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Epic exoplanet 57 EP

HD 142 c

RA 1.5837° · Dec -49.0754° · exoplanet

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Score breakdown

· 7 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Its star is visible to the naked eye +12
  • Two suns in its sky +12
  • Long-period world +10
  • Frozen world +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 57

21 more points to reach Anomaly.

Badges

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

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 3 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 5.7 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 September — that's when to go looking.

Properties

density gcc
9.99
diameter km
158176.88
discovery facility
Anglo-Australian Telescope
discovery method
Radial Velocity
discovery year
2012
dist ly
85.4049
eccentricity
0.277
eq temp k
116.56
host star teff
6245
inclination
90.374
insolation
0.031
mag
5.7
mass earth
3464.6475
multi star system
yes
name
HD 142 c
orbital period days
10159.6428
radius earth
12.4
semi major au
9.811
spect
F7V
sys num planets
3
sys num stars
2

About HD 142 c

HD 142 c is an epic exoplanet. It lies about 85.4 light-years from Earth, shines at apparent magnitude 5.7, has spectral type F7V and has an equilibrium temperature near 117 K.

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

How to see it

At apparent magnitude 5.7, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 142 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 142 c is an epic exoplanet

HD 142 c scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world, Multi-planet 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.