IOTA/IOTA-ES occultation update for (498) Tokio / UCAC4 530-012855 event on 2023 Sep 14, 17:42 UT Visible from New Zealand Summary ------- On 2023 Sep 14 UT, the 83 km diameter asteroid (498) Tokio will occult a 11.3 mag star in the constellation Orion for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.47 mag to 13.61 mag (the magnitude of the asteroid) for at most 5.610 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 14, 17:38 - 2023 Sep 14, 17:45 * geocentric midpoint of event [JD]: 2460202.23770696 * magnitude of target star: 11.26 * magnitude drop [mag]: 2.47 * estimated maximum duration [s]: 5.610 * Moon: 0 % sunlit, 87° distance * Sun: 91° distance * rough path description: New Zealand Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 177 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 74°) * approx speed of asteroid's shadow [km/s]: 14.7887 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 530-012855 by 498 Tokio on 2023 Sep 14 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 122 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -60 24 8 .. .. .. -60 19 49 .... 123 0 0 -61 1 20 17 38 57.9 0 55 -28 .. .. .. -60 4 17 .. .. .. -59 59 59 .... 124 0 0 -60 41 18 17 38 58.0 1 54 -28 -61 40 27 -59 44 25 -61 45 6 -59 40 8 0.83 125 0 0 -60 21 15 17 38 58.1 1 54 -28 -61 20 12 -59 24 32 -61 24 51 -59 20 15 1.28 126 0 0 -60 1 11 17 38 58.4 2 53 -28 -60 59 57 -59 4 39 -61 4 35 -59 0 23 1.46 127 0 0 -59 41 8 17 38 58.8 3 52 -28 -60 39 42 -58 44 46 -60 44 19 -58 40 31 1.56 128 0 0 -59 21 6 17 38 59.3 3 51 -28 -60 19 28 -58 24 54 -60 24 3 -58 20 40 1.62 129 0 0 -59 1 5 17 38 59.9 4 50 -28 -59 59 15 -58 5 5 -60 3 49 -58 0 51 1.66 130 0 0 -58 41 7 17 39 0.6 4 49 -28 -59 39 4 -57 45 17 -59 43 38 -57 41 5 1.69 131 0 0 -58 21 12 17 39 1.4 5 48 -28 -59 18 56 -57 25 33 -59 23 29 -57 21 21 1.72 132 0 0 -58 1 20 17 39 2.3 6 48 -28 -58 58 52 -57 5 53 -59 3 23 -57 1 42 1.74 133 0 0 -57 41 33 17 39 3.4 6 47 -28 -58 38 52 -56 46 18 -58 43 22 -56 42 7 1.75 134 0 0 -57 21 51 17 39 4.5 7 46 -28 -58 18 57 -56 26 47 -58 23 26 -56 22 38 1.76 135 0 0 -57 2 15 17 39 5.8 8 45 -27 -57 59 8 -56 7 23 -58 3 36 -56 3 14 1.77 136 0 0 -56 42 46 17 39 7.2 8 44 -27 -57 39 26 -55 48 5 -57 43 53 -55 43 57 1.78 137 0 0 -56 23 24 17 39 8.7 9 43 -27 -57 19 50 -55 28 55 -57 24 16 -55 24 48 1.79 138 0 0 -56 4 9 17 39 10.3 9 42 -27 -57 0 23 -55 9 53 -57 4 48 -55 5 47 1.80 139 0 0 -55 45 4 17 39 12.1 10 42 -27 -56 41 4 -54 50 59 -56 45 28 -54 46 54 1.80 140 0 0 -55 26 8 17 39 14.0 11 41 -26 -56 21 55 -54 32 15 -56 26 18 -54 