IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 278-146153 event on 2023 Jul 18, 03:15 UT Visible from South America Summary ------- On 2023 Jul 18 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 11.6 mag star in the constellation Scorpius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.56 mag to 12.90 mag (the magnitude of the asteroid) for at most 16.500 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 Jul 18, 03:06 - 2023 Jul 18, 03:24 * geocentric midpoint of event [JD]: 2460143.63581417 * magnitude of target star: 11.64 * magnitude drop [mag]: 1.56 * estimated maximum duration [s]: 16.500 * Moon: 0 % sunlit, 149° distance * Sun: 152° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 204 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.016", 91°) * approx speed of asteroid's shadow [km/s]: 11.2489 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 278-146153 by 94 Aurora on 2023 Jul 18 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 -145 0 0 29 24 0 3 24 8.7 0 130 15 .. .. .. 28 10 58 .. .. .. 27 48 7 .... -144 0 0 28 39 7 3 24 8.6 1 131 14 29 53 3 27 26 9 30 16 35 27 3 20 -0.07 -143 0 0 27 54 2 3 24 8.2 2 131 13 29 7 53 26 41 10 29 31 23 26 18 23 -0.27 -142 0 0 27 8 48 3 24 7.6 4 132 12 28 22 32 25 56 3 28 46 1 25 33 17 -0.35 -141 0 0 26 23 27 3 24 6.7 5 132 10 27 37 3 25 10 49 28 0 29 24 48 6 -0.38 -140 0 0 25 38 1 3 24 5.6 6 133 9 26 51 28 24 25 31 27 14 51 24 2 50 -0.40 -139 0 0 24 52 31 3 24 4.2 7 133 8 26 5 49 23 40 10 26 29 9 23 17 33 -0.42 -138 0 0 24 7 0 3 24 2.5 8 134 7 25 20 7 22 54 49 25 43 24 22 32 15 -0.43 -137 0 0 23 21 29 3 24 0.5 9 134 6 24 34 25 22 9 29 24 57 38 21 46 58 -0.43 -136 0 0 22 36 1 3 23 58.3 11 134 5 23 48 45 21 24 13 24 11 54 21 1 45 -0.44 -135 0 0 21 50 37 3 23 55.8 12 135 4 23 3 8 20 39 2 23 26 13 20 16 38 -0.45 -134 0 0 21 5 19 3 23 53.1 13 135 3 22 17 37 19 53 57 22 40 37 19 31 37 -0.45 -133 0 0 20 20 10 3 23 50.1 14 136 2 21 32 13 19 9 1 21 55 9 18 46 46 -0.45 -132 0 0 19 35 10 3 23 46.8 15 136 0 20 46 58 18 24 16 21 9 49 18 2 5 -0.46 -131 0 0 18 50 22 3 23 43.3 16 136 -1 20 1 55 17 39 44 20 24 41 17 17 37 -0.46 -130 0 0 18 5 48 3 23 39.5 18 137 -2 19 17 5 16 55 25 19 39 45 16 33 23 -0.46 -129 0 0 17 21 29 3 23 35.4 19 137 -3 18 32 29 16 11 22 18 55 4 15 49 25 -0.46 -128 0 0 16 37 27 3 23 31.1 20 137 -4 17 48 9 15 27 36 18 10 39 15 5 44 -0.46 -127 0 0 15 53 42 3 23 26.6 21 138 -5 17 4 8 14 44 9 17 26 32 14 22 22 -0.46 -126 0 0 15 10 18 3 23 21.8 22 138 -7 16 20 26 14 1 2 16 42 44 13 39 21 -0.46 -125 0 0 14 27 15 3 23 16.8 23 138 -8 15 37 5 13 18 17 15 59 17 12 56 41 -0.47 -124 0 0 13 44 35 3 23 11.5 25 139 -9 14 54 6 12 35 54 15 16 12 12 14 24 -0.47 -123 0 0 13 2 19 3 23 6.1 26 139 -10 14 