Nakano Note (Nakano wa Kangaeru noda) NK 4739 268P/Bernardi

The following improved orbital elements, by S. Nakano, are from 74 observations 2004 to 2016. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.38 arc second. The comet has passed 1.08 AU from Jupiter on 2007 Nov. 25 UT. See the previous orbits in NK 1353 (= YC 2493), NK 1471, NK 2297 and NK 2331. Epoch = 2015 Apr. 8.0 TT T = 2015 Apr. 27.39550 +/- 0.00006 (m.e.) TT Peri. = 0.43830 +/- 0.00002 Node = 127.65531 +/- 0.00002 (2000.0) Inc. = 16.10097 +/- 0.00001 q = 2.4200644 +/- 0.0000003 AU e = 0.4701401 +/- 0.0000001 a = 4.5673668 +/- 0.0000007 AU n' = 0.10097300 +/- 0.00000002 P = 9.761 +/- 0.0000021 years T = 2005 Aug. 12.56570 TT Epoch = 2005 Aug. 18.0 TT Peri. = 357.31569 e = 0.4785718 Node = 129.73879 (2000.0) a = 4.4973997 AU Inc. = 15.62195 n'= 0.10333843 q = 2.3450712 AU P = 9.538 years The predicted orbit for the 2024 return is as follows: T = 2024 Dec. 18.46483 TT Epoch = 2025 Jan. 5.0 TT Peri. = 0.01089 e = 0.4746140 Node = 125.63181 (2000.0) a = 4.5921098 AU Inc. = 15.66108 n'= 0.10015801 q = 2.4126301 AU P = 9.841 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2004/ 051111 568 0.0 0.1+ 2012/ 040922 705 0.2- 0.1+ 051111 568 0.2+ 0.1+ 120813 568 0.1- 0.1+ 040922 705 0.1- 0.3+ 051112 204 0.4- 0.2- 120813 568 0.0 0.2+ 040922 705 0.1- 0.2+ 051113 568 0.1+ 0.0 120813 568 0.1- 0.1+ 041008 705 0.0 0.5+ 051113 568 0.1+ 0.0 120816 568 0.0 0.1+ 041008 705 0.1- 0.4+ 051113 568 0.2+ 0.0 120816 568 0.0 0.3+ 041008 705 0.3+ 0.3+ 051113 568 0.1+ 0.0 120816 568 0.1- 0.1+ 041016 705 0.0 0.4+ 051113 568 0.0 0.0 2014/ 041016 705 0.1- 0.3+ 051113 568 0.1+ 0.0 141224 W96 0.1- 0.5- 041016 705 0.3- 0.4+ 051201 204 1.0- 0.1+ 141224 W96 0.3- 0.7- 2005/ 051201 204 0.3- 0.1+ 141224 W96 0.4- 0.3- 051101 568 0.0 0.1+ 051229 568 0.1- 0.1+ 141224 W96 0.2+ 0.4- 051101 568 0.0 0.0 051229 568 0.1- 0.1+ 141224 W96 0.3+ 0.1- 051101 568 0.1+ 0.0 051229 568 0.0 0.0 2015/ 051101 568 0.1+ 0.0 2006/ 150117 F51 0.0 0.0 051102 568 0.1- 0.0 060402 204 0.1+ 0.1+ 150117 F51 0.0 0.1+ 051102 568 0.2- 0.0 060402 204 0.4+ 0.3- 150117 F51 0.0 0.0 051102 568 0.2- 0.1- 060428 568 0.1+ 0.1+ 150117 F51 0.1+ 0.0 051102 568 0.1- 0.1+ 060428 568 0.2+ 0.1+ 150119 F51 0.0 0.1+ 051103 568 0.3- 0.3+ 060726 568 0.2+ 0.1- 150119 F51 0.0 0.2+ 051103 568 0.4- 0.3+ 060726 568 0.2+ 0.0 150119 F51 0.0 0.0 051103 568 0.0 0.2+ 2007/ 150119 F51 0.0 0.0 051104 568 0.1- 0.0 070224 568 0.0 0.1+ 2016/ 051104 568 0.0 0.1- 070224 568 0.1+ 0.1+ 160305 F51 0.1- 0.1+ 051104 568 0.0 0.0 070224 568 0.2- 0.3+ 160305 F51 0.0 0.1+ 051104 568 0.1+ 0.0 070224 568 0.0 0.1- 160305 F51 0.1- 0.1- 051108 204 0.5+ 0.2+ 070615 568 0.0 0.2- 051111 568 0.1+ 0.1+ 070615 568 0.0 0.2- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2022 June 14

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