About XO-2 S b
XO-2 S b is a common exoplanet. It lies about 493.8 light-years from Earth, has an equilibrium temperature near 707 K, spans roughly 10.9 Earth radii and weighs about 82.64 Earth masses.
One of at least 4 planets orbiting its star.
Common exoplanet 15 EP
XO-2 S b
RA 117.0310° · Dec 50.2169° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Multi-planet system +6
- Confirmed exoplanet +5
- Gas giant +4
Total score 15
9 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Multi-planet system · +6
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 8.7 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 771 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 4938 years in a starship at a tenth of light speed.
- Distance. 494 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1532.
Saying hello
- Say hello. A radio message and its reply would take 988 years round-trip.
Standing on it
- A year here. A full year lasts just 18.2 Earth days.
By the numbers
- Size. About 10.9× the width of Earth.
- Volume. About 1295 Earths could fit inside it.
- Mass. Roughly 82.6× Earth's mass — about 0.3 Jupiters.
- Your weight. You'd weigh about 0.7× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. Around 433°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Roque de los Muchachos Observatory using the radial velocity method.
Cosmic context
- Crowded system. One of at least 4 planets orbiting its star.
Properties
- density gcc
- 0.351
- discovery facility
- Roque de los Muchachos Observatory
- discovery method
- Radial Velocity
- dist ly
- 493.7937
- eccentricity
- 0.15
- eq temp k
- 706.59
- insolation
- 41.519
- mass earth
- 82.6354
- name
- XO-2 S b
- orbital period days
- 18.22
- radius earth
- 10.9
- sys num planets
- 4
How to see it
Like any astronomical target, XO-2 S b 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 XO-2 S b is a common exoplanet
XO-2 S b scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 9 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Multi-planet system — 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.