Confirmed exoplanet · Database record + computed analysis
HIP 77900 b
A confirmed world orbiting HIP 77900, 492.0 light-years away.
A gas giant
12.10 Earth radii, Jupiter-class (Jupiter is 11.2). With 6674.4 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 2,234 °C. Hot enough to melt copper; any surface would glow.
Its sun
Its star is hotter than the Sun (13,646 K), burning brighter and faster.
How far is that, really?
At 492 light-years, tonight's light from this system left it around the year 1533. A Voyager-speed probe would need roughly 8,705,570 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 2024 from European Space Agency (ESA) Gaia Satellite.
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.