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Sat, 23 Oct 2021
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With quake ruled out, San Diego's 'mystery boom' was likely sonic

San Diego boom
© Fox5
A day after a "mystery boom" shook San Diego County, the strange sensation remains talk of the town — but so far there's still no clear explanation for the phenomenon.

From the South Bay through the city of San Diego and in to North County, residents reported a loud "boom" accompanied by the rattling of windows around 8:15 p.m. Tuesday.

Monitors didn't record any sort of significant earthquake in the region at that time, leaving a single educated guess, geologist Pat Abbott, a professor at San Diego State, told FOX 5.

"If the sound didn't emanate from underground there's only one more place to look and that's up above," Abbott told FOX 5, referring to a sonic boom. "Some aircraft ... something traveling at a rate faster than sound, oriented in the right direction."

While officials at Camp Pendleton have warned that artillery exercises may be heard in parts of San Diego this week, the sensation appeared to emanate from farther south, based on reports from residents. A military spokesperson added that aircraft they had over San Diego at the time are not capable of supersonic flight.

Fireball 2

Bolide over the Mediterranean Sea (June 13)

This bright meteor was recorded form Spain on 2021 June 13 at 3:45 local time (equivalent to 1:45 universal time). It overflew the Mediterranean Sea. The bolide was generated by a rock from a comet that hit the atmosphere at about 145,000 km/h. It began at an altitude of about 106 km over the Mediterranean Sea, and ended at a height of around 70 km after traveling about 38 km in the Earth's atmosphere.

The event was recorded in the framework of the SMART project, operated by the Southwestern Europe Meteor Network (SWEMN), from the meteor-observing stations located at La Hita (Toledo), Calar Alto (Almería), Sierra Nevada (Granada), La Sagra (Granada), and Sevilla.

Fireball 2

Daytime meteor fireball over Rosario, Argentina

A camera from the Rosario Meteorological and Climate Monitoring Center captured the exact moment when the object crossed to the southeast.

(Translated by google)

Comet 2

New Comet C/2021 K2 (MASTER)

CBET 4975 & MPEC 2021-L89, issued on 2021, June 09, announce the discovery of a new comet (magnitude ~19.0) on CCD images taken on May 23.0 UT with the "Mobile Astronomical System of the Telescope-Robots" (MASTER) auto-detection system (double 0.40-m f/2.5 reflector) at the South African Astronomical Observatory. The object was reported by MASTER as a new NEO candidate and has been found to show cometary activity by CCD astrometrists elsewhere. The new comet has been designated C/2021 K2 (MASTER).

Stacking of 35 unfiltered exposures, 120 seconds each, obtained remotely on 2021, June 02.4 from X02 (Telescope Live, Chile) through a 0.61-m f/6.5 astrograph + CCD, shows that this object is a comet with a compact coma about 15" arcsecond in diameter elongated toward PA 180 (Observers E. Guido, M. Rocchetto, E. Bryssinck, M. Fulle, G. Milani, C. Nassef, G. Savini, A. Valvasori).

Our confirmation images (click on the images for a bigger version; made with TYCHO software by D. Parrott)

Comet C/2021 K2 (MASTER)
© Remanzacco Blogspot

Fireball 5

Meteor fireball over the south of Spain (June 9)

On 9 June 2021, at about 5:09h local time (3:09 universal time), a fireball was spotted over Spain. This bolide was generated by a rock from a comet that hit the atmosphere at about 155,000 km/h. The fireball, that could be seen over the whole Iberian Peninsula because of its luminosity, overflew the provinces of Ciudad Real and Córdoba. It began over Ciudad Real at an altitude of about 105 km, and ended over Córdoba at a height of around 82 km. The event is associated with the Daytime Arietids meteor shower.

This bright meteor was recorded in the framework of the SMART project, operated by the Southwestern Europe Meteor Network (SWEMN), from the meteor-observing stations located at Sevilla, La Hita (Toledo), La Sagra (Granada), Calar Alto (Almería), Sierra Nevada (Granada) and Madrid (Jaime Izquierdo, Complutense University of Madrid). The event has been analyzed by the principal investigator of the SMART project: Dr. Jose M. Madiedo, from the Institute of Astrophysics of Andalusia (IAA-CSIC).

Fireball 4

Green meteor fireball streaks across the skies of Jacksonville, Florida

Florida meteor fireball
© YouTube/News4Jax (screen capture)
"Beautiful" is how it was described by John Cermack, floor director here at Channel 4. He was outside just before The 10 O'Clock News and came rushing in to tell me all about it.

Did he get any video? No. But some Ring cameras around Jacksonville sure did!

The video above was sent to us by Marvin Wagner. The video is looking east across the St. Johns River just north of Green Cove Springs.

It took place about 9:50 p.m. and crossed from southwestern to southeastern skies as it broke up. Typically breaking up between 30 and 70 miles up in the atmosphere and traveling at tens of thousands of mph, these rocks heat up rapidly and this causes them to explode. You can see that in the video.

