Rare exoplanet 33 EP

HD 28471 b

RA 66.2875° · Dec -64.0787° · exoplanet

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Score breakdown

· 4 badges

33 pts · Rare

Rare 46 pts → Epic

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

Total score 33

13 more points to reach Epic.

Badges

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

Trivia

What makes it special

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

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 2.5 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 222.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1424 years in a starship at a tenth of light speed.
Distance. 142 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1884.

Saying hello

Say hello. A radio message and its reply would take 285 years round-trip.

Standing on it

A year here. A full year lasts just 3.2 Earth days.

By the numbers

Size. About 1.8× the width of Earth.
Volume. About 5.4 Earths could fit inside it.
Mass. About 3.7× the mass of Earth.
Your weight. You'd weigh about 1.2× your Earth weight standing here.
Temperature. Around 1104°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by La Silla Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 3 planets orbiting its star.

Properties

density gcc: 3.81
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 142.3524
eccentricity: 0.195
eq temp k: 1377
insolation: 653.3957
mass earth: 3.72
name: HD 28471 b
orbital period days: 3.1649
radius earth: 1.75
sys num planets: 3

About HD 28471 b

HD 28471 b is a rare exoplanet. It lies about 142.4 light-years from Earth, has an equilibrium temperature near 1,377 K, spans roughly 1.75 Earth radii and weighs about 3.72 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, HD 28471 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 28471 b is a rare exoplanet

HD 28471 b scores 33 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, Lava world and Multi-planet 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.