About K2-198 b
K2-198 b is a common exoplanet. It lies about 360.6 light-years from Earth, has an equilibrium temperature near 716 K, spans roughly 4.19 Earth radii and weighs about 16.3 Earth masses.
One of at least 3 planets orbiting its star.
Common exoplanet 15 EP
K2-198 b
RA 198.8437° · Dec -6.4650° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Multi-planet system +6
- Confirmed exoplanet +5
- Neptune-like +4
Total score 15
9 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Neptune-like · +4
- Multi-planet system · +6
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 6.3 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 563.1 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 3606 years in a starship at a tenth of light speed.
- Distance. 361 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1665.
Saying hello
- Say hello. A radio message and its reply would take 721 years round-trip.
Standing on it
- A year here. A full year lasts just 17 Earth days.
By the numbers
- Size. About 4.2× the width of Earth.
- Volume. About 73.5 Earths could fit inside it.
- Mass. About 16.3× the mass of Earth.
- Your weight. You'd weigh about 0.9× your Earth weight standing here.
- Temperature. Around 443°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by K2 using the transit method.
Cosmic context
- Crowded system. One of at least 3 planets orbiting its star.
Properties
- density gcc
- 1.22
- discovery facility
- K2
- discovery method
- Transit
- dist ly
- 360.6209
- eq temp k
- 715.8
- mass earth
- 16.3
- name
- K2-198 b
- orbital period days
- 17.0429
- radius earth
- 4.189
- sys num planets
- 3
How to see it
Like any astronomical target, K2-198 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 K2-198 b is a common exoplanet
K2-198 b scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 9 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Neptune-like 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.