IOTA/IOTA-ES occultation update for (1585) Union / TYC 1392-00864-1 event on 2024 Apr 10, 12:29 UT Visible from Summary ------- On 2024 Apr 10 UT, the 51.5284740342034 km diameter asteroid (1585) Union will occult a 9.8 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.56 mag to 15.31 mag (the magnitude of the asteroid) for at most 4.600 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: 2024 Apr 10, 12:19 - 2024 Apr 10, 12:38 * geocentric midpoint of event [JD]: 2460411.02035037 * magnitude of target star: 9.76 * magnitude drop [mag]: 5.56 * estimated maximum duration [s]: 4.600 * Moon: 5 % sunlit, 83° distance * Sun: 107° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.005", 83°) * approx speed of asteroid's shadow [km/s]: 11.2382 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1392-00864-1 by 1585 Union on 2024 Apr 10 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 25 0 0 -24 56 0 12 19 53.5 0 71 46 -25 10 55 -24 41 4 -25 20 19 -24 31 40 .... 26 0 0 -24 36 31 12 19 53.6 1 70 46 -24 51 29 -24 21 32 -25 0 54 -24 12 6 -0.16 27 0 0 -24 16 24 12 19 53.9 2 70 45 -24 31 25 -24 1 22 -24 40 53 -23 51 54 -0.14 28 0 0 -23 55 40 12 19 54.3 3 69 45 -24 10 45 -23 40 35 -24 20 14 -23 31 5 -0.13 29 0 0 -23 34 19 12 19 54.9 4 69 44 -23 49 26 -23 19 11 -23 58 58 -23 9 38 -0.13 30 0 0 -23 12 20 12 19 55.7 5 69 44 -23 27 30 -22 57 8 -23 37 4 -22 47 34 -0.13 31 0 0 -22 49 42 12 19 56.6 6 68 43 -23 4 56 -22 34 28 -23 14 32 -22 24 51 -0.12 32 0 0 -22 26 27 12 19 57.8 7 68 43 -22 41 44 -22 11 9 -22 51 22 -22 1 30 -0.12 33 0 0 -22 2 33 12 19 59.1 8 68 42 -22 17 54 -21 47 11 -22 27 34 -21 37 30 -0.12 34 0 0 -21 38 0 12 20 0.6 9 67 42 -21 53 25 -21 22 35 -22 3 7 -21 12 52 -0.12 35 0 0 -21 12 49 12 20 2.3 10 67 41 -21 28 17 -20 57 20 -21 38 2 -20 47 35 -0.12 36 0 0 -20 46 59 12 20 4.2 11 66 41 -21 2 31 -20 31 27 -21 12 18 -20 21 39 -0.12 37 0 0 -20 20 30 12 20 6.3 12 66 40 -20 36 6 -20 4 54 -20 45 55 -19 55 4 -0.12 38 0 0 -19 53 22 12 20 8.6 13 66 39 -20 9 1 -19 37 42 -20 18 53 -19 27 49 -0.12 39 0 0 -19 25 35 12 20 11.1 14 65 39 -19 41 18 -19 9 51 -19 51 12 -18 59 56 -0.12 40 0 0 -18 57 8 12 20 13.8 15 65 38 -19 12 55 -18 41 20 -19 22 52 -18 31 23 -0.12 41 0 0 -18 28 2 12 20 16.7 16 65 38 -18 43 53 -18 12 11 -18 53 52 -18 2 11 -0.12 42 0 0 -17 58 18 12 20 19.8 18 64 37 -18 14 13 -17 42 22 -18 24 14 -17 32 20 -0.12 43 0 0 -17 27 54 12 20 23.2 19 64 36 -17 43 53 -17 11 54 -17 53 56 -17 1 49 -0.12 44 0 0 -16 56 51 12 20 26.8 20 64 36 -17 12 54 -16 40 47 -17 23 0 -16 30 40 -0.12 45 0 0 -16 25 9 12 20 30.6 21 64 35 -16 41 16 -16 9 1 -16 51 24 -15 58 52 -0.12 46 0 0 -15 52 48 12 20 34.6 22 63 34 -16 8 59 -15 36 37 -16 19 10 -15 26 24 -0.12 47 0 0 -15 19 49 12 20 38.9 23 63 33 -15 36 4 -15 3 33 -15 46 17 -14 53 18 -0.12 48 0 0 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2 8 50 12 23 54.4 55 62 12 1 51 11 2 26 29 1 40 5 2 37 36 -0.11 74 0 0 2 54 10 12 24 4.9 56 63 11 2 36 31 3 11 51 2 25 24 