MPEC 1999-A20 : 1999 AF4
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M.P.E.C. 1999-A20 Issued 1999 Jan. 12, 15:42 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Commission 20 of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html
1999 AF4
Observations:
J99A04F C1998 10 19.08668 23 34 48.93 +39 21 22.6 19.8 704
J99A04F C1998 10 19.10696 23 34 46.61 +39 21 32.8 20.0 704
J99A04F C1998 10 19.16762 23 34 39.61 +39 21 59.7 19.7 704
J99A04F* C1999 01 09.17975 02 27 24.73 +34 25 47.0 17.7 704
J99A04F C1999 01 09.19027 02 27 30.10 +34 25 23.8 18.3 704
J99A04F C1999 01 09.20088 02 27 35.59 +34 25 02.0 17.8 704
J99A04F C1999 01 09.21142 02 27 40.93 +34 24 38.5 17.8 704
J99A04F C1999 01 09.22209 02 27 46.43 +34 24 15.9 18.0 704
J99A04F C1999 01 10.44686 02 38 37.21 +33 40 33.0 17.3 R 422
J99A04F C1999 01 10.45098 02 38 39.29 +33 40 23.4 17.2 R 422
J99A04F C1999 01 10.45216 02 38 39.95 +33 40 20.6 17.0 R 422
J99A04F C1999 01 10.45287 02 38 40.32 +33 40 19.5 17.1 R 422
J99A04F C1999 01 10.45353 02 38 40.62 +33 40 17.8 16.8 R 422
J99A04F C1999 01 10.74819 02 41 19.48 +33 28 10.9 16.9 R 540
J99A04F C1999 01 10.75167 02 41 21.28 +33 28 03.4 540
J99A04F C1999 01 10.75358 02 41 22.29 +33 27 58.9 540
J99A04F C1999 01 10.75971 02 41 25.49 +33 27 44.5 540
J99A04F C1999 01 10.76145 02 41 26.61 +33 27 40.4 540
J99A04F C1999 01 11.00219 02 43 35.71 +33 18 31.3 15.7 R 758
J99A04F C1999 01 11.00391 02 43 36.55 +33 18 28.0 15.5 R 758
J99A04F C1999 01 11.00564 02 43 37.49 +33 18 23.4 15.9 R 758
J99A04F C1999 01 11.00726 02 43 38.32 +33 18 19.2 15.7 R 758
J99A04F C1999 01 11.01359 02 43 41.56 +33 18 05.2 15.3 R 758
J99A04F C1999 01 11.05624 02 44 04.83 +33 16 14.2 16.0 R 713
J99A04F C1999 01 11.06662 02 44 10.24 +33 15 49.8 16.0 R 713
J99A04F C1999 01 11.07419 02 44 14.16 +33 15 35.9 17.8 704
J99A04F C1999 01 11.08487 02 44 19.69 +33 15 12.1 17.8 704
J99A04F C1999 01 11.09598 02 44 25.54 +33 14 45.6 18.1 704
J99A04F C1999 01 11.10718 02 44 31.36 +33 14 18.5 17.7 704
J99A04F C1999 01 11.11818 02 44 36.94 +33 13 52.5 17.9 704
J99A04F C1999 01 11.73608 02 50 09.35 +32 48 41.0 16.4 R 046
J99A04F C1999 01 11.73681 02 50 09.66 +32 48 38.7 046
J99A04F C1999 01 12.08366 02 53 14.80 +32 34 26.5 15.8 R 758
J99A04F C1999 01 12.08762 02 53 16.96 +32 34 15.6 16.1 R 758
J99A04F C1999 01 12.10069 02 53 23.88 +32 33 41.1 16.2 R 758
J99A04F C1999 01 12.44241 02 56 27.94 +32 19 45.8 17.1 R 422
J99A04F C1999 01 12.44558 02 56 29.56 +32 19 37.6 17.0 R 422
J99A04F C1999 01 12.44907 02 56 31.35 +32 19 28.8 17.1 R 422
J99A04F C1999 01 12.45117 02 56 32.46 +32 19 22.8 16.9 R 422
Observer details:
046 Klet. Observer M. Tichy. 0.57-m f/5.2 reflector + CCD.
422 Loomberah. Observer G. J. Garradd. 0.45-m f/5.4 reflector + CCD.
540 Linz. Observers E. Meyer, E. Obermair. 0.3-m f/5.2 Schmidt-Cassegrain
+ CCD.
