Epic exoplanet 63 EP

HATS-39 b

RA 112.4192° · Dec -29.9379° · exoplanet

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Score breakdown

· 7 badges

63 pts · Epic

Epic 68 pts → Anomaly

Lava world +14
Puffy low-density world +12
Hot Jupiter +10
Distant (>1000 ly) +10
Blasted by starlight +8
Confirmed exoplanet +5
Gas giant +4

Total score 63

5 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Lava world · +14
Puffy low-density world · +12
Blasted by starlight · +8
Distant (>1000 ly) · +10

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

Getting there

Aboard Voyager 1. ≈ 50.4 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 4.5 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 28.7 thousand years in a starship at a tenth of light speed.
Distance. 2865 light-years from Earth.

Look-back time

Look-back time. Its light left before the last ice age ended.

Saying hello

Say hello. A radio message and its reply would take 5731 years round-trip.

Standing on it

A year here. A full year lasts just 4.6 Earth days.

By the numbers

Size. About 17.6× the width of Earth.
Volume. About 5450 Earths could fit inside it.
Mass. Roughly 200× Earth's mass — about 0.6 Jupiters.
Your weight. You'd weigh about 0.6× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 1372°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by HATSouth using the transit method.

Properties

density gcc: 0.202
discovery facility: HATSouth
discovery method: Transit
dist ly: 2865.349
eccentricity: 0.275
eq temp k: 1645
insolation: 1547.1014
mass earth: 200.2329
name: HATS-39 b
orbital period days: 4.5776
radius earth: 17.5981
sys num planets: 1

About HATS-39 b

HATS-39 b is an epic exoplanet. It lies about 2,865.3 light-years from Earth, has an equilibrium temperature near 1,645 K, spans roughly 17.6 Earth radii and weighs about 200.23 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, HATS-39 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 HATS-39 b is an epic exoplanet

HATS-39 b scores 63 points on Spacedle's rarity scale, which places it in the epic tier. Another 5 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Lava world, Puffy low-density world, Blasted by starlight 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.