IOTA/IOTA-ES occultation update for (336) Lacadiera / UCAC4 345-073642 event on 2023 Apr 03, 10:52 UT Visible from W USA, Mexico Summary ------- On 2023 Apr 03 UT, the 69.7 km diameter asteroid (336) Lacadiera will occult a 11.8 mag star in the constellation Libra for observers along a path across W USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.39 mag to 12.80 mag (the magnitude of the asteroid) for at most 20.770 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 Apr 03, 10:31 - 2023 Apr 03, 11:12 * geocentric midpoint of event [JD]: 2460037.95314054 * magnitude of target star: 11.77 * magnitude drop [mag]: 1.39 * estimated maximum duration [s]: 20.770 * Moon: 93 % sunlit, 68° distance * Sun: 144° distance * rough path description: W USA, Mexico The occultation path -------------------- * approximate projected width [km]: 113 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.003", 99°) * approx speed of asteroid's shadow [km/s]: 3.3558 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-073642 by 336 Lacadiera on 2023 Apr 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 -142 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 68 23 42 .... -141 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 66 50 33 .. .. .. 66 3 31 .... -140 0 0 67 50 2 11 11 55.3 1 174 -14 .. .. .. 64 38 35 .. .. .. 63 59 22 .... -139 0 0 65 14 24 11 11 49.9 4 175 -17 .. .. .. 62 39 36 .. .. .. 62 5 28 -0.81 -138 0 0 63 2 26 11 11 40.3 6 176 -18 66 2 21 60 49 27 67 7 8 60 18 57 -1.08 -137 0 0 61 3 55 11 11 27.5 8 176 -20 63 30 51 59 5 57 64 17 32 58 38 12 -1.18 -136 0 0 59 14 33 11 11 12.3 10 177 -21 61 21 27 57 27 44 61 59 36 57 2 11 -1.23 -135 0 0 57 32 2 11 10 54.9 11 178 -22 59 25 1 55 53 56 59 57 57 55 30 10 -1.26 -134 0 0 55 54 59 11 10 35.8 13 179 -23 57 37 35 54 23 56 58 6 53 54 1 39 -1.29 -133 0 0 54 22 28 11 10 15.0 15 180 -24 55 56 55 52 57 16 56 23 30 52 36 15 -1.30 -132 0 0 52 53 50 11 9 52.8 16 181 -25 54 21 42 51 33 35 54 46 10 51 13 41 -1.32 -131 0 0 51 28 38 11 9 29.3 17 182 -26 52 51 0 50 12 38 53 13 45 49 53 42 -1.32 -130 0 0 50 6 29 11 9 4.5 19 183 -26 51 24 12 48 54 11 51 45 31 48 36 6 -1.33 -129 0 0 48 47 6 11 8 38.8 20 183 -27 50 0 49 47 38 4 50 20 56 47 20 44 -1.34 -128 0 0 47 30 16 11 8 12.0 21 184 -27 48 40 29 46 24 8 48 59 34 46 7 28 -1.34 -127 0 0 46 15 48 11 7 44.4 23 185 -28 47 22 56 45 12 15 47 41 7 44 56 12 -1.34 -126 0 0 45 3 31 11 7 15.9 24 186 -28 46 7 56 44 2 19 46 25 19 43 46 49 -1.34 -125 0 0 43 53 20 11 6 46.8 25 187 -29 44 55 17 42 54 13 45 11 58 42 39 14 -1.34 -124 0 0 42 45 5 11 6 16.9 26 188 -29 43 44 50 41 47 54 44 0 53 41 33 23 -1.34 -123 0 0 41 38 42 11 5 46.5 27 189 -29 42 36 27 40 43 17 42 51 56 40 29 11 -1.34 -122 0 0 40 34 6 11 5 15.5 28 190 -29 41 30 2 39 40 18 41 45 0 39 26 35 -1.34 -121 0 0 39 31 12 11 4 44.1 29 191 -29 40 25 28 38 38 53 40 39 58 38 25 32 -1.34 -120 0 0 38 29 57 11 4 12.2 30 192 -30 39 22 41 37 39 0 39 36 45 37 25 59 -1.34 -119 0 0 37 30 16 11 3 40.0 30 193 -30 38 21 35 36 40 35 38 35 16 36 27 53 -1.34 -118 0 0 36 32 6 11 3 7.4 31 194 -29 37 22 8 35 43 36 37 35 27 35 31 12 -1.33 -117 0 0 35 35 25 11 2 34.5 32 195 -29 36 24 14 34 48 1 36 37 13 34 35 53 -1.33 -116 0 0 34 40 10 11 2 1.4 33 196 -29 35 27 52 33 53 48 35 40 32 33 41 55 -1.33 -115 0 0 33 46 18 11 1 28.0 33 198 -29 34 32 57 33 0 54 34 45 20 32 49 15 -1.32 -114 0 0 32 53 47 11 0 54.5 34 199 -29 33 39 28 32 9 17 33 51 34 31 57 51 -1.32 -113 0 0 32 2 35 11 0 20.8 34 200 -29 32 47 21 31 18 56 32 59 13 31 7 43 -1.32 -112 0 0 31 12 41 10 59 47.1 35 201 -28 31 56 35 30 29 49 32 8 13 30 18 48 -1.31 -111 0 0 30 24 2 10 59 13.3 35 202 -28 31 7 8 29 41 55 31 18 33 29 31 5 -1.31 -110 0 0 29 36 37 10 58 39.4 36 203 -28 30 18 58 28 55 12 30 30 10 28 44 33 -1.31 -109 0 0 28 50 24 10 58 5.5 36 204 -27 29 32 2 28 9 39 29 43 3 27 59 10 -1.30 -108 0 0 28 5 22 10 57 31.6 37 205 -27 28 46 20 27 25 15 28 57 10 27 14 55 -1.30 -107 0 0 27 21 30 10 56 57.8 37 207 -27 28 1 50 26 41 58 28 12 30 26 31 47 -1.30 -106 0 0 26 38 47 10 56 24.0 37 208 -26 27 18 31 25 59 48 27 29 1 25 49 46 -1.29 -105 0 0 25 57 11 10 55 50.3 37 209 -26 26 36 21 25 18 44 26 46 42 25 8 50 -1.29 -104 0 0 25 16 41 10 55 16.7 38 210 -25 25 55 19 24 38 44 26 5 31 24 28 58 -1.29 -103 0 0 24 37 16 10 54 43.2 38 211 -25 25 15 24 23 59 48 25 25 28 23 50 9 -1.29 -102 0 0 23 58 55 10 54 9.8 38 212 -24 24 36 35 23 21 55 24 46 31 23 12 22 -1.28 -101 0 0 23 21 38 10 53 36.7 38 213 -24 23 58 50 22 45 4 24 8 39 22 35 37 -1.28 -100 0 0 22 45 24 10 53 3.7 38 215 -23 23 22 10 22 9 14 23 31 52 21 59 54 -1.28 - 99 0 0 22 10 11 10 52 30.9 38 216 -22 22 46 33 21 34 24 22 56 8 21 25 10 -1.27 - 98 0 0 21 36 0 10 51 58.3 38 217 -22 22 11 58 21 0 35 22 21 27 20 51 26 -1.27 - 97 0 0 21 2 49 10 51 26.0 38 218 -21 21 38 25 20 27 45 21 47 48 20 18 41 -1.27 - 96 0 0 20 30 37 10 50 53.9 38 219 -20 21 5 53 19 55 53 21 15 10 19 46 55 -1.27 - 95 0 0 19 59 25 10 50 22.0 38 220 -20 20 34 20 19 24 59 20 43 32 19 16 6 -1.27 - 94 0 0 19 29 10 10 49 50.5 38 221 -19 20 3 47 18 55 3 20 12 54 18 46 14 -1.26 - 93 0 0 18 59 54 10 49 19.2 37 222 -18 19 34 13 18 26 4 19 43 15 18 17 19 -1.26 - 92 0 0 18 31 35 10 48 48.2 37 223 -18 19 5 37 17 58 2 19 14 35 17 49 21 -1.26 - 91 0 0 18 4 13 10 48 17.5 37 224 -17 18 37 59 17 30 55 18 46 52 17 22 18 -1.26 - 90 0 0 17 37 48 10 47 47.1 37 225 -16 18 11 19 17 4 44 18 20 8 16 56 11 -1.26 - 89 0 0 17 12 19 10 47 17.1 36 226 -16 17 45 