Epic exoplanet 53 EP

KELT-9 b

RA 307.8599° · Dec 39.9389° · exoplanet

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Score breakdown

· 5 badges

53 pts · Epic

Epic 68 pts → Anomaly

Ultra-hot Jupiter +26
Hot Jupiter +10
Blasted by starlight +8
Confirmed exoplanet +5
Gas giant +4

Total score 53

15 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Ultra-hot Jupiter · +26
Blasted by starlight · +8

Trivia

What makes it special

Ultra-hot Jupiter. So hot that iron vaporises and rains back down as molten metal.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 11.7 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 1 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 6668 years in a starship at a tenth of light speed.
Distance. 667 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1359.

Saying hello

Say hello. A radio message and its reply would take 1334 years round-trip.

Standing on it

A year here. A full year lasts just 1.5 Earth days.

By the numbers

Size. About 21.2× the width of Earth.
Volume. About 9523 Earths could fit inside it.
Mass. Roughly 915× Earth's mass — about 2.9 Jupiters.
Your weight. You'd weigh about 2.0× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 4050 K — hot enough to vaporise iron.

How we found it

Discovery. Found by KELT-North using the transit method.

Properties

density gcc: 0.53
discovery facility: KELT-North
discovery method: Transit
dist ly: 666.8422
eccentricity: 0
eq temp k: 4050
insolation: 44900
mass earth: 915.3504
name: KELT-9 b
orbital period days: 1.4811
radius earth: 21.1962
sys num planets: 1

About KELT-9 b

KELT-9 b is an epic exoplanet. It lies about 666.8 light-years from Earth, has an equilibrium temperature near 4,050 K, spans roughly 21.2 Earth radii and weighs about 915.35 Earth masses.

So hot that iron vaporises and rains back down as molten metal.

How to see it

Like any astronomical target, KELT-9 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 KELT-9 b is an epic exoplanet

KELT-9 b scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 15 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Ultra-hot Jupiter and Blasted by starlight — 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.