellation Camelopardalis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,157,920 years to get there.
How big is TOI-1694 b compared to Earth?
TOI-1694 b has 5.34 times the radius of Earth and about 31.3 times its mass.
How long is a year on TOI-1694 b?
One orbit around TOI-1694 takes 3.8 Earth days — short enough that 97 of its years would fit into one Earth year.
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