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Uncommon exoplanet 33 EP

WASP-7 b

RA 311.0428° · Dec -39.2255° · exoplanet

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Score breakdown

· 4 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Lava world +14
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10

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 9.5 you'll want a small backyard telescope.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around August — that's when to go looking.

Properties

density gcc
0.55
diameter km
190169.0469
discovery facility
SuperWASP
discovery method
Transit
discovery year
2008
dist ly
529.361
eccentricity
0.034
eq temp k
1487
host star teff
6400
inclination
87.03
insolation
612.686
mag
9.504
mass earth
305.1168
name
WASP-7 b
orbital period days
4.9546
radius earth
14.908
semi major au
0.0617
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About WASP-7 b

WASP-7 b is an uncommon exoplanet. It lies about 529.4 light-years from Earth, shines at apparent magnitude 9.5, has an equilibrium temperature near 1,487 K and spans roughly 14.91 Earth radii.

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

How to see it

At apparent magnitude 9.5, a small backyard telescope will bring it into view.

Like any astronomical target, WASP-7 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-7 b is an uncommon exoplanet

WASP-7 b scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Lava world and Tidally locked — 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.