IOTA/IOTA-ES occultation update for (2928) Epstein / UCAC4 326-178931 event on 2024 Oct 20, 11:36 UT Visible from Summary ------- On 2024 Oct 20 UT, the 16.5381366456609 km diameter asteroid (2928) Epstein will occult a 11.8 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 5.98 mag to 17.75 mag (the magnitude of the asteroid) for at most 0.690 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: 97 * date and approx. time of event: 2024 Oct 20, 11:33 - 2024 Oct 20, 11:38 * geocentric midpoint of event [JD]: 2460603.98347575 * magnitude of target star: 11.77 * magnitude drop [mag]: 5.98 * estimated maximum duration [s]: 0.690 * Moon: 88 % sunlit, 147° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 75°) * approx speed of asteroid's shadow [km/s]: 24.2430 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 326-178931 by 2928 Epstein on 2024 Oct 20 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 10 0 0 36 17 49 11 33 37.2 0 122 43 36 8 53 36 26 48 36 1 42 36 34 4 .... 11 0 0 35 48 36 11 33 37.3 1 122 43 35 39 43 35 57 31 35 32 35 36 4 43 -0.71 12 0 0 35 20 0 11 33 37.5 2 123 43 35 11 11 35 28 51 35 4 6 35 36 1 -0.97 13 0 0 34 52 3 11 33 37.9 3 124 44 34 43 17 35 0 50 34 36 15 35 7 57 -1.08 14 0 0 34 24 44 11 33 38.3 4 124 44 34 16 2 34 33 28 34 9 3 34 40 32 -1.14 15 0 0 33 58 5 11 33 38.9 5 125 44 33 49 26 34 6 45 33 42 30 34 13 46 -1.18 16 0 0 33 32 5 11 33 39.6 6 125 44 33 23 30 33 40 43 33 16 36 33 47 41 -1.21 17 0 0 33 6 47 11 33 40.5 7 126 44 32 58 14 33 15 21 32 51 23 33 22 16 -1.23 18 0 0 32 42 9 11 33 41.4 8 126 44 32 33 39 32 50 40 32 26 51 32 57 33 -1.25 19 0 0 32 18 12 11 33 42.4 9 127 44 32 9 46 32 26 40 32 2 59 32 33 31 -1.26 20 0 0 31 54 57 11 33 43.6 10 127 44 31 46 34 32 3 22 31 39 50 32 10 10 -1.27 21 0 0 31 32 24 11 33 44.9 11 128 44 31 24 4 31 40 46 31 17 22 31 47 32 -1.28 22 0 0 31 10 34 11 33 46.3 12 129 44 31 2 16 31 18 54 30 55 36 31 25 37 -1.29 23 0 0 30 49 26 11 33 47.8 12 129 44 30 41 11 30 57 44 30 34 34 31 4 25 -1.29 24 0 0 30 29 2 11 33 49.4 13 130 44 30 20 49 30 37 17 30 14 14 30 43 56 -1.30 25 0 0 30 9 21 11 33 51.1 14 130 44 30 1 11 30 17 33 29 54 37 30 24 11 -1.30 26 0 0 29 50 24 11 33 52.9 15 131 44 29 42 16 29 58 34 29 35 44 30 5 9 -1.31 27 0 0 29 32 10 11 33 54.9 16 132 44 29 24 4 29 40 18 29 17 34 29 46 52 -1.31 28 0 0 29 14 41 11 33 56.9 17 132 43 29 6 37 29 22 47 29 0 9 29 29 19 -1.32 29 0 0 28 57 56 11 33 59.0 18 133 43 28 49 54 29 6 0 28 43 27 29 12 30 -1.32 30 0 0 28 41 56 11 34 1.2 18 133 43 28 33 56 28 49 58 28 27 30 28 56 27 -1.32 31 0 0 28 26 40 11 34 3.5 19 134 42 28 18 42 28 34 40 28 12 18 28 41 8 -1.32 32 0 0 28 12 9 11 34 5.9 20 135 42 28 4 13 28 20 7 27 57 50 28 26 34 -1.33 33 0 0 27 58 24 11 34 8.4 21 135 42 27 50 29 28 6 20 27 44 7 28 12 45 -1.33 34 0 0 27 