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Rare exoplanet 41 EP

HD 183263 c

RA 292.1023° · Dec 8.3579° · exoplanet

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Score breakdown

· 6 badges
41 pts · Rare
Rare 50 pts → Epic
  • Long-period world +10
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 41

9 more points to reach Epic.

Badges

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

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 7.9 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Properties

density gcc
8.32
diameter km
159452.5
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2008
dist ly
176.7619
eccentricity
0.051
eq temp k
134.6
host star teff
5948
inclination
73.718
insolation
0.057
mag
7.86
mass earth
2958.9825
name
HD 183263 c
orbital period days
4667.9784
radius earth
12.5
semi major au
5.585
spect
G2 IV
sys num planets
2
sys num stars
1

Nearby objects

About HD 183263 c

HD 183263 c is a rare exoplanet. It lies about 176.8 light-years from Earth, shines at apparent magnitude 7.86, has spectral type G2 IV and has an equilibrium temperature near 135 K.

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

How to see it

At apparent magnitude 7.86, it is an easy target for binoculars.

Like any astronomical target, HD 183263 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 183263 c is a rare exoplanet

HD 183263 c scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world, Multi-planet system and Orbits a Sun-like star — 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.