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Common exoplanet 18 EP

CI Tau c

RA 68.4668° · Dec 22.8416° · exoplanet

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Score breakdown

· 3 badges
18 pts · Common
Common 22 pts → Uncommon
  • Eccentric orbit +9
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 18

4 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Eccentric orbit · +9

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. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

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 13.6 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • 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. ≈ 9.1 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
2.86
diameter km
165830.6
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2024
dist ly
515.32
eccentricity
0.58
eq temp k
610.62
host star teff
3807
insolation
19.2542
mag
13.642
mass earth
1144.1823
name
CI Tau c
orbital period days
25.2
radius earth
13
semi major au
0.17
spect
K7
sys num planets
1
sys num stars
1

About CI Tau c

CI Tau c is a common exoplanet. It lies about 515.3 light-years from Earth, shines at apparent magnitude 13.64, has spectral type K7 and has an equilibrium temperature near 611 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 13.64, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, CI Tau 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 CI Tau c is a common exoplanet

CI Tau c scores 18 points on Spacedle's rarity scale, which places it in the common tier. Another 4 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Eccentric orbit — 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.