IOTA/IOTA-ES occultation update for (746) Marlu / TYC 7857-00880-1 event on 2024 Sep 06, 16:45 UT Visible from Summary ------- On 2024 Sep 06 UT, the 71.8502184007158 km diameter asteroid (746) Marlu will occult a 8.5 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.25 mag to 14.72 mag (the magnitude of the asteroid) for at most 3.420 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 Sep 06, 16:42 - 2024 Sep 06, 16:49 * geocentric midpoint of event [JD]: 2460560.19857662 * magnitude of target star: 8.47 * magnitude drop [mag]: 6.25 * estimated maximum duration [s]: 3.420 * Moon: 11 % sunlit, 50° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 104 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.003", 107°) * approx speed of asteroid's shadow [km/s]: 21.1775 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7857-00880-1 by 746 Marlu on 2024 Sep 6 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 - 55 0 0 .. .. .... .. .. .. .. .. .. 25 51 11 .. .. .. 25 27 12 .. .. .. .... - 54 0 0 25 34 49 16 42 27.7 1 137 65 24 54 53 26 15 27 24 31 16 26 40 9 .... - 53 0 0 24 39 11 16 42 28.0 2 137 65 23 59 51 25 19 10 23 36 35 25 43 27 -0.64 - 52 0 0 23 44 51 16 42 28.6 4 138 65 23 6 6 24 24 13 22 43 11 24 48 7 -0.77 - 51 0 0 22 51 50 16 42 29.3 5 138 64 22 13 39 23 30 36 21 51 3 23 54 9 -0.83 - 50 0 0 22 0 7 16 42 30.2 6 139 64 21 22 29 22 38 20 21 0 12 23 1 31 -0.87 - 49 0 0 21 9 44 16 42 31.3 8 139 64 20 32 37 21 47 24 20 10 37 22 10 15 -0.90 - 48 0 0 20 20 39 16 42 32.7 9 139 63 19 44 2 20 57 48 19 22 19 21 20 20 -0.91 - 47 0 0 19 32 53 16 42 34.2 10 140 63 18 56 44 20 9 32 18 35 18 20 31 46 -0.93 - 46 0 0 18 46 25 16 42 35.9 11 140 62 18 10 44 19 22 36 17 49 34 19 44 32 -0.94 - 45 0 0 18 1 15 16 42 37.7 12 141 62 17 26 0 18 36 59 17 5 5 18 58 38 -0.95 - 44 0 0 17 17 23 16 42 39.8 14 141 61 16 42 33 17 52 41 16 21 53 18 14 4 -0.96 - 43 0 0 16 34 49 16 42 42.0 15 141 61 16 0 23 17 9 41 15 39 56 17 30 48 -0.96 - 42 0 0 15 53 31 16 42 44.3 16 142 60 15 19 28 16 28 0 14 59 15 16 48 52 -0.97 - 41 0 0 15 13 30 16 42 46.8 17 142 59 14 39 49 15 47 35 14 19 49 16 8 14 -0.97 - 40 0 0 14 34 44 16 42 49.5 18 142 58 14 1 24 15 8 28 13 41 37 15 28 53 -0.98 - 39 0 0 13 57 15 16 42 52.3 19 143 57 13 24 15 14 30 38 13 4 39 14 50 49 -0.98 - 38 0 0 13 21 0 16 42 55.2 20 143 57 12 48 20 13 54 3 12 28 55 14 14 2 -0.98 - 37 0 0 12 46 0 16 42 58.3 21 144 56 12 13 38 13 18 43 11 54 24 13 38 31 -0.99 - 36 0 0 12 12 13 16 43 1.4 22 144 55 11 40 9 12 44 39 11 21 6 13 4 15 -0.99 - 35 0 0 11 39 40 16 43 4.7 23 144 54 11 7 53 12 11 48 10 48 59 12 31 14 -0.99 - 34 0 0 11 8 20 16 43 8.2 24 145 53 10 36 49 11 40 11 10 18 5 11 59 27 -0.99 - 33 0 0 10 38 12 16 43 11.7 25 145 