IOTA/IOTA-ES occultation update for (20236) 1998 BZ7 / UCAC4 316-214147 event on 2024 Oct 02, 20:23 UT Visible from Summary ------- On 2024 Oct 02 UT, the 0.907921348779772 km diameter asteroid (20236) 1998 BZ7 will occult a 13.2 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 7.58 mag to 20.75 mag (the magnitude of the asteroid) for at most 0.040 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: 3 * date and approx. time of event: 2024 Oct 02, 20:21 - 2024 Oct 02, 20:26 * geocentric midpoint of event [JD]: 2460586.34998146 * magnitude of target star: 13.17 * magnitude drop [mag]: 7.58 * estimated maximum duration [s]: 0.040 * Moon: 0 % sunlit, 90° distance * Sun: 90° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 22.18 * 1 sigma uncertainty interval [seconds]: +/- 9.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.277, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.277", 0.021", 90°) * approx speed of asteroid's shadow [km/s]: 25.9388 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 316-214147 by 20236 1998 BZ7 on 2024 Oct 2 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 - 96 0 0 43 50 27 20 21 31.6 0 129 34 43 49 53 43 51 2 43 23 15 44 18 2 .... - 95 0 0 43 15 38 20 21 31.7 1 130 34 43 15 4 43 16 12 42 48 38 43 43 0 -0.64 - 94 0 0 42 41 10 20 21 31.9 2 131 34 42 40 36 42 41 44 42 14 22 43 8 19 -0.92 - 93 0 0 42 7 5 20 21 32.2 3 131 34 42 6 31 42 7 39 41 40 29 42 34 2 -1.04 - 92 0 0 41 33 24 20 21 32.6 4 132 34 41 32 50 41 33 58 41 7 0 42 0 9 -1.11 - 91 0 0 41 0 8 20 21 33.2 5 133 34 40 59 35 41 0 41 40 33 55 41 26 41 -1.15 - 90 0 0 40 27 18 20 21 33.8 6 133 34 40 26 45 40 27 51 40 1 17 40 53 39 -1.18 - 89 0 0 39 54 56 20 21 34.5 7 134 33 39 54 23 39 55 28 39 29 5 40 21 5 -1.20 - 88 0 0 39 23 1 20 21 35.4 8 135 33 39 22 29 39 23 34 38 57 22 39 48 59 -1.21 - 87 0 0 38 51 37 20 21 36.3 9 135 33 38 51 4 38 52 9 38 26 8 39 17 24 -1.23 - 86 0 0 38 20 42 20 21 37.4 10 136 33 38 20 10 38 21 15 37 55 25 38 46 18 -1.24 - 85 0 0 37 50 19 20 21 38.6 11 137 32 37 49 47 37 50 51 37 25 12 38 15 44 -1.25 - 84 0 0 37 20 28 20 21 39.9 11 137 32 37 19 57 37 21 0 36 55 31 37 45 43 -1.25 - 83 0 0 36 51 10 20 21 41.3 12 138 31 36 50 39 36 51 42 36 26 23 37 16 14 -1.26 - 82 0 0 36 22 26 20 21 42.7 13 139 31 36 21 55 36 22 57 35 57 48 36 47 20 -1.27 - 81 0 0 35 54 16 20 21 44.3 14 139 31 35 53 45 35 54 47 35 29 48 36 19 0 -1.27 - 80 