IOTA/IOTA-ES occultation update for (385) Ilmatar / UCAC4-637-019893 event on 2023 Feb 23, 16:20 UT Visible from Russia, China Summary ------- On 2023 Feb 23 UT, the 82.1 km diameter asteroid (385) Ilmatar will occult a 12.3 mag star in the constellation Auriga for observers along a path across Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.96 mag to 12.70 mag (the magnitude of the asteroid) for at most 6.680 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2023 Feb 23, 16:12 - 2023 Feb 23, 16:28 * geocentric midpoint of event [JD]: 2459999.18110321 * magnitude of target star: 12.31 * magnitude drop [mag]: 0.96 * estimated maximum duration [s]: 6.680 * Moon: 15 % sunlit, 58° distance * Sun: 101° distance * rough path description: Russia, China The occultation path -------------------- * approximate projected width [km]: 91 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 82°) * approx speed of asteroid's shadow [km/s]: 12.2921 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-637-019893 by 385 Ilmatar on 2023 Feb 23 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 94 0 0 41 10 47 16 12 58.6 0 37 30 .. .. .. 41 52 23 .. .. .. 42 11 27 .... - 93 0 0 42 10 54 16 12 58.9 1 38 30 41 29 46 42 52 27 41 11 10 43 11 30 -0.44 - 92 0 0 43 9 58 16 12 59.3 3 38 30 42 28 54 43 51 26 42 10 20 44 10 27 -0.46 - 91 0 0 44 7 56 16 13 0.1 4 39 29 43 26 58 44 49 17 43 8 26 45 8 15 -0.48 - 90 0 0 45 4 44 16 13 1.0 5 40 29 44 23 53 45 45 58 44 5 25 46 4 52 -0.48 - 89 0 0 46 0 21 16 13 2.2 6 40 29 45 19 39 46 41 26 45 1 15 47 0 16 -0.48 - 88 0 0 46 54 44 16 13 3.6 7 41 28 46 14 12 47 35 39 45 55 52 47 54 24 -0.49 - 87 0 0 47 47 53 16 13 5.2 8 42 28 47 7 32 48 28 36 46 49 17 48 47 16 -0.49 - 86 0 0 48 39 45 16 13 6.9 10 43 27 47 59 36 49 20 16 47 41 27 49 38 49 -0.49 - 85 0 0 49 30 20 16 13 8.8 11 43 27 48 50 25 50 10 37 48 32 21 50 29 4 -0.49 - 84 0 0 50 19 37 16 13 10.9 12 44 26 49 39 56 50 59 39 49 21 59 51 18 0 -0.49 - 83 0 0 51 7 36 16 13 13.1 13 45 26 50 28 10 51 47 22 50 10 20 52 5 35 -0.49 - 82 0 0 51 54 17 16 13 15.4 14 46 26 51 15 7 52 33 46 50 57 24 52 51 52 -0.49 - 81 0 0 52 39 39 16 13 17.8 15 47 25 52 0 46 53 18 51 51 43 11 53 36 49 -0.49 - 80 0 0 53 23 43 16 13 20.4 16 48 25 52 45 8 54 2 38 52 27 41 54 20 26 -0.49 - 79 0 0 54 6 30 16 13 23.0 17 48 24 53 28 13 54 45 6 53 10 54 55 2 46 -0.49 - 78 0 0 54 48 1 16 13 25.7 17 49 24 54 10 3 55 26 17 53 52 52 55 43 49 -0.49 - 77 0 0 55 28 16 16 13 28.4 18 50 23 54 50 37 56 6 12 54 33 34 56 23 35 -0.49 - 76 0 0 56 7 16 16 13 31.2 19 51 23 55 29 57 56 44 53 55 13 3 57 2 6 -0.49 - 75 0 0 56 45 3 16 13 34.1 20 52 22 56 8 3 57 22 19 55 51 19 57 39 23 -0.49 - 74 0 0 57 