IOTA/IOTA-ES occultation update for (131) Vala / UCAC4 488-002214 event on 2023 Jan 03, 23:33 UT Visible from Europe, SE USA Summary ------- On 2023 Jan 03 UT, the 34.7 km diameter asteroid (131) Vala will occult a 12.3 mag star in the constellation Pisces for observers along a path across Europe, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.65 mag to 14.86 mag (the magnitude of the asteroid) for at most 3.170 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 Jan 03, 23:24 - 2023 Jan 03, 23:42 * geocentric midpoint of event [JD]: 2459948.48142992 * magnitude of target star: 12.31 * magnitude drop [mag]: 2.65 * estimated maximum duration [s]: 3.170 * Moon: 92 % sunlit, 46° distance * Sun: 101° distance * rough path description: Europe, SE USA The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 65°) * approx speed of asteroid's shadow [km/s]: 10.9579 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 488-002214 by 131 Vala on 2023 Jan 3 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 -159 0 0 -11 27 21 23 24 14.7 1 82 75 -11 37 35 -11 17 6 -11 39 22 -11 15 19 .... -158 0 0 -11 18 37 23 24 14.9 2 82 74 -11 28 52 -11 8 20 -11 30 39 -11 6 34 -0.30 -157 0 0 -11 9 14 23 24 15.2 2 82 73 -11 19 31 -10 58 57 -11 21 18 -10 57 10 -0.35 -156 0 0 -10 59 14 23 24 15.8 3 82 72 -11 9 31 -10 48 55 -11 11 18 -10 47 8 -0.36 -155 0 0 -10 48 34 23 24 16.6 4 81 71 -10 58 54 -10 38 15 -11 0 41 -10 36 27 -0.37 -154 0 0 -10 37 17 23 24 17.5 5 81 70 -10 47 37 -10 26 55 -10 49 24 -10 25 8 -0.38 -153 0 0 -10 25 20 23 24 18.7 7 81 70 -10 35 42 -10 14 57 -10 37 29 -10 13 9 -0.39 -152 0 0 -10 12 44 23 24 20.0 8 81 69 -10 23 7 -10 2 20 -10 24 55 -10 0 32 -0.39 -151 0 0 - 9 59 29 23 24 21.6 9 81 68 -10 9 54 - 9 49 3 -10 11 42 - 9 47 15 -0.39 -150 0 0 - 9 45 35 23 24 23.3 10 80 67 - 9 56 1 - 9 35 8 - 9 57 50 - 9 33 19 -0.39 -149 0 0 - 9 31 1 23 24 25.3 11 80 66 - 9 41 29 - 9 20 32 - 9 43 18 - 9 18 43 -0.40 -148 0 0 - 9 15 47 23 24 27.4 12 80 65 - 9 26 17 - 9 5 17 - 9 28 6 - 9 3 27 -0.40 -147 0 0 - 8 59 54 23 24 29.8 13 80 64 - 9 10 26 - 8 49 21 - 9 12 15 - 8 47 32 -0.40 -146 0 0 - 8 43 20 23 24 32.4 14 80 63 - 8 53 54 - 8 32 46 - 8 55 44 - 8 30 56 -0.40 -145 0 0 - 8 26 7 23 24 35.1 15 80 62 - 8 36 42 - 8 15 30 - 8 38 32 - 8 13 40 -0.40 -144 0 0 - 8 8 13 23 24 38.1 16 80 61 - 8 18 50 - 7 57 34 - 8 20 41 - 7 55 44 -0.40 -143 0 0 - 7 49 38 23 24 41.3 17 80 60 - 8 0 18 - 7 38 58 - 8 2 9 - 7 37 7 -0.40 -142 0 0 - 7 30 23 23 24 44.8 