KOI-5
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 18m 57.5306s |
| Declination | +44° 38′ 50.619″ |
| Apparent magnitude (V) | 11.78 |
| Characteristics | |
| Spectral type | G2V |
| Astrometry | |
| Radial velocity (Rv) | −35.16 km/s |
| Proper motion (μ) | RA: +3.216 mas/yr Dec.: −10.925 mas/yr |
| Parallax (π) | 1.7436±0.0666 mas |
| Distance | 1,870 ± 70 ly (570 ± 20 pc) |
| Position (relative to KOI-5A) | |
| Component | KOI-5B |
| Epoch of observation | 2016 |
| Angular distance | 0.029±0.050″ |
| Position angle | 142.1±1.0° |
| Projected separation | 16 AU |
| Position (relative to KOI-5A) | |
| Component | KOI-5C |
| Epoch of observation | 2016 |
| Angular distance | 0.141±0.050″ |
| Position angle | 304.3±2.2° |
| Projected separation | 78 AU |
| Details | |
| KOI-5A | |
| Mass | 1.13 M☉ |
| Radius | 1.840±0.017 R☉ |
| Luminosity | 3.86±0.17 L☉ |
| Surface gravity (log g) | 4.19 cgs |
| Temperature | 5861 K |
| Age | 3.49±0.41 Gyr |
| KOI-5B | |
| Mass | 1.09 M☉ |
| Other designations | |
| TOI-1241, 2MASS J19185753+4438507, KIC 8554498, Gaia EDR3 2126945668448657664 | |
| KOI-5A: | |
| KOI-5B: | |
| Database references | |
| SIMBAD | data |
KOI-5 is a triple star system composed of three stars: KOI-5 A, KOI-5 B and KOI-5 C, orbiting 1,870±70 light-years away.
The two dim stellar companions to KOI-5A were discovered in 2016. KOI-5 A and B orbit each other every 29 years, and KOI-5 C orbits stars A and B every 400 years. KOI-5C is physically associated with the core stellar pair with probability 99.98%.