11 31 11 53 56 14 33 31 11 32 32 -0.47 -122 0 0 12 20 28 3 23 0.4 27 139 -11 13 29 21 11 12 24 13 51 15 10 51 5 -0.47 -121 0 0 11 39 4 3 22 54.4 28 140 -12 12 47 38 10 31 18 13 9 26 10 10 5 -0.47 -120 0 0 10 58 8 3 22 48.3 29 140 -13 12 6 22 9 50 40 12 28 3 9 29 33 -0.47 -119 0 0 10 17 40 3 22 42.0 30 140 -15 11 25 34 9 10 31 11 47 10 8 49 30 -0.47 -118 0 0 9 37 42 3 22 35.5 31 141 -16 10 45 17 8 30 52 11 6 46 8 9 56 -0.47 -117 0 0 8 58 14 3 22 28.8 33 141 -17 10 5 30 7 51 44 10 26 53 7 30 54 -0.47 -116 0 0 8 19 19 3 22 21.9 34 142 -18 9 26 15 7 13 7 9 47 31 6 52 23 -0.47 -115 0 0 7 40 55 3 22 14.8 35 142 -19 8 47 32 6 35 3 9 8 42 6 14 24 -0.47 -114 0 0 7 3 6 3 22 7.6 36 142 -20 8 9 22 5 57 32 8 30 26 5 36 59 -0.47 -113 0 0 6 25 50 3 22 0.2 37 143 -21 7 31 47 5 20 34 7 52 44 5 0 8 -0.47 -112 0 0 5 49 8 3 21 52.7 38 143 -23 6 54 46 4 44 12 7 15 37 4 23 51 -0.47 -111 0 0 5 13 2 3 21 45.0 39 144 -24 6 18 21 4 8 24 6 39 6 3 48 9 -0.47 -110 0 0 4 37 32 3 21 37.1 40 144 -25 5 42 32 3 33 13 6 3 10 3 13 3 -0.47 -109 0 0 4 2 38 3 21 29.2 41 144 -26 5 7 19 2 58 37 5 27 52 2 38 34 -0.47 -108 0 0 3 28 21 3 21 21.1 42 145 -27 4 32 43 2 24 38 4 53 10 2 4 40 -0.47 -107 0 0 2 54 41 3 21 12.8 43 145 -28 3 58 45 1 51 17 4 19 5 1 31 24 -0.47 -106 0 0 2 21 39 3 21 4.5 44 146 -29 3 25 24 1 18 32 3 45 39 0 58 45 -0.47 -105 0 0 1 49 15 3 20 56.0 45 146 -30 2 52 42 0 46 26 3 12 51 0 26 44 -0.47 -104 0 0 1 17 30 3 20 47.5 46 147 -31 2 20 38 0 14 58 2 40 41 - 0 4 39 -0.47 -103 0 0 0 46 22 3 20 38.8 47 148 -33 1 49 13 - 0 15 53 2 9 11 - 0 35 24 -0.47 -102 0 0 0 15 54 3 20 30.1 48 148 -34 1 18 28 - 0 46 4 1 38 20 - 1 5 30 -0.47 -101 0 0 - 0 13 56 3 20 21.3 49 149 -35 0 48 21 - 1 15 37 1 8 8 - 1 34 58 -0.47 -100 0 0 - 0 43 6 3 20 12.4 50 150 -36 0 18 54 - 1 44 31 0 38 35 - 2 3 46 -0.47 - 99 0 0 - 1 11 37 3 20 3.4 51 150 -37 - 0 9 53 - 2 12 46 0 9 42 - 2 31 56 -0.47 - 98 0 0 - 1 39 28 3 19 54.3 52 151 -38 - 0 38 1 - 2 40 21 - 0 18 31 - 2 59 27 -0.47 - 97 0 0 - 2 6 40 3 19 45.2 52 152 -39 - 1 5 29 - 3 7 18 - 0 46 3 - 3 26 19 -0.47 - 96 0 0 - 2 33 12 3 19 36.0 53 153 -40 - 1 32 17 - 3 33 35 - 1 12 56 - 3 52 31 -0.47 - 95 0 0 - 2 59 5 3 19 26.8 54 153 -41 - 1 58 25 - 3 59 13 - 1 39 9 - 4 18 5 -0.47 - 94 0 0 - 3 24 18 3 19 17.5 55 154 -42 - 2 23 52 - 4 24 11 - 2 4 42 - 4 42 59 -0.47 - 93 0 0 - 3 48 51 3 19 8.1 56 155 -43 - 2 48 40 - 4 48 31 - 2 29 34 - 5 7 13 -0.47 - 92 0 0 - 4 12 45 3 18 58.8 56 156 -44 - 3 12 48 - 5 12 10 - 2 53 47 - 5 30 49 -0.46 - 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43 0 0 -10 38 25 3 11 26.2 53 225 -79 - 9 42 18 -11 34 7 - 9 24 30 -11 51 36 -0.47 - 42 0 0 -10 30 36 3 11 17.9 52 226 -79 - 9 34 23 -11 26 23 - 9 16 34 -11 43 53 -0.47 - 41 0 0 -10 22 8 3 11 9.7 51 