IOTA/IOTA-ES occultation update for (924) Toni / UCAC4 388-107386 event on 2024 Jul 02, 22:08 UT Visible from Summary ------- On 2024 Jul 02 UT, the 81.4729768867613 km diameter asteroid (924) Toni will occult a 11.3 mag star in the constellation Scutum for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.27 mag to 13.46 mag (the magnitude of the asteroid) for at most 6.870 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: 100 * date and approx. time of event: 2024 Jul 02, 21:59 - 2024 Jul 02, 22:17 * geocentric midpoint of event [JD]: 2460494.42241120 * magnitude of target star: 11.33 * magnitude drop [mag]: 2.27 * estimated maximum duration [s]: 6.870 * Moon: 11 % sunlit, 140° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 11.9298 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 388-107386 by 924 Toni on 2024 Jul 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 - 69 0 0 -23 24 17 22 17 0.3 1 103 -4 -23 1 3 -23 47 34 -22 57 13 -23 51 24 .... - 68 0 0 -23 37 22 22 17 0.1 2 103 -5 -23 14 8 -24 0 37 -23 10 19 -24 4 27 0.19 - 67 0 0 -23 50 12 22 16 59.8 3 102 -6 -23 26 59 -24 13 26 -23 23 10 -24 17 15 0.19 - 66 0 0 -24 2 47 22 16 59.3 4 102 -7 -23 39 36 -24 26 0 -23 35 47 -24 29 49 0.19 - 65 0 0 -24 15 7 22 16 58.7 5 102 -8 -23 51 57 -24 38 19 -23 48 9 -24 42 8 0.19 - 64 0 0 -24 27 13 22 16 57.9 5 101 -9 -24 4 4 -24 50 23 -24 0 16 -24 54 12 0.19 - 63 0 0 -24 39 3 22 16 57.0 6 101 -9 -24 15 55 -25 2 12 -24 12 7 -25 6 1 0.19 - 62 0 0 -24 50 38 22 16 55.9 7 100 -10 -24 27 32 -25 13 46 -24 23 44 -25 17 35 0.19 - 61 0 0 -25 1 58 22 16 54.8 8 100 -11 -24 38 53 -25 25 5 -24 35 5 -25 28 53 0.19 - 60 0 0 -25 13 2 22 16 53.4 9 100 -12 -24 49 58 -25 36 8 -24 46 11 -25 39 56 0.19 - 59 0 0 -25 23 51 22 16 52.0 10 99 -13 -25 0 48 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22 0 57.2 32 260 -33 - 7 5 58 - 7 53 20 - 7 2 5 - 7 57 14 0.20 89 0 0 - 7 11 23 22 0 52.0 31 260 -32 - 6 47 44 - 7 35 4 - 6 43 50 - 7 38 58 0.20 90 0 0 - 6 53 12 22 0 47.1 30 260 -31 - 6 29 33 - 7 16 52 - 6 25 40 - 7 20 47 0.20 91 0 0 - 6 35 5 22 0 42.2 29 259 -30 - 6 11 27 - 6 58 45 - 6 7 34 - 7 2 39 0.20 92 0 0 - 6 17 3 22 0 37.6 28 259 -29 - 5 53 26 - 6 40 43 - 5 49 33 - 6 44 37 0.20 93 0 0 - 5 59 7 22 0 33.0 27 259 -28 - 5 35 30 - 6 22 45 - 5 31 37 - 6 26 39 0.20 94 0 0 - 5 41 16 22 0 28.6 26 259 -27 - 5 17 39 - 6 4 54 - 5 13 46 - 6 8 47 0.20 95 0 0 - 5 23 30 22 0 24.4 25 259 -26 - 4 59 55 - 5 47 8 - 4 56 2 - 5 51 1 0.20 96 0 0 - 5 5 52 22 0 20.3 24 259 -25 - 4 42 17 - 5 29 28 - 4 38 24 - 5 33 22 0.20 97 0 0 - 4 48 19 22 0 16.4 23 258 -24 - 4 24 45 - 5 11 55 - 4 20 53 - 5 15 49 0.20 98 0 0 - 4 30 54 22 0 12.7 22 258 -23 - 4 7 21 - 4 54 29 - 4 3 29 - 4 58 22 0.20 99 0 0 - 4 13 37 22 0 9.0 21 258 -22 - 3 50 4 - 4 37 11 - 3 46 12 - 4 41 4 0.20 100 0 0 - 3 56 27 22 0 5.6 20 258 -21 - 3 32 55 - 4 20 0 - 3 29 3 - 4 23 53 0.20 101 0 0 - 3 39 25 22 0 2.3 19 258 -20 - 3 15 55 - 4 2 58 - 3 12 3 - 4 6 50 