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Common exoplanet 21 EP

kap CrB b

RA 237.8080° · Dec 35.6559° · 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. 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 4.8 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. ≈ 1.7 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 153.1 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
1.61
diameter km
169657.46
discovery facility
Lick Observatory
discovery method
Radial Velocity
discovery year
2007
dist ly
98.0591
eccentricity
0.04
eq temp k
319.32
host star teff
4840
inclination
60
insolation
1.7376
mag
4.7973
mass earth
689.6911
name
kap CrB b
orbital period days
1253.68
radius earth
13.3
semi major au
2.5
spect
K0 III-IV
sys num planets
1
sys num stars
1

About kap CrB b

kap CrB b is a common exoplanet. It lies about 98.1 light-years from Earth, shines at apparent magnitude 4.8, has spectral type K0 III-IV and has an equilibrium temperature near 319 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 4.8, it can be glimpsed with the unaided eye under dark skies.

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

kap 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.