IOTA/IOTA-ES occultation update for (6353) Semper / UCAC4 331-087849 event on 2024 Mar 14, 00:30 UT Visible from Summary ------- On 2024 Mar 14 UT, the 16.055 km diameter asteroid (6353) Semper will occult a 11.9 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.03 mag to 18.92 mag (the magnitude of the asteroid) for at most 1.570 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: 98 * date and approx. time of event: 2024 Mar 14, 00:25 - 2024 Mar 14, 00:35 * geocentric midpoint of event [JD]: 2460383.52107404 * magnitude of target star: 11.89 * magnitude drop [mag]: 7.03 * estimated maximum duration [s]: 1.570 * Moon: 18 % sunlit, 148° distance * Sun: 98° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 10.1993 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 331-087849 by 6353 Semper on 2024 Mar 14 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 41 0 0 61 33 59 0 25 23.5 0 148 -22 61 17 4 .. .. .. 61 5 1 .. .. .. .... 42 0 0 60 47 34 0 25 23.7 1 149 -22 60 31 0 61 4 24 60 19 12 61 16 45 -0.58 43 0 0 60 1 25 0 25 24.1 2 150 -22 59 45 12 60 17 54 59 33 38 60 29 58 -1.18 44 0 0 59 15 35 0 25 24.9 3 151 -22 58 59 41 59 31 43 58 48 22 59 43 31 -1.38 45 0 0 58 30 5 0 25 26.1 4 152 -22 58 14 31 58 45 53 58 3 24 58 57 27 -1.49 46 0 0 57 44 58 0 25 27.6 5 153 -22 57 29 42 58 0 27 57 18 49 58 11 46 -1.55 47 0 0 57 0 16 0 25 29.4 6 153 -22 56 45 18 57 15 27 56 34 36 57 26 32 -1.59 48 0 0 56 16 1 0 25 31.5 6 154 -22 56 1 19 56 30 54 55 50 50 56 41 46 -1.62 49 0 0 55 32 14 0 25 34.0 7 155 -22 55 17 49 55 46 50 55 7 30 55 57 30 -1.65 50 0 0 54 48 57 0 25 36.9 8 156 -22 54 34 47 55 3 17 54 24 39 55 13 45 -1.66 51 0 0 54 6 11 0 25 40.0 9 157 -22 53 52 16 54 20 16 53 42 19 54 30 32 -1.68 52 0 0 53 23 59 0 25 43.5 10 158 -21 53 10 18 53 37 49 53 0 31 53 47 54 -1.69 53 0 0 52 42 21 0 25 47.3 11 159 -21 52 28 54 52 55 57 52 19 16 53 5 51 -1.70 54 0 0 52 1 19 0 25 51.4 12 159 -21 51 48 5 52 14 41 51 38 37 52 24 26 -1.71 55 0 0 51 20 54 0 25 55.8 13 160 -21 51 7 53 51 34 3 50 58 33 51 43 38 -1.72 56 0 0 50 41 7 0 26 0.5 13 161 -20 50 28 18 50 54 4 50 19 7 51 3 30 -1.73 57 0 0 50 2 0 0 26 5.5 14 162 -20 49 49 22 50 14 44 49 40 19 50 24 2 -1.73 58 0 0 49 23 32 0 26 10.8 15 163 -20 49 11 5 49 36 6 49 2 10 49 45 14 -1.74 59 0 0 48 45 46 0 26 16.4 16 164 -19 48 33 30 48 58 9 48 24 43 49 7 9 -1.74 60 0 0 48 8 43 0 26 22.2 17 165 -19 47 56 38 48 20 56 47 47 57 48 29 48 -1.75 61 0 0 47 32 24 0 26 28.3 17 166 -18 47 