0.20 102 0 0 - 3 22 32 21 59 59.2 18 258 -19 - 2 59 2 - 3 46 3 - 2 55 10 - 3 49 56 0.20 103 0 0 - 3 5 48 21 59 56.2 17 258 -18 - 2 42 19 - 3 29 18 - 2 38 27 - 3 33 11 0.20 104 0 0 - 2 49 12 21 59 53.4 16 258 -17 - 2 25 45 - 3 12 42 - 2 21 53 - 3 16 34 0.20 105 0 0 - 2 32 47 21 59 50.8 15 258 -16 - 2 9 20 - 2 56 15 - 2 5 29 - 3 0 8 0.20 106 0 0 - 2 16 31 21 59 48.4 14 258 -15 - 1 53 5 - 2 39 59 - 1 49 14 - 2 43 51 0.20 107 0 0 - 2 0 26 21 59 46.1 13 258 -14 - 1 37 1 - 2 23 52 - 1 33 10 - 2 27 44 0.20 108 0 0 - 1 44 31 21 59 44.0 12 258 -13 - 1 21 7 - 2 7 56 - 1 17 16 - 2 11 48 0.21 109 0 0 - 1 28 47 21 59 42.0 11 258 -12 - 1 5 24 - 1 52 11 - 1 1 33 - 1 56 3 0.21 110 0 0 - 1 13 14 21 59 40.2 10 258 -11 - 0 49 52 - 1 36 37 - 0 46 1 - 1 40 28 0.21 111 0 0 - 0 57 52 21 59 38.6 9 258 -10 - 0 34 32 - 1 21 15 - 0 30 41 - 1 25 6 0.21 112 0 0 - 0 42 43 21 59 37.2 8 258 -9 - 0 19 23 - 1 6 4 - 0 15 33 - 1 9 55 0.21 113 0 0 - 0 27 45 21 59 35.9 7 258 -8 - 0 4 27 - 0 51 6 - 0 0 37 - 0 54 56 0.22 114 0 0 - 0 13 0 21 59 34.9 6 257 -7 0 10 17 - 0 36 19 0 14 7 - 0 40 10 0.22 115 0 0 0 1 32 21 59 33.9 5 257 -6 0 24 48 - 0 21 46 0 28 38 - 0 25 36 0.23 116 0 0 0 15 51 21 59 33.2 4 257 -5 0 39 6 - 0 7 26 0 42 56 - 0 11 16 0.24 117 0 0 0 29 57 21 59 32.6 3 257 -4 0 53 11 0 6 41 0 57 1 0 2 51 0.26 118 0 0 0 43 50 21 59 32.2 2 258 -3 1 7 3 0 20 35 1 10 52 0 16 45 0.29 119 0 0 0 57 28 21 59 32.0 1 258 -2 1 20 40 0 34 15 1 24 29 0 30 25 0.43 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 388-107386 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 43 47.6875 DE: -12 29 17.014 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 43 47.6875 DE: -12 29 17.014 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.3 * B mag [mag]: 13.2 * Diameter [mas]: 0.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (924) Toni asteroid class: approx. diameter [km]: 81 approx. diameter ["]: 0.060 distance from Earth [AU]: 1.86490 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.021", 0.002", 90.419° remarks: * orbital elements for (924)Toni : Mean anomaly = 287.4941380687 deg Arg. of pericenter = 220.4555721092 deg Long. of node = 150.1662625883 deg Inclination = 8.9861832903 deg Eccentricity = 0.1532247533 Semimajor axis = 2.9395702911 AU Perihelion dist = 2.4891553585 AU Mag: H = 9.47, G = 0.15 Epoch of elements : MJD 60493.92241133 TDT (2024 Jul 02.9224) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,6.87,2024,7,2,22.137869,0.041970,-0.190767,-6.576213,-1.446818,0.000088,-0.001022,0.000001,0.000000 27.7947,-12.4636,-151.00,22.94,False UCAC4 388-107386,18.72991318,-12.4880594,13.19,11.33,10.33,0.4,0,,18.75315004,-12.4636419,2.28,2.77,0,0,0 924,Toni,13.46,82.014,1.8649,0,0,-2.117,-6.82,,5.0,0 0,287.3138,2024,7,2,220.4556,150.1663,8.9862,0.15322,2.93957,2.48916,9.47,5.0,0.15 1.082,0.0213,0.0016,90,0.0050,Known errors,0.81,0,-1,-1 20240702_107386,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org