IOTA/IOTA-ES occultation update for (304) Olga / UCAC4 447-003977 event on 2023 Sep 15, 10:39 UT Visible from E Canada, E USA Summary ------- On 2023 Sep 15 UT, the 68.9 km diameter asteroid (304) Olga will occult a 12.3 mag star in the constellation Cetus for observers along a path across E Canada, E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.12 mag to 12.96 mag (the magnitude of the asteroid) for at most 8.140 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: 100 * date and approx. time of event: 2023 Sep 15, 10:28 - 2023 Sep 15, 10:49 * geocentric midpoint of event [JD]: 2460202.94369813 * magnitude of target star: 12.32 * magnitude drop [mag]: 1.12 * estimated maximum duration [s]: 8.140 * Moon: 0 % sunlit, 132° distance * Sun: 127° distance * rough path description: E Canada, E USA The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 0.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.001", 78°) * approx speed of asteroid's shadow [km/s]: 8.4616 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 447-003977 by 304 Olga on 2023 Sep 15 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 ' " Longitude Longitude Longitude Longitude - 30 48 57 76 0 0 10 28 24.5 3 255 11 - 35 13 42 - 24 33 21 - 35 51 26 - 23 5 27 .... - 40 15 21 75 0 0 10 28 27.6 6 245 10 - 43 5 6 - 37 5 13 - 43 31 7 - 36 31 54 0.51 - 46 17 51 74 0 0 10 28 31.1 8 240 9 - 48 31 5 - 43 55 22 - 48 51 56 - 43 31 15 0.56 - 50 49 3 73 0 0 10 28 34.8 9 235 8 - 52 41 25 - 48 51 14 - 52 59 10 - 48 31 35 0.58 - 54 25 0 72 0 0 10 28 38.8 11 232 7 - 56 3 24 - 52 42 58 - 56 19 2 - 52 26 4 0.59 - 57 23 8 71 0 0 10 28 43.0 12 229 6 - 58 51 20 - 55 52 18 - 59 5 24 - 55 37 20 0.60 - 59 53 26 70 0 0 10 28 47.5 13 227 6 - 61 13 47 - 58 31 7 - 61 26 38 - 58 17 35 0.60 - 62 2 22 69 0 0 10 28 52.2 15 225 5 - 63 16 25 - 60 46 46 - 63 28 16 - 60 34 22 0.60 - 63 54 19 68 0 0 10 28 57.2 16 223 4 - 65 3 10 - 62 44 13 - 65 14 13 - 62 32 44 0.60 - 65 32 28 67 0 0 10 29 2.4 17 222 4 - 66 36 57 - 64 26 57 - 66 47 18 - 64 16 14 0.60 - 66 59 10 66 0 0 10 29 7.8 18 221 3 - 67 59 54 - 65 57 34 - 68 9 39 - 65 47 30 0.61 - 68 16 15 65 0 0 10 29 13.4 19 220 3 - 69 13 44 - 67 18 1 - 69 22 58 - 67 8 30 0.61 - 69 25 7 64 0 0 10 29 19.3 20 219 2 - 70 19 45 - 68 29 50 - 70 28 33 - 68 20 49 0.61 - 70 26 56 63 0 0 10 29 25.3 21 218 2 - 71 19 2 - 69 34 15 - 71 27 26 - 69 25 40 0.61 - 71 22 37 62 0 0 10 29 31.6 22 217 1 - 72 12 28 - 70 32 15 - 72 20 29 - 70 24 3 0.61 - 72 12 55 61 0 0 10 29 38.2 23 217 1 - 73 0 44 - 71 24 38 - 73 8 26 - 