2007 UK126 Precovery Images

2007 UK126 Precovery Images


Within a day of the announcement of discovery of this scattered-disk object, Rob Matson found images from 2001-2002 in the SkyMorph database. The extended arc of observations allowed me to find five DSS images of 2007 UK126 as early as 1982.

The following astrometry was submitted to the Minor Planet Center:

     K07UC6K   1982 08 16.76843 02 13 50.71 -10 50 56.0                      260
     K07UC6K   1982 11 07.55427 02 10 07.58 -11 25 56.0                      260
     K07UC6K   1993 09 23.70708 02 53 32.78 -08 12 55.4                      260
     K07UC6K   1993 11 07.57343 02 50 57.83 -08 31 13.3                      260
     K07UC6K   1997 09 30.72490 03 09 43.23 -06 59 39.2                      260 
At the end of this page are the elements and residuals before and with the new data, also incorporating Rob's SkyMorph astrometry. The new orbit is much more accurate because the object has now been observed for over 25 years instead of thirteen months.

View the Discovery Announcement.


1997 Sep. 30.72490 UTC

RA 03h09m43.23s Dec. -0659'39.2"

60-minute exposure

Size = 150" x 150"

Siding Spring Observatory-DSS plate ER689-A2OW

1993 Nov. 07.57343 UTC

RA 02h50m57.83s Dec. -0831'13.3"

50-minute exposure

Size = 150" x 150"

Siding Spring Observatory-DSS plate ER687-A2OV

1993 Sep. 23.70708 UTC

RA 02h53m32.78s Dec. -0812'55.4"

60-minute exposure

Size = 150" x 150"

Siding Spring Observatory-DSS plate sr0688

1982 Nov. 07.55427 UTC

RA 02h10m07.58s Dec. -1125'56.0"

60-minute exposure

Size = 255" x 255"

Siding Spring Observatory-DSS plate S686-012H

1982 Aug. 16.76843 UTC

RA 02h13m50.71s Dec. -1050'56.0"

60-minute exposure

Size = 255" x 255"

Siding Spring Observatory-DSS plate S685-03YP


Original elements and residuals from the Minor Planet Center

2007 UK126

Epoch 2008 May 14.0 TT = JDT 2454600.5                  MPC
M 337.24268              (2000.0)            P               Q
n   0.00163651     Peri.  345.71151     -0.46647173     -0.83253724
a  71.3166152      Node   131.11066     +0.84549653     -0.51892387
e   0.4675918      Incl.   23.36519     +0.25988410     +0.19390661
P 602              H    4.0           G   0.15           U   4
From 19 observations at 2 oppositions, 2006-2008.

Residuals
20061205  675  0.1-  0.2-    20071020  675  0.1+  0.4+    20071203  675  0.1-  0.1-
20061205  675  0.2-  0.5+    20071020  675  0.3-  0.4+    20071203  675  0.1+  0.2-
20061212  675  0.1+  0.2-    20071113  675  0.4+  0.1+    20071203  675  0.0   0.3-
20061212  675  0.1+  0.3-    20071113  675  0.2-  0.3+    20080114  675  0.1-  0.5-
20061212  675  0.2+  0.1-    20071113  675  0.1+  0.0     20080115  675  0.0   0.0
20071019  675  0.2-  0.2+    20071114  675  0.1+  0.0
20071019  675  0.1-  0.3+    20071203  675  0.1+  0.3-


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

2007 UK126

Epoch 2008 May 14.0 TT = JDT 2454600.5                  MPC
M 338.03117              (2000.0)            P               Q
n   0.00157985     Peri.  346.69967     -0.48029424     -0.82457742             T = 2468506.13362 JDT
a  73.0116111      Node   131.07984     +0.83666008     -0.53302693             q =    37.5321613
e   0.4859426      Incl.   23.36794     +0.26328189     +0.18961639
P 624              H    3.5           G   0.15           U   2
From 41 observations at 7 oppositions, 1982-2008, mean residual 0".27.
  
Residuals
19820816  413  0.1+  0.1-    20021010  644  0.0   0.1-    20071019  675  0.1-  0.3+
19821107  413  0.3-  0.3+    20021010  644  0.1+  0.3-    20071020  675  0.1+  0.4+
19930923  413  0.2+  0.1-    20021028  644  0.1+  0.0     20071020  675  0.3-  0.4+
19931107  413  0.2+  0.3-    20021028  644  0.2-  0.5-    20071113  675  0.4+  0.0
19970930  413  0.1-  0.5+    20021028  644  0.0   0.2-    20071113  675  0.3-  0.2+
20011214  644  0.2-  0.2-    20021106  644  0.1+  0.2+    20071113  675  0.0   0.0
20011214  644  0.0   0.2-    20021106  644  0.1+  0.1+    20071114  675  0.1+  0.0
20021005  644  0.2+  0.2-    20021106  644  0.4-  0.1-    20071203  675  0.0   0.5-
20021005  644  0.1-  0.3-    20061205  675  0.1+  0.3+    20071203  675  0.2-  0.2-
20021005  644  0.5-  0.1+    20061205  675  0.0   0.9+    20071203  675  0.1+  0.3-
20021006  644  0.6+  0.3+    20061212  675  0.2+  0.3+    20071203  675  0.0   0.4-
20021006  644  0.1+  0.1+    20061212  675  0.1+  0.2+    20080114  675  0.1-  0.8-
20021006  644  0.3-  0.2-    20061212  675  0.2+  0.3+    20080115  675  0.0   0.3-
20021010  644  0.1+  0.1+    20071019  675  0.2-  0.2+

1982-1997 DSS astrometry by Andrew Lowe
2001-2002 SkyMorph astrometry by Rob Matson


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


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