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Uncommon exoplanet 33 EP

TOI-6478 b

RA 149.9918° · Dec -16.1598° · exoplanet

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Score breakdown

· 5 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Two suns in its sky +12
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by TESS +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Found by TESS · +4
  • Orbits a red dwarf · +8
  • Two suns in its sky · +12

Trivia

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 16 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around February — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Getting there

  • Aboard Voyager 1. ≈ 2.2 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
1.08
diameter km
58678.52
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2025
dist ly
125.9148
eq temp k
204.4
host star teff
3230
inclination
89.898
insolation
0.0003
mag
15.99
mass earth
19.2
multi star system
yes
name
TOI-6478 b
orbital period days
34.005
radius earth
4.6
semi major au
0.1136
spect
M4.0+/-0.5
sys num planets
1
sys num stars
2

About TOI-6478 b

TOI-6478 b is an uncommon exoplanet. It lies about 125.9 light-years from Earth, shines at apparent magnitude 15.99, has spectral type M4.0+/-0.5 and has an equilibrium temperature near 204 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 15.99, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, TOI-6478 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-6478 b is an uncommon exoplanet

TOI-6478 b scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Neptune-like, Found by TESS, Orbits a red dwarf and Two suns in its sky — 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.