52 10 6 56 11 9 47 9 48 21 11 28 53 -1.00 - 32 0 0 10 9 15 16 43 15.3 26 146 51 9 38 14 10 40 36 9 19 48 10 59 32 -1.00 - 31 0 0 9 41 30 16 43 19.1 27 146 50 9 10 43 10 12 36 8 52 24 10 31 24 -1.00 - 30 0 0 9 14 55 16 43 22.9 28 147 49 8 44 21 9 45 48 8 26 11 10 4 27 -1.00 - 29 0 0 8 49 31 16 43 26.9 29 147 48 8 19 9 9 20 10 8 1 6 9 38 41 -1.00 - 28 0 0 8 25 15 16 43 30.9 30 148 47 7 55 6 8 55 43 7 37 10 9 14 6 -1.01 - 27 0 0 8 2 9 16 43 35.0 31 148 46 7 32 11 8 32 25 7 14 21 8 50 41 -1.01 - 26 0 0 7 40 11 16 43 39.2 32 149 45 7 10 24 8 10 16 6 52 41 8 28 26 -1.01 - 25 0 0 7 19 22 16 43 43.5 32 149 44 6 49 44 7 49 16 6 32 7 8 7 19 -1.01 - 24 0 0 6 59 39 16 43 47.8 33 150 43 6 30 11 7 29 24 6 12 39 7 47 21 -1.01 - 23 0 0 6 41 4 16 43 52.2 34 151 42 6 11 45 7 10 40 5 54 18 7 28 31 -1.01 - 22 0 0 6 23 36 16 43 56.7 35 151 41 5 54 25 6 53 2 5 37 3 7 10 49 -1.01 - 21 0 0 6 7 13 16 44 1.3 35 152 40 5 38 10 6 36 32 5 20 53 6 54 14 -1.02 - 20 0 0 5 51 57 16 44 5.9 36 152 39 5 23 1 6 21 8 5 5 48 6 38 45 -1.02 - 19 0 0 5 37 45 16 44 10.6 37 153 38 5 8 56 6 6 50 4 51 47 6 24 23 -1.02 - 18 0 0 5 24 39 16 44 15.3 37 154 37 4 55 56 5 53 38 4 38 51 6 11 7 -1.02 - 17 0 0 5 12 38 16 44 20.1 38 155 36 4 44 1 5 41 31 4 26 58 5 58 57 -1.02 - 16 0 0 5 1 41 16 44 24.9 39 155 35 4 33 9 5 30 29 4 16 10 5 47 51 -1.02 - 15 0 0 4 51 49 16 44 29.8 39 156 34 4 23 21 5 20 32 4 6 24 5 37 51 -1.02 - 14 0 0 4 43 0 16 44 34.8 40 157 33 4 14 36 5 11 39 3 57 42 5 28 56 -1.02 - 13 0 0 4 35 16 16 44 39.7 40 158 32 4 6 55 5 3 51 3 50 3 5 21 6 -1.02 - 12 0 0 4 28 34 16 44 44.8 41 159 31 4 0 17 4 57 6 3 43 27 5 14 19 -1.03 - 11 0 0 4 22 56 16 44 49.8 41 160 30 3 54 42 4 51 26 3 37 53 5 8 37 -1.03 - 10 0 0 4 18 22 16 44 54.9 42 160 29 3 50 9 4 46 49 3 33 22 5 3 59 -1.03 - 9 0 0 4 14 51 16 45 0.1 42 161 28 3 46 39 4 43 16 3 29 53 5 0 25 -1.03 - 8 0 0 4 12 22 16 45 5.3 42 162 27 3 44 12 4 40 47 3 27 26 4 57 55 -1.03 - 7 0 0 4 10 57 16 45 10.5 43 163 26 3 42 48 4 39 21 3 26 2 4 56 29 -1.03 - 6 0 0 4 10 35 16 45 15.7 43 164 24 3 42 26 4 38 59 3 25 40 4 56 7 -1.03 - 5 0 0 4 11 16 16 45 21.0 43 165 23 3 43 6 4 39 40 3 26 20 4 56 49 -1.03 - 4 0 0 4 13 0 16 45 26.3 44 166 22 3 44 49 4 41 25 3 28 3 4 58 34 -1.03 - 3 0 0 4 15 47 16 45 31.6 44 167 21 3 47 35 4 44 14 3 30 48 5 1 24 -1.03 - 2 0 0 4 19 38 16 45 36.9 44 168 20 3 51 24 4 48 6 3 34 35 5 5 17 -1.03 - 1 0 0 4 24 31 16 45 42.3 44 169 19 3 56 15 4 53 2 3 39 25 5 10 15 -1.03 0 0 0 4 30 29 16 45 47.7 44 170 18 4 2 9 4 59 3 3 45 18 5 16 17 -1.03 1 0 0 4 37 30 16 45 53.0 44 171 17 4 9 7 5 6 7 3 52 14 5 23 24 -1.03 2 0 0 4 45 35 16 45 58.4 44 173 16 4 17 8 5 14 16 4 0 13 5 31 35 -1.03 3 0 0 4 54 44 16 46 3.9 44 174 15 4 26 13 5 23 30 4 9 15 5 40 52 -1.03 