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Trash exoplanet 9 EP

HD 111591 b

RA 192.5725° · Dec 22.8631° · exoplanet

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Score breakdown

· 2 badges
9 pts · Trash
Trash 15 pts → Common
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 9

6 more points to reach Common.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4

Trivia

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

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 6.4 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • 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. ≈ 6.5 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 581.4 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
3.58
diameter km
164554.98
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2017
dist ly
372.3593
eccentricity
0.26
eq temp k
422.08
host star teff
4884
insolation
6.0912
mag
6.417
mass earth
1398.452
name
HD 111591 b
orbital period days
1056.4
radius earth
12.9
semi major au
2.5
spect
K0 III
sys num planets
1
sys num stars
1

About HD 111591 b

HD 111591 b is a trash exoplanet. It lies about 372.4 light-years from Earth, shines at apparent magnitude 6.42, has spectral type K0 III and has an equilibrium temperature near 422 K.

Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

How to see it

At apparent magnitude 6.42, it is an easy target for binoculars.

Like any astronomical target, HD 111591 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 111591 b is a trash exoplanet

HD 111591 b scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.

That score comes from 2 science badges — Confirmed exoplanet and Gas giant — 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.