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billpeters

Five large asteroids skimmed Earth today

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Posted (edited)

Five large asteroids skimmed Earth today. The closest, asteroid 2019-OK, just discovered in the last 36 hours is 250 feet wide and missed us by just 45,000 miles, 0.2 the distance to the Moon. This early evening Arizona time it will have reached magnitude 9.4, which I can spot with my high powered binoculars. A thee inch telescope would work also to see it. Unfortunately, it is poorly timed and placed to observe before it fades. Please note that it is moving very quickly and seven hours later the magnitude has dropped to an impossible +46 as most of the dark side faces Earth, about as bright as a pen light sitting on the Moon. Not even Hubble would have a good shot at that. 

An impact of an object that size would have made a crater about 1.25 miles across and wiped out most life in an area the size of Connecticut.  At that distance 1/144 objects will impact the Earth. For objects that come closer than the Moon the impact ratio is 1/3600. 

Asteroid 2019-OD, discovered a few weeks ago, came 0.9 lunar distance from Earth today.  It is almost identical in size at 237 feet wide. It was best visible last evening in the southern hemisphere at magnitude 12.79, 6 inch telescope range.

Asteroid 2015-HM10, discovered 4 years ago also is nearly the same size at 225 feet wide, but safely missed us by 12.2 lunar distance, about 2.9 million miles. Asteroid 2019-OE, at 2.5 lunar distance about 600,000 miles away, is 100 feet across. An impact from this one would be much larger than Chelyabinsk, but smaller than Meteor Crater. Both of these asteroids would have been too dim to be seen at magnitude +17.5.

Heads up. You can learn about and see some of the larger Near Earth Asteroids NEO's which pass closer than 20 LD at http://www.spaceweather.com/  Click the Ephemeris tab, enter your home observing coordinates, date, and duration to generate where they may be seen in the sky.

Tomorrow,  the even bigger Asteroid 2010-PK9 at 500+ feet will miss us by 8.2 LD.  Asteroid 2010-PK9 is a rare Aten class asteroid whose orbit brings it much closer to the Sun. In this case half as close as Mercury in a 205 day highly elliptical orbit.  About two dozen more NEO's are listed in the next couple of months with more discovered and updated daily. 

You realize that only about 10%~ of these relatively small and very close NEO's are even observed as they pass by.

Ignorance is bliss!

Cheers!

billpeters

Edited by billpeters
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Well, that explains why I have lead such a blissful life!  Thanks for the posting.  Where is it Bill that you found all of this information?  Never too late in life for me to avoid getting hit on the head!

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We've been pretty lucky do far..One of these days...

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14 hours ago, billpeters said:

Five large asteroids skimmed Earth today. The closest, asteroid 2019-OK, just discovered in the last 36 hours is 250 feet wide and missed us by just 45,000 miles, 0.2 the distance to the Moon. This early evening Arizona time it will have reached magnitude 9.4, which I can spot with my high powered binoculars. A thee inch telescope would work also to see it. Unfortunately, it is poorly timed and placed to observe before it fades. Please note that it is moving very quickly and seven hours later the magnitude has dropped to an impossible +46 as most of the dark side faces Earth, about as bright as a pen light sitting on the Moon. Not even Hubble would have a good shot at that. 

An impact of an object that size would have made a crater about 1.25 miles across and wiped out most life in an area the size of Connecticut.  At that distance 1/144 objects will impact the Earth. For objects that come closer than the Moon the impact ratio is 1/3600. 

Asteroid 2019-OD, discovered a few weeks ago, came 0.9 lunar distance from Earth today.  It is almost identical in size at 237 feet wide. It was best visible last evening in the southern hemisphere at magnitude 12.79, 6 inch telescope range.

