The orbit of 2020 SO around Earth and Sun from Nov. 2020 to Mar. 2021
Discovery [1][2]
Discovered by
Pan-STARRS 1
Discovery site
Haleakalā Obs.
Discovery date
17 September 2020
Designations
MPC designation
2020 SO
Alternative designations
P116rK2 [3]
Minor planet category
NEO · Apollo (May 2020)[4] Atira (Dec 2020)[2]
Orbital characteristics [2]
Epoch 17 December 2020 (JD 2459200.5)
Uncertainty parameter 2
Observation arc
167 days
Earliest precovery date
19 August 2020
Aphelion
0.988 AU
Perihelion
0.985 AU
Semi-major axis
0.986 AU
Eccentricity
0.00181
Orbital period (sidereal)
0.98 yr (357.9 d)
Mean anomaly
276.388°
Mean motion
1° 0m 21.877s / day
Inclination
0.1389°
Longitude of ascending node
216.656°
Argument of perihelion
311.989°
Earth MOID
0.01628 AU (May 2020)[4] 0.00106 AU (Dec 2020)
Physical characteristics
Mean diameter
6–12 m(assumed)[5]
Synodic rotation period
0.0026080±0.0000001 h[6] or 9.39 s
Apparent magnitude
22.4 (at discovery)[1] 14.1 (1 Dec 2020)[7]
Absolute magnitude (H)
27.66±0.34[4] 28.43[2]
2020 SO[a] is a near-Earth object identified to be the Centaur upper stage used on 20 September 1966 to launch the Surveyor 2 spacecraft. The object was discovered by the Pan-STARRS 1 survey at the Haleakala Observatory on 17 September 2020. It was initially suspected to be an artificial object due to its low velocity relative to Earth and later on the noticeable effects of solar radiation pressure on its orbit. Spectroscopic observations by NASA's Infrared Telescope Facility in December 2020 found that the object's spectrum is similar to that of stainless steel, confirming the object's artificial nature.[8] Following the object's confirmation as space debris, the object was removed from the Minor Planet Center's database on 19 February 2021.[9]
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^Cite error: The named reference MPEC-2021-D62 was invoked but never defined (see the help page).
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2020SO is a near-Earth object identified to be the Centaur upper stage used on 20 September 1966 to launch the Surveyor 2 spacecraft. The object was...
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