Nakano Note (Nakano wa Kangaeru noda) NK 4548 P/2021 Q5 (ATLAS)
The following improved orbital elements, by S. Nakano, are from 161 observations 2021 Aug. 29 to Sept. 26. 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. Period is still uncertainty within +/- one week or more, so that the close approaches below are necessary uncertainty. But this orbit shows comet has made a close approach 0.036 AU to Jupiter on 2019 Jan. 4 UT, before this approach comet had an orbit of T= 2010 Feb. 11, q= 3.194 AU, e= 0.372, Peri.= 122.5, Node= 246.2, i= 11.5, a= 5.088 AU, P= 11.5 years. Also comet will pass 0.028 AU from Jupiter on 2030 Sept. 19 UT, after this approach comet will have an orbit of T= 2036 June 5, q= 2.292, e= 0.448, Peri.= 19.5, Node= 70.8, i= 5.6, a= 4.154 AU, P= 8.47 years. Thus angular elements will be dramatically changed at this approach. See an orbit in CBET 5029. CCD total magnitudes have been reported. 2021 Sept. 19, mag.= 14.3 (K. Kadota, Ageo), 14.0 (H. Abe, Yatsuka), Sept. 26, 14.2 (Kadota). Epoch = 2021 Aug. 14.0 TT T = 2021 Aug. 30.40909 +/- 0.02026 (m.e.) TT Peri. = 180.87266 +/- 0.01856 Node = 239.76329 +/- 0.01179 (2000.0) Inc. = 10.73336 +/- 0.00110 q = 1.2342237 +/- 0.0002839 AU e = 0.6232700 +/- 0.0007669 a = 3.2761493 +/- 0.0067118 AU n' = 0.16621053 +/- 0.00051077 P = 5.930 +/- 0.0182227 years (+/- 6.66 days) The predicted orbit for the 2027 return is as follows: T = 2027 Aug. 8.40071 TT Epoch = 2027 Aug. 23.0 TT Peri. = 180.98499 e = 0.6232916 Node = 239.70493 (2000.0) a = 3.2770288 AU Inc. = 10.73485 n'= 0.16614363 q = 1.2344844 AU P = 5.932 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210903 G18 0.6+ 0.7+ 210909 349 0.0 0.3+ 210829 T05 0.5+ 0.1+ 210903 C10 0.3- 0.4+ 210909 Q11 0.1- 0.0 210829 T05 0.1+ 0.5+ 210903 C10 0.5- 0.2+ 210909 349 0.6- 0.3- 210829 T05 0.1+ 0.2+ 210903 C10 1.0- 0.1+ 210909 Q11 0.1- 0.1+ 210829 T05 0.2+ 0.0 210903 G40 0.1- 0.0 210909 Q11 0.0 0.1+ 210830 I41 0.4- 0.0 210903 G40 0.2- 0.2- 210910 G18 0.2- 0.5- 210830 I41 0.5- 0.2+ 210903 G40 0.6- 0.5+ 210910 G18 0.9+ 0.3- 210830 I41 0.8- 0.3+ 210904 K74 0.7+ 0.4- 210910 T05 0.1- 0.0 210830 I41 0.5- 0.1+ 210904 K74 0.8+ 0.1- 210910 T05 0.1+ 0.2- 210830 Q63 0.1- 0.2- 210904 K74 0.9+ 0.3- 210910 T05 0.5- 0.2- 210830 Q63 0.0 0.3- 210904 K74 0.4+ 0.0 210910 T05 0.7+ 0.1- 210830 Q63 0.0 0.3- 210904 K74 0.5+ 0.0 210911 A77 (2.1+ 0.8-) 210831 L01 1.2+ 0.4+ 210904 033 0.6+ 0.1- 210911 A77 (2.3+ 0.8-) 210831 L01 0.7+ 0.3- 210904 033 0.7+ 0.0 210911 A77 (2.2+ 0.2+) 210831 L01 1.2+ 0.1+ 210904 033 0.8+ 0.1- 210911 A77 1.4+ 0.2- 210831 L01 1.5+ 0.0 210904 033 0.8+ 0.2- 