IOTA/IOTA-ES occultation update for (246) Asporina / UCAC4 391-094961 event on 2023 Sep 28, 04:37 UT Visible from W USA Summary ------- On 2023 Sep 28 UT, the 57.1 km diameter asteroid (246) Asporina will occult a 10.6 mag star in the constellation Scutum for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.74 mag to 13.27 mag (the magnitude of the asteroid) for at most 3.090 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 28, 04:34 - 2023 Sep 28, 04:40 * geocentric midpoint of event [JD]: 2460215.69289742 * magnitude of target star: 10.62 * magnitude drop [mag]: 2.74 * estimated maximum duration [s]: 3.090 * Moon: 97 % sunlit, 68° distance * Sun: 95° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 112 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 93°) * approx speed of asteroid's shadow [km/s]: 18.4700 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 391-094961 by 246 Asporina on 2023 Sep 28 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 171 0 0 .. .. .... .. .. .. .. .. .. 75 52 56 .. .. .. 75 43 48 .. .. .. .... 172 0 0 .. .. .... .. .. .. .. .. .. 75 29 29 .. .. .. 75 20 19 .. .. .. .... 172 59 59 76 2 59 4 34 52.6 0 150 4 75 5 13 .. .. .. 74 56 1 .. .. .. .... 173 59 59 75 38 9 4 34 52.6 1 151 4 74 40 9 .. .. .. 74 30 54 .. .. .. -0.84 174 59 59 75 12 27 4 34 52.7 1 151 4 74 14 15 76 14 12 74 4 58 76 24 45 -1.18 175 59 59 74 45 53 4 34 52.9 2 152 4 73 47 32 75 47 49 73 38 14 75 58 24 -1.32 176 59 59 74 18 27 4 34 53.1 2 153 4 73 20 0 75 20 30 73 10 41 75 31 7 -1.40 177 59 59 73 50 10 4 34 53.4 3 154 4 72 51 39 74 52 17 72 42 20 75 2 54 -1.46 178 59 59 73 21 1 4 34 53.7 3 155 4 72 22 30 74 23 8 72 13 11 74 33 46 -1.49 -180 0 1 72 51 2 4 34 54.1 4 156 4 71 52 34 73 53 6 71 43 15 74 3 43 -1.52 -179 0 1 72 20 14 4 34 54.7 5 157 4 71 21 51 73 22 11 71 12 32 73 32 46 -1.54 -178 0 1 71 48 37 4 34 55.3 5 158 3 70 50 22 72 50 24 70 41 5 73 0 57 -1.56 -177 0 1 71 16 13 4 34 56.0 6 159 3 70 18 9 72 17 46 70 8 54 72 28 17 -1.57 -176 0 1 70 43 3 4 34 56.8 6 160 3 69 45 14 71 44 20 69 36 0 71 54 48 -1.58 -175 0 1 70 9 10 4 34 57.7 7 161 3 69 11 37 71 10 7 69 2 26 71 20 31 -1.59 -174 0 1 69 34 34 4 34 58.7 8 162 3 68 37 20 70 35 9 68 28 12 70 45 29 -1.60 -173 0 1 68 59 19 4 34 59.9 8 163 2 68 2 26 69 59 29 67 53 21 70 9 44 -1.60 -172 0 1 68 23 26 4 35 1.1 9 164 2 67 26 56 69 23 8 67 17 55 69 33 19 -1.61 -171 0 1 67 46 58 4 35 2.5 10 165 2 66 50 53 68 46 10 66 41 55 68 56 15 -1.61 -170 0 1 67 9 57 4 35 4.0 10 166 2 66 14 19 68 8 37 66 5 25 68 18 36 -1.62 -169 0 1 66 32 25 4 35 5.6 11 167 1 65 37 15 67 30 32 65 28 26 67 40 25 -1.62 -168 0 1 65 54 25 4 35 7.4 12 168 1 64 59 46 66 51 57 64 51 1 67 1 43 -1.63 -167 0 1 65 16 0 4 35 9.3 13 169 1 64 21 52 66 12 55 64 13 12 66 22 35 -1.63 -166 0 1 64 37 12 4 35 11.4 13 170 0 63 43 37 65 33 30 63 35 2 65 43 3 -1.63 -165 0 1 63 58 5 4 35 13.6 14 