Rare exoplanet 37 EP

TOI-858 B b

RA 60.1998° · Dec -54.5929° · exoplanet

Loading sky survey…

🌌 View in 3D star map

Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 5 badges

37 pts · Rare

Rare 46 pts → Epic

Lava world +14
Hot Jupiter +10
Confirmed exoplanet +5
Gas giant +4
Found by TESS +4

Total score 37

9 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
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. ≈ 14.4 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 1.3 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 8170 years in a starship at a tenth of light speed.
Distance. 817 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1209.

Saying hello

Say hello. A radio message and its reply would take 1634 years round-trip.

Standing on it

A year here. A full year lasts just 3.3 Earth days.

By the numbers

Size. About 14.1× the width of Earth.
Volume. About 2784 Earths could fit inside it.
Mass. Roughly 350× Earth's mass — about 1.1 Jupiters.
Your weight. You'd weigh about 1.8× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 1256°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: 0.69
discovery facility: Transiting Exoplanet Survey Satellite (TESS)
discovery method: Transit
dist ly: 816.9849
eccentricity: 0.15
eq temp k: 1529
insolation: 908.9
mass earth: 349.6112
name: TOI-858 B b
orbital period days: 3.2797
radius earth: 14.0673
sys num planets: 1

About TOI-858 B b

TOI-858 B b is a rare exoplanet. It lies about 817 light-years from Earth, has an equilibrium temperature near 1,529 K, spans roughly 14.07 Earth radii and weighs about 349.61 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, TOI-858 B 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-858 B b is a rare exoplanet

TOI-858 B b scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, 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.