45 23 11 34 11.0 22 136 41 27 37 30 27 53 18 27 31 9 27 59 42 -1.33 35 0 0 27 33 8 11 34 13.7 22 137 41 27 25 16 27 41 2 27 18 57 27 47 24 -1.33 36 0 0 27 21 38 11 34 16.5 23 137 40 27 13 47 27 29 31 27 7 29 27 35 52 -1.34 37 0 0 27 10 54 11 34 19.3 24 138 40 27 3 4 27 18 45 26 56 47 27 25 6 -1.34 38 0 0 27 0 56 11 34 22.2 25 139 39 26 53 7 27 8 46 26 46 51 27 15 5 -1.34 39 0 0 26 51 43 11 34 25.3 25 139 39 26 43 56 26 59 32 26 37 40 27 5 51 -1.34 40 0 0 26 43 16 11 34 28.3 26 140 38 26 35 30 26 51 4 26 29 15 26 57 22 -1.34 41 0 0 26 35 35 11 34 31.5 27 141 37 26 27 50 26 43 23 26 21 36 26 49 40 -1.34 42 0 0 26 28 41 11 34 34.7 27 142 37 26 20 56 26 36 27 26 14 42 26 42 44 -1.35 43 0 0 26 22 32 11 34 38.0 28 143 36 26 14 48 26 30 18 26 8 35 26 36 34 -1.35 44 0 0 26 17 10 11 34 41.4 29 143 35 26 9 26 26 24 55 26 3 14 26 31 10 -1.35 45 0 0 26 12 33 11 34 44.8 29 144 35 26 4 50 26 20 18 25 58 38 26 26 33 -1.35 46 0 0 26 8 43 11 34 48.3 30 145 34 26 1 1 26 16 28 25 54 49 26 22 43 -1.35 47 0 0 26 5 40 11 34 51.9 30 146 33 25 57 58 26 13 24 25 51 46 26 19 38 -1.35 48 0 0 26 3 23 11 34 55.5 31 147 33 25 55 41 26 11 6 25 49 29 26 17 21 -1.35 49 0 0 26 1 52 11 34 59.2 31 148 32 25 54 10 26 9 36 25 47 59 26 15 50 -1.35 50 0 0 26 1 8 11 35 2.9 32 149 31 25 53 26 26 8 51 25 47 15 26 15 6 -1.36 51 0 0 26 1 10 11 35 6.7 32 149 30 25 53 28 26 8 53 25 47 17 26 15 8 -1.36 52 0 0 26 1 59 11 35 10.5 33 150 29 25 54 16 26 9 42 25 48 5 26 15 57 -1.36 53 0 0 26 3 34 11 35 14.4 33 151 29 25 55 51 26 11 17 25 49 40 26 17 32 -1.36 54 0 0 26 5 55 11 35 18.3 34 152 28 25 58 12 26 13 39 25 52 1 26 19 54 -1.36 55 0 0 26 9 3 11 35 22.2 34 153 27 26 1 20 26 16 48 25 55 8 26 23 3 -1.36 56 0 0 26 12 58 11 35 26.2 34 154 26 26 5 14 26 20 43 25 59 2 26 26 59 -1.36 57 0 0 26 17 39 11 35 30.3 35 155 25 26 9 55 26 25 25 26 3 42 26 31 41 -1.36 58 0 0 26 23 7 11 35 34.3 35 157 25 26 15 22 26 30 53 26 9 9 26 37 10 -1.36 59 0 0 26 29 22 11 35 38.4 35 158 24 26 21 36 26 37 9 26 15 22 26 43 26 -1.36 60 0 0 26 36 23 11 35 42.6 35 159 23 26 28 36 26 44 11 26 22 22 26 50 29 -1.36 61 0 0 26 44 10 11 35 46.7 36 160 22 26 36 23 26 51 59 26 30 8 26 58 18 -1.36 62 0 0 26 52 45 11 35 50.9 36 161 21 26 44 56 27 0 35 26 38 40 27 6 54 -1.36 63 0 0 27 2 6 11 35 55.1 36 162 20 26 54 16 27 9 57 26 47 59 27 16 17 -1.36 64 0 0 27 12 13 11 35 59.3 36 163 19 27 4 22 27 20 5 26 58 4 27 26 27 -1.36 65 0 0 27 23 6 11 36 3.5 36 164 18 27 15 14 27 31 0 27 8 55 27 37 23 -1.36 66 0 0 27 34 46 11 36 7.8 36 165 17 27 26 53 27 42 42 27 20 32 27 49 5 -1.37 67 0 0 27 47 13 11 36 12.0 36 167 17 27 39 18 27 55 10 27 32 56 28 1 35 -1.37 68 0 0 28 0 26 11 36 16.3 36 168 16 27 52 29 28 8 24 27 46 6 28 14 50 -1.37 69 0 0 28 14 24 11 36 20.5 36 169 15 28 6 26 28 22 24 28 0 2 28 28 52 -1.37 70 0 0 28 29 