35 16 39 29 17 54 20 16 31 0 -1.26 - 88 0 0 16 47 46 10 46 47.4 36 227 -15 17 20 48 16 15 9 17 29 30 16 6 43 -1.26 - 87 0 0 16 24 8 10 46 18.1 36 228 -14 16 56 58 15 51 43 17 5 36 15 43 20 -1.26 - 86 0 0 16 1 25 10 45 49.2 35 228 -13 16 34 3 15 29 12 16 42 37 15 20 52 -1.26 - 85 0 0 15 39 36 10 45 20.6 35 229 -12 16 12 3 15 7 35 16 20 35 14 59 17 -1.26 - 84 0 0 15 18 43 10 44 52.4 35 230 -12 15 50 59 14 46 51 15 59 27 14 38 37 -1.25 - 83 0 0 14 58 44 10 44 24.6 34 231 -11 15 30 49 14 27 2 15 39 15 14 18 49 -1.25 - 82 0 0 14 39 38 10 43 57.1 34 232 -10 15 11 35 14 8 5 15 19 58 13 59 56 -1.26 - 81 0 0 14 21 27 10 43 30.2 33 232 -9 14 53 14 13 50 3 15 1 36 13 41 55 -1.26 - 80 0 0 14 4 9 10 43 3.6 33 233 -8 14 35 49 13 32 53 14 44 8 13 24 47 -1.26 - 79 0 0 13 47 46 10 42 37.4 32 234 -8 14 19 17 13 16 36 14 27 34 13 8 32 -1.26 - 78 0 0 13 32 15 10 42 11.7 32 234 -7 14 3 40 13 1 12 14 11 55 12 53 10 -1.26 - 77 0 0 13 17 38 10 41 46.5 31 235 -6 13 48 56 12 46 42 13 57 10 12 38 41 -1.26 - 76 0 0 13 3 54 10 41 21.6 30 236 -5 13 35 7 12 33 4 13 43 19 12 25 4 -1.26 - 75 0 0 12 51 4 10 40 57.3 30 236 -4 13 22 12 12 20 18 13 30 22 12 12 21 -1.26 - 74 0 0 12 39 7 10 40 33.4 29 237 -3 13 10 10 12 8 26 13 18 19 12 0 29 -1.26 - 73 0 0 12 28 4 10 40 10.0 29 237 -3 12 59 2 11 57 26 13 7 11 11 49 31 -1.26 - 72 0 0 12 17 54 10 39 47.1 28 238 -2 12 48 49 11 47 20 12 56 56 11 39 25 -1.27 - 71 0 0 12 8 37 10 39 24.7 27 238 -1 12 39 29 11 38 6 12 47 36 11 30 12 -1.27 - 70 0 0 12 0 14 10 39 2.8 27 239 0 12 31 4 11 29 46 12 39 10 11 21 52 -1.27 - 69 0 0 11 52 45 10 38 41.4 26 239 1 12 23 33 11 22 18 12 31 38 11 14 26 -1.27 - 68 0 0 11 46 10 10 38 20.5 25 240 2 12 16 57 11 15 45 12 25 2 11 7 52 -1.28 - 67 0 0 11 40 30 10 38 0.2 24 240 3 12 11 15 11 10 5 12 19 20 11 2 13 -1.28 - 66 0 0 11 35 43 10 37 40.4 24 241 4 12 6 29 11 5 19 12 14 33 10 57 27 -1.28 - 65 0 0 11 31 52 10 37 21.2 23 241 4 12 2 37 11 1 27 12 10 42 10 53 35 -1.28 - 64 0 0 11 28 55 10 37 2.5 22 241 5 11 59 42 10 58 30 12 7 46 10 50 37 -1.29 - 63 0 0 11 26 54 10 36 44.4 21 242 6 11 57 42 10 56 28 12 5 47 10 48 35 -1.29 - 62 0 0 11 25 49 10 36 26.9 21 242 7 11 56 39 10 55 21 12 4 45 10 47 27 -1.30 - 61 0 0 11 25 40 10 36 10.0 20 242 8 11 56 32 10 55 9 12 4 39 10 47 15 -1.30 - 60 0 0 11 26 28 10 35 53.7 19 243 9 11 57 23 10 55 54 12 5 31 10 47 59 -1.30 - 59 0 0 11 28 13 10 35 38.0 18 243 10 11 59 12 10 57 35 12 7 20 10 49 39 -1.31 - 58 0 0 11 30 55 10 35 22.9 17 243 11 12 1 58 11 0 13 12 10 8 10 52 16 -1.31 - 57 0 0 11 34 36 10 35 8.5 16 244 12 12 5 44 11 3 49 12 13 55 10 55 51 -1.32 - 56 0 0 11 39 15 10 34 54.8 16 244 13 12 10 29 11 8 23 12 18 42 11 0 23 -1.32 - 55 0 0 11 44 54 10 34 41.7 15 244 14 12 16 15 11 13 56 