21 38 16 13 37.0 21 53 22 56 44 59 57 58 34 56 28 23 58 15 28 -0.49 - 73 0 0 57 57 3 16 13 39.9 22 54 22 57 20 43 58 33 38 57 4 17 58 50 22 -0.49 - 72 0 0 58 31 18 16 13 42.8 22 55 21 57 55 19 59 7 32 57 39 2 59 24 7 -0.49 - 71 0 0 59 4 26 16 13 45.8 23 56 21 58 28 48 59 40 19 58 12 39 59 56 45 -0.49 - 70 0 0 59 36 28 16 13 48.8 24 57 20 59 1 10 60 12 1 58 45 11 60 28 16 -0.49 - 69 0 0 60 7 26 16 13 51.8 25 57 20 59 32 29 60 42 38 59 16 38 60 58 44 -0.49 - 68 0 0 60 37 22 16 13 54.8 25 58 19 60 2 44 61 12 12 59 47 3 61 28 9 -0.49 - 67 0 0 61 6 16 16 13 57.8 26 59 19 60 31 59 61 40 46 60 16 27 61 56 33 -0.49 - 66 0 0 61 34 12 16 14 0.8 27 60 19 61 0 15 62 8 21 60 44 51 62 23 58 -0.49 - 65 0 0 62 1 9 16 14 3.8 27 61 18 61 27 32 62 34 59 61 12 18 62 50 27 -0.49 - 64 0 0 62 27 11 16 14 6.8 28 62 18 61 53 54 63 0 41 61 38 48 63 15 59 -0.49 - 63 0 0 62 52 19 16 14 9.8 28 63 17 62 19 21 63 25 29 62 4 24 63 40 38 -0.48 - 62 0 0 63 16 34 16 14 12.7 29 64 17 62 43 55 63 49 25 62 29 7 64 4 25 -0.48 - 61 0 0 63 39 59 16 14 15.7 30 65 17 63 7 39 64 12 30 62 52 59 64 27 22 -0.48 - 60 0 0 64 2 34 16 14 18.6 30 66 16 63 30 32 64 34 46 63 16 1 64 49 29 -0.48 - 59 0 0 64 24 21 16 14 21.5 31 67 16 63 52 38 64 56 15 63 38 15 65 10 49 -0.48 - 58 0 0 64 45 22 16 14 24.4 31 68 16 64 13 56 65 16 58 63 59 41 65 31 24 -0.48 - 57 0 0 65 5 38 16 14 27.3 32 69 15 64 34 30 65 36 56 64 20 23 65 51 14 -0.48 - 56 0 0 65 25 10 16 14 30.2 32 70 15 64 54 19 65 56 11 64 40 20 66 10 21 -0.48 - 55 0 0 65 44 1 16 14 33.0 33 71 15 65 13 26 66 14 44 64 59 34 66 28 47 -0.48 - 54 0 0 66 2 10 16 14 35.8 33 72 14 65 31 52 66 32 37 65 18 8 66 46 32 -0.48 - 53 0 0 66 19 40 16 14 38.6 34 73 14 65 49 38 66 49 51 65 36 1 67 3 38 -0.48 - 52 0 0 66 36 32 16 14 41.4 34 74 13 66 6 46 67 6 27 65 53 15 67 20 7 -0.48 - 51 0 0 66 52 47 16 14 44.1 35 75 13 66 23 16 67 22 27 66 9 52 67 35 59 -0.48 - 50 0 0 67 8 26 16 14 46.9 35 76 13 66 39 9 67 37 50 66 25 52 67 51 16 -0.48 - 49 0 0 67 23 30 16 14 49.6 36 78 13 66 54 28 67 52 40 66 41 17 68 5 59 -0.48 - 48 0 0 67 38 0 16 14 52.3 36 79 12 67 9 12 68 6 56 66 56 8 68 20 9 -0.48 - 47 0 0 67 51 58 16 14 54.9 36 80 12 67 23 23 68 20 40 67 10 25 68 33 46 -0.48 - 46 0 0 68 5 23 16 14 57.6 37 81 12 67 37 2 68 33 52 67 24 10 68 46 52 -0.48 - 45 0 0 68 18 18 16 15 0.2 37 82 11 67 50 10 68 46 34 67 37 24 68 59 28 -0.48 - 44 0 0 68 30 43 16 15 2.8 38 83 11 68 2 47 68 58 47 67 50 7 69 11 35 -0.48 - 43 0 0 68 42 40 16 15 5.4 38 84 11 68 14 55 69 10 31 68 2 20 69 23 13 -0.48 - 42 0 0 68 54 7 16 15 8.0 38 85 10 68 26 35 69 21 47 68 14 5 69 34 24 -0.48 - 41 0 0 69 5 8 16 15 10.5 39 86 10 68 37 46 69 32 36 68 25 22 69 45 8 -0.48 - 40 0 0 69 15 41 16 