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Trash exoplanet 9 EP

HD 155193 b

RA 257.4209° · Dec 10.0381° · 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

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.

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 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 June — 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. ≈ 3.3 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.477
diameter km
178586.8
discovery facility
Haute-Provence Observatory
discovery method
Radial Velocity
discovery year
2021
dist ly
188.5165
eccentricity
0.21
eq temp k
391.86
host star teff
6239
inclination
0.7112
insolation
4.0461
mag
7.0092
mass earth
238.3713
name
HD 155193 b
orbital period days
352.65
radius earth
14
semi major au
1.04
spect
F8 IV
sys num planets
1
sys num stars
1

About HD 155193 b

HD 155193 b is a trash exoplanet. It lies about 188.5 light-years from Earth, shines at apparent magnitude 7.01, has spectral type F8 IV and has an equilibrium temperature near 392 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 7.01, it is an easy target for binoculars.

Like any astronomical target, HD 155193 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 155193 b is a trash exoplanet

HD 155193 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.