Uncommon exoplanet 29 EP

HD 10180 h

RA 24.4731° · Dec -60.5115° · exoplanet

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Score breakdown

· 4 badges

29 pts · Uncommon

Uncommon 33 pts → Rare

Richly packed system +14
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 29

4 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Multi-planet system · +6
Richly packed system · +14

Trivia

What makes it special

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. ≈ 2.2 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 198.4 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1271 years in a starship at a tenth of light speed.
Distance. 127 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1899.

Saying hello

Say hello. A radio message and its reply would take 254 years round-trip.

Standing on it

A year here. A full year lasts about 6 Earth years.

By the numbers

Size. About 9.4× the width of Earth.
Volume. About 831 Earths could fit inside it.
Mass. Roughly 64.4× Earth's mass — about 0.2 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 -110°C — colder than dry ice.

How we found it

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

Cosmic context

Crowded system. One of at least 6 planets orbiting its star.

Properties

density gcc: 0.426
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 127.0727
eccentricity: 0.095
eq temp k: 163.24
insolation: 0.1303
mass earth: 64.4
name: HD 10180 h
orbital period days: 2205
radius earth: 9.4
sys num planets: 6

About HD 10180 h

HD 10180 h is an uncommon exoplanet. It lies about 127.1 light-years from Earth, has an equilibrium temperature near 163 K, spans roughly 9.4 Earth radii and weighs about 64.4 Earth masses.

Crammed into a system of five or more planets.

How to see it

Like any astronomical target, HD 10180 h 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 10180 h is an uncommon exoplanet

HD 10180 h scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, 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.