Hi all,

I have made these measurements to find out if
they line up with those of C/2000 C4 and C/2005 W1.

They do!

Here is my solution with Exorb:

2000/ 2/ 5 JD=2451579.6633321 (ref. J2000.0) File: 0C45W111.POS
Equat. Pos. & Vel. Ecliptic Oscul. Elements
(Gm, km/s) (deg, AU)
Itr: 3 Converged sw= 3.9276E-03°
e : 0.98523409 s= 3.1E-07 X0 : -1.36030723E+00 s= 1.9E-04
i : 25.04239088 s= 7.5E-04 Y0 : 5.88954295E+00 s= 9.9E-05
w : 22.76945588 s= 1.8E-03 Z0 : 3.80444939E+00 s= 1.0E-04
Nod: 80.73058663 s= 1.4E-03 Vx0: -1.70477579E+02 s= 1.7E-03
a : 3.23325159 s= 7.9E-07 Vy0: -7.27811118E+01 s= 2.2E-03
M0: 359.99941813 s= 3.3E-06 Vz0: 5.02876030E+01 s= 2.3E-03
Rj0: -2.75887E-08 DataPoints: 121 Time Span: 4180.750 d
A1: 9.44827685E-10 M. Motion: 0.1695293215 s= 6.2E-08
A2: -4.53255273E-09 Perih Dist : 0.04774189 s= 9.8E-07
A3: 0.00000000E+00 Perih Long : 103.50004251 s=-3.0E-04
AF: 1.11000000E-01 Period (JY): 5.81390 s= 2.1E-06
Perih Time : 0.00343 s= 7.6E-04

Minimum earth distance will be 2011 July 31 with 0.84 au (r = 0.557 au)
The comet will then be in Leo moving with 7"/min in RA and 3"/min in Decl,
elongation from sun ~34 deg, I think this is a bit too difficult.

Orbital Elements for epoch 2455800.5 (2011 Aug 27) with A1 = +0.0945, A2 =
-0.4533

Ecliptic Osculating Elements (J2000.0) at JD 2455800.500000 Date:
2011/08/27:00:00:00.00
Body e i w Node q
JD-Tp
2000C4 0.985493941 23.2324167 24.3093368 78.8033779 0.045753040
39.8211541

Regards, Rainer


Residuals:
No Time d|r| (Gm) dRho (Gm) dRA*(") dDec (") dAng (")

