IOTA/IOTA-ES occultation update for (49513) 1999 CK28 / UCAC4 342-170965 event on 2024 Oct 19, 02:11 UT Visible from Summary ------- On 2024 Oct 19 UT, the 18.9672262998815 km diameter asteroid (49513) 1999 CK28 will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.01 mag to 18.90 mag (the magnitude of the asteroid) for at most 0.860 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: 2024 Oct 19, 02:07 - 2024 Oct 19, 02:16 * geocentric midpoint of event [JD]: 2460602.59138275 * magnitude of target star: 11.89 * magnitude drop [mag]: 7.01 * estimated maximum duration [s]: 0.860 * Moon: 96 % sunlit, 125° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.001", 108°) * approx speed of asteroid's shadow [km/s]: 22.4308 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 342-170965 by 49513 1999 CK28 on 2024 Oct 19 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 148 0 0 30 5 39 2 7 9.5 0 115 50 29 59 32 30 11 47 29 55 42 30 15 37 .... 149 0 0 29 40 55 2 7 9.5 1 116 50 29 34 47 29 47 3 29 30 57 29 50 53 -0.11 150 0 0 29 15 55 2 7 9.7 2 116 50 29 9 47 29 22 3 29 5 56 29 25 54 -0.22 151 0 0 28 50 40 2 7 9.9 3 117 51 28 44 31 28 56 49 28 40 40 29 0 40 -0.26 152 0 0 28 25 10 2 7 10.3 4 117 51 28 19 1 28 31 19 28 15 10 28 35 11 -0.29 153 0 0 27 59 26 2 7 10.7 5 118 51 27 53 17 28 5 36 27 49 25 28 9 27 -0.30 154 0 0 27 33 28 2 7 11.2 6 118 51 27 27 18 27 39 38 27 23 27 27 43 30 -0.31 155 0 0 27 7 17 2 7 11.8 7 119 51 27 1 7 27 13 28 26 57 16 27 17 20 -0.32 156 0 0 26 40 54 2 7 12.5 8 119 52 26 34 43 26 47 4 26 30 52 26 50 57 -0.32 157 0 0 26 14 18 2 7 13.3 9 120 52 26 8 8 26 20 29 26 4 16 26 24 21 -0.33 158 0 0 25 47 31 2 7 14.2 10 120 52 25 41 20 25 53 42 25 37 28 25 57 35 -0.33 159 0 0 25 20 34 2 7 15.2 11 120 52 25 14 22 25 26 45 25 10 30 25 30 37 -0.33 160 0 0 24 53 26 2 7 16.3 12 121 52 24 47 14 24 59 37 24 43 22 25 3 30 -0.34 161 0 0 24 26 8 2 7 17.4 13 121 52 24 19 57 24 32 20 24 16 4 24 36 12 -0.34 162 0 0 23 58 41 2 7 18.7 14 122 52 23 52 30 24 4 53 23 48 38 24 8 46 -0.34 163 0 0 23 31 7 2 7 20.1 15 122 52 23 24 55 23 37 19 23 21 3 23 41 12 -0.34 164 0 0 23 3 25 2 7 21.6 16 123 52 22 57 13 23 9 37 22 53 20 23 13 30 -0.34 165 0 0 22 35 36 2 7 23.2 17 123 52 22 29 24 22 41 48 22 25 31 22 45 41 -0.35 166 0 0 22 7 41 2 7 24.9 18 124 51 22 1 29 22 13 53 21 57 36 22 17 46 -0.35 167 0 0 21 39 40 2 7 26.6 19 124 51 21 33 28 21 45 52 21 29 36 21 49 45 -0.35 168 0 0 21 11 35 2 7 28.5 20 124 51 21 5 24 21 17 47 21 1 31 21 21 40 -0.35 169 0 0 20 43 26 2 7 30.5 21 125 51 20 37 15 20 49 38 20 33 22 20 53 31 -0.35 170 0 0 20 15 15 2 7 32.6 22 125 51 20 9 3 20 21 26 20 5 11 20 25 19 -0.35 171 0 0 19 47 0 2 7 34.8 24 126 50 19 40 49 19 53 12 19 36 57 19 57 5 -0.35 172 0 0 19 18 45 2 7 37.1 25 126 50 19 12 33 19 