KOI-5
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 18m 57.5306s[2] |
| Declination | +44° 38′ 50.619″[2] |
| Apparent magnitude (V) | 11.78[3] |
| Characteristics | |
| Spectral type | G2V[4] |
| Astrometry | |
| Radial velocity (Rv) | −35.16[2] km/s |
| Proper motion (μ) | RA: +3.216[2] mas/yr Dec.: −10.925[2] mas/yr |
| Parallax (π) | 1.7436±0.0666 mas[2] |
| Distance | 1,870 ± 70 ly (570 ± 20 pc) |
| Position (relative to KOI-5A)[3] | |
| Component | KOI-5B |
| Epoch of observation | 2016 |
| Angular distance | 0.029±0.050″ |
| Position angle | 142.1±1.0° |
| Projected separation | 16[citation needed] AU |
| Position (relative to KOI-5A)[3] | |
| Component | KOI-5C |
| Epoch of observation | 2016 |
| Angular distance | 0.141±0.050″ |
| Position angle | 304.3±2.2° |
| Projected separation | 78[citation needed] AU |
| Details[5] | |
| KOI-5A | |
| Mass | 1.13[6] M☉ |
| Radius | 1.840±0.017 R☉ |
| Luminosity | 3.86±0.17 L☉ |
| Surface gravity (log g) | 4.19[7] cgs |
| Temperature | 5861[7] K |
| Age | 3.49±0.41 Gyr |
| KOI-5B | |
| Mass | 1.09[6] 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.[3] KOI-5 A and B orbit each other every 29 years, and KOI-5 C orbits stars A and B every 400 years.[6] KOI-5C is physically associated with the core stellar pair with probability 99.98%.[8]
Planetary system
[edit]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.[6][9] 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.[10]
| 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
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; Van Belle, G. T.; Hirsch, L. A.; Gautier, T. N.; Adams, E. R.; Barrado, D.; Cartier, K. M. S.; Dressing, C. D.; Dupree, A. K.; Gilliland, R. L.; Lillo-Box, J.; Lucas, P. W.; Wang, J. (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. arXiv:1612.02392. Bibcode:2017AJ....153...71F. doi:10.3847/1538-3881/153/2/71. S2CID 38339900.
- ^ Frasca, A.; Molenda-Żakowicz, J.; De Cat, P.; Catanzaro, G.; Fu, J. N.; Ren, A. B.; Luo, A. L.; Shi, J. R.; Wu, Y.; Zhang, H. T. (2016). "Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra". Astronomy and Astrophysics. 594. arXiv:1606.09149. Bibcode:2016A&A...594A..39F. doi:10.1051/0004-6361/201628337.
- ^ 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. arXiv:1812.06979. doi:10.1051/0004-6361/201834461. S2CID 119293351.
- ^ a b c d e AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
- ^ a b Batalha, Natalie M.; Rowe, Jason F.; Bryson, Stephen T.; Barclay, Thomas; Burke, Christopher J.; Caldwell, Douglas A.; Christiansen, Jessie L.; Mullally, Fergal; Thompson, Susan E.; Brown, Timothy M.; Dupree, Andrea K.; Fabrycky, Daniel C.; Ford, Eric B.; Fortney, Jonathan J.; Gilliland, Ronald L.; Isaacson, Howard; Latham, David W.; Marcy, Geoffrey W.; Quinn, Samuel N.; Ragozzine, Darin; Shporer, Avi; Borucki, William J.; Ciardi, David R.; Gautier, Thomas N.; Haas, Michael R.; Jenkins, Jon M.; Koch, David G.; Lissauer, Jack J.; Rapin, William; 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. arXiv:1202.5852. Bibcode:2013ApJS..204...24B. doi:10.1088/0067-0049/204/2/24. S2CID 19023502.
- ^ a b Hirsch, Lea A.; Ciardi, David R.; Howard, Andrew W.; Everett, Mark E.; Furlan, Elise; Saylors, Mindy; Horch, Elliott P.; Howell, Steve B.; Teske, Johanna; Marcy, Geoffrey W. (2017). "Assessing the Effect of Stellar Companions from High-resolution Imaging of Kepler Objects of Interest". The Astronomical Journal. 153 (3): 117. arXiv:1701.06577. Bibcode:2017AJ....153..117H. doi:10.3847/1538-3881/153/3/117. 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.
