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Uncommon exoplanet 31 EP

CD Cet b

RA 48.3530° · Dec 4.7752° · exoplanet

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Score breakdown

· 4 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Super-Earth +8
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10
  • Orbits a red dwarf · +8

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 13.9 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around November — 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. ≈ 493.3 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
3.6
diameter km
23216.284
discovery facility
Calar Alto Observatory
discovery method
Radial Velocity
discovery year
2020
dist ly
28.0727
eq temp k
464
host star teff
3130
inclination
87.48
insolation
8.6
mag
13.95
mass earth
3.95
name
CD Cet b
orbital period days
2.2907
radius earth
1.82
semi major au
0.0185
spect
M5.0 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About CD Cet b

CD Cet b is an uncommon exoplanet. It lies about 28.1 light-years from Earth, shines at apparent magnitude 13.95, has spectral type M5.0 V and has an equilibrium temperature near 464 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 13.95, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, CD Cet 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 CD Cet b is an uncommon exoplanet

CD Cet b scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, Tidally locked and Orbits a red dwarf — 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.