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Common exoplanet 21 EP

eps CrB b

RA 239.3965° · Dec 26.8776° · exoplanet

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Score breakdown

· 3 badges
21 pts · Common
Common 22 pts → Uncommon
  • Its star is visible to the naked eye +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 21

1 more point to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Its star is visible to the naked eye · +12

Trivia

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 4.1 you can see it with your own eyes from a dark site.
  • 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 May — 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. ≈ 4 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 355.8 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
5.71
diameter km
162003.74
discovery facility
Bohyunsan Optical Astronomical Observatory
discovery method
Radial Velocity
discovery year
2012
dist ly
227.8797
eccentricity
0.11
eq temp k
853.92
host star teff
4406
insolation
101.7001
mag
4.1258
mass earth
2129.461
name
eps CrB b
orbital period days
417.9
radius earth
12.7
semi major au
1.3
spect
K2 III
sys num planets
1
sys num stars
1

About eps CrB b

eps CrB b is a common exoplanet. It lies about 227.9 light-years from Earth, shines at apparent magnitude 4.13, has spectral type K2 III and has an equilibrium temperature near 854 K.

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

How to see it

At apparent magnitude 4.13, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, eps CrB 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 CrB b is a common exoplanet

eps CrB b scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant 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.