AstDyS-2
Asteroids - Dynamic Site
AstDyS ∴ Objects ∴ 2009ER21 ∴ Observational info
Contact »
(312540) 2009ER21  ▹ 
OBSERVATIONAL INFORMATION
◲
Arc information
Arc length 7812.82 days
Unobserved 299 days

 

Astrometry summary
Optical
RMS of residuals 0.58
First observation 2002-02-07.389
Last observation 2023-06-30.213
Number (Discarded) 489 (48)

 

Get the observational details
ASCII file

 

Note: The ASCII file is in a format suitable for OrbFit input.