Nakano Note (Nakano wa Kangaeru noda) NK 5602 P/ZTF (2021 N1 = 2026 M1)
The following improved orbital elements, by S. Nakano, are from 117 observations 2021 to 2026. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.54 arc second. Residuals for the recovery observations were -4.0 deg for Right Ascension and -7.5 deg for Declination with the delta-T correction = +1.5 days from the new prediction in NK 5576 (The prediction in Comet Handbook 2026 was the delta-T correction = +2.1 days). The comet has passed 0.52 AU from Jupiter on 2003 Apr. 6 and will pass 0.17 AU from the Earth on 2026 June 29. Also comet will pass 0.82 AU from Jupiter on 2038 Sept. 7 UT. Epoch = 2026 July 19.0 TT T = 2026 July 28.48699 +/- 0.00011 (m.e.) TT Peri. = 21.21972 +/- 0.00018 Node = 301.11368 +/- 0.00013 (2000.0) Inc. = 11.48539 +/- 0.00003 q = 0.9663168 +/- 0.0000008 AU e = 0.6758212 +/- 0.0000003 a = 2.9808141 +/- 0.0000035 AU n' = 0.19151453 +/- 0.00000033 P = 5.146 +/- 0.0000090 years T = 2021 June 6.55768 TT Epoch = 2021 May 26.0 TT Peri. = 21.19089 e = 0.6769307 Node = 301.14414 (2000.0) a = 2.9776785 AU Inc. = 11.50455 n'= 0.19181712 q = 0.9619964 AU P = 5.138 years The predicted orbit for the 2031 return is as follows: T = 2031 Sept.18.85805 TT Epoch = 2031 Sept.11.0 TT Peri. = 21.18619 e = 0.6749825 Node = 301.09418 (2000.0) a = 2.9828445 AU Inc. = 11.47071 n'= 0.19131902 q = 0.9694766 AU P = 5.152 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210707 N51 0.1+ 0.0 210710 I41 0.0 0.2- 210617 I41 0.3+ 0.0 210707 N51 0.6- 0.6- 210710 I41 0.5- 0.4- 210617 I41 0.3- 0.3+ 210707 N51 0.2- 0.7- 210710 I41 0.1+ 0.3+ 210617 I41 0.2+ 0.0 210708 033 1.1- 0.3+ 210710 I41 0.2- 0.2- 210617 I41 0.7+ 0.2+ 210708 033 0.7- 0.3+ 210710 I41 0.1+ 0.2+ 210617 I41 1.8+ 0.2- 210708 A77 0.6+ 0.9+ 210711 J13 1.3+ 0.8+ 210702 I41 1.1- 0.4- 210708 A77 0.6+ 1.0+ 210711 J13 0.2+ 0.4+ 210702 I41 0.9- 0.3- 210708 J13 1.0+ 0.7+ 210711 J13 1.0+ 0.6+ 210702 I41 0.7- 0.3- 210708 J13 0.5- 0.2+ 210711 I41 0.5- 0.2- 210702 I41 0.8- 0.1- 210708 J13 (0.8+ 2.4+) 210711 I41 0.1+ 0.0 210704 I41 1.2- 0.5- 210708 U83 0.1+ 0.0 210711 I41 0.1+ 0.1+ 210704 I41 0.7- 0.5- 210708 U83 0.3+ 0.3+ 210711 I41 0.2+ 0.2+ 210704 I41 0.5- 0.4- 210708 U83 0.7+ 0.8- 210711 I41 0.4+ 0.2+ 210705 I41 1.2+ 0.1- 210708 U83 0.9+ 0.4+ 210712 215 1.3- 1.2+ 210705 I41 1.4+ 0.3- 210708 U83 1.0+ 0.4+ 210712 215 1.9- 0.6+ 210706 Q62 0.5- 0.3- 210708 U83 0.7+ 0.5- 210712 215 (4.1- 1.4+) 210706 Q62 0.5- 0.4- 210708 U83 0.2+ 0.4+ 2026/ 210706 Q62 0.3- 0.1- 210708 U83 0.5+ 0.2+ 260622 T08 0.1- 0.0 210707 A71 (2.2- 0.2-) 210708 U83 0.4+ 0.5- 260622 T08 0.2- 0.1- 210707 A71 (2.6- 1.1-) 210708 U83 0.6+ 0.7+ 260622 T08 0.2- 0.1- 210707 L01 1.2- 0.4+ 210708 U83 0.0 0.0 260622 T08 0.1- 0.1+ 210707 L01 0.9- 0.3+ 210708 U83 0.8+ 0.4+ 260623 X07 0.2+ 0.1+ 210707 L01 0.4+ 0.1- 210708 U83 0.4- 0.9- 260623 X07 0.3+ 0.4+ 210707 L01 0.1- 0.8+ 210708 U83 0.7+ 0.4+ 260623 X07 0.4+ 0.1- 210707 L01 0.4- 0.4+ 210709 J04 1.1- 0.3- 260623 X07 0.4+ 0.2+ 210707 L01 0.6- 0.0 210709 J04 0.2+ 0.1+ 260623 Q62 0.6+ 0.1+ 210707 L81 0.7- 1.4- 210709 J04 1.0- 0.3- 260623 Q62 0.7+ 0.2+ 210707 L81 0.0 0.2- 210709 J13 0.5+ 0.4+ 260623 Q62 0.8+ 0.5+ 210707 G40 0.5+ 0.7- 210709 J13 0.9+ 0.4+ 260623 Q62 0.5+ 0.1+ 210707 G40 0.2+ 0.4+ 210709 J13 0.9+ 0.6+ 260623 Q62 0.5+ 0.3+ 210707 Y00 0.1+ 0.4+ 210709 J13 0.8+ 0.2- 260623 Q62 0.7+ 0.2+ 210707 Y00 0.4- 0.0 210710 L06 0.8- 0.3- 260624 950 0.5- 0.7- 210707 Y00 0.1- 0.9- 210710 L06 0.9- 0.5- 260624 950 0.1- 0.2- 210707 N51 0.7- 0.1- 210710 L06 0.2+ 0.4- 260624 W62 0.0 0.2- 210707 N51 0.4- 0.4- 210710 L06 0.1- 0.1- 260624 W62 0.1- 0.2+ 210707 N51 0.7- 0.3- 210710 G40 0.0 0.3+ 260624 W62 0.2+ 0.2+ 210707 N51 0.2- 0.4- 210710 G40 0.8+ 0.0 260626 X07 0.2+ 0.5- 210707 N51 0.7- 0.4- 210710 J13 1.5+ 0.5+ 260626 X07 0.2+ 0.6- 210707 N51 0.3- 0.1- 210710 J13 0.5+ 0.0 260626 X07 0.3+ 0.3- 210707 N51 0.4- 0.0 210710 J13 0.5+ 0.2+ 260626 X07 0.2- 0.5- 210707 N51 0.6- 0.0 210710 J13 1.3+ 0.1+ 260626 X07 0.1+ 0.5- ( ) -------- Rejected Obs.
Associate of the CBAT Late edition Syuichi Nakano 2026 June 27