Based on MPC 69-day arc (looks like an earlier observation from December 1998 was tied to our data):
1999 BC3 Epoch 1999 Jan. 22.0 TT = JDT 2451200.5 Williams M 44.48054 (2000.0) P Q n 0.15064593 Peri. 239.23487 +0.49762904 -0.86738912 a 3.4980911 Node 180.92442 +0.81915790 +0.47041415 e 0.0421430 Incl. 4.28253 +0.28521162 +0.16231647 P 6.54 H 13.5 G 0.15 U 5 From 28 observations 1998 Dec. 15-1999 Feb. 22, mean residual 0".57. Orbital elements from MPEC 1999-D15.
Based on MPC 21-day arc:
1999 BC3 Epoch 1999 Jan. 22.0 TT = JDT 2451200.5 Williams M 34.14352 (2000.0) P Q n 0.15030705 Peri. 250.44916 +0.31891007 -0.94778416 a 3.5033469 Node 180.95646 +0.89515273 +0.30163206 e 0.0389681 Incl. 4.27990 +0.31144496 +0.10355331 P 6.56 H 13.7 G 0.15 From 21 observations 1999 Jan. 19-Feb. 15.
Based on a twenty-day arc, fit by Find_orb (just our observations).
Orbital elements: 1999 BC3 Perihelion 1998 Mar 30.217852 TT Epoch 1999 Jan 22.0 TT = JDT 2451200.5 M 44.85525 (2000.0) P Q n 0.15063109 Peri. 238.82421 0.50357749 -0.86394919 a 3.4983208 Node 180.94143 0.81590329 0.47603861 e 0.0420855 Incl. 4.28271 0.28409775 0.16425295 P 6.54 H 13.0 G 0.15 q 3.3510924 >From 12 observations 1999 Jan. 19-Feb. 8; RMS error 1.225 arcseconds
Based on a six-day arc, fit by Find_orb:
Orbital elements: 1999 BC3 Perihelion 1999 Oct 8.787585 TT Epoch 1999 Jan 22.0 TT = JDT 2451200.5 M 323.56061 (2000.0) P Q n 0.14026608 Peri. 335.47421 -0.91774360 -0.39717075 a 3.6686050 Node 181.12739 0.37545901 -0.86637527 e 0.1486109 Incl. 4.21509 0.12952693 -0.30273633 P 7.03 H 13.2 G 0.15 q 3.1234103 From 9 observations 1999 Jan. 19-25; RMS error 0.533 arcseconds
From a four-day arc (they did not use our Sunday astrometry, perhaps because one of the two observations was flagged as involved with a star.
1999 BC3 Epoch 1999 Jan. 2.0 TT = JDT 2451180.5 Williams M 315.24346 (2000.0) P Q n 0.13144236 Peri. 352.83767 -0.98902408 -0.14774410 a 3.8310029 Node 178.66234 +0.13900690 -0.93441820 e 0.2232377 Incl. 4.29709 +0.05008454 -0.32408997 P 7.50 H 13.5 G 0.15 From 8 observations 1999 Jan. 19-23. E-assumed. Orbital elements from MPEC 1999-B20.
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