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Epic exoplanet 65 EP

55 Cnc d

RA 133.1468° · Dec 28.3298° · exoplanet

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Score breakdown

· 7 badges
65 pts · Epic
Epic 78 pts → Anomaly
  • Richly packed system +14
  • Its star is visible to the naked eye +12
  • Two suns in its sky +12
  • Long-period world +10
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 65

13 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Richly packed system · +14
  • Its star is visible to the naked eye · +12
  • Two suns in its sky · +12

Trivia

What makes it special

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

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • Crowded system. One of at least 7 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 6 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 February — that's when to go looking.

Could we get there?

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

Properties

density gcc
3.08
diameter km
165830.6
discovery facility
Lick Observatory
discovery method
Radial Velocity
discovery year
2002
dist ly
41.0484
eccentricity
0.0913
eq temp k
104.85
host star teff
5198
inclination
89.73
insolation
0.0203
mag
5.9508
mass earth
1232.493
multi star system
yes
name
55 Cnc d
orbital period days
4799
radius earth
13
semi major au
5.6
spect
G8 V
sys num planets
7
sys num stars
2

About 55 Cnc d

55 Cnc d is an epic exoplanet. It lies about 41 light-years from Earth, shines at apparent magnitude 5.95, has spectral type G8 V and has an equilibrium temperature near 105 K.

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

How to see it

At apparent magnitude 5.95, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 55 Cnc d 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 55 Cnc d is an epic exoplanet

55 Cnc d scores 65 points on Spacedle's rarity scale, which places it in the epic tier. Another 13 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world, Richly packed system, Its star is visible to the naked eye and Two suns in its sky — 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.