Key Facts

  • Classified as a Aten-class Asteroid
  • Comparable in size to the U.S. Capitol building (0.41 km diameter)
  • Will pass within 25,306,379 km of Earth in 2021
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

66400 (1999 LT7) is a very small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 1999 LT7 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.

1999 LT7 orbits the sun every 289 days (0.79 years), coming as close as 0.37 AU and reaching as far as 1.34 AU from the sun. 1999 LT7 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

1999 LT7's orbit is 0.06 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.

1999 LT7 has 29 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
April 11, 2021 25,306,379 13.683
July 2, 2022 11,787,993 18.081
April 11, 2036 23,928,897 18.721
June 30, 2037 20,464,661 13.571
June 30, 2041 17,819,052 19.629
April 11, 2055 22,170,615 17.919
July 1, 2056 17,730,892 13.981
June 29, 2060 20,399,506 20.224
April 11, 2074 21,532,614 17.546
July 2, 2075 16,270,394 14.232
June 30, 2079 22,376,626 20.668
April 10, 2093 20,543,657 16.520
July 3, 2094 12,376,226 15.046
June 28, 2098 29,028,003 22.150
April 11, 2112 23,213,668 14.245
July 3, 2113 10,108,215 17.419
April 12, 2127 20,845,038 17.090
July 3, 2128 13,456,996 14.778
April 14, 2142 27,228,909 19.921
July 1, 2143 23,731,530 13.186
April 15, 2146 29,204,780 12.956
July 2, 2147 18,521,683 19.740
April 12, 2161 22,304,653 14.557
July 4, 2162 9,673,539 17.133
April 12, 2176 20,906,565 17.222
July 4, 2177 14,229,015 14.633
June 29, 2181 28,552,678 22.018
April 13, 2195 22,720,918 14.399
July 4, 2196 9,798,907 17.119

Images and Observations

1999 LT7's orbit is determined by observations dating back to April 21, 1987. It was last officially observed on June 30, 2018. The IAU Minor Planet Center records 374 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 1999 LT7:

References

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Orbital Elements

  • Epoch: 2456128.5 JD
  • Semi-major axis: 0.855250908243 AU
  • Eccentricity: 0.572553921555
  • Inclination: 9.06562076934°
  • Longitude of Ascending Node: 79.8937909129°
  • Argument of Periapsis: 341.304796179°
  • Mean Anomaly: 75.8113655783°

Physical Characteristics

  • Diameter: 0.41100 km
  • Magnitude: 19.1
  • Albedo: 0.182

Derived Characteristics

  • Orbit Period: 289 days (0.79 years)
  • Avg. Orbit Speed: 32.21 km/s
  • Aphelion Distance: 1.34 AU
  • Perihelion Distance: 0.37 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 66400 (1999 LT7) 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.