Uncommon exoplanet 27 EP

HD 29985 b

RA 70.5217° · Dec -33.9211° · exoplanet

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Score breakdown

· 4 badges

27 pts · Uncommon

Uncommon 33 pts → Rare

Long-period world +10
Frozen world +8
Confirmed exoplanet +5
Gas giant +4

Total score 27

6 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Frozen world · +8
Long-period world · +10

Trivia

What makes it special

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

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 1.8 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 159.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1020 years in a starship at a tenth of light speed.
Distance. 102 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1924.

Saying hello

Say hello. A radio message and its reply would take 204 years round-trip.

Standing on it

A year here. A full year lasts about 56.4 Earth years.

By the numbers

Size. About 12.8× the width of Earth.
Volume. About 2097 Earths could fit inside it.
Mass. Roughly 1739× Earth's mass — about 5.5 Jupiters.
Your weight. You'd weigh about 10.6× your Earth weight standing here.
Temperature. A frigid -226°C — colder than dry ice.

How we found it

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

Properties

density gcc: 4.56
discovery facility: Multiple Observatories
discovery method: Radial Velocity
dist ly: 101.9913
eccentricity: 0.261
eq temp k: 46.73
insolation: 0.0008
mass earth: 1739.4749
name: HD 29985 b
orbital period days: 20608.1405
radius earth: 12.8
sys num planets: 1

About HD 29985 b

HD 29985 b is an uncommon exoplanet. It lies about 102 light-years from Earth, has an equilibrium temperature near 47 K, spans roughly 12.8 Earth radii and weighs about 1,739.47 Earth masses.

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

How to see it

Like any astronomical target, HD 29985 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 29985 b is an uncommon exoplanet

HD 29985 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, Frozen world and Long-period 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.