Nakano Note (Nakano wa Kangaeru noda) NK 5432 P/PANSTARRS (2012 T2 = P12d0TP)
T. Kobayashi, Oizumi, has identified the following object with P/2012 T2. PK12T020 C2025 07 24.54178823 14 14.822-20 59 30.67 P12d0TP 21.6 G F51 PK12T020 C2025 07 24.55062123 14 14.719-20 59 32.48 P12d0TP 21.4 G F51 PK12T020 C2025 07 24.55948323 14 14.622-20 59 34.32 P12d0TP 21.5 G F51 PK12T020 C2025 07 24.56833423 14 14.518-20 59 36.36 P12d0TP 21.4 G F51 PK12T020 C2025 08 02.52215723 11 58.673-21 34 07.05 P12d0TP 21.4 w F52 PK12T020 C2025 08 02.54114523 11 58.302-21 34 11.37 P12d0TP 21.3 w F52 PK12T020 C2025 08 02.55064023 11 58.127-21 34 13.68 P12d0TP 21.4 w F52 PK12T020* C2025 08 17.52904323 06 20.000-22 33 09.11 P12d0TP 21.0 w F51 PK12T020 C2025 08 17.53947723 06 19.710-22 33 11.71 P12d0TP 20.9 w F51 PK12T020 C2025 08 17.54992023 06 19.439-22 33 13.85 P12d0TP 20.6 w F51 PK12T020 C2025 08 17.56037423 06 19.135-22 33 16.49 P12d0TP 21.1 w F51 PK12T020 C2025 08 17.61316623 06 17.717-22 33 28.42 P12d0TP 20.6 G F51 PK12T020 C2025 08 17.61381223 06 17.725-22 33 28.35 P12d0TP 21.4 G F51 PK12T020 C2025 08 17.61446723 06 17.650-22 33 28.84 P12d0TP 21.2 G F51 The following improved orbital elements, by S. Nakano, are from 51 observations 2012 to 2025. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.46 arc second. Because of the short arc (only 34 days), residuals on 2025 July 24 observations were +1.80 deg for Right Ascension and +0.76 deg for Declination from the prediction in HICQ 2013 (= CH 2025) with the delta-T correction = -17.9 days. The comet has passed 0.060 AU from Jupiter on 2001 May 17 UT, before this close approach, comet had an orbit of T= 1984 04 22, q= 4.91 AU, e= 0.28, Peri.= 15.0, Node= 98.5, i= 7.0, a= 6.85 AU, P= 17.9 years. Epoch = 2026 Nov. 16.0 TT T = 2026 Dec. 5.44600 +/- 0.25154 (m.e.) TT Peri. = 308.78505 +/- 0.02691 Node = 73.72087 +/- 0.00101 (2000.0) Inc. = 12.57038 +/- 0.00007 q = 4.8009383 +/- 0.0002198 AU e = 0.1568571 +/- 0.0000386 a = 5.6940983 +/- 0.0003685 AU n' = 0.07253818 +/- 0.00000704 P = 13.587 +/- 0.0013191 years (+/- 0.48 day) T = 2013 Mar. 25.90570 TT Epoch = 2013 Mar. 9.0 TT Peri. = 307.71288 e = 0.1568643 Node = 73.78455 (2000.0) a = 5.7259093 AU Inc. = 12.55801 n'= 0.07193452 q = 4.8277186 AU P = 13.701 years The predicted orbit for the 2040 return is as follows: T = 2040 May 28.48295 TT Epoch = 2040 June 15.0 TT Peri. = 308.22622 e = 0.1562992 Node = 73.59853 (2000.0) a = 5.6517636 AU Inc. = 12.59187 n'= 0.07335472 q = 4.7683975 AU P = 13.436 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121014 568 0.2+ 0.2- 121107 215 0.4- 0.1- 121010 F51 0.3- 0.1- 121015 304 0.1+ 0.1- 121113 H06 0.9- 0.8+ 121010 F51 0.2- 0.2- 121015 304 0.0 0.1+ 121113 H06 0.8- 0.7+ 121010 F51 0.3- 0.1+ 121015 304 0.1+ 0.2- 2025/ 121010 F51 0.2- 0.2- 121015 304 0.1+ 0.2- 250724 F51 0.3- 0.2- 121011 H06 0.8- 0.9+ 121015 J04 0.4+ 1.0+ 250724 F51 0.2- 0.0 121011 H06 1.4- 0.9+ 121015 J04 0.6- 0.5+ 250724 F51 0.1+ 0.1+ 121011 H06 (2.0- 0.8+) 121015 J04 0.3- 0.0 250724 F51 0.2+ 0.1+ 121011 F65 0.1- 0.0 121017 568 0.3+ 0.0 250802 F52 0.1+ 0.2- 121011 F65 0.2- 0.1- 121017 568 0.4+ 0.0 250802 F52 0.0 0.0 121013 291 0.2- 1.3+ 121017 568 0.4+ 0.0 250802 F52 0.1+ 0.1- 121013 291 0.3+ 0.4+ 121021 372 0.2+ 0.3+ 250817 F51 0.0 0.2+ 121014 291 0.5- 1.0+ 121021 372 0.2+ 0.7+ 250817 F51 0.1- 0.0 121014 291 0.3+ 0.9+ 121021 372 0.4+ 0.5+ 250817 F51 0.1+ 0.2+ 121014 291 0.0 0.3+ 121022 C10 0.9- 0.4+ 250817 F51 0.2- 0.1- 121014 H06 0.8- 0.7+ 121022 C10 0.9+ 0.0 250817 F51 0.1+ 0.0 121014 H06 1.1- 0.7+ 121107 215 0.3- 0.9+ 250817 F51 0.4+ 0.2+ 121014 568 0.4+ 0.2- 121107 215 0.2- 0.4+ 250817 F51 0.3- 0.2- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 Sept. 8