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Rare exoplanet 45 EP

K2-19 d

RA 174.9603° · Dec 0.6036° · exoplanet

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Score breakdown

· 5 badges
45 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Tidally locked · +10
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

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.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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.
  • Crowded system. One of at least 3 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 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.

Properties

density gcc
31
diameter km
13317.4728
discovery facility
K2
discovery method
Transit
discovery year
2016
dist ly
945.2882
eccentricity
0.44
eq temp k
1258
host star teff
5350
inclination
89.7
insolation
404
mag
13.024
mass earth
6.2
name
K2-19 d
orbital period days
2.5083
radius earth
1.044
semi major au
0.0348
spect
G9
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-19 d

K2-19 d is a rare exoplanet. It lies about 945.3 light-years from Earth, shines at apparent magnitude 13.02, has spectral type G9 and has an equilibrium temperature near 1,258 K.

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

Like any astronomical target, K2-19 d 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 K2-19 d is a rare exoplanet

K2-19 d scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Earth-sized, Tidally locked, 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.