Uncommon exoplanet 28 EP

TOI-4640 b

RA 38.2053° · Dec 10.0725° · exoplanet

Loading sky survey…

🌌 View in 3D star map

Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 4 badges

28 pts · Uncommon

Uncommon 33 pts → Rare

Lava world +14
Confirmed exoplanet +5
Sub-Neptune +5
Found by TESS +4

Total score 28

5 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Sub-Neptune · +5
Lava world · +14
Found by TESS · +4

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. ≈ 14 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 1.2 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 7994 years in a starship at a tenth of light speed.
Distance. 799 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1227.

Saying hello

Say hello. A radio message and its reply would take 1599 years round-trip.

Standing on it

A year here. A full year lasts just 2.7 Earth days.

By the numbers

Size. About 2.8× the width of Earth.
Volume. About 23 Earths could fit inside it.
Mass. About 8.5× the mass of Earth.
Your weight. You'd weigh about 1.0× your Earth weight standing here.
Temperature. Around 1106°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: 2.02
discovery facility: Transiting Exoplanet Survey Satellite (TESS)
discovery method: Transit
dist ly: 799.3725
eq temp k: 1378.86
insolation: 854.2741
mass earth: 8.46
name: TOI-4640 b
orbital period days: 2.6857
radius earth: 2.8433
sys num planets: 1

About TOI-4640 b

TOI-4640 b is an uncommon exoplanet. It lies about 799.4 light-years from Earth, has an equilibrium temperature near 1,379 K, spans roughly 2.84 Earth radii and weighs about 8.46 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, TOI-4640 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-4640 b is an uncommon exoplanet

TOI-4640 b scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Sub-Neptune, Lava world and Found by TESS — 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.