Uncommon exoplanet 29 EP

HD 102843 b

RA 177.5855° · Dec -1.2523° · exoplanet

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Score breakdown

· 4 badges

29 pts · Uncommon

Uncommon 33 pts → Rare

Puffy low-density world +12
Frozen world +8
Confirmed exoplanet +5
Gas giant +4

Total score 29

4 more points to reach Rare.

Badges

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

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. ≈ 3.6 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 319.6 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 2047 years in a starship at a tenth of light speed.
Distance. 205 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1821.

Saying hello

Say hello. A radio message and its reply would take 409 years round-trip.

Standing on it

A year here. A full year lasts about 8.5 Earth years.

By the numbers

Size. About 13.1× the width of Earth.
Volume. About 2248 Earths could fit inside it.
Mass. Roughly 114× 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 -146°C — colder than dry ice.

How we found it

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

Properties

density gcc: 0.278
discovery facility: Las Campanas Observatory
discovery method: Radial Velocity
dist ly: 204.689
eccentricity: 0.11
eq temp k: 127.34
insolation: 0.0438
mass earth: 113.9
name: HD 102843 b
orbital period days: 3090.942
radius earth: 13.1
sys num planets: 1

About HD 102843 b

HD 102843 b is an uncommon exoplanet. It lies about 204.7 light-years from Earth, has an equilibrium temperature near 127 K, spans roughly 13.1 Earth radii and weighs about 113.9 Earth masses.

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

How to see it

Like any astronomical target, HD 102843 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 102843 b is an uncommon exoplanet

HD 102843 b 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, Frozen world and Puffy low-density world — 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.