Uncommon exoplanet 25 EP

Kepler-129 d

RA 285.3112° · Dec 47.8485° · exoplanet

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Score breakdown

· 4 badges

25 pts · Uncommon

Uncommon 33 pts → Rare

Distant (>1000 ly) +10
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 25

8 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Multi-planet system · +6
Distant (>1000 ly) · +10

Trivia

Could we get there?

Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

Aboard Voyager 1. ≈ 23.4 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 2.1 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 13.3 thousand years in a starship at a tenth of light speed.
Distance. 1333 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 693.

Saying hello

Say hello. A radio message and its reply would take 2667 years round-trip.

Standing on it

A year here. A full year lasts about 7.2 Earth years.

By the numbers

Size. About 12.6× the width of Earth.
Volume. About 2000 Earths could fit inside it.
Mass. Roughly 2638× Earth's mass — about 8.3 Jupiters.
Your weight. You'd weigh about 16.6× your Earth weight standing here.
Temperature. A frigid -94°C — colder than dry ice.

How we found it

Discovery. Found by W. M. Keck Observatory using the radial velocity method.

Cosmic context

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

Properties

density gcc: 7.25
discovery facility: W. M. Keck Observatory
discovery method: Radial Velocity
dist ly: 1333.4725
eccentricity: 0.15
eq temp k: 178.86
insolation: 0.1818
mass earth: 2637.9758
name: Kepler-129 d
orbital period days: 2646
radius earth: 12.6
sys num planets: 3

About Kepler-129 d

Kepler-129 d is an uncommon exoplanet. It lies about 1,333.5 light-years from Earth, has an equilibrium temperature near 179 K, spans roughly 12.6 Earth radii and weighs about 2,637.98 Earth masses.

One of at least 3 planets orbiting its star.

How to see it

Like any astronomical target, Kepler-129 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 Kepler-129 d is an uncommon exoplanet

Kepler-129 d scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Multi-planet system and Distant (>1000 ly) — 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.