Confirmed exoplanet · Database record + computed analysis
HD 144899 b
A confirmed world orbiting HD 144899, 377.2 light-years away.
A Neptune-class world
4.77 Earth radii, in the ice-giant size range. At only 20.3 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year, one full orbit, takes just 40.4 Earth days. The orbit is strongly stretched (eccentricity 0.82), so its distance from the star, and with it the climate, swings dramatically.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 498 °C. Hotter than Venus's surface. It receives 58.8 times the starlight Earth gets.
Its sun
Its star is hotter than the Sun (6,126 K), burning brighter and faster.
How far is that, really?
At 377 light-years, tonight's light from this system left it around the year 1648. A Voyager-speed probe would need roughly 6,674,509 years to get there.
How we found it
It was found by the radial-velocity method: the planet's gravity swings its star in a small circle, and that wobble shows up as a rhythmic Doppler shift in the starlight. The wobble's size gives the planet's minimum mass. The discovery was announced in 2022 from Multiple Observatories.
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.