0 0 35 26 41 20 21 46.0 15 140 30 35 26 10 35 27 12 35 2 22 35 51 16 -1.28 - 79 0 0 34 59 42 20 21 47.8 16 141 30 34 59 12 35 0 13 34 35 32 35 24 8 -1.28 - 78 0 0 34 33 20 20 21 49.7 17 141 29 34 32 50 34 33 51 34 9 19 34 57 37 -1.28 - 77 0 0 34 7 35 20 21 51.7 18 142 29 34 7 4 34 8 5 33 43 42 34 31 42 -1.29 - 76 0 0 33 42 27 20 21 53.8 18 143 28 33 41 57 33 42 57 33 18 43 34 6 26 -1.29 - 75 0 0 33 17 58 20 21 55.9 19 143 27 33 17 28 33 18 28 32 54 21 33 41 48 -1.29 - 74 0 0 32 54 7 20 21 58.2 20 144 27 32 53 37 32 54 36 32 30 38 33 17 49 -1.29 - 73 0 0 32 30 55 20 22 0.5 21 145 26 32 30 25 32 31 24 32 7 34 32 54 30 -1.30 - 72 0 0 32 8 22 20 22 3.0 22 145 26 32 7 53 32 8 52 31 45 9 32 31 50 -1.30 - 71 0 0 31 46 30 20 22 5.5 23 146 25 31 46 0 31 46 59 31 23 23 32 9 50 -1.30 - 70 0 0 31 25 18 20 22 8.1 23 147 24 31 24 48 31 25 47 31 2 18 31 48 31 -1.30 - 69 0 0 31 4 46 20 22 10.7 24 148 24 31 4 17 31 5 15 30 41 53 31 27 52 -1.31 - 68 0 0 30 44 55 20 22 13.5 25 148 23 30 44 27 30 45 24 30 22 9 31 7 55 -1.31 - 67 0 0 30 25 46 20 22 16.3 26 149 22 30 25 17 30 26 15 30 3 6 30 48 40 -1.31 - 66 0 0 30 7 19 20 22 19.2 26 150 21 30 6 50 30 7 47 29 44 44 30 30 6 -1.31 - 65 0 0 29 49 33 20 22 22.2 27 151 21 29 49 5 29 50 2 29 27 4 30 12 15 -1.31 - 64 0 0 29 32 30 20 22 25.2 28 152 20 29 32 1 29 32 58 29 10 6 29 55 5 -1.31 - 63 0 0 29 16 8 20 22 28.3 28 153 19 29 15 40 29 16 37 28 53 50 29 38 39 -1.32 - 62 0 0 29 0 30 20 22 31.5 29 153 18 29 0 2 29 0 58 28 38 16 29 22 55 -1.32 - 61 0 0 28 45 34 20 22 34.7 29 154 18 28 45 6 28 46 2 28 23 25 29 7 55 -1.32 - 60 0 0 28 31 21 20 22 38.0 30 155 17 28 30 53 28 31 49 28 9 17 28 53 38 -1.32 - 59 0 0 28 17 52 20 22 41.3 31 156 16 28 17 24 28 18 20 27 55 52 28 40 4 -1.32 - 58 0 0 28 5 5 20 22 44.7 31 157 15 28 4 38 28 5 33 27 43 9 28 27 13 -1.32 - 57 0 0 27 53 3 20 22 48.1 32 158 14 27 52 35 27 53 30 27 31 10 28 15 6 -1.32 - 56 0 0 27 41 43 20 22 51.6 32 159 14 27 41 15 27 42 11 27 19 54 28 3 43 -1.32 - 55 0 0 27 31 7 20 22 55.1 33 160 13 27 30 40 27 31 35 27 9 22 27 53 4 -1.33 - 54 0 0 27 21 16 20 22 58.7 33 161 12 27 20 48 27 21 43 26 59 33 27 43 9 -1.33 - 53 0 0 27 12 8 20 23 2.3 34 162 11 27 11 40 27 12 35 26 50 28 27 33 59 -1.33 - 52 0 0 27 3 43 20 23 5.9 34 163 10 27 3 16 27 4 11 26 42 6 27 25 32 -1.33 - 51 0 0 26 56 4 20 23 9.6 34 164 9 26 55 36 26 56 31 26 34 29 27 17 49 -1.33 - 50 0 0 26 49 8 20 23 13.3 35 165 8 