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Epic exoplanet 57 EP

WASP-77 A b

RA 37.1555° · Dec -7.0607° · exoplanet

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Score breakdown

· 7 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Two suns in its sky +12
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 57

21 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10
  • Blasted by starlight · +4
  • Orbits a Sun-like star · +8
  • 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.

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 10.3 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 October — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
1.33
diameter km
172974.072
discovery facility
SuperWASP
discovery method
Transit
discovery year
2012
dist ly
343.0052
eccentricity
0.0135
eq temp k
1674
host star teff
5617
inclination
89.99
insolation
1440
mag
10.294
mass earth
529.3114
multi star system
yes
name
WASP-77 A b
orbital period days
1.36
radius earth
13.56
semi major au
0.0232
spect
G8 V
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About WASP-77 A b

WASP-77 A b is an epic exoplanet. It lies about 343 light-years from Earth, shines at apparent magnitude 10.29, has spectral type G8 V and has an equilibrium temperature near 1,674 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 10.29, a small backyard telescope will bring it into view.

Like any astronomical target, WASP-77 A 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-77 A b is an epic exoplanet

WASP-77 A b scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Lava world, Tidally locked, Blasted by starlight, Orbits a Sun-like star 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.