18 79 59 - 7 41 5 - 7 19 41 - 7 42 56 - 7 17 49 -0.40 -141 0 0 - 7 10 27 23 24 48.4 19 79 58 - 7 21 12 - 6 59 43 - 7 23 3 - 6 57 51 -0.41 -140 0 0 - 6 49 51 23 24 52.3 20 79 57 - 7 0 37 - 6 39 4 - 7 2 29 - 6 37 11 -0.41 -139 0 0 - 6 28 33 23 24 56.4 21 79 56 - 6 39 22 - 6 17 44 - 6 41 14 - 6 15 51 -0.41 -138 0 0 - 6 6 34 23 25 0.7 22 79 55 - 6 17 26 - 5 55 42 - 6 19 18 - 5 53 49 -0.41 -137 0 0 - 5 43 55 23 25 5.2 23 79 54 - 5 54 48 - 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86 0 0 25 50 11 23 33 19.2 68 144 -6 25 37 17 26 3 7 25 35 3 26 5 21 -0.40 - 85 0 0 26 33 6 23 33 31.2 68 147 -8 26 20 12 26 46 1 26 17 58 26 48 16 -0.40 - 84 0 0 27 15 44 23 33 43.1 68 151 -9 27 2 50 27 28 39 27 0 37 27 30 54 -0.40 - 83 0 0 27 58 4 23 33 54.9 68 154 -10 27 45 11 28 10 58 27 42 57 28 13 13 -0.40 - 82 0 0 28 40 3 23 34 6.7 68 157 -11 28 27 11 28 52 57 28 24 57 28 55 11 -0.40 - 81 0 0 29 21 41 23 34 18.3 67 161 -12 29 8 50 29 34 34 29 6 36 29 36 48 -0.40 - 80 0 0 30 2 56 23 34 29.7 67 164 -13 29 50 5 30 15 48 29 47 52 30 18 2 -0.40 - 79 0 0 30 43 46 23 34 41.1 66 167 -14 30 30 56 30 56 37 30 28 43 30 58 50 -0.40 - 78 0 0 31 24 10 23 34 52.3 66 170 -15 31 11 22 31 36 59 31 9 9 31 39 13 -0.40 - 77 0 0 32 4 7 23 35 3.4 65 172 -16 31 51 20 32 16 55 31 49 7 32 19 8 -0.40 - 76 0 0 32 43 35 23 35 14.3 65 175 -17 32 30 50 32 56 21 32 28 37 32 58 34 -0.40 - 75 0 0 33 22 33 23 35 25.1 64 177 -18 33 9 50 33 35 18 33 7 38 33 37 31 -0.39 - 74 0 0 34 1 1 23 35 35.7 64 180 -19 33 48 20 34 13 44 33 46 8 34 15 56 -0.39 - 73 0 0 34 38 57 23 35 46.1 63 182 -20 34 26 18 34 51 38 34 24 6 34 53 50 -0.39 - 72 0 0 35 16 20 23 35 56.4 62 184 -21 35 3 43 35 28 59 35 1 32 35 31 11 -0.39 - 71 0 0 35 53 10 23 36 6.5 62 186 -22 35 40 35 36 5 47 35 38 25 36 7 58 -0.39 - 70 0 0 36 29 26 23 36 16.4 61 188 -23 36 16 53 36 42 0 36 14 43 36 44 11 -0.39 - 69 0 0 37 5 7 23 36 26.2 60 190 -24 36 52 37 37 17 39 36 50 27 37 19 49 -0.39 - 68 0 0 37 40 13 23 36 35.8 60 192 -25 37 27 45 37 52 42 37 25 36 37 54 52 -0.39 - 67 0 0 38 14 43 23 36 45.2 59 194 -26 38 2 18 38 27 10 38 0 9 38 29 19 -0.39 - 66 0 0 38 48 36 23 36 54.4 58 196 -27 38 36 14 39 1 0 38 34 5 39 3 9 -0.39 - 65 0 0 39 21 53 23 37 3.4 57 197 -28 39 9 33 39 34 14 39 7 25 39 36 23 -0.39 - 64 0 0 39 54 33 23 37 12.3 56 199 -29 39 42 16 40 6 51 39 40 8 40 8 59 -0.39 - 63 0 0 40 26 36 23 37 20.9 56 200 -29 40 14 21 40 38 51 40 12 14 40 40 59 -0.39 - 62 0 0 40 58 1 23 37 29.4 55 202 -30 40 45 49 41 10 13 40 