Jupiter's third largest and longest-lived oval: Color changes and dynamics

The transition region between the North Equatorial Band (NEBn) and Tropical Zone (NTrZ) in Jupiter is home to convective storms, systems of cyclones anticyclones atmospheric waves. Zonal winds are weak but have a strong latitudinal shear allowing formation (typically dark) white) that remain close latitude. A large anticyclone formed year 2006 at planetographic latitude 19°N persists since then after complex dynamic history, being possibly third longest-lived oval planet Jupiter's Great Red Spot BA. This has experienced interactions with other ovals, merging another February 2013; it also color changes, from white red (September 2013) back an external ring (2015–2016). survived effects closely located Temperate Belt Disturbance, which occurred October 2016 fully covered oval, rendering unobservable for short time. When became visible again its expected longitude previous longitudinal track, reappeared as keeping this same morphology 2017 least until onset new disturbance August 2020. Here we describe historic evolution properties oval. We use JunoCam Hubble Space Telescope (HST) images measure size obtaining mean value (10,500 ± 1000) x (5,800 600) km2 internal rotation finding -(2 1)·10−5 s−1 relative vorticity. used HST PlanetCam-UPV/EHU multi-wavelength observations characterize changes Junocam unveil detailed structure. altitude-opacity indices show higher redder clouds than environment lower cloud tops ovals like GRS, less GRS spite dramatic environmental suffered by during all these years, main characteristics stable time therefore must be related dynamics below observable decks.