C/2017 O1 Epoch 2017 Sept. 4.0 TT = JDT 2458000.5 T 2017 Oct. 14.7849 TT MPC 106347 q 1.498711 (2000.0) P Q z +0.002290 Peri. 20.9079 +0.7216767 -0.6335220 +/-0.000009 Node 25.8102 +0.5084970 +0.2117061 e 0.996568 Incl. 39.8491 +0.4696952 +0.7441978 From 1527 observations 2017 July 19-Sept. 30, mean residual 0".5. C/2017 O1 (ASASSN) Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2017 07 06 02 10.78 -14 27.9 1.944 2.032 80.0 29.5 11.6 2017 07 11 02 19.08 -13 02.9 1.859 1.988 81.8 30.4 11.4 2017 07 16 02 27.34 -11 33.8 1.775 1.946 83.7 31.3 11.3 2017 07 21 02 35.55 -09 59.9 1.691 1.905 85.6 32.1 11.1 2017 07 26 02 43.71 -08 20.3 1.609 1.865 87.5 33.0 10.9 2017 07 31 02 51.80 -06 34.2 1.528 1.826 89.4 33.8 10.8 2017 08 05 02 59.83 -04 40.2 1.449 1.789 91.4 34.5 10.6 2017 08 10 03 07.79 -02 37.1 1.371 1.753 93.4 35.2 10.4 2017 08 15 03 15.68 -00 23.3 1.295 1.719 95.5 35.9 10.2 2017 08 20 03 23.50 +02 02.8 1.222 1.687 97.6 36.5 10.0 2017 08 25 03 31.22 +04 43.4 1.151 1.657 99.8 37.0 9.8 2017 08 30 03 38.84 +07 40.4 1.084 1.629 102.1 37.3 9.7 2017 09 04 03 46.36 +10 56.2 1.020 1.603 104.4 37.5 9.5 2017 09 09 03 53.78 +14 33.1 0.961 1.580 106.8 37.6 9.3 2017 09 14 04 01.07 +18 33.0 0.906 1.559 109.2 37.5 9.1 2017 09 19 04 08.23 +22 57.0 0.857 1.542 111.6 37.3 9.0 2017 09 24 04 15.21 +27 45.5 0.814 1.527 113.9 36.9 8.8 2017 09 29 04 21.99 +32 56.6 0.779 1.515 116.0 36.5 8.7 2017 10 04 04 28.53 +38 26.8 0.751 1.506 117.9 35.9 8.6 2017 10 09 04 34.76 +44 09.9 0.732 1.501 119.4 35.4 8.6 2017 10 14 04 40.59 +49 57.6 0.722 1.499 120.5 35.0 8.5 2017 10 19 04 45.82 +55 40.6 0.720 1.500 121.0 34.7 8.5 2017 10 24 04 50.23 +61 09.4 0.726 1.504 121.1 34.5 8.5 2017 10 29 04 53.45 +66 15.9 0.740 1.512 120.7 34.4 8.6 2017 11 03 04 54.92 +70 54.1 0.761 1.523 120.1 34.3 8.7 2017 11 08 04 53.65 +75 00.2 0.786 1.537 119.2 34.2 8.8 2017 11 13 04 47.91 +78 32.4 0.817 1.553 118.3 34.1 8.9 2017 11 18 04 34.65 +81 29.4 0.851 1.573 117.3 33.9 9.0 2017 11 23 04 08.60 +83 49.9 0.888 1.595 116.4 33.7 9.2 2017 11 28 03 22.12 +85 31.1 0.928 1.620 115.6 33.3 9.3 2017 12 03 02 11.89 +86 28.9 0.969 1.648 114.9 32.9 9.4 2017 12 08 00 56.01 +86 45.4 1.012 1.677 114.2 32.4 9.6 2017 12 13 00 02.57 +86 35.9 1.056 1.709 113.7 31.8 9.7 2017 12 18 23 37.86 +86 18.2 1.101 1.742 113.2 31.3 9.9 2017 12 23 23 35.06 +86 01.6 1.147 1.777 112.9 30.7 10.0 2017 12 28 23 48.00 +85 48.6 1.194 1.814 112.5 30.0 10.2 2018 01 02 00 12.99 +85 38.1 1.242 1.853 112.2 29.4 10.3 2018 01 07 00 47.49 +85 26.9 1.291 1.892 111.9 28.8 10.5 2018 01 12 01 28.86 +85 11.2 1.342 1.933 111.6 28.2 10.6 2018 01 17 02 13.64 +84 47.3 1.393 1.975 111.2 27.7 10.8 2018 01 22 02 58.10 +84 12.9 1.447 2.018 110.8 27.1 10.9 2018 01 27 03 39.36 +83 27.2 1.502 2.062 110.2 26.6 11.1 2018 02 01 04 15.94 +82 30.8 1.560 2.106 109.6 26.1 11.2 2018 