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Rare exoplanet 44 EP

HD 181234 b

RA 289.9999° · Dec -9.3250° · 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.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 8.6 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Could we get there?

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

Properties

density gcc
8.39
diameter km
159452.5
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2019
dist ly
155.7258
eccentricity
0.726
eq temp k
98.09
host star teff
5386
inclination
98.732
insolation
0.0144
mag
8.59
mass earth
2980.9126
name
HD 181234 b
orbital period days
7593.4051
radius earth
12.5
semi major au
7.427
spect
G8 IV
sys num planets
1
sys num stars
1

About HD 181234 b

HD 181234 b is a rare exoplanet. It lies about 155.7 light-years from Earth, shines at apparent magnitude 8.59, has spectral type G8 IV and has an equilibrium temperature near 98 K.

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

How to see it

At apparent magnitude 8.59, it is an easy target for binoculars.

Like any astronomical target, HD 181234 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 181234 b is a rare exoplanet

HD 181234 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.