IOTA/IOTA-ES occultation update for (746) Marlu / TYC 7883-02070-1 event on 2024 Oct 06, 22:10 UT Visible from Summary ------- On 2024 Oct 06 UT, the 71.957 km diameter asteroid (746) Marlu will occult a 11.1 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 3.84 mag to 14.91 mag (the magnitude of the asteroid) for at most 2.320 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 06, 22:07 - 2024 Oct 06, 22:13 * geocentric midpoint of event [JD]: 2460590.42395667 * magnitude of target star: 11.10 * magnitude drop [mag]: 3.84 * estimated maximum duration [s]: 2.320 * Moon: 14 % sunlit, 26° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 72 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.003", 97°) * approx speed of asteroid's shadow [km/s]: 31.0809 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7883-02070-1 by 746 Marlu on 2024 Oct 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 178 0 0 - 7 18 55 22 7 4.7 1 129 63 - 7 44 9 - 6 53 41 - 7 53 45 - 6 44 5 .... 179 0 0 - 8 7 48 22 7 4.8 2 129 64 - 8 32 59 - 7 42 37 - 8 42 34 - 7 33 2 0.09 -180 0 0 - 8 56 22 22 7 5.1 3 129 65 - 9 21 30 - 8 31 14 - 9 31 4 - 8 21 40 0.06 -179 0 0 - 9 44 34 22 7 5.4 5 129 66 -10 9 38 - 9 19 29 -10 19 11 - 9 9 56 0.05 -178 0 0 -10 32 22 22 7 5.8 6 129 67 -10 57 23 -10 7 21 -11 6 55 - 9 57 50 0.04 -177 0 0 -11 19 46 22 7 6.3 7 128 67 -11 44 43 -10 54 49 -11 54 13 -10 45 19 0.03 -176 0 0 -12 6 43 22 7 6.9 8 128 68 -12 31 36 -11 41 50 -12 41 4 -11 32 21 0.03 -175 0 0 -12 53 11 22 7 7.7 10 128 69 -13 18 0 -12 28 23 -13 27 27 -12 18 56 0.03 -174 0 0 -13 39 10 22 7 8.5 11 128 69 -14 3 54 -13 14 26 -14 13 19 -13 5 0 0.02 -173 0 0 -14 24 37 22 7 9.3 12 128 70 -14 49 16 -13 59 57 -14 58 39 -13 50 34 0.02 -172 0 0 -15 9 31 22 7 10.3 13 127 71 -15 34 5 -14 44 57 -15 43 27 -14 35 35 0.02 -171 0 0 -15 53 51 22 7 11.4 15 127 71 -16 18 20 -15 29 22 -16 27 40 -15 20 3 0.02 -170 0 0 -16 37 36 22 7 12.5 16 127 72 -17 2 0 -16 13 12 -17 11 17 -16 3 55 0.02 -169 0 0 -17 20 45 22 7 13.7 17 127 72 -17 45 3 -16 56 26 -17 54 18 -16 47 11 0.02 -168 0 0 -18 3 16 22 7 15.0 18 126 72 -18 27 28 -17 39 3 -18 36 41 -17 29 50 0.02 -167 0 0 -18 45 8 22 7 16.4 19 126 72 -19 9 15 -18 21 2 -19 18 26 -18 11 51 0.01 -166 0 0 -19 26 22 22 7 17.8 21 126 72 -19 50 23 -19 2 21 -19 59 31 -18 53 13 0.01 -165 0 0 -20 6 55 22 7 19.4 22 125 72 -20 30 50 -19 43 1 -20 39 56 -19 33 55 0.01 -164 0 0 -20 46 48 22 7 20.9 23 125 72 -21 10 37 -20 23 0 -21 19 41 -20 13 56 0.01 -163 0 0 -21 26 0 22 7 22.6 24 125 72 -21 49 42 -21 2 17 -21 58 43 -20 53 16 0.01 -162 0 0 -22 4 29 22 7 24.3 25 124 72 -22 28 5 -21 40 53 -22 37 4 -21 31 54 0.01 -161 0 0 -22 42 16 22 7 26.0 26 124 72 -23 5 46 -22 18 47 -23 14 42 -22 9 50 0.01 -160 0 0 -23 19 20 22 7 27.8 27 123 72 -23 42 43 -22 55 57 -23 51 37 -22 47 3 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239 -12 -27 30 40 -26 45 19 -27 39 18 -26 36 41 0.00 - 49 0 0 -26 35 38 22 12 28.3 55 239 -13 -26 58 26 -26 12 51 -27 7 6 -26 4 10 0.00 - 48 0 0 -26 2 33 22 12 31.3 54 239 -14 -26 25 27 -25 39 39 -26 34 10 -25 30 56 0.00 - 47 0 0 -25 28 43 22 12 34.4 53 238 -15 -25 51 43 -25 5 42 -26 0 29 -24 56 56 0.00 - 46 0 0 -24 54 8 22 12 37.5 51 238 -16 -25 17 15 -24 31 1 -25 26 4 -24 22 12 0.01 - 45 0 0 -24 18 49 22 12 40.5 50 237 -17 -24 42 3 -23 55 35 -24 50 54 -23 46 44 0.01 - 44 0 0 -23 42 46 22 12 43.5 49 237 -18 -24 6 6 -23 19 25 -24 15 0 -23 10 32 0.01 - 43 0 0 -23 5 58 22 12 46.5 48 236 -19 -23 29 26 -22 42 31 -23 38 22 -22 33 35 0.01 - 42 0 0 -22 28 27 22 12 49.5 47 236 -20 -22 52 1 -22 4 53 -23 1 0 -21 55 55 0.01 - 41 0 0 -21 50 13 22 12 52.5 46 236 -21 -22 13 54 -21 26 33 -22 22 55 -21 17 32 0.01 - 40 0 0 -21 11 16 22 12 55.4 45 235 -22 -21 35 3 -20 47 29 -21 44 6 -20 38 26 0.01 - 39 0 0 -20 31 36 22 12 58.3 44 235 -23 -20 55 30 -20 7 43 -21 4 35 -19 58 37 0.01 - 38 0 0 -19 51 15 22 13 1.1 42 235 -24 -20 15 14 -19 27 15 -20 24 23 -19 18 7 0.01 - 37 0 0 -19 10 12 22 13 3.9 41 234 -25 -19 34 18 -18 46 6 -19 43 28 -18 36 56 0.01 - 36 0 0 -18 28 29 22 13 6.7 40 234 -26 -18 52 41 -18 4 17 -19 1 54 -17 55 4 0.01 - 35 0 0 -17 46 6 22 13 9.4 39 234 -28 -18 10 24 -17 21 48 -18 19 39 -17 12 33 0.01 - 34 0 0 -17 3 5 22 13 12.1 38 233 -29 -17 27 28 -16 38 41 -17 36 46 -16 29 24 0.01 - 33 0 0 -16 19 25 22 13 14.7 37 233 -30 -16 43 55 -15 54 56 -16 53 14 -15 45 37 0.01 - 32 0 0 -15 35 10 22 13 17.3 35 233 -31 -15 59 44 -15 10 35 -16 9 6 -15 1 13 0.01 - 31 0 0 -14 50 18 22 13 19.8 34 233 -32 -15 14 58 -14 25 38 -15 24 22 -14 16 15 0.01 - 30 0 0 -14 4 53 22 13 22.2 33 232 -33 -14 29 38 -13 40 8 -14 39 3 -13 30 42 0.01 - 29 0 0 -13 18 54 22 13 24.6 32 232 -34 -13 43 44 -12 54 4 -13 53 11 -12 44 37 0.01 - 28 0 0 -12 32 24 22 13 26.9 30 232 -36 -12 57 19 -12 7 30 -13 6 48 -11 58 1 0.01 - 27 0 0 -11 45 25 22 13 29.1 29 232 -37 -12 10 23 -11 20 26 -12 19 54 -11 10 55 0.01 - 26 0 0 -10 57 57 22 13 31.3 28 231 -38 -11 23 0 -10 32 54 -11 32 32 -10 23 22 0.01 - 25 0 0 -10 10 2 22 13 33.4 27 231 -39 -10 35 9 - 9 44 55 -10 44 42 - 9 35 22 0.01 - 24 0 0 - 9 21 43 22 13 35.4 25 231 -40 - 9 46 53 - 8 56 33 - 9 56 28 - 8 46 58 0.01 - 23 0 0 - 8 33 0 22 13 37.3 24 231 -41 - 8 58 14 - 8 7 47 - 9 7 50 - 7 58 11 0.01 - 22 0 0 - 7 43 57 22 13 39.1 23 231 -43 - 8 9 13 - 7 18 40 - 8 18 51 - 7 9 3 0.02 - 21 0 0 - 6 54 34 22 13 40.9 21 231 -44 - 7 19 53 - 6 29 15 - 7 