Comet P/2019 X2 (PANSTARRS) R. Werykは、2019年12月31日UT、Pan-STARRS 2 (F52)によって彗星らしい天体(PCCP P20VUDB) として通報した。2".4の拡散したマとp.a.300°に10"の尾がある。 彗星機能の追加報告は次の通り： OC Date Reporter Coma Tail PA Exposures Q11 Jan. 1 H. Sato 6" 13x60s F51 Jan. 2 R. Weryk 2" 8" 305 4x45s 691 Jan. 5 A. F. Tubbiolo 20" 310 3x159s 204 Jan. 5 A. Aletti 15" 112x30s 204 Jan. 6 L. Buzzi 12" 25x60s 発見位置は次のとおり、 2019 UT R.A. (2000) Decl. Nag, Nov. 25.57618 8 21 46.65 + 7 56 01.4 22.7 25.61797 8 21 48.65 + 7 55 12.2 22.3 29.59664 8 24 53.59 + 6 37 08.7 21.0 29.61977 8 24 54.48 + 6 36 42.0 21.1 Dec. 4.57856 8 27 59.43 + 4 58 50.2 21.6 4.59134 8 27 59.80 + 4 58 34.9 21.8 4.60415 8 28 00.18 + 4 58 19.7 21.8 4.61682 8 28 00.55 + 4 58 04.7 22.1 31.45315 8 29 30.36 - 3 15 26.8 20.5 31.46533 8 29 30.04 - 3 15 38.1 20.7 31.47737 8 29 29.71 - 3 15 49.5 20.9 31.48933 8 29 29.36 - 3 16 00.8 20.6 MPCの楕円軌道要素と位置推算表は次のとおり、 Orbital elements: P/2019 X2 (PANSTARRS) Epoch 2019 Dec. 23.0 TT = JDT 2458840.5 T 2019 Dec. 9.30975 TT Bell q 1.8241035 (2000.0) P Q n 0.14176560 Peri. 213.55801 -0.22899457 -0.93847400 a 3.6426893 Node 250.85601 +0.94242340 -0.14724900 e 0.4992426 Incl. 15.88125 +0.24372036 -0.31238484 P 6.95 From 48 observations 2019 Nov. 25-2020 Jan. 9, mean residual 0".5. P/2019 X2 (PANSTARRS) Epoch 2026 Nov. 16.0 TT = JDT 2461360.5 T 2026 Nov. 15.27754 TT Bell q 1.8145661 (2000.0) P Q n 0.14228411 Peri. 213.53871 -0.22848696 -0.93853086 a 3.6338343 Node 250.84701 +0.94255276 -0.14672554 e 0.5006470 Incl. 15.89744 +0.24369653 -0.31246031 P 6.93 From 48 observations 2019 Nov. 25-2020 Jan. 9, mean residual 0".5. P/2019 X2 (PANSTARRS) Epoch 2020 May 31.0 TT = JDT 2459000.5 T 2019 Dec. 9.28789 TT Bell q 1.8240512 (2000.0) P Q n 0.14181098 Peri. 213.55006 -0.22884100 -0.93851268 a 3.6419122 Node 250.85459 +0.94244860 -0.14709764 e 0.4991501 Incl. 15.88111 +0.24376717 -0.31233994 P 6.95 From 48 observations 2019 Nov. 25-2020 Jan. 9, mean residual 0".5. Ephemeris: Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 2019 12 13 08 31 14.0 +02 13 53 1.0380 1.8244 128.8 24.9 20.7 ... 2019 12 28 08 30 42.2 -02 19 34 0.9659 1.8318 140.0 20.2 20.6 ... 2020 01 05 08 27 24.4 -04 23 04 0.9432 1.8398 145.5 17.6 20.5 ... 2020 01 11 08 23 54.2 -05 40 46 0.9341 1.8476 149.0 15.9 20.5 2020 01 12 08 23 15.3 -05 52 18 0.9332 1.8490 149.5 15.7 20.5 2020 01 13 08 22 35.4 -06 03 25 0.9326 1.8505 149.9 15.4 20.5 ... 2020 01 19 08 18 22.2 -07 00 49 0.9329 1.8602 152.1 14.3 20.5 ... 2020 01 27 08 12 33.6 -07 51 40 0.9446 1.8755 152.9 13.8 20.6 ... 2020 02 11 08 03 46.2 -08 12 26 1.0009 1.9107 148.0 15.9 20.8 (MPEC 2020-A121、CBET 4713)