Yeah, also in the video it looks pretty much white although some folks did report an orange color to it at some point. There are a lot of bolides reported with a green color including the Peekskill fireball of the early 1990’s. I’ve seen one myself which was intensely green. I’ve always wondered why some bolides are green and others are white. There are basically two theories: 1.) the green bolides are travelling at just the right altitude for the atomic oxygen line at 577 nanometers to get excited and re-emit light, 2.) the composition of the meteor determines it, green bolides are caused by a lot of iron and nickel in the meteor itself which gets heated up, the electrons get excited and re-emit energy in the green part of the spectrum. Not sure which theory is more likely. Maybe #2 but I don’t really know.

A couple of points. No witnesses are reporting any green coloration to it the best I’ve been able to determine. I’m not sure that would be due to excitation of oxygen in the atmosphere or the composition of the meteor itself. Some folks were reporting sounds which is a bit unusual for bolides. I suppose that means it must have been fairly low in the atmosphere for the sound waves to travel all the way to the ground. Haven’t heard any triangulation estimates of its altitude. Has anyone else?

If you have enough lead time (i.e., you know the asteroid or comet is heading for an impact with the earth years ahead of time) you can try what is called a gravitational tractor. You park a massive spacecraft just out in front of the object to increase its speed or just behind it to slow it down. Acting over many years the spacecraft will have just enough cumulative delta-v on the object to make it miss the earth. I’m not sure how massive the spacecraft has to be but I’m guessing 10,000 kg and up would be required. Not sure if we have ever launched that size of a payload escaping the earth’s gravitational field or not.