26 48 40 26 49 35 26 27 35 27 10 51 -1.33 - 49 0 0 26 42 56 20 23 17.1 35 166 7 26 42 29 26 43 23 26 21 25 27 4 38 -1.33 - 48 0 0 26 37 29 20 23 20.9 35 167 7 26 37 1 26 37 56 26 15 59 26 59 9 -1.33 - 47 0 0 26 32 46 20 23 24.7 36 168 6 26 32 18 26 33 13 26 11 18 26 54 24 -1.33 - 46 0 0 26 28 47 20 23 28.5 36 169 5 26 28 20 26 29 14 26 7 20 26 50 24 -1.33 - 45 0 0 26 25 32 20 23 32.3 36 170 4 26 25 5 26 26 0 26 4 7 26 47 9 -1.33 - 44 0 0 26 23 3 20 23 36.2 36 171 3 26 22 35 26 23 30 26 1 38 26 44 38 -1.33 - 43 0 0 26 21 17 20 23 40.1 36 172 2 26 20 50 26 21 44 25 59 53 26 42 52 -1.34 - 42 0 0 26 20 16 20 23 43.9 37 174 1 26 19 49 26 20 43 25 58 52 26 41 51 -1.34 - 41 0 0 26 20 0 20 23 47.8 37 175 0 26 19 33 26 20 27 25 58 36 26 41 34 -1.34 - 40 0 0 26 20 28 20 23 51.7 37 176 -1 26 20 1 26 20 55 25 59 4 26 42 3 -1.34 - 39 0 0 26 21 40 20 23 55.7 37 177 -2 26 21 13 26 22 7 26 0 16 26 43 15 -1.34 - 38 0 0 26 23 37 20 23 59.6 37 178 -2 26 23 10 26 24 4 26 2 12 26 45 13 -1.34 - 37 0 0 26 26 19 20 24 3.5 37 179 -3 26 25 51 26 26 46 26 4 53 26 47 55 -1.34 - 36 0 0 26 29 45 20 24 7.4 37 180 -4 26 29 17 26 30 12 26 8 18 26 51 22 -1.34 - 35 0 0 26 33 55 20 24 11.3 37 182 -5 26 33 28 26 34 22 26 12 27 26 55 34 -1.34 - 34 0 0 26 38 50 20 24 15.2 37 183 -6 26 38 22 26 39 17 26 17 20 27 0 30 -1.34 - 33 0 0 26 44 29 20 24 19.1 36 184 -7 26 44 1 26 44 56 26 22 57 27 6 11 -1.34 - 32 0 0 26 50 52 20 24 23.0 36 185 -8 26 50 25 26 51 19 26 29 18 27 12 36 -1.34 - 31 0 0 26 58 0 20 24 26.8 36 186 -9 26 57 32 26 58 27 26 36 24 27 19 46 -1.34 - 30 0 0 27 5 51 20 24 30.7 36 187 -10 27 5 24 27 6 19 26 44 13 27 27 41 -1.34 - 29 0 0 27 14 27 20 24 34.5 35 188 -11 27 14 0 27 14 55 26 52 47 27 36 20 -1.34 - 28 0 0 27 23 48 20 24 38.3 35 189 -12 27 23 20 27 24 15 27 2 4 27 45 43 -1.34 - 27 0 0 27 33 52 20 24 42.1 35 190 -12 27 33 24 27 34 19 27 12 5 27 55 50 -1.34 - 26 0 0 27 44 40 20 24 45.8 35 191 -13 27 44 12 27 45 7 27 22 49 28 6 41 -1.34 - 25 0 0 27 56 11 20 24 49.5 34 192 -14 27 55 44 27 56 39 27 34 17 28 18 17 -1.34 - 24 0 0 28 8 27 20 24 53.2 34 193 -15 28 7 59 28 8 55 27 46 29 28 30 36 -1.34 - 23 0 0 28 21 26 20 24 56.8 33 194 -16 28 20 58 28 21 54 27 59 24 28 43 39 -1.34 - 22 0 0 28 35 8 20 25 0.4 33 196 -17 28 34 40 28 35 36 28 13 2 28 57 26 -1.34 - 21 0 0 28 49 34 20 25 4.0 32 196 -18 28 49 6 28 50 2 28 27 23 29 11 56 -1.34 - 20 0 0 29 4 42 20 25 7.5 32 197 -19 29 4 14 