artist rendition
Artist's concept

PSR B1257+12 d is a Neptune-like exoplanet that orbits an unknown-type star. Its mass is 3.9 Earth, it takes 98.2 days to complete one orbit of its star, and is 0.46 AU from its star. Its discovery was announced in 1992.

PLANET TYPE
Neptune-like
DISCOVERY DATE
1992
MASS
3.9 Earth
PLANET RADIUS
Unknown
ORBITAL RADIUS
0.46 AU
ORBITAL PERIOD
98.2 days
ECCENTRICITY
Unknown
DETECTION METHOD
Pulsar Timing