4 20000205.163332 2.939E-03 0.000E+00 -0.415 4.031 4.052
5 20000205.167482 2.547E-03 -2.842E-14 -1.966 -2.910 3.512
6 20000205.171642 3.300E-03 -2.842E-14 -1.614 4.254 4.550
7 20000205.175112 1.140E-03 -2.842E-14 -1.535 -0.342 1.573
8 20000205.184142 1.085E-03 -2.842E-14 1.432 -0.436 1.497
9 20000205.188312 3.953E-03 -2.842E-14 -2.748 -4.707 5.451
10 20000205.192472 2.418E-03 -2.842E-14 1.837 -2.783 3.334
11 20000205.225802 1.790E-03 0.000E+00 -2.468 0.003 2.468
12 20000205.229972 2.832E-03 -5.684E-14 -2.816 -2.705 3.905
13 20000205.234142 9.097E-04 0.000E+00 -0.058 -1.253 1.254
14 20000205.242472 2.885E-03 -2.842E-14 -2.794 -2.832 3.978
15 20000205.246642 2.177E-03 -2.842E-14 -2.324 -1.901 3.002
16 20000205.250812 2.367E-03 0.000E+00 -1.661 -2.810 3.264
17 20000205.254972 2.547E-03 -2.842E-14 -2.447 -2.519 3.512
18 20000205.258442 1.813E-03 0.000E+00 -0.005 -2.500 2.500
19 20000205.267472 1.885E-03 -2.842E-14 -1.914 -1.759 2.599
20 20000205.271642 2.458E-03 0.000E+00 -1.815 -2.862 3.389
21 20000205.275822 4.061E-03 -2.842E-14 -2.815 -4.841 5.600
22 20000205.284152 3.078E-03 -2.842E-14 -0.568 -4.206 4.244
23 20000205.288312 4.605E-03 -2.842E-14 -2.937 -5.630 6.350
24 20000205.292472 2.775E-03 0.000E+00 -3.720 -0.893 3.826
25 20000205.296642 2.385E-03 0.000E+00 -1.279 -3.030 3.289
26 20000205.300122 2.956E-03 -5.684E-14 -1.702 -3.703 4.075
27 20000205.421642 2.418E-03 0.000E+00 2.170 -2.531 3.334
28 20000205.427272 3.178E-03 0.000E+00 1.540 -4.102 4.382
29 20000205.434272 2.318E-03 -2.842E-14 2.891 -1.363 3.196
30 20000205.438312 1.672E-03 0.000E+00 -1.169 -1.987 2.305
31 20000205.442482 4.259E-03 0.000E+00 4.522 -3.746 5.873
32 20000205.450812 3.217E-03 0.000E+00 4.042 -1.826 4.435
33 20000205.454972 9.700E-04 -2.842E-14 -0.690 -1.146 1.337
34 20000205.459142 2.515E-03 -2.842E-14 -0.913 -3.346 3.468
35 20000205.463312 3.938E-03 0.000E+00 3.168 -4.409 5.429
36 20000205.466782 2.766E-03 -2.842E-14 2.333 -3.016 3.814
37 20000205.475802 2.001E-03 -2.842E-14 0.272 -2.746 2.759
38 20000205.480002 1.847E-03 -2.842E-14 -1.051 -2.320 2.547
39 20000205.484142 3.749E-03 -2.842E-14 3.655 -3.655 5.169
40 20000205.492492 3.513E-03 -2.842E-14 2.652 -4.054 4.844
41 20000205.496642 3.910E-03 -2.842E-14 4.470 -3.014 5.392
42 20000205.500802 3.847E-03 -2.842E-14 4.966 -1.861 5.304
43 20000205.504982 2.175E-03 -2.842E-14 -1.469 -2.615 2.999
44 20000205.508462 3.936E-03 0.000E+00 1.743 -5.139 5.427
45 20000205.517472 3.721E-03 -2.842E-14 0.997 -5.033 5.131
46 20000205.521652 2.381E-03 2.842E-14 0.049 -3.282 3.282
47 20000205.525812 2.689E-03 -2.842E-14 1.530 -3.377 3.708
48 20000205.621642 3.653E-03 0.000E+00 -0.029 -5.036 5.036
49 20000205.625802 5.489E-03 0.000E+00 -1.204 -7.472 7.568
50 20000205.629982 1.418E-03 -2.842E-14 -0.693 -1.828 1.955
51 20000205.633442 4.062E-03 0.000E+00 0.890 -5.530 5.601
52 20000205.642482 3.696E-03 0.000E+00 5.089 -0.276 5.097
53 20000205.646642 4.886E-03 -2.842E-14 -2.561 -6.230 6.736
54 20000205.650812 3.631E-03 -2.842E-14 2.878 -4.096 5.006
55 20000205.659142 5.281E-03 -2.842E-14 -5.688 -4.546 7.281
56 20000205.663312 3.446E-03 0.000E+00 -3.570 -3.135 4.751
57 20000205.667602 3.168E-03 -2.842E-14 -2.312 -3.706 4.368
58 20051116.579974 8.353E-03 -2.842E-14 -10.192 5.363 11.517
59 20051116.588304 5.164E-03 -2.842E-14 5.177 4.889 7.120
60 20051116.629974 1.359E-03 -5.684E-14 -1.534 1.076 1.874
61 20051116.646644 1.123E-03 -2.842E-14 -1.455 0.529 1.548
62 20051116.663474 9.668E-03 -2.842E-14 -11.746 -6.303 13.330
63 20051116.671644 2.586E-03 -2.842E-14 -1.449 -3.257 3.565
64 20051116.688584 3.326E-03 0.000E+00 -4.355 -1.436 4.586
65 20051116.705244 7.739E-03 2.842E-14 -4.836 -9.511 10.670