4 0 0 5 4 58 16 46 9.3 44 175 14 4 36 22 5 33 49 4 19 21 5 51 14 -1.03 5 0 0 5 16 16 16 46 14.7 44 176 13 4 47 35 5 45 13 4 30 30 6 2 41 -1.03 6 0 0 5 28 40 16 46 20.1 44 177 12 4 59 52 5 57 42 4 42 44 6 15 14 -1.03 7 0 0 5 42 9 16 46 25.6 44 178 11 5 13 15 6 11 18 4 56 3 6 28 54 -1.03 8 0 0 5 56 43 16 46 31.0 43 179 10 5 27 42 6 26 0 5 10 26 6 43 40 -1.03 9 0 0 6 12 24 16 46 36.4 43 180 9 5 43 16 6 41 49 5 25 55 6 59 34 -1.03 10 0 0 6 29 12 16 46 41.9 43 181 8 5 59 55 6 58 45 5 42 30 7 16 35 -1.03 11 0 0 6 47 6 16 46 47.3 43 182 7 6 17 41 7 16 48 6 0 11 7 34 44 -1.03 12 0 0 7 6 9 16 46 52.7 42 183 6 6 36 34 7 36 0 6 18 58 7 54 2 -1.03 13 0 0 7 26 19 16 46 58.1 42 184 6 6 56 34 7 56 21 6 38 52 8 14 29 -1.03 14 0 0 7 47 38 16 47 3.5 41 185 5 7 17 42 8 17 51 6 59 55 8 36 5 -1.03 15 0 0 8 10 6 16 47 8.8 41 186 4 7 39 59 8 40 30 7 22 5 8 58 52 -1.03 16 0 0 8 33 44 16 47 14.1 40 187 3 8 3 25 9 4 20 7 45 24 9 22 49 -1.03 17 0 0 8 58 32 16 47 19.4 40 188 2 8 28 1 9 29 21 8 9 52 9 47 58 -1.03 18 0 0 9 24 30 16 47 24.7 39 189 1 8 53 46 9 55 33 8 35 30 10 14 19 -1.03 19 0 0 9 51 41 16 47 29.9 39 190 0 9 20 43 10 22 58 9 2 18 10 41 52 -1.03 20 0 0 10 20 3 16 47 35.1 38 191 -1 9 48 50 10 51 35 9 30 17 11 10 39 -1.03 21 0 0 10 49 38 16 47 40.3 37 192 -2 10 18 10 11 21 26 9 59 27 11 40 39 -1.03 22 0 0 11 20 26 16 47 45.4 37 193 -3 10 48 41 11 52 30 10 29 50 12 11 54 -1.03 23 0 0 11 52 27 16 47 50.4 36 193 -4 11 20 26 12 24 50 11 1 25 12 44 24 -1.03 24 0 0 12 25 44 16 47 55.4 35 194 -5 11 53 25 12 58 24 11 34 14 13 18 10 -1.03 25 0 0 13 0 16 16 48 0.3 34 195 -6 12 27 38 13 33 15 12 8 16 13 53 12 -1.03 26 0 0 13 36 3 16 48 5.2 33 196 -7 13 3 6 14 9 23 12 43 33 14 29 32 -1.03 27 0 0 14 13 7 16 48 10.0 33 197 -8 13 39 50 14 46 47 13 20 4 15 7 10 -1.03 28 0 0 14 51 28 16 48 14.7 32 197 -9 14 17 49 15 25 30 13 57 51 15 46 6 -1.03 29 0 0 15 31 6 16 48 19.3 31 198 -9 14 57 6 16 5 31 14 36 55 16 26 22 -1.03 30 0 0 16 12 2 16 48 23.8 30 199 -10 15 37 39 16 46 52 15 17 15 17 7 57 -1.03 31 0 0 16 54 17 16 48 28.3 29 199 -11 16 19 30 17 29 32 15 58 51 17 50 53 -1.03 32 0 0 17 37 52 16 48 32.6 28 200 -12 17 2 39 18 13 33 16 41 46 18 35 10 -1.03 33 0 0 18 22 45 16 48 36.8 27 201 -13 17 47 6 18 58 54 17 25 58 19 20 48 -1.03 34 0 0 19 8 59 16 48 40.9 26 201 -14 18 32 53 19 45 36 18 11 28 20 7 48 -1.03 35 0 0 19 56 34 16 48 44.9 25 202 -14 19 19 58 20 33 40 18 58 17 20 56 11 -1.03 36 0 0 20 45 28 16 48 48.7 23 203 -15 20 8 23 21 23 7 19 46 25 21 45 56 -1.03 37 0 0 21 35 44 16 48 52.4 22 203 -16 20 58 8 22 13 55 20 35 51 22 37 5 -1.03 38 0 0 22 27 21 16 48 56.0 21 204 -17 21 49 12 23 6 6 21 26 37 23 29 38 -1.03 39 0 0 23 20 19 16 48 59.4 20 204 -17 22 41 36 23 59 40 22 18 41 24 23 33 -1.03 