(471143) 2010 EK139 Precovery Images

(471143) 2010 EK139 Precovery Images


Only seven observations over an arc of four weeks were published in the original discovery announcement, so the initial orbit was very uncertain. Fortunately, the TNO was quite bright and a match to a one-night discovery from 2005 was made. With a revised orbit, images from SkyMorph were found on three nights in 2002-2003.

The following astrometry was submitted to the Minor Planet Center:

     K10ED9K  C2002 03 15.47677 12 31 53.00 -20 26 46.2          19.7 R      644
     K10ED9K  C2002 03 15.48764 12 31 52.99 -20 26 45.6          19.8 R      644
     K10ED9K  C2002 03 15.49846 12 31 52.96 -20 26 45.8          19.8 R      644
     K10ED9K  C2002 04 08.31825 12 29 57.29 -20 18 53.7          19.9 R      644
     K10ED9K  C2002 04 08.35411 12 29 57.11 -20 18 52.3          20.0 R      644
     K10ED9K  C2002 04 08.38506 12 29 57.01 -20 18 51.9          19.9 R      644
     K10ED9K  C2003 03 23.31235 12 35 16.34 -21 30 05.9          19.9 R      644
     K10ED9K  C2003 03 23.33332 12 35 16.20 -21 30 05.5          20.2 R      644
     K10ED9K  C2003 03 23.35431 12 35 16.11 -21 30 05.1          19.5 R      644
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 eight years instead of four weeks. 2010 EK139 was numbered on 2016-07-19.

View the Discovery Announcement. See also MPEC 2010-G50.


2003 March 23.33332 UTC
(Middle Exposure)

RA 12h35m16.20s Dec. -2130'05.5"

3 x 60-second exposures

Size = 150" x 150"

2002 April 8.35411 UTC
(Middle Exposure)

RA 12h29m57.11s Dec. -2018'52.3"

3 x 60-second exposures

Size = 150" x 150"

2002 March 15.48764 UTC
(Middle Exposure)

RA 12h31m52.99s Dec. -2026'45.6"

3 x 60-second exposures

Size = 150" x 150"


Original elements and residuals from the Minor Planet Center

2010 EK139

Epoch 2010 Mar. 25.0 TT = JDT 2455280.5                 MPC
M   0.04068              (2000.0)            P               Q
n   0.00337448     Peri.  219.30071     -0.83904880     +0.53899375
a  44.0215315      Node   352.16999     -0.24958312     -0.50226240
e   0.0812538      Incl.   32.92361     -0.48343084     -0.67617913
P 292              H    3.9           G   0.15
From 7 observations 2010 Mar. 13-Apr. 8.  E-assumed.


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

2010 EK139

Epoch 2010 July 23.0 TT = JDT 2455400.5                 MPC
M 342.29936              (2000.0)            P               Q
n   0.00170567     Peri.  284.84263     +0.04914832     +0.99192880
a  69.3753659      Node   346.26910     -0.61627661     -0.06197485
e   0.5321772      Incl.   29.50016     -0.78599465     +0.11061816
P 578              H    4.0           G   0.15           U   2

Residuals in seconds of arc
K023F  644  0.5-  0.4-    K033N  644  0.1-  0.0     K103D  304  0.0   0.0
K023F  644  0.1+  0.1+    K033N  644  0.1+  0.1+    K1045  304  0.3-  0.2-
K023F  644  0.4+  0.3-    K055C  644  0.3+  0.2+    K1045  304  0.1-  0.2-
K0248  644  0.4-  0.2-    K055C  644  0.3+  0.0     K1048  E85  0.1-  0.1+
K0248  644  0.5-  0.3+    K055C  644  0.0   0.5+    K1048  E85  0.1+  0.1+
K0248  644  0.3+  0.0     K103D  304  0.1+  0.1-
K033N  644  0.4+  0.0     K103D  304  0.1-  0.0


NEAT precovery images are from SkyMorph, which is a NASA Applied Information Systems Research (AISR) funded project.


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