Uncommon exoplanet 27 EP

HIP 65407 b

RA 201.0877° · Dec 48.8847° · 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. ≈ 314.6 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 2015 years in a starship at a tenth of light speed.
Distance. 202 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1824.

Saying hello

Say hello. A radio message and its reply would take 403 years round-trip.

Standing on it

A year here. A full year lasts just 28.1 Earth days.

By the numbers

Size. About 14.3× the width of Earth.
Volume. About 2924 Earths could fit inside it.
Mass. Roughly 136× 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 scorching 338°C on average.

How we found it

Discovery. Found by Haute-Provence Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 2 planets orbiting its star.

Properties

density gcc: 0.256
discovery facility: Haute-Provence Observatory
discovery method: Radial Velocity
dist ly: 201.5005
eccentricity: 0.14
eq temp k: 610.68
insolation: 20.7979
mass earth: 136.0312
name: HIP 65407 b
orbital period days: 28.125
radius earth: 14.3
sys num planets: 2

About HIP 65407 b

HIP 65407 b is an uncommon exoplanet. It lies about 201.5 light-years from Earth, has an equilibrium temperature near 611 K, spans roughly 14.3 Earth radii and weighs about 136.03 Earth masses.

So low-density it would float on water.

How to see it

Like any astronomical target, HIP 65407 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 HIP 65407 b is an uncommon exoplanet

HIP 65407 b 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.