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Uncommon exoplanet 25 EP

HD 154345 b

RA 255.6525° · Dec 47.0856° · exoplanet

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Score breakdown

· 4 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 25

9 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • 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

  • 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.

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 6.8 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 June — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.806
diameter km
174759.94
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2006
dist ly
59.6344
eccentricity
0.058
eq temp k
119.21
host star teff
5468
inclination
88
insolation
0.0349
mag
6.76
mass earth
376.9445
name
HD 154345 b
orbital period days
3280
radius earth
13.7
semi major au
4.158
spect
G8
sys num planets
1
sys num stars
1

About HD 154345 b

HD 154345 b is an uncommon exoplanet. It lies about 59.6 light-years from Earth, shines at apparent magnitude 6.76, has spectral type G8 and has an equilibrium temperature near 119 K.

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

How to see it

At apparent magnitude 6.76, it is an easy target for binoculars.

Like any astronomical target, HD 154345 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 154345 b is an uncommon exoplanet

HD 154345 b scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Frozen world 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.