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1991 BA is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group that was first observed by Spacewatch on 18 January 1991, and passed within 160,000 km (100,000 mi) of Earth. This is a little less than half the distance to the Moon. With a 5-hour observation arc the asteroid has a poorly constrained orbit and is considered lost. It could be a member of the Beta Taurids.

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  • 1991 BA (en)
  • 1991 BA (in)
  • 1991 BA (it)
  • 1991 BA (fr)
  • 1991 BA (ja)
  • 1991 BA (sv)
  • 1991 BA (zh)
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  • 1991 BA is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group that was first observed by Spacewatch on 18 January 1991, and passed within 160,000 km (100,000 mi) of Earth. This is a little less than half the distance to the Moon. With a 5-hour observation arc the asteroid has a poorly constrained orbit and is considered lost. It could be a member of the Beta Taurids. (en)
  • 1991 BA est un astéroïde Apollon sub-kilométrique qui a été observé pour la première fois par Spacewatch le 18 janvier 1991. Il est passé à moins de 160 000 kilomètres de la Terre, un peu moins de la moitié de la distance Terre-Lune. Avec un arc d'observation de 5 heures, l'astéroïde a une orbite mal contrainte et est considéré comme perdu. Il pourrait s'agir d'un membre des . (fr)
  • 1991 BA adalah sebuah asteroid. Asteroid ini merupakan bagian dari asteroid Apollo, yang terletak dekat dengan bumi. Eksentrisitas orbit asteroid ini tercatat sebesar 0.671, sementara magnitudo mutlaknya adalah 28.6. (in)
  • 1991 BA は、アポロ群に属する地球近傍天体の1つである。 (ja)
  • 1991 BA är en Jordnära asteroid. Den upptäcktes 18 januari 1991 av Spacewatch vid Kitt Peak-observatoriet. Den tillhör asteroidgruppen Apollo. (sv)
  • 1991 BA是太空監視在1991年1月18日發現的一顆小行星的臨時名稱。它以160,000公里的近距離掠過地球，這個距離還不到地球與月球距離的一半。1991 BA的直徑大約只有5-10米（15-30英呎），並且被登錄在。它遵循一個高離心率（0.682）、低傾角（2.0°），與太陽距離在0.713至3.773天文單位（半長軸2.243AU）的軌道上運行。在1991 BA被發現的時候，它是當時所知在大氣層外離地球最近且最小的小行星。1991 BA非常暗淡，只有在接近地球時才能觀測到，因此被列為失蹤。 以機械模擬和以已知的彈道調適不確定區域顯示這顆小星在2023年1月18日與地球碰撞的機率是1,961,000分之一。估計這個碰撞會在產生，相當於19kt TNT，大約相當於在長崎引爆的小胖子。這顆小行星將會被蒸發，而這種小碰撞每年大約發生一次。 (zh)
  • 1991 BA è un meteoroide che alle 17:18 UTC del 18 gennaio 1991 transitò ad una distanza di quasi 170.000 km dalla superficie terrestre, equivalenti a 26,8 raggi terrestri dal centro del pianeta. Il primo ad essere osservato ad una distanza inferiore a quella tra Terra e Luna. Alla data della scoperta divenne l'oggetto con il passaggio più radente alla superficie tra quelli censiti dall'MPC,, superando 4581 Asclepius transitato il 22 marzo 1989. Il 20 maggio 1993 il primato gli fu strappato da 1993 KA2 che transitò più vicino alla Terra di quasi 25.000 km. (it)
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  • 1991 BA (en)
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