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Epic exoplanet 67 EP

TOI-4329 b

RA 329.5639° · Dec 71.1316° · exoplanet

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Score breakdown

· 8 badges
67 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
  • Found by TESS +4
Total score 67

1 more point 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
  • Found by TESS · +4
  • 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. ≈ 41.1 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 3.7 million years even at the Parker Solar Probe's 192 km/s.
  • At 10% light speed. ≈ 23.4 thousand years in a starship at a tenth of light speed.
  • Distance. 2339 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 4678 years round-trip.

Standing on it

  • A year here. A full year lasts just 2.9 Earth days.

By the numbers

  • Size. About 16.8× the width of Earth.
  • Volume. About 4753 Earths could fit inside it.
  • Mass. Roughly 143× Earth's mass — about 0.5 Jupiters.
  • Your weight. You'd weigh about 0.5× your Earth weight standing here.
  • Density. Less dense than water — drop it in a big enough ocean and it would float.
  • Temperature. Around 2027 K — hot enough to vaporise iron.

How we found it

  • Discovery. Found by Transiting Exoplanet Survey Satellite (TESS) using the transit method.

Properties

density gcc
0.165
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
dist ly
2338.956
eccentricity
0.068
eq temp k
2027.12
insolation
3990.5716
mass earth
143.0228
name
TOI-4329 b
orbital period days
2.9223
radius earth
16.8135
sys num planets
1

About TOI-4329 b

TOI-4329 b is an epic exoplanet. It lies about 2,339 light-years from Earth, has an equilibrium temperature near 2,027 K, spans roughly 16.81 Earth radii and weighs about 143.02 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, TOI-4329 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 TOI-4329 b is an epic exoplanet

TOI-4329 b scores 67 points on Spacedle's rarity scale, which places it in the epic tier. Another 1 point would lift it into a rarer tier.

That score comes from 8 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Lava world, Puffy low-density world, Blasted by starlight, Found by TESS 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.

spacedle A daily roll through the real universe. © 2026 spacedle. Buy me a coffee

Sky imagery and survey data courtesy of Aladin Lite & CDS, Strasbourg. Object data from the NASA Exoplanet Archive, JPL Small-Body Database, and the ATNF Pulsar Catalogue.