| |
Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
---|---|
Constellation | Cygnus |
Right ascension | 19h35m 02.0012s[4] |
Declination | +41° 52′ 18.692″[4] |
Apparent magnitude (V) | 13 |
Characteristics | |
Evolutionary stage | red giant[5] |
Spectral type | K3III |
Astrometry | |
Radial velocity (Rv) | -53.740601[1] km/s |
Proper motion (μ) | RA: −6.596(12) mas/yr[4] Dec.: −12.081(13) mas/yr[4] |
Parallax (π) | 1.0755 ± 0.0118 mas[4] |
Distance | 3,030 ± 30 ly (930 ± 10 pc) |
Details[5] | |
Mass | 1.286±0.011 M☉ |
Radius | 4.179±0.132 R☉ |
Luminosity (bolometric) | 9.589±0.129 L☉ |
Temperature | 4973±14 K |
Metallicity [Fe/H] | 0.0251±0.013 dex |
Age | 3.917±0.157 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Kepler-56 is a red giant[6] in constellation Cygnus roughly 3,030 light-years (930 pc) away[4] with slightly more mass than the Sun.
Kepler-56 is a red giant star. This means it is no longer fusing hydrogen in its core and is off the main sequence. Its mass is around 1.3 M⊙. Its radius is about 4.2 R⊙, putting the star's density at about 0.025 g/cm3. For reference, the Sun's density is about 1.408 g/cm3. Its metallicity is about 0.0251 Z0/X0. Its luminosity is about 9.6 L⊙, and its effective temperature is 4,973 K (4,700 °C; 8,492 °F), classifying Kepler-56 as spectral class K3III.[5]
Kepler-56 is about 3.9 billion years old,[5] placing it as about 600 million years younger than our Sun. Its apparent magnitude is +13, making it too dim to be visible to the naked eye.
In 2012, scientists discovered a two-planet planetary system around Kepler-56 via the transit method. Asteroseismological studies revealed that the orbits of Kepler-56b and Kepler-56c are coplanar but about 45° misaligned to the host star's equator. In addition, follow-up radial velocity measurements showed evidence of a gravitational perturbator.[6] It was confirmed in 2016 the perturbations are caused by third, non-transiting planet: Kepler-56d.[7]
The planetary system is very compact but is dynamically stable.[8]
Kepler-56 is expanding. As a result, it will devour Kepler-56b and Kepler-56c in 130 and 155 million years, respectively.[9][10] 56d will be far enough to survive its parent star's red giant phase.
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b[2][11] | 0.07 MJ | 0.1028 | 10.5034294 | — | 79.640° | 3.606495320 R🜨 |
c[3][12] | 0.569 MJ | 0.1652 | 21.4050484 | — | 81.930° | 7.844702558 R🜨 |
d[7] | >5.61±0.38 MJ | 2.16±0.08 | 1002±5 | 0.20±0.01 | — | — |
2012 in space
| ||
---|---|---|
2013 » | ||
Space probe launches |
| |
Impact events |
| |
Selected NEOs |
| |
Exoplanets |
| |
Discoveries |
| |
Comets |
| |
Space exploration |
| |
|
This giant-star-related article is a stub. You can help Wikipedia by expanding it. |