Wednesday, 22 May 2019

Bright fireball meteor over South Australia.

Witnesses in South Australia and Victoria, have reported a bright fireball meteor being seen over the Adelaide area at about 10.30 pm local time on Tuesday 21 May 2019. The object moved from north to south, flaring green originally then a stronger orange, colours which may indicate the presence of sodium and magnesium in the meteor. A fireball is defined as a meteor (shooting star) brighter than the planet Venus. These are typically caused by pieces of rock burning up in the atmosphere, but can be the result of man-made space-junk burning up on re-entry. 

Fireball over the Adelaide area of South Australia on 21 May 2019. 9News Australia.

Objects of this size probably enter the Earth's atmosphere several times a year, though unless they do so over populated areas they are unlikely to be noticed. They are officially described as fireballs if they produce a light brighter than the planet Venus. The brightness of a meteor is caused by friction with the Earth's atmosphere, which is typically far greater than that caused by simple falling, due to the initial trajectory of the object. Such objects typically eventually explode in an airburst called by the friction, causing them to vanish as an luminous object. However this is not the end of the story as such explosions result in the production of a number of smaller objects, which fall to the ground under the influence of gravity (which does not cause the luminescence associated with friction-induced heating).
 
These 'dark objects' do not continue along the path of the original bolide, but neither do they fall directly to the ground, but rather follow a course determined by the atmospheric currents (winds) through which the objects pass. Scientists are able to calculate potential trajectories for hypothetical dark objects derived from meteors using data from weather monitoring services.
 
See also...
 
https://sciencythoughts.blogspot.com/2019/05/fireball-over-lake-michigan.htmlhttps://sciencythoughts.blogspot.com/2019/04/fireball-meteor-over-new-jersey.html
https://sciencythoughts.blogspot.com/2019/04/the-lyrid-meteor-shower.htmlhttps://sciencythoughts.blogspot.com/2019/03/fireball-meteor-over-new-york-state.html
https://sciencythoughts.blogspot.com/2019/03/nasas-terra-satelite-detects-huge.htmlhttps://sciencythoughts.blogspot.com/2019/03/looking-for-asteroids-in-2018-la-like.html
Follow Sciency Thoughts on Facebook.

1 comment:

  1. Hi everyone, Are you into trading or just wish to give it a try, please becareful on the platform you choose to invest on and the manager you choose to manage your account because that’s where failure starts from be wise. After reading so much comment i had to give trading tips a try, I have to come to the conclusion that binary options pays massively but the masses has refused to show us the right way to earn That’s why I have to give trading tips the accolades because they have been so helpful to traders . For a free masterclass strategy kindly contact maryshea03@gmail.com for a free masterclass strategy. She'll give you a free tutors on how you can earn and recover your losses in trading for free..

    ReplyDelete