Pre-2020 May 8 Astrometry: CK19Y040 KC2020 04 13.85790 06 33 03.43 +66 20 00.4 18.0 R J77 CK19Y040 KC2020 04 13.86707 06 33 00.33 +66 19 50.9 17.9 R J77 CK19Y040 KC2020 04 13.87626 06 32 57.43 +66 19 41.9 17.8 R J77 CK19Y040 KC2020 04 14.85555 06 27 48.36 +66 03 30.4 17.9 R J77 CK19Y040 KC2020 04 14.87726 06 27 41.53 +66 03 08.1 17.6 R J77 CK19Y040 KC2020 04 14.90320 06 27 33.35 +66 02 41.1 17.5 R J77 CK19Y040 KC2020 04 15.85507 06 22 41.60 +65 46 16.5 17.3 R J77 CK19Y040 KC2020 04 15.89714 06 22 28.73 +65 45 31.3 17.4 R J77 CK19Y040 KC2020 04 15.91554 06 22 23.22 +65 45 11.3 17.4 R J77 CK19Y040 KC2020 04 16.85468 06 17 42.99 +65 28 22.4 17.5 R J77 CK19Y040 KC2020 04 16.86461 06 17 39.94 +65 28 11.3 17.4 R J77 CK19Y040 KC2020 04 16.88005 06 17 35.47 +65 27 54.0 17.6 R J77 CK19Y040 KC2020 04 23.87155 05 46 05.10 +63 05 01.0 16.8 R J77 CK19Y040 KC2020 04 23.88258 05 46 02.39 +63 04 46.5 16.8 R J77 CK19Y040 KC2020 04 23.89361 05 45 59.55 +63 04 30.9 16.8 R J77 CK19Y040 KC2020 04 23.90561 05 45 56.59 +63 04 14.2 16.7 R J77 CK19Y040 KC2020 04 25.89276 05 37 47.82 +62 17 54.8 16.9 R J77 CK19Y040 KC2020 04 25.94233 05 37 35.83 +62 16 41.9 17.1 R J77 CK19Y040 KC2020 04 25.94766 05 37 34.48 +62 16 34.2 17.0 R J77 CK19Y040 KC2020 04 25.95352 05 37 33.12 +62 16 25.9 16.9 R J77 CK19Y040 KC2020 05 06.88790 04 54 58.04 +56 54 26.6 16.5 R J77 CK19Y040 KC2020 05 06.90004 04 54 55.22 +56 53 59.3 16.3 R J77 CK19Y040 KC2020 05 06.91759 04 54 51.14 +56 53 19.9 16.1 R J77 Station data: (J77) Golden Hill Observatory, Stourton Caundle (N50.930949 W2.405300) UK. Observer R. Miles. 0.35-m f/8 Schmidt-Cassegrain + CCD. Orbital elements: C/2019 Y4 Perihelion 2020 May 31.02822 +/- 0.00351 TT = 0:40:37 (JD 2459000.52822) Epoch 2020 May 6.0 TT = JDT 2458975.5 Earth MOID: 0.6314 Auto-Find M 359.99443543 +/- 0.0035 (J2000 ecliptic) n 0.00022233 +/- 0.000115 Peri. 177.40732 +/- 0.012 a 269.858062 +/- 94.6 Node 120.62684 +/- 0.006 e 0.9990639 +/- 0.000324 Incl. 45.42653 +/- 0.012 P4433.05 U 6.7 q 0.25260240 +/- 2.44e-5 Q 539.463522 +/- 89.3 From 23 observations 2020 Apr. 13-May 6; mean residual 0".43 Residuals in arcseconds: 200413 J77 .35- .06+ 200415 J77 1.1+ .35+ 200425 J77 .19+ .47- 200413 J77 1.1- .30- 200416 J77 .78+ .05+ 200425 J77 .02+ .34- 200413 J77 .70- .13- 200416 J77 .20+ .09+ 200425 J77 .46- .19- 200414 J77 .40- .04+ 200416 J77 .93+ .14+ 200425 J77 .12- .15+ 200414 J77 .41- .33+ 200423 J77 .10- .64- 200506 J77 .17- .04+ 200414 J77 .69- .41+ 200423 J77 .31+ .19+ 200506 J77 .06- .10+ 200415 J77 .76+ .05- 200423 J77 .18- .08- 200506 J77 .01+ .27+ 200415 J77 .62+ .34+ 200423 J77 .12+ .09- --------------------------------------------------------------------------------- Post-2020 May 8 Astrometry: CK19Y040 KC2020 05 11.94893 04 34 40.23 +53 16 41.8 15.6 R J77 CK19Y040 KC2020 05 11.96731 04 34 35.74 +53 15 46.0 15.3 R J77 CK19Y040 