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Epic exoplanet 55 EP

HD 87816 c

RA 151.5297° · Dec -52.1879° · exoplanet

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Score breakdown

· 5 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Long-period world +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 55

23 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Long-period world · +10
  • 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.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • 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. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.

Properties

density gcc
11.2
diameter km
158176.88
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2025
dist ly
434.5474
eccentricity
0.19
eq temp k
226.65
habitable zone
yes
host star teff
4989
insolation
0.4396
mag
6.5
mass earth
3877.5066
name
HD 87816 c
orbital period days
7596
radius earth
12.4
semi major au
10.14
spect
K0 III
sys num planets
2
sys num stars
1

About HD 87816 c

HD 87816 c is an epic exoplanet. It lies about 434.5 light-years from Earth, shines at apparent magnitude 6.5, has spectral type K0 III and has an equilibrium temperature near 227 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 6.5, it is an easy target for binoculars.

Like any astronomical target, HD 87816 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 87816 c is an epic exoplanet

HD 87816 c scores 55 points on Spacedle's rarity scale, which places it in the epic tier. Another 23 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Long-period world 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.