226 -78 - 9 25 50 -11 18 0 - 9 7 59 -11 35 33 -0.47 - 40 0 0 -10 13 2 3 11 1.6 50 227 -78 - 9 16 38 -11 9 0 - 8 58 45 -11 26 34 -0.47 - 39 0 0 -10 3 18 3 10 53.5 50 227 -77 - 9 6 47 -10 59 22 - 8 48 52 -11 16 58 -0.47 - 38 0 0 - 9 52 55 3 10 45.6 49 228 -76 - 8 56 17 -10 49 6 - 8 38 20 -11 6 44 -0.47 - 37 0 0 - 9 41 53 3 10 37.7 48 228 -76 - 8 45 9 -10 38 11 - 8 27 9 -10 55 51 -0.47 - 36 0 0 - 9 30 13 3 10 29.8 47 229 -75 - 8 33 20 -10 26 38 - 8 15 18 -10 44 20 -0.47 - 35 0 0 - 9 17 53 3 10 22.1 46 229 -74 - 8 20 53 -10 14 26 - 8 2 48 -10 32 11 -0.47 - 34 0 0 - 9 4 54 3 10 14.5 45 229 -73 - 8 7 46 -10 1 36 - 7 49 38 -10 19 23 -0.47 - 33 0 0 - 8 51 16 3 10 6.9 44 229 -72 - 7 53 59 - 9 48 6 - 7 35 49 -10 5 56 -0.47 - 32 0 0 - 8 36 59 3 9 59.4 44 230 -72 - 7 39 32 - 9 33 58 - 7 21 19 - 9 51 51 -0.47 - 31 0 0 - 8 22 2 3 9 52.0 43 230 -71 - 7 24 26 - 9 19 10 - 7 6 9 - 9 37 6 -0.47 - 30 0 0 - 8 6 25 3 9 44.8 42 230 -70 - 7 8 39 - 9 3 43 - 6 50 19 - 9 21 42 -0.47 - 29 0 0 - 7 50 8 3 9 37.6 41 230 -69 - 6 52 12 - 8 47 37 - 6 33 49 - 9 5 39 -0.47 - 28 0 0 - 7 33 12 3 9 30.5 40 231 -68 - 6 35 4 - 8 30 51 - 6 16 38 - 8 48 56 -0.47 - 27 0 0 - 7 15 35 3 9 23.5 39 231 -67 - 6 17 16 - 8 13 24 - 5 58 46 - 8 31 33 -0.47 - 26 0 0 - 6 57 17 3 9 16.6 38 231 -66 - 5 58 46 - 7 55 18 - 5 40 13 - 8 13 31 -0.47 - 25 0 0 - 6 38 19 3 9 9.9 37 231 -65 - 5 39 36 - 7 36 32 - 5 20 59 - 7 54 48 -0.47 - 24 0 0 - 6 18 40 3 9 3.3 36 231 -64 - 5 19 45 - 7 17 6 - 5 1 3 - 7 35 25 -0.48 - 23 0 0 - 5 58 21 3 8 56.7 35 232 -63 - 4 59 13 - 6 56 59 - 4 40 27 - 7 15 22 -0.48 - 22 0 0 - 5 37 20 3 8 50.3 34 232 -62 - 4 37 59 - 6 36 11 - 4 19 8 - 6 54 39 -0.48 - 21 0 0 - 5 15 38 3 8 44.1 33 232 -61 - 4 16 3 - 6 14 42 - 3 57 8 - 6 33 14 -0.48 - 20 0 0 - 4 53 15 3 8 38.0 32 232 -60 - 3 53 26 - 5 52 33 - 3 34 27 - 6 11 9 -0.48 - 19 0 0 - 4 30 11 3 8 32.0 31 232 -59 - 3 30 7 - 5 29 43 - 3 11 3 - 5 48 23 -0.48 - 18 0 0 - 4 6 25 3 8 26.1 30 232 -58 - 3 6 6 - 5 6 11 - 2 46 58 - 5 24 56 -0.48 - 17 0 0 - 3 41 57 3 8 20.4 29 232 -57 - 2 41 23 - 4 41 59 - 2 22 10 - 5 0 48 -0.48 - 16 0 0 - 3 16 48 3 8 14.9 28 232 -56 - 2 15 59 - 4 17 5 - 1 56 40 - 4 35 59 -0.48 - 15 0 0 - 2 50 58 3 8 9.5 27 232 -55 - 1 49 52 - 3 51 30 - 1 30 28 - 4 10 29 -0.48 - 14 0 0 - 2 24 25 3 8 4.2 26 232 -54 - 1 23 3 - 3 25 13 - 1 3 34 - 3 44 17 -0.48 - 13 0 0 - 1 57 11 3 7 59.1 25 233 -53 - 0 55 32 - 2 58 15 - 0 35 57 - 3 17 24 -0.48 - 12 0 0 - 1 29 15 3 7 54.2 24 233 -52 - 0 27 18 - 2 30 36 - 0 7 38 - 2 49 50 -0.48 - 11 0 0 - 1 0 37 3 7 49.5 23 233 -51 0 1 37 - 2 2 15 0 21 23 - 2 21 35 -0.48 - 10 0 0 - 0 31 17 3 7 44.9 22 233 -50 0 31 14 - 1 33 13 0 51 6 - 1 52 38 -0.48 - 9 0 0 - 0 1 16 3 7 40.6 21 233 -49 1 1 34 - 1 3 29 1 21 31 - 1 23 0 -0.48 - 8 0 