71 16 46 0.60 - 72 58 28 60 0 0 10 29 44.9 24 216 0 - 73 44 27 - 72 12 4 - 73 51 52 - 72 4 31 0.60 - 73 39 49 59 0 0 10 29 51.8 25 216 0 - 74 24 8 - 72 55 7 - 74 31 17 - 72 47 50 0.60 - 74 17 24 58 0 0 10 29 59.0 26 215 0 - 75 0 12 - 73 34 15 - 75 7 6 - 73 27 14 0.60 - 74 51 36 57 0 0 10 30 6.3 27 215 -1 - 75 33 1 - 74 9 53 - 75 39 42 - 74 3 5 0.60 - 75 22 46 56 0 0 10 30 13.9 28 215 -1 - 76 2 54 - 74 42 21 - 76 9 22 - 74 35 46 0.60 - 75 51 10 55 0 0 10 30 21.7 29 215 -2 - 76 30 7 - 75 11 57 - 76 36 25 - 75 5 35 0.60 - 76 17 4 54 0 0 10 30 29.6 30 215 -2 - 76 54 55 - 75 38 58 - 77 1 2 - 75 32 46 0.60 - 76 40 40 53 0 0 10 30 37.8 31 215 -2 - 77 17 31 - 76 3 36 - 77 23 28 - 75 57 34 0.60 - 77 2 10 52 0 0 10 30 46.2 32 215 -3 - 77 38 4 - 76 26 3 - 77 43 52 - 76 20 11 0.60 - 77 21 44 51 0 0 10 30 54.7 33 215 -3 - 77 56 46 - 76 46 31 - 78 2 25 - 76 40 47 0.60 - 77 39 31 50 0 0 10 31 3.5 34 215 -3 - 78 13 43 - 77 5 8 - 78 19 15 - 76 59 32 0.60 - 77 55 39 49 0 0 10 31 12.4 35 215 -4 - 78 29 5 - 77 22 2 - 78 34 29 - 77 16 34 0.60 - 78 10 15 48 0 0 10 31 21.5 36 215 -4 - 78 42 58 - 77 37 22 - 78 48 15 - 77 32 1 0.60 - 78 23 25 47 0 0 10 31 30.8 37 215 -4 - 78 55 28 - 77 51 12 - 79 0 38 - 77 45 58 0.60 - 78 35 15 46 0 0 10 31 40.3 38 215 -4 - 79 6 40 - 78 3 41 - 79 11 44 - 77 58 33 0.60 - 78 45 50 45 0 0 10 31 49.9 39 216 -5 - 79 16 39 - 78 14 51 - 79 21 37 - 78 9 49 0.60 - 78 55 14 44 0 0 10 31 59.7 39 216 -5 - 79 25 29 - 78 24 49 - 79 30 22 - 78 19 53 0.60 - 79 3 31 43 0 0 10 32 9.7 40 216 -5 - 79 33 15 - 78 33 38 - 79 38 3 - 78 28 47 0.60 - 79 10 46 42 0 0 10 32 19.9 41 217 -5 - 79 40 0 - 78 41 23 - 79 44 44 - 78 36 37 0.60 - 79 17 1 41 0 0 10 32 30.2 42 217 -6 - 79 45 47 - 78 48 7 - 79 50 26 - 78 43 25 0.61 - 79 22 20 40 0 0 10 32 40.7 43 218 -6 - 79 50 40 - 78 53 52 - 79 55 15 - 78 49 15 0.61 - 79 26 45 39 0 0 10 32 51.3 44 218 -6 - 79 54 40 - 78 58 42 - 79 59 11 - 78 54 9 0.61 - 79 30 18 38 0 0 10 33 2.1 44 219 -6 - 79 57 50 - 79 2 39 - 80 2 17 - 78 58 10 0.61 - 79 33 2 37 0 0 10 33 13.0 45 220 -6 - 80 0 12 - 79 5 46 - 80 4 35 - 79 1 20 0.61 - 79 34 59 36 0 0 10 33 24.1 46 220 -6 - 80 1 48 - 79 8 4 - 80 6 8 - 79 3 41 0.61 - 79 36 11 35 0 0 10 33 35.3 47 221 -6 - 80 2 40 - 79 9 35 - 80 6 57 - 79 5 16 0.61 - 79 36 39 34 0 0 10 33 46.7 47 222 -7 - 80 2 50 - 79 10 21 - 80 7 4 - 79 6 5 0.61 - 79 36 24 33 0 0 10 33 58.2 48 223 -7 - 80 2 18 - 79 10 25 - 80 6 29 - 79 6 11 -0.61 - 79 35 29 32 0 0 10 34 9.8 49 223 -7 - 80 1 6 - 79 9 45 - 80 5 14 - 79 5 35 -0.61 - 79 33 53 31 0 0 10 34 21.6 49 224 -7 - 79 59 15 - 79 8 25 - 80 3 21 - 79 4 17 -0.61 - 79 31 39 30 0 0 10 34 33.5 50 225 -7 - 79 56 46 - 79 6 26 - 80 0 50 - 79 2 20 -0.61 - 79 28 47 29 0 0 10 34 45.5 51 226 -7 - 79 53 40 - 79 3 47 - 79 57 41 - 78 59 44 -0.61 - 79 25 17 28 0 0 10 34 57.6 51 227 -7 - 79 49 58 - 79 0 30 - 79 53 57 - 78 56 29 -0.61 - 79 21 11 27 0 0 10 35 9.9 52 228 -7 - 79 45 40 - 78 56 36 - 79 49 37 - 78 52 37 -0.62 - 79 16 29 26 0 0 10 35 22.2 52 229 -7 - 79 40 47 - 78 52 5 - 79 44 42 - 78 48 8 -0.62 - 79 11 12 25 0 0 10 35 34.7 53 231 -7 - 79 35 19 - 78 46 58 - 79 39 13 - 78 43 2 -0.62 - 79 5 19 24 0 0 10 35 47.3 54 232 -7 - 79 29 17 - 78 41 15 - 79 33 10 - 78 37 21 -0.62 - 78 58 52 23 0 0 10 35 59.9 54 233 -7 - 79 22 41 - 78 34 57 - 79 26 32 - 78 31 4 -0.62 - 78 51 51 22 0 0 10 36 12.7 55 234 -7 - 79 15 32 - 78 28 4 - 79 19 21 - 78 24 12 -0.62 - 78 44 15 21 0 0 10 36 25.5 55 236 -7 - 79 7 48 - 78 20 35 - 79 11 37 - 78 16 45 -0.62 - 78 36 4 20 0 0 10 36 38.5 55 237 -7 - 78 59 31 - 78 12 31 - 79 3 19 - 78 8 42 -0.62 - 78 27 20 19 0 0 10 36 51.5 56 239 -7 - 78 50 41 - 78 3 53 - 78 54 27 - 78 0 5 -0.62 - 78 18 1 18 0 0 10 37 4.6 56 240 -7 - 78 41 17 - 77 54 40 - 78 45 2 - 77 50 52 -0.63 - 78 8 8 17 0 0 10 37 17.8 56 242 -6 - 78 31 19 - 77 44 51 - 78 35 3 - 77 41 4 -0.63 - 77 57 40 16 0 0 10 37 31.0 57 243 -6 - 78 20 46 - 77 34 27 - 78 24 31 - 77 30 41 -0.63 - 77 46 37 15 0 0 10 37 44.3 57 245 -6 - 78 9 40 - 77 23 27 - 78 13 24 - 77 19 42 -0.63 - 77 34 58 14 0 0 10 37 57.7 57 246 -6 - 77 57 59 - 77 11 52 - 78 1 42 - 77 8 7 -0.63 - 77 22 44 13 0 0 10 38 11.2 57 248 -6 - 77 45 43 - 76 59 40 - 77 49 26 - 76 55 55 -0.63 - 77 9 54 12 0 0 10 38 24.7 57 250 -6 - 77 32 51 - 76 46 51 - 77 36 33 - 76 43 7 -0.63 - 76 56 27 11 0 0 10 38 38.2 57 251 -5 - 77 19 23 - 76 33 25 - 77 23 5 - 76 29 40 -0.64 - 76 42 22 10 0 0 10 38 51.8 57 253 -5 - 77 5 18 - 76 19 20 - 77 9 0 - 76 15 36 -0.64 - 76 27 39 9 0 0 10 39 5.5 57 255 -5 - 76 50 35 - 76 4 37 - 76 54 18 - 76 0 52 -0.64 - 76 12 17 8 0 0 10 39 19.2 57 256 -5 - 76 35 14 - 75 49 14 - 76 38 57 - 75 45 29 -0.64 - 75 56 15 7 0 0 10 39 32.9 57 258 -4 - 76 19 14 - 75 33 10 - 76 22 57 - 75 29 25 -0.64 - 75 39 32 6 0 0 10 39 46.6 57 260 -4 - 76 2 33 - 75 16 25 - 76 6 17 - 75 12 39 -0.64 - 75 22 7 5 0 0 10 40 0.4 57 261 -4 - 75 45 11 - 74 58 56 - 75 48 55 - 74 55 11 -0.64 - 75 3 59 4 0 0 10 40 14.2 57 263 -4 - 75 27 7 - 74 40 44 - 75 30 51 - 74 36 58 -0.65 - 74 45 6 3 0 0 10 40 28.1 57 264 -3 - 75 8 19 - 74 21 47 - 75 12 4 - 74 18 0 -0.65 - 74 25 27 2 0 0 10 40 41.9 56 266 -3 - 74 