02 06 04 47.65 +81 25.0 1.619 2.151 108.9 25.7 11.4 2018 02 11 05 15.00 +80 11.2 1.681 2.197 108.1 25.3 11.5 2018 02 16 05 38.73 +78 51.1 1.745 2.244 107.1 24.9 11.7 2018 02 21 05 59.54 +77 26.0 1.812 2.291 106.0 24.5 11.8 2018 02 26 06 18.01 +75 57.1 1.881 2.338 104.7 24.2 12.0 2018 03 03 06 34.61 +74 25.6 1.953 2.386 103.4 23.8 12.1 2018 03 08 06 49.69 +72 52.2 2.028 2.434 101.9 23.5 12.2 2018 03 13 07 03.56 +71 17.6 2.105 2.482 100.2 23.2 12.4 2018 03 18 07 16.44 +69 42.4 2.185 2.531 98.5 22.9 12.5 2018 03 23 07 28.50 +68 07.3 2.267 2.580 96.6 22.6 12.7 2018 03 28 07 39.89 +66 32.6 2.351 2.629 94.7 22.2 12.8 2018 04 02 07 50.69 +64 58.6 2.438 2.678 92.7 21.9 12.9 2018 04 07 08 00.98 +63 25.8 2.527 2.727 90.5 21.5 13.1 2018 04 12 08 10.84 +61 54.1 2.618 2.776 88.3 21.2 13.2 2018 04 17 08 20.32 +60 23.9 2.711 2.826 86.1 20.8 13.3 2018 04 22 08 29.48 +58 55.3 2.805 2.875 83.8 20.3 13.5 2018 04 27 08 38.34 +57 28.3 2.901 2.925 81.4 19.9 13.6 2018 05 02 08 46.93 +56 03.2 2.997 2.974 79.0 19.4 13.7 2018 05 07 08 55.27 +54 39.8 3.095 3.024 76.5 18.9 13.8 2018 05 12 09 03.39 +53 18.2 3.193 3.073 74.1 18.4 13.9 2018 05 17 09 11.31 +51 58.4 3.292 3.123 71.6 17.9 14.0 2018 05 22 09 19.06 +50 40.5 3.391 3.172 69.0 17.3 14.2 2018 05 27 09 26.62 +49 24.5 3.489 3.222 66.5 16.8 14.3 2018 06 01 09 34.02 +48 10.3 3.588 3.271 63.9 16.2 14.4 2018 06 06 09 41.27 +46 57.8 3.686 3.320 61.3 15.6 14.5 2018 06 11 09 48.37 +45 47.2 3.783 3.370 58.7 14.9 14.6 2018 06 16 09 55.35 +44 38.3 3.879 3.419 56.2 14.3 14.7 2018 06 21 10 02.20 +43 31.1 3.974 3.468 53.6 13.6 14.8 2018 06 26 10 08.92 +42 25.7 4.067 3.517 51.0 13.0 14.9 2018 07 01 10 15.52 +41 22.0 4.158 3.566 48.5 12.3 15.0 2018 07 06 10 22.01 +40 20.0 4.248 3.615 45.9 11.7 15.0 2018 07 11 10 28.39 +39 19.7 4.335 3.664 43.4 11.0 15.1 2018 07 16 10 34.67 +38 21.0 4.419 3.712 41.0 10.3 15.2 2018 07 21 10 40.85 +37 24.0 4.501 3.761 38.6 9.7 15.3 2018 07 26 10 46.92 +36 28.6 4.580 3.809 36.3 9.1 15.4 2018 07 31 10 52.90 +35 35.0 4.656 3.857 34.0 8.5 15.4 2018 08 05 10 58.77 +34 43.0 4.729 3.906 32.0 7.9 15.5 2018 08 10 11 04.56 +33 52.6 4.799 3.954 30.1 7.4 15.6 2018 08 15 11 10.24 +33 04.0 4.864 4.002 28.4 6.9 15.7 2018 08 20 11 15.83 +32 17.0 4.926 4.050 26.9 6.5 15.7 2018 08 25 11 21.32 +31 31.8 4.984 4.097 25.8 6.2 15.8 2018 08 30 11 26.71 +30 48.4 5.038 4.145 25.0 5.9 15.8 2018 09 04 11 32.00 +30 06.7 5.087 4.193 24.7 5.8 15.9 2018 09 09 11 37.19 +29 26.8 5.133 4.240 24.9 5.7 15.9 2018 09 14 11 42.27 +28 48.8 5.173 4.287 25.5 5.8 16.0 2018 09 19 11 47.24 +28 12.7 5.210 4.334 26.5 5.9 16.0 2018 09 24 11 52.10 +27 38.5 5.242 4.381 28.0 6.2 16.1 2018 09 29 11 56.83 +27 06.3 5.269 4.428 29.9 6.5 16.1 2018 10 04 12 01.45 +26 36.1 5.292 4.475 32.0 6.8 16.2 2018 10 09 12 05.93 +26 08.0 5.310 4.522 34.5 7.2 16.2 H = 8.0, 2.5n = 7.0