Kepler-16

Kepler-16 A/B

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 18.175s
Declination	+51° 45′ 26.76″
Characteristics
Spectral type	K / M
Astrometry
Distance	196 ly (60 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	4450 (± 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	~3311 K
Other designations
KIC 12644769, 2MASS 19161817+5145267
Database references
SIMBAD	data
KIC	data

Kepler-16 is a 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.

Kepler-16b is a gas giant that orbits the two stars in the Kepler-16 system. The planet is a third of Jupiter's mass and slightly smaller than Saturn at 0.7538 Jupiter radii, but is more dense. Kepler-16b completes a nearly circular orbit every 228.776 days.

Coordinates: 19^h 16^m 18.17^s, +51° 45′ 26.78″