(230965) 2004 XA192 Precovery Images

(230965) 2004 XA192 Precovery Images


The original orbit for this object was based on only three oppositions, so there was some uncertainty in the predicted position for old DSS images. Fortunately, two mutually-consistent images from 1989 were found 32" from the expected location.

Of some concern was the fact that the two images were not along the line-of-variation. In fact, the astrometry from the discovery night on December 12, 2004 is poor and created a significant error in the prediction in 1989 because of the small amount of current astrometry.

The following astrometry was submitted to the Minor Planet Center:

     K04XJ2A   1989 08 29.40000 01 52 19.25 +52 15 40.8                      261
     K04XJ2A   1989 10 04.32639 01 48 37.60 +52 29 51.3                      261
At the end of this page are the elements and residuals before and with the new data. The new orbit is much more accurate because the object has now been observed for 19 years instead of four years. 2004 XA192 was numbered on 2010-01-30.

View the Discovery Announcement. See also MPEC 2008-Y74.


1989 Oct. 04.32639 UTC

RA 01h48m37.60s Dec. +5229'51.3"

80-minute exposure

Size = 150" x 150"

Palomar Mountain-DSS plate XP197-A0VX

1989 Aug. 29.40000 UTC

RA 01h52m19.25s Dec. +5215'40.8"

60-minute exposure

Size = 150" x 150"

Palomar Mountain-DSS plate XJ197-A0AG


Original elements and residuals from the Minor Planet Center

2004 XA192

Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M 349.26051              (2000.0)            P               Q
n   0.00306197     Peri.  132.30940     -0.27085068     -0.90708252             T = 2458507.87328 JDT
a  46.9679552      Node   328.55321     +0.59572452     +0.10500585             q =    35.4658599
e   0.2448924      Incl.   38.14641     +0.75614298     -0.40764576
P 322              H    4.0           G   0.15           U   4
From 11 observations at 3 oppositions, 2004-2009, mean residual 0".32.
  
Residuals
20041212  644  0.1-  0.5+    20050313  644 (0.7-  3.0-)   20081221  695  0.0   0.2-
20041212  644  0.1+  0.4+    20051105  644  0.2-  0.7-    20081222  695  0.0   0.1-
20041212  644  0.1+  0.4+    20051105  644  0.2-  0.7-    20081231  H06  0.1-  0.4+
20050311  644  0.1+  0.3-    20081221  695  0.0   0.2-    20090101  H06  0.2+  0.4+


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

2004 XA192

Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M 349.35133              (2000.0)            P               Q
n   0.00306098     Peri.  132.15354     -0.26842963     -0.90781484             T = 2458479.34647 JDT
a  46.9781680      Node   328.55662     +0.59542935     +0.10656985             q =    35.4753729
e   0.2448541      Incl.   38.14570     +0.75723802     -0.40560459
P 322              H    4.0           G   0.15           U   3
From 13 observations at 4 oppositions, 1989-2009, mean residual 0".41.
  
Residuals
19890829  675  0.1+  0.1+    20050311  644  0.1-  0.0     20081221  695  0.1-  0.5-
19891004  675  0.2+  0.5-    20050313  644 (0.8-  2.7-)   20081222  695  0.1-  0.5-
20041212  644  0.0   1.0+    20051105  644  0.2-  0.4-    20081231  H06  0.2-  0.0
20041212  644  0.2+  0.9+    20051105  644  0.2-  0.3-    20090101  H06  0.1+  0.0
20041212  644  0.2+  0.9+    20081221  695  0.1-  0.6-


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


Back to TNO Precoveries