2011 ES4 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 ES4 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.
2011 ES4 orbits the sun every 419 days (1.15 years), coming as close as 0.83 AU and reaching as far as 1.36 AU from the sun. Based on its brightness and the way it reflects light, 2011 ES4 is probably between 0.011 to 0.051 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.
2011 ES4's orbit is 0.00 AU from Earth's orbit at its closest point. This means that its orbit is very close to Earth's orbit.
2011 ES4 has 18 close approaches predicted in the coming decades:
|Date||Distance from Earth (km)||Velocity (km/s)|
|March 4, 2019||21,281,621||11.933|
|Sept. 2, 2020||1,479,025||8.056|
|March 13, 2027||2,008,127||7.736|
|May 1, 2035||24,682,102||6.115|
|June 22, 2043||28,238,312||7.000|
|Aug. 24, 2051||12,831,748||5.376|
|March 7, 2058||19,213,185||11.500|
|Sept. 7, 2059||12,357,855||10.137|
|March 18, 2066||8,806,839||6.090|
|May 27, 2074||28,359,570||7.004|
|July 29, 2082||21,275,959||5.478|
|March 5, 2089||23,942,942||12.460|
|Sept. 6, 2090||9,381,665||9.561|
|March 28, 2097||15,823,723||4.925|
|June 20, 2105||28,288,822||7.018|
|Sept. 2, 2113||2,004,279||7.363|
|March 4, 2120||27,374,532||13.131|
|Sept. 3, 2121||404,920||7.918|
2011 ES4's orbit is determined by observations dating back to Feb. 23, 2011. It was last officially observed on Sept. 12, 2020. The IAU Minor Planet Center records 142 observations used to determine its orbit.
2011 ES4 can be reached with a journey of 362 days. This trajectory would require a delta-v of 8.052 km/s. To put this into perspective, the delta-v to launch a rocket to Low-Earth Orbit is 9.7 km/s. There are 31,879 potential trajectories and launch windows to this asteroid.
See more at the NHATS Mission Trajectories table for 2011 ES4.
The position of 2011 ES4 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.
The below comparison is an artistic rendering that uses available data on the diameter of 2011 ES4 to create an approximate landscape rendering with New York City in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.