(120178) 2003 OP32 Precovery Images

(120178) 2003 OP32 Precovery Images


Only a single usable precovery image, from July 21, 1990, of (120178) 2003 OP32 was found in the image archives. Consequently, it was important to confirm that the identification was real.

The first chart shows the predicted position in 1990, along with its one-sigma uncertainty in position. The animated GIF below shows the image of the object on July 21, 1990 on the first GIF, but the same image is missing on the second GIF taken two months later. The image aligns with the extrapolated line of uncertainty, and confirms that the image belongs to (120178) 2003 OP32. Here is the position submitted to the Minor Planet Center:

C0178          1990 07 21.33438 19 50 14.78 +04 31 11.6                      261
At the end of this page are the elements and residuals for (120178) 2003 OP32 before and after the new astrometry. The new orbit is much more accurate because the object has now been observed for 15 years instead of four years.

View the Discovery Announcement.


Predicted position of (120178) 2003 OP32

July 21, 1990 at 7:34 UTC

Chart size = 120" x 120"

One-sigma uncertainty in position is shown

Courtesy of Lowell Observatory's ASTFINDER

Actual position of (120178) 2003 OP32

DSS plate "XJ811 A0NS" 55-minute exposure from Palomar Observatory

Size = 120" x 120"

Note that the actual image is about 20" to the west (right) of the prediction


Original elements and residuals from the Minor Planet Center

(120178) 2003 OP32

Epoch 2007 Oct. 27.0 TT = JDT 2454400.5                 MPC
M  58.01095              (2000.0)            P               Q
n   0.00345133     Peri.   70.41639     -0.29122861     +0.95635989             T = 2437592.18973 JDT
a  43.3656097      Node   182.97497     -0.95508032     -0.28924033             q =    38.6581051
e   0.1085539      Incl.   27.17046     +0.05484046     +0.04142215
P 286              H    4.1           G   0.15           U   3
From 39 observations at 5 oppositions, 2001-2005, mean residual 0".46.
  
Residuals
20010601  608  0.5+  0.8-    20020709  644  0.3-  0.3+    20030726  675  0.1+  0.9+
20010812  644  0.2+  0.6-    20020709  644  0.6-  0.2+    20030726  675  0.4+  0.8+
20010812  644  0.5+  0.4-    20020709  644  0.6-  0.2+    20030726  675  0.3+  0.7+
20010812  644  0.2-  0.3+    20020719  644  0.0   0.0     20030728  608  0.9+  0.4-
20010818  644  0.2+  0.4-    20020719  644  0.3+  0.2+    20030810  675  1.1-  0.6- Y
20010818  644  0.6-  0.4-    20020719  644  0.0   0.1+    20030830  675  1.2-  0.3- Y
20010818  644  0.5-  0.6-    20020825  644  0.3+  0.4+    20040922  675  0.3+  0.0
20010923  644  0.1+  0.2+    20020825  644  0.1+  0.1+    20040922  675  0.7+  0.2+
20010923  644  0.1-  0.2+    20020825  644  0.1+  0.1-    20040922  675  0.3+  0.2+
20020622  644  0.1-  0.3+    20020921  644  0.6+  0.0     20050807  J95  0.3+  0.0
20020622  644  0.0   0.1+    20020921  644  0.5+  0.1+    20050807  J95  0.1-  0.3-
20020622  644  0.6-  0.3+    20020921  644  0.4+  0.2-    20050901  143  0.4+  0.4-
20020701  644  0.4+  0.3+    20021018  644  0.9-  0.4+    20050903  143  1.3-  0.4+


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

(120178) 2003 OP32

Epoch 2007 Oct. 27.0 TT = JDT 2454400.5                 MPC
M  58.08350              (2000.0)            P               Q
n   0.00344982     Peri.   70.23962     -0.29414919     +0.95546528             T = 2437563.81011 JDT
a  43.3782456      Node   182.97686     -0.95419322     -0.29215684             q =    38.6321055
e   0.1094129      Incl.   27.16964     +0.05469509     +0.04159891
P 286              H    4.1           G   0.15           U   3
From 40 observations at 6 oppositions, 1990-2005, mean residual 0".48.
  
Residuals
19900721  675  0.1-  0.6-    20020709  644  0.3-  0.3+    20030726  675  0.1+  0.8+
20010601  608  0.8+  0.7-    20020709  644  0.7-  0.3+    20030726  675  0.1+  0.7+
20010812  644  0.5+  0.5-    20020709  644  0.7-  0.3+    20030728  608  0.7+  0.4-
20010812  644  0.8+  0.3-    20020719  644  0.1-  0.1+    20030810  675  1.4-  0.6- Y
20010812  644  0.1+  0.4+    20020719  644  0.2+  0.3+    20030830  675  1.5-  0.3- Y
20010818  644  0.5+  0.2-    20020719  644  0.0   0.1+    20040922  675  0.0   0.1-
20010818  644  0.3-  0.2-    20020825  644  0.2+  0.4+    20040922  675  0.4+  0.1+
20010818  644  0.2-  0.5-    20020825  644  0.1-  0.1+    20040922  675  0.0   0.0
20010923  644  0.4+  0.4+    20020825  644  0.0   0.0     20050807  J95  0.4+  0.1-
20010923  644  0.2+  0.4+    20020921  644  0.5+  0.1+    20050807  J95  0.0   0.5-
20020622  644  0.1-  0.4+    20020921  644  0.4+  0.2+    20050901  143  0.3+  0.6-
20020622  644  0.1-  0.2+    20020921  644  0.3+  0.2-    20050903  143  1.3-  0.2+
20020622  644  0.6-  0.3+    20021018  644  1.1-  0.4+
20020701  644  0.4+  0.3+    20030726  675  0.1-  0.9+


DSS precovery images are from DSS plate archive scans, which are copyright California Institute of Technology.


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