AstDyS 2012DR30 Ephemerides. Department of Mathematics, University of Pisa, Italy. [2017-02-14]. (原始内容存档于2019-02-14). (Distance to Sun [R] from first day of 2016 to first day of 2020. Assuming average apparent magnitude for 2017.)
AstDyS 2012DR30 Ephemerides. Department of Mathematics, University of Pisa, Italy. [2017-02-14]. (原始内容存档于2019-02-14). (Distance to Sun [R] from first day of 2016 to first day of 2020. Assuming average apparent magnitude for 2017.)