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Epic exoplanet 67 EP

ZTF J1230-2655 b

RA 187.5689° · Dec -26.9310° · exoplanet

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Score breakdown

· 6 badges
67 pts · Epic
Epic 78 pts → Anomaly
  • Ultra-hot Jupiter +26
  • Ultra-short period +14
  • Orbits a hot blue-white star +14
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 67

11 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Ultra-hot Jupiter · +26
  • Ultra-short period · +14
  • Blasted by starlight · +4
  • Orbits a hot blue-white star · +14

Trivia

What makes it special

  • Ultra-hot Jupiter. So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

Hard to believe

  • A year in a day. Its entire year is over in 5.7 hours. Birthdays here would come round faster than meals.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 18.9 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around March — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

diameter km
175870.3195
discovery facility
Zwicky Transient Facility
discovery method
Transit
discovery year
2025
dist ly
608.9006
eq temp k
2949.65
host star teff
10000
inclination
86.7
insolation
17889.745
mag
18.9116
mass earth
7024.0078
name
ZTF J1230-2655 b
orbital period days
0.236
radius earth
13.787
sys num planets
1
sys num stars
1

About ZTF J1230-2655 b

ZTF J1230-2655 b is an epic exoplanet. It lies about 608.9 light-years from Earth, shines at apparent magnitude 18.91, has an equilibrium temperature near 2,950 K and spans roughly 13.79 Earth radii.

So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

How to see it

At apparent magnitude 18.91, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, ZTF J1230-2655 b is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why ZTF J1230-2655 b is an epic exoplanet

ZTF J1230-2655 b scores 67 points on Spacedle's rarity scale, which places it in the epic tier. Another 11 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Ultra-hot Jupiter, Ultra-short period, Blasted by starlight and Orbits a hot blue-white star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.