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Uncommon exoplanet 29 EP

TOI-4010 c

RA 20.2148° · Dec 66.0722° · exoplanet

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Score breakdown

· 5 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by TESS +4
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Tidally locked · +10
  • Multi-planet system · +6
  • Found by TESS · +4

Trivia

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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.
  • Crowded system. One of at least 4 planets orbiting its star.

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 12.3 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around October — that's when to go looking.

Properties

density gcc
0.5
diameter km
75644.266
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2023
dist ly
578.9399
eccentricity
0.03
eq temp k
907
host star teff
4960
inclination
88.8
insolation
112
mag
12.291
mass earth
20.31
name
TOI-4010 c
orbital period days
5.4147
radius earth
5.93
semi major au
0.058
spect
K V
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-4010 c

TOI-4010 c is an uncommon exoplanet. It lies about 578.9 light-years from Earth, shines at apparent magnitude 12.29, has spectral type K V and has an equilibrium temperature near 907 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 12.29, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, TOI-4010 c 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-4010 c is an uncommon exoplanet

TOI-4010 c scores 29 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 5 science badges — Confirmed exoplanet, Neptune-like, Tidally locked, Multi-planet system 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.