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EI2GYB > ASTRO    28.08.21 12:26l 91 Lines 4158 Bytes #999 (0) @ WW
BID : 13815_EI2GYB
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Subj: Comet ATLAS may have been a blast from the past
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Comet ATLAS may have been a blast from the past


It's suspected that about 5,000 years ago a comet may swept within 
23 million miles of the Sun, closer than the innermost planet Mercury. 
The comet might have been a spectacular sight to civilizations across 
Eurasia and North Africa at the end of the Stone Age.

However, this nameless space visitor is not recorded in any known 
historical account. 
So how do astronomers know that there was such an interplanetary intruder?

Enter comet ATLAS (C/2019 Y4), which first appeared near the beginning of 2020.

Comet ATLAS, first detected by the Asteroid Terrestrial-impact Last 
Alert System (ATLAS), operated by the University of Hawaii, quickly met 
an untimely death in mid-2020 when it disintegrated into a cascade of 
small icy pieces.

In a new study using observations from NASA's Hubble Space Telescope, 
astronomer Quanzhi Ye of the University of Maryland in College Park, r
eports that ATLAS is a broken-off piece of that ancient visitor 
from 5,000 years ago.
 Why? Because ATLAS follows the same orbital "railroad track" as that 
of a comet seen in 1844. 
This means the two comets are probably siblings from a parent comet 
that broke apart many centuries earlier. The link between the two 
comets was first noted by amateur astronomer Maik Meyer.

Such comet families are common. 
The most dramatic visual example was in 1994 when the doomed 
comet Shoemaker-Levy 9 (SL9) was pulled into a string of pieces by J
upiter's gravitational pull. This "comet train" was short-lived. 
It fell piece by piece into Jupiter in July 1994.

But comet ATLAS is just "weird," says Ye, who observed it with Hubble 
about the time of the breakup. 
Unlike its hypothesized parent comet, ATLAS disintegrated while it 
was farther from the Sun than Earth, at a distance of over 100 million miles. 
This was much farther than the distance where its parent passed the Sun. 
"This emphasizes its strangeness," said Ye.

"If it broke up this far from the Sun, how did it survive the last 
passage around the Sun 5,000 years ago? This is the big question," said Ye. 
"It's very unusual because we wouldn't expect it. 
This is the first time a long-period comet family member was seen 
breaking up before passing closer to the Sun."

Observing the breakup of the fragments offers clues to how the 
parent comet was put together. 
The conventional wisdom is that comets are fragile agglomerations of 
dust and ice. And, they may be lumpy, like raisin pudding.

In a new paper published in the Astronomical Journal, after one year 
of analysis Ye and co-investigators report that one fragment of ATLAS
disintegrated in a matter of days, while another piece lasted for weeks. 
"This tells us that part of the nucleus was stronger than the other part," 
he said.

One possibility is that streamers of ejected material may have spun 
up the comet so fast that centrifugal forces tore it apart. 
An alternative explanation is that it has so-called super-volatile 
ices that just blew the piece apart like an exploding aerial 
firework. 
"It is complicated because we start to see these hierarchies and 
evolution of comet fragmentation. Comet ATLAS's behavior is interesting 
but hard to explain."

Comet ATLAS's surviving sibling won't return until the 50th century. 




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