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Author Topic: Fireballs, comets, meteorites, meteors and asteroids  (Read 105575 times)

Jimfarmer

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #585 on: August 04, 2018, 08:35:19 PM »
From "Air Force Shot Down Greenland Meteor"  at http://www.someonesbones.com/blog/air-force-shot-down-greenland-meteor/
" On July 25, the United States Air Force used a directed energy weapon to destroy a meteor that could have annihilated Thule Air Force Base, the US’s northernmost early warning station, says a White House source speaking under condition of anonymity. "

Yowbarb

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #586 on: August 04, 2018, 10:29:26 PM »
MadMax, Jimfarmer, thank you for your posts.

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #587 on: August 05, 2018, 07:27:06 AM »
Space object traveling Mach 74 explodes above U.S. air base, military silent

https://www.intellihub.com/space-object-traveling-mach-74-explodes-above-u-s-air-base-military-silent/

No warning was given before or after an earthbound object exploded over a U.S. air base

The military has made no announcement regarding an airborne earthbound object that exploded with 2.3 kilotons force 26 miles above U.S. Air Base Thule on July 25th around 11:55 pm.

The object was traveling 55,000 mph (15 miles/sec) or Mach 74.

Director of the Nuclear Implementation Project, Federation of American Scientists, Hans Kristensen tweeted last Wednesday: “Meteor explodes with 2.1 kilotons force 43 km above missile early warning radar at Thule Air Base”

    Meteor explodes with 2.1 kilotons force 43 km above missile early warning radar at Thule Air Base. https://t.co/qGvhRDXyfK
    HT @Casillic

    We’re still here, so they correctly concluded it was not a Russian first strike. There are nearly 2,000 nukes on alert, ready to launch. pic.twitter.com/q01oJfRUp4

    — Hans Kristensen (@nukestrat) August 1, 2018

Kristensen’s tweet was a followup to Rocket Ron Blaalke’s July 29th tweet which read: “A fireball was detected over Greenland on July 25, 2018 by US Government sensors at an altitude of 43.3 km. The energy from the explosion is estimated to be 2.1 kilotons.”

Max.
"Ignorance is Bliss" - (Agent Smith the first Matrix Movie)

MadMax

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Re: Fireballs, comets, meteorites, meteors and asteroids
« Reply #588 on: August 14, 2018, 03:07:51 PM »
Another very close call !!

Asteroid discovered after it makes the closest flyby of the year!

The space rock came sneaking up on us from behind the sun.  ??? ::)

https://www.cnet.com/news/asteroid-discovered-after-it-makes-the-closest-flyby-of-the-year/

The closest call of the year happened Friday.
NASA

A  bus-size asteroid made the closest pass by Earth so far this year, coming closer than the orbit of many communications satellites as it buzzed by on Friday.

Astronomers actually discovered the 15-meter (49-foot) asteroid 2018 PD20 on Saturday using telescopes on Hawaii's Mauna Loa, after it'd already made its closest approach to our planet.

Amateur astronomer and high school physics teacher Tony Dunn explained via Twitter that the asteroid was "undiscoverable prior to closest approach because it came from the direction of the Sun."

Ron Baalke from NASA's Jet Propulsion Laboratory shared this illustration showing 2018 PD 20 passing in front of the orbiting moon and then much closer by Earth before heading back out to the solar system.

Dunn also used an orbit simulation program to show the trajectory of the asteroid was "heavily bent by Earth's gravity:"

In the above diagram, the purple circle represents geosynchronous orbit, where many large satellites reside. The asteroid passed inside this orbit, coming within 33,210 kilometers (20,636 miles) of us.

The close call comes a few months after an asteroid named 2018 LA was spotted just hours before it actually impacted our atmosphere, and eventually became bits of meteorite that landed in Africa. That asteroid was estimated to be only 2 meters (6 feet) across. No injuries or damage were reported from the impact, though it did light up the skies briefly (We keep getting lucky don't we).

Max.
"Ignorance is Bliss" - (Agent Smith the first Matrix Movie)

 

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