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Trash exoplanet 10 EP

HD 238090 b

RA 183.0886° · Dec 54.4862° · exoplanet

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Score breakdown

· 2 badges
10 pts · Trash
Trash 15 pts → Common
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 10

5 more points to reach Common.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5

Trivia

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • 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. 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 9.7 you'll want a small backyard telescope.
  • 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 March — 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. ≈ 873.2 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
2.37
diameter km
32145.624
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2020
dist ly
49.6912
eccentricity
0.3
eq temp k
469.6
host star teff
3933
insolation
8.1
mag
9.71
mass earth
6.89
name
HD 238090 b
orbital period days
13.671
radius earth
2.52
semi major au
0.0932
spect
M0.0 V
sys num planets
1
sys num stars
1

Nearby objects

About HD 238090 b

HD 238090 b is a trash exoplanet. It lies about 49.7 light-years from Earth, shines at apparent magnitude 9.71, has spectral type M0.0 V and has an equilibrium temperature near 470 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 9.71, a small backyard telescope will bring it into view.

Like any astronomical target, HD 238090 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 238090 b is a trash exoplanet

HD 238090 b scores 10 points on Spacedle's rarity scale, which places it in the trash tier. Another 5 points would lift it into a rarer tier.

That score comes from 2 science badges — Confirmed exoplanet and Sub-Neptune — 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.