Near-Earth objects and close calls

thorbiorn

The Living Force
FOTCM Member
It looks like that system became operational rather recently and there are some uncertainties in how reliably it can detect bolides and differentiate them from ordinary lightning.
That is true. Thinking about a way to get an idea of the size of the problem I tried to find maps showing lightning activity, even if the lightning that could be seen from space would not be ground strikes, but cloud to cloud, or better cloud to air or even space, like sprites:

The NASA information page on SEVERE WEATHER 101 > Lightning Types has this:

Cloud Flashes

There are many flashes which do not reach ground. Most of these remain within the cloud and are called intra-cloud (IC) lightning flashes. Cloud flashes sometimes have visible channels that extend out into the air around the storm (cloud-to-air or CA), but do not strike the ground. The term sheet lightning is used to describe an IC flash embedded within a cloud that lights up as a sheet of luminosity during the flash.
It seems to be easier to encounter maps of the ground strikes. Here is one from an article in IEEE Spectrum
MzM0ODExNw.png
And a Russian map that did not explain what type they counted.
lightning-strike-map2.jpg
On both of the two previous maps, the landmasses and nearby areas stand out, but I wouldn't say that is very clear at all when one takes a second look at the map with the satellite observations. If the cloud to cloud and cloud to space follow the patters of activity over land, as one might expect, then the map most be showing something.
Screenshot 2021-02-28 000636.png
Next, one could try to calculate the area covered by the satellites. Here is one map with a semblance of coordinates.
Map-Coordinates-v4.8.9-Pro.png
Comparing the two previous maps, one has an idea that most of the measurements appear to be within 180 West to 15 West longitude and then from 50 South to 50 North latitude. Next, one could ask how much of an area that would be compared to the whole Earth and also if the satellites can register the flashes in daytime or how strong they would have to be to make that possible?
 
Last edited:

unkl brws

Jedi Master
Near-Earth asteroid Apophis will have its closest sweep past Earth prior to its exceedingly close 2029 pass, on March 5-6, 2021. Why astronomers are watching, plus info here on how to view the asteroid online.

 

sToRmR1dR

The Living Force
FOTCM Member
A newly-discovered asteroid will fly by Earth on March 8, 2021.

Posted by Teo Blašković on March 7, 2021

 

unkl brws

Jedi Master
From NASA Meteor Watch (Facebook page) March 7-
Fireball over northern Vermont
Eyewitnesses in the North East and Canada are reporting seeing a bright fireball this evening around 5:38 PM Eastern Standard Time. Analysis of their reports shows that the meteor occurred over northern Vermont, first appearing at a height of 52 miles (84 kilometers) above Mount Mansfield State Forest. Moving northeast at 47,000 miles per hour (21 kilometers per second), it traversed 33 miles (53 kilometers) through the upper atmosphere before burning up 33 miles (53 kilometers) above Beach Hill in Orleans County south of Newport.
We hope to refine the trajectory as more reports and hopefully some videos filter in.
1615214316876.png
 

sToRmR1dR

The Living Force
FOTCM Member
From NASA Meteor Watch (Facebook page) March 7-
Fireball over northern Vermont
Eyewitnesses in the North East and Canada are reporting seeing a bright fireball this evening around 5:38 PM Eastern Standard Time. Analysis of their reports shows that the meteor occurred over northern Vermont, first appearing at a height of 52 miles (84 kilometers) above Mount Mansfield State Forest. Moving northeast at 47,000 miles per hour (21 kilometers per second), it traversed 33 miles (53 kilometers) through the upper atmosphere before burning up 33 miles (53 kilometers) above Beach Hill in Orleans County south of Newport.
We hope to refine the trajectory as more reports and hopefully some videos filter in.

View attachment 43495
Update:


More here:

By Rafi Letzter - Staff Writer 19 hours ago
 

Gary

The Living Force
FOTCM Member
This morning the American Meteor Society (AMS) had received 1066 reports, which makes it the most widely reported event in the UK since their modern database system began in 1980.

BBC News reports meteorites are likely north of Cheltenham and that a sonic boom had been reported.

Space.com reports:

Meteorite from brilliant UK fireball is England's first in 30 years

A chunk of the meteorite that was recovered from Winchcombe in England on March 1, 2021 — the first meteorite found in the United Kingdom since 1991.


A chunk of the meteorite that was recovered from Winchcombe in England on March 1, 2021 — the first meteorite found in the United Kingdom since 1991. (Image credit: The Trustees of the Natural History Museum, London)


A piece of the space rock that lit up skies over England on Feb. 28 has been found.

The singed hunk of asteroid was discovered in the driveway of a house in Winchcombe, a small town in the county of Gloucestershire in southwestern England. The rock, which weighs nearly 10.6 ounces (300 grams), is the first meteorite found in the UK since 1991, experts said, and the first known carbonaceous chondrite ever discovered in the country.

Carbonaceous chondrites are especially pristine and primitive meteorites that generally contain lots of organic material, including complex molecules such as amino acids. Studying carbonaceous chondrites can shed light on the early solar system and how the building blocks of life found their way to Earth, researchers say.

