Rochester: A close call of 0.8 light years

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Doum
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Rochester: A close call of 0.8 light years

Post by Doum » Tue Feb 17, 2015 8:15 pm

A group of astronomers from the US, Europe, Chile and South Africa have determined that 70,000 years ago a recently discovered dim star is likely to have passed through the solar system's distant cloud of comets, the Oort Cloud.

http://phys.org/news/2015-02-years.html

Could that explain the anomaly that bring the possibilty of a planet x and y or z that are suppose to affect orbit of far dwarf planet?

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Rochester: A Close Call of 0.8 Light Years

Post by bystander » Tue Feb 17, 2015 10:47 pm

A Close Call of 0.8 Light Years
University of Rochester | 2015 Feb 17

Astronomers identify the closest known flyby of a star to our solar system: a dim star that passed through the Oort Cloud 70,000 years ago

A group of astronomers from the US, Europe, Chile and South Africa have determined that 70,000 years ago a recently discovered dim star is likely to have passed through the solar system’s distant cloud of comets, the Oort Cloud. No other star is known to have ever approached our solar system this close – five times closer than the current closest star, Proxima Centauri. ...

The star’s trajectory suggests that 70,000 years ago it passed roughly 52,000 astronomical units away (or about 0.8 light years, which equals 8 trillion kilometers, or 5 trillion miles). This is astronomically close; our closest neighbor star Proxima Centauri is 4.2 light years distant. In fact, the astronomers explain in the paper that they are 98% certain that it went through what is known as the “outer Oort Cloud” – a region at the edge of the solar system filled with trillions of comets a mile or more across that are thought to give rise to long-period comets orbiting the Sun after their orbits are perturbed.

The star originally caught Mamajek’s attention during a discussion with co-author Valentin D. Ivanov, from the European Southern Observatory. Scholz’s star had an unusual mix of characteristics: despite being fairly close (“only” 20 light years away), it showed very slow tangential motion, that is, motion across the sky. The radial velocity measurements taken by Ivanov and collaborators, however, showed the star moving almost directly away from the solar system at considerable speed. ...

Star buzzed Solar System during human prehistory
Nature News | 2015 Feb 18

The Closest Known Flyby of a Star to the Solar System - Eric E. Mamajek et al
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FECYT: A Star Disturbed the Solar System's Comets in Prehistory

Post by bystander » Wed Mar 21, 2018 3:04 pm

A Star Disturbed the Solar System's Comets in Prehistory
Spanish Foundation for Science & Technology (FECYT) | Information and Scientific News Service (SINC) | 2018 Mar 20

New evidences of the passage of the Scholz´s star

About 70,000 years ago, when the human species was already on Earth, a small reddish star approached our solar system and gravitationally disturbed comets and asteroids. Astronomers from the Complutense University of Madrid and the University of Cambridge have verified that the movement of some of these objects is still marked by that stellar encounter.

At a time when modern humans were beginning to leave Africa and the Neanderthals were living on our planet, Scholz’s star -- named after the German astronomer who discovered it -- approached less than a light-year from the Sun. Nowadays it is almost 20 light-years away, but 70,000 years ago it entered the Oort cloud, a reservoir of trans-Neptunian objects located at the confines of the solar system.

This discovery was made public in 2015 by a team of astronomers led by Professor Eric Mamajek of the University of Rochester (USA). The details of that stellar flyby, the closest documented so far, were presented in The Astrophysical Journal Letters.

Now two astronomers from the Complutense University of Madrid, the brothers Carlos and Raúl de la Fuente Marcos, together with the researcher Sverre J. Aarseth of the University of Cambridge (United Kingdom), have analyzed for the first time the nearly 340 objects of the solar system with hyperbolic orbits (very open V-shaped, not the typical elliptical), and in doing so they have detected that the trajectory of some of them is influenced by the passage of Scholz´s star.

Where the Solar System Meets the Solar Neighbourhood: Patterns in the Distribution of
Radiants of Observed Hyperbolic Minor Bodies
- C. de la Fuente Marcos, R. de la Fuente Marcos, S. J. Aarseth
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Re: FECYT: A Star Disturbed the Solar System's Comets in Prehistory

Post by neufer » Thu Mar 22, 2018 3:05 am


https://en.wikipedia.org/wiki/Scholz%27s_star wrote:
At closest approach [Scholz's Star] would have
had an apparent magnitude of about 11.4
.
:arrow: John Banner as Schultz with Bob Crane as Colonel Hogan.
Art Neuendorffer

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Re: FECYT: A Star Disturbed the Solar System's Comets in Prehistory

Post by Fred the Cat » Thu Mar 22, 2018 11:44 am

neufer wrote: Thu Mar 22, 2018 3:05 am

https://en.wikipedia.org/wiki/Scholz%27s_star wrote:
At closest approach [Scholz's Star] would have
had an apparent magnitude of about 11.4
.
:arrow: John Banner as Schultz with Bob Crane as Colonel Hogan.
As he typically stated, " I see nothing!" :wink:
Freddy's Felicity "Only ascertain as a cat box survivor"

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NASA: A Passing Star: Our Sun's Near Miss

Post by bystander » Mon Mar 04, 2019 6:03 pm

A Passing Star: Our Sun's Near Miss
NASA | Exoplanet Exploration | 2019 Feb 26

Stars jostling around the galaxy aren’t quite like a cosmic game of pool. But they do have occasional near misses as they speed past each other. Back when spears and stone points were the height of human technology, astronomers say, our solar system had a close encounter of the interstellar kind.

The brief visitor was Scholz’s star, and it might have grazed the outer edge of the solar system’s distant Oort Cloud about 70,000 years ago – carrying its companion, a likely brown dwarf, along for the ride.

It’s unclear whether the near miss was close enough to give objects in the Oort Cloud, our solar system’s halo of dormant comets, a gravitational nudge to fall toward the Sun. But the interstellar trespasser highlights a sometimes-forgotten reality: On long time scales, stars seem to fly around like sparks from a campfire, occasionally coming close enough to disturb each other’s cometary clouds.

Such close passes could have profound implications for exoplanets – planets orbiting other stars – and how they got where they are. At least some of the time, an interloper could become a thief, stripping a star of one or more planets – or vice versa.

Our solar system, too, might have been shaped and sculpted by stellar flybys. ...
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
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Re: Rochester: A close call of 0.8 light years

Post by neufer » Mon Mar 04, 2019 6:34 pm

One should note that any Oort Cloud body (out around 52,000 AU) whose angular momentum was sapped by Scholz’s star enough to threaten the Earth would still take around two million years to fall in towards us. So the consequences of this ~70,000 BCE encounter are still far in the future.
Art Neuendorffer

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