48 45 - 74 2 3 - 74 52 31 - 73 58 15 -0.65 - 74 5 1 1 0 0 10 40 55.8 56 267 -3 - 74 28 25 - 73 41 31 - 74 32 12 - 73 37 42 -0.65 - 73 43 46 0 0 0 10 41 9.6 55 269 -2 - 74 7 17 - 73 20 9 - 74 11 4 - 73 16 18 -0.65 - 73 21 40 - 1 0 0 10 41 23.5 55 270 -2 - 73 45 18 - 72 57 55 - 73 49 7 - 72 54 3 -0.65 - 72 58 42 - 2 0 0 10 41 37.4 55 272 -2 - 73 22 28 - 72 34 48 - 73 26 19 - 72 30 55 -0.66 - 72 34 49 - 3 0 0 10 41 51.2 54 273 -1 - 72 58 44 - 72 10 45 - 73 2 36 - 72 6 50 -0.66 - 72 9 58 - 4 0 0 10 42 5.1 54 274 -1 - 72 34 4 - 71 45 44 - 72 37 58 - 71 41 48 -0.66 - 71 44 8 - 5 0 0 10 42 18.9 53 276 0 - 72 8 26 - 71 19 43 - 72 12 21 - 71 15 45 -0.66 - 71 17 17 - 6 0 0 10 42 32.7 52 277 0 - 71 41 46 - 70 52 38 - 71 45 43 - 70 48 38 -0.66 - 70 49 20 - 7 0 0 10 42 46.5 52 278 1 - 71 14 3 - 70 24 28 - 71 18 2 - 70 20 26 -0.66 - 70 20 15 - 8 0 0 10 43 0.3 51 279 1 - 70 45 13 - 69 55 9 - 70 49 15 - 69 51 4 -0.66 - 69 50 0 - 9 0 0 10 43 14.1 50 280 2 - 70 15 13 - 69 24 36 - 70 19 17 - 69 20 29 -0.67 - 69 18 29 -10 0 0 10 43 27.8 50 281 2 - 69 43 59 - 68 52 48 - 69 48 6 - 68 48 37 -0.67 - 68 45 39 -11 0 0 10 43 41.5 49 282 3 - 69 11 28 - 68 19 39 - 69 15 38 - 68 15 25 -0.67 - 68 11 26 -12 0 0 10 43 55.1 48 283 3 - 68 37 35 - 67 45 5 - 68 41 48 - 67 40 48 -0.67 - 67 35 44 -13 0 0 10 44 8.7 47 283 4 - 68 2 15 - 67 9 1 - 68 6 32 - 67 4 40 -0.67 - 66 58 29 -14 0 0 10 44 22.2 46 284 4 - 67 25 24 - 66 31 22 - 67 29 45 - 66 26 57 -0.67 - 66 19 35 -15 0 0 10 44 35.7 45 285 5 - 66 46 56 - 65 52 1 - 66 51 21 - 65 47 32 -0.67 - 65 38 56 -16 0 0 10 44 49.2 44 285 6 - 66 6 44 - 65 10 53 - 66 11 14 - 65 6 19 -0.67 - 64 56 23 -17 0 0 10 45 2.5 43 286 6 - 65 24 43 - 64 27 49 - 65 29 17 - 64 23 10 -0.68 - 64 11 50 -18 0 0 10 45 15.8 42 286 7 - 64 40 43 - 63 42 42 - 64 45 22 - 63 37 58 -0.68 - 63 25 7 -19 0 0 10 45 29.1 41 287 8 - 63 54 36 - 62 55 22 - 63 59 21 - 62 50 31 -0.68 - 62 36 5 -20 0 0 10 45 42.3 40 287 8 - 63 6 13 - 62 5 38 - 63 11 4 - 62 0 41 -0.68 - 61 44 31 -21 0 0 10 45 55.3 39 287 9 - 62 15 23 - 61 13 19 - 62 20 21 - 61 8 14 -0.68 - 60 50 13 -22 0 0 10 46 8.4 38 287 10 - 61 21 53 - 60 18 12 - 61 26 59 - 60 12 58 -0.68 - 59 52 56 -23 0 0 10 46 21.3 37 288 11 - 60 25 29 - 59 19 59 - 60 30 43 - 59 14 37 -0.68 - 58 52 22 -24 0 0 10 46 34.1 36 288 11 - 59 25 54 - 58 18 24 - 59 31 18 - 58 12 51 -0.68 - 57 48 11 -25 0 0 10 46 46.9 34 288 12 - 58 22 50 - 57 13 4 - 58 28 24 - 57 7 20 -0.68 - 56 40 0 -26 0 0 10 46 59.6 33 288 13 - 57 15 54 - 56 3 35 - 57 21 40 - 55 57 38 -0.68 - 55 27 20 -27 0 0 10 47 12.1 