MPEC 1999-N21: 1999 AN10
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M.P.E.C. 1999-N21 Issued 1999 July 12, 21:23 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 ISSN 1523-6714
1999 AN10
Revision to MPEC 1999-K07
Observations:
J99A10N 5 1955 01 26.40208 08 38 25.08 +72 39 45.7 675
J99A10N 5 1955 01 26.43333 08 37 35.21 +72 40 05.4 675
J99A10N 5 1955 01 26.43750 08 37 26.05 +72 40 07.3 675
J99A10N 5 1955 01 26.44583 08 37 13.24 +72 40 11.7 675
Observer details:
675 Palomar Mountain. Earlier trail located and measured by A. Gnadig and
A. Doppler. Later trail measured (and earlier trail remeasured) by
G. V. Williams. 1.2-m Oschin Schmidt.
Orbital elements:
1999 AN10 PHA 0.015A
Epoch 1999 Aug. 10.0 TT = JDT 2451400.5 Williams
M 70.04961 (2000.0) P Q
n 0.55941450 Peri. 268.25229 -0.56757144 +0.68457751
a 1.4587479 Node 314.55304 -0.21820270 -0.66076120
e 0.5621418 Incl. 39.93185 -0.79388302 -0.30781206
P 1.76 H 18.0 G 0.15 U 2
Residuals in seconds of arc
550126 675 3.1- 0.3+ 990123 071 0.1+ 0.0 990214 587 0.9- 0.2-
550126 675 6.5+ 2.0+ 990124 046 0.4+ 0.0 990214 587 0.3+ 0.2+
550126 675 3.4- 1.7+ 990124 046 0.4+ 0.1- 990215 046 0.5- 0.3-
550126 675 1.4+ 1.7+ 990124 046 0.0 0.3- 990215 046 0.3+ 0.6+
990113 704 1.2+ 0.8+ 990124 046 0.8+ 0.3- 990215 046 0.1+ 0.6+
990113 704 (0.1+ 2.5-) 990124 658 0.3+ 0.6- 990215 046 0.3+ 0.5+
990113 704 0.6- 0.5- 990124 658 0.1- 0.3- 990218 104 0.1+ 1.0-
990113 704 0.4+ 0.4+ 990124 658 0.3+ 0.6- 990218 587 0.0 1.0+
990113 704 1.9- 0.1- 990126 071 0.4+ 0.4+ 990218 587 0.8- 0.2-
990114 557 0.2- 0.5- 990126 071 (0.2- 2.8+) 990218 587 0.6+ 0.7+
990114 557 0.0 0.0 990126 402 0.5+ 0.7+ 990218 587 1.0+ 0.7-
990115 046 0.1+ 0.0 990126 402 0.2- 0.3+ 990220 428 0.8+ 0.7-
990115 046 0.0 0.2+ 990126 402 0.5+ 0.7+ 990220 428 1.0+ 1.4-
990115 046 0.3- 0.5- 990126 360 0.4+ 0.3+ 990515 426 0.7- 0.2+
990115 046 0.1- 0.2- 990126 360 0.1- 0.6+ 990515 426 0.2- 0.4-
990115 046 0.3- 0.1+ 990126 360 0.4+ 0.4+ 990515 426 0.5- 0.2+
990115 587 0.8+ 0.7+ 990127 587 0.4- 0.0 990516 426 0.8- 0.2-
990115 587 0.0 1.0+ 990127 587 0.2- 0.4- 990516 426 1.3- 0.1-
990116 704 0.6+ 0.4- 990130 402 0.8+ 0.6+ 990516 426 0.8- 0.7+
990116 704 0.2+ 0.0 990130 402 0.1+ 0.2- 990523 426 1.7- 0.2-
990116 704 0.7- 0.3+ 990130 402 0.2+ 0.3- 990523 426 1.6- 0.5+
990116 704 0.3+ 0.6+ 990204 402 0.3+ 0.1- 990526 950 0.3- 0.6+
990117 046 0.0 0.0 990204 402 0.1+ 0.1- 990526 950 0.5+ 0.1+
990117 046 0.2+ 0.3- 990207 587 0.5+ 0.1- 990526 950 0.8- 0.2-
990117 046 0.0 0.1+ 990207 587 0.8+ 0.3+ 990527 950 0.3+ 1.3+
990117 046 0.1+ 0.0 990207 587 0.6+ 0.5- 990527 950 0.0 1.2+
990117 402 0.4- 0.1+ 990208 704 (0.9+ 2.8+) 990609 675 0.3+ 0.6+
990117 402 0.1- 0.1- 990208 704 0.6+ 0.3+ 990609 675 0.1+ 0.6+
990117 402 0.4- 0.1+ 990208 704 0.4- 0.8+ 990609 675 0.1+ 0.7+
990117 540 0.6- 0.3+ 990208 704 0.2- 0.0 990609 675 0.1+ 0.6+
990117 540 0.5- 0.1+ 990208 704 0.6- 0.7+ 990609 675 0.1+ 0.6+
990117 540 2.0- 0.1+ 990208 900 0.2- 0.0 990609 675 0.1+ 0.6+
990119 151 0.8- 0.3- 990208 900 0.4+ 0.4- 990620 046 0.9- 1.9-
