Epic exoplanet 47 EP

HD 158259 b

RA 261.3496° · Dec 52.7905° · exoplanet

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Score breakdown

· 5 badges

47 pts · Epic

Epic 68 pts → Anomaly

Lava world +14
Richly packed system +14
Super-Earth +8
Multi-planet system +6
Confirmed exoplanet +5

Total score 47

21 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
Super-Earth · +8
Lava world · +14
Multi-planet system · +6
Richly packed system · +14

Trivia

What makes it special

Lava world. Its surface is likely an ocean of molten rock.
Packed system. Crammed into a system of five or more planets.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 1.6 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 137.8 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 882 years in a starship at a tenth of light speed.
Distance. 88.2 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1938.

Saying hello

Say hello. A radio message and its reply would take 176 years round-trip.

Standing on it

A year here. A full year lasts just 2.2 Earth days.

By the numbers

Size. About 1.3× the width of Earth.
Mass. About 2.2× the mass of Earth.
Your weight. You'd weigh about 1.4× your Earth weight standing here.
Temperature. Around 1189°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by Haute-Provence Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 5 planets orbiting its star.

Properties

density gcc: 6.12
discovery facility: Haute-Provence Observatory
discovery method: Radial Velocity
dist ly: 88.2245
eq temp k: 1462
insolation: 759.183
mass earth: 2.22
name: HD 158259 b
orbital period days: 2.178
radius earth: 1.2823
sys num planets: 5

About HD 158259 b

HD 158259 b is an epic exoplanet. It lies about 88.2 light-years from Earth, has an equilibrium temperature near 1,462 K, spans roughly 1.28 Earth radii and weighs about 2.22 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, HD 158259 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 HD 158259 b is an epic exoplanet

HD 158259 b scores 47 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Super-Earth, Lava world, Multi-planet system and Richly packed system — 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.