About Kepler-447 b
Kepler-447 b is a trash exoplanet. It lies about 874.2 light-years from Earth, has an equilibrium temperature near 882 K, spans roughly 18.49 Earth radii and weighs about 435.41 Earth masses.
About 18.5× the width of Earth.
Trash exoplanet 12 EP
Kepler-447 b
RA 285.2685° · Dec 48.5599° · exoplanet
Score breakdown
· 3 badgesTrash 15 pts → Common
- Confirmed exoplanet +5
- Gas giant +4
- Found by Kepler +3
Total score 12
3 more points to reach Common.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Found by Kepler · +3
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 15.4 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 1.4 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 8742 years in a starship at a tenth of light speed.
- Distance. 874 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1152.
Saying hello
- Say hello. A radio message and its reply would take 1748 years round-trip.
Standing on it
- A year here. A full year lasts just 7.8 Earth days.
By the numbers
- Size. About 18.5× the width of Earth.
- Volume. About 6321 Earths could fit inside it.
- Mass. Roughly 435× Earth's mass — about 1.4 Jupiters.
- Your weight. You'd weigh about 1.3× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. Around 609°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Kepler using the transit method.
Properties
- density gcc
- 0.4
- discovery facility
- Kepler
- discovery method
- Transit
- dist ly
- 874.2318
- eccentricity
- 0.123
- eq temp k
- 882
- insolation
- 119.039
- mass earth
- 435.41
- name
- Kepler-447 b
- orbital period days
- 7.7943
- radius earth
- 18.49
- sys num planets
- 1
How to see it
Like any astronomical target, Kepler-447 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 Kepler-447 b is a trash exoplanet
Kepler-447 b scores 12 points on Spacedle's rarity scale, which places it in the trash tier. Another 3 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Found by Kepler — 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.