704 Lincoln Laboratory ETS, New Mexico. Observers M. Blythe, F. Shelly,
M. Bezpalko. Measurers J. Stuart, H. Viggh, R. Sayer. 1.0-m f/2.15
reflector + CCD.
713 Thornton. Observer R. A. Koff. 0.20-m f/10 Schmidt-Cassegrain + CCD.
758 BCC Observatory, Cocoa. Observer I. P. Griffin. 0.30-m f/5 Maksutov
+ CCD.
Orbital elements:
1999 AF4
Epoch 1999 Jan. 22.0 TT = JDT 2451200.5 Williams
M 4.40731 (2000.0) P Q
n 0.20759567 Peri. 154.68614 -0.00480588 -0.98038331
a 2.8248183 Node 295.05786 +0.87649998 +0.09072393
e 0.6173123 Incl. 12.56307 +0.48137791 -0.17497922
P 4.75 H 18.3 G 0.15 U 7
From 37 observations 1998 Oct. 19-1999 Jan. 12, mean residual 0".44.
Ephemeris:
1999 AF4 a,e,i = 2.82, 0.62, 13 q = 1.0810
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1999 01 12 02 52.51 +32 37.9 0.199 1.091 117.9 52.8 16.9
1999 01 17 03 37.15 +28 39.5 0.198 1.101 121.9 49.3 16.8
1999 01 22 04 19.54 +24 00.2 0.204 1.115 125.6 45.8 16.8
1999 01 27 04 57.63 +19 12.5 0.217 1.133 128.6 42.8 16.9
1999 02 01 05 30.65 +14 45.6 0.237 1.153 130.6 40.4 17.1
1999 02 06 05 58.81 +10 56.0 0.262 1.177 131.7 38.7 17.3
1999 02 11 06 22.81 +07 48.6 0.293 1.203 132.1 37.5 17.5
1999 02 16 06 43.45 +05 20.5 0.328 1.231 131.9 36.7 17.8
1999 02 21 07 01.48 +03 25.7 0.367 1.262 131.3 36.1 18.1
1999 02 26 07 17.50 +01 57.6 0.410 1.294 130.5 35.6 18.4
1999 03 03 07 31.96 +00 50.2 0.455 1.328 129.4 35.2 18.7
1999 03 08 07 45.21 -00 01.3 0.504 1.363 128.1 35.0 18.9
1999 03 13 07 57.52 -00 40.8 0.556 1.399 126.6 34.8 19.2
1999 03 18 08 09.12 -01 11.6 0.611 1.436 125.0 34.6 19.4
1999 03 23 08 20.18 -01 36.1 0.669 1.474 123.3 34.4 19.7
1999 03 28 08 30.81 -01 56.6 0.730 1.513 121.4 34.3 19.9
1999 04 02 08 41.08 -02 14.3 0.793 1.552 119.5 34.1 20.2
1999 04 12 09 00.80 -02 45.9 0.928 1.631 115.3 33.7 20.6
1999 04 22 09 19.73 -03 17.4 1.072 1.711 110.9 33.3 21.0
1999 05 02 09 38.08 -03 52.4 1.226 1.791 106.2 32.7 21.4
1999 05 12 09 55.95 -04 32.6 1.388 1.871 101.4 31.9 21.7
1999 05 22 10 13.43 -05 18.6 1.557 1.951 96.5 31.0 22.0
Gareth V. Williams (C) Copyright 1999 MPC M.P.E.C. 1999-A20
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