Orbital elements:
C/2018 Y1 (Iwamoto)
T 2019 Feb. 6.81154 TT Sato
q 1.2837540 (2000.0) P Q
Peri. 358.01023 -0.85904793 +0.47892088
Node 147.34145 +0.47415954 +0.61140358
e 1.0 Incl. 160.43018 +0.19289734 +0.62993687
From 99 observations 2018 Dec. 18-26, mean residual 0".52.
Ephemeris:
2018/19 R.A.(2000.0) Decl Delta r m1 Mot./PA Elong. Moon Age
4h JST h m 。 ， m ， 。 。 。
Dec. 18 14 17.77 -24 46.7 1.998 1.494 13.2 2.3/355 46.0 156 0.72
Dec. 19 14 17.75 -24 44.4 1.971 1.486 13.2 2.5/349 47.0 164 0.81
Dec. 20 14 17.72 -24 41.9 1.944 1.479 13.1 2.6/343 48.0 163 0.89
Dec. 21 14 17.66 -24 39.4 1.916 1.472 13.1 2.9/338 49.0 154 0.95
Dec. 22 14 17.58 -24 36.8 1.887 1.465 13.0 3.1/333 50.1 141 0.99
Dec. 23 14 17.48 -24 34.0 1.859 1.458 13.0 3.4/329 51.1 127 1.00
Dec. 24 14 17.35 -24 31.0 1.830 1.451 12.9 3.8/326 52.1 113 0.98
Dec. 25 14 17.19 -24 27.9 1.801 1.444 12.9 4.1/323 53.1 99 0.94
Dec. 26 14 17.01 -24 24.6 1.771 1.437 12.8 4.5/320 54.2 84 0.87
Dec. 27 14 16.80 -24 21.2 1.741 1.431 12.8 4.9/317 55.2 70 0.78
Dec. 28 14 16.55 -24 17.5 1.711 1.424 12.7 5.4/315 56.3 56 0.68
Dec. 29 14 16.27 -24 13.7 1.681 1.418 12.6 5.9/314 57.4 43 0.57
Dec. 30 14 15.96 -24 09.6 1.650 1.412 12.6 6.5/312 58.5 31 0.46
Dec. 31 14 15.61 -24 05.3 1.619 1.406 12.5 7.0/311 59.6 20 0.35
Jan. 1 14 15.22 -24 00.7 1.588 1.400 12.5 7.7/309 60.7 15 0.25
Jan. 2 14 14.79 -23 55.8 1.557 1.394 12.4 8.4/308 61.8 20 0.17
Jan. 3 14 14.31 -23 50.7 1.525 1.388 12.3 9.1/307 62.9 29 0.10
Jan. 4 14 13.78 -23 45.2 1.493 1.382 12.3 9.9/306 64.0 41 0.05
Jan. 5 14 13.20 -23 39.3 1.461 1.377 12.2 10.7/306 65.2 52 0.02
Jan. 6 14 12.57 -23 33.1 1.429 1.372 12.1 11.6/305 66.4 64 0.00
Jan. 7 14 11.88 -23 26.4 1.396 1.367 12.1 12.6/304 67.6 76 0.00
Jan. 8 14 11.12 -23 19.3 1.363 1.361 12.0 13.7/304 68.8 87 0.03
Jan. 9 14 10.30 -23 11.7 1.330 1.357 11.9 14.8/303 70.0 99 0.07
Jan. 10 14 09.40 -23 03.6 1.297 1.352 11.9 16.1/303 71.2 111 0.12
Jan. 11 14 08.42 -22 54.8 1.263 1.347 11.8 17.4/303 72.5 122 0.19
Jan. 12 14 07.36 -22 45.4 1.229 1.343 11.7 18.9/302 73.8 134 0.27
Jan. 13 14 06.20 -22 35.3 1.196 1.338 11.7 20.5/302 75.1 145 0.36
Jan. 14 14 04.94 -22 24.4 1.162 1.334 11.6 22.3/302 76.4 156 0.45
Jan. 15 14 03.58 -22 12.7 1.128 1.330 11.5 24.3/302 77.8 164 0.55
Jan. 16 14 02.09 -22 00.0 1.093 1.326 11.4 26.4/301 79.2 164 0.65
Jan. 17 14 00.47 -21 46.2 1.059 1.323 11.3 28.7/301 80.6 155 0.75
Jan. 18 13 58.71 -21 31.2 1.024 1.319 11.3 31.3/301 82.1 143 0.84
Jan. 19 13 56.80 -21 14.9 0.990 1.316 11.2 34.2/301 83.6 129 0.92
Jan. 20 13 54.71 -20 57.1 0.955 1.312 11.1 37.4/301 85.2 114 0.97
Jan. 21 13 52.42 -20 37.7 0.921 1.309 11.0 41.0/301 86.8 99 1.00
Jan. 22 13 49.93 -20 16.4 0.886 1.306 10.9 45.1/301 88.5 83 0.99