43 43 41 12 20 -0.39 - 61 0 0 41 28 49 23 37 37.7 54 203 -31 41 16 40 41 40 58 41 14 34 41 43 5 -0.39 - 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47 0 0 47 34 56 23 39 16.1 44 220 -41 47 23 30 47 46 22 47 21 32 47 48 21 -0.39 - 46 0 0 47 56 35 23 39 21.9 43 221 -42 47 45 13 48 7 58 47 43 14 48 9 57 -0.39 - 45 0 0 48 17 40 23 39 27.6 42 222 -42 48 6 20 48 29 0 48 4 23 48 30 58 -0.39 - 44 0 0 48 38 11 23 39 33.2 41 223 -43 48 26 54 48 49 28 48 24 57 48 51 26 -0.39 - 43 0 0 48 58 9 23 39 38.6 41 224 -43 48 46 55 49 9 23 48 44 58 49 11 20 -0.39 - 42 0 0 49 17 33 23 39 43.9 40 225 -44 49 6 22 49 28 45 49 4 26 49 30 41 -0.39 - 41 0 0 49 36 25 23 39 49.0 39 226 -44 49 25 17 49 47 33 49 23 21 49 49 29 -0.39 - 40 0 0 49 54 44 23 39 54.0 39 227 -45 49 43 39 50 5 50 49 41 44 50 7 46 -0.39 - 39 0 0 50 12 32 23 39 58.9 38 228 -45 50 1 29 50 23 35 49 59 34 50 25 30 -0.39 - 38 0 0 50 29 48 23 40 3.7 37 229 -46 50 18 48 50 40 48 50 16 54 50 42 43 -0.39 - 37 0 0 50 46 32 23 40 8.3 37 230 -46 50 35 35 50 57 31 50 33 42 50 59 25 -0.39 - 36 0 0 51 2 47 23 40 12.8 36 231 -47 50 51 52 51 13 42 50 49 59 51 15 36 -0.39 - 35 0 0 51 18 31 23 40 17.2 35 232 -47 51 7 39 51 29 24 51 5 46 51 31 17 -0.39 - 34 0 0 51 33 45 23 40 21.5 35 233 -48 51 22 55 51 44 35 51 21 3 51 46 28 -0.39 - 33 0 0 51 48 30 23 40 25.7 34 233 -48 51 37 42 51 59 18 51 35 50 52 1 10 -0.39 - 32 0 0 52 2 45 23 40 29.8 33 234 -49 51 52 0 52 13 31 51 50 9 52 15 23 -0.39 - 31 0 0 52 16 32 23 40 33.8 33 235 -49 52 5 49 52 27 15 52 3 58 52 29 7 -0.39 - 30 0 0 52 29 51 23 40 37.6 32 236 -50 52 19 10 52 40 32 52 17 19 52 42 23 -0.39 - 29 0 0 52 42 41 23 40 41.4 31 237 -50 52 32 3 52 53 20 52 30 13 52 55 11 -0.39 - 28 0 0 52 55 4 23 40 45.1 31 238 -50 52 44 28 53 5 41 52 42 38 53 7 31 -0.39 - 27 0 0 53 7 0 23 40 48.6 30 239 -51 52 56 26 53 17 35 52 54 36 53 19 25 -0.39 - 26 0 0 53 18 29 23 40 52.1 30 240 -51 53 7 57 53 29 1 53 6 7 53 30 51 -0.39 - 25 0 0 53 29 31 23 40 55.5 29 241 -51 53 19 1 53 40 2 53 17 12 53 41 51 -0.39 - 24 0 0 53 40 7 23 40 58.8 28 242 -52 53 29 39 53 50 36 53 27 50 53 52 25 -0.39 - 23 0 0 53 50 17 23 41 2.0 28 242 -52 53 39 50 54 0 44 53 38 2 54 2 33 -0.39 - 22 0 0 54 0 1 23 41 5.1 27 243 -52 53 49 37 54 10 27 53 47 48 54 12 15 -0.39 - 21 0 0 54 9 20 23 41 8.2 27 244 -53 53 58 57 54 19 44 53 57 9 54 21 32 -0.39 - 20 0 0 54 18 14 23 41 11.1 26 245 -53 54 7 53 54 28 37 54 6 5 54 30 25 -0.39 - 19 0 0 54 26 44 23 41 14.0 25 246 -53 54 16 24 54 37 4 54 14 