15 13.1 39 87 10 68 48 31 69 42 58 68 36 11 69 55 25 -0.48 - 39 0 0 69 25 49 16 15 15.6 39 88 10 68 58 49 69 52 55 68 46 34 70 5 18 -0.48 - 38 0 0 69 35 32 16 15 18.1 40 89 9 69 8 42 70 2 28 68 56 31 70 14 45 -0.48 - 37 0 0 69 44 49 16 15 20.6 40 90 9 69 18 9 70 11 36 69 6 3 70 23 49 -0.48 - 36 0 0 69 53 43 16 15 23.0 41 91 9 69 27 13 70 20 20 69 15 11 70 32 29 -0.48 - 35 0 0 70 2 14 16 15 25.5 41 92 8 69 35 52 70 28 41 69 23 54 70 40 46 -0.48 - 34 0 0 70 10 22 16 15 27.9 41 93 8 69 44 9 70 36 40 69 32 15 70 48 41 -0.48 - 33 0 0 70 18 7 16 15 30.4 42 95 8 69 52 2 70 44 17 69 40 12 70 56 14 -0.48 - 32 0 0 70 25 30 16 15 32.8 42 96 8 69 59 34 70 51 33 69 47 47 71 3 26 -0.48 - 31 0 0 70 32 33 16 15 35.2 42 97 7 70 6 44 70 58 28 69 55 0 71 10 17 -0.48 - 30 0 0 70 39 14 16 15 37.6 43 98 7 70 13 32 71 5 2 70 1 52 71 16 48 -0.48 - 29 0 0 70 45 35 16 15 40.0 43 99 7 70 20 0 71 11 16 70 8 24 71 22 59 -0.48 - 28 0 0 70 51 36 16 15 42.4 43 100 7 70 26 8 71 17 10 70 14 34 71 28 50 -0.48 - 27 0 0 70 57 18 16 15 44.8 43 101 6 70 31 56 71 22 45 70 20 25 71 34 22 -0.48 - 26 0 0 71 2 40 16 15 47.1 44 102 6 70 37 24 71 28 1 70 25 55 71 39 36 -0.48 - 25 0 0 71 7 43 16 15 49.5 44 103 6 70 42 33 71 32 59 70 31 7 71 44 31 -0.48 - 24 0 0 71 12 28 16 15 51.9 44 104 5 70 47 23 71 37 38 70 35 59 71 49 8 -0.48 - 23 0 0 71 16 54 16 15 54.2 45 106 5 70 51 54 71 42 0 70 40 33 71 53 27 -0.48 - 22 0 0 71 21 3 16 15 56.6 45 107 5 70 56 7 71 46 3 70 44 48 71 57 28 -0.48 - 21 0 0 71 24 53 16 15 58.9 45 108 5 71 0 2 71 49 50 70 48 44 72 1 13 -0.48 - 20 0 0 71 28 26 16 16 1.2 46 109 4 71 3 39 71 53 19 70 52 23 72 4 40 -0.47 - 19 0 0 71 31 42 16 16 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44 58 32 47 -0.48 59 0 0 57 2 17 16 20 53.0 64 230 -25 56 25 16 57 39 34 56 8 30 57 56 37 -0.48 60 0 0 56 24 19 16 21 0.7 64 232 -25 55 46 56 57 1 58 55 30 0 57 19 12 -0.48 61 0 0 55 45 2 16 21 8.6 64 235 -26 55 7 18 56 23 4 54 50 13 56 40 28 -0.48 62 0 0 55 4 26 16 21 16.7 64 238 -27 54 26 20 55 42 50 54 9 5 56 0 24 -0.48 63 0 0 54 22 29 16 21 25.1 64 240 -28 53 44 2 55 1 14 53 26 37 55 18 58 -0.48 64 0 0 53 39 9 16 21 33.6 64 243 -29 53 0 21 54 18 15 52 42 47 54 36 10 -0.48 65 0 0 52 54 25 16 21 42.3 64 246 -30 52 15 16 53 33 52 51 57 33 53 51 56 -0.48 66 0 0 52 8 15 16 21 51.3 63 249 -30 51 28 47 52 48 3 51 10 55 53 6 16 -0.48 67 0 0 51 20 40 16 22 0.4 63 251 -31 50 40 52 52 0 47 50 22 52 52 19 9 -0.48 68 0 0 50 31 38 16 22 9.8 63 254 -32 49 51 31 51 12 4 49 33 23 51 30 35 -0.48 69 0 0 49 41 8 16 22 19.4 62 257 -33 49 0 44 50 21 52 48 42 28 50 40 32 -0.48 70 0 0 48 49 11 16 22 29.1 62 259 -34 48 8 31 49 30 13 47 50 7 49 49 0 -0.48 71 0 0 47 55 48 16 22 39.1 61 