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Rare exoplanet 46 EP

HD 216520 c

RA 341.8769° · Dec 83.6975° · exoplanet

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Score breakdown

· 4 badges
46 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 46

4 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Sub-Neptune · +5
  • Multi-planet system · +6

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

What it actually is

  • What it is made of. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.
  • 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 7.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Properties

density gcc
1.86
diameter km
38651.286
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2020
dist ly
63.77
eccentricity
0.12
eq temp k
295.22
habitable zone
yes
host star teff
5103
insolation
1.2669
mag
7.53
mass earth
9.44
name
HD 216520 c
orbital period days
154.43
radius earth
3.03
semi major au
0.528
spect
K2
sys num planets
2
sys num stars
1

Nearby objects

About HD 216520 c

HD 216520 c is a rare exoplanet. It lies about 63.8 light-years from Earth, shines at apparent magnitude 7.53, has spectral type K2 and has an equilibrium temperature near 295 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 7.53, it is an easy target for binoculars.

Like any astronomical target, HD 216520 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 HD 216520 c is a rare exoplanet

HD 216520 c scores 46 points on Spacedle's rarity scale, which places it in the rare tier. Another 4 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Sub-Neptune and Multi-planet system — 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.