September 1, 2017 - Nasa tracked the Asteriod
Florence as it passed earth .
Okamoto of Ibaraki University in Japan and his colleagues now have gleaned new details about the size, composition, and crystal structure of dust within the Beta Pictoris disk, suggest the location of a possible planet as well as of a trio of asteriod
or comet belts.
The impact of a 10-kilometer diameter asteriod
65 million years ago wiped out the dinosaurs and 90 percent of the other species on the planet.
Rotation Periods * Asteriod
Dates of observations Number of observations 971 Alsatia April 1, 3, 4, 5 113 691 Lehigh April 9, 11, 12, 13 137 891 Gunhild April 27, 30; May 1, 2 190 1017 Jacqueline May 4, 5, 7, 9, 10 158 729 Watsonia June 3, 4, 6 to 10 319 1277 Dolores July 3, 4, 5, 7, 9, 10, 11 330 Asteriod
Period (days) Amplitude 971 Alsatia 6.
It had been almost a century now since the first asteriod
was discovered by Piazzi (see 1802), and others had been discovered in astonishing numbers.
was discovered in August 1998 by astronomers working with MIT's Lincoln Near Earth Asteroid Research program in New Mexico.
DSI), the 50-meter-diameter, 190,000 metric-ton Asteriod
2012 DA14 that will make a close inter-orbital pass at Earth on Friday could have as much as $195 billion in mineral resources.
Although more severe die-offs wracked the planet in earlier times, the K-T extinctions have captured widespread interest in the dozen years since researchers found evidence linking them to the impact of a huge asteriod