← Back to dex
Trash exoplanet 9 EP

HD 175541 b

RA 283.9203° · Dec 4.2649° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

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 8 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 July — 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. ≈ 7.4 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.373
diameter km
179862.42
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2007
dist ly
422.708
eccentricity
0.11
eq temp k
501.11
host star teff
5013
insolation
9.0363
mag
8.02
mass earth
190.0623
name
HD 175541 b
orbital period days
298.43
radius earth
14.1
semi major au
0.975
spect
G8 IV
sys num planets
1
sys num stars
1

Nearby objects

About HD 175541 b

HD 175541 b is a trash exoplanet. It lies about 422.7 light-years from Earth, shines at apparent magnitude 8.02, has spectral type G8 IV and has an equilibrium temperature near 501 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 8.02, it is an easy target for binoculars.

Like any astronomical target, HD 175541 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 175541 b is a trash exoplanet

HD 175541 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.