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Rare exoplanet 48 EP

HR 5183 b

RA 206.7358° · Dec 6.3499° · exoplanet

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Score breakdown

· 6 badges
48 pts · Rare
Rare 50 pts → Epic
  • Two suns in its sky +12
  • Long-period world +10
  • Eccentric orbit +9
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 48

2 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Long-period world · +10
  • Eccentric orbit · +9
  • Orbits a Sun-like star · +8
  • Two suns in its sky · +12

Trivia

What it actually is

  • What it is made of. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

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 6.3 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around April — 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. ≈ 1.8 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 160.2 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
2.57
diameter km
167106.22
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2019
dist ly
102.611
eccentricity
0.84
eq temp k
171
host star teff
5794
inclination
80.3
insolation
0.0077
mag
6.3343
mass earth
1052.012
multi star system
yes
name
HR 5183 b
orbital period days
27000
radius earth
13.1
semi major au
18
spect
G0 V
sys num planets
1
sys num stars
2

About HR 5183 b

HR 5183 b is a rare exoplanet. It lies about 102.6 light-years from Earth, shines at apparent magnitude 6.33, has spectral type G0 V and has an equilibrium temperature near 171 K.

Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

How to see it

At apparent magnitude 6.33, it is an easy target for binoculars.

Like any astronomical target, HR 5183 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 HR 5183 b is a rare exoplanet

HR 5183 b scores 48 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Long-period world, Eccentric orbit, Orbits a Sun-like star and Two suns in its sky — 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.