3 22 59 -0.11 75 0 0 3 39 38 12 24 15.6 57 63 10 3 21 58 3 57 20 3 10 50 4 8 29 -0.11 76 0 0 4 25 12 12 24 26.4 58 63 9 4 7 30 4 42 54 3 56 22 4 54 4 -0.11 77 0 0 5 10 49 12 24 37.4 60 64 8 4 53 7 5 28 32 4 41 58 5 39 42 -0.11 78 0 0 5 56 28 12 24 48.5 61 64 7 5 38 45 6 14 12 5 27 36 6 25 22 -0.11 79 0 0 6 42 7 12 24 59.8 62 65 6 6 24 23 6 59 51 6 13 14 7 11 1 -0.11 80 0 0 7 27 43 12 25 11.2 64 65 5 7 9 59 7 45 27 6 58 50 7 56 37 -0.11 81 0 0 8 13 14 12 25 22.7 65 66 4 7 55 31 8 30 58 7 44 22 8 42 9 -0.11 82 0 0 8 58 39 12 25 34.3 66 67 3 8 40 57 9 16 23 8 29 48 9 27 33 -0.11 83 0 0 9 43 56 12 25 46.0 67 68 2 9 26 14 10 1 39 9 15 5 10 12 49 -0.11 84 0 0 10 29 3 12 25 57.7 68 69 1 10 11 21 10 46 45 10 0 13 10 57 54 -0.11 85 0 0 11 13 57 12 26 9.5 70 70 0 10 56 17 11 31 38 10 45 9 11 42 47 -0.11 86 0 0 11 58 37 12 26 21.4 71 71 -1 11 40 58 12 16 17 11 29 51 12 27 25 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36 12 33 18.1 64 235 -29 34 7 14 34 37 59 33 57 33 34 47 41 -0.09 126 0 0 34 44 29 12 33 26.4 63 236 -29 34 29 10 34 59 48 34 19 32 35 9 27 -0.09 127 0 0 35 5 44 12 33 34.5 62 237 -29 34 50 29 35 21 0 34 40 53 35 30 37 -0.09 128 0 0 35 26 22 12 33 42.5 61 238 -30 35 11 11 35 41 34 35 1 36 35 51 9 -0.09 129 0 0 35 46 23 12 33 50.4 61 239 -30 35 31 15 36 1 31 35 21 43 36 11 4 -0.09 130 0 0 36 5 47 12 33 58.1 60 239 -31 35 50 42 36 20 52 35 41 13 36 30 22 -0.09 131 0 0 36 24 35 12 34 5.7 59 240 -31 36 9 33 36 39 36 36 0 6 36 49 4 -0.09 132 0 0 36 42 46 12 34 13.2 58 241 -32 36 27 48 36 57 44 36 18 22 37 7 11 -0.09 133 0 0 37 0 22 12 34 20.6 57 242 -32 36 45 27 37 15 17 36 36 3 37 24 41 -0.09 134 0 0 37 17 22 12 34 27.8 56 243 -33 37 2 30 37 32 14 36 53 9 37 41 36 -0.09 135 0 0 37 33 47 12 34 34.9 55 244 -33 37 18 59 37 48 36 37 9 39 37 57 57 -0.09 136 0 0 37 49 38 12 34 41.9 54 244 -33 37 34 52 38 4 24 37 25 34 38 13 42 -0.09 137 0 0 38 4 54 12 34 48.7 54 245 -34 37 50 11 38 19 37 37 40 55 38 28 53 -0.09 138 0 0 38 19 35 12 34 55.5 53 246 -34 38 4 55 38 34 16 37 55 41 38 43 31 -0.09 139 0 0 38 33 43 12 35 2.1 52 247 -34 38 19 6 38 48 21 38 9 53 38 57 34 -0.09 140 0 0 38 47 18 12 35 8.6 51 248 -35 38 32 43 39 1 53 38 23 32 39 11 5 -0.09 141 0 0 39 0 19 12 35 15.0 50 248 -35 38 45 46 39 14 52 38 36 37 39 24 2 -0.09 142 0 0 39 12 47 12 35 21.3 49 249 -35 38 58 17 39 27 18 38 49 9 39 36 26 -0.09 143 0 0 39 24 43 12 35 27.4 49 250 -36 39 10 15 39 39 11 39 1 9 39 48 18 -0.09 144 0 0 39 36 6 12 35 33.5 48 251 -36 39 21 41 39 50 32 39 12 36 39 59 38 -0.09 145 0 0 39 46 58 12 35 39.4 47 251 -36 39 32 34 40 1 22 39 23 30 40 10 26 -0.09 146 0 0 39 57 17 12 35 45.3 46 252 -37 39 42 56 40 11 39 39 33 53 40 20 42 -0.09 147 0 0 40 7 5 12 35 51.0 45 253 -37 39 52 45 40 21 25 39 43 44 40 30 27 -0.09 148 0 0 40 16 22 12 35 56.6 45 254 -37 40 2 4 40 30 40 39 53 4 40 39 41 -0.09 149 0 0 40 25 7 12 36 2.1 44 254 -37 40 10 51 40 39 24 40 1 52 40 48 23 -0.09 150 0 0 40 33 22 12 36 7.6 43 255 -38 40 19 8 