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Uncommon exoplanet 23 EP

HD 108874 c

RA 187.6126° · Dec 22.8794° · 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

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

What it actually is

  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • 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 8.8 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around March — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.658
diameter km
176035.56
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2005
dist ly
194.1199
eccentricity
0.239
eq temp k
168.21
host star teff
5551
insolation
0.1412
mag
8.76
mass earth
314.64
name
HD 108874 c
orbital period days
1624
radius earth
13.8
semi major au
2.659
spect
G5
sys num planets
2
sys num stars
1

Nearby objects

About HD 108874 c

HD 108874 c is an uncommon exoplanet. It lies about 194.1 light-years from Earth, shines at apparent magnitude 8.76, has spectral type G5 and has an equilibrium temperature near 168 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 8.76, it is an easy target for binoculars.

Like any astronomical target, HD 108874 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 108874 c is an uncommon exoplanet

HD 108874 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.