About Kepler-42 c
Kepler-42 c is an epic exoplanet. It lies about 130.7 light-years from Earth, has an equilibrium temperature near 720 K, spans roughly 0.73 Earth radii and weighs about 60.34 Earth masses.
Packed denser than solid iron.
Epic exoplanet 46 EP
Kepler-42 c
RA 292.2196° · Dec 44.6174° · exoplanet
Score breakdown
· 5 badgesEpic 68 pts → Anomaly
- Denser than iron +18
- Ultra-short period +14
- Multi-planet system +6
- Confirmed exoplanet +5
- Found by Kepler +3
Total score 46
22 more points to reach Anomaly.
Badges
- Confirmed exoplanet · +5
- Ultra-short period · +14
- Denser than iron · +18
- Multi-planet system · +6
- 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. ≈ 2.3 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 204 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 1307 years in a starship at a tenth of light speed.
- Distance. 131 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1895.
Saying hello
- Say hello. A radio message and its reply would take 261 years round-trip.
Standing on it
- A year here. A full year lasts just 0.5 Earth days.
By the numbers
- Size. Around 73% of Earth's width.
- Mass. Roughly 60.3× Earth's mass — about 0.2 Jupiters.
- Your weight. You'd weigh about 113.2× your Earth weight standing here.
- Density. Denser than solid iron.
- Temperature. Around 447°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Kepler using the transit method.
Cosmic context
- Crowded system. One of at least 3 planets orbiting its star.
Properties
- density gcc
- 98
- discovery facility
- Kepler
- discovery method
- Transit
- dist ly
- 130.6565
- eccentricity
- 0
- eq temp k
- 720
- insolation
- 82.125
- mass earth
- 60.337
- name
- Kepler-42 c
- orbital period days
- 0.4533
- radius earth
- 0.73
- sys num planets
- 3
How to see it
Like any astronomical target, Kepler-42 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 Kepler-42 c is an epic exoplanet
Kepler-42 c scores 46 points on Spacedle's rarity scale, which places it in the epic tier. Another 22 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Ultra-short period, Denser than iron, Multi-planet system 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.