Rare exoplanet 45 EP

HD 219134 b

RA 348.3372° · Dec 57.1696° · exoplanet

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Score breakdown

· 5 badges

45 pts · Rare

Rare 46 pts → Epic

Richly packed system +14
Nearby (<25 ly) +12
Super-Earth +8
Multi-planet system +6
Confirmed exoplanet +5

Total score 45

1 more point to reach Epic.

Badges

Confirmed exoplanet · +5
Super-Earth · +8
Multi-planet system · +6
Richly packed system · +14
Nearby (<25 ly) · +12

Trivia

What makes it special

Packed system. Crammed into a system of five or more planets.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 374.3 thousand years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 33.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 213 years in a starship at a tenth of light speed.
Distance. 21.3 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 2005.

Saying hello

Say hello. A radio message and its reply would take 42.6 years round-trip.

Standing on it

A year here. A full year lasts just 3.1 Earth days.

By the numbers

Size. About 1.6× the width of Earth.
Volume. About 4.1 Earths could fit inside it.
Mass. About 4.7× the mass of Earth.
Your weight. You'd weigh about 1.8× your Earth weight standing here.
Temperature. Around 742°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by Roque de los Muchachos Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 6 planets orbiting its star.

Properties

density gcc: 6.34
discovery facility: Roque de los Muchachos Observatory
discovery method: Radial Velocity
dist ly: 21.3021
eccentricity: 0
eq temp k: 1015
insolation: 176.2
mass earth: 4.74
name: HD 219134 b
orbital period days: 3.0929
radius earth: 1.602
sys num planets: 6

About HD 219134 b

HD 219134 b is a rare exoplanet. It lies about 21.3 light-years from Earth, has an equilibrium temperature near 1,015 K, spans roughly 1.6 Earth radii and weighs about 4.74 Earth masses.

Crammed into a system of five or more planets.

How to see it

Like any astronomical target, HD 219134 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 219134 b is a rare exoplanet

HD 219134 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, Super-Earth, Multi-planet system, Richly packed system and Nearby (<25 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.