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117P/Helin-Roman-Alu

Orbital Elements

The following orbital elements are taken from MPC 45658:

117P/Helin-Roman-Alu
Epoch 2005 Dec. 16.0 TT = JDT 2453720.5
T 2005 Dec. 19.9071 TT                                  MPC
q   3.036972             (2000.0)            P               Q
n   0.1196072      Peri.  222.6710      +0.1945786      +0.9722749
a   4.079727       Node    58.9404      -0.8541888      +0.2329553
e   0.255594       Incl.    8.7081      -0.4821832      -0.0203323
P   8.24
From 191 observations 1988-1999, mean residual 0".7.

Elements are also available for the current standard epoch:

117P/Helin-Roman-Alu
Epoch 2008 Nov. 30.0 TT = JDT 2454800.5
T 2005 Dec. 21.0427 TT                                  MPC
q   3.040845             (2000.0)            P               Q
n   0.1193711      Peri.  222.9429      +0.1992369      +0.9713366
a   4.085106       Node    58.9428      -0.8530827      +0.2370263
e   0.255626       Incl.    8.7051      -0.4822391      -0.0179931
P   8.26

An explanation of the orbital elements is available.

These orbital elements are also available in forms suitable for loading into a number of popular planetarium-type software programs.

Ephemeris

The following ephemeris is at intervals of five days. A daily ephemeris covering the same time interval is also available.

Personalized ephemerides for this (and other) objects may be generated using the Minor Planet & Comet Ephemeris Service.

Recent magnitude estimates for this comet (as reported to the ICQ) may be available.

Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2

WARNING!

This comet gets close to the sun during the period covered in the ephemeris below. Observers are warned to be wary of observing comets near the sun. NEVER point any kind of optical instrument at the sun--instant blindness will be the probable result.

