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Rare exoplanet 37 EP

HD 10180 c

RA 24.4731° · Dec -60.5115° · exoplanet

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Score breakdown

· 4 badges
37 pts · Rare
Rare 50 pts → Epic
  • Richly packed system +14
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
Total score 37

13 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Tidally locked · +10
  • Richly packed system · +14
  • Orbits a Sun-like star · +8

Trivia

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.
  • 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.

Getting there

  • Aboard Voyager 1. ≈ 2.2 million years at Voyager 1's speed (17 km/s).

Properties

discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2010
dist ly
127.0727
eccentricity
0.073
eq temp k
1185.4
host star teff
5911
inclination
90
insolation
362.4092
mag
7.33
mass earth
2741.5878
name
HD 10180 c
orbital period days
5.7597
semi major au
0.0641
spect
G1 V
sys num planets
6
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 10180 c

HD 10180 c is a rare 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 1,185 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 7.33, it is an easy target for binoculars.

Like any astronomical target, HD 10180 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 10180 c is a rare exoplanet

HD 10180 c scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Tidally locked, 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.