Astronomy:KOI-5
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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]
Planetary system
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⊕ |
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; Van Belle, G. T. et al. (2017), "The Kepler Follow-Up Observation Program. I. A Catalog of Companions To Kepler Stars from High-Resolution Imaging", The Astronomical Journal 153 (2): 71, doi:10.3847/1538-3881/153/2/71, Bibcode: 2017AJ....153...71F
- ↑ Bellinger, E. P.; Hekker, S.; Angelou, G. C.; Stokholm, A.; Basu, S. (2020), "Stellar ages, masses, and radii from asteroseismic modeling are robust to systematic errors in spectroscopy", Astronomy & Astrophysics 622: A130, doi:10.1051/0004-6361/201834461
- ↑ 4.0 4.1 4.2 4.3 4.4 AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
- ↑ 5.0 5.1 Batalha, Natalie M.; Rowe, Jason F.; Bryson, Stephen T.; Barclay, Thomas; Burke, Christopher J.; Caldwell, Douglas A.; Christiansen, Jessie L.; Mullally, Fergal et al. (2013), "Planetary Candidates Observed by Kepler . III. Analysis of the First 16 Months of Data", The Astrophysical Journal Supplement Series 204 (2): 24, doi:10.1088/0067-0049/204/2/24, Bibcode: 2013ApJS..204...24B
- ↑ 6.0 6.1 Hirsch, Lea A.; Ciardi, David R.; Howard, Andrew W.; Everett, Mark E.; Furlan, Elise; Saylors, Mindy; Horch, Elliott P.; Howell, Steve B. et al. (2017), "Assessing the Effect of Stellar Companions from High-resolution Imaging of Kepler Objects of Interest", The Astronomical Journal 153 (3): 117, doi:10.3847/1538-3881/153/3/117, Bibcode: 2017AJ....153..117H
- ↑ Chen, Rick (2021-01-11). "Planetary Sleuthing Finds Triple-Star World". http://www.nasa.gov/feature/ames/planetary-sleuthing-finds-triple-star-world.
- ↑ 8.0 8.1 "Exoplanet Archive". https://exoplanetarchive.ipac.caltech.edu/overview/KOI-5.02#planet_KOI-5-02_collapsible.
Coordinates: 
19h 18m 57.5312s, +44° 38′ 50.6176″
 | This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it. |
 |  |
