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Uncommon exoplanet 28 EP

KOI-984 b

RA 291.0489° · Dec 36.8401° · exoplanet

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Score breakdown

· 5 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by Kepler +3
Total score 28

6 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Tidally locked · +10
  • Multi-planet system · +6
  • Found by Kepler · +3

Trivia

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 12.8 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 July — that's when to go looking.

Could we get there?

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

Properties

density gcc
1.18
diameter km
54851.66
discovery facility
Kepler
discovery method
Transit
discovery year
2022
dist ly
824.0886
eccentricity
0.12
eq temp k
1022
host star teff
5295
inclination
88.93
insolation
186.31
mag
12.795
mass earth
17.1
name
KOI-984 b
orbital period days
4.2882
radius earth
4.3
semi major au
0.0504
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About KOI-984 b

KOI-984 b is an uncommon exoplanet. It lies about 824.1 light-years from Earth, shines at apparent magnitude 12.79, has an equilibrium temperature near 1,022 K and spans roughly 4.3 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 12.79, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, KOI-984 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 KOI-984 b is an uncommon exoplanet

KOI-984 b scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Neptune-like, Tidally locked, Multi-planet system and Found by Kepler — 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.