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Common exoplanet 15 EP

HD 200964 c

RA 316.6664° · Dec 3.8033° · exoplanet

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Score breakdown

· 3 badges
15 pts · Common
Common 22 pts → Uncommon
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 15

7 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Multi-planet system · +6

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.
  • Crowded system. One of at least 2 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 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 August — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
0.825
diameter km
174759.94
discovery facility
Lick Observatory
discovery method
Radial Velocity
discovery year
2010
dist ly
236.7638
eccentricity
0.243
eq temp k
380.62
host star teff
4982
insolation
3.0164
mag
6.486
mass earth
385.8456
name
HD 200964 c
orbital period days
852.5
radius earth
13.7
semi major au
1.96
spect
G8 IV
sys num planets
2
sys num stars
1

Nearby objects

About HD 200964 c

HD 200964 c is a common exoplanet. It lies about 236.8 light-years from Earth, shines at apparent magnitude 6.49, has spectral type G8 IV and has an equilibrium temperature near 381 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 6.49, it is an easy target for binoculars.

Like any astronomical target, HD 200964 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 HD 200964 c is a common exoplanet

HD 200964 c scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Multi-planet system — 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.