:INFO
Gas giant around ZTF J1828+2308
It is 0.99 times Jupiter's radius, closest in size to Jupiter, and 6356.6 times Earth's mass. A year there lasts 2.7 hours. The host star ZTF J1828+2308 runs at 15900 K with 0.61 times the Sun's mass.

:COUNTER
2.7 hours: one full year, start to finish

:STATS
[icon:TARGET] Radius | 11.13 Earth radii
[icon:CHART] Mass | 6356.6 Earth masses
[icon:CLOCK] One year | 2.7 hours
[icon:STAR] Host star | ZTF J1828+2308 at 15900 K
[icon:USERS] Distance | 658 light-years
[icon:TRENDING_DOWN] Starlight blocked | 6054.236% at each transit

:CHECKLIST
What has been measured here and what has not
[ ] A size. Yes.
[ ] A mass. Yes.
[ ] A density, which decides rock or gas. No.
[ ] How far out it orbits. No.
[ ] A measured temperature rather than a derived one. No.
[ ] The shape of the orbit. No.

:PATH
What the transit gives
Block a known fraction of a known star and you have measured a width.

:NOTE
Found by Zwicky Transient Facility in 2025.

:NOTE
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.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/ZTF%20J1828+2308%20b
NASA Exoplanet Archive: the full record for ZTF J1828+2308 b