(202421) 2005 UQ₅₁₃ Precovery Images

This bright TNO was discovered in 2005 and reobserved during the 2006 and 2007 apparitions. The three-opposition orbit was quite uncertain for searching for images on archival plates from the 1990s. Fortunately, 2005 UQ₅₁₃ was also predicted to be on NEAT scans from 2001 and 2002 when the uncertainty was smaller, and images were found on seven nights. Stacking of the individual scans from each night helped to show the object more clearly.

With an updated orbit from the 2001 and 2002 astrometry, additional images were found in DSS data from 1990-1992.

The following astrometry was submitted to the Minor Planet Center:

     K05Up3Q   1990 09 15.30174 23 11 22.52 +16 37 06.8                      261
     K05Up3Q   1991 10 03.25035 23 13 14.70 +17 08 00.1                      261
     K05Up3Q   1992 09 26.28194 23 16 43.07 +17 49 15.8                      261
     K05Up3Q  C2001 08 22.34931 23 48 12.85 +23 37 07.8          20.5 R      644
     K05Up3Q  C2001 09 21.27441 23 46 08.72 +23 30 37.2          20.4 R      644
     K05Up3Q  C2001 09 26.20079 23 45 47.49 +23 28 42.4          19.7 R      644
     K05Up3Q  C2001 09 30.44927 23 45 29.37 +23 26 55.1          19.9 R      644
     K05Up3Q  C2002 08 22.47770 23 51 36.89 +24 13 41.9          19.6 R      644
     K05Up3Q  C2002 10 15.19649 23 47 52.99 +23 56 51.3          21.2 R      644
     K05Up3Q  C2002 11 01.10292 23 46 53.79 +23 47 25.0          20.5 R      644

View the Discovery Announcement.

	2002 Aug. 22.47770 UTC RA 23h51m36.89s Dec. +24°13'41.9" 3 x 60-second exposure stack Size = 150" x 150" Palomar Mountain/NEAT
	2001 Sep. 26.20079 UTC RA 23h45m47.49s Dec. +23°28'42.4" 3 x 20-second exposure stack Size = 150" x 150" Palomar Mountain/NEAT
	1992 Sep. 26.28194 UTC RA 23h16m43.07s Dec. +17°49'15.8" 70-minute exposure Size = 150" x 150" Palomar Mountain-DSS plate XJ677-A16P
	1991 Oct. 03.25035 UTC RA 23h13m14.70s Dec. +17°08'00.1" 65-minute exposure Size = 150" x 150" Palomar Mountain-DSS plate XJ604-A0OO
	1990 Sep. 15.30174 UTC RA 23h11m22.52s Dec. +16°37'06.8" 75-minute exposure Size = 150" x 150" Palomar Mountain-DSS plate XP676-A0YI

Revised elements and residuals from the Minor Planet Center (new astrometry is shown in red)

Epoch 2007 Oct. 27.0 TT = JDT 2454400.5                 MPC
M 212.70038              (2000.0)            P               Q
n   0.00346286     Peri.  222.55095     -0.93244179     -0.11252150             T = 2496937.51325 JDT
a  43.2692767      Node   307.64850     +0.31031071     -0.73618066             q =    36.9070977
e   0.1470369      Incl.   25.69947     -0.18509342     -0.66736568
P 285              H    3.7           G   0.15           U   3
From 42 observations at 8 oppositions, 1990-2007, mean residual 0".31.
  
Residuals
19900915  675  0.4+  0.2+    20051022  644  0.1-  0.2+    20051130  644  0.0   0.1+
19911003  675  0.2-  0.1+    20051022  644  0.2+  0.2-    20051130  644  0.0   0.1+
19920926  675  0.3-  0.0     20051023  644  0.2+  0.1+    20060915  644  0.5+  0.1-
20010822  644  0.3-  0.3-    20051023  644  0.4+  0.1-    20060916  644  0.1+  0.2+
20010921  644  0.1+  0.2+    20051023  644  0.2+  0.2+    20060916  644  0.2-  0.5-
20010926  644  0.1+  0.6-    20051024  644  0.2+  0.1+    20060923  644  0.1-  0.3+
20010930  644  0.1+  0.2-    20051024  644  0.3+  0.2+    20060925  644  0.0   0.0
20020822  644  0.2-  0.1+    20051024  644  0.2+  0.1+    20060926  644  0.1-  0.1+
20021015  644  0.9-  0.5+    20051026  644  0.3+  0.1+    20071006  A74  0.0   0.4+
20021101  644  0.3+  0.1+    20051026  644  0.3+  0.0     20071006  A74  0.1-  0.4+
20051021  644  0.5+  0.2-    20051026  644  0.5+  0.0     20071006  A74  0.4-  1.0+
20051021  644  0.3+  0.1-    20051104  644  0.2-  0.3-    20071031  A74  0.4-  0.4-
20051021  644  0.3-  0.2-    20051104  644  0.2-  0.3-    20071031  A74  0.3-  0.2-
20051022  644  0.1+  0.1-    20051104  644  0.2-  0.3-    20071031  A74  0.8-  0.6-