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Uncommon exoplanet 33 EP

K2-396 b

RA 74.6929° · Dec 17.2691° · exoplanet

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Score breakdown

· 4 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Ultra-short period +14
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Ultra-short period · +14
  • Multi-planet system · +6

Trivia

Hard to believe

  • A year in a day. Its entire year is over in 16.2 hours. Birthdays here would come round faster than meals.

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • 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 13.3 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 December — that's when to go looking.

Properties

density gcc
4.35
diameter km
20142.0398
discovery facility
K2
discovery method
Transit
discovery year
2022
dist ly
896.4854
host star teff
5236
mag
13.32
mass earth
3.12
name
K2-396 b
orbital period days
0.6739
radius earth
1.579
spect
G9
sys num planets
2
sys num stars
1

About K2-396 b

K2-396 b is an uncommon exoplanet. It lies about 896.5 light-years from Earth, shines at apparent magnitude 13.32, has spectral type G9 and spans roughly 1.58 Earth radii.

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 13.32, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, K2-396 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 K2-396 b is an uncommon exoplanet

K2-396 b scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, Ultra-short period and Multi-planet system — 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.