← Back to dex
Epic exoplanet 51 EP

XO-2 N b

RA 117.0268° · Dec 50.2251° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 6 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Two suns in its sky +12
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 51

27 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10
  • Multi-planet system · +6
  • 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 4 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 11.2 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.

Properties

density gcc
0.715
diameter km
141983.3561
discovery facility
XO
discovery method
Transit
discovery year
2007
dist ly
503.1706
eccentricity
0
eq temp k
1328
host star teff
5290
inclination
88.01
insolation
428.036
mag
11.246
mass earth
199.9151
multi star system
yes
name
XO-2 N b
orbital period days
2.6159
radius earth
11.1305
semi major au
0.0367
spect
G8 V
sys num planets
4
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About XO-2 N b

XO-2 N b is an epic exoplanet. It lies about 503.2 light-years from Earth, shines at apparent magnitude 11.25, has spectral type G8 V and has an equilibrium temperature near 1,328 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 11.25, a small backyard telescope will bring it into view.

Like any astronomical target, XO-2 N 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 XO-2 N b is an epic exoplanet

XO-2 N b scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Lava world, Tidally locked, Multi-planet system 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.