36 54 38 52 -0.40 - 18 0 0 54 34 48 23 41 16.8 25 247 -54 54 24 30 54 45 8 54 22 43 54 46 55 -0.40 - 17 0 0 54 42 29 23 41 19.5 24 248 -54 54 32 12 54 52 47 54 30 25 54 54 34 -0.40 - 16 0 0 54 49 45 23 41 22.2 24 249 -54 54 39 29 55 0 2 54 37 43 55 1 49 -0.40 - 15 0 0 54 56 38 23 41 24.7 23 249 -54 54 46 23 55 6 53 54 44 37 55 8 40 -0.40 - 14 0 0 55 3 7 23 41 27.2 22 250 -54 54 52 54 55 13 21 54 51 7 55 15 8 -0.40 - 13 0 0 55 9 13 23 41 29.6 22 251 -55 54 59 0 55 19 26 54 57 14 55 21 12 -0.40 - 12 0 0 55 14 55 23 41 32.0 21 252 -55 55 4 44 55 25 8 55 2 58 55 26 54 -0.40 - 11 0 0 55 20 15 23 41 34.3 21 253 -55 55 10 5 55 30 26 55 8 19 55 32 12 -0.40 - 10 0 0 55 25 12 23 41 36.5 20 254 -55 55 15 2 55 35 22 55 13 17 55 37 8 -0.40 - 9 0 0 55 29 46 23 41 38.6 20 255 -55 55 19 37 55 39 55 55 17 52 55 41 41 -0.40 - 8 0 0 55 33 58 23 41 40.7 19 255 -56 55 23 50 55 44 6 55 22 4 55 45 52 -0.40 - 7 0 0 55 37 47 23 41 42.7 18 256 -56 55 27 40 55 47 55 55 25 54 55 49 40 -0.40 - 6 0 0 55 41 14 23 41 44.7 18 257 -56 55 31 7 55 51 21 55 29 22 55 53 7 -0.40 - 5 0 0 55 44 19 23 41 46.5 17 258 -56 55 34 13 55 54 26 55 32 28 55 56 11 -0.40 - 4 0 0 55 47 2 23 41 48.4 17 259 -56 55 36 56 55 57 8 55 35 11 55 58 53 -0.40 - 3 0 0 55 49 23 23 41 50.1 16 260 -56 55 39 18 55 59 29 55 37 33 56 1 14 -0.40 - 2 0 0 55 51 22 23 41 51.8 16 261 -56 55 41 18 56 1 28 55 39 33 56 3 13 -0.40 - 1 0 0 55 53 0 23 41 53.5 15 261 -56 55 42 55 56 3 6 55 41 11 56 4 50 -0.40 0 0 0 55 54 16 23 41 55.0 14 262 -57 55 44 12 56 4 21 55 42 27 56 6 6 -0.40 1 0 0 55 55 10 23 41 56.5 14 263 -57 55 45 6 56 5 15 55 43 21 56 7 0 -0.41 2 0 0 55 55 43 23 41 58.0 13 264 -57 55 45 39 56 5 48 55 43 54 56 7 33 -0.41 3 0 0 55 55 54 23 41 59.4 13 265 -57 55 45 50 56 5 59 55 44 5 56 7 44 -0.41 4 0 0 55 55 44 23 42 0.7 12 266 -57 55 45 40 56 5 49 55 43 55 56 7 34 -0.41 5 0 0 55 55 12 23 42 2.0 12 266 -57 55 45 8 56 5 18 55 43 23 56 7 3 -0.41 6 0 0 55 54 19 23 42 3.2 11 267 -57 55 44 14 56 4 25 55 42 30 56 6 10 -0.41 7 0 0 55 53 4 23 42 4.4 10 268 -57 55 42 59 56 3 10 55 41 14 56 4 55 -0.41 8 0 0 55 51 28 23 42 5.5 10 269 -57 55 41 23 56 1 34 55 39 38 56 3 19 -0.41 9 0 0 55 49 30 23 42 6.5 9 270 -57 55 39 24 55 59 37 55 37 39 56 1 22 -0.41 10 0 0 55 47 11 23 42 7.5 9 271 -57 55 37 4 55 57 18 55 35 19 55 59 3 -0.42 11 0 0 55 44 30 23 42 8.4 8 272 -57 55 34 23 55 54 37 55 32 37 55 56 23 -0.42 12 0 0 55 41 27 23 42 9.3 8 272 -57 55 31 19 55 51 35 55 29 34 55 53 20 -0.42 13 0 0 55 38 2 23 