Nakano Note (Nakano wa Kangaeru noda) NK 4415 P/2019 GG21 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 60 observations 2019 Jan. 11 to Apr. 25. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.51 arc second. The comet will pass 2.61 AU from Saturn on 2024 June 17 and 0.51 AU from Jupiter on 2038 Apr. 29 UT. See an orbit in HICQ 2020. Epoch = 2019 Apr. 27.0 TT T = 2019 May 12.67152 +/- 0.31243 (m.e.) TT Peri. = 208.77068 +/- 0.04379 Node = 340.57905 +/- 0.00402 (2000.0) Inc. = 6.07535 +/- 0.00128 q = 3.9317297 +/- 0.0003194 AU e = 0.4739792 +/- 0.0000594 a = 7.4744756 +/- 0.0010402 AU n' = 0.04823175 +/- 0.00001007 P = 20.435 +/- 0.0042660 years (+/- 1.56 days) The predicted orbit for the 2039 return is as follows: T = 2039 Sept.20.19431 TT Epoch = 2039 Sept. 9.0 TT Peri. = 209.74791 e = 0.4891522 Node = 332.73370 (2000.0) a = 8.0120836 AU Inc. = 6.87059 n'= 0.04345961 q = 4.0929555 AU P = 22.679 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2019/ 190405 I52 1.1+ 0.1+ 190410 033 0.0 0.3+ 190111 309 0.2+ 0.0 190405 Q62 0.3- 0.2- 190411 I52 0.5- 0.0 190111 309 0.0 0.1+ 190405 Q62 0.2- 0.1+ 190411 I52 0.3- 0.3+ 190111 309 0.1+ 0.1- 190405 Q62 0.4- 0.0 190411 I52 0.3- 0.4- 190111 309 0.4- 0.4- 190405 033 0.6- 0.1- 190411 I52 0.5- 0.7+ 190111 309 0.0 0.1+ 190405 033 0.2- 0.1- 190412 711 1.1+ 0.1+ 190329 G96 0.8+ 0.3+ 190406 L01 0.0 0.3+ 190412 711 0.8+ 0.2+ 190329 G96 0.3- 0.7+ 190406 L01 0.4+ 0.5+ 190412 711 0.5+ 0.0 190329 G96 0.2- 0.8+ 190406 L01 0.7- 0.5+ 190413 691 0.1- 0.5- 190329 G96 0.3- 1.1+ 190406 A71 1.5- 0.3+ 190413 691 0.8+ 0.3+ 190404 807 0.2+ 0.1- 190406 A71 1.3- 0.2+ 190413 691 0.3- 0.1- 190404 F51 0.4+ 0.1- 190406 A71 0.9- 0.2+ 190414 691 0.7+ 0.1+ 190404 F51 0.0 0.1- 190406 A71 1.2- 0.5+ 190414 691 0.2+ 0.2+ 190404 F51 0.1+ 0.0 190407 I52 0.1- 0.4+ 190414 691 0.4+ 0.0 190404 F51 0.2+ 0.0 190407 I52 0.0 0.6+ 190424 215 0.7- 0.4- 190405 807 0.3- 0.6- 190407 I52 0.5- 0.7+ 190424 215 0.5- 0.0 190405 807 0.3- 0.0 190408 G40 0.4- 0.6- 190424 215 0.8- 0.7+ 190405 807 0.0 0.0 190408 G40 1.1- 0.4- 190425 461 0.6+ 1.0- 190405 807 0.2+ 0.1- 190410 033 0.1+ 0.1- 190425 461 1.5+ 0.1+ 190405 I52 0.2+ 0.9+ 190410 033 0.5- 0.1+ 190405 I52 0.1+ 0.8+ 190410 033 0.1- 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Mar. 22

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