990119 151 0.6+ 0.1+ 990208 402 0.0 0.4- 990702 413 0.4+ 1.1+
990119 151 3.3- 1.4+ 990208 402 0.1+ 0.8- 990708 587 0.4- 1.4-
990119 587 0.1+ 0.1- 990208 402 0.4+ 0.8- 990708 658 0.1- 0.8-
990119 587 0.2- 0.1+ 990209 360 0.5+ 0.0 990708 658 0.2+ 0.1-
990121 046 0.0 0.3- 990209 360 0.7+ 0.3+ 990708 658 0.7+ 0.2+
990121 046 0.5+ 0.2- 990209 360 0.4+ 0.2+ 990709 658 0.1- 0.5+
990121 046 0.1+ 0.1- 990212 587 0.0 0.8+ 990709 658 0.7- 0.7+
990121 587 0.2- 0.5- 990212 587 0.1+ 0.8- 990709 658 0.6+ 0.4+
990121 587 0.1- 0.3- 990212 587 0.1+ 0.2-
990123 071 0.0 0.1+ 990214 587 0.4- 0.1+
Ephemeris:
1999 AN10 a,e,i = 1.46, 0.56, 40 q = 0.6387
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1999 07 11 01 00.58 +31 25.4 1.096 1.393 82.4 46.4 20.7
1999 07 21 00 57.23 +37 29.3 1.082 1.474 89.2 43.6 20.7
1999 07 31 00 48.15 +43 13.5 1.070 1.551 96.1 40.6 20.7
1999 08 10 00 31.51 +48 22.8 1.064 1.624 102.8 37.5 20.7
1999 08 20 00 05.90 +52 32.2 1.066 1.692 109.0 34.4 20.7
1999 08 30 23 32.06 +55 13.2 1.080 1.756 114.3 31.6 20.7
1999 09 09 22 54.25 +56 05.3 1.107 1.816 118.3 29.2 20.8
1999 09 19 22 19.32 +55 11.0 1.150 1.872 120.5 27.6 20.9
1999 09 29 21 52.54 +52 58.1 1.208 1.924 120.8 26.6 21.0
1999 10 09 21 35.38 +50 02.4 1.280 1.972 119.3 26.2 21.2
1999 10 19 21 26.86 +46 54.5 1.366 2.016 116.3 26.3 21.4
1999 10 29 21 25.15 +43 55.2 1.462 2.057 112.4 26.5 21.6
1999 11 08 21 28.54 +41 15.8 1.567 2.094 107.7 26.8 21.8
1999 11 18 21 35.77 +39 01.9 1.679 2.127 102.7 27.0 22.0
A trail of 1999 AN10 was located and measured by A. Gnadig and A. Doppler
on the Digital Sky Survey (DSS) copy of a 45-min red-exposure Palomar Sky
Survey I (PSS) plate. Gnadig and Doppler remarked on the difficulty of their
trail measurement. Examination of the DSS shows an extremely weak image. In
view of this, it was decided to remeasure the trail from the PSS prints, as
well as measuring the corresponding trail from the 12-min blue-exposure plate.
Extracts from the two prints were scanned and the resulting images were
measured. The r.m.s. of the fit of 25-30 USNO-A2.0 comparison stars was 0".22.
As examination of the residual block above shows, the trail-end measures are
clearly not consistent at the subarcsecond level, partly because of the poor
definition of the trail ends and partly because the times of exposure of the
PSS plates were recorded only to the nearest minute. The apparent better
agreement of the start of the first trail with the second-trail measures
is presumably fortuitous.
Computations by B. G. Marsden and G. V. Williams show that the miss
distance on 2027 Aug. 7.3 UT will be 0.0026 AU. The subsequent revolution
period of a little over 1.74 years precludes the possibility of any further
significant approach to the earth until Feb. 2076, when the miss distance
can be expected to be less than 0.05 AU (although it cannot be as small
as 0.008 AU).
Gareth V. Williams (C) Copyright 1999 MPC M.P.E.C. 1999-N21
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