KIC 9832227
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 29m 15.948s |
| Declination | +46° 37′ 19.89″ |
| Apparent magnitude (V) | 12.27 - 12.46 |
| Astrometry | |
| Distance | 1843 ly (565pc) |
| Orbit | |
| Period (P) | 0.45796151 days |
| Semi-major axis (a) | 2.992 R☉ |
| Inclination (i) | 53.2° |
| Periastron epoch (T) | 2455688.49913 |
| Details | |
| A | |
| Mass | 1.395 M☉ |
| Radius | 1.581 R☉ |
| Luminosity | 2.609 L☉ |
| Surface gravity (log g) | 4.19 cgs |
| Temperature | 5800 K |
| Rotational velocity (v sin i) | 149.7 km/s |
| B | |
| Mass | 0.318 M☉ |
| Radius | 0.830 R☉ |
| Luminosity | 0.789 L☉ |
| Surface gravity (log g) | 4.10 cgs |
| Temperature | 5920 K |
| Rotational velocity (v sin i) | 84.7 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
KIC 9832227 is a contact binary star system in the constellation of Cygnus, located about 1800 light-years away. It is also identified as an eclipsing binary with a periodicity of almost 11 hours. A merger, producing a luminous red nova, is predicted to be visible to the naked eye, reaching magnitude 2, for a few weeks between September 2021 and September 2022.
The period of the variations has been observed to be growing shorter since 2013. It is predicted that, as the stars' outer atmospheres interact with each other, the period will grow shorter still, and end in the merging of the two cores. This releases a very large amount of energy, a process which has been observed before in the star V1309 Scorpii, whose merger was observed in 2008 by a team led by Romuald Tylenda. However, astronomers in Tylenda's team have questioned the reliability of the prediction, because it is based on a model that may not be accurate enough to predict the outburst time so precisely.
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