Confirmed exoplanet · Database record + computed analysis
ROXs 12 b
A confirmed world orbiting ROXs 12, 445.7 light-years away.
A gas giant
12.20 Earth radii, Jupiter-class (Jupiter is 11.2). With 5085.0 Earth masses packed into that size, its density points to rock and iron rather than gas.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about -260 °C. Deep-freeze territory, colder than Antarctica's worst.
Its sun
Its star is a red dwarf (3,850 K surface), type M0: small, dim, flare-prone, and destined to outlive the Sun many times over. The system holds 2 stars, so its skies have more than one sun.
How far is that, really?
At 446 light-years, tonight's light from this system left it around the year 1580. A Voyager-speed probe would need roughly 7,885,459 years to get there.
How we found it
It was directly imaged, one of the rare planets actually photographed as its own point of light, possible only for young, hot, wide-orbiting giants. The discovery was announced in 2013 from W. M. Keck Observatory.
Everything above is computed from the archive’s measured values for this planet. Where a quantity is missing, the statement is omitted rather than guessed.
About this record
The measured values come from the NASA Exoplanet Archive, and any missing value has not been determined yet; the Atlas never fills gaps with guesses. More standout worlds: Proxima b, TRAPPIST-1e, K2-18 b, 55 Cancri e, and the detection methods that found them all.