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Epic exoplanet 63 EP

rho CrB b

RA 240.2601° · Dec 33.3002° · exoplanet

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Score breakdown

· 7 badges
63 pts · Epic
Epic 78 pts → Anomaly
  • Found before the year 2000 +18
  • Its star is visible to the naked eye +12
  • Disputed — it may not be there at all +10
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 63

15 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Multi-planet system · +6
  • Its star is visible to the naked eye · +12
  • Orbits a Sun-like star · +8
  • Found before the year 2000 · +18
  • Disputed — it may not be there at all · +10

Trivia

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

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • 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.
  • Crowded system. One of at least 3 planets orbiting its star.

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 5.4 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.

Properties

controversial
yes
density gcc
0.744
diameter km
174759.94
discovery facility
Fred Lawrence Whipple Observatory
discovery method
Radial Velocity
discovery year
1997
dist ly
56.97
eccentricity
0.046
eq temp k
614
host star teff
5817
insolation
34.7
mag
5.4082
mass earth
347.995
name
rho CrB b
orbital period days
39.849
radius earth
13.7
semi major au
0.2245
spect
G0
sys num planets
3
sys num stars
1

About rho CrB b

rho CrB b is an epic exoplanet. It lies about 57 light-years from Earth, shines at apparent magnitude 5.41, has spectral type G0 and has an equilibrium temperature near 614 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 5.41, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, rho 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 rho CrB b is an epic exoplanet

rho CrB b scores 63 points on Spacedle's rarity scale, which places it in the epic tier. Another 15 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Multi-planet system, Its star is visible to the naked eye, Orbits a Sun-like star, Found before the year 2000 and Disputed — it may not be there at all — 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.