About K2-210 b
K2-210 b is a rare exoplanet. It lies about 575.7 light-years from Earth, spans roughly 0.86 Earth radii, weighs about 0.57 Earth masses and completes an orbit every 0.57 days.
Around 86% of Earth's width.
Rare exoplanet 35 EP
K2-210 b
RA 17.6413° · Dec 1.5784° · exoplanet
Score breakdown
· 3 badgesRare 46 pts → Epic
- Earth-sized +16
- Ultra-short period +14
- Confirmed exoplanet +5
Total score 35
11 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Earth-sized · +16
- Ultra-short period · +14
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 10.1 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 898.9 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 5757 years in a starship at a tenth of light speed.
- Distance. 576 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1450.
Saying hello
- Say hello. A radio message and its reply would take 1151 years round-trip.
Standing on it
- A year here. A full year lasts just 0.6 Earth days.
By the numbers
- Size. Around 86% of Earth's width.
- Mass. About 0.6× the mass of Earth.
- Your weight. You'd weigh about 0.8× your Earth weight standing here.
How we found it
- Discovery. Found by K2 using the transit method.
Properties
- density gcc
- 4.89
- discovery facility
- K2
- discovery method
- Transit
- dist ly
- 575.698
- mass earth
- 0.566
- name
- K2-210 b
- orbital period days
- 0.5702
- radius earth
- 0.86
- sys num planets
- 1
How to see it
Like any astronomical target, K2-210 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 K2-210 b is a rare exoplanet
K2-210 b scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Earth-sized and Ultra-short period — 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.