40 47 37 40 10 9 40 56 36 -0.09 151 0 0 40 41 6 12 36 12.9 42 256 -38 40 26 53 40 55 19 40 17 56 41 4 17 -0.10 152 0 0 40 48 20 12 36 18.1 42 256 -38 40 34 8 41 2 32 40 25 12 41 11 29 -0.10 153 0 0 40 55 3 12 36 23.2 41 257 -38 40 40 53 41 9 14 40 31 58 41 18 10 -0.10 154 0 0 41 1 17 12 36 28.3 40 258 -38 40 47 8 41 15 26 40 38 13 41 24 21 -0.10 155 0 0 41 7 1 12 36 33.2 39 259 -39 40 52 53 41 21 9 40 43 59 41 30 3 -0.10 156 0 0 41 12 15 12 36 38.0 38 259 -39 40 58 8 41 26 22 40 49 14 41 35 16 -0.10 157 0 0 41 16 59 12 36 42.8 38 260 -39 41 2 53 41 31 5 40 54 0 41 39 59 -0.10 158 0 0 41 21 14 12 36 47.4 37 261 -39 41 7 9 41 35 20 40 58 17 41 44 12 -0.10 159 0 0 41 25 0 12 36 52.0 36 261 -39 41 10 56 41 39 5 41 2 4 41 47 57 -0.10 160 0 0 41 28 17 12 36 56.4 35 262 -39 41 14 13 41 42 21 41 5 22 41 51 13 -0.10 161 0 0 41 31 4 12 37 0.8 35 263 -40 41 17 1 41 45 8 41 8 10 41 53 59 -0.10 162 0 0 41 33 23 12 37 5.1 34 264 -40 41 19 20 41 47 26 41 10 30 41 56 17 -0.10 163 0 0 41 35 13 12 37 9.3 33 264 -40 41 21 10 41 49 16 41 12 20 41 58 7 -0.10 164 0 0 41 36 34 12 37 13.4 32 265 -40 41 22 32 41 50 37 41 13 42 41 59 27 -0.10 165 0 0 41 37 26 12 37 17.4 32 266 -40 41 23 24 41 51 29 41 14 34 42 0 20 -0.10 166 0 0 41 37 50 12 37 21.3 31 266 -40 41 23 48 41 51 53 41 14 58 42 0 43 -0.10 167 0 0 41 37 45 12 37 25.1 30 267 -40 41 23 43 41 51 48 41 14 53 42 0 38 -0.10 168 0 0 41 37 12 12 37 28.9 29 268 -40 41 23 10 41 51 14 41 14 19 42 0 5 -0.10 169 0 0 41 36 10 12 37 32.5 29 268 -40 41 22 8 41 50 13 41 13 17 41 59 4 -0.10 170 0 0 41 34 39 12 37 36.1 28 269 -40 41 20 37 41 48 42 41 11 46 41 57 34 -0.10 171 0 0 41 32 40 12 37 39.6 27 270 -40 41 18 37 41 46 44 41 9 46 41 55 35 -0.10 172 0 0 41 30 13 12 37 43.0 26 271 -40 41 16 9 41 44 17 41 7 18 41 53 8 -0.10 173 0 0 41 27 16 12 37 46.3 25 271 -40 41 13 12 41 41 21 41 4 20 41 50 13 -0.10 174 0 0 41 23 51 12 37 49.6 25 272 -40 41 9 46 41 37 57 41 0 54 41 46 49 -0.10 175 0 0 41 19 58 12 37 52.7 24 273 -40 41 5 52 41 34 4 40 56 59 41 42 57 -0.10 176 0 0 41 15 35 12 37 55.8 23 273 -40 41 1 29 41 29 42 40 52 36 41 38 36 -0.10 177 0 0 41 10 44 12 37 58.7 22 274 -40 40 56 37 41 24 52 40 47 43 41 33 46 -0.11 178 0 0 41 5 24 12 38 1.6 22 275 -40 40 51 15 41 19 33 40 42 21 41 28 28 -0.11 179 0 0 40 59 35 12 38 4.4 21 275 -40 40 45 25 41 13 45 40 36 30 41 22 41 -0.11 180 0 0 40 53 17 12 38 7.1 20 276 -40 40 39 6 41 7 28 40 30 10 41 16 25 -0.11 -179 0 0 40 46 30 12 38 9.7 19 277 -40 40 32 17 41 0 43 40 23 21 41 9 40 -0.11 -178 0 0 40 39 13 12 38 12.2 19 277 -40 40 24 59 40 53 27 40 16 2 41 2 26 -0.11 -177 0 0 40 31 27 12 38 14.6 18 278 -40 40 17 12 40 45 43 40 8 13 40 54 42 -0.11 -176 0 0 40 23 12 12 38 17.0 17 279 -40 40 8 55 40 37 29 39 59 55 40 46 29 -0.11 -175 0 0 40 14 27 12 38 19.2 16 279 -40 40 0 8 40 28 46 39 51 7 40 37 47 -0.11 -174 0 0 40 5 12 12 38 21.3 15 280 -40 39 50 51 40 19 33 39 41 50 40 28 35 -0.11 -173 0 0 39 55 27 12 38 23.4 15 281 -40 39 41 5 40 9 50 