262 -35 47 14 52 48 37 5 46 56 21 48 56 0 -0.48 72 0 0 47 0 57 16 22 49.2 61 265 -36 46 19 47 47 42 30 46 1 9 48 1 32 -0.48 73 0 0 46 4 42 16 22 59.5 60 267 -38 45 23 17 46 46 28 45 4 34 47 5 36 -0.48 74 0 0 45 7 1 16 23 9.9 59 270 -39 44 25 25 45 49 0 44 6 36 46 8 14 -0.48 75 0 0 44 7 59 16 23 20.5 59 272 -40 43 26 12 44 50 9 43 7 18 45 9 28 -0.48 76 0 0 43 7 35 16 23 31.3 58 274 -41 42 25 39 43 49 55 42 6 41 44 9 19 -0.49 77 0 0 42 5 54 16 23 42.1 57 276 -42 41 23 50 42 48 22 41 4 49 43 7 49 -0.49 78 0 0 41 2 58 16 23 53.1 56 278 -43 40 20 48 41 45 32 40 1 44 42 5 3 -0.49 79 0 0 39 58 51 16 24 4.1 55 281 -45 39 16 37 40 41 30 38 57 31 41 1 2 -0.49 80 0 0 38 53 36 16 24 15.1 54 282 -46 38 11 19 39 36 18 37 52 12 39 55 52 -0.49 81 0 0 37 47 18 16 24 26.2 53 284 -47 37 4 59 38 30 1 36 45 52 38 49 36 -0.49 82 0 0 36 40 1 16 24 37.3 52 286 -48 35 57 43 37 22 43 35 38 35 37 42 18 -0.49 83 0 0 35 31 50 16 24 48.4 51 288 -50 34 49 34 36 14 30 34 30 28 36 34 4 -0.49 84 0 0 34 22 51 16 24 59.5 50 289 -51 33 40 39 35 5 27 33 21 35 35 24 59 -0.49 85 0 0 33 13 9 16 25 10.4 48 291 -52 32 31 3 33 55 39 32 12 1 34 15 8 -0.50 86 0 0 32 2 50 16 25 21.3 47 292 -54 31 20 51 32 45 13 31 1 53 33 4 39 -0.50 87 0 0 30 52 0 16 25 32.1 46 294 -55 30 10 10 31 34 14 29 51 16 31 53 36 -0.50 88 0 0 29 40 46 16 25 42.7 45 295 -56 28 59 6 30 22 49 28 40 16 30 42 6 -0.50 89 0 0 28 29 12 16 25 53.1 43 296 -58 27 47 45 29 11 4 27 29 0 29 30 15 -0.50 90 0 0 27 17 27 16 26 3.3 42 297 -59 26 36 13 27 59 4 26 17 34 28 18 9 -0.50 91 0 0 26 5 35 16 26 13.4 41 298 -61 25 24 35 26 46 58 25 6 3 27 5 56 -0.50 92 0 0 24 53 43 16 26 23.1 39 299 -62 24 12 59 25 34 50 23 54 34 25 53 41 -0.50 93 0 0 23 41 58 16 26 32.6 38 300 -63 23 1 30 24 22 47 22 43 12 24 41 30 -0.51 94 0 0 22 30 24 16 26 41.8 36 301 -65 21 50 14 23 10 56 21 32 4 23 29 30 -0.51 95 0 0 21 19 7 16 26 50.7 35 301 -66 20 39 16 21 59 20 20 21 15 22 17 46 -0.51 96 0 0 20 8 14 16 26 59.3 33 302 -68 19 28 42 20 48 7 19 10 49 21 6 23 -0.51 97 0 0 18 57 49 16 27 7.6 32 303 -69 18 18 37 19 37 21 18 0 53 19 55 28 -0.51 98 0 0 17 47 57 16 27 15.5 31 303 -70 17 9 6 18 27 9 16 51 32 18 45 6 -0.51 99 0 0 16 38 44 16 27 23.0 29 304 -72 16 0 13 17 17 33 15 42 48 17 35 20 -0.51 100 0 0 15 30 12 16 27 30.2 28 304 -73 14 52 3 16 8 40 14 34 48 16 26 17 -0.52 101 0 0 14 22 27 16 27 37.0 26 305 -74 13 44 40 15 0 32 13 27 34 15 17 59 -0.52 102 0 0 13 15 31 16 27 43.5 25 305 -75 12 38 6 13 53 14 12 21 10 14 10 30 -0.52 103 0 0 12 9 29 16 27 49.5 23 306 -77 11 32 26 12 46 49 11 15 40 13 3 55 -0.52 104 0 0 11 4 23 16 27 55.2 22 306 -78 10 27 43 11 41 21 10 11 7 11 58 16 -0.52 105 0 0 10 0 16 16 28 0.5 20 306 -79 9 23 58 10 36 