2008 08 22 04 44.65 +22 33.9 4.860 4.727 76.5 12.0 19.4 21.5 2008 08 27 04 47.09 +22 42.3 4.791 4.734 80.8 12.2 19.4 21.5 2008 09 01 04 49.23 +22 50.3 4.720 4.742 85.1 12.2 19.4 21.5 2008 09 06 04 51.07 +22 57.7 4.650 4.749 89.5 12.3 19.4 21.5 2008 09 11 04 52.57 +23 04.7 4.579 4.756 94.0 12.2 19.3 21.4 2008 09 16 04 53.73 +23 11.2 4.508 4.763 98.6 12.0 19.3 21.4 2008 09 21 04 54.53 +23 17.2 4.439 4.770 103.3 11.8 19.3 21.3 2008 09 26 04 54.95 +23 22.8 4.371 4.777 108.1 11.5 19.3 21.3 2008 10 01 04 54.99 +23 27.9 4.304 4.784 112.9 11.1 19.3 21.3 2008 10 06 04 54.63 +23 32.5 4.241 4.791 117.9 10.6 19.2 21.2 2008 10 11 04 53.88 +23 36.6 4.180 4.798 123.0 10.0 19.2 21.2 2008 10 16 04 52.73 +23 40.2 4.124 4.805 128.2 9.4 19.2 21.1 2008 10 21 04 51.20 +23 43.2 4.071 4.811 133.5 8.6 19.2 21.1 2008 10 26 04 49.30 +23 45.5 4.024 4.818 138.9 7.8 19.2 21.0 2008 10 31 04 47.06 +23 47.2 3.982 4.825 144.4 6.9 19.2 20.9 2008 11 05 04 44.49 +23 48.2 3.947 4.831 150.0 5.9 19.2 20.9 2008 11 10 04 41.66 +23 48.4 3.918 4.837 155.7 4.8 19.2 20.8 2008 11 15 04 38.59 +23 47.9 3.896 4.844 161.4 3.7 19.2 20.7 2008 11 20 04 35.34 +23 46.7 3.882 4.850 167.1 2.6 19.2 20.7 2008 11 25 04 31.97 +23 44.8 3.875 4.856 172.8 1.5 19.2 20.6 2008 11 30 04 28.54 +23 42.3 3.877 4.862 177.8 0.4 19.2 20.5 2008 12 05 04 25.12 +23 39.3 3.886 4.868 174.9 1.0 19.2 20.5 2008 12 10 04 21.77 +23 35.9 3.904 4.874 169.2 2.2 19.2 20.6 2008 12 15 04 18.55 +23 32.3 3.929 4.880 163.5 3.3 19.2 20.7 2008 12 20 04 15.51 +23 28.5 3.962 4.886 157.7 4.4 19.3 20.8 2008 12 25 04 12.70 +23 24.8 4.002 4.892 152.0 5.4 19.3 20.9 2008 12 30 04 10.18 +23 21.4 4.049 4.898 146.3 6.4 19.3 21.0 2009 01 04 04 07.98 +23 18.3 4.102 4.903 140.7 7.3 19.4 21.0 2009 01 09 04 06.12 +23 15.8 4.162 4.909 135.2 8.1 19.4 21.1 2009 01 14 04 04.64 +23 14.0 4.227 4.915 129.8 8.8 19.5 21.2 2009 01 19 04 03.53 +23 12.9 4.296 4.920 124.5 9.5 19.5 21.3 2009 01 24 04 02.80 +23 12.6 4.369 4.925 119.2 10.0 19.6 21.3 2009 01 29 04 02.47 +23 13.2 4.446 4.931 114.1 10.5 19.6 21.4 2009 02 03 04 02.53 +23 14.7 4.526 4.936 109.0 10.9 19.6 21.4 2009 02 08 04 02.96 +23 17.1 4.608 4.941 104.1 11.2 19.7 21.5 2009 02 13 04 03.76 +23 20.4 4.692 4.946 99.2 11.4 19.7 21.5 2009 02 18 04 04.92 +23 24.5 4.776 4.951 94.4 11.5 19.8 21.6 2009 02 23 04 06.41 +23 29.5 4.861 4.956 89.7 11.5 19.8 21.6 2009 02 28 04 08.23 +23 35.2 4.946 4.961 85.1 11.5 19.9 21.7 2009 03 05 04 10.35 +23 41.6 5.030 4.966 80.6 11.4 19.9 21.7 2009 03 10 04 12.76 +23 48.6 5.113 4.971 76.2 11.2 20.0 21.7 2009 03 15 04 15.44 +23 56.1 5.195 4.976 71.8 10.9 20.0 21.7 2009 03 20 04 18.37 +24 04.1 5.275 4.980 67.5 10.6 20.1 21.8 2009 03 25 04 21.54 +24 12.5 5.352 4.985 63.3 10.3 20.1 21.8 2009 03 30 04 24.92 +24 21.2 5.427 4.989 59.2 9.9 20.1 21.8 2009 04 04 04 28.51 +24 30.1 5.498 4.994 55.1 9.5 20.2 21.8 2009 04 09 04 32.28 +24 39.1 5.567 4.998 51.0 9.0 20.2 21.8 2009 04 14 04 36.23 +24 48.2 5.631 5.002 47.0 8.4 20.2 21.8 2009 04 19 04 40.32 +24 57.3 5.692 5.006 43.1 7.9 20.3 21.8 2009 04 24 04 44.56 +25 06.3 5.749 5.011 39.2 7.3 20.3 21.8 2009 04 29 04 48.93 +25 15.2 5.802 5.015 35.4 6.7 20.3 21.8 2009 05 04 04 53.41 +25 23.9 5.850 5.019 31.6 6.0 20.3 21.8 2009 05 09 04 57.99 +25 32.4 5.894 5.023 27.8 5.4 20.4 21.8 2009 05 14 05 02.65 +25 40.7 5.933 5.027 24.0 4.7 20.4 21.8 2009 05 19 05 07.40 +25 48.6 5.967 5.030 20.3 4.0 20.4 21.8 2009 05 24 05 12.20 +25 56.2 5.996 5.034 16.7 3.3 20.4 21.7 2009 05 29 05 17.06 +26 03.4 6.020 5.038 13.0 2.6 20.4 21.7 2009 06 03 05 21.96 +26 10.2 6.039 5.041 9.5 1.9 20.5 21.6 2009 06 08 05 26.89 +26 16.6 6.053 5.045 6.2 1.2 20.5 21.6 2009 06 13 05 31.83 +26 22.6 6.061 5.048 3.5 0.7 20.5 21.6 2009 06 18 05 36.78 +26 28.2 6.065 5.052 3.7 0.7 20.5 21.6 2009 06 23 05 41.73 +26 33.3 6.064 5.055 6.5 1.3 20.5 21.6 2009 06 28 05 46.66 +26 38.0 6.057 5.058 9.8 2.0 20.5 21.7 2009 07 03 05 51.56 +26 42.3 6.045 5.061 13.4 2.7 20.5 21.7 2009 07 08 05 56.42 +26 46.2 6.028 5.064 17.0 3.4 20.5 21.8 2009 07 13 06 01.23 +26 49.8 6.006 5.067 20.6 4.0 20.5 21.8 2009 07 18 06 05.99 +26 53.0 5.979 5.070 24.3 4.7 20.5 21.8 2009 07 23 06 10.66 +26 55.8 5.948 5.073 28.0 5.4 20.5 21.8 2009 07 28 06 15.26 +26 58.4 5.912 5.076 31.7 6.0 20.5 21.9 2009 08 02 06 19.75 +27 00.8 5.871 5.079 35.5 6.7 20.5 21.9 2009 08 07 06 24.12 +27 03.0 5.826 5.081 39.3 7.3 20.4 21.9 2009 08 12 06 28.38 +27 05.0 5.776 5.084 43.1 7.8 20.4 21.9 2009 08 17 06 32.50 +27 07.0 5.723 5.087 47.0 8.4 20.4 21.9 2009 08 22 06 36.46 +27 08.9 5.666 5.089 50.9 8.9 20.4 21.9 2009 08 27 06 40.25 +27 10.9 5.605 5.091 54.9 9.3 20.4 21.9 2009 09 01 06 43.86 +27 13.0 5.541 5.094 58.9 9.8 20.4 21.9 2009 09 06 06 47.27 +27 15.2 5.474 5.096 63.0 10.1 20.3 21.9 2009 09 11 06 50.46 +27 17.7 5.405 5.098 67.1 10.5 20.3 21.9 2009 09 16 06 53.43 +27 20.6 5.333 5.100 71.3 10.8 20.3 21.8 2009 09 21 06 56.14 +27 23.8 5.259 5.102 75.6 11.0 20.3 21.8 2009 09 26 06 58.58 +27 27.5 5.183 5.104 79.9 11.2 20.2 21.8

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