K-type star · orange dwarf
K2-21
4222 K
temperature
0.65 R☉
radius
0.68 M☉
mass
0.104 L☉
luminosity
How long to get there · 273 ly away
At light speed, about 273 years to reach this system.
See the full survival timeline (jet to folding spacetime) →Size vs the Sun
How it compares with our Sun
0.73×
as hot as the Sun
0.65×
the Sun's width
0.68×
the Sun's mass
0.10×
the Sun's light output
Worlds orbiting this star
- Explore →K2-21 bSub-Neptune · ESI 0.471.84 R⊕ · 9.3 days year
- Explore →K2-21 cSub-Neptune · ESI 0.592.49 R⊕ · 16 days year
Explore from here · roam the neighborhood
Zoom out: system → (soon) galaxy arm, and the host black hole at the galaxy's heart.
Can you see it tonight?
MID-SIZE TELESCOPE NEEDED
Brightness mag 12.9To see it 8-10" (200-250 mm) telescope
Illustration generated from K2-21's temperature, not a photograph.