About Kepler-139 f
Kepler-139 f is a rare exoplanet. It lies about 1,275.4 light-years from Earth, spans roughly 6.67 Earth radii, weighs about 36 Earth masses and completes an orbit every 355 days.
Crammed into a system of five or more planets.
Rare exoplanet 39 EP
Kepler-139 f
RA 282.3919° · Dec 43.8894° · exoplanet
Score breakdown
· 5 badgesRare 46 pts → Epic
- Richly packed system +14
- Distant (>1000 ly) +10
- Multi-planet system +6
- Confirmed exoplanet +5
- Gas giant +4
Total score 39
7 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Multi-planet system · +6
- Richly packed system · +14
- Distant (>1000 ly) · +10
Trivia
What makes it special
- Packed system. Crammed into a system of five or more planets.
Could we get there?
- Verdict. Impossible with our current technology — and the next millennium of it.
Getting there
- Aboard Voyager 1. ≈ 22.4 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 2 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 12.8 thousand years in a starship at a tenth of light speed.
- Distance. 1275 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 751.
Saying hello
- Say hello. A radio message and its reply would take 2551 years round-trip.
Standing on it
- A year here. A full year lasts just 355 Earth days.
By the numbers
- Size. About 6.7× the width of Earth.
- Volume. About 297 Earths could fit inside it.
- Mass. About 36× the mass of Earth.
- Your weight. You'd weigh about 0.8× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
How we found it
- Discovery. Found by Multiple Observatories using the transit timing variations method.
Cosmic context
- Crowded system. One of at least 5 planets orbiting its star.
Properties
- density gcc
- 0.667
- discovery facility
- Multiple Observatories
- discovery method
- Transit Timing Variations
- dist ly
- 1275.3939
- mass earth
- 36
- name
- Kepler-139 f
- orbital period days
- 355
- radius earth
- 6.67
- sys num planets
- 5
How to see it
Like any astronomical target, Kepler-139 f 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 Kepler-139 f is a rare exoplanet
Kepler-139 f scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Multi-planet system, Richly packed system and Distant (>1000 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.