20 28 47 44 26 47 11 54 47 53 11 -1.75 62 0 0 46 56 48 0 26 34.6 18 167 -18 46 45 2 47 8 41 46 36 35 47 17 19 -1.76 63 0 0 46 21 58 0 26 41.2 19 168 -17 46 10 20 46 33 41 46 2 0 46 42 12 -1.76 64 0 0 45 47 53 0 26 48.1 20 169 -17 45 36 24 45 59 27 45 28 9 46 7 52 -1.77 65 0 0 45 14 34 0 26 55.1 20 169 -16 45 3 14 45 26 0 44 55 5 45 34 19 -1.77 66 0 0 44 42 3 0 27 2.4 21 170 -16 44 30 50 44 53 20 44 22 47 45 1 33 -1.77 67 0 0 44 10 19 0 27 9.9 22 171 -15 43 59 14 44 21 29 43 51 16 44 29 36 -1.78 68 0 0 43 39 23 0 27 17.5 22 172 -14 43 28 25 43 50 26 43 20 33 43 58 27 -1.78 69 0 0 43 9 16 0 27 25.4 23 173 -14 42 58 26 43 20 12 42 50 38 43 28 8 -1.78 70 0 0 42 39 59 0 27 33.4 23 174 -13 42 29 15 42 50 47 42 21 32 42 58 38 -1.79 71 0 0 42 11 30 0 27 41.6 24 175 -12 42 0 53 42 22 12 41 53 15 42 29 59 -1.79 72 0 0 41 43 53 0 27 50.0 24 176 -12 41 33 22 41 54 28 41 25 48 42 2 10 -1.79 73 0 0 41 17 6 0 27 58.5 25 177 -11 41 6 40 41 27 35 40 59 11 41 35 13 -1.80 74 0 0 40 51 9 0 28 7.1 25 179 -10 40 40 49 41 1 33 40 33 24 41 9 6 -1.80 75 0 0 40 26 4 0 28 15.8 26 180 -9 40 15 49 40 36 22 40 8 28 40 43 51 -1.80 76 0 0 40 1 51 0 28 24.7 26 181 -9 39 51 41 40 12 4 39 44 23 40 19 29 -1.81 77 0 0 39 38 29 0 28 33.7 27 182 -8 39 28 24 39 48 37 39 21 10 39 55 59 -1.81 78 0 0 39 15 59 0 28 42.7 27 183 -7 39 5 59 39 26 3 38 58 48 39 33 21 -1.81 79 0 0 38 54 21 0 28 51.9 27 184 -6 38 44 26 39 4 20 38 37 18 39 11 35 -1.81 80 0 0 38 33 36 0 29 1.1 27 185 -5 38 23 45 38 43 31 38 16 40 38 50 43 -1.82 81 0 0 38 13 43 0 29 10.4 28 186 -5 38 3 56 38 23 34 37 56 54 38 30 43 -1.82 82 0 0 37 54 43 0 29 19.7 28 187 -4 37 45 0 38 4 30 37 38 0 38 11 36 -1.82 83 0 0 37 36 36 0 29 29.1 28 188 -3 37 26 56 37 46 19 37 19 59 37 53 22 -1.82 84 0 0 37 19 21 0 29 38.5 28 189 -2 37 9 44 37 29 1 37 2 50 37 36 2 -1.83 85 0 0 37 2 59 0 29 48.0 28 190 -1 36 53 26 37 12 36 36 46 34 37 19 34 -1.83 86 0 0 36 47 31 0 29 57.4 29 191 0 36 38 1 36 57 4 36 31 10 37 4 1 -1.83 87 0 0 36 32 56 0 30 6.9 29 193 0 36 23 28 36 42 27 36 16 40 36 49 21 -1.83 88 0 0 36 19 14 0 30 16.4 29 194 1 36 9 49 36 28 42 36 3 3 36 35 34 -1.83 89 0 0 36 6 26 0 30 25.8 29 195 2 35 57 3 36 15 51 35 50 19 36 22 41 -1.83 90 0 0 35 54 30 0 30 35.3 29 196 3 35 45 10 36 3 53 35 38 27 36 10 42 -1.84 91 0 0 35 43 28 0 30 44.7 29 197 4 35 34 10 35 52 49 35 27 29 35 59 36 -1.84 92 0 0 35 33 20 0 30 54.0 28 198 5 35 24 4 35 42 39 35 17 24 35 49 24 -1.84 93 0 0 35 24 4 0 31 3.4 28 199 5 35 14 50 