About GJ 876 b
GJ 876 b is an uncommon exoplanet. It lies about 15.2 light-years from Earth, has an equilibrium temperature near 191 K, spans roughly 13.3 Earth radii and weighs about 723.22 Earth masses.
One of at least 4 planets orbiting its star.
Uncommon exoplanet 27 EP
GJ 876 b
RA 343.3240° · Dec -14.2666° · exoplanet
Score breakdown
· 4 badgesUncommon 33 pts → Rare
- Nearby (<25 ly) +12
- Multi-planet system +6
- Confirmed exoplanet +5
- Gas giant +4
Total score 27
6 more points to reach Rare.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Multi-planet system · +6
- Nearby (<25 ly) · +12
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 268 thousand years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 23.8 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 152 years in a starship at a tenth of light speed.
- Distance. 15.2 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 2011.
Saying hello
- Say hello. A radio message and its reply would take 30.5 years round-trip.
Standing on it
- A year here. A full year lasts just 61.1 Earth days.
By the numbers
- Size. About 13.3× the width of Earth.
- Volume. About 2353 Earths could fit inside it.
- Mass. Roughly 723× Earth's mass — about 2.3 Jupiters.
- Your weight. You'd weigh about 4.1× your Earth weight standing here.
- Temperature. A frigid -83°C — colder than dry ice.
How we found it
- Discovery. Found by Multiple Observatories using the radial velocity method.
Cosmic context
- Crowded system. One of at least 4 planets orbiting its star.
Properties
- density gcc
- 1.69
- discovery facility
- Multiple Observatories
- discovery method
- Radial Velocity
- dist ly
- 15.2483
- eccentricity
- 0.0324
- eq temp k
- 190.6
- insolation
- 0.2857
- mass earth
- 723.2235
- name
- GJ 876 b
- orbital period days
- 61.1166
- radius earth
- 13.3
- sys num planets
- 4
How to see it
Like any astronomical target, GJ 876 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 GJ 876 b is an uncommon exoplanet
GJ 876 b scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Multi-planet system and Nearby (<25 ly) — 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.