ZTF J1230-2655 b
ZTF J1230-2655 b is a hot Jupiter orbiting ZTF J1230-2655 in the constellation Hydra. It lies about 609 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is ZTF J1230-2655 b?
ZTF J1230-2655 b has a radius of 13.79 times that of Earth, or 1.23 times the radius of Jupiter. Its mass is 7,024 times that of Earth.
Is ZTF J1230-2655 b in the Habitable Zone?
The position of ZTF J1230-2655 b relative to the habitable zone of ZTF J1230-2655 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on ZTF J1230-2655 b — one full orbit around ZTF J1230-2655 — lasts just 5.7 hours, shorter than Mercury's 88-day year.
How Was ZTF J1230-2655 b Discovered?
ZTF J1230-2655 b was discovered in 2025 using the transit method, with observations from Zwicky Transient Facility.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is ZTF J1230-2655 b?
ZTF J1230-2655 b is 608.9 light-years (186.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1418. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,716,640 years to make the journey.
The Host Star: ZTF J1230-2655
ZTF J1230-2655
- Surface temperature
- 10,000 K (Sun: 5,772 K)
- Mass
- 0.65 M☉
- Radius
- 0.01 R☉
Planetary System
ZTF J1230-2655 b is the only planet known to orbit ZTF J1230-2655 so far.
ZTF J1230-2655 b — Complete Data
| Radius | 13.787 Earth radii (1.230 Jupiter radii) |
|---|---|
| Mass | 7,024.01 Earth masses (22.100 Jupiter masses) |
| Orbital period | 0.24 days |
| Distance from Earth | 608.9 light-years (186.7 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | Zwicky Transient Facility |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-03-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About ZTF J1230-2655 b
Is ZTF J1230-2655 b habitable?
ZTF J1230-2655 b is not known to orbit within the habitable zone of ZTF J1230-2655, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is ZTF J1230-2655 b?
ZTF J1230-2655 b is about 609 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,716,640 years to get there.
How big is ZTF J1230-2655 b compared to Earth?
ZTF J1230-2655 b has 13.79 times the radius of Earth and about 7,024 times its mass.
How long is a year on ZTF J1230-2655 b?
One orbit around ZTF J1230-2655 takes 0.2 Earth days — short enough that 1,548 of its years would fit into one Earth year.
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