Asteroid: 1999 GK4

Predicted positions for POSS plate 0AVI with length of trail in arcsecs and pixel. The predictor generates ephemerides for start, midth, and end of trail, along with the predicted magnitude. 

     J99G04K   1955 04 21.25625 12 39 17.64 +01 57 17.9 0AVI     18.0        675
     J99G04K   1955 04 21.27361 12 39 16.19 +01 57 30.7 0AVI     18.0        675
     J99G04K   1955 04 21.29097 12 39 14.74 +01 57 43.4 0AVI     18.0        675
                      -43.41"         25.5"        50.3"
                      -25.54p         15.0p        29.6p

Actually measured positions, start and end of trail 

Observations:
     J99G04K 5 1955 04 21.25625 12 37 38.18 +02 03 46.3                      675
     J99G04K 5 1955 04 21.29097 12 37 35.24 +02 04 13.0                      675
Predicted positions for UK-Schmidt plate 06RX with length of trail in arcsecs and pixel. The predictor generates ephemerides for start, midth, and end of trail, along with the predicted magnitude. 
     J99G04K   1988 02 23.66297 14 03 59.72 -09 41 09.2 06RX     19.5        413
     J99G04K   1988 02 23.70464 14 04 00.82 -09 41 05.6 06RX     19.5        413
     J99G04K   1988 02 23.74630 14 04 01.92 -09 41 02.1 06RX     19.5        413
                       32.61"          7.1"        33.4"
                       19.18p          4.2p        19.6p

Actually measured positions, start and end of trail 

Observations:
     J99G04K 5 1988 02 23.66297 14 03 38.79 -09 39 35.2                      413
     J99G04K 5 1988 02 23.74630 14 03 40.70 -09 39 28.4                      413
Link to the MPEC which published the improved orbit.

DSS image of 1999 GK4 from April 21, 1955 on POSS plate 0AVI

DSS image of 1999 GK4 from February 2, 1988 on UK-Schmidt plate 06RX