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Uncommon exoplanet 33 EP

HIP 5158 c

RA 16.5095° · Dec -22.4536° · exoplanet

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Score breakdown

· 5 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Long-period world +10
  • Frozen world +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Multi-planet system · +6

Trivia

What makes it special

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

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.
  • 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 10.2 you'll want a small backyard telescope.
  • 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 October — that's when to go looking.

Properties

density gcc
14.5
diameter km
155625.64
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2011
dist ly
168.305
eccentricity
0.14
eq temp k
72.63
host star teff
4813
insolation
0.0046
mag
10.16
mass earth
4780.1632
name
HIP 5158 c
orbital period days
9017.76
radius earth
12.2
semi major au
7.7
sys num planets
2
sys num stars
1

About HIP 5158 c

HIP 5158 c is an uncommon exoplanet. It lies about 168.3 light-years from Earth, shines at apparent magnitude 10.16, has an equilibrium temperature near 73 K and spans roughly 12.2 Earth radii.

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

How to see it

At apparent magnitude 10.16, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 5158 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 HIP 5158 c is an uncommon exoplanet

HIP 5158 c scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, 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.