ROXs 42 B b
ROXs 42 B b is a hot Jupiter orbiting the M0 star ROXs 42 B in the constellation Ophiuchus. It lies about 468 light-years from Earth and was discovered in 2013 using the imaging method.
Is ROXs 42 B b in the Habitable Zone?
The position of ROXs 42 B b relative to the habitable zone of ROXs 42 B cannot be precisely determined from the available orbital data.
Temperature on ROXs 42 B b
The equilibrium temperature of ROXs 42 B b is about 1,975 K (1,702 °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
ROXs 42 B b orbits at an average distance of 157.000 AU.
How Was ROXs 42 B b Discovered?
ROXs 42 B b was discovered in 2013 using the imaging method, with observations from Multiple Observatories.
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 ROXs 42 B b?
ROXs 42 B b is 468.3 light-years (143.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1558. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,242,080 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. ROXs 42 B b scores 0.07, ranking #4,916 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: ROXs 42 B
ROXs 42 B b is a circumbinary planet — it orbits around two stars at once, like Tatooine in Star Wars.
ROXs 42 B
- Spectral type
- M0
- Mass
- 1.00 M☉
- Age
- 0.0 billion years (Sun: 4.6)
Planetary System
ROXs 42 B b is the only planet known to orbit ROXs 42 B so far.
ROXs 42 B b — Complete Data
| Mass | 2,860.00 Earth masses (9.000 Jupiter masses) |
|---|---|
| Orbital distance | 157.000 AU |
| Equilibrium temperature | 1,975 K (1,702 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 468.3 light-years (143.6 parsecs) |
| Constellation | Ophiuchus |
| Discovery method | Imaging |
| Discovery facility | Multiple Observatories |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About ROXs 42 B b
Is ROXs 42 B b habitable?
ROXs 42 B b is not known to orbit within the habitable zone of ROXs 42 B, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is ROXs 42 B b?
ROXs 42 B b is about 468 light-years from Earth in the constellation Ophiuchus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,242,080 years to get there.
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