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Rare exoplanet 41 EP

eps Eri b

RA 53.2284° · Dec -9.4582° · exoplanet

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Score breakdown

· 5 badges
41 pts · Rare
Rare 50 pts → Epic
  • Nearby (<25 ly) +12
  • Its star is visible to the naked eye +12
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 41

9 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Nearby (<25 ly) · +12
  • Gas giant · +4
  • Frozen world · +8
  • 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.

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 3.7 you can see it with your own eyes from a dark site.
  • 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 November — that's when to go looking.

Could we get there?

  • Verdict. A multi-generation starship could one day attempt the crossing.

Properties

density gcc
0.665
diameter km
176035.56
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2000
dist ly
10.4455
eccentricity
0.06
eq temp k
112.26
host star teff
5020.38
inclination
40
insolation
0.0306
mag
3.7155
mass earth
317.8284
name
eps Eri b
orbital period days
2680
radius earth
13.8
semi major au
3.53
spect
K2 V
sys num planets
1
sys num stars
1

About eps Eri b

eps Eri b is a rare exoplanet. It lies about 10.4 light-years from Earth, shines at apparent magnitude 3.72, has spectral type K2 V and has an equilibrium temperature near 112 K.

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

How to see it

At apparent magnitude 3.72, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, eps Eri 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 eps Eri b is a rare exoplanet

eps Eri b scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Nearby (<25 ly), Gas giant, Frozen world 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.