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Epic exoplanet 61 EP

HD 38529 b

RA 86.6451° · Dec 1.1676° · exoplanet

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Score breakdown

· 7 badges
61 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Its star is visible to the naked eye +12
  • Two suns in its sky +12
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 61

17 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Multi-planet system · +6
  • Its star is visible to the naked eye · +12
  • 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.

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.
  • Crowded system. One of at least 2 planets orbiting its star.

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 5.9 you can see it with your own eyes from a dark site.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.

Properties

density gcc
0.405
diameter km
179862.42
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2000
dist ly
138.1395
eccentricity
0.256
eq temp k
1369.46
host star teff
5697
insolation
516.1847
mag
5.9285
mass earth
206.5885
multi star system
yes
name
HD 38529 b
orbital period days
14.3099
radius earth
14.1
semi major au
0.115
spect
G4 IV
sys num planets
2
sys num stars
2

About HD 38529 b

HD 38529 b is an epic exoplanet. It lies about 138.1 light-years from Earth, shines at apparent magnitude 5.93, has spectral type G4 IV and has an equilibrium temperature near 1,369 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 5.93, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 38529 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 38529 b is an epic exoplanet

HD 38529 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, Multi-planet system, Its star is visible to the naked eye, 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.