28 10 1.81 141 0 0 -55 7 22 17 39 16.0 11 40 -26 -56 2 56 -54 13 41 -56 7 17 -54 9 37 1.82 142 0 0 -54 48 46 17 39 18.1 12 39 -26 -55 44 7 -53 55 17 -55 48 27 -53 51 14 1.82 143 0 0 -54 30 22 17 39 20.3 12 38 -25 -55 25 30 -53 37 5 -55 29 49 -53 33 3 1.82 144 0 0 -54 12 10 17 39 22.6 13 37 -25 -55 7 4 -53 19 4 -55 11 23 -53 15 3 1.83 145 0 0 -53 54 10 17 39 25.1 14 36 -25 -54 48 52 -53 1 16 -54 53 9 -52 57 16 1.83 146 0 0 -53 36 24 17 39 27.7 14 35 -24 -54 30 53 -52 43 42 -54 35 9 -52 39 42 1.84 147 0 0 -53 18 52 17 39 30.4 15 34 -24 -54 13 8 -52 26 21 -54 17 23 -52 22 22 1.84 148 0 0 -53 1 34 17 39 33.2 15 34 -24 -53 55 37 -52 9 14 -53 59 52 -52 5 16 1.84 149 0 0 -52 44 31 17 39 36.2 16 33 -23 -53 38 22 -51 52 22 -53 42 35 -51 48 26 1.84 150 0 0 -52 27 43 17 39 39.2 16 32 -23 -53 21 22 -51 35 46 -53 25 35 -51 31 50 1.85 151 0 0 -52 11 12 17 39 42.4 17 31 -22 -53 4 39 -51 19 26 -53 8 50 -51 15 31 1.85 152 0 0 -51 54 58 17 39 45.6 18 30 -22 -52 48 13 -51 3 22 -52 52 23 -50 59 28 1.85 153 0 0 -51 39 1 17 39 49.0 18 29 -21 -52 32 4 -50 47 36 -52 36 13 -50 43 42 1.85 154 0 0 -51 23 21 17 39 52.5 19 28 -21 -52 16 13 -50 32 7 -52 20 21 -50 28 14 1.86 155 0 0 -51 8 0 17 39 56.1 19 27 -20 -52 0 41 -50 16 56 -52 4 48 -50 13 4 1.86 156 0 0 -50 52 58 17 39 59.8 20 26 -20 -51 45 27 -50 2 3 -51 49 34 -49 58 12 1.86 157 0 0 -50 38 15 17 40 3.6 20 25 -19 -51 30 33 -49 47 30 -51 34 39 -49 43 40 1.86 158 0 0 -50 23 51 17 40 7.5 21 24 -19 -51 15 59 -49 33 17 -51 20 4 -49 29 27 1.86 159 0 0 -50 9 48 17 40 11.5 21 23 -18 -51 1 46 -49 19 23 -51 5 50 -49 15 34 1.87 160 0 0 -49 56 6 17 40 15.6 22 22 -18 -50 47 53 -49 5 50 -50 51 56 -49 2 1 1.87 161 0 0 -49 42 44 17 40 19.7 22 21 -17 -50 34 22 -48 52 37 -50 38 24 -48 48 49 1.87 162 0 0 -49 29 44 17 40 24.0 23 20 -17 -50 21 12 -48 39 46 -50 25 14 -48 35 59 1.87 163 0 0 -49 17 6 17 40 28.3 23 19 -16 -50 8 25 -48 27 16 -50 12 26 -48 23 30 1.87 164 0 0 -49 4 50 17 40 32.8 23 18 -15 -49 56 0 -48 15 9 -50 0 0 -48 11 23 1.88 165 0 0 -48 52 57 17 40 37.3 24 17 -15 -49 43 58 -48 3 24 -49 47 58 -47 59 38 1.88 166 0 0 -48 41 27 17 40 41.9 24 16 -14 -49 32 20 -47 52 1 -49 36 18 -47 48 16 1.88 167 0 0 -48 30 20 17 40 46.5 24 15 -14 -49 21 4 -47 41 2 -49 25 3 -47 37 18 1.88 168 0 0 -48 19 37 17 40 51.2 25 14 -13 -49 10 13 -47 30 26 -49 14 11 -47 26 42 1.88 169 0 0 -48 9 18 17 40 56.0 25 13 -12 -48 59 47 -47 20 14 -49 3 44 -47 16 31 1.88 170 0 0 -47 59 23 17 41 0.9 25 12 -12 -48 49 45 -47 10 26 -48 53 41 -47 6 43 1.88 171 0 0 -47 49 53 17 41 5.8 26 11 -11 -48 40 7 -47 1 2 -48 44 3 -46 57 20 1.89 