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Rare exoplanet 44 EP

HD 213472 b

RA 337.7070° · Dec 40.7222° · exoplanet

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Score breakdown

· 6 badges
44 pts · Rare
Rare 50 pts → Epic
  • Long-period world +10
  • Eccentric orbit +9
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 44

6 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Eccentric orbit · +9
  • Orbits a Sun-like star · +8

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. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

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 8.2 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 August — 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. ≈ 3.7 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
2.72
diameter km
167106.22
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2021
dist ly
210.2163
eccentricity
0.53
eq temp k
91.76
host star teff
5729.54
insolation
0.0114
mag
8.17
mass earth
1112.3994
name
HD 213472 b
orbital period days
17000
radius earth
13.1
semi major au
13
sys num planets
1
sys num stars
1

About HD 213472 b

HD 213472 b is a rare exoplanet. It lies about 210.2 light-years from Earth, shines at apparent magnitude 8.17, has an equilibrium temperature near 92 K and spans roughly 13.1 Earth radii.

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

How to see it

At apparent magnitude 8.17, it is an easy target for binoculars.

Like any astronomical target, HD 213472 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 213472 b is a rare exoplanet

HD 213472 b scores 44 points on Spacedle's rarity scale, which places it in the rare tier. Another 6 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world, Eccentric orbit and Orbits a Sun-like star — 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.