35 33 21 35 8 11 35 40 5 -1.84 94 0 0 35 15 42 0 31 12.6 28 200 6 35 6 29 35 24 57 34 59 52 35 31 40 -1.84 95 0 0 35 8 13 0 31 21.8 28 201 7 34 59 2 35 17 27 34 52 25 35 24 9 -1.84 96 0 0 35 1 37 0 31 31.0 28 202 8 34 52 27 35 10 50 34 45 52 35 17 31 -1.84 97 0 0 34 55 55 0 31 40.0 28 203 9 34 46 46 35 5 6 34 40 11 35 11 46 -1.84 98 0 0 34 51 5 0 31 49.0 27 204 10 34 41 57 35 0 16 34 35 23 35 6 55 -1.84 99 0 0 34 47 9 0 31 57.9 27 205 11 34 38 2 34 56 18 34 31 28 35 2 57 -1.84 100 0 0 34 44 5 0 32 6.6 27 206 11 34 34 59 34 53 14 34 28 26 34 59 52 -1.85 101 0 0 34 41 55 0 32 15.3 26 207 12 34 32 49 34 51 3 34 26 16 34 57 41 -1.85 102 0 0 34 40 37 0 32 23.9 26 208 13 34 31 31 34 49 45 34 24 59 34 56 22 -1.85 103 0 0 34 40 12 0 32 32.3 25 209 14 34 31 7 34 49 20 34 24 35 34 55 57 -1.85 104 0 0 34 40 40 0 32 40.6 25 210 15 34 31 35 34 49 48 34 25 3 34 56 25 -1.85 105 0 0 34 42 0 0 32 48.7 25 211 16 34 32 55 34 51 8 34 26 23 34 57 46 -1.85 106 0 0 34 44 13 0 32 56.7 24 212 16 34 35 8 34 53 21 34 28 35 34 59 59 -1.85 107 0 0 34 47 19 0 33 4.6 24 213 17 34 38 13 34 56 27 34 31 40 35 3 5 -1.85 108 0 0 34 51 16 0 33 12.3 23 214 18 34 42 10 35 0 25 34 35 37 35 7 4 -1.85 109 0 0 34 56 6 0 33 19.8 23 214 19 34 46 59 35 5 16 34 40 25 35 11 55 -1.85 110 0 0 35 1 48 0 33 27.2 22 215 20 34 52 40 35 10 59 34 46 6 35 17 38 -1.85 111 0 0 35 8 22 0 33 34.4 21 216 20 34 59 13 35 17 33 34 52 38 35 24 14 -1.85 112 0 0 35 15 47 0 33 41.4 21 217 21 35 6 37 35 25 0 35 0 2 35 31 41 -1.85 113 0 0 35 24 5 0 33 48.2 20 218 22 35 14 53 35 33 19 35 8 17 35 40 1 -1.85 114 0 0 35 33 14 0 33 54.8 20 219 23 35 24 1 35 42 30 35 17 24 35 49 13 -1.85 115 0 0 35 43 15 0 34 1.2 19 219 23 35 34 0 35 52 32 35 27 21 35 59 16 -1.85 116 0 0 35 54 7 0 34 7.4 18 220 24 35 44 50 36 3 26 35 38 10 36 10 12 -1.85 117 0 0 36 5 50 0 34 13.3 18 221 25 35 56 31 36 15 11 35 49 50 36 21 58 -1.85 118 0 0 36 18 24 0 34 19.1 17 222 25 36 9 3 36 27 47 36 2 20 36 34 36 -1.85 119 0 0 36 31 49 0 34 24.6 16 222 26 36 22 26 36 41 15 36 15 41 36 48 5 -1.85 120 0 0 36 46 5 0 34 29.9 15 223 27 36 36 39 36 55 33 36 29 53 37 2 25 -1.85 121 0 0 37 1 11 0 34 35.0 15 224 27 36 51 43 37 10 42 36 44 55 37 17 36 -1.85 122 0 0 37 17 7 0 34 39.8 14 225 28 37 7 37 37 26 41 37 0 46 37 33 38 -1.85 123 0 0 37 33 54 0 34 44.3 13 225 29 37 24 21 37 43 31 37 17 28 37 50 30 -1.85 124 0 0 37 51 31 0 34 48.6 12 226 29 37 41 54 38 1 11 37 34 59 38 8 12 -1.85 125 0 0 38 9 57 0 34 52.7 12 227 30 38 