Rare exoplanet 45 EP

HD 109988 b

RA 189.8155° · Dec -32.7264° · exoplanet

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Score breakdown

· 5 badges

45 pts · Rare

Rare 46 pts → Epic

Denser than iron +18
Long-period world +10
Frozen world +8
Confirmed exoplanet +5
Gas giant +4

Total score 45

1 more point to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Frozen world · +8
Long-period world · +10
Denser than iron · +18

Trivia

What makes it special

Frozen world. A deep-frozen world far from its star's warmth.
Heavyweight. Packed denser than solid iron.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 2.4 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 216.6 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1387 years in a starship at a tenth of light speed.
Distance. 139 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1887.

Saying hello

Say hello. A radio message and its reply would take 277 years round-trip.

Standing on it

A year here. A full year lasts about 46.9 Earth years.

By the numbers

Size. About 12.1× the width of Earth.
Volume. About 1772 Earths could fit inside it.
Mass. Roughly 6935× Earth's mass — about 21.8 Jupiters.
Your weight. You'd weigh about 47.4× your Earth weight standing here.
Density. Denser than solid iron.
Temperature. A frigid -207°C — colder than dry ice.

How we found it

Discovery. Found by Multiple Observatories using the radial velocity method.

Properties

density gcc: 21.5
discovery facility: Multiple Observatories
discovery method: Radial Velocity
dist ly: 138.7073
eccentricity: 0.056
eq temp k: 65.91
insolation: 0.0031
mass earth: 6935.3337
name: HD 109988 b
orbital period days: 17132.1585
radius earth: 12.1
sys num planets: 1

About HD 109988 b

HD 109988 b is a rare exoplanet. It lies about 138.7 light-years from Earth, has an equilibrium temperature near 66 K, spans roughly 12.1 Earth radii and weighs about 6,935.33 Earth masses.

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

How to see it

Like any astronomical target, HD 109988 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 109988 b is a rare exoplanet

HD 109988 b scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world and Denser than iron — 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.