12 24 29 11 5 55 -1.33 - 54 0 0 11 51 33 10 34 29.3 14 244 15 12 23 1 11 20 28 12 31 17 11 12 25 -1.33 - 53 0 0 11 59 14 10 34 17.6 13 245 15 12 30 49 11 28 1 12 39 7 11 19 56 -1.34 - 52 0 0 12 7 56 10 34 6.6 12 245 16 12 39 39 11 36 35 12 48 0 11 28 28 -1.35 - 51 0 0 12 17 41 10 33 56.4 11 245 17 12 49 33 11 46 11 12 57 56 11 38 2 -1.36 - 50 0 0 12 28 29 10 33 46.9 10 245 18 13 0 32 11 56 50 13 8 57 11 48 38 -1.36 - 49 0 0 12 40 22 10 33 38.1 9 246 19 13 12 36 12 8 32 13 21 4 12 0 18 -1.37 - 48 0 0 12 53 20 10 33 30.2 8 246 20 13 25 46 12 21 20 13 34 17 12 13 3 -1.38 - 47 0 0 13 7 26 10 33 23.1 7 246 21 13 40 4 12 35 13 13 48 38 12 26 53 -1.40 - 46 0 0 13 22 39 10 33 16.8 6 246 22 13 55 30 12 50 13 14 4 9 12 41 50 -1.41 - 45 0 0 13 39 1 10 33 11.4 5 247 23 14 12 7 13 6 22 14 20 49 12 57 55 -1.43 - 44 0 0 13 56 34 10 33 6.8 4 247 24 14 29 56 13 23 40 14 38 42 13 15 9 -1.46 - 43 0 0 14 15 19 10 33 3.2 3 247 25 14 48 57 13 42 9 14 57 48 13 33 34 -1.50 - 42 0 0 14 35 17 10 33 0.4 2 247 26 15 9 13 14 1 50 15 18 8 13 53 11 -1.57 - 41 0 0 14 56 30 10 32 58.7 1 248 27 15 30 45 14 22 45 15 39 45 14 14 2 -1.73 - 40 0 0 15 19 0 10 32 57.9 0 248 28 15 53 34 14 44 56 16 2 40 14 36 7 -2.91 Uncertainty in time = +/- 6 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 345-073642 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 03 21.2375 DE: -21 05 09.527 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 03 21.2375 DE: -21 05 09.527 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (336) Lacadiera asteroid class: approx. diameter [km]: 70 approx. diameter ["]: 0.079 distance from Earth [AU]: 1.22060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 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): 0.023", 0.003", 99.356° remarks: * orbital elements for (336)Lacadiera : Mean anomaly = 315.4024625966 deg Arg. of pericenter = 30.9438983544 deg Long. of node = 234.9858976261 deg Inclination = 5.6518239271 deg Eccentricity = 0.0953251425 Semimajor axis = 2.2519587262 AU Perihelion dist = 2.0372904398 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 60037.45326389 TDT (2023 Apr 03.4533) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232023Feb07,20.77,2023,4,3,10.875373,0.455620,0.641222,-1.544099,1.096994,-0.002959,0.001135,0.000001,0.000000 -128.4719,-21.1778,17.71,5.30,False UCAC4 345-073642,15.05589929,-21.0859798,0.00,11.77,0.00,0.0,0,,15.07824438,-21.1777776,1.39,0.00,0,0,0 336,Lacadiera,12.80,69.7,1.2206,0,0,-0.796,7.91,,3.6,0 0,315.2703,2023,4,3,30.9439,234.9859,5.6518,0.09533,2.25196,2.03729,9.87,5.0,0.15 1.130,0.0227,0.0028,99,0.0103,Known errors,-1.00,-1,-1,-1 20230403_073642,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org