IOTA/IOTA-ES occultation update for (12445) Sirataka / TYC 7391-00231-1 event on 2024 Sep 20, 18:30 UT Visible from Summary ------- On 2024 Sep 20 UT, the 12.0286766697121 km diameter asteroid (12445) Sirataka will occult a 8.5 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 9.83 mag to 18.32 mag (the magnitude of the asteroid) for at most 0.820 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: 77 * date and approx. time of event: 2024 Sep 20, 18:23 - 2024 Sep 20, 18:37 * geocentric midpoint of event [JD]: 2460574.27092638 * magnitude of target star: 8.49 * magnitude drop [mag]: 9.83 * estimated maximum duration [s]: 0.820 * Moon: 89 % sunlit, 125° distance * Sun: 93° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.72 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 100°) * approx speed of asteroid's shadow [km/s]: 14.9946 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7391-00231-1 by 12445 Sirataka on 2024 Sep 20 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 - 87 0 0 10 47 36 18 23 17.9 1 121 75 10 43 36 10 51 35 10 37 52 10 57 20 .... - 86 0 0 10 12 16 18 23 18.1 2 121 75 10 8 17 10 16 15 10 2 33 10 22 0 -0.09 - 85 0 0 9 37 3 18 23 18.5 3 121 75 9 33 4 9 41 2 9 27 20 9 46 46 -0.15 - 84 0 0 9 1 57 18 23 19.0 4 122 74 8 57 58 9 5 55 8 52 15 9 11 39 -0.18 - 83 0 0 8 26 59 18 23 19.8 5 122 74 8 23 1 8 30 57 8 17 18 8 36 41 -0.20 - 82 0 0 7 52 11 18 23 20.7 7 122 73 7 48 13 7 56 9 7 42 31 8 1 52 -0.21 - 81 0 0 7 17 33 18 23 21.8 8 122 72 7 13 36 7 21 31 7 7 54 7 27 13 -0.22 - 80 0 0 6 43 8 18 23 23.0 9 122 71 6 39 11 6 47 5 6 33 29 6 52 46 -0.22 - 79 0 0 6 8 54 18 23 24.5 10 122 71 6 4 58 6 12 51 5 59 17 6 18 32 -0.23 - 78 0 0 5 34 55 18 23 26.1 11 122 70 5 30 59 5 38 51 5 25 19 5 44 31 -0.23 - 77 0 0 5 1 10 18 23 27.9 12 122 69 4 57 14 5 5 6 4 51 35 5 10 45 -0.23 - 76 0 0 4 27 41 18 23 29.9 13 123 68 4 23 46 4 31 36 4 18 7 4 37 15 -0.24 - 75 0 0 3 54 28 18 23 32.0 15 123 67 3 50 34 3 58 23 3 44 56 4 4 1 -0.24 - 74 0 0 3 21 34 18 23 34.3 16 123 66 3 17 40 3 25 28 3 12 3 3 31 5 -0.24 - 73 0 0 2 48 58 18 23 36.8 17 123 65 2 45 4 2 52 51 2 39 28 2 58 28 -0.24 - 72 0 0 2 16 41 18 23 39.4 18 123 64 2 12 48 2 20 34 2 7 12 2 26 10 -0.24 - 71 0 0 1 44 45 18 23 42.2 19 123 63 1 40 52 1 48 37 1 35 18 1 54 12 -0.24 - 70 0 0 1 13 10 18 23 45.2 20 123 62 1 9 18 1 17 2 1 3 44 1 22 36 -0.25 - 69 0 0 0 41 56 18 23 48.3 21 123 61 0 38 5 0 45 48 0 32 32 0 51 21 -0.25 - 68 0 0 0 11 6 18 23 51.5 23 123 60 0 7 15 0 14 57 0 1 43 0 20 29 -0.25 - 67 0 0 - 0 19 21 18 23 55.0 24 123 59 - 0 23 11 - 0 15 31 - 0 28 42 - 0 9 59 -0.25 - 66 0 0 - 0 49 24 18 23 58.5 25 123 58 - 0 53 13 - 0 45 34 - 0 58 44 - 0 40 3 -0.25 - 65 0 0 - 1 19 1 18 24 2.3 26 123 57 - 1 22 50 - 1 15 12 - 1 28 20 - 1 9 42 -0.25 - 64 0 0 - 1 48 13 18 24 6.1 27 123 56 - 1 52 2 - 1 44 25 - 1 57 30 - 1 38 56 -0.25 - 63 0 0 - 2 16 59 18 24 10.1 28 123 55 - 2 20 47 - 2 13 12 - 2 26 15 - 2 7 43 -0.25 - 62 0 0 - 2 45 18 18 24 14.2 29 123 54 - 2 49 5 - 2 41 31 - 2 54 32 - 2 36 4 -0.25 - 61 0 0 - 3 13 10 18 24 18.5 30 123 53 - 3 16 57 - 3 9 24 - 3 22 23 - 3 3 57 -0.25 - 60 0 0 - 3 40 34 18 24 22.9 31 124 52 - 3 44 20 - 3 36 48 - 3 49 45 - 3 31 23 -0.26 - 59 0 0 - 4 7 29 18 24 27.4 33 124 51 - 4 11 14 - 4 3 44 - 4 16 39 - 3 58 20 -0.26 - 58 0 0 - 4 33 56 18 24 32.1 34 124 50 - 4 37 40 - 4 30 11 - 4 43 3 - 4 24 47 -0.26 - 57 0 0 - 4 59 53 18 24 36.9 35 124 49 - 5 3 37 - 4 56 9 - 5 8 59 - 4 50 46 -0.26 - 56 0 0 - 5 25 20 18 24 41.8 36 124 48 - 5 29 3 - 5 21 36 - 5 34 24 - 5 16 15 -0.26 - 55 0 0 - 5 50 17 18 24 46.8 37 124 47 - 5 53 59 - 5 46 34 - 5 59 20 - 5 41 13 -0.26 - 54 0 0 - 6 14 43 18 24 51.9 38 124 46 - 6 18 25 - 6 11 1 - 6 23 45 - 6 5 41 -0.26 - 53 0 0 - 6 38 39 18 24 57.1 39 124 45 - 6 42 20 - 6 34 57 - 6 47 39 - 6 29 38 -0.26 - 52 0 0 - 7 2 3 18 25 2.4 40 124 44 - 7 5 44 - 6 58 22 - 7 11 1 - 6 53 4 -0.26 - 51 0 0 - 7 24 56 18 25 7.8 41 124 42 - 7 28 36 - 7 21 15 - 7 33 53 - 7 15 58 -0.26 - 50 0 0 - 7 47 16 18 25 13.4 42 124 41 - 7 50 56 - 7 43 37 - 7 56 12 - 7 38 20 -0.26 - 49 0 0 - 8 9 5 18 25 19.0 43 124 40 - 8 12 44 - 8 5 26 - 8 17 59 - 8 0 11 -0.26 - 48 0 0 - 8 30 22 18 25 24.7 44 124 39 - 8 34 0 - 8 26 43 - 8 39 14 - 8 21 28 -0.26 - 47 0 0 - 8 51 5 18 25 30.5 45 125 38 - 8 54 43 - 8 47 28 - 8 59 57 - 8 42 14 -0.26 - 46 0 0 - 9 11 17 18 25 36.4 46 125 37 - 9 14 54 - 9 7 39 - 9 20 6 - 9 2 26 -0.26 - 45 0 0 - 9 30 55 18 25 42.3 47 125 36 - 9 34 31 - 9 27 18 - 9 39 43 - 9 22 6 -0.26 - 44 0 0 - 9 50 0 18 25 48.4 48 125 35 - 9 53 36 - 9 46 24 - 9 58 47 - 9 41 12 -0.26 - 43 0 0 -10 8 32 18 25 54.5 49 125 34 -10 12 8 -10 4 56 -10 17 18 - 9 59 46 -0.27 - 42 0 0 -10 26 31 18 26 0.7 50 125 33 -10 30 6 -10 22 56 -10 35 15 -10 17 46 -0.27 - 41 0 0 -10 43 56 18 26 6.9 51 126 32 -10 47 30 -10 40 21 -10 52 39 -10 35 12 -0.27 - 40 0 0 -11 0 47 18 26 13.3 52 126 31 -11 4 21 -10 57 13 -11 9 29 -10 52 5 -0.27 - 39 0 0 -11 17 5 18 26 19.7 53 126 30 -11 20 39 -11 13 32 -11 25 46 -11 8 24 -0.27 - 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9 56 53 -10 9 16 - 9 51 42 -0.27 23 0 0 - 9 41 39 18 33 42.1 55 229 -33 - 9 45 16 - 9 38 3 - 9 50 28 - 9 32 51 -0.27 24 0 0 - 9 22 16 18 33 48.8 54 230 -34 - 9 25 53 - 9 18 39 - 9 31 6 - 9 13 27 -0.27 25 0 0 - 9 2 20 18 33 55.4 53 230 -35 - 9 5 58 - 8 58 42 - 9 11 11 - 8 53 29 -0.27 26 0 0 - 8 41 51 18 34 2.0 52 230 -36 - 8 45 29 - 8 38 12 - 8 50 43 - 8 32 58 -0.27 27 0 0 - 8 20 48 18 34 8.5 51 231 -37 - 8 24 27 - 8 17 9 - 8 29 42 - 8 11 54 -0.27 28 0 0 - 7 59 13 18 34 14.9 50 231 -38 - 8 2 52 - 7 55 33 - 8 8 8 - 7 50 17 -0.27 29 0 0 - 7 37 5 18 34 21.3 49 231 -39 - 7 40 45 - 7 33 25 - 7 46 2 - 7 28 8 -0.27 30 0 0 - 7 14 25 18 34 