About Kepler-99 b
Kepler-99 b is a rare exoplanet. It lies about 679.6 light-years from Earth, has an equilibrium temperature near 810 K, spans roughly 1.48 Earth radii and weighs about 6.15 Earth masses.
Packed denser than solid iron.
Rare exoplanet 34 EP
Kepler-99 b
RA 297.3540° · Dec 41.3000° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Denser than iron +18
- Super-Earth +8
- Confirmed exoplanet +5
- Found by Kepler +3
Total score 34
12 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Super-Earth · +8
- Denser than iron · +18
- Found by Kepler · +3
Trivia
What makes it special
- Heavyweight. Packed denser than solid iron.
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 11.9 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 1.1 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 6796 years in a starship at a tenth of light speed.
- Distance. 680 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1346.
Saying hello
- Say hello. A radio message and its reply would take 1359 years round-trip.
Standing on it
- A year here. A full year lasts just 4.6 Earth days.
By the numbers
- Size. About 1.5× the width of Earth.
- Mass. About 6.2× the mass of Earth.
- Your weight. You'd weigh about 2.8× your Earth weight standing here.
- Density. Denser than solid iron.
- Temperature. Around 537°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Kepler using the transit method.
Properties
- density gcc
- 10.9
- discovery facility
- Kepler
- discovery method
- Transit
- dist ly
- 679.608
- eccentricity
- 0
- eq temp k
- 810
- insolation
- 108.042
- mass earth
- 6.15
- name
- Kepler-99 b
- orbital period days
- 4.6036
- radius earth
- 1.48
- sys num planets
- 1
How to see it
Like any astronomical target, Kepler-99 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-99 b is a rare exoplanet
Kepler-99 b scores 34 points on Spacedle's rarity scale, which places it in the rare tier. Another 12 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, Denser than iron 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.