2007 OR10 Precovery Images

2007 OR10 Precovery Images


This scattered-disk object had been observed at only four oppositions, so the identification of two images from DSS in 1985 and 1991 was significant. The 1985 plate from the European Southern Observatory, La Silla, has an unusually long exposure of 120 minutes, and the object's motion can be seen during this interval; the length of the trail is 3.5" in position angle 255 (to the right and slightly down).

The following astrometry was submitted to the Minor Planet Center:

     K07O10R   1985 08 19.19084 21 52 39.47 -21 37 43.0                      262
     K07O10R   1991 10 01.47296 21 57 30.24 -19 52 51.6                      260
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 23 years instead of seven years.

View the Discovery Announcement.


1991 Oct. 01.47296 UTC

RA 21h57m30.24s Dec. -1952'51.6"

60-minute exposure

Size = 150" x 150"

Siding Spring Observatory-DSS plate XS601-A09K

1985 Aug. 19.19084 UTC

RA 21h52m39.47s Dec. -2137'43.0"

120-minute exposure

Size = 150" x 150"

European Southern Observatory, La Silla-DSS plate sr0600


Original elements and residuals from the Minor Planet Center

2007 OR10

Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M  99.50811              (2000.0)            P               Q
n   0.00178403     Peri.  207.39988     -0.97192239     +0.12323562             T = 2399223.41252 JDT
a  67.3288112      Node   336.86787     +0.07947214     -0.62990016             q =    33.6802976
e   0.4997640      Incl.   30.67980     -0.22147471     -0.76683686
P 552              H    1.9           G   0.15           U   5
From 33 observations at 4 oppositions, 2001-2008, mean residual 0".34.
  
Residuals
20010827  644  0.1+  0.1-    20070721  675  0.2-  0.1-    20080617  675  0.4-  0.1-
20020811  644  0.5-  0.4+    20070808  675  0.3-  0.1-    20080703  675  0.3-  0.0
20020818  644  0.5-  0.1+    20070808  675  0.1-  0.6-    20080703  675  0.1-  0.6+
20020819  644  0.4+  0.4+    20070808  675  0.1-  0.2-    20080704  675  0.1-  0.2-
20020819  644  0.0   0.7-    20070905  675  0.4+  0.3-    20080704  675  0.5-  0.0
20020915  644  0.3+  0.3-    20070905  675  0.2+  0.0     20080806  675  0.2-  0.3+
20020915  644  0.1-  0.5+    20071015  675  0.2-  0.0     20080806  675  0.1+  0.4+
20070717  675  0.5+  0.7-    20071016  675  0.3-  0.0     20080808  675  0.3-  0.4-
20070717  675  0.6+  0.3+    20071016  675  0.3-  0.2-    20080808  675  0.1+  0.1-
20070718  675  0.9+  0.3+    20080612  675  0.2-  0.1-    20080823  807  0.5+  0.1+
20070718  675  0.3+  0.7+    20080616  675  0.2-  0.0     20080823  807  0.5+  0.3+


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

2007 OR10

Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M  99.23212              (2000.0)            P               Q
n   0.00178184     Peri.  207.49984     -0.97170631     +0.12493134             T = 2399309.79622 JDT
a  67.3839297      Node   336.86795     +0.07837038     -0.63004077             q =    33.6618563
e   0.5004468      Incl.   30.67954     -0.22281141     -0.76644686
P 553              H    1.9           G   0.15           U   4
From 35 observations at 6 oppositions, 1985-2008, mean residual 0".35.
  
Residuals
19850819  809  0.2-  0.4+    20070718  675  0.3+  0.7+    20080617  675  0.4-  0.0
19911001  413  0.1+  0.6-    20070721  675  0.3-  0.1-    20080703  675  0.3-  0.0
20010827  644  0.2+  0.0     20070808  675  0.3-  0.2-    20080703  675  0.1-  0.6+
20020811  644  0.5-  0.4+    20070808  675  0.1-  0.6-    20080704  675  0.0   0.1-
20020818  644  0.5-  0.1+    20070808  675  0.2-  0.2-    20080704  675  0.4-  0.0
20020819  644  0.4+  0.4+    20070905  675  0.4+  0.3-    20080806  675  0.1-  0.3+
20020819  644  0.1+  0.7-    20070905  675  0.1+  0.1-    20080806  675  0.1+  0.4+
20020915  644  0.4+  0.2-    20071015  675  0.3-  0.1-    20080808  675  0.3-  0.4-
20020915  644  0.0   0.6+    20071016  675  0.3-  0.1-    20080808  675  0.1+  0.0
20070717  675  0.4+  0.8-    20071016  675  0.3-  0.2-    20080823  807  0.5+  0.2+
20070717  675  0.6+  0.3+    20080612  675  0.2-  0.1-    20080823  807  0.5+  0.3+
20070718  675  0.8+  0.2+    20080616  675  0.2-  0.0


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


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