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- Q3597924 subject Q18167754.
- Q3597924 subject Q7152525.
- Q3597924 subject Q8257314.
- Q3597924 abstract "1991 BA is an asteroid that was discovered by Spacewatch on January 18, 1991 and passed within 160,000 km (100,000 mi) of Earth. This is a little less than half the distance to the Moon. 1991 BA is approximately 5 to 10 meters (15 to 30 ft) in diameter and is listed on the Sentry Risk Table. It follows a highly eccentric (0.682), low-inclination (2.0°) orbit of 3.36 years duration, ranging between 0.713 and 3.773 AU from the Sun (semi-major axis of 2.243 AU). 1991 BA was, at the time of its discovery, the smallest and closest confirmed asteroid outside of Earth's atmosphere. 1991 BA is too faint to be observed except during close approaches to Earth and is considered lost.Virtual clones of the asteroid that fit the uncertainty region in the known trajectory show a 1 in 1,961,000 chance that the asteroid will impact Earth on 2023 January 18. It is estimated that an impact would produce an upper atmosphere air burst equivalent to 19 kt TNT, roughly equal to Nagasaki's Fat Man. The asteroid would appear as a bright fireball and fragment in the air burst into smaller pieces that would hit the ground at terminal velocity producing a meteorite strewn field. Impacts of objects this size are estimated to occur approximately once a year. Asteroid 2008 TC3 was an object of similar size that was discovered less than a day before its impact on Earth on October 7, 2008 and produced a fireball and meteorite strewn field in the Sudan.".
- Q3597924 wikiPageExternalLink Item1.
- Q3597924 wikiPageWikiLink Q1049.
- Q3597924 wikiPageWikiLink Q1059884.
- Q3597924 wikiPageWikiLink Q1621662.
- Q3597924 wikiPageWikiLink Q1811.
- Q3597924 wikiPageWikiLink Q18167754.
- Q3597924 wikiPageWikiLink Q188163.
- Q3597924 wikiPageWikiLink Q2.
- Q3597924 wikiPageWikiLink Q213563.
- Q3597924 wikiPageWikiLink Q2627361.
- Q3597924 wikiPageWikiLink Q3062538.
- Q3597924 wikiPageWikiLink Q3478803.
- Q3597924 wikiPageWikiLink Q3863.
- Q3597924 wikiPageWikiLink Q405.
- Q3597924 wikiPageWikiLink Q463796.
- Q3597924 wikiPageWikiLink Q4698303.
- Q3597924 wikiPageWikiLink Q525.
- Q3597924 wikiPageWikiLink Q6684357.
- Q3597924 wikiPageWikiLink Q7152525.
- Q3597924 wikiPageWikiLink Q8257314.
- Q3597924 comment "1991 BA is an asteroid that was discovered by Spacewatch on January 18, 1991 and passed within 160,000 km (100,000 mi) of Earth. This is a little less than half the distance to the Moon. 1991 BA is approximately 5 to 10 meters (15 to 30 ft) in diameter and is listed on the Sentry Risk Table. It follows a highly eccentric (0.682), low-inclination (2.0°) orbit of 3.36 years duration, ranging between 0.713 and 3.773 AU from the Sun (semi-major axis of 2.243 AU).".
- Q3597924 label "1991 BA".