 White dwarf companion gravitationally bending the starlight of KOI-256 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 00m 44.42489s[1] |
| Declination | +49° 33′ 55.2489″[1] |
| Characteristics | |
| KOI-256 A | |
| Evolutionary stage | Red dwarf |
| Spectral type | M3V |
| Apparent magnitude (Kepler) | 15.37 |
| Apparent magnitude (J) | 12.701±0.024 |
| Apparent magnitude (H) | 12.001±0.019 |
| Apparent magnitude (Ks) | 11.783±0.023 |
| Apparent magnitude (r) | 15.754 |
| Apparent magnitude (i) | 14.636 |
| Apparent magnitude (z) | 14.059 |
| R−I color index | 1.118 |
| J−H color index | 0.700±0.031 |
| J−K color index | 0.918±0.033 |
| KOI-256 B | |
| Evolutionary stage | White dwarf |
| Spectral type | D |
| Apparent magnitude (Kepler) | 19.45 |
| Astrometry | |
| Proper motion (μ) | RA: −6.796±0.030 mas/yr[1] Dec.: −14.373±0.030 mas/yr[1] |
| Parallax (π) | 5.6681 ± 0.0228 mas[1] |
| Distance | 575 ± 2 ly (176.4 ± 0.7 pc) |
| Orbit[2] | |
| Companion | KOI-256 B |
| Period (P) | 1.3786548±0.00001 d |
| Semi-major axis (a) | 0.0250±0.0018 AU |
| Eccentricity (e) | 0 |
| Inclination (i) | 89.01±0.65° |
| Periastron epoch (T) | 2455373.635498±0.000036 |
| Argument of periastron (ω) (primary) | 90° |
| Semi-amplitude (K1) (primary) | 106.5±1.8 km/s |
| Details[2] | |
| KOI-256 A | |
| Mass | 0.51±0.15 M☉ |
| Radius | 0.54±0.014 R☉ |
| Temperature | 3450±50 K |
| Metallicity | +0.31±0.10 |
| Rotational velocity (v sin i) | 19.79±0.52 km/s |
| KOI-256 B | |
| Mass | 0.592±0.084 M☉ |
| Radius | 0.01345±0.00091 R☉ |
| Temperature | 7100±800 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| KIC | data |
KOI-256 is a double star located in the constellation Cygnus approximately 575 light-years (176 pc) from Earth.[1] While observations by the Kepler spacecraft suggested the system contained a gas giant exoplanet orbiting a red dwarf, later studies determined that KOI-256 was a binary system composed of the red dwarf orbiting a white dwarf.[3][4]
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