Observation data Epoch J2000 Equinox | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 18m 57.5312s |
Declination | +44° 38′ 50.6176″ |
Astrometry | |
Radial velocity (Rv) | -35.16 [1] km/s |
Proper motion (μ) | RA: 3.216 [1] mas/yr Dec.: -10.925 [1] mas/yr |
Parallax (π) | 1.7436 ± 0.0666 [1] mas |
Distance | 1,870 ± 70 ly (570 ± 20 pc) |
Position (relative to KOI-5A) [2] | |
Component | KOI-5B |
Epoch of observation | 2016 |
Angular distance | 0.029±0.050″ |
Position angle | 142.1±1.0° |
Observed separation (projected) | 16[ citation needed ] AU |
Position (relative to KOI-5A) [2] | |
Component | KOI-5C |
Epoch of observation | 2016 |
Angular distance | 0.141±0.050″ |
Position angle | 304.3±2.2° |
Observed separation (projected) | 78[ citation needed ] AU |
Details [3] | |
KOI-5A | |
Mass | 1.13 [4] M☉ |
Radius | 1.840±0.017 R☉ |
Luminosity | 3.86±0.17 L☉ |
Surface gravity (log g) | 4.19 [5] cgs |
Temperature | 5861 [5] K |
Age | 3.49±0.41 Gyr |
KOI-5B | |
Mass | 1.09 [4] 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. [2] KOI-5 A and B orbit each other every 29 years, and KOI-5 C orbits stars A and B every 400 years. [4] KOI-5C is physically associated with the core stellar pair with probability 99.98%. [6]
Two planets orbiting one of KOI-5's stars were suspected since 2009 based on Kepler data, but KOI-5Ab was confirmed only in January 2021 after TESS determined the planet is orbiting KOI-5A. The exoplanet has caused interest in the scientific community because its orbital plane is misaligned with the closer star, suggesting it gave KOI-5Ab a gravitational kick during its development, resulting in the misalignment and inward migration to the current orbit. [4] [7] However, the confirmation of this planet has yet to be published in any peer-reviewed journal.
A second candidate planet was initially suspected, but was later found to be a false positive. [8]
Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.179 MJ | 0.0596060 | 5 | — | — | 7.07 R🜨 |
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