← Back to dex
Uncommon exoplanet 27 EP

K2-261 b

RA 163.0323° · Dec 0.4932° · exoplanet

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

Computing the sky for your location…

Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Hot Jupiter +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Hot Jupiter · +10
  • Orbits a Sun-like star · +8

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 10.6 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 March — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.473
diameter km
118247.7677
discovery facility
K2
discovery method
Transit
discovery year
2018
dist ly
695.6353
eccentricity
0.274
eq temp k
1036
host star teff
5490
inclination
88.58
insolation
180
mag
10.612
mass earth
68.9688
name
K2-261 b
orbital period days
11.6335
radius earth
9.2698
semi major au
0.1086
spect
G7 IV/V
sys num planets
1
sys num stars
1

About K2-261 b

K2-261 b is an uncommon exoplanet. It lies about 695.6 light-years from Earth, shines at apparent magnitude 10.61, has spectral type G7 IV/V and has an equilibrium temperature near 1,036 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 10.61, a small backyard telescope will bring it into view.

Like any astronomical target, K2-261 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 K2-261 b is an uncommon exoplanet

K2-261 b scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter and Orbits a Sun-like star — 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.