66 20051116.713304 2.129E-02 2.842E-14 -28.034 -8.696 29.352
67 20051116.729974 9.577E-03 0.000E+00 -11.345 -6.756 13.205
68 20051116.746644 1.678E-02 -5.684E-14 -11.571 -20.033 23.135
69 20051116.754984 7.706E-03 0.000E+00 -10.242 2.824 10.625
70 20051116.771644 1.158E-02 -2.842E-14 -9.361 12.927 15.961
71 20051116.788304 7.999E-04 0.000E+00 -0.258 -1.072 1.103
72 20051116.814454 8.086E-03 0.000E+00 6.290 9.205 11.148
73 20051116.829974 1.547E-02 0.000E+00 4.739 -20.801 21.334
74 20051116.838304 9.824E-03 -2.842E-14 4.982 12.597 13.546
75 20051116.979984 9.116E-03 -2.842E-14 -3.081 -12.185 12.569
76 20051116.996644 6.770E-03 -2.842E-14 5.672 -7.413 9.335
77 20051117.004974 8.377E-03 0.000E+00 9.892 -5.964 11.551
78 20051117.038594 2.308E-02 -2.842E-14 18.048 -26.209 31.822
79 20051117.079974 4.613E-03 -2.842E-14 6.361 0.062 6.361
80 20051117.088304 1.410E-02 0.000E+00 16.087 -10.912 19.438
81 20051117.104974 1.532E-02 -2.842E-14 0.310 -21.127 21.130
82 20051117.121644 2.040E-02 -2.842E-14 10.636 -26.045 28.133
83 20051117.129974 1.713E-02 -2.842E-14 10.018 -21.394 23.624
84 20051117.146644 1.556E-02 0.000E+00 21.454 -0.009 21.454
85 20051117.163514 2.429E-03 -2.842E-14 2.022 2.670 3.350
86 20051117.171644 1.131E-02 0.000E+00 12.713 9.021 15.589
87 20051117.321644 2.320E-02 -2.842E-14 5.568 31.498 31.986
88 20051117.346644 2.156E-02 -5.684E-14 -16.700 24.598 29.732
89 20051117.363304 1.069E-02 0.000E+00 4.814 -13.938 14.746
90 20051117.388304 2.102E-02 0.000E+00 -28.271 6.387 28.983
91 20051117.405244 8.250E-03 -2.842E-14 -3.210 10.913 11.375
92 20051117.431624 3.289E-02 0.000E+00 45.332 -1.458 45.355
93 20051117.446644 1.533E-02 0.000E+00 6.427 20.142 21.142
94 20051117.471644 6.419E-03 0.000E+00 -6.599 5.897 8.850
95 20051117.488304 7.821E-03 -2.842E-14 -4.823 9.645 10.784
96 20051117.513314 5.715E-03 0.000E+00 -6.185 4.883 7.880
97 20051117.529984 2.013E-02 -2.842E-14 -18.262 20.902 27.755
98 20051117.571644 1.004E-02 0.000E+00 13.529 2.921 13.841
99 20051117.596654 1.268E-02 0.000E+00 -17.274 2.652 17.477
100 20051117.613324 2.171E-02 -2.842E-14 15.316 25.726 29.940
101 20051117.638304 6.690E-03 -2.842E-14 1.022 9.167 9.224
102 20051117.655244 2.658E-02 -2.842E-14 -19.447 31.069 36.653
103 20051117.679974 9.147E-03 0.000E+00 -4.317 11.849 12.611
104 20051117.696644 1.981E-02 2.842E-14 -12.342 24.365 27.313
105 20110717.630120 1.885E-02 -5.684E-14 10.688 23.686 25.986
106 20110717.638470 1.002E-02 -2.842E-14 1.188 13.766 13.817
107 20110717.646790 6.403E-03 -5.684E-14 6.205 6.279 8.828
108 20110717.655120 2.085E-02 -2.842E-14 -27.652 -7.878 28.752
109 20110717.663470 1.207E-02 -5.684E-14 -13.185 -10.149 16.639
110 20110717.713470 9.044E-03 -5.684E-14 2.897 -12.128 12.469
111 20110717.721800 6.671E-03 2.842E-14 -8.339 3.883 9.198
112 20110717.730120 1.038E-02 -2.842E-14 -3.962 13.755 14.314
113 20110717.738450 1.531E-02 -2.842E-14 2.199 20.993 21.108
114 20110717.746790 7.418E-03 -5.684E-14 1.597 10.102 10.228
115 20110717.796800 1.148E-03 -2.842E-14 1.018 -1.212 1.583
116 20110717.805120 8.890E-03 -5.684E-14 0.833 -12.229 12.257
117 20110717.813450 4.412E-03 -2.842E-14 5.721 2.067 6.083
118 20110717.821790 1.121E-02 -5.684E-14 1.553 15.380 15.458
119 20110717.830120 7.445E-03 -2.842E-14 1.739 10.116 10.265
120 20110717.883750 1.664E-02 -2.842E-14 1.134 22.918 22.946
121 20110717.888450 3.476E-03 -2.842E-14 2.271 -4.221 4.793
122 20110717.896800 2.793E-03 -2.842E-14 -3.851 -0.049 3.852
123 20110717.905120 1.155E-02 -8.527E-14 13.263 8.805 15.920
124 20110717.913450 2.184E-02 0.000E+00 -30.106 -0.041 30.106
RMS -------------- 1.025E-02 2.889E-14 9.478 10.492 14.139