29 5 11 28 42 27 29 27 10 -1.34 - 19 0 0 29 20 34 20 25 11.0 31 198 -19 29 20 6 29 21 2 28 58 13 29 43 7 -1.34 - 18 0 0 29 37 8 20 25 14.4 31 199 -20 29 36 40 29 37 37 29 14 42 29 59 47 -1.34 - 17 0 0 29 54 25 20 25 17.8 30 200 -21 29 53 57 29 54 54 29 31 54 30 17 9 -1.34 - 16 0 0 30 12 24 20 25 21.1 30 201 -22 30 11 55 30 12 53 29 49 47 30 35 14 -1.34 - 15 0 0 30 31 5 20 25 24.4 29 202 -23 30 30 36 30 31 34 30 8 22 30 54 1 -1.34 - 14 0 0 30 50 28 20 25 27.6 28 203 -24 30 49 59 30 50 57 30 27 39 31 13 30 -1.34 - 13 0 0 31 10 32 20 25 30.7 28 204 -24 31 10 3 31 11 1 30 47 36 31 33 41 -1.34 - 12 0 0 31 31 18 20 25 33.8 27 205 -25 31 30 48 31 31 47 31 8 15 31 54 34 -1.34 - 11 0 0 31 52 44 20 25 36.8 26 206 -26 31 52 15 31 53 13 31 29 34 32 16 7 -1.34 - 10 0 0 32 14 51 20 25 39.8 26 206 -27 32 14 21 32 15 20 31 51 34 32 38 21 -1.34 - 9 0 0 32 37 37 20 25 42.6 25 207 -27 32 37 8 32 38 7 32 14 13 33 1 16 -1.34 - 8 0 0 33 1 3 20 25 45.4 24 208 -28 33 0 34 33 1 33 32 37 32 33 24 50 -1.34 - 7 0 0 33 25 9 20 25 48.1 23 209 -29 33 24 39 33 25 39 33 1 29 33 49 3 -1.34 - 6 0 0 33 49 53 20 25 50.8 23 210 -30 33 49 23 33 50 23 33 26 5 34 13 56 -1.34 - 5 0 0 34 15 16 20 25 53.3 22 210 -30 34 14 45 34 15 46 33 51 19 34 39 27 -1.34 - 4 0 0 34 41 16 20 25 55.8 21 211 -31 34 40 45 34 41 46 34 17 10 35 5 36 -1.34 - 3 0 0 35 7 53 20 25 58.2 20 212 -32 35 7 22 35 8 24 34 43 39 35 32 22 -1.35 - 2 0 0 35 35 6 20 26 0.4 20 213 -32 35 34 35 35 35 37 35 10 43 35 59 46 -1.35 - 1 0 0 36 2 56 20 26 2.6 19 213 -33 36 2 25 36 3 27 35 38 23 36 27 45 -1.35 0 0 0 36 31 21 20 26 4.8 18 214 -33 36 30 49 36 31 52 36 6 38 36 56 19 -1.35 1 0 0 37 0 20 20 26 6.8 17 215 -34 36 59 48 37 0 51 36 35 28 37 25 29 -1.35 2 0 0 37 29 52 20 26 8.7 16 216 -34 37 29 21 37 30 24 37 4 50 37 55 12 -1.35 3 0 0 37 59 58 20 26 10.5 15 216 -35 37 59 26 38 0 30 37 34 46 38 25 28 -1.35 4 0 0 38 30 36 20 26 12.2 14 217 -35 38 30 3 38 31 8 38 5 13 38 56 17 -1.35 5 0 0 39 1 45 20 26 13.8 13 218 -36 39 1 12 39 2 17 38 36 11 39 27 36 -1.35 6 0 0 39 33 24 20 26 15.3 13 218 -36 39 32 51 39 33 56 39 7 39 39 59 27 -1.35 7 0 0 40 5 32 20 26 16.7 12 219 -37 40 4 59 40 6 5 39 39 36 40 31 47 -1.36 8 0 0 40 38 8 20 26 18.0 11 220 -37 40 37 35 40 38 41 40 12 1 41 4 35 -1.36 9 0 0 41 11 12 20 26 19.2 10 221 -37 41 10 38 41 11 45 40 44 53 41 37 50 -1.36 10 0 0 41 44 41 20 26 20.3 9 221 -38 41 44 8 41 45 15 41 18 12 42 11 32 -1.36 