Epic exoplanet 54 EP

Kepler-91 b

RA 285.6729° · Dec 44.1168° · exoplanet

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Score breakdown

· 7 badges

54 pts · Epic

Epic 68 pts → Anomaly

Lava world +14
Hot Jupiter +10
Distant (>1000 ly) +10
Blasted by starlight +8
Confirmed exoplanet +5
Gas giant +4
Found by Kepler +3

Total score 54

14 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Lava world · +14
Blasted by starlight · +8
Found by Kepler · +3
Distant (>1000 ly) · +10

Trivia

What makes it special

Lava world. Its surface is likely an ocean of molten rock.

Could we get there?

Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

Aboard Voyager 1. ≈ 74.2 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 6.6 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 42.2 thousand years in a starship at a tenth of light speed.
Distance. 4223 light-years from Earth.

Look-back time

Look-back time. Its light left before the last ice age ended.

Saying hello

Say hello. A radio message and its reply would take 8445 years round-trip.

Standing on it

A year here. A full year lasts just 6.2 Earth days.

By the numbers

Size. About 15.3× the width of Earth.
Volume. About 3598 Earths could fit inside it.
Mass. Roughly 257× Earth's mass — about 0.8 Jupiters.
Your weight. You'd weigh about 1.1× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 2040 K — hot enough to vaporise iron.

How we found it

Discovery. Found by Kepler using the transit method.

Properties

density gcc: 0.4
discovery facility: Kepler
discovery method: Transit
dist ly: 4222.7091
eccentricity: 0.0519
eq temp k: 2040
insolation: 3273.324
mass earth: 257.4423
name: Kepler-91 b
orbital period days: 6.2466
radius earth: 15.3227
sys num planets: 1

About Kepler-91 b

Kepler-91 b is an epic exoplanet. It lies about 4,222.7 light-years from Earth, has an equilibrium temperature near 2,040 K, spans roughly 15.32 Earth radii and weighs about 257.44 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, Kepler-91 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 Kepler-91 b is an epic exoplanet

Kepler-91 b scores 54 points on Spacedle's rarity scale, which places it in the epic tier. Another 14 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Lava world, Blasted by starlight, Found by Kepler and Distant (>1000 ly) — 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.