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Uncommon exoplanet 31 EP

WASP-69 b

RA 315.0260° · Dec -5.0949° · exoplanet

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Score breakdown

· 4 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Puffy low-density world +12
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10
  • Puffy low-density world · +12

Trivia

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 9.9 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 August — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.291
diameter km
142997.002
discovery facility
SuperWASP
discovery method
Transit
discovery year
2014
dist ly
162.9492
eccentricity
0
eq temp k
971
host star teff
4792
inclination
86.79
insolation
180.5564
mag
9.873
mass earth
82.58
name
WASP-69 b
orbital period days
3.8681
radius earth
11.21
semi major au
0.0453
spect
K
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About WASP-69 b

WASP-69 b is an uncommon exoplanet. It lies about 162.9 light-years from Earth, shines at apparent magnitude 9.87, has spectral type K and has an equilibrium temperature near 971 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 9.87, a small backyard telescope will bring it into view.

Like any astronomical target, WASP-69 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-69 b is an uncommon exoplanet

WASP-69 b scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Tidally locked and Puffy low-density world — 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.