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Uncommon exoplanet 27 EP

7 CMa c

RA 99.1713° · Dec -19.2562° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Its star is visible to the naked eye +12
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Multi-planet system · +6
  • Its star is visible to the naked eye · +12

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

  • 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 2 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 4 you can see it with your own eyes from a dark site.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around December — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.566
diameter km
177311.18
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2019
dist ly
64.6118
eccentricity
0.08
eq temp k
350
host star teff
4826
inclination
90
insolation
2.4917
mag
3.95
mass earth
276.5121
name
7 CMa c
orbital period days
996
radius earth
13.9
semi major au
2.153
spect
K1III(+M)
sys num planets
2
sys num stars
1

About 7 CMa c

7 CMa c is an uncommon exoplanet. It lies about 64.6 light-years from Earth, shines at apparent magnitude 3.95, has spectral type K1III(+M) and has an equilibrium temperature near 350 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 3.95, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 7 CMa c 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 7 CMa c is an uncommon exoplanet

7 CMa c scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Multi-planet system 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.