Lupus-TR-3 b
Lupus-TR-3 b is a hot Jupiter orbiting Lupus-TR-3 in the constellation Lupus. It lies about 2,523 light-years from Earth and was discovered in 2007 using the transit method.
How Big Is Lupus-TR-3 b?
Lupus-TR-3 b has a radius of 9.98 times that of Earth, or 0.89 times the radius of Jupiter. Its mass is 257 times that of Earth, giving it a density of 1.40 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is Lupus-TR-3 b in the Habitable Zone?
Lupus-TR-3 b orbits inside the inner edge of the habitable zone of Lupus-TR-3. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Lupus-TR-3: 0.481–1.163 AU (conservative: 0.609–1.102 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 Lupus-TR-3 b — one full orbit around Lupus-TR-3 — lasts 3.91 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.046 AU — closer to its star than Mercury is to the Sun.
How Was Lupus-TR-3 b Discovered?
Lupus-TR-3 b was discovered in 2007 using the transit method, with observations from Multiple Observatories.
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 Lupus-TR-3 b?
Lupus-TR-3 b is 2,522.5 light-years (773.4 parsecs) from Earth. Light arriving here tonight left the planet about 2,523 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 44,396,000 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. Lupus-TR-3 b scores 0.15, ranking #4,208 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Lupus-TR-3
Lupus-TR-3
- Surface temperature
- 5,000 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
- Radius
- 0.82 R☉
Planetary System
Lupus-TR-3 b is the only planet known to orbit Lupus-TR-3 so far.
Lupus-TR-3 b — Complete Data
| Radius | 9.976 Earth radii (0.890 Jupiter radii) |
|---|---|
| Mass | 257.43 Earth masses (0.810 Jupiter masses) |
| Density | 1.40 g/cm³ (Earth: 5.51) |
| Orbital period | 3.91 days |
| Orbital distance | 0.046 AU |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 2,522.5 light-years (773.4 parsecs) |
| Constellation | Lupus |
| Discovery method | Transit |
| Discovery facility | Multiple Observatories |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Lupus-TR-3 b
Is Lupus-TR-3 b habitable?
No — Lupus-TR-3 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Lupus-TR-3 b?
Lupus-TR-3 b is about 2,523 light-years from Earth in the constellation Lupus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 44,396,000 years to get there.
How big is Lupus-TR-3 b compared to Earth?
Lupus-TR-3 b has 9.98 times the radius of Earth and about 257 times its mass.
How long is a year on Lupus-TR-3 b?
One orbit around Lupus-TR-3 takes 3.9 Earth days — short enough that 93 of its years would fit into one Earth year.
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