Kepler-296 is a binary star system[3] in the constellation Draco. The primary star appears to be a late K-type main-sequence star, while the secondary is a red dwarf.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 19h 06m 09.60253s[1] |
| Declination | +49° 26′ 14.3969″[1] |
| Characteristics | |
| Spectral type | K7 V + M1 V[2] |
| Astrometry | |
| Proper motion (μ) | RA: 2.635 mas/yr[1] Dec.: −16.375 mas/yr[1] |
| Parallax (π) | 4.5538 ± 0.5562 mas[1] |
| Distance | approx. 720 ly (approx. 220 pc) |
| Details[3] | |
| Kepler-296 A | |
| Mass | 0.498+0.067 −0.087 M☉ |
| Radius | 0.480+0.066 −0.087 R☉ |
| Surface gravity (log g) | 4.774+0.091 −0.059 cgs |
| Temperature | 3740±130 K |
| Metallicity [Fe/H] | −0.08+0.28 −0.30 dex |
| Kepler-296 B | |
| Mass | 0.326+0.070 −0.079 M☉ |
| Radius | 0.322+0.060 −0.068 R☉ |
| Surface gravity (log g) | 4.993+0.087 −0.063 cgs |
| Temperature | 3440±75 K |
| Metallicity [Fe/H] | −0.08+0.28 −0.30 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system
Five exoplanets have been detected around the system; all are believed to be orbiting the primary star rather than its dimmer companion.[3] Two planets in particular, Kepler-296e and Kepler-296f, are likely located in the habitable zone.[3] For the planetary system to remain stable, no additional giant planets can be located up to orbital radius 10.1 AU.[6]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.079 | 10.864384 | <0.33 | — | 1.61 R🜨 |
| c | — | 0.0521 | 5.8416366 | <0.33 | — | 2.00 R🜨 |
| d | — | 0.118 | 19.850291 | <0.33 | — | 2.09 R🜨 |
| e | — | 0.169 | 34.14211 | <0.33 | — | 1.53 R🜨 |
| f | — | 0.255 | 63.33627 | <0.33 | — | 1.80 R🜨 |