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Uncommon exoplanet 31 EP

HD 10180 f

RA 24.4731° · Dec -60.5115° · exoplanet

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Score breakdown

· 4 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Richly packed system +14
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Neptune-like +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Richly packed system · +14
  • 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 6 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 7.3 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 October — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.913
diameter km
66842.488
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2010
dist ly
127.0727
eccentricity
0.119
eq temp k
427.54
host star teff
5911
inclination
90
insolation
6.1329
mag
7.33
mass earth
23.9
name
HD 10180 f
orbital period days
122.744
radius earth
5.24
semi major au
0.4929
spect
G1 V
sys num planets
6
sys num stars
1

About HD 10180 f

HD 10180 f is an uncommon exoplanet. It lies about 127.1 light-years from Earth, shines at apparent magnitude 7.33, has spectral type G1 V and has an equilibrium temperature near 428 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 7.33, it is an easy target for binoculars.

Like any astronomical target, HD 10180 f 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 10180 f is an uncommon exoplanet

HD 10180 f scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Neptune-like, Richly packed 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.