Kepler-448 c
Kepler-448 c is a exoplanet orbiting KOI-12 in the constellation Cygnus. It lies about 1,303 light-years from Earth and was discovered in 2017 using the transit timing variations method.
Is Kepler-448 c in the Habitable Zone?
The position of Kepler-448 c relative to the habitable zone of KOI-12 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-448 c — one full orbit around KOI-12 — lasts 2,500.0 Earth days, longer than an Earth year. It orbits at an average distance of 4.200 AU. Its orbit is highly elliptical (eccentricity 0.65), swinging dramatically closer to and farther from its star.
How Was Kepler-448 c Discovered?
Kepler-448 c was discovered in 2017 using the transit timing variations method, with observations from Kepler.
Transit timing variations reveal a planet through its gravitational tug on a sibling planet, which makes that sibling's transits arrive slightly early or late. The pattern of these deviations betrays the hidden planet's mass and orbit.
How Far Away Is Kepler-448 c?
Kepler-448 c is 1,302.7 light-years (399.4 parsecs) from Earth. Light arriving here tonight left the planet about 1,303 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,927,520 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. Kepler-448 c scores 0.28, ranking #2,203 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KOI-12
KOI-12
- Mass
- 1.50 M☉
- Radius
- 1.40 R☉
The KOI-12 Planetary System
Kepler-448 c is one of 2 known planets in the KOI-12 system. Its siblings:
- KOI-12 b (Cold Gas Giant)
Kepler-448 c — Complete Data
| Mass | 6,992.26 Earth masses (22.000 Jupiter masses) |
|---|---|
| Orbital period | 2,500.00 days |
| Orbital distance | 4.200 AU |
| Eccentricity | 0.650 |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 1,302.7 light-years (399.4 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit Timing Variations |
| Discovery facility | Kepler |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2019-11-01. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-448 c
Is Kepler-448 c habitable?
Kepler-448 c is not known to orbit within the habitable zone of KOI-12.
How far away is Kepler-448 c?
Kepler-448 c is about 1,303 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,927,520 years to get there.
How long is a year on Kepler-448 c?
One orbit around KOI-12 takes 2,500.0 Earth days.
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