Nakano Note (Nakano wa Kangaeru noda) NK 5534 C/2025 Y1 (A/2025)
The following improved orbital elements, by S. Nakano, are from 106 observations 2025 May 1 to 2026 Jan. 6. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.37 arc seconds. The comet will pass 2.66 AU from Saturn on 2030 Mar. 27 UT. See an orbit in CBET 5651 (same orbit). Epoch = 2027 Oct. 2.0 TT T = 2027 Oct. 13.87451 +/- 0.12326 (m.e.) TT Peri. = 124.31139 +/- 0.03252 Node = 166.54837 +/- 0.00304 (2000.0) Inc. = 14.55737 +/- 0.00262 q = 2.6005456 +/- 0.0019901 AU e = 1.0000920 +/- 0.0002612 1/a = -0.0000354 +/- 0.0001004 1/AU origin = +0.000232 (Q= 7) future = -0.000488 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2025/ 251228 G40 0.1+ 0.1+ 251231 Q21 0.2- 0.3- 250501 W84 0.3- 0.2+ 251228 G40 0.2+ 0.1- 251231 Q21 0.2- 0.2+ 250502 W84 0.3+ 0.2- 251228 I41 0.3- 0.8- 2026/ 250504 W84 0.1- 0.2+ 251228 U94 0.2- 0.1- 260101 204 0.0 0.0 250505 W84 0.1+ 0.1- 251228 U94 0.0 0.0 260101 204 0.0 0.0 251119 O18 0.1- 0.0 251228 U94 0.2+ 0.2- 260101 204 0.1+ 0.1- 251119 O18 0.0 0.1+ 251229 G00 0.5- 0.4+ 260101 W05 0.0 0.1+ 251119 O18 0.2- 0.1+ 251229 G00 0.2+ 0.2+ 260101 W05 0.2+ 0.3+ 251226 T05 0.3+ 0.7+ 251229 G00 0.2- 0.2+ 260101 W05 0.1- 0.5- 251226 T05 0.6- 1.2- 251229 Z17 0.1+ 0.1- 260102 M58 0.2+ 0.0 251226 T05 0.3- 0.3- 251229 Z17 0.1- 0.1- 260102 M58 0.1+ 0.0 251226 T05 0.0 0.8+ 251229 Z17 0.0 0.0 260102 M58 0.1+ 0.0 251226 T05 0.2+ 0.3- 251229 W86 0.0 0.1- 260103 I47 0.2- 0.1- 251226 T05 0.2+ 0.3- 251229 W86 0.0 0.1- 260103 I47 0.3- 0.1+ 251226 T05 0.5+ 0.4- 251229 W86 0.0 0.2- 260103 Q21 (0.5- 2.9-) 251227 Z17 0.1+ 0.1- 251229 W86 0.0 0.2- 260103 Q21 1.7- 0.4+ 251227 Z17 0.1+ 0.0 251229 P13 0.0 0.1- 260103 Q21 (1.5+ 2.4+) 251227 Z17 0.3- 0.1+ 251229 P13 0.0 0.1+ 260103 Q21 1.4- 1.0+ 251227 T05 0.6+ 0.3- 251229 P13 0.1- 0.2- 260104 M49 0.1+ 0.1- 251227 F52 0.1+ 0.0 251230 S47 0.4+ 0.4+ 260104 M49 0.1- 0.1- 251227 T05 0.3+ 0.2+ 251230 S47 0.1+ 0.3- 260104 M49 0.0 0.1- 251227 T05 0.4+ 0.3- 251230 S43 0.3+ 0.3+ 260104 W05 0.3+ 0.1+ 251227 T05 0.3- 0.2- 251230 S47 0.1+ 0.2- 260104 W05 0.1+ 0.2- 251227 F52 0.1+ 0.0 251230 S43 0.2- 1.6+ 260104 W05 0.0 0.0 251227 F52 0.1+ 0.1- 251230 S43 1.5- 1.8+ 260105 M49 0.3+ 0.2- 251227 F52 0.0 0.1- 251230 M45 0.1- 0.6+ 260105 M49 0.3+ 0.2+ 251227 P13 0.1- 0.2- 251230 M45 0.2- 0.3+ 260105 M49 0.2+ 0.0 251227 P13 0.4- 0.1+ 251230 M45 0.6- 0.0 260105 O18 0.2+ 0.3- 251227 P13 0.1+ 0.2- 251230 X07 0.2+ 0.4- 260105 O18 0.0 0.3- 251228 R17 0.4- 0.2- 251230 X07 0.2+ 0.3- 260105 O18 0.0 0.3- 251228 R17 0.4- 0.1- 251231 G40 0.4+ 0.0 260106 M49 0.0 0.2- 251228 R17 0.5+ 0.0 251231 G40 0.2+ 0.1+ 260106 M49 0.4+ 0.0 251228 K62 0.2- 0.3+ 251231 G40 0.1+ 0.0 260106 M49 0.3+ 0.1- 251228 K62 0.1- 0.2- 251231 W05 0.0 0.0 260106 Y76 0.6+ 0.4- 251228 R17 0.2+ 0.2+ 251231 W05 0.5+ 0.2+ 260106 Y76 0.4+ 0.0 251228 K62 0.1- 0.2- 251231 W05 0.2+ 0.2- 260106 Y76 0.2+ 0.7- 251228 K62 0.2- 0.0 251231 Q21 0.7+ 0.4+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2026 Jan. 11