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Author Topic: Fireballs, comets, meteorites, meteors and asteroids  (Read 204878 times)

Yowbarb

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #735 on: November 25, 2019, 11:37:00 PM »
Interesting to note from the table that Barb linked, under the column "potential impacts" that the same asteroid could make multiple strikes.  I had always assumed that once one hit an orb, it remained there permanently.

RR interesting point, one which I hope we all never have to find out the answer to to, directly...
Yikes, also, as I had never thought about one asteroid making multiple hits.  Would it be like, when we were children and skipped those rocks across water ?

ilinda, I think you are probably right about that...

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #736 on: November 26, 2019, 02:45:57 PM »
Quote
MadMax, although so far, these frightening, recently-discovered asteroids do not end up hitting earth, one thing is, there seems to be more close ones that were JUST DISCOVERED. (This seems sort of new, doesn't it?)- Barb

Good point Barb!

0.5 LD... 35M!  ???  :-[

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #737 on: November 26, 2019, 03:06:22 PM »
The are concerned about SOMETHING,, wonder what ??  ???

Russian space agency plans to place telescopes on Moon to track dangerous asteroids
The system will track potentially dangerous objects against the Sun’s background and in deep space


https://tass.com/science/1092363

MOSCOW, November 25. /TASS/. Russia’s State Space Corporation Roscosmos plans to place telescopes on its future lunar base in the southern pole of the Earth’s natural satellite to monitor dangerous asteroids and comets, Roscosmos Executive Director for Science and Long-Term Programs Alexander Bloshenko told TASS on Monday.

The telescopes on the Moon together with the satellites at the Lagrangian points of the Sun-Earth system are set to make up the global system of monitoring asteroid and comet dangers. The system will track potentially dangerous objects against the Sun’s background and in deep space, the scientist said.

In 2016, Russia set up its automated system of warning about dangerous situations in near-Earth space. It embraces optical-electronic stations on the territory of Russia and outside it: in Armenia and Brazil. Today this system basically monitors objects in near-the-Earth space, particularly tracking space debris and ensuring the safety of satellites’ movement.

Yowbarb

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #738 on: November 27, 2019, 08:54:27 PM »
Quote
MadMax, although so far, these frightening, recently-discovered asteroids do not end up hitting earth, one thing is, there seems to be more close ones that were JUST DISCOVERED. (This seems sort of new, doesn't it?)- Barb

Good point Barb!

0.5 LD... 35M!  ???  :-[

Excellent post MadMax! I hadn't seen this one until you posted it. So this one on the 23rd, 0.5 LDs was not even posted a short while ago. Actually it was only the 24th when i had posted the upcoming close approaches see Reply #732 on: November 24, 2019  Image below is what I had posted on the 24th and lo and behold there was no 2019 WG2 listed!!
That is the one Max posted in his Reply #736

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #739 on: November 29, 2019, 04:51:43 AM »
Will Mysterious “Yarkovsky Effect” Send WORMWOOD Crashing Into Earth In 2029?


https://www.skywatchtv.com/2019/11/28/will-mysterious-yarkovsky-effect-send-wormwood-crashing-into-earth-in-2029/

Knowing how these so-called Near-Earth Asteroids (NEAs) behave could one day save our planet from a devastating impact. But a peculiar cosmic phenomenon known as the Yarkovsky effect renders some of NASA’s asteroid tracking efforts futile. Thanks to the Yarkovsky effect, NASA scientist Steve Chesley said there are thousands of asteroids that could potentially change their orbit. The NASA scientist said: “When an asteroid is first discovered, we really don’t know even which way the asteroid is being pushed. It could be pushed ahead or behind its orbit. “That can be a very complicating effect on the Earth hazard prediction for many asteroids. Now we have on the order of 100 near-Earth asteroids for which we can see and estimate the amount of Yarkovsky effect but there’s still 20,000 more near-Earth asteroids for which we have no insight of what the Yarkovsky effect is doing to that body.” The Yarkovsky effect is a cosmic force acting on bodies like asteroids and comets that can change their trajectory over time…

Yowbarb

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #740 on: November 30, 2019, 04:12:00 PM »
MadMax interesting post...

Yowbarb

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #741 on: November 30, 2019, 04:14:11 PM »
Marshall sent this:

Interesting rogue coming our way.  This is a REAL story.  It will be big and for many a sign.

Qapla', Marshall

https://www.sciencealert.com/stunning-pic-of-first-detected-interstellar-comet-reveals-a-pale-ghost-headed-our-way
...Astronomers Reveal Stunning New Image of The Interstellar Comet Coming Towards Us
Peter Dockrill 27 Nov  2019

We spotted it in August: a mysterious object shooting through our Solar System on a strange, hyperbolic trajectory implying that, whatever this thing was, it wasn't from around here.

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #742 on: December 03, 2019, 04:02:51 PM »
This one JUST discovered ..

Asteroid High-Speed 'Space Pyramid': Enormous Asteroid Hurls Towards Earth

https://sputniknews.com/science/201912031077474005-high-speed-space-pyramid-enormous-asteroid-hurls-towards-earth/

It seems that Earth is about to receive an interstellar visitor this week, as a gigantic asteroid whose size might rival that of Egyptian pyramids heads towards our planet at a speed of about 27,000 kilometers per hour.

First spotted by NASA on 27 November, the massive space object is expected to pass by our planet on 6 December, at a distance of roughly 5.4 million kilometers.

