IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 293-143978 event on 2023 Sep 22, 02:18 UT Visible from W USA, Mexico Summary ------- On 2023 Sep 22 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 13.7 mag star in the constellation Scorpius 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 0.80 mag to 13.79 mag (the magnitude of the asteroid) for at most 12.090 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 22, 02:13 - 2023 Sep 22, 02:22 * geocentric midpoint of event [JD]: 2460209.59599708 * magnitude of target star: 13.69 * magnitude drop [mag]: 0.80 * estimated maximum duration [s]: 12.090 * Moon: 42 % sunlit, 11° distance * Sun: 91° distance * rough path description: W USA, Mexico Additional comments ------------------- RUWE The occultation path -------------------- * approximate projected width [km]: 317 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.001", 91°) * approx speed of asteroid's shadow [km/s]: 15.3478 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 293-143978 by 94 Aurora on 2023 Sep 22 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 168 0 0 .. .. .... .. .. .. .. .. .. 31 3 39 .. .. .. 30 58 20 .. .. .. .... 169 0 0 32 9 41 2 14 11.5 1 129 51 30 24 49 .. .. .. 30 19 33 .. .. .. .... 170 0 0 31 30 38 2 14 11.8 2 129 51 29 46 58 33 19 57 29 41 46 33 25 45 -0.83 171 0 0 30 52 37 2 14 12.4 3 130 51 29 10 7 32 40 35 29 4 58 32 46 19 -1.02 172 0 0 30 15 40 2 14 13.1 4 130 51 28 34 16 32 2 20 28 29 10 32 7 59 -1.11 173 0 0 29 39 45 2 14 14.2 5 131 50 27 59 25 31 25 11 27 54 23 31 30 46 -1.17 174 0 0 29 4 54 2 14 15.4 6 131 50 27 25 35 30 49 9 27 20 35 30 54 40 -1.20 175 0 0 28 31 5 2 14 16.9 7 132 50 26 52 44 30 14 13 26 47 48 30 19 40 -1.23 176 0 0 27 58 20 2 14 18.6 8 132 49 26 20 55 29 40 24 26 16 1 29 45 47 -1.25 177 0 0 27 26 38 2 14 20.5 9 133 49 25 50 6 29 7 40 25 45 15 29 13 1 -1.26 178 0 0 26 55 59 2 14 22.7 10 133 48 25 20 18 28 36 3 25 15 29 28 41 20 -1.27 179 0 0 26 26 23 2 14 25.0 11 134 48 24 51 30 28 5 32 24 46 44 28 10 45 -1.28 -180 0 0 25 57 50 2 14 27.6 12 134 47 24 23 43 27 36 6 24 18 59 27 41 17 -1.29 -179 0 0 25 30 20 2 14 30.3 13 135 47 23 56 57 27 7 45 23 52 15 27 12 54 -1.30 -178 0 0 25 3 52 2 14 33.3 14 135 46 23 31 12 26 40 30 23 26 31 26 45 36 -1.31 -177 0 0 24 38 27 2 14 36.4 15 136 46 23 6 27 26 14 20 23 1 48 26 19 23 -1.31 -176 0 0 24 14 5 2 14 39.8 16 136 45 22 42 43 25 49 16 22 38 6 25 54 16 -1.32 -175 0 0 23 50 46 2 14 43.3 17 137 44 22 19 59 25 25 15 22 15 24 25 30 14 -1.32 -174 0 0 23 28 28 2 14 47.0 18 138 44 21 58 16 25 2 20 21 53 42 25 7 16 -1.33 -173 0 0 23 7 14 2 14 50.8 19 138 43 21 37 33 24 40 29 21 33 1 24 45 23 -1.33 -172 0 0 22 47 1 2 14 54.9 