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Last Updated: 18 January 2022

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Right ascension19 h 16 m 18.6100 s
Declination+46 00 18.813
Apparent magnitude (V)13.988
Spectral typeG1IV
Database references

NASA's Kepler mission discovered 11 new planetary systems hosting 26 confirmed planets. These discoveries are nearly double number of verified Kepler planets and triple number of stars known to have more than one planet that transit, or passes in front of, its host star. Such systems will help astronomers understand how planets form. Planets orbit close to their host stars and range in from 1. 5 times radius of Earth and larger than Jupiter. Fifteen of them are between Earth and Neptune in size, and further observations will be required to determine which are rocky like Earth and which have thick gaseous like Neptune. Planets orbit their host star once every six 143 days. All are closer to their host star than is to our sun. Each of newly-verified planetary systems contains two to five closely-space transiting planets. Daniel Fabrycky, Hubble Fellow at UC Santa Cruz and lead author of paper confirming four systems, construct dynamical models of how planets pull on each other gravitationally. In tightly-packed planetary systems, gravitational pull of planets among themselves causes one planet to accelerate and another planet to decelerate along its orbit, and that causes orbital period of each planet to change, Fabrycky say. By precisely timing when each planet transits its star, Kepler detects gravitational tug of planets on each other, clinching case for ten of newly announced planetary systems. Five of new systems contain pair of planets where inner planet orbits star twice during each orbit of outer planet. Four of systems contain pairing where outer planet circles star twice for every three times inner planet orbits its star. These configurations help to amplify gravitational interactions between planets, similar to how my sons kick their legs on swing at right time to go higher, said Jason Steffen, Brinson postdoctoral Fellow at Fermilab Center for Particle Astrophysics in Batavia, Ill., And lead author of another paper confirming four of systems. Kepler has identified more than 2 300 planet candidates by repeatedly measuring changes in brightness of more than 150 000 stars to detect when planet passes in front of star, casting small shadow toward Earth and Kepler spacecraft. Properties of stars clues for planet detection. Dip in brightness and duration of planet transit combine with properties of its host star present unique signature. When astronomers detect candidates that exhibit similar signatures around same star, likelihood of planet being false positive is very low. Planetary systems with transit timing variations can be verified without ground-base observations, accelerating confirmation of planet candidates. This detection technique also increases Kepler's ability to confirm planetary systems around fainter and distant stars. System With Most Planets Among These Discoveries Is Kepler-33, Star That Is Older And More Massive Than Our Sun.

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