Asteroid: 1999 YN4

Predicted positions for POSS blue plate so114 with length of trail in arcsecs. The predictor generates ephemerides for start, midth, and end of trail, along with the predicted magnitude.

     J99Y04N   1954 01 04.12014 01 19 44.28 +52 01 58.9 so114     19.0       261
     J99Y04N   1954 01 04.12431 01 19 44.82 +52 01 51.7 so114     19.0       261
     J99Y04N   1954 01 04.12847 01 19 45.37 +52 01 44.4 so114     19.0       261
                       10.04"        -14.5"        17.6"

Actually measured positions, start and end of trail.

     J99Y04N   1954 01 04.12014 01 20 15.33 +52 03 58.3                      261
     J99Y04N   1954 01 04.12847 01 20 16.41 +52 03 44.3                      261

Predicted positions for ESO Schmidt plate 483 with length of trail in arcsecs. The predictor generates ephemerides for start, midth, and end of trail, along with the predicted magnitude.

     J99Y04N T 1974 02 23.09317 08 35 50.81 -65 15 07.5 ESO 483    17.8      262
     J99Y04N T 1974 02 23.11400 08 35 44.60 -65 15 33.8 ESO 483    17.8      262
     J99Y04N T 1974 02 23.13484 08 35 38.39 -65 16 00.0 ESO 483    17.8      262
                      -77.95"        -52.5"        94.0"

Actually measured positions, start and end of trail, as well as calculated mid exposure position. The exposure data ( start,end and length) of ESO - Plate 483 are uncertain. The given exposure length is 60 minutes. The trail fits well with an assumed exposure length of 43 minutes (1974 02 23.099 until 23.129)

     J99Y04N T 1974 02 23.09317 08 36 33.77 -65 21 59.9 ESO 483              262
     J99Y04N T 1974 02 23.11400 08 36 29.02 -65 22 17.7 ESO 483              262
     J99Y04N T 1974 02 23.13484 08 36 24.26 -65 22 35.5 ESO 483              262

Link to the M.P.E.C. which published the improved orbit.

DSS image of 1999 YN4 from January 4, 1954 on POSS blue plate so114

DSS image of 1999 YN4 from Febuary 23, 1974 on ESO Schmidt plate 483