Rare exoplanet 41 EP

HD 143105 b

RA 238.4024° · Dec 68.7200° · exoplanet

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Score breakdown

· 5 badges

41 pts · Rare

Rare 46 pts → Epic

Lava world +14
Hot Jupiter +10
Blasted by starlight +8
Confirmed exoplanet +5
Gas giant +4

Total score 41

5 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Lava world · +14
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. ≈ 2.7 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 238.2 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1526 years in a starship at a tenth of light speed.
Distance. 153 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1873.

Saying hello

Say hello. A radio message and its reply would take 305 years round-trip.

Standing on it

A year here. A full year lasts just 2.2 Earth days.

By the numbers

Size. About 13.7× the width of Earth.
Volume. About 2571 Earths could fit inside it.
Mass. Roughly 385× Earth's mass — about 1.2 Jupiters.
Your weight. You'd weigh about 2.0× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 2028 K — hot enough to vaporise iron.

How we found it

Discovery. Found by Haute-Provence Observatory using the radial velocity method.

Properties

density gcc: 0.822
discovery facility: Haute-Provence Observatory
discovery method: Radial Velocity
dist ly: 152.5722
eccentricity: 0.07
eq temp k: 2028.25
insolation: 2502.0025
mass earth: 384.5743
name: HD 143105 b
orbital period days: 2.1974
radius earth: 13.7
sys num planets: 1

About HD 143105 b

HD 143105 b is a rare exoplanet. It lies about 152.6 light-years from Earth, has an equilibrium temperature near 2,028 K, spans roughly 13.7 Earth radii and weighs about 384.57 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, HD 143105 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 143105 b is a rare exoplanet

HD 143105 b scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Lava world 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.