172 0 0 -47 40 47 17 41 10.8 26 10 -10 -48 30 55 -46 52 3 -48 34 50 -46 48 21 1.89 173 0 0 -47 32 7 17 41 15.8 26 9 -10 -48 22 8 -46 43 28 -48 26 3 -46 39 47 1.89 174 0 0 -47 23 52 17 41 20.9 27 8 -9 -48 13 47 -46 35 19 -48 17 41 -46 31 38 1.89 175 0 0 -47 16 3 17 41 26.0 27 7 -8 -48 5 52 -46 27 35 -48 9 46 -46 23 54 1.89 176 0 0 -47 8 39 17 41 31.1 27 6 -8 -47 58 23 -46 20 16 -48 2 16 -46 16 36 1.89 177 0 0 -47 1 41 17 41 36.3 27 4 -7 -47 51 20 -46 13 23 -47 55 13 -46 9 43 1.89 178 0 0 -46 55 10 17 41 41.5 27 3 -6 -47 44 44 -46 6 56 -47 48 36 -46 3 17 1.89 179 0 0 -46 49 5 17 41 46.8 27 2 -5 -47 38 34 -46 0 55 -47 42 26 -45 57 16 1.90 -180 0 0 -46 43 26 17 41 52.0 27 1 -5 -47 32 52 -45 55 21 -47 36 43 -45 51 42 1.90 -179 0 0 -46 38 14 17 41 57.3 28 360 -4 -47 27 36 -45 50 12 -47 31 27 -45 46 34 1.90 -178 0 0 -46 33 29 17 42 2.6 28 359 -3 -47 22 47 -45 45 30 -47 26 38 -45 41 52 1.90 -177 0 0 -46 29 11 17 42 8.0 28 358 -3 -47 18 26 -45 41 15 -47 22 17 -45 37 37 1.90 -176 0 0 -46 25 20 17 42 13.3 28 357 -2 -47 14 32 -45 37 27 -47 18 22 -45 33 49 1.90 -175 0 0 -46 21 56 17 42 18.6 28 356 -1 -47 11 5 -45 34 5 -47 14 56 -45 30 27 1.90 -174 0 0 -46 18 59 17 42 23.9 28 354 -1 -47 8 6 -45 31 10 -47 11 56 -45 27 33 1.90 -173 0 0 -46 16 30 17 42 29.3 28 353 0 -47 5 35 -45 28 43 -47 9 25 -45 25 5 1.90 -172 0 0 -46 14 28 17 42 34.6 28 352 1 -47 3 31 -45 26 42 -47 7 21 -45 23 4 1.90 -171 0 0 -46 12 53 17 42 39.9 28 351 2 -47 1 55 -45 25 8 -47 5 45 -45 21 31 1.90 -170 0 0 -46 11 45 17 42 45.2 27 350 2 -47 0 47 -45 24 2 -47 4 36 -45 20 25 1.90 -169 0 0 -46 11 6 17 42 50.5 27 349 3 -47 0 6 -45 23 22 -47 3 56 -45 19 45 1.90 -168 0 0 -46 10 53 17 42 55.7 27 348 4 -46 59 53 -45 23 10 -47 3 43 -45 19 33 1.91 -167 0 0 -46 11 8 17 43 1.0 27 347 4 -47 0 9 -45 23 25 -47 3 58 -45 19 48 1.91 -166 0 0 -46 11 51 17 43 6.2 27 346 5 -47 0 51 -45 24 7 -47 4 41 -45 20 30 1.91 -165 0 0 -46 13 0 17 43 11.3 27 345 6 -47 2 2 -45 25 17 -47 5 52 -45 21 39 1.91 -164 0 0 -46 14 38 17 43 16.4 26 343 6 -47 3 40 -45 26 53 -47 7 30 -45 23 15 1.91 -163 0 0 -46 16 42 17 43 21.5 26 342 7 -47 5 46 -45 28 56 -47 9 36 -45 25 19 1.91 -162 0 0 -46 19 14 17 43 26.5 26 341 8 -47 8 20 -45 31 26 -47 12 10 -45 27 49 1.91 -161 0 0 -46 22 13 17 43 31.5 26 340 9 -47 11 21 -45 34 23 -47 15 11 -45 30 46 1.91 -160 0 0 -46 25 39 17 43 36.4 25 339 9 -47 14 49 -45 37 47 -47 18 39 -45 34 9 1.91 -159 0 0 -46 29 32 17 43 41.3 25 338 10 -47 18 45 -45 41 38 -47 22 35 -45 38 0 1.91 -158 0 0 -46 33 52 17 43 46.1 25 337 11 -47 23 8 -45 45 55 -47 26 59 -45 42 17 1.91 -157 0 0 -46 