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Rare exoplanet 35 EP

CoRoT-9 b

RA 280.7866° · Dec 6.2041° · exoplanet

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Score breakdown

· 5 badges
35 pts · Rare
Rare 50 pts → Epic
  • Two suns in its sky +12
  • Orbits a Sun-like star +8
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 35

15 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Orbits a Sun-like star · +8
  • Two suns in its sky · +12

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

  • 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 13.6 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.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 23.7 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.86
diameter km
152421.206
discovery facility
CoRoT
discovery method
Transit
discovery year
2009
dist ly
1346.959
eccentricity
0.133
eq temp k
420
host star teff
5625
inclination
89.9
insolation
3.444
mag
13.637
mass earth
266.9772
multi star system
yes
name
CoRoT-9 b
orbital period days
95.2727
radius earth
11.9488
semi major au
0.4021
spect
G3 V
sys num planets
1
sys num stars
2

About CoRoT-9 b

CoRoT-9 b is a rare exoplanet. It lies about 1,347 light-years from Earth, shines at apparent magnitude 13.64, has spectral type G3 V and has an equilibrium temperature near 420 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

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, CoRoT-9 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-9 b is a rare exoplanet

CoRoT-9 b scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 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, Orbits a Sun-like star 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.