0 0 29 26 3 7 36.4 20 233 -48 1 32 35 - 0 33 5 1 52 38 - 0 52 41 -0.49 - 7 0 0 1 0 50 3 7 32.4 19 233 -47 2 4 17 - 0 1 59 2 24 27 - 0 21 41 -0.49 - 6 0 0 1 32 55 3 7 28.6 18 233 -45 2 36 42 0 29 47 2 56 57 0 10 0 -0.49 - 5 0 0 2 5 41 3 7 25.1 16 233 -44 3 9 47 1 2 15 3 30 8 0 42 21 -0.49 - 4 0 0 2 39 8 3 7 21.7 15 233 -43 3 43 33 1 35 22 4 4 1 1 15 23 -0.49 - 3 0 0 3 13 15 3 7 18.6 14 233 -42 4 18 0 2 9 10 4 38 34 1 49 5 -0.49 - 2 0 0 3 48 2 3 7 15.7 13 233 -41 4 53 7 2 43 37 5 13 48 2 23 26 -0.49 - 1 0 0 4 23 28 3 7 13.0 12 233 -40 5 28 54 3 18 44 5 49 41 2 58 27 -0.49 0 0 0 4 59 34 3 7 10.5 11 234 -39 6 5 20 3 54 30 6 26 14 3 34 6 -0.49 1 0 0 5 36 18 3 7 8.3 10 234 -37 6 42 24 4 30 54 7 3 25 4 10 24 -0.50 2 0 0 6 13 40 3 7 6.3 8 234 -36 7 20 7 5 7 56 7 41 15 4 47 20 -0.50 3 0 0 6 51 40 3 7 4.6 7 234 -35 7 58 28 5 45 35 8 19 42 5 24 54 -0.50 4 0 0 7 30 16 3 7 3.1 6 234 -34 8 37 25 6 23 51 8 58 46 6 3 3 -0.50 5 0 0 8 9 28 3 7 1.9 5 234 -33 9 16 59 7 2 43 9 38 26 6 41 49 -0.51 6 0 0 8 49 16 3 7 0.9 4 234 -32 9 57 7 7 42 11 10 18 42 7 21 10 -0.51 7 0 0 9 29 37 3 7 0.2 3 234 -30 10 37 50 8 22 12 10 59 31 8 1 5 -0.53 8 0 0 10 10 32 3 6 59.8 1 235 -29 11 19 6 9 2 47 11 40 54 8 41 34 -0.56 9 0 0 10 52 0 3 6 59.6 0 235 -28 .. .. .. 9 43 54 .. .. .. 9 22 35 -1.24 Uncertainty in time = +/- 4 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 278-146153 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 46.8950 DE: -34 25 09.102 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 54 46.8950 DE: -34 25 09.103 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.104 distance from Earth [AU]: 2.46620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 date of fit: 2023 Apr 24 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): 0.025", 0.016", 91.482° remarks: * orbital elements for (94)Aurora : Mean anomaly = 220.1459486392 deg Arg. of pericenter = 60.2462174429 deg Long. of node = 2.5475840448 deg Inclination = 7.9708152895 deg Eccentricity = 0.0954106203 Semimajor axis = 3.1555762825 AU Perihelion dist = 2.8545007919 AU Mag: H = 7.72, G = 0.15 Epoch of elements : MJD 60143.13569445 TDT (2023 Jul 18.1357) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Apr24,16.50,2023,7,18,3.259540,0.083970,0.410437,-6.220439,1.272208,0.002515,0.000958,0.000001,0.000000 -75.4841,-34.4243,132.67,21.08,False UCAC4 278-146153,17.91302639,-34.4191951,0.00,11.64,0.00,0.0,0,,17.93936711,-34.4243126,1.56,0.00,0,0,0 94,Aurora,12.90,185.6,2.4662,0,0,-1.792,4.54,,10.4,0 0,220.1221,2023,7,18,60.2462,2.5476,7.9708,0.09541,3.15558,2.85450,7.72,5.0,0.15 1.158,0.0253,0.0160,91,0.0164,Known errors,-1.00,-1,-1,-1 20230718_146153,60092.98 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org