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Bonilla's comet
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Mexican astronomers have suggested that a comet may have split into several pieces around 1883 and that Earth barely avoided multiple Tunguska events or even a mass extinction. On August 12-13th of 1883, Mexican astronomer Josť Bonilla observed 447 bodies cross the solar disc, from an observatory in Zacatecas. These objects were estimated to have had a size of between 46 and 1022 meters, and to have passed only 538 to 8062 km from the Earth. But the source of these objects could also have been an unknown comet or comet C/1883 D1 (Brooks-Swift). The event also coincided with the annual Perseids meteor shower. Even migrating birds can not be ruled out.
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RE: 1883 fragmented Comet
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First UFO photograph could be a massive comet

A photograph taken in 1883 was heralded as the first photographic evidence of UFOs.
But now scientists believe it could be a massive comet that came close to hitting the earth with the same force as that which killed the dinosaurs, the Daily Mail reported.
Mexican astronomer Jose Banilla took the image, which appears to show something passing in front of the moon, on August 12 1883.

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Title: Interpretation of the observations made in 1883 in Zacatecas (Mexico): A fragmented Comet that nearly hits the Earth
Authors: Hector Javier Durand Manterola, Maria de la Paz Ramos Lara, Guadalupe Cordero

In 1883, on the 12th and 13th of August, Mexican astronomer Jose A. y Bonilla observed several objects passing in front of the solar disk. In 1886 in the L'Astronomie magazine, he reported his observations without providing a hypothesis explaining the registered phenomena. Our objective in this work is to interpret, with current knowledge, what he observed in Zacatecas. Our working hypothesis is that what Bonilla observed in 1883 was a highly fragmented comet, in an approach almost flush to the Earth's surface. The fragmentation of the comet's nucleus is a phenomenon known since the XIX century. Using the results reported by Bonilla, we can estimate the distance at which the objects approach to the Earth's surface, their size, their mass and total mass of the comet before fragmentation. According to our calculations, the distance at which the objects passed over the Earth's surface, was between 538 km and 8,062 km, the width of the objects was between 46 m and 795 m and its length between 68 m and 1,022 m, the object's mass was between 5.58e8 kg and 2.5e12 kg. Finally, the mass of the original comet, before fragmentation, was between 1.83e12 and 8.19e15 kg, i.e., between 2e-3 and 8.19 times the mass of Halley Comet.

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