38 38 17 43 50.9 24 336 11 -47 27 58 -45 50 38 -47 31 49 -45 47 0 1.91 -156 0 0 -46 43 52 17 43 55.5 24 335 12 -47 33 14 -45 55 48 -47 37 6 -45 52 10 1.91 -155 0 0 -46 49 31 17 44 0.1 24 334 12 -47 38 58 -46 1 24 -47 42 50 -45 57 45 1.91 -154 0 0 -46 55 37 17 44 4.7 23 333 13 -47 45 8 -46 7 26 -47 49 0 -46 3 47 1.91 -153 0 0 -47 2 9 17 44 9.1 23 332 14 -47 51 45 -46 13 54 -47 55 38 -46 10 15 1.91 -152 0 0 -47 9 7 17 44 13.5 22 331 14 -47 58 48 -46 20 48 -48 2 41 -46 17 8 1.91 -151 0 0 -47 16 31 17 44 17.8 22 330 15 -48 6 17 -46 28 7 -48 10 10 -46 24 26 1.91 -150 0 0 -47 24 20 17 44 22.0 21 329 15 -48 14 12 -46 35 51 -48 18 5 -46 32 10 1.91 -149 0 0 -47 32 35 17 44 26.1 21 328 16 -48 22 32 -46 44 0 -48 26 26 -46 40 19 1.91 -148 0 0 -47 41 14 17 44 30.1 21 327 17 -48 31 18 -46 52 34 -48 35 12 -46 48 52 1.91 -147 0 0 -47 50 19 17 44 34.0 20 326 17 -48 40 28 -47 1 32 -48 44 24 -46 57 50 1.91 -146 0 0 -47 59 47 17 44 37.8 19 325 18 -48 50 4 -47 10 54 -48 54 0 -47 7 12 1.91 -145 0 0 -48 9 40 17 44 41.6 19 325 18 -49 0 4 -47 20 41 -49 4 1 -47 16 58 1.91 -144 0 0 -48 19 57 17 44 45.2 18 324 19 -49 10 29 -47 30 51 -49 14 26 -47 27 8 1.91 -143 0 0 -48 30 38 17 44 48.7 18 323 19 -49 21 17 -47 41 25 -49 25 14 -47 37 41 1.91 -142 0 0 -48 41 42 17 44 52.1 17 322 20 -49 32 29 -47 52 21 -49 36 27 -47 48 37 1.91 -141 0 0 -48 53 9 17 44 55.4 17 321 20 -49 44 4 -48 3 41 -49 48 3 -47 59 56 1.91 -140 0 0 -49 4 58 17 44 58.6 16 320 21 -49 56 2 -48 15 22 -50 0 1 -48 11 37 1.91 -139 0 0 -49 17 10 17 45 1.6 16 319 21 -50 8 22 -48 27 26 -50 12 23 -48 23 40 1.92 -138 0 0 -49 29 44 17 45 4.6 15 318 22 -50 21 5 -48 39 51 -50 25 6 -48 36 4 1.92 -137 0 0 -49 42 39 17 45 7.4 14 317 22 -50 34 10 -48 52 38 -50 38 12 -48 48 50 1.92 -136 0 0 -49 55 55 17 45 10.1 14 317 22 -50 47 36 -49 5 45 -50 51 38 -49 1 57 1.92 -135 0 0 -50 9 32 17 45 12.7 13 316 23 -51 1 23 -49 19 13 -51 5 26 -49 15 25 1.92 -134 0 0 -50 23 30 17 45 15.2 13 315 23 -51 15 30 -49 33 2 -51 19 35 -49 29 12 1.92 -133 0 0 -50 37 47 17 45 17.5 12 314 24 -51 29 58 -49 47 9 -51 34 3 -49 43 19 1.92 -132 0 0 -50 52 23 17 45 19.8 11 313 24 -51 44 45 -50 1 36 -51 48 51 -49 57 45 1.92 -131 0 0 -51 7 19 17 45 21.8 11 312 24 -51 59 52 -50 16 22 -52 3 59 -50 12 30 1.92 -130 0 0 -51 22 33 17 45 23.8 10 312 25 -52 15 17 -50 31 26 -52 19 24 -50 27 33 1.93 -129 0 0 -51 38 5 17 45 25.7 9 311 25 -52 31 0 -50 46 47 -52 35 9 -50 42 54 1.93 -128 0 0 -51 53 54 17 45 27.4 9 310 25 -52 47 1 -51 2 27 -52 51 11 -50 58 33 1.93 -127 0 0 -52 10 1 17 45 29.0 8 309 25 -53 3 19 -51 18 22 -53 7 30 -51 14 28 