Comet P/2013 O2 = 2020 O4 (PANSTARRS) 中野主一氏 (中央局)は、MPECs 2020-P19、2020-Q175と2020-R04の6夜(2020年7月30日-8月23日) に及ぶP/2013 O2 (CBET 3604参照)の検出観測を確認した。 Mt Lemmonサーベイによる初期の検出位置は次のとおり、 2020 UT R.A. (2000) Decl. Mag. July 30.36439 22 44 54.60 + 8 21 36.6 19.9 30.37161 22 44 54.45 + 8 21 36.6 20.0 30.37881 22 44 54.31 + 8 21 36.5 20.0 30.38602 22 44 54.16 + 8 21 36.3 20.0 Aug. 13.32345 22 38 45.08 + 8 00 52.9 19.3 13.32815 22 38 44.96 + 8 00 52.2 19.2 13.33284 22 38 44.75 + 8 00 51.8 19.5 13.33753 22 38 44.57 + 8 00 50.9 19.5 NK 2634とICQ's 2020 Comet Handbookの中野主一氏の予報に対し、Delta(T)は、-0.09 dayで あった。MPC 87479のG. V. Williamsの予報に対するDelta(T)は-0.13 dayであった。 MPCの連結軌道要素、位置推算表は次のとおり、 Orbital elements: P/2013 O2 (PANSTARRS) Epoch 2013 Dec. 14.0 TT = JDT 2456640.5 T 2013 Dec. 16.37543 TT Rudenko q 2.1459680 (2000.0) P Q n 0.13172795 Peri. 213.74384 +0.48533644 -0.86776816 a 3.8254638 Node 207.67455 +0.84441272 +0.49692208 e 0.4390306 Incl. 13.30642 +0.22675030 +0.00684536 P 7.48 From 201 observations 2013 July 16-2020 Aug. 23, mean residual 0".7. P/2013 O2 (PANSTARRS) Epoch 2021 May 26.0 TT = JDT 2459360.5 T 2021 May 22.60617 TT Rudenko q 2.0960432 (2000.0) P Q n 0.13363412 Peri. 214.30100 +0.48487044 -0.86824588 a 3.7889988 Node 207.14716 +0.84516962 +0.49607527 e 0.4468082 Incl. 13.31952 +0.22491993 +0.00764279 P 7.38 From 201 observations 2013 July 16-2020 Aug. 23, mean residual 0".7. P/2013 O2 (PANSTARRS) Epoch 2028 Sept. 26.0 TT = JDT 2462040.5 T 2028 Oct. 13.34430 TT Rudenko q 2.0999769 (2000.0) P Q n 0.13337046 Peri. 214.48658 +0.48338823 -0.86911688 a 3.7939908 Node 207.05851 +0.84607278 +0.49454916 e 0.4464992 Incl. 13.31243 +0.22471464 +0.00754865 P 7.39 From 201 observations 2013 July 16-2020 Aug. 23, mean residual 0".7. P/2013 O2 (PANSTARRS) Epoch 2020 May 31.0 TT = JDT 2459000.5 T 2021 May 22.45256 TT Rudenko q 2.0969847 (2000.0) P Q n 0.13353532 Peri. 214.21308 +0.48595350 -0.86763587 a 3.7908677 Node 207.16344 +0.84452840 +0.49713690 e 0.4468325 Incl. 13.31657 +0.22499106 +0.00793126 P 7.38 From 201 observations 2013 July 16-2020 Aug. 23, mean residual 0".7. Ephemeris: Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 2020 08 08 22 41 28.7 +08 13 31 2.0591 2.9623 147.1 10.7 19.8 ... 2020 08 23 22 32 50.2 +07 22 50 1.9245 2.8963 160.2 6.8 19.5 ... 2020 08 31 22 27 21.8 +06 37 15 1.8758 2.8613 164.5 5.4 19.4 ... 2020 09 06 22 23 09.5 +05 55 48 1.8505 2.8351 164.7 5.4 19.4 2020 09 07 22 22 27.8 +05 48 22 1.8472 2.8307 164.4 5.5 19.4 2020 09 08 22 21 46.4 +05 40 48 1.8442 2.8264 164.0 5.6 19.3 ... 2020 09 14 22 17 45.4 +04 52 55 1.8317 2.8003 160.5 6.9 19.3 ... 2020 09 22 22 12 58.9 +03 44 25 1.8298 2.7657 153.7 9.3 19.2 ... 2020 10 07 22 07 02.0 +01 34 13 1.8676 2.7016 138.9 14.1 19.2 (MPEC 2020-R32、CBET 4844)