9 11 36 24.8 36 170 14 28 21 9 28 37 11 28 14 43 28 43 40 -1.37 71 0 0 28 44 40 11 36 29.0 36 171 13 28 36 38 28 52 44 28 30 11 28 59 15 -1.37 72 0 0 29 0 57 11 36 33.3 36 172 12 28 52 52 29 9 2 28 46 24 29 15 35 -1.37 73 0 0 29 17 59 11 36 37.5 36 174 11 29 9 52 29 26 6 29 3 22 29 32 41 -1.37 74 0 0 29 35 46 11 36 41.7 35 175 10 29 27 38 29 43 56 29 21 6 29 50 32 -1.37 75 0 0 29 54 19 11 36 45.9 35 176 9 29 46 8 30 2 32 29 39 34 30 9 9 -1.37 76 0 0 30 13 37 11 36 50.1 35 177 8 30 5 24 30 21 52 29 58 48 30 28 32 -1.37 77 0 0 30 33 40 11 36 54.3 35 178 7 30 25 24 30 41 57 30 18 46 30 48 39 -1.37 78 0 0 30 54 27 11 36 58.4 34 179 6 30 46 9 31 2 47 30 39 29 31 9 31 -1.37 79 0 0 31 15 58 11 37 2.6 34 180 5 31 7 37 31 24 21 31 0 55 31 31 7 -1.37 80 0 0 31 38 15 11 37 6.6 34 181 4 31 29 51 31 46 40 31 23 6 31 53 29 -1.37 81 0 0 32 1 15 11 37 10.7 33 183 3 31 52 48 32 9 43 31 46 1 32 16 34 -1.37 82 0 0 32 24 58 11 37 14.7 33 184 3 32 16 28 32 33 30 32 9 39 32 40 23 -1.37 83 0 0 32 49 24 11 37 18.6 32 185 2 32 40 52 32 57 59 32 34 0 33 4 55 -1.37 84 0 0 33 14 34 11 37 22.5 32 186 1 33 5 58 33 23 12 32 59 3 33 30 10 -1.37 85 0 0 33 40 25 11 37 26.4 31 187 0 33 31 46 33 49 6 33 24 49 33 56 8 -1.37 86 0 0 34 6 58 11 37 30.2 31 188 -1 33 58 15 34 15 43 33 51 16 34 22 47 -1.37 87 0 0 34 34 13 11 37 34.0 30 189 -2 34 25 26 34 43 1 34 18 24 34 50 8 -1.37 88 0 0 35 2 8 11 37 37.7 30 190 -3 34 53 18 35 11 0 34 46 12 35 18 10 -1.37 89 0 0 35 30 43 11 37 41.3 29 191 -4 35 21 49 35 39 39 35 14 41 35 46 53 -1.37 90 0 0 35 59 58 11 37 44.9 28 192 -5 35 51 0 36 8 58 35 43 49 36 16 15 -1.37 91 0 0 36 29 52 11 37 48.3 28 193 -6 36 20 50 36 38 56 36 13 35 36 46 16 -1.37 92 0 0 37 0 24 11 37 51.8 27 194 -7 36 51 18 37 9 32 36 44 0 37 16 55 -1.37 93 0 0 37 31 33 11 37 55.1 26 195 -7 37 22 23 37 40 46 37 15 2 37 48 13 -1.37 94 0 0 38 3 19 11 37 58.3 26 196 -8 37 54 5 38 12 36 37 46 40 38 20 6 -1.37 95 0 0 38 35 40 11 38 1.5 25 197 -9 38 26 22 38 45 1 38 18 53 38 52 35 -1.37 96 0 0 39 8 36 11 38 4.6 24 197 -10 38 59 13 39 18 2 38 51 41 39 25 40 -1.37 97 0 0 39 42 7 11 38 7.6 23 198 -11 39 32 39 39 51 37 39 25 3 39 59 19 -1.37 98 0 0 40 16 10 11 38 10.5 22 199 -12 40 6 37 40 25 45 39 58 58 40 33 30 -1.37 99 0 0 40 50 44 11 38 13.3 22 200 -12 40 41 7 41 0 24 40 33 24 41 8 14 -1.37 100 0 0 41 25 50 11 38 16.0 21 201 -13 41 16 7 41 35 35 41 8 20 41 43 28 -1.37 101 0 0 42 1 24 11 38 18.6 20 202 -14 41 51 37 42 11 14 41 43 46 42 19 12 -1.37 102 0 0 42 37 27 11 38 21.1 19 203 -15 42 27 35 42 47 22 42 19 40 42 55 24 -1.37 103 0 0 43 13 57 11 38 23.5 18 204 -16 43 3 59 43 23 57 42 56 0 43 32 3 -1.37 104 0 0 43 50 52 11 38 25.8 17 204 -16 43 40 49 44 0 58 43 32 46 44 9 8 -1.37 105 0 0 44 28 12 11 38 27.9 17 205 -17 44 18 4 44 38 23 44 9 56 44 46 38 -1.38 106 0 0 45 