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #743 on: December 05, 2019, 04:00:30 PM »
This one “Just Discovered” …

ANOTHER large asteroid, discovered last week, to make Earth fly-by on Friday

https://www.sott.net/article/425080-ANOTHER-large-asteroid-discovered-last-week-to-make-Earth-fly-by-on-Friday

An asteroid as big as the Egyptian pyramids is zooming towards Earth and will squeeze past us on Friday - if it doesn't smash on to our home planet's surface. Named 2019 WR3, NASA expects the space rock to make a "close approach" to Earth later this week.

The space agency has classified the asteroid as a "near-Earth object (NEO)" which means its orbit brings it very close - in cosmic terms - to Earth.

The asteroid was first spotted late last week.

NASA has now observed the asteroid some 74 times to better get a sense of its size and trajectory.

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #744 on: December 05, 2019, 04:48:19 PM »
PX Moon ..??

Humans Have Good Reason to Fear Comets, Asteroids and Other Massive Space Objects Like Mini-Moons… Because Earth Has just Been Hit by One!!

https://strangesounds.org/2019/12/mini-moons-asteroid-impacts-earth-australia-science-space-astronomy.html


Now we’d like to add ‘mini-moons’ to the list of heavenly bodies we should be worried about.
Scientists have claimed our planet was recently hit by one of these mysterious rocks, which exploded in a gigantic fireball.

A mini-moon is an object which becomes entangled in Earth’s orbit as it’s zooming through space.

It will either whirl around the planet harmlessly forever, zoom off back off on its journey through the solar system or, in the worst case, smash into our planet.

‘Objects gravitationally captured by the Earth-Moon system are commonly called temporarily captured orbiters (TCO), natural Earth satellites, or minimoons,‘ scientists wrote in a new study published in The Astromomical Journal.

‘TCOs are a crucially important subpopulation of near-Earth objects (NEOs) to understand because they are the easiest targets for future sample-return, redirection, or asteroid mining missions.

Only one TCO has ever been observed telescopically, 2006 RH 120, and it orbited Earth for about 11 months.‘

However, it’s believed that an ‘extremely slow fireball’ which exploded over South Australia may have been a mini-moon.

It was picked up by six different detectors when it went kaboom in August 2016. No-one was hurt in the incident, but it shows that the movement of objects through the region of space close to Earth is highly unpredictable.

If the rock had been larger, it could have done some major damage.


R.R. Book

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #745 on: December 06, 2019, 12:34:22 PM »
Per last night's edition of Marfoogle News, a caller named Eugene Martinez from Tulare, California shared his front door camera's capture of what he believes to be yet another falling moon on Wednesday night.

Topic begins @ around 1:25:00

The security cam took several short clips in sequence, of which I've made and posted .gif files.  In the first clip posted on the man's own Youtube channel, we see the illuminated object hovering at the top of the screen, slightly left of center.



In the next clip, we see the "moon" fall rapidly from the sky, at which point anyone casually looking up might have thought it was a large fireball, not having seen it "stationary" in the sky previously.



The object appeared to me to be in an odd quarter moon phase: not in the shape of a sliver, but rather looking like a quarter sphere or wedge shape.

Martiinez noted that the energy field of the de-orbiting moon forced all the unlit lights on in his neighborhood.
« Last Edit: December 06, 2019, 05:57:40 PM by R.R. Book »

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #746 on: December 15, 2019, 03:30:27 PM »
Near-Earth asteroid numbers grow

https://www.sott.net/article/425448-Near-Earth-asteroid-numbers-grow


On December 20 a 300-metre-wide rock known as (216258) 2006 WH1 will whizz by. Six days later, (310442) 2000 CH59 - a bit bigger, at 400 metres - will do the same.

Since records began, the ESA reports, only 14 asteroids have got that close, or closer. And four of those actually hit the ground.

This year astronomers discovered a new object that might do the same thing - but with rather more serious consequences. Asteroid 2019 WW4 has moved into the Near-Earth Object Risk List with a bullet.

The object is a hefty 400 metres in diameter and might whack into us in the year 2055. However, the ESA calculates the probability of this happening as "very low".

All up, 2019 has been a bumper year for asteroid-spotters. ESA reports that sky-gazers found the largest haul of new objects ever - recording 2144 since New Year's Day, 175 of them in November alone.

That number is sure to grow in the last couple of weeks of the year, pushing the overall total even higher.


MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #747 on: December 19, 2019, 04:40:56 PM »
2017 meteor over Australia was a rare 'grazing fireball'

https://www.sott.net/article/425850-2017-meteor-over-Australia-was-a-rare-grazing-fireball

A team of researchers at Curtin University in Australia reports that a meteor that streaked across the Australian sky back in 2017 was a rare "grazing fireball." The group has written a paper describing their observations and findings and have posted it on the arXiv preprint server.

Back in 2017, a meteor tore through the atmosphere over Australia. It was notable for its duration — it lasted for approximately a minute and a half. In this new effort, the researchers have found that the object was a meteor for just a short period of time — it never struck the Earth. Instead, the object headed back out into space. Such meteors are known as grazing fireballs because they only graze the Earth's atmosphere rather than plunge through it. This is possible due to the angle at which it approaches. Like a rock that skips off the surface of a lake rather than plunging in, a meteoroid can skip off the atmosphere if its angle is very small.

The researchers report that the 2017 grazing fireball traveled across the sky at approximately 35,000 miles per hour and lit up the sky for approximately 808 miles — and slowed by approximately 0.9 miles per hour during its time in our atmosphere. It also reached a minimum height of just 58.5 kilometers

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #748 on: December 20, 2019, 03:44:37 PM »
0.4 LD ….Tick, Tock, Tick ..  ???

Yowbarb

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #749 on: December 21, 2019, 07:48:56 AM »
0.4 LD ….Tick, Tock, Tick ..  ???

Max, yes indeed!
I noticed that, AFTER it went by!

 

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