1991 BA

1991 BA is the designation given to an asteroid which 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. 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 Earths atmosphere ^[1]. 1991 BA is too faint to be observed except during close approaches to Earth and is considered lost (see lost asteroids).

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