Kepler-16
Kepler-16 is an eclipsing binary star system in the constellation of Cygnus that was targeted by the Kepler spacecraft. Both stars are smaller than the Sun; the primary, Kepler-16A, is a K-type main-sequence star and the secondary, Kepler-16B, is an M-type red dwarf. They are separated by 0.22 AU, and complete an orbit around a common center of mass every 41 days. The system is host to one known extrasolar planet in circumbinary orbit: the Saturn-sized Kepler-16b.
An artist's rendering of the Kepler-16 system, showing the binary star being orbited by Kepler-16b. Credit: NASA/JPL-Caltech | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 16m 18.1759s |
| Declination | +51° 45′ 26.778″ |
| Characteristics | |
| Spectral type | K / M |
| Astrometry | |
| Proper motion (μ) | RA: 14.041±0.054 mas/yr Dec.: −48.601±0.051 mas/yr |
| Parallax (π) | 13.2893 ± 0.0271 mas |
| Distance | 245.4 ± 0.5 ly (75.2 ± 0.2 pc) |
| Orbit | |
| Primary | Kepler-16A |
| Companion | Kepler-16B |
| Period (P) | 41.079220±0.000078 d |
| Semi-major axis (a) | 0.22431±0.00035 AU |
| Eccentricity (e) | 0.15944±0.00062 |
| Inclination (i) | 90.30401±0.0019° |
| Longitude of the node (Ω) | 0° |
| Periastron epoch (T) | BJD 2455212.12316 |
| Argument of periastron (ω) (secondary) | 263.464±0.027° |
| Details | |
| Kepler-16A | |
| Mass | 0.6897±0.0035 M☉ |
| Radius | 0.6489±0.0013 R☉ |
| Luminosity | 0.148 L☉ |
| Surface gravity (log g) | 4.6527±0.0017 cgs |
| Temperature | 4,450±150) K |
| Metallicity [Fe/H] | −0.3±0.2 dex |
| Rotation | 35.1±1.0 days |
| Kepler-16B | |
| Mass | 0.20255±0.00065 M☉ |
| Radius | 0.22623±0.00059 R☉ |
| Luminosity | ~0.0057 L☉ |
| Surface gravity (log g) | 5.0358±0.0017 cgs |
| Temperature | ~3,311 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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