2MASS J19383260+4603591 (commonly abbreviated to 2M J1938+4603, also known as Kepler-451) is a binary star system with at least one known planet, Kepler-451b. The system comprises two stars, a pulsating subdwarf B star as well as a small red dwarf star.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 38m 32.61s[1] |
| Declination | 46h 03m 59.1s[1] |
| Characteristics | |
| Spectral type | sdBV/M |
| Astrometry | |
| Proper motion (μ) | RA: 5.23±0.04 mas/yr[2] Dec.: -4.40±0.04 mas/yr[2] |
| Parallax (π) | 2.4400 ± 0.0316 mas[2] |
| Distance | 1,340 ± 20 ly (410 ± 5 pc) |
| Orbit[3] | |
| Period (P) | 0.12576528 d |
| Details | |
| Kepler-451 A | |
| Mass | 0.48±0.03[1] [4] M☉ |
| Radius | 0.223±0.004/0.158±0.003[1] [4] R☉ |
| Temperature | 29564±106[1][4] K |
| Age | 6±2 Gyr |
| Kepler-451 B | |
| Mass | 0.120±0.010 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
It has at least one confirmed exoplanet, Kepler-451b, discovered in 2015[6] by the Kepler spacecraft. The discovery was disputed in 2020,[3] but in 2022 confirmation of Kepler-451b and the discovery of two additional planets was announced.[7]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| d | 1.76±0.18 MJ | 0.20±0.03 | 43.0±0.1 | 0 | — | — |
| b | 1.86±0.05 MJ | 0.90±0.04 | 406±4 | 0.33±0.05 | <43[3]° | — |
| c | 1.61±0.14 MJ | 2.1±0.2 | 1460±90 | 0.29±0.07 | — | — |