What it’s like to stand here

GJ 581 c

weight: 1.09 g
sun: 4.2× wider
sky: deep orange

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

Sub-Neptune

GJ 581 c

ESI 0.61 20.5 ly Discovered in 2007 by La Silla Observatory

Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.

GJ 581 →

host star

2.50 R⊕

radius

6.81 M⊕

mass · measured

13 days

orbital period

73°C (163°F)

avg temp

What it's like to stand here

1.09 g

your weight (measured mass)

13 days

one year, in Earth time

4.2× wider

how big its sun looks vs ours

deep orange

midday sky tint

0.9×

how high you could jump vs Earth

likely

likely tidally locked: probably eternal day on one side, night on the other

How long to get there · 20.5 ly away

Jet airliner

24.6 million years

dies en route1000-yr cryo: fails

Parker Solar Probethe fastest craft ever built

32,037 years

dies en route1000-yr cryo: fails

Light speed

21 years

arrives elderly

Warp 10

7 days

arrives thriving

Folding spacetime

instant

arrives thriving

Size vs Earth

Explore from here · roam the neighborhood

GJ 581 cSub-Neptune

PlanetGJ 581 eRocky world

PlanetGJ 581 bIce / gas giant

PlanetTOI-700 csimilar world

SystemHN Lib4.3 ly

Sky regionLibrathis direction

Sibling worlds in this system

Nearby star systems

Similar worlds (size · gravity · star)

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

Can you see it tonight? · observe

SMALL TELESCOPE NEEDED

Host-star brightnessmag 10.6

ConstellationLibra →

To see the host star4-6" (100-150 mm) telescope

Gear bridge

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

Illustration generated from GJ 581 c's confirmed parameters, not a photograph.