51 9 7 32 10 53 36 -0.52 106 0 0 8 57 11 16 28 5.4 19 306 -80 8 21 15 9 33 23 8 4 59 9 49 57 -0.53 107 0 0 7 55 9 16 28 9.9 18 307 -81 7 19 36 8 30 59 7 3 29 8 47 23 -0.53 108 0 0 6 54 13 16 28 14.1 16 307 -81 6 19 1 7 29 41 6 3 5 7 45 54 -0.53 109 0 0 5 54 25 16 28 17.8 15 307 -82 5 19 34 6 29 30 5 3 48 6 45 33 -0.54 110 0 0 4 55 44 16 28 21.2 13 307 -82 4 21 16 5 30 27 4 5 39 5 46 20 -0.54 111 0 0 3 58 13 16 28 24.3 12 307 -82 3 24 6 4 32 35 3 8 39 4 48 18 -0.54 112 0 0 3 1 53 16 28 27.0 11 307 -82 2 28 7 3 35 53 2 12 49 3 51 27 -0.55 113 0 0 2 6 45 16 28 29.3 9 307 -82 1 33 19 2 40 24 1 18 10 2 55 47 -0.56 114 0 0 1 12 47 16 28 31.4 8 307 -81 0 39 42 1 46 6 0 24 42 2 1 20 -0.56 115 0 0 0 20 3 16 28 33.0 7 308 -81 - 0 12 43 0 53 1 - 0 27 34 1 8 5 -0.58 116 0 0 - 0 31 30 16 28 34.4 5 308 -80 - 1 3 56 0 1 9 - 1 18 38 0 16 4 -0.60 117 0 0 - 1 21 50 16 28 35.4 4 308 -79 - 1 53 57 - 0 49 31 - 2 8 31 - 0 34 44 -0.63 118 0 0 - 2 10 57 16 28 36.2 3 307 -78 - 2 42 46 - 1 38 57 - 2 57 11 - 1 24 20 -0.69 119 0 0 - 2 58 53 16 28 36.6 1 307 -77 - 3 30 24 - 2 27 12 - 3 44 40 - 2 12 42 -0.86 120 0 0 - 3 45 37 16 28 36.8 0 307 -76 .. .. .. - 3 14 13 .. .. .. - 2 59 53 -4.34 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-637-019893 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 52 19.0028 DE: +37 13 46.005 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 52 19.0027 DE: +37 13 46.005 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (385) Ilmatar asteroid class: approx. diameter [km]: 82 approx. diameter ["]: 0.048 distance from Earth [AU]: 2.35190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 date of fit: 2023 Feb 07 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.018", 0.002", 82.304° remarks: * orbital elements for (385)Ilmatar : Mean anomaly = 296.6850599565 deg Arg. of pericenter = 189.1718168472 deg Long. of node = 344.8544721083 deg Inclination = 13.5827664356 deg Eccentricity = 0.1261763119 Semimajor axis = 2.8464781651 AU Perihelion dist = 2.4873200482 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 59998.68118055 TDT (2023 Feb 23.6812) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Feb07,6.68,2023,2,23,16.346477,0.212743,0.368720,6.008997,-3.468102,0.005762,0.000384,0.000000,0.000000 34.9705,37.2699,-61.86,-9.76,False UCAC4-637-019893,4.87194524,37.2294458,0.00,12.31,0.00,0.0,0,,4.89782403,37.2698595,0.97,0.00,0,0,0 385,Ilmatar,12.70,82.1,2.3519,0,0,1.883,-12.97,,3.6,0 0,296.5453,2023,2,23,189.1718,344.8545,13.5828,0.12618,2.84648,2.48732,7.64,5.0,0.15 1.228,0.0177,0.0023,82,0.0110,Known errors,-1.00,-1,-1,-1 20230223_019893,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org