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Rare exoplanet 39 EP

CoRoT-3 b

RA 292.0553° · Dec 0.1218° · exoplanet

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Score breakdown

· 5 badges
39 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 39

11 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 13.4 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 July — that's when to go looking.

Properties

density gcc
26.4
diameter km
144400.184
discovery facility
CoRoT
discovery method
Transit
discovery year
2008
dist ly
2507.3927
eccentricity
0
eq temp k
1695
host star teff
6740
inclination
85.9
insolation
735.4472
mag
13.448
mass earth
6883.91
name
CoRoT-3 b
orbital period days
4.2568
radius earth
11.32
semi major au
0.0578
spect
F3 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About CoRoT-3 b

CoRoT-3 b is a rare exoplanet. It lies about 2,507.4 light-years from Earth, shines at apparent magnitude 13.45, has spectral type F3 V and has an equilibrium temperature near 1,695 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 13.45, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, CoRoT-3 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 CoRoT-3 b is a rare exoplanet

CoRoT-3 b scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Lava world and Tidally locked — 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.