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Epic exoplanet 55 EP

HD 133131 A c

RA 225.8985° · Dec -27.8431° · exoplanet

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Score breakdown

· 7 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • Puffy low-density world +12
  • Two suns in its sky +12
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 55

23 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Puffy low-density world · +12
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8
  • Two suns in its sky · +12

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 3 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 7.7 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around May — that's when to go looking.

Properties

density gcc
0.251
diameter km
182413.66
discovery facility
Las Campanas Observatory
discovery method
Radial Velocity
discovery year
2016
dist ly
167.8842
eccentricity
0.49
eq temp k
128.96
host star teff
5799
insolation
0.0477
mag
7.66
mass earth
133.4886
multi star system
yes
name
HD 133131 A c
orbital period days
3568
radius earth
14.3
semi major au
4.49
spect
G2 V
sys num planets
3
sys num stars
2

Nearby objects

About HD 133131 A c

HD 133131 A c is an epic exoplanet. It lies about 167.9 light-years from Earth, shines at apparent magnitude 7.66, has spectral type G2 V and has an equilibrium temperature near 129 K.

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

How to see it

At apparent magnitude 7.66, it is an easy target for binoculars.

Like any astronomical target, HD 133131 A 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 133131 A c is an epic exoplanet

HD 133131 A c scores 55 points on Spacedle's rarity scale, which places it in the epic tier. Another 23 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Frozen world, Puffy low-density world, Multi-planet system, 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.