About K2-170 c
K2-170 c is an uncommon exoplanet. It lies about 1,281.4 light-years from Earth, spans roughly 1.8 Earth radii, weighs about 3.9 Earth masses and completes an orbit every 12.4 days.
One of at least 2 planets orbiting its star.
Uncommon exoplanet 29 EP
K2-170 c
RA 335.4507° · Dec -14.5934° · exoplanet
Score breakdown
· 4 badgesUncommon 33 pts → Rare
- Distant (>1000 ly) +10
- Super-Earth +8
- Multi-planet system +6
- Confirmed exoplanet +5
Total score 29
4 more points to reach Rare.
Badges
- Confirmed exoplanet · +5
- Super-Earth · +8
- Multi-planet system · +6
- Distant (>1000 ly) · +10
Trivia
Could we get there?
- Verdict. Impossible with our current technology — and the next millennium of it.
Getting there
- Aboard Voyager 1. ≈ 22.5 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 2 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 12.8 thousand years in a starship at a tenth of light speed.
- Distance. 1281 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 745.
Saying hello
- Say hello. A radio message and its reply would take 2563 years round-trip.
Standing on it
- A year here. A full year lasts just 12.4 Earth days.
By the numbers
- Size. About 1.8× the width of Earth.
- Volume. About 5.8 Earths could fit inside it.
- Mass. About 3.9× the mass of Earth.
- Your weight. You'd weigh about 1.2× your Earth weight standing here.
How we found it
- Discovery. Found by K2 using the transit method.
Cosmic context
- Crowded system. One of at least 2 planets orbiting its star.
Properties
- density gcc
- 3.66
- discovery facility
- K2
- discovery method
- Transit
- dist ly
- 1281.3756
- mass earth
- 3.9
- name
- K2-170 c
- orbital period days
- 12.4
- radius earth
- 1.8018
- sys num planets
- 2
How to see it
Like any astronomical target, K2-170 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 K2-170 c is an uncommon exoplanet
K2-170 c scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, Multi-planet system and Distant (>1000 ly) — 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.