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 2009 June 18.0 TT = JDT 2455000.5 T 2005 Dec. 21.0788 TT MPC q 3.042390 (2000.0) P Q n 0.1193290 Peri. 222.9909 +0.1999899 +0.9711858 a 4.086065 Node 58.9391 -0.8529051 +0.2376730 e 0.255423 Incl. 8.7034 -0.4822416 -0.0175953 P 8.26An 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 m2WARNING! 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 2009 10 01 07 00.74 +27 31.7 5.106 5.106 84.4 11.3 20.2 21.8 2009 10 06 07 02.59 +27 36.5 5.029 5.108 88.9 11.3 20.2 21.7 2009 10 11 07 04.13 +27 41.9 4.951 5.110 93.5 11.2 20.1 21.7 2009 10 16 07 05.33 +27 48.0 4.874 5.111 98.1 11.1 20.1 21.7 2009 10 21 07 06.17 +27 54.8 4.798 5.113 102.9 10.9 20.1 21.6 2009 10 26 07 06.65 +28 02.3 4.723 5.114 107.8 10.7 20.0 21.6 2009 10 31 07 06.75 +28 10.4 4.650 5.116 112.7 10.3 20.0 21.5 2009 11 05 07 06.47 +28 19.2 4.580 5.117 117.8 9.9 20.0 21.5 2009 11 10 07 05.80 +28 28.5 4.513 5.119 122.9 9.3 20.0 21.4 2009 11 15 07 04.73 +28 38.4 4.449 5.120 128.1 8.7 19.9 21.4 2009 11 20 07 03.28 +28 48.5 4.391 5.121 133.4 8.1 19.9 21.3 2009 11 25 07 01.46 +28 59.0 4.338 5.122 138.8 7.3 19.9 21.3 2009 11 30 06 59.29 +29 09.4 4.290 5.123 144.3 6.5 19.9 21.2 2009 12 05 06 56.79 +29 19.7 4.248 5.124 149.8 5.6 19.8 21.1 2009 12 10 06 54.00 +29 29.8 4.214 5.125 155.3 4.6 19.8 21.1 2009 12 15 06 50.97 +29 39.3 4.186 5.126 160.7 3.6 19.8 21.0 2009 12 20 06 47.73 +29 48.1 4.166 5.126 166.0 2.7 19.8 20.9 2009 12 25 06 44.36 +29 56.1 4.154 5.127 170.6 1.8 19.8 20.9 2009 12 30 06 40.90 +30 03.0 4.150 5.128 173.0 1.3 19.8 20.8 2010 01 04 06 37.43 +30 08.9 4.154 5.128 171.3 1.7 19.8 20.9 2010 01 09 06 34.01 +30 13.7 4.166 5.129 166.9 2.5 19.8 20.9 2010 01 14 06 30.69 +30 17.2 4.186 5.129 161.7 3.4 19.8 21.0 2010 01 19 06 27.54 +30 19.6 4.213 5.129 156.3 4.4 19.8 21.1 2010 01 24 06 24.62 +30 20.9 4.248 5.130 150.8 5.4 19.8 21.1 2010 01 29 06 21.97 +30 21.2 4.289 5.130 145.3 6.3 19.9 21.2 2010 02 03 06 19.63 +30 20.6 4.337 5.130 139.9 7.1 19.9 21.3 2010 02 08 06 17.64 +30 19.1 4.391 5.130 134.5 7.9 19.9 21.3 2010 02 13 06 16.01 +30 17.0 4.449 5.130 129.1 8.6 19.9 21.4 2010 02 18 06 14.77 +30 14.3 4.513 5.130 123.9 9.2 20.0 21.4 2010 02 23 06 13.93 +30 11.2 4.581 5.129 118.7 9.7 20.0 21.5 2010 02 28 06 13.49 +30 07.7 4.651 5.129 113.6 10.2 20.0 21.5 2010 03 05 06 13.44 +30 04.0 4.725 5.129 108.6 10.6 20.1 21.6 2010 03 10 06 13.78 +30 00.0 4.801 5.128 103.7 10.8 20.1 21.6 2010 03 15 06 14.51 +29 55.9 4.878 5.128 99.0 11.0 20.1 21.7 2010 03 20 06 15.60 +29 51.7 4.957 5.127 94.2 11.2 20.2 21.7 2010 03 25 06 17.04 +29 47.3 5.035 5.127 89.6 11.2 20.2 21.8 2010 03 30 06 18.82 +29 42.9 5.114 5.126 85.1 11.2 20.2 21.8 2010 04 04 06 20.91 +29 38.5 5.192 5.125 80.7 11.1 20.3 21.8 2010 04 09 06 23.30 +29 33.9 5.269 5.125 76.3 10.9 20.3 21.8 2010 04 14 06 25.97 +29 29.2 5.344 5.124 72.0 10.7 20.3 21.9 2010 04 19 06 28.90 +29 24.4 5.418 5.123 67.8 10.5 20.4 21.9 2010 04 24 06 32.07 +29 19.4 5.489 5.122 63.6 10.1 20.4 21.9 2010 04 29 06 35.46 +29 14.2 5.557 5.120 59.5 9.8 20.4 21.9 2010 05 04 06 39.06 +29 08.8 5.623 5.119 55.5 9.3 20.4 21.9 2010 05 09 06 42.84 +29 03.2 5.685 5.118 51.5 8.9 20.5 21.9 2010 05 14 06 46.80 +28 57.3 5.743 5.117 47.6 8.4 20.5 21.9 2010 05 19 06 50.91 +28 51.1 5.798 5.115 43.7 7.9 20.5 21.9 2010 05 24 06 55.16 +28 44.7 5.849 5.114 39.9 7.3 20.5 21.9 2010 05 29 06 59.53 +28 37.9 5.896 5.112 36.1 6.7 20.5 21.9 2010 06 03 07 04.01 +28 30.7 5.938 5.111 32.4 6.1 20.5 21.9 2010 06 08 07 08.58 +28 23.2 5.976 5.109 28.7 5.5 20.5 21.9 2010 06 13 07 13.25 +28 15.4 6.009 5.107 25.0 4.8 20.6 21.8 2010 06 18 07 17.98 +28 07.1 6.037 5.105 21.4 4.2 20.6 21.8 2010 06 23 07 22.77 +27 58.6 6.061 5.103 17.9 3.5 20.6 21.8 2010 06 28 07 27.60 +27 49.7 6.079 5.101 14.5 2.9 20.6 21.8 2010 07 03 07 32.47 +27 40.4 6.093 5.099 11.3 2.2 20.6 21.7 2010 07 08 07 37.36 +27 30.9 6.101 5.097 8.4 1.7 20.6 21.7 2010 07 13 07 42.27 +27 21.0 6.104 5.095 6.3 1.3 20.6 21.6This 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.