5 54 11 38 30.0 16 206 -18 44 55 40 45 16 11 44 47 29 45 24 30 -1.38 107 0 0 45 43 57 11 38 31.9 15 207 -18 45 33 38 45 54 19 45 25 22 46 2 43 -1.38 108 0 0 46 22 20 11 38 33.7 14 208 -19 46 11 55 46 32 48 46 3 35 46 41 16 -1.38 109 0 0 47 1 0 11 38 35.5 13 208 -20 46 50 30 47 11 34 46 42 6 47 20 7 -1.38 110 0 0 47 39 57 11 38 37.0 12 209 -20 47 29 22 47 50 36 47 20 52 47 59 14 -1.38 111 0 0 48 19 8 11 38 38.5 11 210 -21 48 8 27 48 29 53 47 59 54 48 38 35 -1.38 112 0 0 48 58 32 11 38 39.9 10 211 -21 48 47 45 49 9 23 48 39 7 49 18 9 -1.39 113 0 0 49 38 6 11 38 41.1 9 212 -22 49 27 14 49 49 3 49 18 31 49 57 54 -1.39 114 0 0 50 17 49 11 38 42.2 9 212 -22 50 6 51 50 28 52 49 58 4 50 37 48 -1.39 115 0 0 50 57 39 11 38 43.2 8 213 -23 50 46 36 51 8 47 50 37 44 51 17 48 -1.40 116 0 0 51 37 34 11 38 44.1 7 214 -23 51 26 25 51 48 47 51 17 29 51 57 53 -1.40 117 0 0 52 17 31 11 38 44.9 6 215 -24 52 6 16 52 28 50 51 57 16 52 38 1 -1.41 118 0 0 52 57 29 11 38 45.5 5 216 -24 52 46 9 53 8 54 52 37 4 53 18 9 -1.42 119 0 0 53 37 26 11 38 46.1 4 216 -25 53 26 0 53 48 56 53 16 51 53 58 16 -1.43 120 0 0 54 17 18 11 38 46.5 3 217 -25 54 5 47 54 28 54 53 56 34 54 38 18 -1.45 121 0 0 54 57 5 11 38 46.8 2 218 -25 54 45 29 55 8 47 54 36 12 55 18 15 -1.48 122 0 0 55 36 44 11 38 47.0 1 219 -26 55 25 3 55 48 31 55 15 41 55 58 3 -1.56 123 0 0 56 16 13 11 38 47.1 1 220 -26 56 4 27 56 28 5 55 55 1 56 37 42 -1.84 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 326-178931 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 48 01.0354 DE: -24 54 58.894 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 48 01.0354 DE: -24 54 58.894 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2928) Epstein asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.33480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.013", 0.003", 75.122° remarks: * orbital elements for (2928)Epstein : Mean anomaly = 192.1935150164 deg Arg. of pericenter = 157.0634903246 deg Long. of node = 310.3093141083 deg Inclination = 9.5417500198 deg Eccentricity = 0.0656473194 Semimajor axis = 3.0071193751 AU Perihelion dist = 2.8097100492 AU Mag: H = 11.69, G = 0.15 Epoch of elements : MJD 60603.48347542 TDT (2024 Oct 20.4835) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,0.69,2024,10,20,11.603418,-0.181584,0.785209,13.333099,3.076484,0.005622,0.000423,0.000000,0.000000 78.9079,-24.8901,2.13,-10.61,False UCAC4 326-178931,18.80028764,-24.9163593,12.78,11.77,11.22,0.1,0,K,18.82548474,-24.8901138,5.98,6.08,0,0,0 2928,Epstein,17.75,16.780,3.3348,0,0,2.585,8.12,,1.8,0 0,192.1021,2024,10,20,157.0635,310.3093,9.5418,0.06565,3.00712,2.80971,11.69,5.0,0.15 1.403,0.0130,0.0028,75,0.0028,Known errors,0.86,0,-1,-1 20241020_178931,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org