Here is update on the analysis of the remains of interstellar meteor IM1. There was a paper claiming the IM1 remains were coal ash but that is disproved.
There is a new 5 page pre-print paper by the Galileo Project team.
Analysis of the trajectory suggested an interstellar origin of the meteor. The object, labeled IM1 for Interstellar Meteor 1, arrived with a velocity relative to Earth of more than 45 kilometers per second and originated from outside the plane of the ecliptic. On 1 March 2022, the US Space Command issued a formal letter to NASA certifying a 99.999% likelihood that the object was interstellar in origin. Along with this letter, the US Government released the fireball light curve as measured by satellites, which showed three flares separated by a tenth of a second from each other. The bolide broke apart at an unusually low altitude of about 17 kilometers. The object was substantially stronger than any of the other 272 objects in the CNEOS catalog of fireballs compiled by NASA, including the 5%-fraction of iron meteorites from the solar system. Calculations of the fireball light energy suggest that about 500 kilograms of material was ablated by the fireball and converted into ablation spherules with a small efficiency.
Cosmic spherules are often sub-divided into three compositional types. These are the silicate-rich spherules or S-type, the Fe-rich spherules or I-type and glassy spherules or G-types. Relatively rare spherules have been called differentiated as they have similarities to achondrite meteorites and have been treated as a subgroup of S-type spherules. Differentiated spherules have major-element compositions with higher Si/Mg and Al/Si ratios, and higher refractory lithophile trace element contents relative to chondritic spherules.
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