07:21 GMT11 April 2021
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    The object’s mass and size was estimated by NASA Meteor Watch at about 4.5 kilograms and 15 centimeters in diameter, respectively.

    A fireball spotted by numerous eyewitnesses above Vermont on 8 March was travelling at a speed of about 19 kilometers per second, according to NASA Meteor Watch.

    In a Facebook post, the group argues that the fireball was likely a fragment of an asteroid, that fragmented in the atmosphere when "the pressure difference between front and back exceeded its structural strength".

    Having procured "infrasound measurements from 3 nearby stations", the group states that "the amplitudes and durations of the signals put the energy of the fireball fragmentation at 440 pounds (200 kilograms) of TNT".

    ​Based on these calculations, NASA Meteor Watch also managed to estimate the mass and size of the object: 10 pounds (4.5 kilograms) and 6 inches (15 centimeters) in diameter, respectively.

    estimates, fireball, Vermont, US
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