Ny interstellar komet

[BjarneModerator Super Nova]

https://en.wikipedia.org/wiki/C/2019_Q4_(Borisov)

[BjarneModerator Super Nova]

Shortly before dawn on September 13th, Julia de León, Miquel Serra-Ricart, Javier Licandro, all members of IAC’s Solar System Group, and Carlos Raúl de la Fuente Marcos, from the Complutense University of Madrid, obtained high resolution images and visible spectra of comet C/2019 Q4 (Borisov) using the OSIRIS instrument at the 10.4m GTC, installed in the Roque de los Muchachos Observatory (Garafía, La Palma). Observations were not easy, the object could only be seen at low elevation over the horizon and small angular separation from the Sun. However, thanks to the excellent atmospheric conditions of the Canarian Observatories and GTC’s expert telescope support astronomerss, these challenging observations were successfully completed.
Comet C/2019 Q4 could not have formed in our Solar System as we know it, it has to have formed around a star other than the Sun and escaped from its gravitational attraction, probably millions of years ago. Comet C/2019 Q4 is the first clearly cometary object observed in the inner Solar System, but of extrasolar origin. Carlos and Raúl de la Fuente Marcos point out that their “direct N-body simulations that use the latest orbit determination place C/2019 Q4 well beyond the sphere of influence of the Solar System only 50,000 years ago, moving inbound at a velocity nearly 500 times higher than the escape velocity from the Solar System at that distance. In this context, it is difficult to exclude an extrasolar origin for C/2019 Q4.”

For Javier Licandro, the results of this research “clearly show that comets in other planetary systems can be similar to those of the Solar System and they may have formed by processes similar to those which led to the formation of the Oort Cloud comets in the Solar System.”
http://www.iac.es/divulgacion.php?op1=16&id=1610&lang=en

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