MPEC 2020-A20 : 2017 WP28
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M.P.E.C. 2020-A20 Issued 2020 January 1, 21:24 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
2017 WP28
Revision to MPEC 2017-X4
Additional Observations:
K17W28P C2019 12 28.44198608 19 22.460+09 43 59.17 21.92wUEA020F51
K17W28P C2019 12 28.45402508 19 20.779+09 43 56.15 22.13wUEA020F51
K17W28P C2019 12 28.46601208 19 19.134+09 43 53.22 22.24wUEA020F51
K17W28P |C2019 12 30.23041 08 15 12.02 +09 36 40.1 21.8 GVEA020807
K17W28P |C2019 12 30.23605 08 15 11.16 +09 36 38.7 21.8 GVEA020807
K17W28P |C2019 12 30.24170 08 15 10.30 +09 36 36.8 21.8 GVEA020807
K17W28P KC2019 12 30.43701 08 14 41.28 +09 35 36.8 oEA020291
K17W28P KC2019 12 30.44391 08 14 40.25 +09 35 35.5 oEA020291
K17W28P KC2019 12 30.45084 08 14 39.20 +09 35 33.6 oEA020291
K17W28P pC2019 12 31.00081508 13 17.72 +09 33 16.6 22.1 GVEA020L01
K17W28P pC2019 12 31.00554008 13 17.04 +09 33 16.2 22.1 GVEA020L01
K17W28P pC2019 12 31.01026208 13 16.34 +09 33 15.3 21.9 GVEA020L01
K17W28P |C2020 01 01.16581 08 10 17.87 +09 28 50.1 21.8 GVEA020807
K17W28P |C2020 01 01.17144 08 10 16.96 +09 28 48.7 21.9 GVEA020807
K17W28P |C2020 01 01.17708 08 10 16.04 +09 28 47.6 21.9 GVEA020807
K17W28P C2020 01 01.58691608 09 09.750+09 27 00.26 21.8 GVEA020F51
K17W28P C2020 01 01.60049708 09 07.490+09 26 57.17 22.5 GVEA020F51
Observer details:
291 LPL/Spacewatch II. Observer T. H. Bressi. 1.8-m f/2.7 reflector + CCD.
807 Cerro Tololo Observatory, La Serena. Observers T. Linder, R. Holmes.
1.00-m f/10.0 astrograph + CCD.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, T. Lowe, A. Schultz, M.
Willman, K. Chambers. Measurers K. Chambers, S. Chastel, T. de Boer, L.
Denneau, J. Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier, Y.
Ramanjooloo, R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
L01 Visnjan Observatory, Tican. Observer K. Korlevic. 1.0-m f/2.9 reflector +
CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
191228 F51 7.41- 2.98- 200101 F51 7.92- 3.29- MPO425795 -12.3 days
Orbital elements:
2017 WP28 Earth MOID = 0.1059 AU
Epoch 2020 May 31.0 TT = JDT 2459000.5 Veres
M 31.95064 (2000.0) P Q
n 0.77318784 Peri. 6.53442 -0.00937985 +0.98473731
a 1.1756536 Node 263.02813 -0.92518531 -0.07448969
e 0.8009522 Incl. 10.08383 -0.37939974 +0.15730132
P 1.27 H 20.8 G 0.15 U 5
Residuals in seconds of arc
171127 G96 0.2+ 0.2+ 171127 I52 0.5+ 0.1+ 191230 807 0.4+ 0.4+
171127 G96 0.1- 0.1- 171127 I52 0.0 0.0 191230 807 0.2+ 0.4+
171127 G96 0.2- 0.2- 171127 I52 0.9- 0.0 191230 807 0.0 0.1-
171127 G96 0.1- 0.0 171127 K51 0.1+ 0.1+ 191230 291 1.2- 0.3-
171127 H01 0.1- 0.1- 171127 K51 0.2+ 0.2- 191230 291 1.1- 0.1+
171127 H01 0.1- 0.1- 171127 K51 0.1+ 0.0 191230 291 1.1- 0.1-
171127 H01 0.2- 0.1- 171128 V06 0.1+ 0.1- 191231 L01 0.2- 0.2-
171127 H01 0.1+ 0.1- 171128 V06 0.1- 0.1- 191231 L01 0.5+ 0.5+
171127 926 0.1- 0.0 171128 V06 0.2+ 0.2- 191231 L01 1.0+ 0.7+
171127 926 0.0 0.1- 171128 V06 0.4+ 0.3- 200101 807 0.0 0.1-
171127 926 0.2- 0.2- 171201 H21 0.1- 0.5+ 200101 807 0.0 0.2-
171127 V06 0.1- 0.2- 171201 H21 0.2+ 0.7+ 200101 807 0.1- 0.0
171127 V06 0.1+ 0.1- 171201 H21 0.1+ 0.9+ 200101 F51 0.2+ 0.2-
171127 V06 0.1+ 0.3+ 191228 F51 0.2+ 0.0 200101 F51 0.1- 0.0
171127 V06 0.0 0.2- 191228 F51 0.1- 0.0
171127 I52 0.0 0.2- 191228 F51 0.2+ 0.1+
Ephemeris:
2017 WP28 a,e,i = 1.18, 0.80, 10 q = 0.2340
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2019 12 02 08 48 47.1 +12 00 28 1.2062 1.8803 117.8 27.6 23.8
...
2019 12 17 08 38 38.3 +10 37 38 0.9595 1.7937 134.7 23.0 23.1
...
2019 12 25 08 26 27.8 +09 59 07 0.8411 1.7412 145.1 18.9 22.6
...
2019 12 31 08 13 17.9 +09 33 24 0.7611 1.6987 153.5 15.0 22.2
2020 01 01 08 10 43.8 +09 29 23 0.7487 1.6913 154.9 14.3 22.1
2020 01 02 08 08 03.1 +09 25 26 0.7365 1.6839 156.3 13.6 22.1
...
2020 01 08 07 49 35.0 +09 03 13 0.6697 1.6376 164.1 9.5 21.6
...
2020 01 16 07 18 39.7 +08 36 41 0.5994 1.5714 165.6 8.9 21.3
...
2020 01 31 06 07 55.7 +07 52 39 0.5332 1.4316 139.2 26.7 21.4
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