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Trash exoplanet 9 EP

HD 136418 b

RA 229.7756° · Dec 41.7324° · 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. 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 7.8 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 May — 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 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 535.6 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
1.59
diameter km
169657.46
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
343.0117
eccentricity
0.25
eq temp k
411.81
host star teff
4989
insolation
4.0863
mag
7.849
mass earth
680.1562
name
HD 136418 b
orbital period days
464.3
radius earth
13.3
semi major au
1.29
spect
G5
sys num planets
1
sys num stars
1

About HD 136418 b

HD 136418 b is a trash exoplanet. It lies about 343 light-years from Earth, shines at apparent magnitude 7.85, has spectral type G5 and has an equilibrium temperature near 412 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 7.85, it is an easy target for binoculars.

Like any astronomical target, HD 136418 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 136418 b is a trash exoplanet

HD 136418 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.