Jan. 23 13 47.20 -19 52.9 0.851 1.304 10.8 49.6/301 90.2 68 0.96
Jan. 24 13 44.20 -19 27.0 0.817 1.301 10.7 54.7/301 92.0 53 0.90
Jan. 25 13 40.91 -18 58.4 0.782 1.299 10.6 60.5/302 93.9 38 0.82
Jan. 26 13 37.29 -18 26.5 0.748 1.297 10.5 67.1/302 95.9 24 0.72
Jan. 27 13 33.29 -17 51.1 0.714 1.295 10.4 74.7/302 98.0 14 0.62
Jan. 28 13 28.87 -17 11.3 0.680 1.293 10.3 83.4/302 100.3 16 0.51
Jan. 29 13 23.97 -16 26.7 0.646 1.291 10.2 93.4/302 102.7 27 0.41
Jan. 30 13 18.51 -15 36.2 0.613 1.289 10.0 105.1/303 105.2 40 0.31
Jan. 31 13 12.42 -14 39.1 0.580 1.288 9.9 118.5/303 108.0 53 0.22
Ephemeris:
2019 R.A.(2000.0) Decl Delta r m1 Mot./PA Elong. Moon Age
3h JST h m 。 ， m ， 。 。 。
Jan. 31 13 12.69 -14 41.6 0.581 1.288 9.9 117.9/303 107.8 53 0.22
Feb. 1 13 05.91 -13 36.9 0.549 1.287 9.8 133.5/303 110.8 67 0.15
Feb. 2 12 58.30 -12 22.9 0.518 1.286 9.7 151.7/304 114.0 81 0.09
Feb. 3 12 49.74 -10 58.1 0.487 1.285 9.5 172.8/304 117.5 95 0.04
Feb. 4 12 40.08 -09 20.6 0.457 1.285 9.4 197.2/305 121.4 109 0.01
Feb. 5 12 29.16 -07 28.2 0.429 1.284 9.2 225.3/305 125.6 124 0.00
Feb. 6 12 16.79 -05 18.7 0.403 1.284 9.1 257.0/305 130.3 140 0.01
Feb. 7 12 02.77 -02 50.1 0.378 1.284 9.0 291.8/305 135.6 155 0.03
Feb. 8 11 46.92 +00 00.8 0.356 1.284 8.8 328.7/305 141.4 171 0.07
Feb. 9 11 29.05 +03 09.7 0.337 1.284 8.7 365.2/305 147.8 169 0.13
Feb. 10 11 09.07 +06 39.9 0.321 1.284 8.6 398.0/305 154.7 152 0.20
Feb. 11 10 46.94 +10 25.1 0.310 1.285 8.5 422.8/304 162.1 133 0.28
Feb. 12 10 22.84 +14 17.9 0.303 1.286 8.5 435.8/303 169.4 114 0.38
Feb. 13 09 57.13 +18 07.8 0.301 1.287 8.5 434.6/301 174.4 94 0.48
Feb. 14 09 30.37 +21 43.5 0.304 1.288 8.5 419.3/299 170.7 74 0.59
Feb. 15 09 03.30 +24 55.6 0.311 1.289 8.6 392.8/296 163.6 54 0.69
Feb. 16 08 36.70 +27 38.0 0.324 1.291 8.7 359.1/293 156.4 34 0.79
Feb. 17 08 11.27 +29 48.9 0.340 1.293 8.8 322.3/290 149.6 16 0.88
Feb. 18 07 47.55 +31 30.2 0.360 1.294 8.9 285.7/287 143.3 13 0.94
Feb. 19 07 25.86 +32 45.7 0.382 1.296 9.0 251.3/284 137.6 30 0.99
Feb. 20 07 06.30 +33 40.2 0.407 1.299 9.2 220.3/281 132.5 48 1.00
Feb. 21 06 48.86 +34 18.2 0.434 1.301 9.3 192.8/279 127.8 67 0.98
Feb. 22 06 33.39 +34 43.6 0.463 1.304 9.5 169.0/276 123.7 84 0.93
Feb. 23 06 19.72 +34 59.7 0.492 1.306 9.6 148.4/274 119.9 101 0.86
Feb. 24 06 07.66 +35 09.1 0.523 1.309 9.8 130.7/273 116.4 118 0.78
Feb. 25 05 57.01 +35 13.5 0.555 1.312 9.9 115.4/271 113.3 133 0.68
Feb. 26 05 47.58 +35 14.4 0.588 1.315 10.0 102.4/270 110.4 147 0.57
Feb. 27 05 39.23 +35 12.9 0.621 1.319 10.2 91.1/269 107.7 159 0.47
Feb. 28 05 31.81 +35 09.7 0.654 1.322 10.3 81.3/267 105.2 165 0.37
m1 = 10.0 + 5 log(Delta) + 10.0 log(r)