The Kepler-173 system contains 2 exoplanets. It is located 2717.42 light years away from the solar system.
| Mass | 0.79 solar masses |
| Radius | 0.95 solar radiae |
| Temperature | 6031 kelvin |
| Stellar Metallicity | 0.036 decimal exponent |
| Age | 3.3 billion years |
At 2.213 Earth masses, Kepler-173 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 2.210 Earth masses |
| Density | 5.660 grams per cubic centimeter |
| Radius | 1.290 Earth radiae |
| Semi-major Axis | 0.048 AU |
| Eccentricity | 0 |
| Orbital Period | 4.264 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |
At more than 10 Earth masses, Kepler-173 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 6.480 Earth masses |
| Density | 2.480 grams per cubic centimeter |
| Radius | 2.430 Earth radiae |
| Semi-major Axis | 0.074 AU |
| Eccentricity | 0 |
| Orbital Period | 8.006 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |