IOTA/IOTA-ES occultation update for (746) Marlu / TYC 7870-01438-1 event on 2024 Oct 04, 17:38 UT Visible from Summary ------- On 2024 Oct 04 UT, the 71.942 km diameter asteroid (746) Marlu will occult a 11.7 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 3.24 mag to 14.90 mag (the magnitude of the asteroid) for at most 2.370 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 04, 17:35 - 2024 Oct 04, 17:41 * geocentric midpoint of event [JD]: 2460588.23517617 * magnitude of target star: 11.72 * magnitude drop [mag]: 3.24 * estimated maximum duration [s]: 2.370 * Moon: 3 % sunlit, 50° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.003", 98°) * approx speed of asteroid's shadow [km/s]: 30.4062 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7870-01438-1 by 746 Marlu on 2024 Oct 4 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 - 91 0 0 .. .. .... .. .. .. .. .. .. 20 3 53 .. .. .. 19 51 15 .. .. .. .... - 90 0 0 19 44 30 17 35 48.0 1 133 65 19 12 41 20 16 37 19 0 9 20 29 24 .... - 89 0 0 18 53 44 17 35 48.2 2 133 66 18 22 11 19 25 34 18 9 45 19 38 15 -0.40 - 88 0 0 18 3 42 17 35 48.5 4 133 67 17 32 24 18 35 15 17 20 5 18 47 49 -0.50 - 87 0 0 17 14 26 17 35 48.9 5 134 68 16 43 24 17 45 43 16 31 11 17 58 10 -0.56 - 86 0 0 16 25 56 17 35 49.4 6 134 69 15 55 9 16 56 57 15 43 3 17 9 18 -0.58 - 85 0 0 15 38 14 17 35 50.0 7 134 70 15 7 43 16 9 0 14 55 43 16 21 15 -0.60 - 84 0 0 14 51 22 17 35 50.8 9 134 70 14 21 7 15 21 53 14 9 12 15 34 1 -0.62 - 83 0 0 14 5 21 17 35 51.6 10 135 71 13 35 20 14 35 36 13 23 31 14 47 38 -0.63 - 82 0 0 13 20 11 17 35 52.6 11 135 71 12 50 25 13 50 11 12 38 42 14 2 7 -0.64 - 81 0 0 12 35 54 17 35 53.7 12 135 72 12 6 22 13 5 39 11 54 45 13 17 29 -0.64 - 80 0 0 11 52 30 17 35 54.9 13 135 72 11 23 13 12 22 1 11 11 40 12 33 45 -0.65 - 79 0 0 11 10 0 17 35 56.2 15 136 72 10 40 56 11 39 16 10 29 30 11 50 55 -0.65 - 78 0 0 10 28 24 17 35 57.6 16 136 72 9 59 34 10 57 27 9 48 13 11 9 0 -0.66 - 77 0 0 9 47 44 17 35 59.1 17 136 72 9 19 7 10 16 33 9 7 51 10 28 0 -0.66 - 76 0 0 9 7 59 17 36 0.7 18 136 72 8 39 35 9 36 34 8 28 24 9 47 57 -0.66 - 75 0 0 8 29 10 17 36 2.4 19 137 72 8 0 59 8 57 32 7 49 53 9 8 49 -0.67 - 74 0 0 7 51 17 17 36 4.2 20 137 72 7 23 19 8 19 27 7 12 17 8 30 39 -0.67 - 73 0 0 7 14 20 17 36 6.1 21 137 72 6 46 34 7 42 18 6 35 37 7 53 25 -0.67 - 72 0 0 6 38 21 17 36 8.1 23 137 71 6 10 46 7 6 6 5 59 54 7 17 8 -0.67 - 71 0 0 6 3 18 17 36 10.1 24 138 71 5 35 55 6 30 51 5 25 8 6 41 49 -0.68 - 70 0 0 5 29 12 17 36 12.2 25 138 70 5 2 0 5 56 34 4 51 17 6 7 26 -0.68 - 69 0 0 4 56 2 17 36 14.4 26 138 70 4 29 2 5 23 13 4 18 23 5 34 2 -0.68 - 68 0 0 4 23 50 17 36 16.7 27 139 69 3 57 0 4 50 50 3 46 25 5 1 34 -0.68 - 67 0 0 3 52 35 17 36 19.0 28 139 68 3 25 55 4 19 24 3 15 24 4 30 4 -0.68 - 66 0 0 3 22 16 17 36 21.4 29 139 68 2 55 46 3 48 55 2 45 19 3 59 31 -0.68 - 65 0 0 2 52 54 17 36 23.9 30 139 67 2 26 34 3 19 23 2 16 11 3 29 55 -0.68 - 64 0 0 2 24 28 17 36 26.4 31 140 66 1 58 18 2 50 48 1 47 58 3 1 16 -0.68 - 63 0 0 1 56 59 17 36 29.0 32 140 65 1 30 58 2 23 10 1 20 42 2 33 34 -0.69 - 62 0 0 1 30 26 17 36 31.7 33 140 64 1 4 33 1 56 28 0 54 21 2 6 49 -0.69 - 61 0 0 1 4 49 17 36 34.4 34 141 63 0 39 5 1 30 43 0 28 56 1 41 0 -0.69 - 60 0 0 0 40 8 17 36 37.2 35 141 62 0 14 32 1 5 53 0 4 26 1 16 7 -0.69 - 59 0 0 0 16 23 17 36 40.0 36 142 62 - 0 9 6 0 42 0 - 0 19 8 0 52 11 -0.69 - 58 0 0 - 0 6 27 17 36 42.9 37 142 61 - 0 31 48 0 19 2 - 0 41 48 0 29 10 -0.69 - 57 0 0 - 0 28 22 17 36 45.8 38 142 60 - 0 53 36 - 0 3 0 - 1 3 33 0 7 5 -0.69 - 56 0 0 - 0 49 22 17 36 48.8 39 143 59 - 1 14 29 - 0 24 7 - 1 24 23 - 0 14 5 -0.69 - 55 0 0 - 1 9 28 17 36 51.8 40 143 58 - 1 34 28 - 0 44 19 - 1 44 20 - 0 34 20 -0.69 - 54 0 0 - 1 28 39 17 36 54.8 40 144 57 - 1 53 33 - 1 3 37 - 2 3 22 - 0 53 40 -0.69 - 53 0 0 - 1 46 56 17 36 57.9 41 144 56 - 2 11 44 - 1 22 0 - 2 21 31 - 1 12 5 -0.69 - 52 0 0 - 2 4 19 17 37 1.1 42 145 55 - 2 29 1 - 1 39 29 - 2 38 46 - 1 29 37 -0.70 - 51 0 0 - 2 20 48 17 37 4.2 43 146 54 - 2 45 25 - 1 56 3 - 2 55 8 - 1 46 14 -0.70 - 50 0 0 - 2 36 24 17 37 7.4 44 146 53 - 3 0 56 - 2 11 45 - 3 10 37 - 2 1 57 -0.70 - 49 0 0 - 2 51 7 17 37 10.7 44 147 52 - 3 15 34 - 2 26 32 - 3 25 13 - 2 16 46 -0.70 - 48 0 0 - 3 4 57 17 37 14.0 45 147 51 - 3 29 19 - 2 40 27 - 3 38 56 - 2 30 43 -0.70 - 47 0 0 - 3 17 54 17 37 17.3 46 148 50 - 3 42 12 - 2 53 28 - 3 51 47 - 2 43 46 -0.70 - 46 0 0 - 3 29 58 17 37 20.6 47 149 49 - 3 54 13 - 3 5 36 - 4 3 46 - 2 55 56 -0.70 - 45 0 0 - 3 41 10 17 37 24.0 47 150 48 - 4 5 21 - 3 16 52 - 4 14 53 - 3 7 13 -0.70 - 44 0 0 - 3 51 30 17 37 27.4 48 150 47 - 4 15 38 - 3 27 16 - 4 25 9 - 3 17 38 -0.70 - 43 0 0 - 4 0 58 17 37 30.8 49 151 46 - 4 25 3 - 3 36 47 - 4 34 33 - 3 27 10 -0.70 - 42 0 0 - 4 9 35 17 37 34.2 49 152 45 - 4 33 36 - 3 45 26 - 4 43 5 - 3 35 50 -0.70 - 41 0 0 - 4 17 19 17 37 37.7 50 153 44 - 4 41 18 - 3 53 13 - 4 50 46 - 3 43 38 -0.70 - 40 0 0 - 4 24 12 17 37 41.2 50 154 43 - 4 48 9 - 4 0 8 - 4 57 36 - 3 50 34 -0.70 - 39 0 0 - 4 30 14 17 37 44.7 51 155 42 - 4 54 8 - 4 6 12 - 5 3 34 - 3 56 39 -0.70 - 38 0 0 - 4 35 24 17 37 48.2 51 156 41 - 4 59 17 - 4 11 23 - 5 8 42 - 4 1 51 -0.70 - 37 0 0 - 4 39 42 17 37 51.8 52 157 40 - 5 3 34 - 4 15 43 - 5 12 59 - 4 6 12 -0.70 - 36 0 0 - 4 43 10 17 37 55.4 52 158 39 - 5 7 1 - 4 19 12 - 5 16 25 - 4 9 41 -0.70 - 35 0 0 - 4 45 47 17 37 59.0 53 159 38 - 5 9 36 - 4 21 50 - 5 19 1 - 4 12 19 -0.70 - 34 0 0 - 4 47 32 17 38 2.6 53 160 37 - 5 11 21 - 4 23 35 - 5 20 45 - 4 14 5 -0.70 - 33 0 0 - 4 48 26 17 38 6.2 53 162 36 - 5 12 15 - 4 24 30 - 5 21 39 - 4 15 0 -0.70 - 32 0 0 - 4 48 29 17 38 9.8 54 163 35 - 5 12 19 - 4 24 33 - 5 21 42 - 4 15 3 -0.70 - 31 0 0 - 4 47 42 17 38 13.5 54 164 34 - 5 11 31 - 4 23 45 - 5 20 55 - 4 14 15 -0.70 - 30 0 0 - 4 46 3 17 38 17.2 54 165 33 - 5 9 53 - 4 22 6 - 5 19 17 - 4 12 35 -0.70 - 29 0 0 - 4 43 33 17 38 20.8 54 167 32 - 5 7 24 - 4 19 35 - 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3 40 28 - 2 32 13 -0.71 - 16 0 0 - 2 52 43 17 39 9.4 54 184 18 - 3 17 10 - 2 28 7 - 3 26 49 - 2 18 21 -0.71 - 15 0 0 - 2 38 4 17 39 13.2 53 185 17 - 3 2 36 - 2 13 24 - 3 12 17 - 2 3 36 -0.71 - 14 0 0 - 2 22 32 17 39 16.9 53 187 16 - 2 47 9 - 1 57 46 - 2 56 52 - 1 47 56 -0.71 - 13 0 0 - 2 6 6 17 39 20.6 52 188 15 - 2 30 49 - 1 41 15 - 2 40 34 - 1 31 22 -0.71 - 12 0 0 - 1 48 46 17 39 24.4 52 189 14 - 2 13 35 - 1 23 49 - 2 23 22 - 1 13 54 -0.71 - 11 0 0 - 1 30 31 17 39 28.1 52 190 13 - 1 55 26 - 1 5 28 - 2 5 16 - 0 55 31 -0.71 - 10 0 0 - 1 11 22 17 39 31.8 51 191 12 - 1 36 24 - 0 46 13 - 1 46 16 - 0 36 13 -0.71 - 9 0 0 - 0 51 19 17 39 35.5 51 193 11 - 1 16 27 - 0 26 2 - 1 26 21 - 0 16 0 -0.71 - 8 0 0 - 0 30 20 17 39 39.2 50 194 10 - 0 55 35 - 0 4 56 - 1 5 32 0 5 9 -0.71 - 7 0 0 - 0 8 25 17 39 42.9 49 195 9 - 0 33 48 0 17 5 - 0 43 48 0 27 14 -0.71 - 6 0 0 0 14 24 17 39 46.6 49 196 8 - 0 11 6 0 40 3 - 0 21 9 0 50 14 -0.71 - 5 0 0 0 38 10 17 39 50.2 48 197 7 0 12 32 1 3 57 0 2 26 1 14 11 -0.71 - 4 0 0 1 2 52 17 39 53.9 47 198 6 0 37 6 1 28 47 0 26 56 1 39 5 -0.70 - 3 0 0 1 28 30 17 39 57.5 47 199 5 1 2 36 1 54 34 0 52 23 2 4 55 -0.70 - 2 0 0 1 55 5 17 40 1.0 46 199 4 1 29 2 2 21 18 1 18 45 2 31 43 -0.70 - 1 0 0 2 22 37 17 40 4.6 45 200 3 1 56 24 2 48 59 1 46 4 2 59 28 -0.70 0 0 0 2 51 6 17 40 8.1 44 201 2 2 24 44 3 17 37 2 14 20 3 28 10 -0.70 1 0 0 3 20 32 17 40 11.6 44 202 1 2 54 0 3 47 14 2 43 32 3 57 50 -0.70 2 0 0 3 50 55 17 40 15.1 43 203 0 3 24 13 4 17 47 3 13 42 4 28 28 -0.70 3 0 0 4 22 16 17 40 18.5 42 203 -1 3 55 24 4 49 19 3 44 48 5 0 4 -0.70 4 0 0 4 54 35 17 40 21.9 41 204 -2 4 27 31 5 21 48 4 16 51 5 32 38 -0.70 5 0 0 5 27 51 17 40 25.2 40 205 -3 5 0 36 5 55 16 4 49 52 6 6 10 -0.70 6 0 0 6 2 5 17 40 28.5 39 205 -4 5 34 39 6 29 42 5 23 50 6 40 40 -0.70 7 0 0 6 37 17 17 40 31.8 38 206 -6 6 9 39 7 5 5 5 58 46 7 16 9 -0.70 8 0 0 7 13 26 17 40 35.0 37 207 -7 6 45 36 7 41 27 6 34 38 7 52 35 -0.70 9 0 0 7 50 33 17 40 38.1 36 207 -8 7 22 30 8 18 46 7 11 28 8 30 0 -0.70 10 0 0 8 28 37 17 40 41.2 35 208 -9 8 0 22 8 57 3 7 49 14 9 8 22 -0.70 11 0 0 9 7 38 17 40 44.2 34 208 -10 8 39 10 9 36 18 8 27 57 9 47 42 -0.70 12 0 0 9 47 36 17 40 47.2 33 209 -11 9 18 55 10 16 29 9 7 37 10 27 59 -0.70 13 0 0 10 28 31 17 40 50.1 32 209 -12 9 59 36 10 57 38 9 48 13 11 9 13 -0.70 14 0 0 11 10 21 17 40 52.9 31 210 -13 10 41 13 11 39 43 10 29 44 11 51 24 -0.70 15 0 0 11 53 7 17 40 55.6 30 210 -14 11 23 44 12 22 43 11 12 10 12 34 30 -0.70 16 0 0 12 36 48 17 40 58.3 29 211 -15 12 7 11 13 6 39 11 55 31 13 18 31 -0.70 17 0 0 13 21 23 17 41 0.9 27 211 -16 12 51 31 13 51 29 12 39 46 14 3 28 -0.70 18 0 0 14 6 52 17 41 3.4 26 212 -17 13 36 45 14 37 13 13 24 53 14 49 17 -0.70 19 0 0 14 53 12 17 41 5.8 25 212 -18 14 22 50 15 23 49 14 10 53 15 36 0 -0.70 20 0 0 15 40 25 17 41 8.1 24 213 -19 15 9 47 16 11 17 14 57 44 16 23 34 -0.70 21 0 0 16 28 27 17 41 10.3 23 213 -20 15 57 34 16 59 36 15 45 25 17 12 0 -0.70 22 0 0 17 17 19 17 41 12.4 21 214 -21 16 46 10 17 48 44 16 33 54 18 1 14 -0.70 23 0 0 18 6 58 17 41 14.5 20 214 -22 17 35 34 18 38 39 17 23 12 18 51 16 -0.70 24 0 0 18 57 24 17 41 16.4 19 215 -23 18 25 43 19 29 22 18 13 15 19 42 5 -0.71 25 0 0 19 48 34 17 41 18.2 18 215 -23 19 16 37 20 20 49 19 4 3 20 33 39 -0.71 26 0 0 20 40 28 17 41 19.8 17 215 -24 20 8 14 21 12 59 19 55 33 21 25 56 -0.71 27 0 0 21 33 2 17 41 21.4 15 216 -25 21 0 32 22 5 50 20 47 44 22 