About GJ 2030 b
GJ 2030 b is a rare exoplanet. It lies about 120.9 light-years from Earth, has an equilibrium temperature near 2,147 K, spans roughly 2.03 Earth radii and weighs about 4.77 Earth masses.
Its surface is likely an ocean of molten rock.
Rare exoplanet 38 EP
GJ 2030 b
RA 50.8238° · Dec -7.7950° · exoplanet
Score breakdown
· 5 badgesRare 46 pts → Epic
- Lava world +14
- Blasted by starlight +8
- Multi-planet system +6
- Confirmed exoplanet +5
- Sub-Neptune +5
Total score 38
8 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Sub-Neptune · +5
- Lava world · +14
- Multi-planet system · +6
- Blasted by starlight · +8
Trivia
What makes it special
- Lava world. Its surface is likely an ocean of molten rock.
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 2.1 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 188.8 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 1209 years in a starship at a tenth of light speed.
- Distance. 121 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1905.
Saying hello
- Say hello. A radio message and its reply would take 242 years round-trip.
Standing on it
- A year here. A full year lasts just 2.4 Earth days.
By the numbers
- Size. About 2× the width of Earth.
- Volume. About 8.4 Earths could fit inside it.
- Mass. About 4.8× the mass of Earth.
- Your weight. You'd weigh about 1.2× your Earth weight standing here.
- Temperature. Around 2147 K — hot enough to vaporise iron.
How we found it
- Discovery. Found by Multiple Observatories using the radial velocity method.
Cosmic context
- Crowded system. One of at least 2 planets orbiting its star.
Properties
- density gcc
- 3.13
- discovery facility
- Multiple Observatories
- discovery method
- Radial Velocity
- dist ly
- 120.9347
- eccentricity
- 0.239
- eq temp k
- 2147.31
- insolation
- 3542.7587
- mass earth
- 4.7674
- name
- GJ 2030 b
- orbital period days
- 2.3813
- radius earth
- 2.03
- sys num planets
- 2
How to see it
Like any astronomical target, GJ 2030 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 2030 b is a rare exoplanet
GJ 2030 b scores 38 points on Spacedle's rarity scale, which places it in the rare tier. Another 8 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Sub-Neptune, Lava world, Multi-planet system and Blasted by starlight — 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.