171 0 63 5 3 64 53 44 62 56 33 65 3 10 -1.64 -164 0 1 63 18 41 4 35 15.9 15 172 0 62 26 12 64 13 40 62 17 47 64 22 59 -1.64 -163 0 1 62 39 2 4 35 18.4 15 173 -1 61 47 8 63 33 21 61 38 48 63 42 33 -1.64 -162 0 1 61 59 11 4 35 21.1 16 174 -1 61 7 52 62 52 50 60 59 38 63 1 55 -1.64 -161 0 1 61 19 11 4 35 23.8 17 175 -2 60 28 28 62 12 10 60 20 19 62 21 7 -1.65 -160 0 1 60 39 5 4 35 26.8 18 176 -2 59 48 57 61 31 23 59 40 54 61 40 13 -1.65 -159 0 1 59 58 55 4 35 29.8 18 177 -3 59 9 23 60 50 32 59 1 25 60 59 15 -1.65 -158 0 1 59 18 43 4 35 33.0 19 178 -3 58 29 47 60 9 40 58 21 55 60 18 16 -1.65 -157 0 1 58 38 33 4 35 36.4 20 179 -4 57 50 12 59 28 50 57 42 25 59 37 19 -1.65 -156 0 1 57 58 26 4 35 39.8 20 180 -4 57 10 41 58 48 3 57 3 0 58 56 25 -1.66 -155 0 1 57 18 26 4 35 43.4 21 181 -5 56 31 16 58 7 23 56 23 39 58 15 38 -1.66 -154 0 1 56 38 33 4 35 47.2 22 182 -6 55 51 58 57 26 52 55 44 27 57 35 0 -1.66 -153 0 1 55 58 51 4 35 51.0 22 183 -6 55 12 50 56 46 31 55 5 24 56 54 33 -1.66 -152 0 1 55 19 21 4 35 55.0 23 184 -7 54 33 54 56 6 25 54 26 33 56 14 19 -1.66 -151 0 1 54 40 6 4 35 59.1 23 186 -7 53 55 12 55 26 32 53 47 56 55 34 20 -1.67 -150 0 1 54 1 7 4 36 3.4 24 187 -8 53 16 46 54 46 57 53 9 36 54 54 39 -1.67 -149 0 1 53 22 27 4 36 7.7 25 188 -9 52 38 37 54 7 41 52 31 32 54 15 17 -1.67 -148 0 1 52 44 6 4 36 12.1 25 189 -10 52 0 49 53 28 46 51 53 49 53 36 16 -1.67 -147 0 1 52 6 8 4 36 16.7 26 190 -10 51 23 21 52 50 14 51 16 26 52 57 38 -1.67 -146 0 1 51 28 33 4 36 21.3 26 191 -11 50 46 17 52 12 7 50 39 26 52 19 24 -1.68 -145 0 1 50 51 24 4 36 26.0 27 192 -12 50 9 37 51 34 25 50 2 51 51 41 37 -1.68 -144 0 1 50 14 41 4 36 30.8 27 194 -13 49 33 22 50 57 10 49 26 41 51 4 17 -1.68 -143 0 1 49 38 26 4 36 35.7 28 195 -13 48 57 36 50 20 25 48 50 59 50 27 26 -1.68 -142 0 1 49 2 40 4 36 40.6 28 196 -14 48 22 18 49 44 9 48 15 45 49 51 6 -1.68 -141 0 1 48 27 26 4 36 45.6 28 197 -15 47 47 29 49 8 26 47 41 1 49 15 17 -1.68 -140 0 1 47 52 43 4 36 50.7 29 198 -16 47 13 12 48 33 15 47 6 48 48 40 1 -1.69 -139 0 1 47 18 33 4 36 55.8 29 200 -17 46 39 28 47 58 37 46 33 7 48 5 19 -1.69 -138 0 1 46 44 57 4 37 1.0 29 201 -17 46 6 16 47 24 35 46 0 0 47 31 13 -1.69 -137 0 1 46 11 56 4 37 6.2 30 202 -18 45 33 40 46 51 9 45 27 27 46 57 42 -1.69 -136 0 1 45 39 32 4 37 11.5 30 203 -19 45 1 38 46 18 19 44 55 29 46 24 48 -1.69 -135 0 1 45 7 44 4 37 16.8 30 205 -20 44 30 13 45 46 8 44 24 7 45 52 32 -1.69 -134 0 1 44 36 34 4 37 22.1 30 206 -21 43 59 25 45 14 35 43 53 23 45 20 55 -1.69 -133 0 1 44 6 3 4 37 27.4 30 207 -22 43 29 15 44 43 41 43 23 16 44 49 58 -1.70 -132 0 1 43 36 11 4 37 32.7 30 208 -22 42 59 44 44 13 28 42 53 48 44 19 40 -1.70 -131 0 1 43 7 0 4 37 38.1 30 209 -23 42 30 52 43 43 55 42 24 59 43 50 4 -1.70 -130 0 1 42 38 29 4 37 43.4 30 211 -24 42 2 40 43 15 4 41 56 51 43 21 9 -1.70 -129 0 1 42 10 39 4 37 48.8 30 212 -25 41 35 9 42 46 54 