Asteroid 2015-HM10, discovered 4 years ago also is nearly the same size at 225 feet wide, but safely missed us by 12.2 lunar distance, about 2.9 million miles. Asteroid 2019-OE, at 2.5 lunar distance about 600,000 miles away, is 100 feet across. An impact from this one would be much larger than Chelyabinsk, but smaller than Meteor Crater. Both of these asteroids would have been too dim to be seen at magnitude +17.5.

Heads up. You can learn about and see some of the larger Near Earth Asteroids NEO's which pass closer than 20 LD at http://www.spaceweather.com/  Click the Ephemeris tab, enter your home observing coordinates, date, and duration to generate where they may be seen in the sky.

Tomorrow,  the even bigger Asteroid 2010-PK9 at 500+ feet will miss us by 8.2 LD.  Asteroid 2010-PK9 is a rare Aten class asteroid whose orbit brings it much closer to the Sun. In this case half as close as Mercury in a 205 day highly elliptical orbit.  About two dozen more NEO's are listed in the next couple of months with more discovered and updated daily. 

You realize that only about 10%~ of these relatively small and very close NEO's are even observed as they pass by.

Ignorance is bliss!

Cheers!

billpeters

As long as it's only Connecticut . . . :miner:

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Posted (edited)

Connecticut got hit the same day the rest passed us by!  I nailed it!

Connecticut is a meteorite magnet. Two houses in Wethersfield, CT got hit by meteorites 11 years apart in 1971 and 1982.  Guess what, they're back.

The July 24, 2019 event has 700 reports already at amsmeters.org and growing with 37 reports of hearing the sonic booms in low atmosphere, a sure sign that rocks landed. 

It's time for a rock hunt.

Copy video link below in browser to view:

Cheers,

billpeters

https://nypost.com/2019/07/25/stargazers-wowed-by-east-coast-meteor/

ZENITH NEWS - Stargazers wowed by East Coast meteor

Edited by billpeters
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2 hours ago, billpeters said:

Connecticut got hit the same day the rest passed us by!  I nailed it!

Connecticut is a meteorite magnet. Two houses in Wethersfield, CT got hit by meteorites 11 years apart in 1971 and 1982.  Guess what, they're back.

The July 24, 2019 event has 700 reports already at amsmeters.org and growing with 37 reports of hearing the sonic booms in low atmosphere, a sure sign that rocks landed. 

It's time for a rock hunt.

Copy video link below in browser to view:

Cheers,

billpeters

https://nypost.com/2019/07/25/stargazers-wowed-by-east-coast-meteor/

ZENITH NEWS - Stargazers wowed by East Coast meteor

I was just kidding about Connecticut but maybe a hardhat's not such a bad idea after all!

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Posted (edited)

Final massive 900 foot NEO Asteroid 2019-OT discovered two days after July 24th is a potential major killer. Asteroid 2019-OT came 17.3 lunar distance from us, about 4 million miles, and reached greatest brightness on July 24 two days after its discovery. Asteroid 2019-OT would have made an initial crater 1 mile deep and 4.5 miles wide with a blast zone 200 miles across. It it hit in the ocean it would have displaced fifty times more volume of water creating the largest tsunami ever seen. 

One final parting NEO discovered, having zipped by us the night of the 24/25th, is Asteroid 2019-OL. At 90 feet across it missed us by 1.2 million miles, 5.1 LD.

You realize that most of these near Earth grazers were discovered just before or after they had passed us. The year part of their names tells the year of discovery, usually discovered just before or after they pass us.  Ninety percent of those over 100 feet across are never seen. Very few under 100 feet across, maybe two to three percent, are listed even though the vast majority of daily Earth grazers flying overhead are between 10 and 100 feet across. 

Ignorance is bliss!

Cheers!

billpeters

 

 

Edited by billpeters

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1 hour ago, billpeters said:

You realize that most of these near Earth grazers were discovered just before or after they had passed us

Thats the scary part  !  How fast are these things cruising ?  I`m guessing that a million miles can be traveled in short order ...Bet we are overdue for an impact

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