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We present the jet kinematics of the flat spectrum radio quasar (FSRQ) 4C+21.35 using time-resolved KaVA very long baseline interferometry array radiomaps obtained from September 2014 to July 2016. During two out of threeobserving campaigns, observations were performed bi-weekly at 22 and 43 GHzquasi-simultaneously. At 22 GHz, we identified three jet components near thecore with apparent speeds up to (14.4+/-2.1)c. The timing of the ejection of anew component detected in 2016 is consistent with a gamma-ray flare in November2014. At 43 GHz, we found four inner jet (<3 mas) components with speeds from(3.5+/-1.4)c to (6.8+/-1.5)c. Jet component speeds tend to be higher withincreasing distances from the core. We compared our data with archival VeryLong Baseline Array (VLBA) data from the Boston University (BU) 43 GHz and theMonitoring Of Jets in Active galactic nuclei with VLBA Experiments (MOJAVE)15.4 GHz monitoring programs. Whereas MOJAVE data and our data are in goodagreement, jet speeds obtained from the BU Program data in the same time periodare about twice as high as the ones we obtain from the KaVA data. Thediscrepancy at 43 GHz indicates that radio arrays with different angularresolution identify and trace different jet features even when the data areobtained at the same frequency and at the same time. The flux densities of jetcomponents decay exponentially, in agreement with a synchrotron cooling timescale of about 1 year. Using known electron Lorentz factor values (about9,000), we estimate the magnetic field strength to be around 1-3 micro-Tesla.When adopting a jet viewing angle of 5 degrees, the intrinsic jet speed is oforder 0.99c.

Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array