24 56 19 8 41 19 28 49 -0.35 173 0 0 18 50 28 2 7 39.5 26 126 50 18 44 17 18 56 40 18 40 25 19 0 32 -0.35 174 0 0 18 22 12 2 7 41.9 27 127 49 18 16 1 18 28 23 18 12 9 18 32 16 -0.35 175 0 0 17 53 56 2 7 44.5 28 127 49 17 47 46 18 0 8 17 43 54 18 4 0 -0.35 176 0 0 17 25 43 2 7 47.2 29 128 48 17 19 32 17 31 53 17 15 41 17 35 46 -0.35 177 0 0 16 57 31 2 7 50.0 30 128 48 16 51 21 17 3 42 16 47 30 17 7 34 -0.36 178 0 0 16 29 23 2 7 52.9 31 129 47 16 23 14 16 35 34 16 19 22 16 39 25 -0.36 179 0 0 16 1 20 2 7 55.8 32 129 47 15 55 10 16 7 29 15 51 19 16 11 21 -0.36 -180 0 0 15 33 21 2 7 58.9 33 129 46 15 27 11 15 39 30 15 23 20 15 43 21 -0.36 -179 0 0 15 5 27 2 8 2.1 34 130 46 14 59 18 15 11 36 14 55 28 15 15 28 -0.36 -178 0 0 14 37 40 2 8 5.3 35 130 45 14 31 32 14 43 49 14 27 42 14 47 40 -0.36 -177 0 0 14 10 1 2 8 8.7 36 131 45 14 3 53 14 16 9 14 0 3 14 20 0 -0.36 -176 0 0 13 42 29 2 8 12.1 37 131 44 13 36 22 13 48 37 13 32 32 13 52 28 -0.36 -175 0 0 13 15 7 2 8 15.6 38 132 43 13 9 0 13 21 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- 3 13 48 2 12 29.1 67 217 -4 - 3 19 24 - 3 8 11 - 3 22 54 - 3 4 41 -0.38 -121 0 0 - 3 20 48 2 12 34.1 66 219 -5 - 3 26 24 - 3 15 12 - 3 29 54 - 3 11 42 -0.38 -120 0 0 - 3 27 20 2 12 39.0 65 221 -6 - 3 32 56 - 3 21 44 - 3 36 25 - 3 18 14 -0.38 -119 0 0 - 3 33 23 2 12 43.9 65 223 -7 - 3 38 58 - 3 27 47 - 3 42 28 - 3 24 17 -0.38 -118 0 0 - 3 38 57 2 12 48.8 64 224 -8 - 3 44 32 - 3 33 21 - 3 48 1 - 3 29 52 -0.38 -117 0 0 - 3 44 1 2 12 53.7 64 226 -9 - 3 49 36 - 3 38 26 - 3 53 5 - 3 34 57 -0.38 -116 0 0 - 3 48 37 2 12 58.5 63 227 -10 - 3 54 11 - 3 43 2 - 3 57 41 - 3 39 33 -0.38 -115 0 0 - 3 52 43 2 13 3.3 62 228 -11 - 3 58 18 - 3 47 9 - 4 1 47 - 3 43 39 -0.38 -114 0 0 - 3 56 21 2 13 8.1 61 230 -12 - 4 1 55 - 3 50 46 - 4 5 24 - 3 47 17 -0.38 -113 0 0 - 3 59 29 2 13 12.8 61 231 -13 - 4 5 3 - 3 53 55 - 4 8 32 - 3 50 26 -0.38 -112 0 0 - 4 2 8 2 13 17.5 60 232 -14 - 4 7 42 - 3 56 34 - 4 11 11 - 3 53 5 -0.38 -111 0 0 - 4 4 18 2 13 22.1 59 233 -15 - 4 9 52 - 3 58 44 - 4 13 21 - 3 55 15 -0.38 -110 0 0 - 4 5 59 2 13 26.7 58 234 -16 - 4 11 33 - 4 0 25 - 4 15 2 - 3 56 56 -0.38 -109 0 0 - 4 7 11 2 13 31.3 58 235 -17 - 4 12 45 - 4 1 37 - 4 16 13 - 3 58 8 -0.38 -108 0 0 - 4 7 54 2 13 35.8 57 236 -18 - 4 13 27 - 4 2 20 - 4 16 56 - 3 58 51 -0.38 -107 0 0 - 4 8 7 2 13 40.3 56 237 -19 - 4 13 41 - 4 2 33 - 4 17 9 - 3 59 4 -0.38 -106 0 0 - 4 7 51 2 13 44.7 55 237 -20 - 4 13 25 - 4 2 18 - 4 16 54 - 3 58 49 -0.38 -105 0 0 - 4 7 7 2 13 49.1 54 238 -21 - 4 12 40 - 4 1 33 - 4 16 9 - 3 58 4 -0.38 -104 0 0 - 4 5 53 2 13 53.5 53 239 -22 - 4 11 27 - 4 0 19 - 4 14 55 - 3 56 50 -0.38 -103 0 0 - 4 4 10 2 13 57.7 52 239 -23 - 4 9 44 - 3 58 36 - 4 13 13 - 3 55 7 -0.38 -102 0 0 - 4 1 59 2 14 2.0 51 240 -24 - 4 7 32 - 3 56 25 - 4 11 1 - 3 52 55 -0.38 -101 0 0 - 3 59 18 2 14 6.2 51 240 -25 - 4 4 52 - 3 53 44 - 4 8 21 - 3 50 14 -0.38 -100 0 0 - 3 56 8 2 14 10.3 50 241 -26 - 4 1 42 - 3 50 34 - 4 5 11 - 3 47 5 -0.38 - 99 0 0 - 3 52 30 2 14 14.4 49 241 -27 - 3 58 4 - 3 46 55 - 4 1 33 - 3 43 26 -0.38 - 98 0 0 - 3 48 22 2 14 18.4 48 242 -28 - 3 53 57 - 3 42 48 - 3 57 26 - 3 39 18 -0.38 - 97 0 0 - 3 43 46 2 14 22.4 47 242 -29 - 3 49 21 - 3 38 11 - 3 52 50 - 3 34 42 -0.38 - 96 0 0 - 3 38 41 2 14 26.3 46 242 -30 - 3 44 16 - 3 33 6 - 3 47 45 - 3 29 36 -0.38 - 95 0 0 - 3 33 7 2 14 30.1 45 243 -31 - 3 38 42 - 3 27 32 - 3 42 12 - 3 24 2 -0.38 - 94 0 0 - 3 27 5 2 14 33.9 44 243 -32 - 3 32 40 - 3 21 30 - 3 36 10 - 3 18 0 -0.37 - 93 0 0 - 3 20 34 2 14 37.6 43 243 -33 - 3 26 10 - 3 14 59 - 3 29 40 - 3 11 28 -0.37 - 92 0 0 - 3 13 35 2 14 41.3 42 243 -34 - 3 19 11 - 3 7 59 - 3 22 41 - 3 4 28 -0.37 - 91 0 0 - 3 6 7 2 14 44.9 41 244 -35 - 3 11 43 - 3 0 31 - 3 15 13 - 2 57 0 -0.37 - 90 0 0 - 2 58 11 2 14 48.4 40 244 -36 - 3 3 47 - 2 52 34 - 3 7 18 - 2 49 3 -0.37 - 89 0 0 - 2 49 46 2 14 51.9 39 244 -37 - 2 55 23 - 2 44 10 - 2 58 54 - 2 40 38 -0.37 - 88 0 0 - 2 40 54 2 14 55.3 38 244 -38 - 2 46 31 - 2 35 17 - 2 50 2 - 2 31 45 -0.37 - 87 0 0 - 2 31 33 2 14 58.6 37 245 -39 - 2 37 11 - 2 25 56 - 2 40 42 - 2 22 24 -0.37 - 86 0 0 - 2 21 45 2 15 1.9 36 245 -40 - 2 27 23 - 2 16 7 - 2 30 54 - 2 12 35 -0.37 - 85 0 0 - 2 11 28 2 15 5.1 35 245 -41 - 2 17 6 - 2 5 50 - 2 20 38 - 2 2 18 -0.37 - 84 0 0 - 2 0 44 2 15 8.2 34 245 -42 - 2 6 23 - 1 55 5 - 2 9 55 - 1 51 33 -0.37 - 83 0 0 - 1 49 32 2 15 11.2 33 245 -43 - 1 55 11 - 1 43 53 - 1 58 43 - 1 40 20 -0.37 - 82 0 0 - 1 37 53 2 15 14.2 32 245 -44 - 1 43 32 - 1 32 13 - 1 47 5 - 1 28 40 -0.37 - 81 0 0 - 1 25 46 2 15 17.0 31 245 -45 - 1 31 26 - 1 20 6 - 1 34 59 - 1 16 33 -0.37 - 80 0 0 - 1 13 12 2 15 19.9 30 246 -46 - 1 18 53 - 1 7 31 - 1 22 26 - 1 3 58 -0.37 - 79 0 0 - 1 0 11 2 15 22.6 29 246 -47 - 1 5 52 - 0 54 30 - 1 9 26 - 0 50 56 -0.37 - 78 0 0 - 0 46 44 2 15 25.2 28 246 -48 - 0 52 25 - 0 41 2 - 0 55 59 - 0 37 28 -0.37 - 77 0 0 - 0 32 49 2 15 27.8 27 246 -49 - 0 38 31 - 0 27 7 - 0 42 5 - 0 23 32 -0.37 - 76 0 0 - 0 18 28 2 15 30.3 26 246 -50 - 0 24 11 - 0 12 45 - 0 27 45 - 0 9 10 -0.37 - 75 0 0 - 0 3 41 2 15 32.7 25 246 -51 - 0 9 24 0 2 3 - 0 12 59 0 5 38 -0.37 - 74 0 0 0 11 33 2 15 35.0 24 246 -53 0 5 49 0 17 17 0 2 14 0 20 52 -0.37 - 73 0 0 0 27 12 2 15 37.2 23 246 -54 0 21 28 0 32 57 0 17 52 0 36 33 -0.37 - 72 0 0 0 43 17 2 15 39.3 22 246 -55 0 37 32 0 49 2 0 33 56 0 52 39 -0.37 - 71 0 0 0 59 48 2 15 41.4 21 246 -56 0 54 2 1 5 33 0 50 26 1 9 10 -0.37 - 70 0 0 1 16 43 2 15 43.3 20 246 -57 1 10 57 1 22 30 1 7 20 1 26 7 -0.37 - 69 0 0 1 34 4 2 15 45.2 19 246 -58 1 28 17 1 39 51 1 24 40 1 43 28 -0.37 - 68 0 0 