20 139 42 21 17 50 24 19 42 21 13 20 24 24 34 -1.34 -171 0 0 22 27 50 2 14 59.1 20 139 41 20 59 8 23 59 59 20 54 39 24 4 50 -1.34 -170 0 0 22 9 41 2 15 3.4 21 140 41 20 41 26 23 41 20 20 36 58 23 46 9 -1.34 -169 0 0 21 52 34 2 15 7.9 22 140 40 20 24 44 23 23 45 20 20 18 23 28 33 -1.35 -168 0 0 21 36 29 2 15 12.6 23 141 39 20 9 2 23 7 14 20 4 37 23 12 0 -1.35 -167 0 0 21 21 25 2 15 17.4 24 142 38 19 54 20 22 51 46 19 49 56 22 56 31 -1.35 -166 0 0 21 7 23 2 15 22.4 24 142 37 19 40 38 22 37 21 19 36 15 22 42 5 -1.35 -165 0 0 20 54 22 2 15 27.4 25 143 37 19 27 56 22 24 0 19 23 34 22 28 42 -1.36 -164 0 0 20 42 23 2 15 32.7 26 144 36 19 16 13 22 11 42 19 11 52 22 16 23 -1.36 -163 0 0 20 31 25 2 15 38.0 27 144 35 19 5 31 22 0 26 19 1 10 22 5 7 -1.36 -162 0 0 20 21 28 2 15 43.5 27 145 34 18 55 47 21 50 14 18 51 28 21 54 54 -1.36 -161 0 0 20 12 32 2 15 49.1 28 146 33 18 47 4 21 41 5 18 42 45 21 45 44 -1.36 -160 0 0 20 4 37 2 15 54.8 29 146 32 18 39 20 21 32 58 18 35 1 21 37 36 -1.37 -159 0 0 19 57 44 2 16 0.6 29 147 31 18 32 36 21 25 54 18 28 17 21 30 32 -1.37 -158 0 0 19 51 51 2 16 6.5 30 148 30 18 26 51 21 19 53 18 22 33 21 24 30 -1.37 -157 0 0 19 47 0 2 16 12.5 30 149 29 18 22 5 21 14 54 18 17 48 21 19 31 -1.37 -156 0 0 19 43 9 2 16 18.7 31 150 28 18 18 20 21 10 59 18 14 2 21 15 35 -1.37 -155 0 0 19 40 19 2 16 24.9 32 150 27 18 15 34 21 8 6 18 11 16 21 12 42 -1.37 -154 0 0 19 38 31 2 16 31.2 32 151 27 18 13 47 21 6 15 18 9 30 21 10 52 -1.38 -153 0 0 19 37 44 2 16 37.6 32 152 26 18 13 0 21 5 28 18 8 43 21 10 4 -1.38 -152 0 0 19 37 58 2 16 44.1 33 153 25 18 13 13 21 5 43 18 8 56 21 10 19 -1.38 -151 0 0 19 39 13 2 16 50.6 33 154 24 18 14 25 21 7 1 18 10 8 21 11 37 -1.38 -150 0 0 19 41 29 2 16 57.3 34 155 23 18 16 38 21 9 22 18 12 20 21 13 59 -1.38 -149 0 0 19 44 47 2 17 4.0 34 156 22 18 19 50 21 12 46 18 15 32 21 17 23 -1.38 -148 0 0 19 49 6 2 17 10.8 34 157 21 18 24 2 21 17 13 18 19 44 21 21 50 -1.38 -147 0 0 19 54 27 2 17 17.6 35 158 20 18 29 14 21 22 43 18 24 56 21 27 21 -1.38 -146 0 0 20 0 50 2 17 24.5 35 159 19 18 35 27 21 29 17 18 31 8 21 33 56 -1.38 -145 0 0 20 8 14 2 17 31.4 35 160 18 18 42 39 21 36 54 18 38 20 21 41 34 -1.38 -144 0 0 20 16 41 2 17 38.4 35 161 17 18 50 53 21 45 36 18 46 32 21 50 16 -1.38 -143 0 0 20 26 9 2 17 45.4 36 162 16 19 0 7 21 55 21 18 55 46 22 0 2 -1.38 -142 0 0 20 36 40 2 17 52.5 36 163 15 19 10 21 22 6 10 19 5 59 22 10 52 -1.38 -141 0 0 20 48 14 2 17 59.6 36 164 14 19 21 37 22 18 3 19 17 14 22 22 46 -1.39 -140 0 0 21 0 50 2 18 6.7 36 165 13 19 33 53 22 31 1 19 29 30 22 35 46 -1.39 -139 0 0 21 14 29 2 18 13.9 36 166 12 19 47 11 22 45 4 19 42 47 22 49 50 -1.39 -138 0 0 21 29 12 2 18 21.1 36 167 11 20 1 31 23 0 12 