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Active Asteroid
Active asteroids are small Solar System bodies that have asteroid-like orbits but show comet-like visual characteristics. That is, they show comae, tails, or other visual evidence of mass-loss (like a comet), but their orbit remains within Jupiter's orbit (like an asteroid). These bodies were originally designated main-belt comets (MBCs) in 2006 by astronomers David Jewitt and Henry Hsieh, but this name implies they are necessarily icy in composition like a comet and that they only exist within the main-belt, whereas the growing population of active asteroids shows that this is not always the case. The first active asteroid discovered is 7968 Elst–Pizarro. It was discovered (as an asteroid) in 1979 but then was found to have a tail by Eric Elst and Guido Pizarro in 1996 and given the cometary designation 133P/Elst-Pizarro. Orbits Unlike comets, which spend most of their orbit at Jupiter-like or greater distances from the Sun, active asteroids follow orbits within the orb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
596 Scheila, 5 Minute Exposure, Dec
__NOTOC__ Year 596 ( DXCVI) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 596 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Byzantine Empire * Emperor Maurice uses the city of Marcianopolis (modern Bulgaria) as a military base of operations on the lower Danube River, against the Slavs on the Balkans. Britain * Battle of Raith: An invading force of Angles lands on the Fife coast near Raith ( Kirkcaldy) and defeats an alliance of Scots, Britons and Picts, under King Áedán mac Gabráin of Dál Riata (Scotland). Asia * Emperor Wéndi sends diplomatic letters to the royal court of Goguryeo (Korea). He demands the cancellation of the military alliance with the Eastern Turk Khanate, and the raiding of Sui border regions. By topic Religion * Gregorian Mission: Augustin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
