Rare exoplanet 45 EP

HAT-P-1 b

RA 344.4454° · Dec 38.6749° · exoplanet

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Score breakdown

· 5 badges

45 pts · Rare

Rare 46 pts → Epic

Lava world +14
Puffy low-density world +12
Hot Jupiter +10
Confirmed exoplanet +5
Gas giant +4

Total score 45

1 more point to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Lava world · +14
Puffy low-density world · +12

Trivia

What makes it special

Lava world. Its surface is likely an ocean of molten rock.
Cotton-candy planet. So low-density it would float on water.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 9.1 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 809.6 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 5185 years in a starship at a tenth of light speed.
Distance. 519 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1507.

Saying hello

Say hello. A radio message and its reply would take 1037 years round-trip.

Standing on it

A year here. A full year lasts just 4.5 Earth days.

By the numbers

Size. About 14.8× the width of Earth.
Volume. About 3232 Earths could fit inside it.
Mass. Roughly 167× Earth's mass — about 0.5 Jupiters.
Your weight. You'd weigh about 0.8× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 1049°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by HATNet using the transit method.

Properties

density gcc: 0.282
discovery facility: HATNet
discovery method: Transit
dist ly: 518.5195
eccentricity: 0
eq temp k: 1322
insolation: 259.687
mass earth: 166.8607
name: HAT-P-1 b
orbital period days: 4.4653
radius earth: 14.7847
sys num planets: 1

About HAT-P-1 b

HAT-P-1 b is a rare exoplanet. It lies about 518.5 light-years from Earth, has an equilibrium temperature near 1,322 K, spans roughly 14.78 Earth radii and weighs about 166.86 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, HAT-P-1 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 HAT-P-1 b is a rare exoplanet

HAT-P-1 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, Gas giant, Hot Jupiter, Lava world and Puffy low-density 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.