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Uncommon exoplanet 29 EP

K2-99 c

RA 208.7738° · Dec -5.4425° · exoplanet

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Score breakdown

· 5 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Orbits a Sun-like star +8
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

Trivia

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • 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 11.1 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 April — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 29.8 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
7.33
diameter km
160728.12
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2022
dist ly
1693.4965
eccentricity
0.21
eq temp k
390
host star teff
6069
insolation
3.8779
mag
11.149
mass earth
2669.7586
name
K2-99 c
orbital period days
522.2
radius earth
12.6
semi major au
1.43
spect
G0 IV
sys num planets
2
sys num stars
1

About K2-99 c

K2-99 c is an uncommon exoplanet. It lies about 1,693.5 light-years from Earth, shines at apparent magnitude 11.15, has spectral type G0 IV and has an equilibrium temperature near 390 K.

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

How to see it

At apparent magnitude 11.15, a small backyard telescope will bring it into view.

Like any astronomical target, K2-99 c 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 K2-99 c is an uncommon exoplanet

K2-99 c scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Multi-planet system 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.