19 57 5 23 4 59 -1.39 -137 0 0 21 44 57 2 18 28.3 36 168 10 20 16 52 23 16 26 20 12 25 23 21 14 -1.39 -136 0 0 22 1 47 2 18 35.5 36 169 9 20 33 15 23 33 44 20 28 46 23 38 35 -1.39 -135 0 0 22 19 40 2 18 42.7 36 171 8 20 50 40 23 52 9 20 46 10 23 57 1 -1.39 -134 0 0 22 38 37 2 18 49.9 35 172 7 21 9 7 24 11 40 21 4 36 24 16 34 -1.39 -133 0 0 22 58 38 2 18 57.1 35 173 6 21 28 36 24 32 17 21 24 4 24 37 13 -1.39 -132 0 0 23 19 44 2 19 4.3 35 174 5 21 49 8 24 54 1 21 44 34 24 58 59 -1.39 -131 0 0 23 41 55 2 19 11.5 35 175 4 22 10 43 25 16 52 22 6 7 25 21 52 -1.39 -130 0 0 24 5 11 2 19 18.6 34 176 3 22 33 21 25 40 51 22 28 43 25 45 53 -1.39 -129 0 0 24 29 32 2 19 25.7 34 177 2 22 57 2 26 5 57 22 52 23 26 11 2 -1.39 -128 0 0 24 54 58 2 19 32.8 34 178 1 23 21 47 26 32 11 23 17 5 26 37 18 -1.39 -127 0 0 25 21 30 2 19 39.8 33 179 0 23 47 35 26 59 33 23 42 51 27 4 43 -1.39 -126 0 0 25 49 8 2 19 46.8 33 180 0 24 14 26 27 28 4 24 9 40 27 33 17 -1.38 -125 0 0 26 17 52 2 19 53.7 32 181 -1 24 42 22 27 57 43 24 37 33 28 2 59 -1.38 -124 0 1 26 47 42 2 20 0.6 32 182 -2 25 11 21 28 28 32 25 6 30 28 33 51 -1.38 -123 0 1 27 18 39 2 20 7.4 31 183 -3 25 41 24 29 0 30 25 36 30 29 5 53 -1.38 -122 0 1 27 50 43 2 20 14.1 31 184 -4 26 12 31 29 33 38 26 7 35 29 39 4 -1.38 -121 0 1 28 23 53 2 20 20.7 30 185 -5 26 44 42 30 7 56 26 39 43 30 13 26 -1.38 -120 0 1 28 58 9 2 20 27.3 29 186 -6 27 17 58 30 43 24 27 12 56 30 48 58 -1.38 -119 0 1 29 33 33 2 20 33.7 29 187 -7 27 52 17 31 20 2 27 47 12 31 25 41 -1.38 -118 0 1 30 10 4 2 20 40.0 28 188 -7 28 27 41 31 57 52 28 22 32 32 3 34 -1.38 -117 0 1 30 47 42 2 20 46.2 27 189 -8 29 4 8 32 36 51 28 58 56 32 42 39 -1.38 -116 0 1 31 26 26 2 20 52.3 26 190 -9 29 41 39 33 17 2 29 36 24 33 22 55 -1.38 -115 0 1 32 6 18 2 20 58.2 26 191 -10 30 20 14 33 58 25 30 14 55 34 4 22 -1.38 -114 0 1 32 47 16 2 21 4.0 25 192 -11 30 59 52 34 40 58 30 54 30 34 47 1 -1.38 -113 0 1 33 29 22 2 21 9.6 24 193 -11 31 40 34 35 24 43 31 35 7 35 30 51 -1.38 -112 0 1 34 12 33 2 21 15.1 23 194 -12 32 22 18 36 9 39 32 16 47 36 15 54 -1.38 -111 0 1 34 56 51 2 21 20.3 22 194 -13 33 5 4 36 55 47 32 59 29 37 2 8 -1.38 -110 0 1 35 42 15 2 21 25.4 21 195 -14 33 48 52 37 43 7 33 43 13 37 49 34 -1.38 -109 0 1 36 28 44 2 21 30.4 20 196 -14 34 33 42 38 31 38 34 27 58 38 38 12 -1.38 -108 0 1 37 16 19 2 21 35.1 19 197 -15 35 19 32 39 21 20 35 13 43 39 28 2 -1.39 -107 0 1 38 4 58 2 21 39.6 18 198 -15 36 6 22 40 12 14 36 0 28 40 19 3 -1.39 -106 0 1 38 54 41 2 21 43.9 17 198 -16 36 54 12 41 4 18 36 48 12 41 11 16 -1.39 -105 0 1 39 45 28 2 21 47.9 16 199 -17 37 43 0 41 57 35 37 36 55 42 4 41 -1.39 -104 0 1 40 37 18 2 21 51.7 15 200 -17 38 32 45 42 52 1 38 26 34 42 59 17 -1.39 -103 0 1 41 30 9 2 21 55.3 14 201 -18 39 23 26 43 47 39 39 17 10 43 55 4 -1.39 -102 0 1 42 24 1 2 21 58.6 13 202 -18 40 15 3 44 44 26 40 8 40 44 52 2 -1.40 -101 0 1 43 18 54 2 22 1.7 12 202 -18 41 7 32 45 42 24 41 1 3 45 50 11 -1.40 -100 0 1 44 14 45 2 22 4.5 10 203 -19 42 0 54 46 41 31 41 54 18 46 49 30 -1.41 - 99 0 1 45 11 33 2 22 7.0 9 204 -19 42 55 7 47 41 47 42 48 24 47 49 58 -1.41 - 98 0 1 46 9 17 2 22 9.2 8 205 -19 43 50 9 48 43 11 43 43 18 48 51 37 -1.42 - 97 0 1 47 7 57 2 22 11.1 7 205 -20 44 45 57 49 45 45 44 38 59 49 54 25 -1.43 - 96 0 1 48 7 29 2 22 12.7 6 206 -20 45 42 31 50 49 26 45 35 25 50 58 22 -1.45 - 95 0 1 49 7 53 2 22 14.1 5 207 -20 46 39 47 51 54 15 46 32 33 52 3 27 -1.47 - 94 0 1 50 9 6 2 22 15.1 3 208 -20 47 37 44 53 0 11 47 30 21 53 9 42 -1.51 - 93 0 1 51 11 6 2 22 15.8 2 208 -20 48 36 19 .. .. .. 48 28 47 .. .. .. -1.59 - 92 0 1 52 13 52 2 22 16.1 1 209 -20 49 35 29 .. .. .. 49 27 48 .. .. .. -1.88 - 91 0 0 .. .. .... .. .. .. .. .. .. 50 35 11 .. .. .. 50 27 21 .. .. .. .... - 90 0 0 .. .. .... .. .. .. .. .. .. 51 35 22 .. .. .. 51 27 22 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 26.9 Data for the target star ------------------------ * name: UCAC4 293-143978 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 56 00.0345 DE: -31 34 09.930 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 56 00.0344 DE: -31 34 09.930 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 13.7 * B mag [mag]: 13.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.080 distance from Earth [AU]: 3.19380 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 date of fit: 2023 Aug 25 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", 91.4° remarks: * orbital elements for (94)Aurora : Mean anomaly = 231.7115958767 deg Arg. of pericenter = 60.2826648298 deg Long. of node = 2.5457385068 deg Inclination = 7.9708623080 deg Eccentricity = 0.0954985005 Semimajor axis = 3.1552718449 AU Perihelion dist = 2.8539481151 AU Mag: H = 7.75, G = 0.15 Epoch of elements : MJD 60209.09598388 TDT (2023 Sep 22.0960) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Aug25,12.09,2023,9,22,2.303930,-0.211250,0.782368,8.363948,2.255494,0.005823,-0.000019,0.000000,0.000000 -125.8712,-31.5745,143.68,0.46,False UCAC4 293-143978,17.93334293,-31.5694249,13.92,13.69,13.57,0.0,0,,17.95884522,-31.5744798,0.80,0.64,0,0,0 94,Aurora,13.79,185.619,3.1938,0,0,1.803,6.21,,10.4,0 0,231.6947,2023,9,22,60.2827,2.5457,7.9709,0.09550,3.15527,2.85395,7.72,5.0,0.15 1.026,0.0057,0.0013,91,0.0058,Known errors,2.19,0,-1,-1 20230922_143978,60182.92 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 22:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org