40 0 0 24 14 38 16 49 2.6 19 205 -18 23 35 20 24 54 36 23 12 4 25 18 53 -1.03 41 0 0 25 10 19 16 49 5.7 18 205 -19 24 30 23 25 50 56 24 6 46 26 15 37 -1.04 42 0 0 26 7 20 16 49 8.5 16 206 -19 25 26 45 26 48 38 25 2 46 27 13 44 -1.04 43 0 0 27 5 41 16 49 11.2 15 207 -20 26 24 27 27 47 42 26 0 4 28 13 15 -1.04 44 0 0 28 5 23 16 49 13.7 14 207 -20 27 23 26 28 48 8 26 58 40 29 14 10 -1.04 45 0 0 29 6 24 16 49 16.0 12 208 -21 28 23 43 29 49 56 27 58 32 30 16 27 -1.04 46 0 0 30 8 44 16 49 18.1 11 208 -21 29 25 18 30 53 5 28 59 40 31 20 7 -1.05 47 0 0 31 12 22 16 49 19.9 10 209 -22 30 28 7 31 57 34 30 2 2 32 25 7 -1.05 48 0 0 32 17 16 16 49 21.6 8 209 -22 31 32 12 33 3 21 31 5 38 33 31 28 -1.06 49 0 0 33 23 25 16 49 22.9 7 210 -22 32 37 28 34 10 26 32 10 25 34 39 9 -1.07 50 0 0 34 30 48 16 49 24.1 6 211 -23 33 43 57 35 18 48 33 16 22 35 48 8 -1.09 51 0 0 35 39 24 16 49 25.0 4 211 -23 34 51 35 36 28 25 34 23 28 36 58 25 -1.11 52 0 0 36 49 11 16 49 25.6 3 212 -23 36 0 21 37 39 16 35 31 41 38 9 57 -1.16 53 0 0 38 0 5 16 49 26.0 1 212 -23 37 10 14 38 51 18 36 40 58 39 22 42 -1.31 54 0 0 .. .. .... .. .. .. .. .. .. 38 21 9 .. .. .. 37 51 16 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: TYC 7857-00880-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 25 28.6169 DE: -40 38 55.864 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 25 28.6168 DE: -40 38 55.864 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 8.5 * B mag [mag]: 9.5 * Diameter [mas]: 0.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (746) Marlu asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.043 distance from Earth [AU]: 2.28460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#113 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): 0.028", 0.003", 107.353° remarks: * orbital elements for (746)Marlu : Mean anomaly = 340.1490183173 deg Arg. of pericenter = 306.9912019868 deg Long. of node = 1.9083871748 deg Inclination = 17.4750428949 deg Eccentricity = 0.2357232410 Semimajor axis = 3.1123315412 AU Perihelion dist = 2.3786826633 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 60559.69857625 TDT (2024 Sep 06.6986) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Apr24,3.42,2024,9,6,16.765839,-0.126644,0.706725,11.765821,2.108087,0.005442,-0.001013,0.000000,0.000000 9.0369,-40.7075,-71.95,6.07,False TYC 7857-00880-1,16.42461585,-40.6488512,9.53,8.47,7.90,0.4,0,,16.45275949,-40.7075473,6.26,6.38,0,0,0 746,Marlu,14.72,72.513,2.2846,0,0,3.983,8.12,,4.6,0 0,340.0236,2024,9,6,306.9912,1.9084,17.4750,0.23572,3.11233,2.37868,9.85,5.0,0.15 1.300,0.0277,0.0033,107,0.0131,Known errors,1.37,0,-1,-1 20240906_0880-1,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org