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Uncommon exoplanet 23 EP

HD 82943 c

RA 143.7114° · Dec -12.1303° · 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

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. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around February — 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. ≈ 1.6 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
1.42
diameter km
170933.08
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2003
dist ly
89.9871
eccentricity
0.3663
eq temp k
360.95
host star teff
5935
inclination
90
insolation
2.8285
mag
6.5499
mass earth
622.603
name
HD 82943 c
orbital period days
220.078
radius earth
13.4
semi major au
0.7435
spect
G2/3V
sys num planets
2
sys num stars
1

About HD 82943 c

HD 82943 c is an uncommon exoplanet. It lies about 90 light-years from Earth, shines at apparent magnitude 6.55, has spectral type G2/3V and has an equilibrium temperature near 361 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 6.55, it is an easy target for binoculars.

Like any astronomical target, HD 82943 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 82943 c is an uncommon exoplanet

HD 82943 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.