Tags: Planet.

21531 Billcollin (1998 OS) is a main-belt asteroid discovered on July 20 1998 by the OCA-DLR Asteroid Survey at Caussols.

apoapsis (km)
4.42775e+11
orbital period (μ)
1.44681e+08
periapsis (km)
3.82923e+11
absolute magnitude
14.8
discovery date
1998-07-20
discoverer
OCA-DLR Asteroid Survey
epoch
May 14 2008
former name
1998 OS

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