42 10.1 7 273 -57 55 27 54 55 48 11 55 26 8 55 49 57 -0.42 14 0 0 55 34 16 23 42 10.8 7 274 -57 55 24 6 55 44 25 55 22 21 55 46 11 -0.42 15 0 0 55 30 7 23 42 11.5 6 275 -57 55 19 57 55 40 18 55 18 12 55 42 4 -0.43 16 0 0 55 25 37 23 42 12.1 5 276 -56 55 15 26 55 35 48 55 13 40 55 37 34 -0.43 17 0 0 55 20 44 23 42 12.7 5 276 -56 55 10 32 55 30 56 55 8 46 55 32 43 -0.44 18 0 0 55 15 29 23 42 13.2 4 277 -56 55 5 16 55 25 42 55 3 30 55 27 29 -0.44 19 0 0 55 9 51 23 42 13.6 4 278 -56 54 59 37 55 20 6 54 57 51 55 21 53 -0.45 20 0 0 55 3 51 23 42 14.0 3 279 -56 54 53 36 55 14 7 54 51 50 55 15 54 -0.46 21 0 0 54 57 29 23 42 14.3 2 280 -56 54 47 12 55 7 46 54 45 26 55 9 33 -0.48 22 0 0 54 50 43 23 42 14.5 2 281 -56 54 40 25 55 1 1 54 38 38 55 2 48 -0.50 23 0 0 54 43 34 23 42 14.7 1 281 -55 54 33 15 54 53 54 54 31 28 54 55 41 -0.55 24 0 0 54 36 2 23 42 14.8 1 282 -55 54 25 42 54 46 23 54 23 54 54 48 11 -0.68 25 0 0 54 28 7 23 42 14.9 0 283 -55 54 17 45 54 38 29 54 15 57 54 40 17 -2.55 Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 488-002214 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 32 02.5223 DE: +07 30 59.183 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 32 02.5222 DE: +07 30 59.182 * 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: (131) Vala asteroid class: approx. diameter [km]: 35 approx. diameter ["]: 0.022 distance from Earth [AU]: 2.22440 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#88 date of fit: 2022 Nov 22 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", 64.508° remarks: * orbital elements for (131)Vala : Mean anomaly = 178.4071096507 deg Arg. of pericenter = 161.6435281320 deg Long. of node = 65.5601172862 deg Inclination = 4.9627899387 deg Eccentricity = 0.0686038813 Semimajor axis = 2.4319215978 AU Perihelion dist = 2.2650823372 AU Mag: H = 9.96, G = 0.15 Epoch of elements : MJD 59947.98152778 TDT (2023 Jan 03.9815) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#882022Nov22,3.17,2023,1,3,23.554318,-0.202551,0.309123,5.172634,3.390825,0.005350,0.002140,0.000000,0.000000 -73.3319,7.6341,-172.17,-22.77,False UCAC4 488-002214,1.53403398,7.5164398,0.00,12.31,0.00,0.0,0,K,1.55401171,7.6340764,2.65,0.00,0,0,0 131,Vala,14.86,34.7,2.2244,0,0,1.377,13.41,,1.6,0 0,178.1520,2023,1,3,161.6435,65.5601,4.9628,0.06860,2.43192,2.26508,9.99,5.0,0.15 1.087,0.0087,0.0015,65,0.0019,Known errors,-1.00,-1,-1,-1 20230103_002214,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org