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New Orbits for Comets C/1960 M1 (Humason), C/1980 E1 (Bowell), and Musings on Extrasolar Comets

Posted by Blogweb on November 21, 2017 at 2:30 PM

Interstellar object for the First Time C/1980 E1 is a non-periodic comet discovered by Edward L. G. Bowell on 11 February 1980. C/1980 E1 is leaving the Solar System on a hyperbolic trajectory


Before entering the inner Solar System for a 1982 perihelion passage, C/1980 E1 had a barycentric (epoch 1950-Jan-01) orbit with an aphelion of 74,300 AU (1.17 light-years), and a period of approximately 7.1 million years.


. Since the epoch of 1977-Mar-04, C/1980 E1 has had a barycentric eccentricity greater than 1,[2] keeping it on a hyperbolic trajectory that will eject it from the Solar System. Objects in hyperbolic orbits have negative semimajor axis, giving them a positive orbital energy. The Minor Planet Center does not directly list a semimajor axis for this comet.[5]


By May 1995, the comet was 30 AU from the Sun on an ejection trajectory going 8.6 km/s (19,000 mph). Since February 2008, the comet has been more than 50 AU from the Sun.[6]


The production of OH (hydroxide) was observed pre-perihelion while the comet was nearly 5 AU from the Sun.[7] CN (cyanide) was not detected until the comet was near perihelion. The comet nucleus was estimated to have a radius of several kilometers. The surface crust was probably a few meters thick.


Now any comet currently more than about 150,000 AU (2 ly) from the Sun can be considered lost to the interstellar medium. The nearest known star is Proxima Centauri system triple stars. As they come into or leave the inner Solar System they may have their orbit changed by the planets, or alternatively be ejected from the Solar System

Many of these comets may come from the Oort cloud, or perhaps even have interstellar origin LIKE Comet Lulin AND `Oumuamua, maybe asteroid.


. Comet dust – Comet dust refers to cosmic dust that originates from a comet. Comet dust can provide clues to comets origin, when the Earth passes through a comet dust trail, it can produce a meteor shower. Bulk properties of the comet dust such as density as well as the composition can distinguish between the models. For example, the ratios of comet and of interstellar dust are very similar. The 1) interstellar model says that ices formed on dust grains in . cloud that preceded the Sun. The mix of ice and dust then aggregated into a comet without appreciable chemical modification, J. Mayo Greenberg first proposed this idea in 1986. In the 2) Solar System model, the ices that formed in the interstellar cloud first vaporized as part of the disk of gas. The vaporized ices later resolidified and assembled into comets, so the comets in this model would have a different composition than those comets that were made directly from interstellar ice.


TONYNETONE ). Investigating the link between cometary and interstellar material.


Proxima Centauri as seen by TONYNETONE


Proxima Centauri (from Latin, meaning 'nearest [star] of Centaurus', or Alpha Centauri C, is a red dwarf, a small low-mass star.

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