Nakano Note (Nakano wa Kangaeru noda) NK 5558 P/2009 DP2 = C1CMKZ5 (in PCCP object)
T. Kobayashi has identified a candidate of comet C1CMKZ5 in PCCP with a Minor planet 2009 DP2. If C1CMKZ5 is confirmed a comet, this Minor Planet seems to be a comet. The following improved orbital elements, by S. Nakano, are from 64 observations 2009 to 2026. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.42 arc second. Epoch = 2025 Sept. 2.0 TT T = 2025 Sept.11.65888 +/- 0.02286 (m.e.) TT Peri. = 127.84731 +/- 0.00339 Node = 0.11316 +/- 0.00019 (2000.0) Inc. = 26.75624 +/- 0.00023 q = 3.8224105 +/- 0.0000318 AU e = 0.4258515 +/- 0.0000053 a = 6.6575292 +/- 0.0000825 AU n' = 0.05737655 +/- 0.00000107 P = 17.178 +/- 0.0003191 years (+/- 0.12 day) T = 2008 June 14.67083 TT Epoch = 2008 June 23.0 TT Peri. = 126.63988 e = 0.4226220 Node = 0.80913 (2000.0) a = 6.6802210 AU Inc. = 26.98991 n'= 0.05708445 q = 3.8570128 AU P = 17.266 years The predicted orbit for the 2042 return is as follows: T = 2042 Sept. 3.93507 TT Epoch = 2042 Aug. 24.0 TT Peri. = 127.80304 e = 0.4234762 Node = 359.99350 (2000.0) a = 6.5800965 AU Inc. = 26.83943 n'= 0.05839231 q = 3.7935823 AU P = 16.879 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2009/ 090404 493 0.2+ 0.3- 260131 F51 0.1+ 0.3+ 090217 A77 0.8+ 1.3+ 090404 493 0.2- 0.3- 260206 F51 0.3+ 0.2- 090217 A77 0.4+ 0.3+ 090404 493 0.4+ 0.4- 260206 F51 0.3+ 0.1+ 090217 A77 0.2+ 0.4+ 090404 J95 0.4- 0.2+ 260206 F52 0.3+ 0.1+ 090220 A77 0.1+ 0.2+ 090404 J95 0.6- 0.3+ 260206 F52 0.1+ 0.1- 090220 A77 0.1- 0.6- 090405 H55 0.2- 0.5- 260206 F52 0.2+ 0.1- 090220 A77 0.4- 0.3+ 090405 H55 0.1- 0.6- 260206 F52 0.2- 0.1+ 090327 G96 0.1- 0.3- 090405 H55 0.1- 0.3- 260226 V00 0.2- 0.1+ 090327 G96 0.1+ 0.5- 2026/ 260226 V00 0.2- 0.1+ 090327 G96 0.2- 0.3- 260114 V00 0.3- 0.1+ 260226 V00 0.0 0.0 090327 G96 0.0 0.2- 260114 V00 0.4+ 0.2- 260226 V00 0.1+ 0.1+ 090328 703 0.7- 1.1- 260118 F52 0.3- 0.1- 260226 V00 0.1+ 0.1+ 090328 703 0.7- 0.4+ 260118 F52 0.1- 0.1+ 260227 I52 0.4- 0.9+ 090328 703 0.6- 0.3- 260118 F52 0.0 0.3+ 260227 I52 0.7- 0.1+ 090328 703 1.7- 1.6+ 260118 F52 0.0 0.2- 260227 I52 0.2- 0.3- 090404 H55 0.5+ 0.1- 260128 F52 0.1- 0.0 260227 F52 0.1+ 0.3+ 090404 H55 0.6+ 0.3- 260128 F52 0.2+ 0.6- 260227 I52 0.6+ 0.0 090404 H55 0.5+ 0.2+ 260128 F52 0.2- 0.2+ 260227 F52 0.2- 0.2+ 090404 H55 0.5+ 0.2- 260128 F52 0.1- 0.1- 260228 I52 0.5- 0.2+ 090404 850 1.2+ 0.4+ 260130 F51 0.2+ 0.2- 260228 I52 0.1+ 0.2- 090404 850 0.4+ 0.2+ 260130 F51 0.3+ 0.3- 260228 I52 0.1- 0.2+ 090404 850 0.1+ 0.2+ 260131 F51 0.1- 0.5- 260228 I52 0.6+ 0.3- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2026 Mar. 3