1.93 -126 0 0 -52 26 24 17 45 30.4 7 308 26 -53 19 54 -51 34 34 -53 24 6 -51 30 39 1.94 -125 0 0 -52 43 3 17 45 31.8 7 308 26 -53 36 45 -51 51 2 -53 40 57 -51 47 6 1.94 -124 0 0 -52 59 57 17 45 33.0 6 307 26 -53 53 51 -52 7 45 -53 58 5 -52 3 49 1.95 -123 0 0 -53 17 6 17 45 34.1 5 306 26 -54 11 13 -52 24 43 -54 15 27 -52 20 45 1.95 -122 0 0 -53 34 29 17 45 35.0 5 305 26 -54 28 49 -52 41 55 -54 33 4 -52 37 57 1.96 -121 0 0 -53 52 6 17 45 35.8 4 304 26 -54 46 38 -52 59 21 -54 50 55 -52 55 21 1.97 -120 0 0 -54 9 56 17 45 36.5 4 303 27 -55 4 41 -53 16 59 -55 8 59 -53 12 59 1.99 -119 0 0 -54 27 58 17 45 37.1 3 303 27 -55 22 56 -53 34 50 -55 27 15 -53 30 49 2.01 -118 0 0 -54 46 13 17 45 37.6 2 302 27 -55 41 24 -53 52 53 -55 45 44 -53 48 51 2.04 -117 0 0 -55 4 38 17 45 37.9 2 301 27 -56 0 2 -54 11 6 -56 4 23 -54 7 4 2.11 -116 0 0 -55 23 15 17 45 38.1 1 300 27 -56 18 52 -54 29 31 -56 23 14 -54 25 27 2.27 -115 0 0 -55 42 1 17 45 38.2 0 299 27 .. .. .. -54 48 5 .. .. .. -54 44 0 3.21 -114 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -55 6 49 .. .. .. -55 2 43 .... Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 530-012855 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 18 16.9015 DE: +15 53 25.071 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 18 16.9016 DE: +15 53 25.071 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (498) Tokio asteroid class: approx. diameter [km]: 83 approx. diameter ["]: 0.054 distance from Earth [AU]: 2.13620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#98 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): 0.009", 0.001", 73.787° remarks: * orbital elements for (498)Tokio : Mean anomaly = 51.7098491096 deg Arg. of pericenter = 241.8986530063 deg Long. of node = 97.1584933531 deg Inclination = 9.4982206869 deg Eccentricity = 0.2238490950 Semimajor axis = 2.6519151554 AU Perihelion dist = 2.0582863479 AU Mag: H = 8.92, G = 0.15 Epoch of elements : MJD 60201.73777778 TDT (2023 Sep 14.7378) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#982023Aug23,5.61,2023,9,14,17.704967,0.047865,-0.881742,8.334834,0.453361,-0.005522,-0.000373,0.000000,0.000000 -179.1078,15.9168,-86.68,3.31,False UCAC4 530-012855,5.30469484,15.8902974,0.00,11.26,0.00,0.0,0,,5.32727301,15.9167868,2.47,0.00,0,0,0 498,Tokio,13.61,83.000,2.1362,0,0,2.378,1.87,,4.8,0 0,51.5415,2023,9,14,241.8987,97.1585,9.4982,0.22385,2.65192,2.05829,8.92,5.0,0.15 1.038,0.0087,0.0006,74,0.0087,Known errors,-1.00,0,-1,-1 20230914_012855,60182.99 ------ 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