  Video observations of Jupiter obtained by amateur astronomers over the past
eight years have shown five flashes of light of 1-2 s. The first three of these
events occurred on 3 June 2010, 20 August 2010, and 10 September 2012. Previous
analyses showed that they were caused by the impact of objects of 5-20 m in
diameter, depending on their density, with a released energy comparable to
superbolides on Earth of the class of the Chelyabinsk airburst. The most recent
two flashes on Jupiter were detected on 17 March 2016 and 26 May 2017 and are
analyzed here. We characterize the energy involved together with the masses and
sizes of the objects that produced these flashes. The rate of similar impacts
on Jupiter provides improved constraints on the total flux of impacts on the
planet, which can be compared to the amount of exogenic species detected in the
upper atmosphere of Jupiter. We extracted light curves of the flashes and
calculated the masses and sizes of the impacting objects. An examination of the
number of amateur observations of Jupiter as a function of time allows us to
interpret the statistics of these detections. The cumulative flux of small
objects (5-20 m or larger) that impact Jupiter is predicted to be low (10-65
impacts per year), and only a fraction of them are potentially observable from
Earth (4-25 per year in a perfect survey). More impacts will be found in the
next years, with Jupiter opposition displaced toward summer in the northern
hemisphere. Objects of this size contribute negligibly to the exogenous species
and dust in the stratosphere of Jupiter when compared with the continuous flux
from interplanetary dust punctuated by giant impacts. Flashes of a high enough
could produce an observable debris field on the planet. We estimate that a
continuous search for these impacts might find these events once every 0.4 to
2.6 years.
