2MASS J12073346-3932539 b
2MASS J12073346-3932539 b is a hot Jupiter orbiting the M8 star 2MASS J12073346-3932539 in the constellation Centaurus. It lies about 210 light-years from Earth and was discovered in 2004 using the imaging method.
How Big Is 2MASS J12073346-3932539 b?
2MASS J12073346-3932539 b has a radius of 15.69 times that of Earth, or 1.40 times the radius of Jupiter. Its mass is 1,653 times that of Earth.
Is 2MASS J12073346-3932539 b in the Habitable Zone?
The position of 2MASS J12073346-3932539 b relative to the habitable zone of 2MASS J12073346-3932539 cannot be precisely determined from the available orbital data.
Temperature on 2MASS J12073346-3932539 b
The equilibrium temperature of 2MASS J12073346-3932539 b is about 1,163 K (890 °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.
How Was 2MASS J12073346-3932539 b Discovered?
2MASS J12073346-3932539 b was discovered in 2004 using the imaging method, with observations from Paranal Observatory.
Direct imaging captures actual pictures of a planet by blocking out the overwhelming glare of its host star. It works best for young, hot, massive planets on wide orbits.
How Far Away Is 2MASS J12073346-3932539 b?
2MASS J12073346-3932539 b is 209.7 light-years (64.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1817. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,690,720 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. 2MASS J12073346-3932539 b scores 0.07, ranking #4,961 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: 2MASS J12073346-3932539
2MASS J12073346-3932539
- Spectral type
- M8
- Age
- 0.0 billion years (Sun: 4.6)
Planetary System
2MASS J12073346-3932539 b is the only planet known to orbit 2MASS J12073346-3932539 so far.
2MASS J12073346-3932539 b — Complete Data
| Radius | 15.693 Earth radii (1.400 Jupiter radii) |
|---|---|
| Mass | 1,652.71 Earth masses (5.200 Jupiter masses) |
| Equilibrium temperature | 1,163 K (890 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 209.7 light-years (64.3 parsecs) |
| Constellation | Centaurus |
| Discovery method | Imaging |
| Discovery facility | Paranal Observatory |
| Discovery year | 2004 |
Data: NASA Exoplanet Archive, last updated 2026-03-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About 2MASS J12073346-3932539 b
Is 2MASS J12073346-3932539 b habitable?
2MASS J12073346-3932539 b is not known to orbit within the habitable zone of 2MASS J12073346-3932539, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is 2MASS J12073346-3932539 b?
2MASS J12073346-3932539 b is about 210 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,690,720 years to get there.
How big is 2MASS J12073346-3932539 b compared to Earth?
2MASS J12073346-3932539 b has 15.69 times the radius of Earth and about 1,653 times its mass.
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