What it’s like to stand here
K2-391 b
weight
≈ 1.30 g
sky
warm white

Illustration computed from this world’s measured and derived values, not a photograph.

Rocky world

K2-391 b

Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.

K2-391
host star
1.37 R⊕
radius
2.45 M⊕
mass · estimated from radius
4.6 days
orbital period
avg temp
What it's like to stand here
≈ 1.30 g
your weight (mass estimated from size)
4.6 days
one year, in Earth time
sun size, needs orbit
warm white
midday sky tint
0.8×
how high you could jump vs Earth
rotation unknown
How long to get there · 1,657 ly away
Jet airliner
2.0 billion years
dies en route1000-yr cryo: fails
Parker Solar Probethe fastest craft ever built
2.6 million years
dies en route1000-yr cryo: fails
Light speed
1,657 years
dies en route1000-yr cryo: fails
Warp 10
2 years
arrives, just older
Folding spacetime
instant
arrives thriving
Size vs Earth
EarthK2-391 b is 1.4× the width of Earth
Explore from here · roam the neighborhood
Host star
K2-391
G7 · 1 planet
Explore →
Sibling worlds in this system

No other confirmed planets here yet. New ones auto-appear as telescopes report.

Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.

Can you see it tonight? · observe
MID-SIZE TELESCOPE NEEDED
Host-star brightnessmag 12.5
ConstellationAquarius
To see the host star8-10" (200-250 mm) telescope
Gear bridge

Matched telescope & eyepiece recommendations are coming. Any product links will carry a clear affiliate disclosure.

Illustration generated from K2-391 b's confirmed parameters, not a photograph.