41 29 22 42 52 57 -1.70 -128 0 1 41 43 32 4 37 54.1 30 213 -26 41 8 19 42 19 28 41 2 35 42 25 27 -1.70 -127 0 1 41 17 6 4 37 59.4 30 214 -27 40 42 11 41 52 44 40 36 30 41 58 40 -1.70 -126 0 1 40 51 24 4 38 4.7 30 215 -28 40 16 45 41 26 44 40 11 7 41 32 37 -1.71 -125 0 1 40 26 25 4 38 10.0 30 217 -29 39 52 2 41 1 28 39 46 26 41 7 18 -1.71 -124 0 1 40 2 9 4 38 15.2 30 218 -29 39 28 2 40 36 56 39 22 29 40 42 43 -1.71 -123 0 1 39 38 38 4 38 20.4 30 219 -30 39 4 45 40 13 9 38 59 14 40 18 53 -1.71 -122 0 1 39 15 51 4 38 25.6 30 220 -31 38 42 12 39 50 7 38 36 44 39 55 49 -1.71 -121 0 1 38 53 48 4 38 30.7 29 221 -32 38 20 24 39 27 50 38 14 57 39 33 29 -1.71 -120 0 1 38 32 31 4 38 35.8 29 222 -33 37 59 19 39 6 18 37 53 55 39 11 56 -1.71 -119 0 1 38 11 59 4 38 40.8 29 223 -34 37 39 0 38 45 33 37 33 37 38 51 8 -1.71 -118 0 1 37 52 12 4 38 45.8 28 224 -35 37 19 25 38 25 34 37 14 5 38 31 7 -1.72 -117 0 1 37 33 11 4 38 50.7 28 225 -36 37 0 36 38 6 21 36 55 17 38 11 52 -1.72 -116 0 1 37 14 56 4 38 55.5 28 226 -36 36 42 32 37 47 54 36 37 15 37 53 23 -1.72 -115 0 1 36 57 27 4 39 0.3 27 228 -37 36 25 13 37 30 14 36 19 58 37 35 41 -1.72 -114 0 1 36 40 44 4 39 5.0 27 228 -38 36 8 40 37 13 20 36 3 26 37 18 45 -1.72 -113 0 1 36 24 47 4 39 9.6 27 229 -39 35 52 52 36 57 13 35 47 40 37 2 37 -1.72 -112 0 1 36 9 36 4 39 14.1 26 230 -40 35 37 51 36 41 53 35 32 40 36 47 15 -1.72 -111 0 1 35 55 12 4 39 18.5 26 231 -41 35 23 35 36 27 20 35 18 26 36 32 41 -1.72 -110 0 1 35 41 34 4 39 22.9 25 232 -41 35 10 6 36 13 34 35 4 58 36 18 53 -1.72 -109 0 1 35 28 43 4 39 27.2 25 233 -42 34 57 22 36 0 35 34 52 15 36 5 53 -1.72 -108 0 1 35 16 39 4 39 31.3 24 234 -43 34 45 25 35 48 23 34 40 19 35 53 39 -1.72 -107 0 1 35 5 21 4 39 35.4 23 235 -44 34 34 13 35 36 58 34 29 9 35 42 13 -1.73 -106 0 1 34 54 50 4 39 39.4 23 236 -44 34 23 48 35 26 20 34 18 45 35 31 35 -1.73 -105 0 1 34 45 5 4 39 43.3 22 237 -45 34 14 10 35 16 30 34 9 7 35 21 43 -1.73 -104 0 1 34 36 7 4 39 47.0 22 237 -46 34 5 17 35 7 27 34 0 15 35 12 39 -1.73 -103 0 1 34 27 56 4 39 50.7 21 238 -47 33 57 11 34 59 10 33 52 10 35 4 22 -1.73 -102 0 1 34 20 32 4 39 54.2 20 239 -47 33 49 51 34 51 41 33 44 50 34 56 52 -1.73 -101 0 1 34 13 54 4 39 57.7 20 240 -48 33 43 17 34 44 59 33 38 17 34 50 9 -1.73 -100 0 1 34 8 2 4 40 1.0 19 240 -49 33 37 29 34 39 4 33 32 30 34 44 13 -1.73 - 99 0 1 34 2 57 4 40 4.2 18 241 -49 33 32 27 34 33 55 33 27 29 34 39 4 -1.73 - 98 0 1 33 58 39 4 40 7.3 18 242 -50 33 28 11 34 29 34 33 23 13 34 34 42 -1.73 - 97 0 1 33 55 6 4 40 10.2 17 243 -51 33 24 42 34 25 59 33 19 44 34 31 7 -1.74 - 96 0 1 33 52 21 4 40 13.1 16 243 -51 33 21 58 34 23 12 33 17 0 34 28 19 -1.74 - 95 0 1 33 50 22 4 40 15.8 15 244 -52 33 20 0 34 21 11 33 15 3 34 26 18 -1.74 - 94 0 1 33 49 9 4 40 18.4 15 245 -52 33 18 48 34 19 57 33 13 51 34 25 4 -1.74 - 93 0 1 33 48 42 4 40 20.8 14 245 -53 33 18 22 34 19 29 33 