Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the U.S. Capitol building (0.45 km diameter)
  • Will pass within 27,922,865 km of Earth in 2027
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

138947 (2001 BA40) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2001 BA40 as a "Near Earth Asteroid" due to its orbit's proximity to Earth, but it is not considered potentially hazardous because computer simulations have not indicated any imminent likelihood of future collision.

2001 BA40 orbits the sun every 432 days (1.18 years), coming as close as 0.83 AU and reaching as far as 1.40 AU from the sun. 2001 BA40 is about 0.4 kilometers in diameter, making it a small to average asteroid, comparable in size to the U.S. Capitol building.

Close Approaches

2001 BA40's orbit is 0.18 AU from Earth's orbit at its closest point. This means that there is an wide berth between this asteroid and Earth at all times.

2001 BA40 has 15 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
July 17, 2027 27,922,865 9.988
Aug. 5, 2040 29,291,306 9.472
May 4, 2046 29,154,970 9.430
May 23, 2059 27,762,198 9.819
June 9, 2072 27,151,128 10.167
June 27, 2085 27,212,944 10.250
July 16, 2098 27,965,050 10.007
Aug. 6, 2111 29,348,234 9.487
May 5, 2117 28,972,368 9.456
May 28, 2130 27,444,062 9.921
June 19, 2143 27,077,420 10.253
July 10, 2156 27,710,531 10.127
Aug. 1, 2169 29,048,865 9.625
April 30, 2175 29,497,483 9.458
May 19, 2188 27,791,706 9.727

Images and Observations

2001 BA40's orbit is determined by observations dating back to Jan. 23, 2001. It was last officially observed on Feb. 1, 2015. The IAU Minor Planet Center records 327 observations used to determine its orbit.

Accessibility and Exploration

This asteroid is not considered a viable target for human exploration by the NHATS study.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2001 BA40:

References

Search

   or view a random object

Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.11894832862 AU
  • Eccentricity: 0.253786335432
  • Inclination: 12.8453282583°
  • Longitude of Ascending Node: 270.896256482°
  • Argument of Periapsis: 0.0195254449471°
  • Mean Anomaly: 32.1768048188°

Physical Characteristics

  • Diameter: 0.44700 km
  • Magnitude: 18.6
  • Albedo: 0.292

Derived Characteristics

  • Orbit Period: 432 days (1.18 years)
  • Avg. Orbit Speed: 28.16 km/s
  • Aphelion Distance: 1.40 AU
  • Perihelion Distance: 0.83 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 138947 (2001 BA40) is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.