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Epic exoplanet 61 EP

WASP-54 b

RA 205.4542° · Dec -0.1282° · exoplanet

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Score breakdown

· 7 badges
61 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Puffy low-density world +12
  • Two suns in its sky +12
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 61

17 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Blasted by starlight · +4
  • Two suns in its sky · +12

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

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

  • 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. 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 10.4 you'll want a small backyard telescope.
  • 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 April — that's when to go looking.

Properties

density gcc
0.167
diameter km
225915.1084
discovery facility
SuperWASP
discovery method
Transit
discovery year
2012
dist ly
819.6398
eccentricity
0.07
eq temp k
1759
host star teff
6100
inclination
84.97
insolation
1639.1072
mag
10.413
mass earth
187.5197
multi star system
yes
name
WASP-54 b
orbital period days
3.6936
radius earth
17.7102
semi major au
0.0499
spect
F9
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About WASP-54 b

WASP-54 b is an epic exoplanet. It lies about 819.6 light-years from Earth, shines at apparent magnitude 10.41, has spectral type F9 and has an equilibrium temperature near 1,759 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 10.41, a small backyard telescope will bring it into view.

Like any astronomical target, WASP-54 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 WASP-54 b is an epic exoplanet

WASP-54 b scores 61 points on Spacedle's rarity scale, which places it in the epic tier. Another 17 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Lava world, Tidally locked, Puffy low-density world, Blasted by starlight and Two suns in its sky — 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.