Formerly 1981 WC (our 1996 MC).
Last updated 11/19/97
This was the MPC's latest report after the end of October, 1997.
This was how we learned that the asteroid now had a permanent number!
(7992) 1981 WC Epoch 1997 Dec. 18.0 TT = JDT 2450800.5 Williams M 16.66599 (2000.0) P Q n 0.18253477 Peri. 306.53567 +0.96934945 -0.19460516 a 3.0777900 Node 65.12035 +0.24246571 +0.85625390 e 0.3313230 Incl. 9.51525 -0.03964886 +0.47849566 P 5.40 H 13.1 G 0.15 U 2 From 44 observations at oppositions, 1981-1997, mean residual 0".89.Orbital elements from MPC 30850.
Note that we've gone from three to four oppositions!
We supplied two more positions in August. Perhaps another
observation was found between the 1981 and our recovery in 1996.
1981 WC Epoch 1997 Dec. 18.0 TT = JDT 2450800.5 Williams M 16.66590 (2000.0) P Q n 0.18253475 Peri. 306.53547 +0.96934879 -0.19460609 a 3.0777902 Node 65.12062 +0.24246799 +0.85625309 e 0.3313229 Incl. 9.51542 -0.03965083 +0.47849673 P 5.40 H 13.0 G 0.15 U 2 From 32 observations at 4 oppositions, 1981-1997, mean residual 0".90.Orbital elements from MPC 30650.
I believe this includes our recovery observations:
1981 WC Epoch 1997 June 1.0 TT = JDT 2450600.5 Williams M 340.18101 (2000.0) P Q n 0.18242343 Peri. 306.50467 +0.96942043 -0.19424194 a 3.0790421 Node 65.12982 +0.24214966 +0.85635534 e 0.3315419 Incl. 9.51529 -0.03984445 +0.47846171 P 5.40 H 13.0 G 0.15 From 28 observations at 3 oppositions, 1981-1997, mean residual 0".73.Orbital elements from MPC 30287.
With planetary perturbations since 1996 (but not including our recovery
observations).
1981 WC Epoch 1997 June 1.0 TT = JDT 2450600.5 (M-v) Williams M 340.19576 (2000.0) P Q n 0.18242676 Peri. 306.50244 +0.96942392 -0.19421550 a 3.0790047 Node 65.13056 +0.24213201 +0.85635924 e 0.3316342 Incl. 9.51598 -0.03986669 +0.47846544 P 5.40 H 13.0 G 0.15 U 4From 27 observations at 2 oppositions, 1981-1996. Ref. MPC 27566.
NOTE: 1981 WC = 1996 MC 1981 WC Epoch 1996 Nov. 13.0 TT = JDT 2450400.5 (M-v) Williams M 303.72466 (2000.0) P Q n 0.18236441 Peri. 306.51178 +0.96924964 -0.19499486 a 3.0797064 Node 65.16744 +0.24287302 +0.85618341 e 0.3320908 Incl. 9.52048 -0.03959586 +0.47846313 P 5.40 H 13.0 G 0.15 U 4From 27 observations at 2 oppositions, 1981-1996. Ref. MPC 27566.
