Confirmed exoplanet · Database record + computed analysis
HIP 65 A b
A confirmed world orbiting HIP 65 A, 201.5 light-years away.
A gas giant
22.75 Earth radii, Jupiter-class (Jupiter is 11.2). At only 1021.2 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky. Orbiting this close, it is a classic 'hot Jupiter', a giant that migrated inward from where it formed.
The orbit
Its year lasts about 23.5 hours, making it an ultra-short-period planet skimming its star. Orbiting this tightly around a cool star, it is very likely tidally locked: one hemisphere in permanent day, the other in permanent night.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 1,138 °C. Hot enough to melt copper; any surface would glow. It receives 661.0 times the starlight Earth gets.
Its sun
Its star is an orange K-type (4,590 K), K4 V: cooler and longer-lived than the Sun, a class some astronomers consider ideal for habitability. The system holds 2 stars, so its skies have more than one sun.
How far is that, really?
At 202 light-years, tonight's light from this system left it around the year 1824. A Voyager-speed probe would need roughly 3,565,370 years to get there.
How we found it
It was found by the transit method: the planet crosses its star's face on schedule, dimming it by a tiny, repeating fraction. The dip's depth gives the planet's size. The discovery was announced in 2020 from Transiting Exoplanet Survey Satellite (TESS).
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.