Comet P/2019 Y3 (Catalina) K. W. Wierzchosは、2019年12月17日UT、Catalina Sky サーベイ(703)によって彗星らしい 天体(PCCP C0TVEG1)として通報した。東西に伸びた8"-10"のコマがある。 彗星機能の追加報告は次の通り: OC Date Reporter Coma Tail PA Exposures H06 Dec. 18 H. Sato 12" W V11 Dec. 20 D. Rankin 12" 15x30s I52 Dec. 20 T. A. Pruyne 285 H06 Dec. 26 H. Sato 10" 15" W 10x60s Q11 Dec. 28 H. Sato 7" 13" 275 15x60s 204 Jan. 2 L. Buzzi 7" 17" 28 100x30s A71 Jan. 6 M. Jaeger 8" 20" 280 691 Jan. 6 T. H. Bressi 11" 270 6x50s A77 Jan. 8 F. Kugel 20" 30" 280 発見位置は次のとおり、 2019 UT R.A. (2000) Decl. Mag. Observer Dec. 17.53472 13 54 30.69 - 8 18 45.9 Wierzchos 17.53986 13 54 32.26 - 8 18 44.4 " 17.54500 13 54 33.97 - 8 18 43.0 18.6 " 17.55014 13 54 35.61 - 8 18 41.0 18.1 " MPCの楕円軌道要素と位置推算表は次のとおり、 Orbital elements: P/2019 Y3 (Catalina) Epoch 2019 Dec. 23.0 TT = JDT 2458840.5 T 2019 Dec. 13.46043 TT Bell q 0.9120012 (2000.0) P Q n 0.18978012 Peri. 2.26788 -0.78189486 -0.56125163 a 2.9989477 Node 139.38253 +0.56520630 -0.82186484 e 0.6958929 Incl. 24.63488 +0.26302523 +0.09764623 P 5.19 From 84 observations 2019 Dec. 17-2020 Jan. 8, mean residual 0".9. P/2019 Y3 (Catalina) Epoch 2025 Feb. 14.0 TT = JDT 2460720.5 T 2025 Mar. 4.13961 TT Bell q 0.9310057 (2000.0) P Q n 0.18809200 Peri. 2.54951 -0.78383497 -0.55860317 a 3.0168647 Node 139.30673 +0.56211448 -0.82388923 e 0.6913996 Incl. 24.58165 +0.26387506 +0.09575503 P 5.24 From 84 observations 2019 Dec. 17-2020 Jan. 8, mean residual 0".9. P/2019 Y3 (Catalina) Epoch 2020 May 31.0 TT = JDT 2459000.5 T 2019 Dec. 13.46418 TT Bell q 0.9121432 (2000.0) P Q n 0.18972816 Peri. 2.28265 -0.78200566 -0.56108708 a 2.9994953 Node 139.37942 +0.56503329 -0.82198307 e 0.6959011 Incl. 24.63525 +0.26306754 +0.09759671 P 5.19 From 84 observations 2019 Dec. 17-2020 Jan. 8, mean residual 0".9. Ephemeris: Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 2019 12 10 13 15 18.3 -09 11 45 0.9436 0.9135 56.5 64.0 18.0 ... 2019 12 25 14 30 56.9 -07 21 51 1.0209 0.9283 55.1 60.4 18.2 ... 2020 01 02 15 07 00.4 -06 18 59 1.0712 0.9575 55.4 57.7 18.5 ... 2020 01 08 15 31 56.5 -05 31 17 1.1105 0.9879 55.9 55.5 18.7 2020 01 09 15 35 55.3 -05 23 18 1.1171 0.9936 56.0 55.2 18.7 2020 01 10 15 39 51.1 -05 15 19 1.1237 0.9995 56.2 54.8 18.8 ... 2020 01 16 16 02 24.3 -04 27 07 1.1628 1.0379 57.1 52.7 19.0 ... 2020 01 24 16 29 48.0 -03 21 41 1.2125 1.0965 58.8 50.2 19.3 ... 2020 02 08 17 13 23.7 -01 13 11 1.2932 1.2224 63.2 46.1 19. (MPEC 2020-A109、CBET 4711)