What you can't see is that it was greenish in color. This implies it was made of nickel, which burns green.

The exact track appears to have come across the state of Florida probably across Tampa to Daytona.

Fireball 5

Large meteor fireball recorded over Almería, Spain

Almeria meteor fireball
Last June 5th at 23h29 UT a impressive fireball was registered to the Southwest of Calar Alto Observatory in Almería.

Unfortunately, most Spain was covered with clouds, so no other stations could detect this object. Due to this, triangulation was impossible and no more data is available concerning this phenomena.

However, Calar Alto Observatory enjoyed clear skies and one of the external surveillance cameras could register the impressive fireball.

Below is the video registered with the external surveillance camera at Calar Alto Observatory in Almería.

Fireball 4

Bright meteor fireball over Southern Queensland, Australia


A very bright meteor captured early this morning. Sony IMX291 sensor. The final image is a stack of all the captures, created by summing the maxima of the images. The camera is very sensitive and the image stack is saturated so the meteor appears white. There is a very faint green trail seen on an averaged stack (not shown).

Ice Cube

Suspected megacryometeor crashes through Wisconsin home, nearly hitting resident

Imagine trying to get up and get ready for your day but instead of having to shut off your alarm clock, you are greeted by a cannonball-sized chunk of ice.

While Mother Nature can be known for some pretty interesting weather, this strange icy incident left one Elk Mound family with a large hole right above their bed.

A large ball of ice, weighing 12.6 pounds, crashed through the bedroom ceiling.

Comment: Footage of another possible megacryometeor crashing to earth was captured by CCTV in London in 2019: Block of ice falls from sky landing metres from London street cleaner (VIDEO)

Website Strange Sounds has documented a number of other similar events in California, Scotland, Italy, and India.

As for the cause behind this phenomena, Wikipedia notes:
A megacryometeor is a very large chunk of ice which, despite sharing many textural, hydro-chemical, and isotopic features detected in large hailstones, is formed under unusual atmospheric conditions which clearly differ from those of the cumulonimbus cloud scenario (i.e. clear-sky conditions). They are sometimes called huge hailstones, but do not need to form under thunderstorm conditions. Jesús Martínez-Frías, a planetary geologist and astrobiologist at Institute of Geosciences (Spanish: Instituto de Geociencias, IGEO) in the Spanish National Research Council (Spanish: Consejo Superior de Investigaciones Científicas, CSIC)[1] in Madrid, pioneered research into megacryometeors in January 2000 after ice chunks weighing up to 6.6 pounds (3.0 kg) rained on Spain out of cloudless skies for ten days.


The process that creates megacryometeors is not completely understood, mainly with respect to the atmospheric dynamics necessary to produce them. They may have a similar mechanism of formation to that leading to production of hailstones.[4] Scientific studies show that their composition matches normal tropospheric rainwater for the areas in which they fall. In addition, megacryometeors display textural variations of the ice and hydro-chemical and isotopic heterogeneity, which evidence a complex formation process in the atmosphere.[5][6][7] It is known that they do not form from airplane toilet leakage because the large chunks of ice that occasionally do fall from airliners are distinctly blue due to the disinfectant used (hence their common name of "blue ice").

Some have speculated that these ice chunks must have fallen from aircraft fuselages[4] after plain water ice accumulating on those aircraft through normal atmospheric conditions has simply broken loose. However, similar events occurred prior to the invention of aircraft.[8][9] Studies indicate that fluctuations in tropopause, associated with hydration of the lower stratosphere and stratospheric cooling, can be related to their formation.[5] A detailed micro-Raman spectroscopic study made it possible to place the formation of the megacryometeors within a particular range of temperatures: −10 to −20 °C (14 to −4 °F).[10] They are sometimes confused with meteors because they can leave small impact craters.
And, indeed, there are many signs in our skies that our atmosphere is undergoing a shift towards cooling:

Fireball 2

Meteor fireball over Brazil may have come from another solar system

Fireball over Brazil
A small space rock that slammed into Earth's atmosphere and flamed out as a spectacular fireball over Brazil may have traveled from beyond our solar system to put on the bright display.

Brazil's Meteor Watch Network (Bramon) captured the so-called Earth-grazer meteor on Sunday evening over the southern part of the country. Two cameras in the network captured the meteoroid burning up in a brilliant streak painting its way across the night sky.

The fireball is considered an Earth-grazer because it collided with our atmosphere at a very shallow angle. A statement from Bramon suggests the meteor may have interstellar origins. "Preliminary analyses indicate that it was generated by a meteoroid coming from outside the solar system," it said.

The science around interstellar objects visiting our solar system is nascent and controversial.

Comment: See also: Large meteor fireball recorded in Rio Grande do Sul and Santa Catarina, Brazil