Mastodawn

Michael Busch Jun 20, 2023

Presentations at #ACM2023 about #2022WJ1 flashing in the sky over Niagara last year by @teddykareta, Paul Wiegert, & @meteordoc.

Highlighting the disappointment of the meteorites being underwater right off the coast of the lake.

One rock might have landed on the ground, but nothing yet found between snow & grape vines.

Michael Busch Apr 6, 2023

.@pgbrown described the #2022WJ1 impact and breakup from last November to #PDC2023 today: https://az659834.vo.msecnd.net/eventsairwesteuprod/production-atpi-public/08ebca3439744d63b5e4a193c144fcff
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RT @pgbrown
Bright fireball over Southern Ontario last night at 3:26 am caused by impact of asteroid 2022WJ1. This sub-meter-sized asteroid (one of the smallest NEAs ever detected) produced a spectacular fireball, though it was cloudy in many…
https://twitter.com/pgbrown/status/1594024499862982658

Michael Busch Feb 13, 2023

An interesting thing I've just noticed:

In the past year, atmospheric monitoring has reported 7 or 8 impacts onto Earth with energy ~1 kiloton TNT-equivalent or more - https://cneos.jpl.nasa.gov/fireballs/ .

Three of those have been found in advance: #2022EB5, #2022WJ1, and now #2023CX1.

Fireballs

NASA's Near-Earth Object (NEO) web-site. Data related to Earth impact risk, close-approaches, and much more.

Show thread

Michael Busch Feb 12, 2023

For those not familiar with these things:

The brightness and estimated distance to the newly-discovered asteroid #Sar2667 give a very approximate size of ~1 m.

It will flash harmlessly in the sky, as we saw when asteroid #2022WJ1 did the same thing over Niagara last November.

Show thread

Tom Ruen Nov 23, 2022

For fun, I tried spinning view around the earth, to better show the trajectory of impact asteroid 2022WJ1 on Nov 19, 2022 at 8:27 UTC. Line are drawn down to the surface for every 1 minute of motion. #Astronomy #2022WJ1

Tom Ruen Nov 23, 2022

Here's a view simulated view of 1-meter "asteroid" 2022 WJ1's motion on 11/19/22 before impact (from JPL Horizons).
It went into earth's shadow at 7:59 UT, 28 minutes before impact, although even sunlit it would have been below naked eye brightness before hitting the atmosphere. Tick marks are 1 min. #astronomy #2022WJ1
https://en.wikipedia.org/wiki/2022_WJ1

2022 WJ1 - Wikipedia

Ian J. O'Neill Nov 22, 2022

An incredible achievement by the planetary defense community! #2022WJ1 was a tiny asteroid on a collision course with Earth. But astronomers saw it coming, and NASA’s Scout impact hazard assessment system calculated where it would hit: https://www.jpl.nasa.gov/news/nasa-program-predicted-impact-of-small-asteroid-over-ontario-canada #CNEOS #PDCO #NASA #Scout #PlanetaryDefense

NASA Program Predicted Impact of Small Asteroid Over Ontario, Canada

2022 WJ1 was a tiny asteroid on a collision course with Earth. But astronomers saw it coming, and NASA’s Scout impact hazard assessment system calculated where it would hit.

NASA Jet Propulsion Laboratory (JPL)

Bob Hawkes Nov 22, 2022

Western University Meteor Group share information on likely fall zone for remnants of Asteroid 2022 WJ1. Information and images courtesy of Western Meteor Group. #meteor #asteroid #Ontario #Canada #astronomy #WesternU #groundpath #2022WJ1 https://news.westernu.ca/2022/11/niagara-meteor/

Western News - Bright fireball may have dropped meteorites in Niagara region

A cosmic drama unfolded over southern Ontario on Friday night (November 18, 2022), triggering an international collaboration and a meteorite hunt.

Western News

Scott Sutherland Nov 21, 2022

A small asteroid burned up over Southern Ontario Saturday morning, and was followed by another bright fireball Saturday night.
- the first is now one of only six asteroids that were discovered prior to impact, and it may be the only one that impacted over a heavily populated area!
#asteroid #2022WJ1 #C8FF042 #meteor #fireball #space

https://www.theweathernetwork.com/ca/news/article/two-fireballs-in-one-day-blazed-over-southern-ontario-this-weekend