210912 A77 1.6+ 0.7- 210831 L01 1.3+ 0.4- 210904 I89 0.5- 0.7+ 210912 J01 1.1+ 0.1+ 210831 Z17 0.4+ 0.1- 210904 I89 1.2+ 0.5- 210912 A77 1.2+ 0.3- 210831 Z17 (2.3+ 0.2-) 210904 I89 0.5- 0.3+ 210912 A77 1.0+ 0.3- 210901 C10 0.2- 1.9+ 210904 I89 0.9- 0.1- 210912 J01 0.1+ 0.3+ 210901 C10 0.7- 0.5- 210904 I89 1.2- 0.4+ 210912 J01 0.8- 0.7- 210901 L06 0.3- 0.2+ 210905 A71 0.3- 0.3+ 210912 J01 0.6+ 0.6- 210901 C10 0.3- 0.5+ 210905 A71 0.1- 0.3+ 210912 Z10 0.3+ 0.7- 210901 L06 0.1+ 0.3+ 210905 A71 0.4- 0.7+ 210912 Z10 1.5+ 0.5- 210901 C10 0.6- 0.5+ 210905 595 (2.4- 0.2-) 210912 T08 1.2- 0.1+ 210901 L06 0.1+ 0.3+ 210905 595 (2.1- 0.3-) 210912 T08 0.3- 0.2+ 210901 L06 0.6+ 0.3- 210905 595 1.7- 0.6+ 210912 T08 0.7- 0.0 210901 204 0.0 0.0 210905 A77 1.3+ 0.7+ 210912 T08 0.5- 0.2+ 210901 204 0.2- 0.3+ 210905 215 0.5- 0.0 210912 T08 0.2- 0.3- 210901 C10 0.7- 0.4+ 210905 215 0.3- 0.1- 210912 T08 0.7- 0.2- 210901 C10 0.8- 0.8+ 210905 215 0.0 0.2- 210912 T08 0.3- 0.1- 210901 204 0.1+ 0.2+ 210905 A77 0.6+ 0.1+ 210913 G40 0.2- 0.4- 210901 G40 0.2- 0.0 210905 A77 0.6+ 0.1- 210913 G40 0.4+ 0.2- 210901 G40 0.2- 0.2+ 210905 Y00 0.0 1.3+ 210915 G40 1.0- 0.2+ 210901 G40 0.1- 0.1+ 210905 Y00 0.0 0.6+ 210915 G40 0.3- 0.1+ 210901 G40 0.4- 0.1- 210905 Y00 0.2+ 0.3- 210915 G40 0.4+ 0.8+ 210901 G40 0.3+ 0.0 210906 157 0.0 0.4- 210916 703 0.3- 0.1+ 210901 G40 0.2- 0.3- 210906 157 0.1+ 0.1- 210916 703 0.8- 0.7+ 210901 G40 0.3+ 0.2+ 210906 157 0.0 0.3+ 210916 703 0.9- 0.9+ 210902 C10 0.1- 0.4+ 210906 970 0.5- 0.5+ 210916 703 0.8- 0.4+ 210902 C10 0.3- 0.3+ 210906 970 1.1+ 0.4- 210919 A77 0.1- 0.1- 210902 C10 0.4- 0.1- 210907 970 0.8+ 0.1- 210919 A77 0.5+ 0.0 210903 A71 1.0- 0.2- 210907 970 0.5+ 0.6- 210919 A77 0.8+ 0.1+ 210903 A71 1.2- 0.2+ 210907 H06 1.6+ 0.5+ 210919 Q23 0.4- 0.1- 210903 A71 0.8- 0.2- 210907 H06 0.0 0.3+ 210919 Q23 0.6- 0.1- 210903 A71 0.4- 0.1+ 210907 H06 0.6- 1.4- 210919 349 0.0 0.1- 210903 K62 0.2- 0.1- 210907 H06 0.3- 0.2+ 210919 349 0.0 0.1- 210903 104 0.2- 0.3+ 210907 H06 0.3+ 0.4- 210919 Q23 0.1- 0.2- 210903 K62 0.4+ 0.1- 210908 I81 0.8+ 0.4- 210919 367 0.4- 0.2+ 210903 K62 0.1+ 0.3- 210908 I81 0.5- 0.1- 210919 367 0.0 0.1- 210903 104 0.4- 0.1+ 210908 I81 0.6- 0.1+ 210919 367 0.0 0.1- 210903 033 0.2+ 0.1+ 210908 703 (3.1- 1.1+) 210924 A77 1.1+ 0.4- 210903 033 0.0 0.0 210908 703 0.9- 0.1- 210924 A77 1.0+ 0.6- 210903 033 0.1- 0.1+ 210908 703 1.7- 0.2+ 210926 349 0.5- 0.4+ 210903 033 0.0 0.2+ 210908 703 1.2- 0.1- 210926 349 0.1- 0.9+ 210903 033 0.1- 0.1+ 210909 A71 0.6+ 0.4+ 210903 G18 0.1- 0.3+ 210909 A71 0.5+ 0.4- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Sept. 30