13 25 34 24 36 -1.74 - 92 0 1 33 49 1 4 40 23.2 13 246 -53 33 18 41 34 19 48 33 13 45 34 24 55 -1.74 - 91 0 0 33 50 6 4 40 25.4 12 247 -54 33 19 47 34 20 54 33 14 50 34 26 0 -1.75 - 90 0 0 33 51 58 4 40 27.4 12 247 -54 33 21 37 34 22 46 33 16 40 34 27 52 -1.75 - 89 0 0 33 54 35 4 40 29.4 11 248 -55 33 24 14 34 25 24 33 19 16 34 30 31 -1.75 - 88 0 0 33 57 58 4 40 31.1 10 248 -55 33 27 35 34 28 48 33 22 38 34 33 55 -1.76 - 87 0 0 34 2 6 4 40 32.8 9 249 -55 33 31 42 34 32 59 33 26 44 34 38 6 -1.76 - 86 0 0 34 7 1 4 40 34.3 8 250 -55 33 36 34 34 37 55 33 31 36 34 43 3 -1.77 - 85 0 0 34 12 41 4 40 35.7 8 250 -56 33 42 11 34 43 38 33 37 13 34 48 46 -1.77 - 84 0 0 34 19 6 4 40 36.9 7 251 -56 33 48 34 34 50 6 33 43 35 34 55 15 -1.78 - 83 0 0 34 26 16 4 40 38.0 6 251 -56 33 55 41 34 57 20 33 50 41 35 2 30 -1.79 - 82 0 0 34 34 12 4 40 39.0 5 252 -56 34 3 32 35 5 20 33 58 32 35 10 30 -1.81 - 81 0 0 34 42 52 4 40 39.8 4 253 -56 34 12 9 35 14 5 34 7 8 35 19 16 -1.83 - 80 0 0 34 52 18 4 40 40.4 3 253 -56 34 21 30 35 23 35 34 16 28 35 28 47 -1.86 - 79 0 0 35 2 28 4 40 40.9 3 254 -56 34 31 35 35 33 51 34 26 33 35 39 4 -1.91 - 78 0 0 35 13 24 4 40 41.3 2 254 -56 34 42 25 35 44 52 34 37 22 35 50 6 -2.02 - 77 0 0 35 25 3 4 40 41.5 1 255 -56 34 53 58 35 56 38 34 48 54 36 1 53 -2.32 - 76 0 0 35 37 27 4 40 41.6 0 255 -56 35 6 16 .. .. .. 35 1 11 .. .. .. -12.60 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 391-094961 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 45.5635 DE: -11 51 06.085 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 36 45.5634 DE: -11 51 06.085 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (246) Asporina asteroid class: approx. diameter [km]: 57 approx. diameter ["]: 0.036 distance from Earth [AU]: 2.17770 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#75 date of fit: 2023 Aug 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): 0.008", 0.001", 93.187° remarks: * orbital elements for (246)Asporina : Mean anomaly = 35.7586280398 deg Arg. of pericenter = 96.2072153313 deg Long. of node = 162.2720596269 deg Inclination = 15.6214631878 deg Eccentricity = 0.1084716454 Semimajor axis = 2.6938560601 AU Perihelion dist = 2.4016490608 AU Mag: H = 8.67, G = 0.15 Epoch of elements : MJD 60215.19291667 TDT (2023 Sep 28.1929) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#752023Aug22,3.09,2023,9,28,4.629538,0.337808,0.791329,9.587090,-4.094933,0.005536,0.000287,0.000000,0.000000 -156.6278,-11.8316,108.27,-1.91,False UCAC4 391-094961,18.61265655,-11.8516902,0.00,10.62,0.00,0.0,0,,18.63464163,-11.8316485,2.74,0.00,0,0,0 246,Asporina,13.27,57.100,2.1777,0,0,2.637,-16.53,,3.0,0 0,35.7156,2023,9,28,96.2072,162.2721,15.6215,0.10847,2.69386,2.40165,8.50,5.0,0.15 1.082,0.0083,0.0009,93,0.0084,Known errors,-1.00,0,-1,-1 20230928_094961,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org