1 51 49 2 15 46.9 18 247 -59 1 46 1 1 57 36 1 42 24 2 1 14 -0.37 - 67 0 0 2 9 58 2 15 48.6 17 247 -60 2 4 10 2 15 47 2 0 32 2 19 25 -0.37 - 66 0 0 2 28 32 2 15 50.2 16 247 -61 2 22 43 2 34 21 2 19 5 2 37 59 -0.37 - 65 0 0 2 47 29 2 15 51.7 15 247 -62 2 41 39 2 53 18 2 38 1 2 56 57 -0.37 - 64 0 0 3 6 49 2 15 53.1 14 247 -63 3 0 59 3 12 40 2 57 20 3 16 19 -0.37 - 63 0 0 3 26 33 2 15 54.3 13 247 -64 3 20 42 3 32 24 3 17 3 3 36 4 -0.37 - 62 0 0 3 46 39 2 15 55.5 12 247 -65 3 40 48 3 52 31 3 37 8 3 56 11 -0.37 - 61 0 0 4 7 8 2 15 56.6 11 247 -66 4 1 16 4 13 0 3 57 35 4 16 40 -0.37 - 60 0 0 4 27 58 2 15 57.6 10 247 -67 4 22 5 4 33 51 4 18 25 4 37 32 -0.37 - 59 0 0 4 49 10 2 15 58.5 9 247 -68 4 43 17 4 55 3 4 39 36 4 58 45 -0.37 - 58 0 0 5 10 43 2 15 59.3 8 247 -69 5 4 49 5 16 37 5 1 7 5 20 19 -0.38 - 57 0 0 5 32 36 2 16 0.0 6 247 -70 5 26 42 5 38 31 5 23 0 5 42 13 -0.38 - 56 0 0 5 54 50 2 16 0.5 5 248 -71 5 48 55 6 0 46 5 45 13 6 4 28 -0.38 - 55 0 0 6 17 23 2 16 1.0 4 248 -73 6 11 28 6 23 20 6 7 45 6 27 3 -0.38 - 54 0 0 6 40 16 2 16 1.4 3 248 -74 6 34 20 6 46 13 6 30 36 6 49 56 -0.39 - 53 0 0 7 3 27 2 16 1.7 2 248 -75 6 57 30 7 9 25 6 53 47 7 13 9 -0.39 - 52 0 0 7 26 57 2 16 1.8 1 248 -76 7 20 59 7 32 55 7 17 15 7 36 39 -0.42 - 51 0 0 7 50 44 2 16 1.9 0 248 -77 7 44 46 7 56 43 7 41 2 8 0 28 -1.33 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 342-170965 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 55 27.1718 DE: -21 37 33.805 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 55 27.1718 DE: -21 37 33.805 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 13.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (49513) 1999 CK28 asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.29220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.021", 0.001", 107.825° remarks: * orbital elements for (49513)1999 CK28 : Mean anomaly = 268.9264342527 deg Arg. of pericenter = 276.5740744047 deg Long. of node = 123.3776473924 deg Inclination = 22.5363014203 deg Eccentricity = 0.0762727958 Semimajor axis = 3.1954031478 AU Perihelion dist = 2.9516808160 AU Mag: H = 12.85, G = 0.15 Epoch of elements : MJD 60602.09138263 TDT (2024 Oct 19.0914) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr25,0.86,2024,10,19,2.193186,0.073019,0.342508,12.379639,-2.652150,0.005682,0.000583,0.000000,0.000000 -136.7169,-21.5952,143.34,-10.11,False UCAC4 342-170965,18.92421441,-21.6260569,13.02,11.89,11.28,0.1,0,,18.94879169,-21.5951771,7.01,7.17,0,0,0 49513,1999 CK28,18.90,19.206,3.2922,0,0,2.371,-7.08,,1.8,0 0,268.9107,2024,10,19,276.5741,123.3776,22.5363,0.07627,3.19540,2.95168,12.85,5.0,0.15 1.313,0.0210,0.0014,108,0.0025,Known errors,0.98,0,-1,-1 20241019_170965,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org