What it’s like to stand here
HD 187123 c
weight
5.24 g
sun
0.24× as wide
sky
warm white

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

Gas giant

HD 187123 c

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

HD 187123
host star
13.20 R⊕
radius
912 M⊕
mass · measured
10.4 years
orbital period
-138°C (-216°F)
avg temp
What it's like to stand here
5.24 g
surface gravity (no solid surface · measured mass)
10.4 years
one year, in Earth time
0.24× as wide
how big its sun looks vs ours
warm white
midday sky tint
0.2×
how high you could jump vs Earth
normal
day/night cycle (not tidally locked)
How long to get there · 150 ly away
Jet airliner
180 million years
dies en route1000-yr cryo: fails
Parker Solar Probethe fastest craft ever built
233,761 years
dies en route1000-yr cryo: fails
Light speed
150 years
dies en route1000-yr cryo: survives
Warp 10
55 days
arrives thriving
Folding spacetime
instant
arrives thriving
Size vs Earth
EarthHD 187123 c is 13× the width of Earth
Explore from here · roam the neighborhood
Host star
HD 187123
G3 V · 2 planets
Explore →
Sibling worlds in this system

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

Can you see it tonight? · observe
BINOCULARS NEEDED
Host-star brightnessmag 7.8
ConstellationCygnus
To see the host star50 mm binoculars
Gear bridge

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

Illustration generated from HD 187123 c's confirmed parameters, not a photograph.