On Sat, Mar 21, 2020 at 09:39:54AM +1100, Zenaan Harkness wrote: > On Fri, Mar 20, 2020 at 07:26:28AM -0400, grarpamp wrote: > > 2020EF and 2020DP4 are moot. > > > > The bad boys are out there, lucky if you know ahead of time, > > nothing you can do > > > There are those with access to heavy machinery who can lay plans and actions > to build semi-underground, extremely well insulated, dwellings with indoor > greenhouse. Takes about 2 years to "get off the ground" if you have the > resources/ money/ access to like minded folks, and put in substantial elbow > grease. > > Too bad for city dwellers... > > > > > about the ones you would know about > > that are relavant to and in your lifetime anyway. > > > > https://en.wikipedia.org/wiki/Near-Earth_object > > https://cneos.jpl.nasa.gov/sentry/ > > https://cneos.jpl.nasa.gov/ca/ > > https://ssd.jpl.nasa.gov/
OK, soap, apteroids muh grits! Big, bad, unpredictable asteroids. For those who missed the memo, Australia just had a muffaducker of a sly nigt sky fly by :) But let's have a little think about this ... more below. ‘Martians Have Hit’: Glowing Fireball Turns Australian Sky Green in Jaw-Dropping Sighting https://sputniknews.com/science/202006151079615844-martians-have-hit-glowing-fireball-turns-australian-sky-green-in-jaw-dropping-sighting/ Astronomers believe that the object was an asteroid about 570 meters in diameter that passed our planet at a safe distance. Some users have suggested that it was part of a rocket launched recently. An emerald green fireball was seen streaking across the night sky over Australia over the weekend. Users have posted footage of the spectacular sighting on social media (check out here, here and here). https://www.facebook.com/joshua.vearing.1/posts/10219189761672351%20 https://www.facebook.com/100008142968082/videos/2644170255864381 https://www.facebook.com/groups/AustralianMeteorReports/permalink/1423932117810762/%20 “Martians have hit the Pilbara,” wrote one skygazer in a remote region of Western Australia. “Next phase of 2020 incoming!” https://www.facebook.com/joshua.vearing.1/posts/10219189761672351 Glen Nagle, a manager at NASA’s Canberra Deep Space Communication Complex, said there had been reports of sightings as far away as the Northern Territory and South Australia. “It was really a spectacular observation” he told local media. “People have captured something very special here.” There has been some speculation among social media users that the object could have been the debris from a rocket, but astronomers said it was likely an asteroid, given that space debris tend to emit crackles and sparks and also burn up quickly, which was not the case with the fireball in question. According to 9News, astronomers believe that the object was an asteroid called 2002 NN4, which was earlier predicted to pass by Earth this past Saturday. It has an estimated diameter of 1,870 feet (570 meters) across and was expected to come within roughly 5.2 million kilometres from Earth, 13 times further away than the moon. https://www.9news.com.au/world/wa-asteroid-green-glow-captured-on-camera-as-2002-nn4-asteroid-passes-the-earth/0821475c-7120-4b9a-a35e-9d4d71fc9a77?ocid=Social-9NewsP Soap muh fella w.ggers, what could be the fuss? Firstly, let's realise the magnitude of this teeny snippet from the Nine News link above: "Earlier today, other astronomers said they believed it could have been Asteroid 2002 NN4, which was scheduled to pass Earth about 11.20pm yesterday. That asteroid is estimated to be the size of six football fields, with estimated diameter of up to 570 metres, according to the Centre for Near Earth Object Studies. https://cneos.jpl.nasa.gov/ca/ Despite being clearly visible, the asteroid was about 5.2 million kilometres away from our planet, 13 times further away than the moon, NASA says, so there was no risk of it hitting the Earth. " Now there be some hogwash folksies, as thangs flying by Earth don't "get heat up so much in our atmosphere that they glow as they streak through it", unless they actually pass through actual atmosphere; and Earth's atmosphere has layers, onion boy: Atmosphere of Earth https://en.wikipedia.org/wiki/Atmosphere_of_Earth#Stratification .. From highest to lowest, the five main layers are: - Exosphere: 700 to 10,000 km (440 to 6,200 miles) - Thermosphere: 80 to 700 km (50 to 440 miles)[18] - Mesosphere: 50 to 80 km (31 to 50 miles) - Stratosphere: 12 to 50 km (7 to 31 miles) - Troposphere: 0 to 12 km (0 to 7 miles)[19] Exosphere The exosphere is the outermost layer of Earth's atmosphere (i.e. the upper limit of the atmosphere). It extends from the exobase, which is located at the top of the thermosphere at an altitude of about 700 km above sea level, to about 10,000 km (6,200 mi; 33,000,000 ft) where it merges into the solar wind. This layer is mainly composed of extremely low densities of hydrogen, helium and several heavier molecules including nitrogen, oxygen and carbon dioxide closer to the exobase. The atoms and molecules are so far apart that they can travel hundreds of kilometers without colliding with one another. Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space. These free-moving particles follow ballistic trajectories and may migrate in and out of the magnetosphere or the solar wind. https://en.wikipedia.org/wiki/Magnetosphere The exosphere is located too far above Earth for any meteorological phenomena to be possible. However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere. The exosphere contains most of the satellites orbiting Earth. https://en.wikipedia.org/wiki/Aurora_borealis https://en.wikipedia.org/wiki/Aurora_australis And under exosphere we read similar: Upper boundary of Earth https://en.wikipedia.org/wiki/Exosphere#Upper_boundary_of_Earth In principle, the exosphere covers distances where particles are still gravitationally bound to Earth, i.e. particles still have ballistic orbits that will take them back towards Earth. The upper boundary of the exosphere can be defined as the distance at which the influence of solar radiation pressure on atomic hydrogen exceeds that of Earth's gravitational pull. This happens at half the distance to the Moon (the average distance between Earth and the Moon is 384,400 kilometres (238,900 mi)). The exosphere, observable from space as the geocorona, is seen to extend to at least 10,000 kilometres (6,200 mi) from Earth's surface. So "The exosphere is located too far above Earth for any meteorological phenomena to be possible." Mm hmm. That's interesting, as meteor phenomena require the denser atmosphere as it is in the lower layers. Thiseleaves possible ionising effects, say a rotating metal object travelling through the Earth's magnetic domain (although the videos/ images of the object in question lead one to imagine some sort of burning ("exothermic") effect): https://en.wikipedia.org/wiki/Magnetosphere A magnetosphere is a region of space surrounding an astronomical object in which charged particles are affected by that object's magnetic field.[1][2] It is created by a star or planet with an active interior dynamo. .. https://en.wikipedia.org/wiki/Magnetosphere#Earth's_magnetosphere .. On the dayside of Earth, the magnetic field is significantly compressed by the solar wind to a distance of approximately 65,000 kilometers (40,000 mi). .. On Earth's nightside, the magnetic field extends in the magnetotail, which lengthwise exceeds 6,300,000 kilometers (3,900,000 mi).[3] .. So on this basis, the object at issue, allegedly at about 3.5 million km from Earth, is potentially well within Earth's dark side magnetic field of >6.3 million km. This however does not smell right, as the videos clearly show a firey tail, which would have to be well within the Earth's thermosphere (or below). The light is also green, suggesting a relevant amount of copper in this object, but how would this translate to an object allegedly "at a safe distance away of around 3.5 million km away", way outside Earth's atmosphere, but at least within striking distance of Earth's magnetosphere - is 'has rotating copper core' supposed to translate into 'green magnetic field effect'? Perhaps someone with sufficient physics knowledge will answer this for us... In any case, this videoed object certainly appears to be a typical, perhaps rather large, meteor type of object travelling, and more importantly burning, though our atmosphere ... so "hey you object, get orf mah lawn!" Now for lé punché line: if these initial reports are correct and this is the same object identified back in 2002 as "2002 NN4", and which was meant to pass by at a distance of around 13 LD (lunar distances) 8 days earlier accoding to NASA: https://cneos.jpl.nasa.gov/ca/ (JavaShaft alert) then we can say with certainty that some combination of the following must be true: - that NASA's mathematical calculations have a serious problem - that the 2020-06-14 (or 15?) object is a completely different object to 2002_NN4
