It's suspected that about 5,000 years ago a comet 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.
This pair of Hubble Space Telescope images of comet C/2019 Y4 (ATLAS), taken on April 20 and April 23, 2020, reveal the breakup of the solid nucleus of the comet. Hubble photos identify as many as 30 separate fragments. The comet was approximately 91 million miles from Earth when the images were taken. The comet may be a broken off piece of a larger comet that swung by the Sun 5,000 years ago. The comet has been artificially colored in this view to enhance details for analysis. Credits: Science: NASA, ESA, Quanzhi Ye (UMD); Image Processing: Alyssa Pagan (STScI)
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, reports
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 Jupiter’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 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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