11 0 0 42 18 36 20 26 21.3 8 222 -38 42 18 2 42 19 10 41 51 54 42 45 39 -1.37 12 0 0 42 52 54 20 26 22.2 7 223 -38 42 52 20 42 53 28 42 26 1 43 20 10 -1.37 13 0 0 43 27 35 20 26 22.9 6 223 -38 43 27 1 43 28 10 43 0 29 43 55 3 -1.38 14 0 0 44 2 37 20 26 23.6 5 224 -39 44 2 2 44 3 12 43 35 19 44 30 18 -1.39 15 0 0 44 37 58 20 26 24.1 4 225 -39 44 37 23 44 38 33 44 10 28 45 5 52 -1.40 16 0 0 45 13 38 20 26 24.6 3 225 -39 45 13 3 45 14 14 44 45 56 45 41 45 -1.42 17 0 0 45 49 35 20 26 24.9 2 226 -39 45 49 0 45 50 11 45 21 40 46 17 55 -1.45 18 0 0 46 25 48 20 26 25.1 2 227 -39 46 25 12 46 26 23 45 57 40 46 54 20 -1.52 19 0 0 47 2 14 20 26 25.2 1 228 -39 47 1 38 47 2 50 46 33 54 47 31 0 -1.79 20 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 47 10 20 .. .. .. .... Uncertainty in time = +/- 10 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 316-214147 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 45 22.3529 DE: -26 56 58.065 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 45 22.3529 DE: -26 56 58.065 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 13.2 * B mag [mag]: 14.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20236) 1998 BZ7 asteroid class: approx. diameter [km]: 1 approx. diameter ["]: 0.001 distance from Earth [AU]: 1.24200 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 date of fit: 2022 Oct 05 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): 0.277", 0.021", 90.318° remarks: * orbital elements for (20236)1998 BZ7 : Mean anomaly = 37.9091654935 deg Arg. of pericenter = 104.5759750880 deg Long. of node = 111.2335664542 deg Inclination = 6.5064462631 deg Eccentricity = 0.5609676487 Semimajor axis = 2.0336730881 AU Perihelion dist = 0.8928482778 AU Mag: H = 17.71, G = 0.15 Epoch of elements : MJD 60585.84998133 TDT (2024 Oct 02.8500) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432022Oct05,0.04,2024,10,2,20.399555,-0.031129,0.799489,14.629709,0.564428,0.004558,0.000372,0.000000,0.000000 -36.3078,-26.9250,-128.72,-4.01,False UCAC4 316-214147,18.75620918,-26.9494624,14.35,13.17,12.53,0.1,0,,18.78189087,-26.9249862,7.58,7.76,0,0,0 20236,1998 BZ7,20.75,0.998,1.2420,0,0,7.743,4.01,,0.1,0 0,37.6203,2024,10,2,104.5760,111.2336,6.5064,0.56097,2.03367,0.89285,17.71,5.0,0.15 24.243,0.2767,0.0213,90,0.0246,Known errors,1.00,0,-1,-1 20241002_214147,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org