# (419624) 2010 SO16

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(419624) 2010 SO16 is a sub-kilometer asteroid in a co-orbital configuration with Earth, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It was discovered by the Wide-field Infrared Survey Explorer space telescope (WISE) on 17 September 2010.[1][2]

Discovery [1] Orbit with inner solar system WISE Low Earth orbit 17 September 2010 (419624) 2010 SO16 2010 SO16 Epoch 4 September 2017 (JD 2458000.5) Uncertainty parameter 0 5.28 yr (1,928 days) 1.0785 AU 0.9272 AU 1.0028 AU 0.0754 1.00 yr (367 days) 173.30° 0° 58m 53.04s / day 14.520° 40.397° 108.99° 0.0299 AU (11.6 LD) 0.357±0.126 km[3] 0.084±0.057[4] 20.5[1]

## Description

The orbit was described by Christou Apostolos and David Asher at the Armagh Observatory in Northern Ireland.[5] The object has an absolute magnitude of 20.5.[1] Observations by the discovering WISE telescope give a diameter of 357 meters and an albedo of 0.084.[3][4]

2010 SO16 has a horseshoe orbit that allows it to stably share Earth's orbital neighborhood without colliding with it. It is one of a handful of known asteroids with an Earth-following orbit, a group that includes 3753 Cruithne, and the only known asteroid in an horseshoe orbit with Earth. It is, however, neither an Aten asteroid nor an Apollo asteroid because the semi-major axis of its orbit is neither less than nor greater than 1 AU, but oscillates between approximately 0.996 and 1.004 AU, with a period of about 350 years.[5] In its ~350 yr horseshoe cycle, it never approaches Earth more closely than about 0.15 AU, alternately trailing and leading.

According to various simulations 2010 SO16 will remain in this orbit for at least 120,000 years and possibly for more than a million years, which is unusually stable compared to other similar objects.[6] One reason for this stability is its low orbital eccentricity, ${\displaystyle <0.084}$ .[5]

A precovery of 2010 SO16 may have been located in a 2005 Spitzer Space Telescope image.[7]

Animation of (419624) 2010 SO16 orbit from 1600 to 2500
Relative to Sun and Earth
Around Earth
Around Sun
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