About K2-387 b
K2-387 b is a trash exoplanet. It lies about 868.6 light-years from Earth, spans roughly 7.32 Earth radii, weighs about 42.2 Earth masses and completes an orbit every 28.74 days.
About 7.3× the width of Earth.
Trash exoplanet 9 EP
K2-387 b
RA 19.4418° · Dec 11.3685° · exoplanet
Score breakdown
· 2 badgesTrash 15 pts → Common
- Confirmed exoplanet +5
- Gas giant +4
Total score 9
6 more points to reach Common.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 15.3 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 1.4 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 8686 years in a starship at a tenth of light speed.
- Distance. 869 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1157.
Saying hello
- Say hello. A radio message and its reply would take 1737 years round-trip.
Standing on it
- A year here. A full year lasts just 28.7 Earth days.
By the numbers
- Size. About 7.3× the width of Earth.
- Volume. About 393 Earths could fit inside it.
- Mass. About 42.2× the mass of Earth.
- Your weight. You'd weigh about 0.8× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
How we found it
- Discovery. Found by K2 using the transit method.
Properties
- density gcc
- 0.591
- discovery facility
- K2
- discovery method
- Transit
- dist ly
- 868.6121
- mass earth
- 42.2
- name
- K2-387 b
- orbital period days
- 28.7353
- radius earth
- 7.322
- sys num planets
- 1
How to see it
Like any astronomical target, K2-387 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 K2-387 b is a trash exoplanet
K2-387 b scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.
That score comes from 2 science badges — Confirmed exoplanet and Gas giant — 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.