ZTF J1230-2655 b: A Year In 5.7 Hours
Gas giant around ZTF J1230-2655
It is 1.23 times Jupiter's radius, closest in size to Jupiter, and 7024.0 times Earth's mass. A year there lasts 5.7 hours. The host star ZTF J1230-2655 runs at 10000 K with 0.65 times the Sun's mass.
5.7hours: one full year, start to finish
Radius
13.79 Earth radii
Mass
7024.0 Earth masses
One year
5.7 hours
Host star
ZTF J1230-2655 at 10000 K
Distance
609 light-years
Starlight blocked
10536.672% at each transit
Known and unknown, as the archive has it
A size. Yes.
A measured mass. Yes.
A density, the one clue to composition. No.
How far out it orbits. No.
A measured temperature rather than a derived one. No.
An eccentricity, so we know if the orbit is a circle. No.
What a crossing measures
The depth of the dip is the ratio of the two discs, so the radius follows.
The size came from a crossing, the mass did not. That pairing is uncommon and it is what lets anyone say whether this is rock or gas.
Found by Zwicky Transient Facility in 2025.
