KOI-5
Coordinates: 
19h 18m 57.5312s, +44° 38′ 50.6176″
19h 18m 57.5312s, +44° 38′ 50.6176″| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 18m 57.5312s |
| Declination | +44° 38′ 50.6176″ |
| Position (relative to KOI-5A)[2] | |
| Component | KOI-5B |
Projected separation | 16[citation needed] AU |
| Position (relative to KOI-5A)[2] | |
| Component | KOI-5C |
Projected separation | 78[citation needed] AU |
| Details 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]
Planetary system
Two planets orbiting one of KOI-5's stars were suspected since 2009 based on
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🜨 |
References
- ^ .
- ^ S2CID 38339900
- S2CID 119293351
- ^ a b c d e AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
- ^ S2CID 19023502
- ^ S2CID 39321033
- ^ Chen, Rick (2021-01-11). "Planetary Sleuthing Finds Triple-Star World". NASA. Retrieved 2021-01-13.
- ^ a b "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2021-07-17.