18 54 -0.71 28 0 0 22 26 15 17 41 22.9 14 216 -26 21 53 28 22 59 20 21 40 35 23 12 31 -0.71 29 0 0 23 20 5 17 41 24.2 13 217 -27 22 47 2 23 53 27 22 34 2 24 6 45 -0.71 30 0 0 24 14 30 17 41 25.4 11 217 -28 23 41 10 24 48 9 23 28 4 25 1 34 -0.71 31 0 0 25 9 27 17 41 26.5 10 218 -28 24 35 51 25 43 23 24 22 38 25 56 55 -0.71 32 0 0 26 4 54 17 41 27.4 9 218 -29 25 31 1 26 39 7 25 17 41 26 52 45 -0.72 33 0 0 27 0 47 17 41 28.2 8 219 -30 26 26 38 27 35 17 26 13 12 27 49 2 -0.72 34 0 0 27 57 4 17 41 28.9 6 219 -31 27 22 39 28 31 51 27 9 7 28 45 43 -0.73 35 0 0 28 53 43 17 41 29.5 5 219 -31 28 19 2 29 28 46 28 5 24 29 42 45 -0.73 36 0 0 29 50 40 17 41 29.9 4 220 -32 29 15 43 30 25 59 29 1 59 30 40 5 -0.75 37 0 0 30 47 52 17 41 30.2 2 220 -32 30 12 40 31 23 27 29 58 49 31 37 39 -0.77 38 0 0 31 45 16 17 41 30.4 1 221 -33 31 9 48 32 21 7 30 55 52 32 35 25 -0.85 39 0 0 .. .. .... .. .. .. .. .. .. 32 7 6 .. .. .. 31 53 4 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7870-01438-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 16 21.5781 DE: -39 09 36.858 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 16 21.5780 DE: -39 09 36.858 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (746) Marlu asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.039 distance from Earth [AU]: 2.56440 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): 0.025", 0.003", 97.828° remarks: * orbital elements for (746)Marlu : Mean anomaly = 345.1805940737 deg Arg. of pericenter = 306.9925427099 deg Long. of node = 1.9076208982 deg Inclination = 17.4750774416 deg Eccentricity = 0.2357023890 Semimajor axis = 3.1122488601 AU Perihelion dist = 2.3786843687 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 60587.73517588 TDT (2024 Oct 04.7352) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Apr24,2.37,2024,10,4,17.644228,-0.086894,0.569864,16.967521,2.576902,0.005212,-0.000941,-0.000001,0.000000 -19.0510,-39.1897,-87.54,-4.74,False TYC 7870-01438-1,17.27266063,-39.1602385,12.01,11.72,11.56,0.0,0,,17.30088895,-39.1896966,3.24,2.96,0,0,0 746,Marlu,14.90,71.942,2.5644,0,0,5.005,8.84,,4.6,0 0,345.0486,2024,10,4,306.9925,1.9076,17.4751,0.23570,3.11225,2.37868,9.85,5.0,0.15 1.198,0.0250,0.0030,98,0.0077,Known errors,1.07,0,-1,-1 20241004_1438-1,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org