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Uncommon exoplanet 23 EP

HD 168443 c

RA 275.0160° · Dec -9.5967° · exoplanet

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Score breakdown

· 4 badges
23 pts · Uncommon
Uncommon 34 pts → Rare
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 23

11 more points to reach Rare.

Badges

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

Trivia

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 6.9 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 June — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
16.6
diameter km
155625.64
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2000
dist ly
129.2377
eccentricity
0.21
eq temp k
205.47
host star teff
5491
inclination
91.218
insolation
0.2987
mag
6.9212
mass earth
5500.3384
name
HD 168443 c
orbital period days
1753.1096
radius earth
12.2
semi major au
2.842
spect
G5
sys num planets
2
sys num stars
1

About HD 168443 c

HD 168443 c is an uncommon exoplanet. It lies about 129.2 light-years from Earth, shines at apparent magnitude 6.92, has spectral type G5 and has an equilibrium temperature near 205 K.

Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

How to see it

At apparent magnitude 6.92, it is an easy target for binoculars.

Like any astronomical target, HD 168443 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 168443 c is an uncommon exoplanet

HD 168443 c scores 23 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 11 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, 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.