0 17 38 19 41 37 53 20 38 26 44 -1.85 126 0 0 38 29 13 0 34 56.5 11 227 30 38 19 29 38 39 0 38 12 30 38 46 6 -1.85 127 0 0 38 49 18 0 35 0.0 10 228 31 38 39 31 38 59 9 38 32 28 39 6 18 -1.86 128 0 0 39 10 12 0 35 3.2 9 229 31 39 0 21 39 20 7 38 53 16 39 27 19 -1.86 129 0 0 39 31 55 0 35 6.2 8 229 32 39 22 0 39 41 55 39 14 51 39 49 10 -1.86 130 0 0 39 54 27 0 35 8.9 7 230 32 39 44 27 40 4 30 39 37 15 40 11 49 -1.87 131 0 0 40 17 46 0 35 11.3 7 231 32 40 7 41 40 27 54 40 0 27 40 35 16 -1.88 132 0 0 40 41 53 0 35 13.4 6 231 33 40 31 44 40 52 7 40 24 26 40 59 32 -1.89 133 0 0 41 6 48 0 35 15.2 5 232 33 40 56 33 41 17 6 40 49 12 41 24 35 -1.90 134 0 0 41 32 30 0 35 16.7 4 233 33 41 22 10 41 42 54 41 14 45 41 50 27 -1.92 135 0 0 41 58 58 0 35 18.0 3 233 34 41 48 33 42 9 28 41 41 4 42 17 5 -1.95 136 0 0 42 26 13 0 35 18.9 2 234 34 42 15 42 42 36 48 42 8 9 42 44 30 -2.00 137 0 0 42 54 14 0 35 19.5 1 235 34 42 43 37 43 4 55 42 35 59 43 12 41 -2.12 138 0 0 43 23 0 0 35 19.8 1 235 34 43 12 17 43 33 48 43 4 34 43 41 39 -2.57 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 331-087849 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 57 02.7908 DE: -23 56 06.379 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 57 02.7910 DE: -23 56 06.379 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6353) Semper asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.20040 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 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): 0.013", 0.002", 97.8° remarks: * orbital elements for (6353)Semper : Mean anomaly = 134.8206558013 deg Arg. of pericenter = 61.7685335449 deg Long. of node = 31.3230871185 deg Inclination = 2.5086950311 deg Eccentricity = 0.1599274613 Semimajor axis = 3.0970963487 AU Perihelion dist = 2.6017855922 AU Mag: H = 12.81, G = 0.15 Epoch of elements : MJD 60383.02107404 TDT (2024 Mar 14.0211) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,1.57,2024,3,14,0.505777,0.189251,0.855956,5.620471,-1.245205,-0.005880,0.000641,0.000000,0.000000 74.9173,-23.9735,174.71,-2.41,False UCAC4 331-087849,16.95077521,-23.9351051,12.25,11.89,11.70,0.0,0,,16.97522589,-23.9735287,7.03,6.77,0,0,0 6353,Semper,18.92,16.055,3.2004,0,0,1.127,-3.42,,1.4,0 0,134.6360,2024,3,13,61.7685,31.3231,2.5087,0.15993,3.09710,2.60179,12.80,5.0,0.15 1.361,0.0133,0.0023,98,0.0025,Known errors,1.29,0,-1,-1 20240314_087849,60139.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org