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Epic exoplanet 67 EP

HD 219134 h

RA 348.3372° · Dec 57.1696° · exoplanet

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Score breakdown

· 7 badges
67 pts · Epic
Epic 78 pts → Anomaly
  • Richly packed system +14
  • Nearby (<25 ly) +12
  • Puffy low-density world +12
  • Its star is visible to the naked eye +12
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 67

11 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Nearby (<25 ly) · +12
  • Gas giant · +4
  • Frozen world · +8
  • Puffy low-density world · +12
  • Richly packed system · +14
  • Its star is visible to the naked eye · +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 6 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 5.6 you can see it with your own eyes from a dark site.
  • 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 September — that's when to go looking.

Properties

density gcc
0.29
diameter km
162003.74
discovery facility
Roque de los Muchachos Observatory
discovery method
Radial Velocity
discovery year
2015
dist ly
21.3021
eccentricity
0.06
eq temp k
117.88
host star teff
4913
insolation
0.0321
mag
5.5691
mass earth
108.0622
name
HD 219134 h
orbital period days
2247
radius earth
12.7
semi major au
3.11
spect
K3 V
sys num planets
6
sys num stars
1

About HD 219134 h

HD 219134 h is an epic exoplanet. It lies about 21.3 light-years from Earth, shines at apparent magnitude 5.57, has spectral type K3 V and has an equilibrium temperature near 118 K.

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

How to see it

At apparent magnitude 5.57, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 219134 h 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 219134 h is an epic exoplanet

HD 219134 h scores 67 points on Spacedle's rarity scale, which places it in the epic tier. Another 11 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Nearby (<25 ly), Gas giant, Frozen world, Puffy low-density world, Richly packed system and Its star is visible to the naked eye — 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.