KC2020 05 11.98612 04 34 31.18 +53 14 49.3 14.9 R J77 CK19Y040 KC2020 05 12.00561 04 34 26.45 +53 13 50.1 15.0 R J77 CK19Y040 KC2020 05 13.91364 04 26 29.87 +51 30 59.5 15.8 R J77 CK19Y040 KC2020 05 13.93936 04 26 23.46 +51 29 30.3 15.6 R J77 CK19Y040 KC2020 05 13.96528 04 26 17.05 +51 28 00.2 15.6 R J77 CK19Y040 KC2020 05 13.99118 04 26 10.67 +51 26 30.2 14.6 R J77 CK19Y040 KC2020 05 14.88972 04 22 23.02 +50 32 39.8 15.2 R J77 CK19Y040 KC2020 05 14.90903 04 22 18.21 +50 31 28.1 15.3 R J77 CK19Y040 KC2020 05 14.92300 04 22 14.69 +50 30 35.6 15.2 R J77 CK19Y040 KC2020 05 14.93954 04 22 10.57 +50 29 33.9 15.2 R J77 CK19Y040 KC2020 05 15.91914 04 18 01.28 +49 26 20.7 15.8 R J77 CK19Y040 KC2020 05 15.93886 04 17 56.33 +49 25 03.1 15.7 R J77 CK19Y040 KC2020 05 15.95725 04 17 51.74 +49 23 49.7 15.8 R J77 Station data: (J77) Golden Hill Observatory, Stourton Caundle (N50.930949 W2.405300) UK. Observer R. Miles. 0.35-m f/8 Schmidt-Cassegrain + CCD.Orbital elements: C/2019 Y4 Perihelion 2020 May 31.01833 +/- 0.136 TT = 0:26:23 (JD 2459000.51833) Epoch 2020 May 15.0 TT = JDT 2458984.5 Earth MOID: 0.6320 Auto-Find M 359.98811822 +/- 0.17 (J2000 ecliptic) n 0.00074176 +/- Peri. 177.43337 +/- 0.47 a 120.862949 +/- Node 121.59893 +/- 0.16 e 0.9979470 +/- 0.0114 Incl. 45.87248 +/- 0.6 P1328.74 U 9.3 q 0.24812648 +/- 0.0022 Q 241.477772 +/- 242 From 15 observations 2020 May 11-15; mean residual 0".64 Residuals in arcseconds: 200511 J77 .14- .21- 200513 J77 .26+ .35+ 200514 J77 .28- .91- 200511 J77 .27- .21- 200513 J77 .48+ .61+ 200514 J77 .09- .61- 200511 J77 .12- .22+ 200513 J77 .85+ .95+ 200515 J77 .29- 1.3- 200512 J77 .05- .21+ 200514 J77 .42- 1.3- 200515 J77 .18- .81+ 200513 J77 .42+ .05- 200514 J77 .09- .75- 200515 J77 .12+ 1.8+ --------------------------------------------------------------------------------- Pre- and post-2020 May 08 Astrometry: CK19Y040 KC2020 04 13.85790 06 33 03.43 +66 20 00.4 18.0 R J77 CK19Y040 KC2020 04 13.86707 06 33 00.33 +66 19 50.9 17.9 R J77 CK19Y040 KC2020 04 13.87626 06 32 57.43 +66 19 41.9 17.8 R J77 CK19Y040 KC2020 04 14.85555 06 27 48.36 +66 03 30.4 17.9 R J77 CK19Y040 KC2020 04 14.87726 06 27 41.53 +66 03 08.1 17.6 R J77 CK19Y040 KC2020 04 14.90320 06 27 33.35 +66 02 41.1 17.5 R J77 CK19Y040 KC2020 04 15.85507 06 22 41.60 +65 46 16.5 17.3 R J77 CK19Y040 KC2020 04 15.89714 06 22 28.73 +65 45 31.3 17.4 R J77 CK19Y040 KC2020 04 15.91554 06 22 23.22 +65 45 11.3 17.4 R J77 CK19Y040 KC2020 04 16.85468 06 17 42.99 +65 28 22.4 17.5 R J77 CK19Y040 KC2020 04 16.86461 06 17 39.94 +65 28 11.3 17.4 R J77 CK19Y040 KC2020 04 16.88005 06 17 35.47 +65 27 54.0 17.6 R J77 CK19Y040 KC2020 04 23.87155 05 46 05.10 +63 05 01.0 16.8 R J77 CK19Y040 KC2020 04 23.88258 05 46 02.39 +63 04 46.5 16.8 R J77 CK19Y040 KC2020 04 23.89361 05 45 59.55 +63 04 30.9 16.8 R J77 CK19Y040 KC2020 04 23.90561 05 45 56.59 +63 