About 47 UMa c
47 UMa c is a common exoplanet. It lies about 45 light-years from Earth, has an equilibrium temperature near 164 K, spans roughly 14.2 Earth radii and weighs about 171.62 Earth masses.
One of at least 3 planets orbiting its star.
Common exoplanet 15 EP
47 UMa c
RA 164.8648° · Dec 40.4305° · 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. ≈ 790.8 thousand years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 70.3 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 450 years in a starship at a tenth of light speed.
- Distance. 45 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1981.
Saying hello
- Say hello. A radio message and its reply would take 90 years round-trip.
Standing on it
- A year here. A full year lasts about 6.5 Earth years.
By the numbers
- Size. About 14.2× the width of Earth.
- Volume. About 2863 Earths could fit inside it.
- Mass. Roughly 172× Earth's mass — about 0.5 Jupiters.
- Your weight. You'd weigh about 0.9× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. A frigid -109°C — colder than dry ice.
How we found it
- Discovery. Found by Lick Observatory using the radial velocity method.
Cosmic context
- Crowded system. One of at least 3 planets orbiting its star.
Properties
- density gcc
- 0.329
- discovery facility
- Lick Observatory
- discovery method
- Radial Velocity
- dist ly
- 44.9988
- eccentricity
- 0.098
- eq temp k
- 164.38
- insolation
- 0.1217
- mass earth
- 171.621
- name
- 47 UMa c
- orbital period days
- 2391
- radius earth
- 14.2
- sys num planets
- 3
How to see it
Like any astronomical target, 47 UMa c 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 47 UMa c is a common exoplanet
47 UMa c 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.