Asteroid: 2001 SL9

Predicted positions for POSS plates so883 and A1WK with length of trail in arcsecs. The predictor generates ephemerides for start, midth, and end of trail, along with the predicted magnitude.

     K01S09L   1954 11 27.18819 00 22 29.44 -30 20 05.2          17.8        261
     K01S09L   1954 11 27.19166 00 22 29.45 -30 20 10.2 so883    17.8        261
     K01S09L   1954 11 27.19513 00 22 29.47 -30 20 15.2          17.8        261
                        0.47"        -10.0"        10.0"

     K01S09L   1991 06 17.40486 19 59 16.72 +72 58 40.1          18.1        261
     K01S09L   1991 06 17.42396 19 59 10.83 +72 58 15.6 A07U     18.1        261
     K01S09L   1991 06 17.44305 19 59 04.95 +72 57 51.1          18.1        261
                      -51.68"        -49.0"        71.2"

Actually measured positions:

     K01S09L   1954 11 27.18819 00 26 55.85 -31 15 47.2 so883                261
     K01S09L   1954 11 27.19513 00 26 55.68 -31 15 57.0 so883                261
     K01S09L   1991 06 17.40486 20 04 51.02 +72 33 42.1 A07U                 261
     K01S09L   1991 06 17.44305 20 04 38.79 +72 32 57.3 A07U                 261

Note: The trail on POSS plate A07U was independently found by the ANEOPP team, who also found an additional trail in 1991, see MPEC below.

DSS image of 2001 SL9 from November 27, 1954 on POSS plate so883

DSS image of 2001 SL9 from June 17, 1991 on POSS plate A07U

Link to the MPEC which published the improved orbit.