(308242) 2005 GO21

Near-Earth asteroid September 2020 yes #FFC2E0 (308242) 2005 GO 21 2005GO21-20120617.jpg Goldstone radar image of asteroid 2005 GO 21taken on 17 June 2012 Siding Spring Srvy. Siding Spring Obs. 1 April 2005 (308242) 2005 GO 21 AtenNEOPHA 13 January 2016 (JD 2457400.5) 0 3385 days (9.27 yr) 1.0093 AU Gm on on 0.49720 AU Gm on 0.75324 AU Gm on 0.33992 0.65 yr (238.8 d) 24.926° 272.70° 19.462° 1.5077°/day 156.62° 0.0452219 AU Gm on ~1.6 km 11.00 h 16.5 (308242) 2005 GO 21 is a large Aten near-Earth asteroid and potentially hazardous object. It has a well determined orbit with an observation arc of 7 years and an uncertainty parameter of 0. It was discovered on 1 April 2005 by the Siding Spring Survey at an apparent magnitude of 18.1 using the 0.5 m in on Uppsala Southern Schmidt Telescope. Based on an absolute magnitude of 16.4, the asteroid has an estimated diameter of 1.6 km (within a factor of two). (308242) 2005 GO 21 is the largest potentially hazardous asteroid (PHA) discovered in 2005. On 21 June 2012 it passed Earth at a distance of 0.043963 AU km mi on on. The 2012 passage was studied with radar using Goldstone and Arecibo. References MPEC 2005-G31 : 2005 GO21 IAU Minor Planet Center 2005-04-05 https://www.minorplanetcenter.net/mpec/K05/K05G31.html 2012-06-18 (K05G21O) last observation: 2012-06-17; arc: 7.21 years JPL Small-Body Database Browser: 308242 (2005 GO21) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21 Jet Propulsion Laboratory 7 April 2016 2012-06-18 (308242) 2005 GO21 Goldstone Radar Observations Planning NASA/JPL Asteroid Radar Research Dr. Lance A. M. Benner http://echo.jpl.nasa.gov/asteroids/2005GO21/2005GO21_planning.html 2012-06-18 JPL Small-Body Database Search Engine: PHAs and H < 17 (mag) JPL Solar System Dynamics http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=pha;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ai;c1_op=%3C;c1_value=17;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsCkCqAi;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA 2011-11-20 last observation: 2012-06-17; arc: 7.21 years JPL Close-Approach Data: 308242 (2005 GO21) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21;cad=1#cad 2012-06-18 External links 308242 308242 2005GO21 308242 308242 (308242) 2005 GO 21 308242 308242 308242 308242 20120621 20050401