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Rare exoplanet 36 EP

HD 222237 b

RA 354.9079° · Dec -72.7253° · exoplanet

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Score breakdown

· 5 badges
36 pts · Rare
Rare 50 pts → Epic
  • Long-period world +10
  • Eccentric orbit +9
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 36

14 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Eccentric orbit · +9

Trivia

What makes it special

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

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

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 7.1 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 656.1 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
4.32
diameter km
163279.36
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2024
dist ly
37.3348
eccentricity
0.56
eq temp k
58.74
host star teff
4751
inclination
49.9
insolation
0.0019
mag
7.09
mass earth
1649.5294
name
HD 222237 b
orbital period days
14892
radius earth
12.8
semi major au
10.8
spect
K3 V
sys num planets
1
sys num stars
1

About HD 222237 b

HD 222237 b is a rare exoplanet. It lies about 37.3 light-years from Earth, shines at apparent magnitude 7.09, has spectral type K3 V and has an equilibrium temperature near 59 K.

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

How to see it

At apparent magnitude 7.09, it is an easy target for binoculars.

Like any astronomical target, HD 222237 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 HD 222237 b is a rare exoplanet

HD 222237 b scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 14 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world and Eccentric orbit — 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.