MPEC 2021-H117 : 2016 WW9
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M.P.E.C. 2021-H117 Issued 2021 April 22, 14:01 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Division F 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 https://www.minorplanetcenter.net/ ISSN 1523-6714
2016 WW9
Revision to MPEC 2016-X4
Additional Observations:
K16W09W C2011 10 17.37885501 21 31.213+46 55 09.78 21.70GVEH117F51
K16W09W C2011 10 17.46568101 21 21.797+46 55 06.79 22.37GVEH117F51
K16W09W C2011 10 21.39594601 14 19.229+46 49 10.55 22.11GVEH117F51
K16W09W C2011 10 24.35926301 08 51.297+46 39 21.67 21.53GVEH117F51
K16W09W C2011 10 24.37141201 08 49.917+46 39 18.92 22.09GVEH117F51
K16W09W C2011 12 09.26913200 12 35.022+36 25 53.02 20.71GVEH117F51
Observer details:
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, K. Chambers, T. Lowe, A.
Schultz, I. Smith. Measurers S. Chastel, M. Huber, Y. Ramanjooloo, R.
Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc, reference and Delta-T
111017 F51 7.6+ 5.2+ 111209 F51 4.2+ 6.2+ MPO409572 -0.01 days
Orbital elements:
2016 WW9 PHA, Earth MOID = 0.0132 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 293.19994 (2000.0) P Q
n 0.20639459 Peri. 218.56759 -0.85725198 -0.39390846
a 2.8357667 Node 295.13073 +0.51424387 -0.68741577
e 0.6893766 Incl. 21.48546 -0.02592849 -0.61016037
P 4.78 H 18.9 G 0.15 U 0
Residuals in seconds of arc
111017 F51 0.2- 0.2+ 161129 300 (1.7+ 0.4+) 161210 204 0.3- 0.2-
111017 F51 0.1- 0.2- 161129 C43 0.1- 0.3+ 161210 204 0.4- 0.2-
111021 F51 0.5+ 0.2- 161129 C43 0.4- 0.3+ 161210 204 0.2- 0.2-
111024 F51 0.3- 0.1+ 161129 C43 0.1+ 0.1+ 161217 300 1.3+ 0.2-
111024 F51 0.1- 0.3+ 161129 Z99 1.0- 0.2+ 161217 300 1.0+ 0.6+
111209 F51 0.4- 0.3+ 161129 Z99 0.8- 0.0 161217 300 (1.9+ 0.8+)
161016 F51 0.4- 0.0 161129 Z99 0.8+ 0.1+ 161217 300 0.5+ 0.1+
161016 F51 0.1+ 0.1+ 161129 C47 0.6- 0.2- 161218 160 1.5+ 0.1+
161016 F51 0.1+ 0.0 161129 C47 0.3- 0.3+ 161218 160 0.3+ 0.3-
161127 F51 0.0 0.2- 161129 C47 0.0 0.2- 161218 160 0.7+ 0.5-
161127 F51 0.0 0.1- 161129 C47 0.2- 0.2- 161218 290 0.2+ 0.1-
161127 F51 0.1- 0.2- 161130 Z21 0.4+ 0.4+ 161218 290 0.1+ 0.1-
161127 F51 0.1- 0.2- 161130 Z21 0.6- 0.1+ 161218 290 0.1+ 0.1-
161127 033 0.0 0.0 161130 Z21 0.4- 0.2+ 161218 290 0.0 0.1+
161127 033 0.1- 0.0 161130 Z21 0.2- 0.6+ 161218 926 0.2+ 0.7+
161127 033 0.0 0.0 161130 Z21 0.1+ 0.1- 161218 926 0.1- 0.8+
161128 033 0.0 0.0 161130 Z21 0.0 0.5- 161218 926 0.2- 0.5+
161128 033 0.1- 0.0 161130 Z21 0.3- 0.1- 161220 W25 0.6+ 0.7-
161128 033 0.8- 0.6+ 161130 I52 0.3- 0.3- 161220 W25 0.2- 0.3-
161128 033 0.1- 0.0 161130 I52 0.1- 0.4- 161222 W25 0.2+ 0.3+
161128 033 0.0 0.0 161130 I52 0.3- 0.3- 161222 W25 0.6- 0.8+
161128 033 0.1- 0.0 161130 I52 0.3- 0.2- 161227 291 0.2- 0.3+
161128 118 0.9+ 0.4- 161130 926 0.1- 0.0 161227 291 0.4- 0.1+
161128 118 0.4+ 0.2- 161130 926 0.2- 0.1+ 161227 291 0.2- 0.1+
161128 118 0.5+ 0.3- 161130 926 0.2+ 0.1- 170228 474 0.2+ 0.1-
161128 C43 (0.6+ 1.7-) 161202 I52 0.2+ 0.1+ 170228 474 0.1+ 0.4+
161128 C43 0.1- 0.5- 161202 I52 0.1+ 0.0 170228 474 0.1+ 0.5-
161128 C43 1.0+ 0.3+ 161202 I52 0.1- 0.1- 170327 807 0.3- 1.4+
161128 K61 0.4+ 0.2+ 161202 I52 0.0 0.0 170327 807 0.1- 0.4+
161128 K61 0.5+ 0.1+ 161206 K38 0.3- 0.4- 170426 807 0.3+ 0.3-
161128 K61 0.4+ 0.3+ 161206 K38 0.0 0.4- 170426 807 0.1+ 0.2-
161129 J95 0.3- 0.1- 161206 K38 0.3- 0.2- 170426 807 0.0 0.1-
161129 J95 0.2- 0.2- 161206 K38 0.1+ 0.2- 170501 807 0.2- 0.0
161129 J95 0.2- 0.2- 161206 K38 0.2- 0.3- 170501 807 0.1+ 0.3-
161129 300 0.3+ 0.9+ 161207 G40 0.2- 0.2- 170501 807 0.2+ 0.9-
161129 300 0.3+ 0.9+ 161207 G40 0.1- 0.3-
161129 300 1.3+ 1.1+ 161207 G40 0.5- 0.2-
Ephemeris:
2016 WW9 a,e,i = 2.84, 0.69, 21 q = 0.8809
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 03 23 00 36 20.0 +21 17 20 3.6161 2.7134 21.5 7.7 24.4
...
2021 04 07 00 59 57.3 +23 19 24 3.5444 2.6011 16.6 6.3 24.2
...
2021 04 15 01 13 20.9 +24 28 37 3.4921 2.5395 15.5 6.1 24.1
...
2021 04 21 01 23 47.0 +25 21 56 3.4467 2.4925 15.5 6.2 24.0
2021 04 22 01 25 33.4 +25 30 55 3.4386 2.4846 15.5 6.2 24.0
2021 04 23 01 27 20.3 +25 39 55 3.4304 2.4767 15.6 6.3 24.0
...
2021 04 29 01 38 15.0 +26 34 22 3.3784 2.4288 16.4 6.7 24.0
...
2021 05 07 01 53 24.9 +27 47 46 3.3019 2.3638 18.1 7.6 23.9
...
2021 05 22 02 23 58.4 +30 05 19 3.1382 2.2386 22.7 10.0 23.8
A. U. Tomatic (C) Copyright 2021 MPC M.P.E.C. 2021-H117
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