Nakano Note (Nakano wa Kangaeru noda) NK 4634 C/2021 R7 (PANSTARRS)
The following improved orbital elements, by S. Nakano, are from 53 observations 2021 Aug. 7 to 2022 Jan. 5. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.29 arc second. 2022 observations show the residuals of +19" for Right Ascension and +10" for Declination from a recent orbit since observations on 2021 Oct. 29 are not good. The comet will pass 1.35 AU from Jupiter on 2022 May 6 and 2.29 AU from Saturn on 2023 June 3 UT. See an orbit in CBET 5050. Epoch = 2021 Apr. 16.0 TT T = 2021 Apr. 14.11086 +/- 0.01129 (m.e.) TT Peri. = 139.95811 +/- 0.00134 Node = 170.14611 +/- 0.00024 (2000.0) Inc. = 158.85311 +/- 0.00019 q = 5.6401330 +/- 0.0000465 AU e = 0.9948463 +/- 0.0001152 1/a = +0.0009138 +/- 0.0000204 1/AU origin = +0.001227 (Q= 7) future = +0.001232 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210908 A71 0.3+ 0.5- 211002 F51 0.1- 0.4- 210807 F51 0.0 0.1- 210912 L01 0.9+ 1.1+ 211003 F51 0.0 0.0 210807 F51 0.3+ 0.3+ 210912 L01 0.2+ 0.9+ 211003 F51 0.1- 0.2- 210807 F51 0.0 0.2- 210912 L01 0.5+ 0.7+ 211003 F51 0.2- 0.2+ 210807 F51 0.3+ 0.1+ 210913 L01 0.0 0.2- 211003 F51 0.1- 0.3- 210905 F52 0.2- 0.1+ 210913 L01 0.0 0.2- 211003 F51 0.4+ 0.0 210905 F52 0.1- 0.1- 210913 L01 0.1+ 0.0 211007 G96 0.3- 0.1- 210905 F52 0.3- 0.2+ 210913 L01 0.2- 0.0 211007 G96 0.1+ 0.3- 210905 F51 0.1+ 0.0 210915 F51 0.3+ 0.0 211007 G96 0.0 0.2+ 210905 F51 0.0 0.3- 210915 F51 0.1+ 0.1+ 211007 G96 0.2+ 0.3+ 210906 H21 0.7- 0.2+ 210929 691 0.1+ 0.9+ 211029 H06 (2.5- 0.8-) 210906 H21 0.5- 0.1- 210929 691 0.6+ 0.5+ 211029 H06 (2.5- 1.2-) 210906 H21 0.3- 0.2+ 210929 691 0.2- 0.7+ 211107 F52 0.1- 0.2- 210907 H06 0.3+ 0.9- 211001 I89 0.1- 0.1- 211107 F52 0.2+ 0.0 210907 H06 0.4- 1.3- 211001 I89 0.3+ 0.3+ 211107 F52 0.0 0.0 210907 568 0.3- 0.2- 211002 F52 0.3- 0.2- 2022/ 210907 568 0.2- 0.2- 211002 F52 0.2- 0.3- 220105 568 0.0 0.0 210907 568 0.2- 0.2- 211002 F52 0.2- 0.1- 220105 568 0.1- 0.0 210908 A71 0.3+ 0.1+ 211002 F52 0.4- 0.0 220105 568 0.0 0.0 ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2022 Feb. 12