MPEC 2001-M18 : 1998 HL1
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M.P.E.C. 2001-M18 Issued 2001 June 20, 17:10 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.
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
1998 HL1
Revision to MPEC 1998-H12
Observations:
J98H01L C2001 06 19.13187 23 12 02.64 +37 26 44.5 20.4 V 493
J98H01L C2001 06 19.13265 23 12 02.83 +37 26 46.1 493
J98H01L C2001 06 19.13336 23 12 03.01 +37 26 47.5 493
J98H01L C2001 06 19.13553 23 12 03.52 +37 26 51.9 493
J98H01L C2001 06 19.13624 23 12 03.69 +37 26 53.4 493
J98H01L C2001 06 19.13699 23 12 03.87 +37 26 55.2 493
J98H01L C2001 06 20.05122 23 15 49.76 +37 57 53.0 493
J98H01L C2001 06 20.05301 23 15 50.17 +37 57 56.3 493
Observer details:
493 Calar Alto. Observers DANEOPS Team (M. Busch, A. Seib, F. Hormuth).
Measurers R. Stoss, A. Gnadig, A. Doppler. 1.52-m reflector + CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc, reference and Delta-T
010619 493 23.4- 10.0+ 010620 493 23.5- 9.9+ MPC 32326 +0.0070 day
Orbital elements:
1998 HL1 PHA 0.037D
Epoch 2001 Apr. 1.0 TT = JDT 2452000.5 Spahr
M 255.48635 (2000.0) P Q
n 0.70847097 Peri. 148.40345 +0.98178157 -0.00707705
a 1.2462007 Node 213.64019 -0.01447351 +0.99361762
e 0.1870941 Incl. 20.04517 +0.18946101 +0.11257861
P 1.39 H 19.1 G 0.15 U 3
Residuals in seconds of arc
980418 704 0.7+ 1.0- 980420 557 0.2+ 0.4- 980502 696 0.3- 0.3+
980418 704 1.8+ 0.1+ 980420 557 0.5- 1.0+ 980504 402 0.1+ 1.5-
980418 704 0.2- 0.7- 980420 557 1.0+ 0.8- 980504 402 0.7+ 0.4-
980418 704 1.0- 0.6- 980421 704 1.8+ 1.1+ 980504 402 0.6- 1.5-
980419 704 0.1- 0.1+ 980421 704 1.3+ 0.8+ 980519 557 0.1+ 0.9+
980419 704 0.1+ 0.1+ 980421 704 1.3+ 0.8+ 980613 658 0.3- 0.7-
980419 704 1.5- 0.7+ 980421 704 0.6+ 0.8+ 980613 658 2.0- 0.3-
980419 704 0.3- 1.3+ 980421 704 1.0+ 0.3+ 980613 658 0.8- 0.3-
980419 704 0.2- 2.0- 980421 704 0.0 0.2- 980626 711 0.3+ 0.5+
980419 557 0.4- 0.3+ 980421 704 0.1+ 0.4+ 980626 711 0.6+ 0.3+
980419 557 0.4- 2.8- 980421 704 0.0 0.5+ 980627 711 0.5+ 0.3+
980419 557 0.7- 0.3+ 980421 704 0.6- 0.4+ 980627 711 0.3+ 0.3+
980419 557 0.1+ 2.6- 980422 046 0.5- 0.4- 980727 696 0.2+ 1.0-
980420 402 0.2- 0.9+ 980422 046 0.0 0.4+ 980727 696 0.4+ 0.1-
980420 402 0.3+ 1.4- 980423 046 0.3- 0.4+ 980727 696 0.4+ 0.1-
980420 402 1.2- 0.7+ 980423 046 0.6- 0.7- 010619 493 0.0 0.1+
980420 104 1.1- 0.1+ 980423 046 0.5- 0.5+ 010619 493 0.0 0.1+
980420 104 0.1- 0.3- 980423 557 0.4- 0.4+ 010619 493 0.1+ 0.0
980420 104 0.2+ 0.6+ 980423 557 0.3+ 0.6+ 010619 493 0.0 0.1-
