Key Facts

  • Classified as a Interior-Earth Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 23,008,838 km of Earth in 2028
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

2017 XA1 is a very small asteroid with an orbit that is entirely confined within Earth's orbit. NASA JPL has classified 2017 XA1 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2017 XA1 orbits the sun every 266 days (0.73 years), coming as close as 0.65 AU and reaching as far as 0.97 AU from the sun. Based on its brightness and the way it reflects light, 2017 XA1 is probably between 0.153 to 0.342 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

Close Approaches

2017 XA1's orbit is 0.05 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.

2017 XA1 has 18 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Nov. 14, 2028 23,008,838 11.866
Nov. 16, 2036 14,483,015 10.630
Nov. 18, 2044 8,774,162 9.825
Nov. 18, 2052 7,240,502 9.459
Nov. 19, 2060 7,676,717 9.261
Nov. 19, 2068 9,851,824 9.074
Nov. 19, 2076 14,520,524 8.974
Nov. 19, 2084 21,519,694 9.156
Nov. 16, 2111 25,136,142 12.159
Nov. 18, 2119 15,569,378 10.756
Nov. 19, 2127 8,851,350 9.824
Nov. 20, 2135 7,176,566 9.414
Nov. 21, 2143 8,062,069 9.195
Nov. 21, 2151 11,062,306 9.022
Nov. 21, 2159 17,330,206 9.018
Nov. 21, 2167 26,998,661 9.555
Nov. 15, 2186 29,189,912 12.775
Nov. 17, 2194 18,946,547 11.212

Images and Observations

2017 XA1's orbit is determined by observations dating back to Dec. 5, 2017. It was last officially observed on Jan. 15, 2018. The IAU Minor Planet Center records 19 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 2017 XA1:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 0.809618190561 AU
  • Eccentricity: 0.201567371503
  • Inclination: 17.1769970575°
  • Longitude of Ascending Node: 239.65958461°
  • Argument of Periapsis: 327.622063501°
  • Mean Anomaly: 185.990158602°

Physical Characteristics

  • Diameter: ~0.197 km
  • Magnitude: 21.2

Derived Characteristics

  • Orbit Period: 266 days (0.73 years)
  • Avg. Orbit Speed: 33.10 km/s
  • Aphelion Distance: 0.97 AU
  • Perihelion Distance: 0.65 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 2017 XA1 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.