39 32 2 40 18 53 -0.11 -172 0 0 39 45 12 12 38 25.3 14 281 -40 39 30 48 39 59 37 39 21 44 40 8 41 -0.11 -171 0 0 39 34 27 12 38 27.2 13 282 -39 39 20 0 39 48 53 39 10 55 39 57 59 -0.11 -170 0 0 39 23 11 12 38 29.0 12 283 -39 39 8 43 39 37 40 38 59 36 39 46 47 -0.12 -169 0 0 39 11 25 12 38 30.6 11 283 -39 38 56 54 39 25 56 38 47 46 39 35 4 -0.12 -168 0 0 38 59 7 12 38 32.2 11 284 -39 38 44 35 39 13 41 38 35 25 39 22 51 -0.12 -167 0 0 38 46 19 12 38 33.6 10 284 -39 38 31 44 39 0 55 38 22 33 39 10 7 -0.12 -166 0 0 38 33 0 12 38 34.9 9 285 -39 38 18 23 38 47 38 38 9 10 38 56 51 -0.12 -165 0 0 38 19 9 12 38 36.2 8 286 -38 38 4 29 38 33 50 37 55 15 38 43 5 -0.12 -164 0 0 38 4 47 12 38 37.3 7 286 -38 37 50 5 38 19 30 37 40 49 38 28 46 -0.13 -163 0 0 37 49 53 12 38 38.3 7 287 -38 37 35 8 38 4 39 37 25 51 38 13 57 -0.13 -162 0 0 37 34 27 12 38 39.2 6 288 -38 37 19 40 37 49 16 37 10 21 37 58 35 -0.13 -161 0 0 37 18 29 12 38 40.0 5 288 -37 37 3 39 37 33 20 36 54 18 37 42 42 -0.14 -160 0 0 37 1 59 12 38 40.6 4 289 -37 36 47 6 37 16 53 36 37 43 37 26 16 -0.15 -159 0 0 36 44 56 12 38 41.2 3 289 -37 36 30 0 36 59 53 36 20 36 37 9 18 -0.16 -158 0 0 36 27 21 12 38 41.6 2 290 -37 36 12 22 36 42 20 36 2 55 36 51 47 -0.18 -157 0 0 36 9 12 12 38 41.9 1 291 -36 35 54 10 36 24 15 35 44 42 36 33 44 -0.22 -156 0 0 35 50 31 12 38 42.1 1 291 -36 35 35 26 36 5 37 35 25 56 36 15 7 -0.39 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: TYC 1392-00864-1 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 41 21.7589 DE: +17 28 55.434 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 41 21.7587 DE: +17 28 55.435 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.8 * B mag [mag]: 10.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1585) Union asteroid class: approx. diameter [km]: 52 approx. diameter ["]: 0.032 distance from Earth [AU]: 2.24090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 date of fit: 2023 Apr 27 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): 0.022", 0.005", 82.5° remarks: * orbital elements for (1585)Union : Mean anomaly = 59.0681556267 deg Arg. of pericenter = 264.1451769342 deg Long. of node = 150.0771599738 deg Inclination = 26.1775515478 deg Eccentricity = 0.3087792542 Semimajor axis = 2.9286052975 AU Perihelion dist = 2.0243127378 AU Mag: H = 10.37, G = 0.15 Epoch of elements : MJD 60410.52035071 TDT (2024 Apr 10.5204) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Apr27,4.60,2024,4,10,12.488409,-0.051492,0.084025,5.392638,3.339938,0.005295,-0.001400,0.000000,0.000000 104.1297,17.3961,-7.03,8.24,False TYC 1392-00864-1,8.68937750,17.4820650,10.05,9.76,9.60,0.1,0,,8.71231436,17.3960826,5.56,5.26,0,0,0 1585,Union,15.31,51.691,2.2409,0,0,1.479,13.10,,2.8,0 0,58.9658,2024,4,10,264.1452,150.0772,26.1776,0.30878,2.92861,2.02431,10.37,5.0,0.15 1.315,0.0217,0.0050,83,0.0100,Known errors,1.03,0,-1,-1 20240410_0864-1,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org