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Common exoplanet 17 EP

GJ 649 b

RA 254.5363° · Dec 25.7420° · exoplanet

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Score breakdown

· 3 badges
17 pts · Common
Common 22 pts → Uncommon
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 17

5 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8

Trivia

What makes it special

  • Frozen world. A deep-frozen world, too far from its star's warmth for anything to stay liquid.

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. 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 9.7 you'll want a small backyard telescope.
  • 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 June — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.358
diameter km
137766.96
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
33.8537
eccentricity
0.083
eq temp k
120.74
host star teff
3734
insolation
0.0352
mag
9.7
mass earth
81.9997
name
GJ 649 b
orbital period days
600.1
radius earth
10.8
semi major au
1.112
spect
M1.0
sys num planets
1
sys num stars
1

About GJ 649 b

GJ 649 b is a common exoplanet. It lies about 33.9 light-years from Earth, shines at apparent magnitude 9.7, has spectral type M1.0 and has an equilibrium temperature near 121 K.

A deep-frozen world, too far from its star's warmth for anything to stay liquid.

How to see it

At apparent magnitude 9.7, a small backyard telescope will bring it into view.

Like any astronomical target, GJ 649 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 GJ 649 b is a common exoplanet

GJ 649 b scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Frozen world — 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.