TOI-2076 d
TOI-2076 d is a puffy low-density planet orbiting the K V star TOI-2076 in the constellation Boötes. It lies about 137 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-2076 d?
TOI-2076 d has a radius of 3.27 times that of Earth. Its mass is 7.3 times that of Earth, giving it a density of 1.12 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2076 d in the Habitable Zone?
The position of TOI-2076 d relative to the habitable zone of TOI-2076 cannot be precisely determined from the available orbital data.
Temperature on TOI-2076 d
The equilibrium temperature of TOI-2076 d is about 490 K (217 °C) — hotter than anywhere on Earth. 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-2076 d — one full orbit around TOI-2076 — lasts 35.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.198 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.027).
How Was TOI-2076 d Discovered?
TOI-2076 d 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-2076 d?
TOI-2076 d is 136.7 light-years (41.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1890. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,405,920 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-2076 d scores 0.27, ranking #2,482 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2076
TOI-2076
- Spectral type
- K V
- Mass
- 0.85 M☉
- Radius
- 0.76 R☉
- Age
- 0.2 billion years (Sun: 4.6)
The TOI-2076 Planetary System
TOI-2076 d is one of 4 known planets in the TOI-2076 system. Its siblings:
- TOI-2076 b (Mini Neptune)
- TOI-2076 c (Puffy Planet)
- TOI-2076 e (Super Earth)
TOI-2076 d — Complete Data
| Radius | 3.270 Earth radii (0.292 Jupiter radii) |
|---|---|
| Mass | 7.30 Earth masses (0.023 Jupiter masses) |
| Density | 1.12 g/cm³ (Earth: 5.51) |
| Orbital period | 35.13 days |
| Orbital distance | 0.198 AU |
| Eccentricity | 0.027 |
| Equilibrium temperature | 490 K (217 °C) |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 136.7 light-years (41.9 parsecs) |
| Constellation | Boötes |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2026-04-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2076 d
Is TOI-2076 d habitable?
TOI-2076 d is not known to orbit within the habitable zone of TOI-2076, and as a puffy low-density planet it is an unlikely candidate for life as we know it.
How far away is TOI-2076 d?
TOI-2076 d is about 137 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,405,920 years to get there.
How big is TOI-2076 d compared to Earth?
TOI-2076 d has 3.27 times the radius of Earth and about 7.3 times its mass.
How long is a year on TOI-2076 d?
One orbit around TOI-2076 takes 35.1 Earth days — short enough that 10 of its years would fit into one Earth year.
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