Rare exoplanet 35 EP

HD 133131 A c

RA 225.8985° · Dec -27.8431° · exoplanet

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Score breakdown

· 5 badges

35 pts · Rare

Rare 46 pts → Epic

Puffy low-density world +12
Frozen world +8
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 35

11 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Frozen world · +8
Puffy low-density world · +12
Multi-planet system · +6

Trivia

What makes it special

Frozen world. A deep-frozen world far from its star's warmth.
Cotton-candy planet. So low-density it would float on water.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 3 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 262.1 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1679 years in a starship at a tenth of light speed.
Distance. 168 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1858.

Saying hello

Say hello. A radio message and its reply would take 336 years round-trip.

Standing on it

A year here. A full year lasts about 9.8 Earth years.

By the numbers

Size. About 14.3× the width of Earth.
Volume. About 2924 Earths could fit inside it.
Mass. Roughly 133× Earth's mass — about 0.4 Jupiters.
Your weight. You'd weigh about 0.7× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. A frigid -144°C — colder than dry ice.

How we found it

Discovery. Found by Las Campanas Observatory using the radial velocity method.

Cosmic context

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

Properties

density gcc: 0.251
discovery facility: Las Campanas Observatory
discovery method: Radial Velocity
dist ly: 167.8842
eccentricity: 0.49
eq temp k: 128.96
insolation: 0.0477
mass earth: 133.4886
name: HD 133131 A c
orbital period days: 3568
radius earth: 14.3
sys num planets: 3

About HD 133131 A c

HD 133131 A c is a rare exoplanet. It lies about 167.9 light-years from Earth, has an equilibrium temperature near 129 K, spans roughly 14.3 Earth radii and weighs about 133.49 Earth masses.

A deep-frozen world far from its star's warmth.

How to see it

Like any astronomical target, HD 133131 A c 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 133131 A c is a rare exoplanet

HD 133131 A c scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Puffy low-density 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.