Epic exoplanet 51 EP

HR 8799 e

RA 346.8701° · Dec 21.1340° · exoplanet

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Score breakdown

· 6 badges

51 pts · Epic

Epic 68 pts → Anomaly

Directly imaged +16
Hot Jupiter +10
Long-period world +10
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 51

17 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Long-period world · +10
Multi-planet system · +6
Directly imaged · +16

Trivia

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 2.4 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 210 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1345 years in a starship at a tenth of light speed.
Distance. 135 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1891.

Saying hello

Say hello. A radio message and its reply would take 269 years round-trip.

Standing on it

A year here. A full year lasts about 57 Earth years.

By the numbers

Size. About 13.1× the width of Earth.
Volume. About 2256 Earths could fit inside it.
Mass. Roughly 3178× Earth's mass — about 10 Jupiters.
Your weight. You'd weigh about 18.5× your Earth weight standing here.
Temperature. Around 877°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by W. M. Keck Observatory using the imaging method.

Cosmic context

Crowded system. One of at least 4 planets orbiting its star.

Properties

density gcc: 7.74
discovery facility: W. M. Keck Observatory
discovery method: Imaging
dist ly: 134.5201
eccentricity: 0.15
eq temp k: 1150
insolation: 0.0201
mass earth: 3178.3
name: HR 8799 e
orbital period days: 20815.6
radius earth: 13.1145
sys num planets: 4

About HR 8799 e

HR 8799 e is an epic exoplanet. It lies about 134.5 light-years from Earth, has an equilibrium temperature near 1,150 K, spans roughly 13.11 Earth radii and weighs about 3,178.3 Earth masses.

One of at least 4 planets orbiting its star.

How to see it

Like any astronomical target, HR 8799 e 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 HR 8799 e is an epic exoplanet

HR 8799 e scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 17 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Long-period world, Multi-planet system and Directly imaged — 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.