980420 046 0.3- 0.3+ 980430 557 0.7+ 1.8+ 010619 493 0.0 0.0
980420 046 0.3+ 0.1+ 980430 557 1.4+ 0.0 010619 493 0.0 0.2+
980420 046 0.6- 0.0 980502 696 0.3- 0.3+ 010620 493 0.2+ 0.2+
980420 046 0.2- 0.4+ 980502 696 0.2- 0.1+ 010620 493 0.1- 0.2-
Ephemeris:
1998 HL1 a,e,i = 1.25, 0.19, 20 q = 1.0130
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2001 06 10 22 36.54 +31 54.0 0.623 1.146 85.2 62.0 20.6
2001 06 20 23 15.60 +37 56.2 0.608 1.119 83.0 64.4 20.5
2001 06 30 23 59.47 +43 01.3 0.598 1.093 80.7 66.7 20.5
2001 07 10 00 48.85 +46 50.9 0.590 1.069 78.6 68.7 20.5
2001 07 20 01 43.33 +49 09.2 0.583 1.049 76.8 70.5 20.5
2001 07 30 02 40.83 +49 42.6 0.576 1.033 75.4 72.0 20.5
2001 08 09 03 38.08 +48 25.8 0.568 1.021 74.5 73.1 20.5
2001 08 19 04 31.81 +45 24.5 0.561 1.015 74.2 73.7 20.5
2001 08 29 05 19.93 +40 51.8 0.553 1.013 74.4 73.8 20.4
2001 09 08 06 02.02 +35 05.5 0.547 1.017 75.3 73.3 20.4
2001 09 18 06 38.50 +28 24.8 0.543 1.026 76.7 72.3 20.4
2001 09 28 07 10.04 +21 08.0 0.540 1.040 78.6 70.8 20.3
2001 10 08 07 37.38 +13 31.8 0.540 1.059 81.0 68.8 20.3
2001 10 18 08 01.03 +05 50.9 0.541 1.080 83.7 66.4 20.3
2001 10 28 08 21.17 -01 42.6 0.544 1.105 86.7 63.8 20.3
2001 11 07 08 37.92 -08 59.4 0.546 1.132 90.0 61.1 20.2
2001 11 17 08 51.06 -15 52.6 0.549 1.160 93.6 58.3 20.2
2001 11 27 09 00.14 -22 14.9 0.550 1.189 97.3 55.4 20.2
2001 12 07 09 04.62 -27 59.1 0.550 1.219 101.3 52.4 20.2
2001 12 17 09 03.72 -32 55.8 0.548 1.248 105.5 49.5 20.1
2001 12 27 08 56.90 -36 50.1 0.546 1.276 109.7 46.5 20.1
2002 01 06 08 44.35 -39 25.0 0.545 1.303 114.0 43.6 20.0
2002 01 16 08 27.43 -40 22.1 0.545 1.329 118.0 40.8 20.0
2002 01 26 08 09.15 -39 29.5 0.548 1.354 121.4 38.4 20.0
2002 02 05 07 53.13 -36 51.3 0.558 1.376 123.8 36.5 20.0
2002 02 15 07 42.08 -32 47.0 0.575 1.397 124.7 35.6 20.1
2002 02 25 07 37.30 -27 47.5 0.601 1.416 123.9 35.5 20.2
2002 03 07 07 38.62 -22 26.4 0.637 1.432 121.5 36.2 20.4
2002 03 17 07 45.23 -17 11.0 0.683 1.446 117.8 37.5 20.6
2002 03 27 07 56.20 -12 21.1 0.738 1.457 113.4 38.9 20.8
2002 04 06 08 10.56 -08 08.0 0.800 1.467 108.5 40.3 21.0
2002 04 16 08 27.54 -04 36.1 0.869 1.473 103.5 41.5 21.3
2002 04 26 08 46.52 -01 46.2 0.943 1.478 98.5 42.3 21.5
2002 05 06 09 06.95 +00 24.2 1.019 1.479 93.7 42.9 21.7
2002 05 16 09 28.47 +01 58.4 1.098 1.478 88.9 43.1 21.8
2002 05 26 09 50.78 +03 00.4 1.176 1.475 84.3 43.1 22.0
2002 06 05 10 13.64 +03 34.1 1.254 1.469 80.0 42.8 22.1
Timothy B. Spahr (C) Copyright 2001 MPC M.P.E.C. 2001-M18
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