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Uncommon exoplanet 31 EP

K2-88 b

RA 54.7515° · Dec 19.1200° · exoplanet

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Score breakdown

· 3 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Earth-sized +16
  • Tidally locked +10
  • Confirmed exoplanet +5
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Tidally locked · +10

Trivia

What makes it special

  • Earth-sized. Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

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. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 15.5 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around November — that's when to go looking.

Could we get there?

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

Properties

density gcc
6.02
diameter km
15690.126
discovery facility
K2
discovery method
Transit
discovery year
2016
dist ly
360.6013
eccentricity
0.26
eq temp k
464.6
host star teff
3537
inclination
87.75
insolation
7.8
mag
15.523
mass earth
2.04
name
K2-88 b
orbital period days
4.6122
radius earth
1.23
semi major au
0.0345
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-88 b

K2-88 b is an uncommon exoplanet. It lies about 360.6 light-years from Earth, shines at apparent magnitude 15.52, has an equilibrium temperature near 465 K and spans roughly 1.23 Earth radii.

Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

How to see it

At apparent magnitude 15.52, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, K2-88 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 K2-88 b is an uncommon exoplanet

K2-88 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 3 science badges — Confirmed exoplanet, Earth-sized and Tidally locked — 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.