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Common exoplanet 18 EP

HD 108147 b

RA 186.4410° · Dec -64.0223° · exoplanet

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Score breakdown

· 3 badges
18 pts · Common
Common 22 pts → Uncommon
  • Eccentric orbit +9
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 18

4 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Eccentric orbit · +9

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

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • 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.

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 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • 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
0.352
diameter km
139042.58
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2002
dist ly
126.9399
eccentricity
0.53
eq temp k
890
host star teff
6255.73
insolation
193.0925
mag
6.99
mass earth
82.95
name
HD 108147 b
orbital period days
10.8985
radius earth
10.9
semi major au
0.102
spect
F8 V CH+0.4
sys num planets
1
sys num stars
1

Nearby objects

About HD 108147 b

HD 108147 b is a common exoplanet. It lies about 126.9 light-years from Earth, shines at apparent magnitude 6.99, has spectral type F8 V CH+0.4 and has an equilibrium temperature near 890 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 6.99, it is an easy target for binoculars.

Like any astronomical target, HD 108147 b 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 108147 b is a common exoplanet

HD 108147 b scores 18 points on Spacedle's rarity scale, which places it in the common tier. Another 4 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Eccentric orbit — 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.