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Uncommon exoplanet 31 EP

GJ 1148 c

RA 175.4326° · Dec 42.7516° · exoplanet

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Score breakdown

· 5 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Frozen world +8
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Multi-planet system · +6
  • Orbits a red dwarf · +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.
  • Crowded system. One of at least 2 planets orbiting its star.

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 11.9 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 March — that's when to go looking.

Properties

density gcc
0.409
diameter km
123862.702
discovery facility
Calar Alto Observatory
discovery method
Radial Velocity
discovery year
2017
dist ly
35.9238
eccentricity
0.342
eq temp k
99.38
host star teff
3287
insolation
0.0163
mag
11.939
mass earth
68.06
name
GJ 1148 c
orbital period days
532.58
radius earth
9.71
semi major au
0.912
spect
M5
sys num planets
2
sys num stars
1

About GJ 1148 c

GJ 1148 c is an uncommon exoplanet. It lies about 35.9 light-years from Earth, shines at apparent magnitude 11.94, has spectral type M5 and has an equilibrium temperature near 99 K.

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

How to see it

At apparent magnitude 11.94, a small backyard telescope will bring it into view.

Like any astronomical target, GJ 1148 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 GJ 1148 c is an uncommon exoplanet

GJ 1148 c scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Multi-planet system and Orbits a red dwarf — 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.