On 19 Jul 2011, at 0:00, Rainer Kracht wrote:

> Hi,
>
> from C3 images 2011 July 17 15:06 - 21:34 UTC:
>
> SOHO2115 S2011 07 17.62934 07 31 35.95 +20 57 09.0 7.51R
249
> SOHO2115 s2011 07 17.62934 2 -0.00481836 +0.00970847 +0.00328107
249
> SOHO2115 S2011 07 17.63769 07 31 46.02 +20 57 41.2 7.21R
249
> SOHO2115 s2011 07 17.63769 2 -0.00481861 +0.00970839 +0.00328102
249
> SOHO2115 S2011 07 17.64601 07 31 57.15 +20 58 15.7 7.18R
249
> SOHO2115 s2011 07 17.64601 2 -0.00481885 +0.00970831 +0.00328098
249
> SOHO2115 S2011 07 17.65434 07 32 05.58 +20 58 43.6 6.90R
249
> SOHO2115 s2011 07 17.65434 2 -0.00481910 +0.00970822 +0.00328093
249
> SOHO2115 S2011 07 17.66269 07 32 17.55 +20 59 23.5 7.05R
249
> SOHO2115 s2011 07 17.66269 2 -0.00481935 +0.00970814 +0.00328089
249
> SOHO2115 S2011 07 17.71269 07 33 25.56 +21 03 34.2 6.87R
249
> SOHO2115 s2011 07 17.71269 2 -0.00482083 +0.00970765 +0.00328063
249
> SOHO2115 S2011 07 17.72102 07 33 36.13 +21 04 32.3 6.72R
249
> SOHO2115 s2011 07 17.72102 2 -0.00482108 +0.00970757 +0.00328059
249
> SOHO2115 S2011 07 17.72934 07 33 47.87 +21 05 24.2 6.90R
249
> SOHO2115 s2011 07 17.72934 2 -0.00482132 +0.00970749 +0.00328054
249
> SOHO2115 S2011 07 17.73767 07 33 59.82 +21 06 13.5 6.42R
249
> SOHO2115 s2011 07 17.73767 2 -0.00482157 +0.00970741 +0.00328050
249
> SOHO2115 S2011 07 17.74601 07 34 11.37 +21 06 44.7 6.63R
249
> SOHO2115 s2011 07 17.74601 2 -0.00482182 +0.00970732 +0.00328046
249
> SOHO2115 S2011 07 17.79602 07 35 22.33 +21 10 45.1 6.65R
249
> SOHO2115 s2011 07 17.79602 2 -0.00482331 +0.00970683 +0.00328020
249
> SOHO2115 S2011 07 17.80434 07 35 34.38 +21 11 15.8 6.53R
249
> SOHO2115 s2011 07 17.80434 2 -0.00482356 +0.00970675 +0.00328015
249
> SOHO2115 S2011 07 17.81267 07 35 46.88 +21 12 11.8 6.62R
249
> SOHO2115 s2011 07 17.81267 2 -0.00482380 +0.00970667 +0.00328011
249
> SOHO2115 S2011 07 17.82101 07 35 58.82 +21 13 06.8 6.61R
249
> SOHO2115 s2011 07 17.82101 2 -0.00482405 +0.00970659 +0.00328007
249
> SOHO2115 S2011 07 17.82934 07 36 11.13 +21 13 43.1 6.50R
249
> SOHO2115 s2011 07 17.82934 2 -0.00482430 +0.00970651 +0.00328003
249
> SOHO2115 S2011 07 17.88297 07 37 32.02 +21 18 21.3 6.34R
249
> SOHO2115 s2011 07 17.88297 2 -0.00482590 +0.00970598 +0.00327975
249
> SOHO2115 S2011 07 17.88767 07 37 39.34 +21 18 17.2 6.27R
249
> SOHO2115 s2011 07 17.88767 2 -0.00482604 +0.00970593 +0.00327973
249
> SOHO2115 S2011 07 17.89602 07 37 51.82 +21 19 02.2 6.35R
249
> SOHO2115 s2011 07 17.89602 2 -0.00482629 +0.00970585 +0.00327969
249
> SOHO2115 S2011 07 17.90434 07 38 05.99 +21 19 51.6 6.20R
249
> SOHO2115 s2011 07 17.90434 2 -0.00482654 +0.00970577 +0.00327964
249
> SOHO2115 S2011 07 17.91267 07 38 15.92 +21 20 23.2 6.20R
249
> SOHO2115 s2011 07 17.91267 2 -0.00482679 +0.00970569 +0.00327960
249
>
> Rainer
>
>
> ------------------------------------
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