29 32 - 6 19 37 0.02 - 20 0 0 - 6 4 55 22 13 42.5 20 230 -45 - 6 30 16 - 5 39 33 - 6 39 55 - 5 29 54 0.02 - 19 0 0 - 5 15 0 22 13 44.1 19 230 -46 - 5 40 24 - 4 49 37 - 5 50 4 - 4 39 57 0.02 - 18 0 0 - 4 24 53 22 13 45.5 18 230 -47 - 4 50 18 - 3 59 28 - 4 59 59 - 3 49 47 0.02 - 17 0 0 - 3 34 35 22 13 46.9 16 230 -49 - 4 0 1 - 3 9 8 - 4 9 42 - 2 59 27 0.02 - 16 0 0 - 2 44 8 22 13 48.1 15 230 -50 - 3 9 36 - 2 18 41 - 3 19 17 - 2 8 59 0.02 - 15 0 0 - 1 53 35 22 13 49.3 14 230 -51 - 2 19 4 - 1 28 7 - 2 28 46 - 1 18 25 0.02 - 14 0 0 - 1 2 59 22 13 50.4 12 230 -52 - 1 28 27 - 0 37 30 - 1 38 9 - 0 27 48 0.02 - 13 0 0 - 0 12 20 22 13 51.3 11 230 -53 - 0 37 49 0 13 8 - 0 47 31 0 22 50 0.03 - 12 0 0 0 38 17 22 13 52.1 10 230 -54 0 12 49 1 3 46 0 3 7 1 13 27 0.03 - 11 0 0 1 28 52 22 13 52.9 8 230 -55 1 3 25 1 54 20 0 53 43 2 4 1 0.03 - 10 0 0 2 19 22 22 13 53.5 7 230 -56 1 53 56 2 44 49 1 44 14 2 54 30 0.04 - 9 0 0 3 9 45 22 13 54.0 6 230 -58 2 44 19 3 35 10 2 34 39 3 44 51 0.04 - 8 0 0 3 59 58 22 13 54.5 5 230 -59 3 34 34 4 25 22 3 24 54 4 35 2 0.05 - 7 0 0 4 49 59 22 13 54.8 3 230 -60 4 24 38 5 15 21 4 14 58 5 25 0 0.07 - 6 0 0 5 39 47 22 13 55.0 2 230 -61 5 14 28 6 5 7 5 4 49 6 14 45 0.11 - 5 0 0 6 29 19 22 13 55.1 1 231 -62 6 4 2 6 54 36 5 54 25 7 4 13 0.32 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7883-02070-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 20 46.0257 DE: -39 01 54.048 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 20 46.0255 DE: -39 01 54.048 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (746) Marlu asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.038 distance from Earth [AU]: 2.58570 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", 97.035° remarks: * orbital elements for (746)Marlu : Mean anomaly = 345.5733996054 deg Arg. of pericenter = 306.9926715443 deg Long. of node = 1.9075635101 deg Inclination = 17.4750814001 deg Eccentricity = 0.2357006067 Semimajor axis = 3.1122416052 AU Perihelion dist = 2.3786843707 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 60589.92395646 TDT (2024 Oct 06.9240) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Apr24,2.32,2024,10,6,22.174960,-0.000388,0.001489,17.339270,2.665388,0.005169,-0.000924,-0.000001,0.000000 -88.0676,-39.0585,-155.66,-5.58,False TYC 7883-02070-1,17.34611828,-39.0316801,11.39,11.10,10.94,0.0,0,,17.37433715,-39.0584956,3.85,3.56,0,0,0 746,Marlu,14.91,71.957,2.5857,0,0,5.063,9.07,,4.6,0 0,345.4075,2024,10,6,306.9927,1.9076,17.4751,0.23570,3.11224,2.37868,9.85,5.0,0.15 1.190,0.0247,0.0030,97,0.0073,Known errors,0.88,0,-1,-1 20241006_2070-1,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org