On Saturday there was a bright fireball over the Caribbean (22.06.2019 – 21:25 UT) South of Puerto Rico.
It is especially interesting considering the different types of instruments that have observed the event. It occurred over the sea so there are no known witnesses (so far). Instead, the fireball was detected with all kinds of sensors: infrasound arrays, a lightning mapper, and even by a ground-based telescope before it entered the Earth’s atmosphere. This is actually only the fourth time an asteroid has been seen before it entered our atmosphere. In recent times we observed 2008 TC3, 2014 AA, and 2018 LA on their way to the atmosphere.
After detection the asteroid was provisional named A10eoM1 and later it received its designation 2019 MO.
First additional information about this event were posted by Peter Brown and Frankie Lucena on Twitter:
— Frankie Lucena (@frankie57pr) June 25, 2019
A post by Ernest Guido locates the impact at Latitude: 15.02° N and a Longitude of 68.65° W.
Very nice catch!! Using available obs of A10eoM1 by F52 & T08, FINDORB finds an IMPACT on June 22, 2019 at 21:31:54UT at Lat +15.02 & Long W68.65 that seems remarkably close to data shared by @pgbrown & @frankie57pr pic.twitter.com/Av8JyorE2O
— Ernesto Guido (@comets77) June 25, 2019
The fireball was detected with at least 3 infrasound stations of the IMS (International Monitoring System) and from this data we derived a source energy of the entering asteroid of around 2.5 kt TNT. This would correspond to a size of about 4.5 m in diameter.