04 14.2 16.7 R J77 CK19Y040 KC2020 04 25.89276 05 37 47.82 +62 17 54.8 16.9 R J77 CK19Y040 KC2020 04 25.94233 05 37 35.83 +62 16 41.9 17.1 R J77 CK19Y040 KC2020 04 25.94766 05 37 34.48 +62 16 34.2 17.0 R J77 CK19Y040 KC2020 04 25.95352 05 37 33.12 +62 16 25.9 16.9 R J77 CK19Y040 KC2020 05 06.88790 04 54 58.04 +56 54 26.6 16.5 R J77 CK19Y040 KC2020 05 06.90004 04 54 55.22 +56 53 59.3 16.3 R J77 CK19Y040 KC2020 05 06.91759 04 54 51.14 +56 53 19.9 16.1 R J77 CK19Y040 KC2020 05 11.94893 04 34 40.23 +53 16 41.8 15.6 R J77 CK19Y040 KC2020 05 11.96731 04 34 35.74 +53 15 46.0 15.3 R J77 CK19Y040 KC2020 05 11.98612 04 34 31.18 +53 14 49.3 14.9 R J77 CK19Y040 KC2020 05 12.00561 04 34 26.45 +53 13 50.1 15.0 R J77 CK19Y040 KC2020 05 13.91364 04 26 29.87 +51 30 59.5 15.8 R J77 CK19Y040 KC2020 05 13.93936 04 26 23.46 +51 29 30.3 15.6 R J77 CK19Y040 KC2020 05 13.96528 04 26 17.05 +51 28 00.2 15.6 R J77 CK19Y040 KC2020 05 13.99118 04 26 10.67 +51 26 30.2 14.6 R J77 CK19Y040 KC2020 05 14.88972 04 22 23.02 +50 32 39.8 15.2 R J77 CK19Y040 KC2020 05 14.90903 04 22 18.21 +50 31 28.1 15.3 R J77 CK19Y040 KC2020 05 14.92300 04 22 14.69 +50 30 35.6 15.2 R J77 CK19Y040 KC2020 05 14.93954 04 22 10.57 +50 29 33.9 15.2 R J77 CK19Y040 KC2020 05 15.91914 04 18 01.28 +49 26 20.7 15.8 R J77 CK19Y040 KC2020 05 15.93886 04 17 56.33 +49 25 03.1 15.7 R J77 CK19Y040 KC2020 05 15.95725 04 17 51.74 +49 23 49.7 15.8 R J77 Station data: (J77) Golden Hill Observatory, Stourton Caundle (N50.930949 W2.405300) UK. Observer R. Miles. 0.35-m f/8 Schmidt-Cassegrain + CCD. Orbital elements: C/2019 Y4 Perihelion 2020 May 31.04344 +/- 0.00975 TT = 1:02:33 (JD 2459000.54344) Epoch 2020 May 15.0 TT = JDT 2458984.5 Earth MOID: 0.6310 Auto-Find M 359.98691013 +/- 0.008 (J2000 ecliptic) n 0.00081590 +/- 0.000491 Peri. 177.44980 +/- 0.036 a 113.425537 +/- 45.4 Node 120.71205 +/- 0.019 e 0.9977750 +/- 0.000892 Incl. 45.42483 +/- 0.033 P1208.00 U 7.6 q 0.25237144 +/- 4.31e-5 Q 226.598703 +/- 67.6 From 38 observations 2020 Apr. 13-May 15; mean residual 2".31 Residuals in arcseconds: 200413 J77 2.4- 1.3- 200423 J77 2.4+ 2.3+ 200512 J77 2.0- 3.1- 200413 J77 3.2- 1.7- 200423 J77 1.9+ 2.0+ 200513 J77 1.5- 3.1- 200413 J77 2.8- 1.5- 200423 J77 2.3+ 2.0+ 200513 J77 1.7- 2.7- 200414 J77 1.7- .83- 200425 J77 2.4+ 1.8+ 200513 J77 1.4- 2.4- 200414 J77 1.7- .53- 200425 J77 2.2+ 1.9+ 200513 J77 1.0- 2.0- 200414 J77 1.9- .44- 200425 J77 1.7+ 2.1+ 200514 J77 .44- 1.1- 200415 J77 .19+ .44- 200425 J77 2.0+ 2.4+ 200514 J77 .06- .40- 200415 J77 .08+ .03- 200506 J77 1.1- 2.0- 200514 J77 .21- .49- 200415 J77 .62+ .01- 200506 J77 1.0- 1.9- 200514 J77 .02+ .11- 200416 J77 .83+ .12+ 200506 J77 .94- 1.8- 200515 J77 3.0+ 5.1+ 200416 J77 .25+ .16+ 200511 J77 2.0- 3.4- 200515 J77 3.2+ 7.3+ 200416 J77 1.0+ .21+ 200511 J77 2.1- 3.4- 200515 J77 3.6+ 8.5+ 200423 J77 2.0+ 1.5+ 200511 J77 2.0- 3.0-