(175113) 2004 PF115 Precovery Images

(175113) 2004 PF115 Precovery Images


The initial discovery of 2004 PF115 was announced in MPEC 2007-R03, then followed up five days later with 2007 astrometry in MPEC 2007-R29. Additional 2002 astrometry from the NEAT archives added a third opposition.

Although 2004 PF115 had been observed on only eight nights, the span of observations covered five years. The orbit was sufficiently accurate to find two DSS images from 1992 and 1994.

Additional images from the 1970s may exist in the DSS database, but these plates are not online. Moreover, 2004 PF115 was closer to the summer Milky Way and interference with background stars may be a problem.

The following astrometry was submitted to the Minor Planet Center:

     K04PB5F   1992 06 04.70509 20 39 56.05 -27 24 29.6                      260
     K04PB5F   1994 07 03.67016 20 50 28.58 -27 20 26.2                      260
At the end of this page are the elements and residuals before and with the new data. The new orbit was much more accurate because the object had now been observed for 15 years instead of five years, and consequently 2004 PF115 was numbered in January of 2008.

View the Discovery Announcement.


1994 July 03.67016 UTC

RA 20h50m28.58s Dec. -2720'26.2"

60-minute exposure

Size = 150" x 150"

Siding Spring Observatory-DSS plate XS529-A1L6

1992 June 04.70509 UTC

RA 20h39m56.05s Dec. -2724'29.6"

60-minute exposure

Size = 150" x 150"

Siding Spring Observatory-DSS plate XS528-A0I3


Original elements and residuals from the Minor Planet Center

2004 PF115

Epoch 2007 Oct. 27.0 TT = JDT 2454400.5                 MPC
M 150.04408              (2000.0)            P               Q
n   0.00403351     Peri.   87.31816     -0.96298555     -0.14105236             T = 2417201.13682 JDT
a  39.0853317      Node    84.50034     +0.03650338     -0.91255015             q =    36.5198916
e   0.0656369      Incl.   13.34208     +0.26706991     -0.38387036
P 244              H    4.7           G   0.15           U   4
From 15 observations at 3 oppositions, 2002-2007, mean residual 0".24.
  
Residuals
20020729  644  0.3+  0.1-    20020915  644  0.1+  0.3+    20040923  644  0.0   0.1+
20020819  644  0.1+  0.0     20040807  644  0.0   0.2-    20070805  675  0.1-  0.3+
20020830  644  0.2-  0.1-    20040807  644  0.1+  0.2-    20070805  675  0.3+  0.4+
20020830  644  0.3+  0.3-    20040807  644  0.1-  0.2-    20070806  675  0.1+  0.4-
20020830  644  0.5-  0.5+    20040923  644  0.1+  0.1+    20070806  675  0.4-  0.1-


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

(175113) 2004 PF115
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5                 MPC
M 150.13238              (2000.0)            P               Q
n   0.00403368     Peri.   87.23981     -0.96279401     -0.14234833             T = 2417180.78804 JDT
a  39.0842530      Node    84.50153     +0.03773149     -0.91250217             q =    36.5200956
e   0.0656059      Incl.   13.34226     +0.26758930     -0.38350585
P 244              H    4.7           G   0.15           U   2
From 17 observations at 5 oppositions, 1992-2007, mean residual 0".23.
  
Residuals
19920604  413  0.0   0.1-    20020830  644  0.5-  0.4+    20040923  644  0.1+  0.1+
19940703  413  0.0   0.2+    20020915  644  0.1+  0.2+    20070805  675  0.1-  0.4+
20020729  644  0.3+  0.2-    20040807  644  0.1+  0.2-    20070805  675  0.3+  0.5+
20020819  644  0.1+  0.1-    20040807  644  0.1+  0.2-    20070806  675  0.1+  0.4-
20020830  644  0.3-  0.1-    20040807  644  0.1-  0.2-    20070806  675  0.4-  0.0
20020830  644  0.2+  0.4-    20040923  644  0.1+  0.1+


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


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