Such study is already under way at the Natural History Museum in London, where the meteorite now resides.

"This is really exciting. There are about 65,000 known meteorites in the entire world, and of those only 51 of them are carbonaceous chondrites that have been seen to fall like this one," Sara Russell, a meteorite scientist at the museum, said in a statement.

Rest of article here.

See also: Blazing meteor fireball observed across UK - Update: Sonic boom reported
 

ScioAgapeOmnis

The Living Force
FOTCM Member
Thought this was curious:

Something changed in 2015 where a bunch of those organizations (besides AMS) got a spike of events reported. You can't really see it from just looking at the grand totals, but it's pretty obvious when you break it out by organization. Wonder if the political climate in 2015 and onwards served as a cosmic attractor.
 

Niall

Administrator
Administrator
Moderator
FOTCM Member
Thought this was curious:

Something changed in 2015 where a bunch of those organizations (besides AMS) got a spike of events reported. You can't really see it from just looking at the grand totals, but it's pretty obvious when you break it out by organization. Wonder if the political climate in 2015 and onwards served as a cosmic attractor.
I think what that's showing is the setting up of new observation orgs in recent years (or the setting up by pre-existing orgs of reporting systems like the one the AMS has). It's still interesting data because it shows a major recent uptick in 'official' interest in meteor fireballs.
 

ScioAgapeOmnis

The Living Force
FOTCM Member
I think what that's showing is the setting up of new observation orgs in recent years (or the setting up by pre-existing orgs of reporting systems like the one the AMS has). It's still interesting data because it shows a major recent uptick in 'official' interest in meteor fireballs.
Ahh good point! I figure since there were a couple of 1’s in the preceding years that some of those organizations were around for a while. But maybe it was some beta test phase or whatever. But yeah there’s a bunch of them around now to collect data, they definitely want this data from everyone.
 

sToRmR1dR

The Living Force
FOTCM Member
A newly-discovered asteroid will flyby Earth on March 16, 2021.

Posted by Teo Blašković on March 12, 2021

 

unkl brws

Jedi Master
So...this was not a fireball, but a SpaceX launch from Cape Canaveral, Florida?! 🤔


From the AMS Facebook page -
We received about 120 reports and many photos from East Coast States (CT, DE, FL, MA, MD, ME, NC, NJ, NY, OH, PA, RI, VA, WV and Ontario) of an object observed in the sky on March 14th just after 6 AM EDT. This was not a fireball but a SpaceX Rocket. SpaceX launched the 22nd mission of the constellation of networked satellites known as Starlink that will provide satellite Internet access to millions and ruin the night sky for everybody.
 

sToRmR1dR

The Living Force
FOTCM Member
A newly discovered asteroid made a close approach to Earth on March 15, 2021.

Posted by Teo Blašković on March 16, 2021

 

Eboard10

The Living Force
FOTCM Member
And right after a meteor was sighted over Rome, another one flew across the skies of Naples and Sorrento the following day!

(Translated using DeepL).

Huge meteor in the skies of Naples and Sorrento: the enchanting images of the entrance into the atmosphere.

Yet another meteor was sighted over the skies of Rome in the evening of 15 March.

They keep on coming.
__________________________________

The sighting: a meteor illuminates Rome's night sky

Meteor illuminates the sky over the capital. The luminous body was captured by a Meteo Lazio webcam installed in the Batteria Nomentana area, to the north east of the capital. A passage of a few seconds, but it has been noticed by many citizens of Rome, the Castelli Romani and Lazio in general.

meteora-roma-638x425.jpg


At 20.57 yesterday, 15 March 2021, a very bright meteor crossed the sky over Rome. The luminous body was captured by a Meteo Lazio webcam installed in the Batteria Nomentana area, to the north east of the capital. It only passed by for a few seconds, but was noticed by many citizens of Rome, the Castelli Romani and Lazio in general. On various Facebook groups in the neighbourhoods of Rome, some people wondered about the very bright trail that lit up the night sky of the capital. The solution to the mystery, as anticipated, was published on the Meteo Lazio Facebook page (below the video posted on YouTube.

Meteor or fireball? Definitely not a meteorite​

It is a large meteor, or shooting star. Asteroids and comets are celestial bodies, but unlike meteors they do not collide with the earth. Meteors or shooting stars are consumed in the atmosphere, while meteors touch the earth's surface. A meteor is an asteroid fragment that ignites upon entering the Earth's atmosphere and is consumed before it hits the ground. The speed is between 11 and 72 kilometres per second. The head of the meteor is the progressively disintegrating meteorite, while the trail is a column of plasma visible for a few seconds. A particularly bright meteor (and perhaps this is the case) is called a bolide. As mentioned if the meteor dissolves in the air the light ceases, as in this case, but if the object survives the atmosphere it crashes to the surface and is called a 'meteorite' in this case. Striking the earth's surface can produce a meteor crater.


Translated with www.DeepL.com/Translator
 
Top Bottom