Uncommon exoplanet 27 EP

HD 184010 d

RA 292.8401° · Dec 26.6173° · exoplanet

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Score breakdown

· 4 badges

27 pts · Uncommon

Uncommon 33 pts → Rare

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

Total score 27

6 more points to reach Rare.

Badges

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

Trivia

What makes it special

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. ≈ 3.5 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 309.6 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1983 years in a starship at a tenth of light speed.
Distance. 198 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1828.

Saying hello

Say hello. A radio message and its reply would take 397 years round-trip.

Standing on it

A year here. A full year lasts about 2.3 Earth years.

By the numbers

Size. About 14.3× the width of Earth.
Volume. About 2924 Earths could fit inside it.
Mass. Roughly 143× Earth's mass — about 0.5 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 scorching 108°C on average.

How we found it

Discovery. Found by Okayama Astrophysical Observatory using the radial velocity method.

Cosmic context

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

Properties

density gcc: 0.269
discovery facility: Okayama Astrophysical Observatory
discovery method: Radial Velocity
dist ly: 198.3006
eccentricity: 0
eq temp k: 381.37
insolation: 3.5509
mass earth: 143.0228
name: HD 184010 d
orbital period days: 836.4
radius earth: 14.3
sys num planets: 3

About HD 184010 d

HD 184010 d is an uncommon exoplanet. It lies about 198.3 light-years from Earth, has an equilibrium temperature near 381 K, spans roughly 14.3 Earth radii and weighs about 143.02 Earth masses.

So low-density it would float on water.

How to see it

Like any astronomical target, HD 184010 d 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 184010 d is an uncommon exoplanet

HD 184010 d scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

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