32 287 14 - 56 4 38 - 54 49 26 - 56 10 37 - 54 43 14 -0.69 - 54 9 35 -28 0 0 10 47 24.6 30 287 15 - 54 48 30 - 53 29 59 - 54 54 45 - 53 23 30 -0.69 - 52 46 3 -29 0 0 10 47 37.0 29 287 16 - 53 26 51 - 52 4 28 - 53 33 23 - 51 57 40 -0.69 - 51 15 50 -30 0 0 10 47 49.3 27 286 17 - 51 58 50 - 50 31 54 - 52 5 43 - 50 24 42 -0.69 - 49 37 45 -31 0 0 10 48 1.4 25 286 18 - 50 23 24 - 48 50 59 - 50 30 41 - 48 43 18 -0.69 - 47 50 14 -32 0 0 10 48 13.5 24 285 20 - 48 39 7 - 46 59 58 - 48 46 54 - 46 51 41 -0.69 - 45 51 7 -33 0 0 10 48 25.4 22 284 21 - 46 44 4 - 44 56 23 - 46 52 29 - 44 47 20 -0.70 - 43 37 11 -34 0 0 10 48 37.3 20 283 22 - 44 35 29 - 42 36 28 - 44 44 43 - 42 26 23 -0.70 - 41 3 21 -35 0 0 10 48 49.0 17 282 24 - 42 9 5 - 39 54 4 - 42 19 26 - 39 42 28 -0.71 - 38 0 32 -36 0 0 10 49 0.7 15 280 26 - 39 17 37 - 36 37 31 - 39 29 38 - 36 23 25 -0.72 - 34 9 1 -37 0 0 10 49 12.3 11 278 28 - 35 46 40 - 32 18 16 - 36 1 32 - 31 58 40 -0.75 - 28 20 18 -38 0 0 10 49 24.0 7 274 32 - 30 56 34 - 24 13 20 - 31 18 22 - 22 58 39 -0.89 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 447-003977 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 03 35.4289 DE: -00 41 04.443 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 03 35.4295 DE: -00 41 04.442 * 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: (304) Olga asteroid class: approx. diameter [km]: 69 approx. diameter ["]: 0.078 distance from Earth [AU]: 1.22420 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#72 date of fit: 2023 Aug 23 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): 0.006", 0.001", 78.009° remarks: * orbital elements for (304)Olga : Mean anomaly = 31.9445274463 deg Arg. of pericenter = 172.5720502097 deg Long. of node = 159.0109844110 deg Inclination = 15.8467355796 deg Eccentricity = 0.2219180713 Semimajor axis = 2.4037489198 AU Perihelion dist = 1.8703135958 AU Mag: H = 10.08, G = 0.07 Epoch of elements : MJD 60202.44375000 TDT (2023 Sep 15.4438) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#722023Aug23,8.14,2023,9,15,10.648755,0.508081,0.176566,1.565483,-4.512108,-0.004177,-0.000245,0.000001,0.000001 -107.6680,-0.5895,19.10,3.04,False UCAC4 447-003977,3.05984136,-0.6845674,0.00,12.32,0.00,0.0,0,,3.08010105,-0.5894953,1.12,0.00,0,0,0 304,Olga,12.96,68.900,1.2242,0,0,0.749,-32.42,,3.8,0 0,31.8272,2023,9,15,172.5721,159.0110,15.8467,0.22192,2.40375,1.87031,9.90,5.0,0.15 1.081,0.0063,0.0006,78,0.0064,Known errors,-1.00,0,-1,-1 20230915_003977,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org