Confirmed exoplanet · Database record + computed analysis
psi1 Dra B b
A confirmed world orbiting psi1 Dra B, 74.1 light-years away.
A gas giant
13.50 Earth radii, Jupiter-class (Jupiter is 11.2). At only 486.3 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year takes 3,117 Earth days (8.5 Earth years). The orbit is strongly stretched (eccentricity 0.40), 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 -114 °C. It receives only 0.11 times Earth's starlight.
Its sun
Its star is hotter than the Sun (6,212 K, G0 V), burning brighter and faster. The system holds 3 stars, so its skies have more than one sun.
How far is that, really?
At 74 light-years, tonight's light from this system left it around the year 1951. A Voyager-speed probe would need roughly 1,311,000 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 2015 from McDonald 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.