← Back to dex
Epic exoplanet 59 EP

TOI-3912 b

RA 215.8015° · Dec 24.0766° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 7 badges
59 pts · Epic
Epic 68 pts → Anomaly
  • Lava world +14
  • Puffy low-density world +12
  • Hot Jupiter +10
  • Distant (>1000 ly) +10
  • Confirmed exoplanet +5
  • Gas giant +4
  • Found by TESS +4
Total score 59

9 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Hot Jupiter · +10
  • Lava world · +14
  • Puffy low-density world · +12
  • 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. ≈ 26.7 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 2.4 million years even at the Parker Solar Probe's 192 km/s.
  • At 10% light speed. ≈ 15.2 thousand years in a starship at a tenth of light speed.
  • Distance. 1520 light-years from Earth.

Look-back time

  • Look-back time. The light you'd see left around the year 506.

Saying hello

  • Say hello. A radio message and its reply would take 3040 years round-trip.

Standing on it

  • A year here. A full year lasts just 3.5 Earth days.

By the numbers

  • Size. About 14.3× the width of Earth.
  • Volume. About 2912 Earths could fit inside it.
  • Mass. Roughly 129× Earth's mass — about 0.4 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 1239°C — hotter than a self-cleaning oven.

How we found it

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

Properties

density gcc
0.243
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
dist ly
1519.8609
eccentricity
0
eq temp k
1512
insolation
872.2
mass earth
129.0383
name
TOI-3912 b
orbital period days
3.4936
radius earth
14.2802
sys num planets
1

About TOI-3912 b

TOI-3912 b is an epic exoplanet. It lies about 1,519.9 light-years from Earth, has an equilibrium temperature near 1,512 K, spans roughly 14.28 Earth radii and weighs about 129.04 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, TOI-3912 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-3912 b is an epic exoplanet

TOI-3912 b scores 59 points on Spacedle's rarity scale, which places it in the epic tier. Another 9 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, 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.