Rare exoplanet 37 EP

HD 219828 b

RA 349.6947° · Dec 18.6458° · exoplanet

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Score breakdown

· 5 badges

37 pts · Rare

Rare 46 pts → Epic

Lava world +14
Blasted by starlight +8
Multi-planet system +6
Confirmed exoplanet +5
Neptune-like +4

Total score 37

9 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Neptune-like · +4
Lava world · +14
Multi-planet system · +6
Blasted by starlight · +8

Trivia

What makes it special

Lava world. Its surface is likely an ocean of molten rock.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 4.2 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 372.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 2385 years in a starship at a tenth of light speed.
Distance. 238 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1788.

Saying hello

Say hello. A radio message and its reply would take 477 years round-trip.

Standing on it

A year here. A full year lasts just 3.8 Earth days.

By the numbers

Size. About 4.6× the width of Earth.
Volume. About 96.7 Earths could fit inside it.
Mass. About 19.1× the mass of Earth.
Your weight. You'd weigh about 0.9× your Earth weight standing here.
Temperature. Around 1330°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by La Silla Observatory using the radial velocity method.

Cosmic context

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

Properties

density gcc: 1.08
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 238.4657
eccentricity: 0.091
eq temp k: 1602.83
insolation: 1095.4885
mass earth: 19.0697
name: HD 219828 b
orbital period days: 3.8348
radius earth: 4.59
sys num planets: 2

About HD 219828 b

HD 219828 b is a rare exoplanet. It lies about 238.5 light-years from Earth, has an equilibrium temperature near 1,603 K, spans roughly 4.59 Earth radii and weighs about 19.07 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, HD 219828 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 219828 b is a rare exoplanet

HD 219828 b scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Neptune-like, Lava world, Multi-planet system and Blasted by starlight — 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.