27.6 48 232 -40 - 7 18 6 - 7 10 45 - 7 23 23 - 7 5 27 -0.27 31 0 0 - 6 51 13 18 34 33.8 47 232 -41 - 6 54 54 - 6 47 32 - 7 0 13 - 6 42 13 -0.27 32 0 0 - 6 27 29 18 34 39.9 46 232 -42 - 6 31 11 - 6 23 47 - 6 36 31 - 6 18 28 -0.27 33 0 0 - 6 3 14 18 34 45.9 45 232 -43 - 6 6 57 - 5 59 32 - 6 12 17 - 5 54 11 -0.27 34 0 0 - 5 38 28 18 34 51.9 44 232 -44 - 5 42 11 - 5 34 45 - 5 47 32 - 5 29 23 -0.27 35 0 0 - 5 13 11 18 34 57.7 43 233 -45 - 5 16 54 - 5 9 27 - 5 22 17 - 5 4 4 -0.27 36 0 0 - 4 47 23 18 35 3.5 42 233 -46 - 4 51 8 - 4 43 39 - 4 56 31 - 4 38 15 -0.27 37 0 0 - 4 21 6 18 35 9.1 41 233 -47 - 4 24 51 - 4 17 21 - 4 30 15 - 4 11 56 -0.27 38 0 0 - 3 54 19 18 35 14.7 40 233 -48 - 3 58 5 - 3 50 33 - 4 3 30 - 3 45 8 -0.26 39 0 0 - 3 27 3 18 35 20.1 39 233 -49 - 3 30 49 - 3 23 17 - 3 36 15 - 3 17 50 -0.26 40 0 0 - 2 59 18 18 35 25.4 38 233 -51 - 3 3 5 - 2 55 31 - 3 8 32 - 2 50 4 -0.26 41 0 0 - 2 31 6 18 35 30.6 37 233 -52 - 2 34 53 - 2 27 18 - 2 40 21 - 2 21 50 -0.26 42 0 0 - 2 2 26 18 35 35.7 35 234 -53 - 2 6 14 - 1 58 38 - 2 11 43 - 1 53 9 -0.26 43 0 0 - 1 33 19 18 35 40.7 34 234 -54 - 1 37 8 - 1 29 30 - 1 42 37 - 1 24 0 -0.26 44 0 0 - 1 3 46 18 35 45.5 33 234 -55 - 1 7 35 - 0 59 56 - 1 13 6 - 0 54 26 -0.26 45 0 0 - 0 33 47 18 35 50.3 32 234 -56 - 0 37 37 - 0 29 57 - 0 43 9 - 0 24 25 -0.26 46 0 0 - 0 3 24 18 35 54.8 31 234 -57 - 0 7 14 0 0 27 - 0 12 47 0 6 0 -0.26 47 0 0 0 27 24 18 35 59.3 30 234 -58 0 23 33 0 31 15 0 18 0 0 36 49 -0.26 48 0 0 0 58 35 18 36 3.6 29 234 -59 0 54 43 1 2 27 0 49 9 1 8 1 -0.26 49 0 0 1 30 9 18 36 7.7 28 234 -60 1 26 17 1 34 2 1 20 42 1 39 37 -0.26 50 0 0 2 2 5 18 36 11.7 26 235 -61 1 58 12 2 5 58 1 52 36 2 11 34 -0.26 51 0 0 2 34 21 18 36 15.6 25 235 -62 2 30 28 2 38 15 2 24 51 2 43 52 -0.26 52 0 0 3 6 58 18 36 19.3 24 235 -63 3 3 4 3 10 53 2 57 27 3 16 30 -0.26 53 0 0 3 39 54 18 36 22.8 23 235 -63 3 36 0 3 43 49 3 30 22 3 49 27 -0.26 54 0 0 4 13 9 18 36 26.2 22 235 -64 4 9 14 4 17 4 4 3 35 4 22 43 -0.26 55 0 0 4 46 40 18 36 29.5 21 235 -65 4 42 45 4 50 36 4 37 5 4 56 16 -0.26 56 0 0 5 20 29 18 36 32.5 20 235 -66 5 16 32 5 24 25 5 10 52 5 30 5 -0.26 57 0 0 5 54 32 18 36 35.4 18 235 -67 5 50 35 5 58 29 5 44 55 6 4 10 -0.26 58 0 0 6 28 50 18 36 38.1 17 236 -68 6 24 53 6 32 47 6 19 12 6 38 29 -0.26 59 0 0 7 3 21 18 36 40.7 16 236 -68 6 59 24 7 7 19 6 53 42 7 13 1 -0.26 60 0 0 7 38 5 18 36 43.1 15 236 -69 7 34 7 7 42 3 7 28 24 7 47 46 -0.26 61 0 0 8 12 59 18 36 45.3 14 236 -70 8 9 1 8 16 58 8 3 18 8 22 41 -0.26 62 0 0 8 48 4 18 36 47.3 13 236 -71 8 44 5 8 52 3 8 38 22 8 57 47 -0.26 63 0 0 9 23 18 18 36 49.2 12 236 -71 9 19 19 9 27 17 9 13 34 9 33 1 -0.26 64 0 0 9 58 39 18 36 50.9 10 237 -72 9 54 40 10 2 38 9 48 55 10 8 23 -0.26 65 0 0 10 34 7 18 36 52.4 9 237 -72 10 30 7 10 38 7 10 24 22 10 43 52 -0.26 66 0 0 11 9 41 18 36 53.7 8 237 -72 11 5 41 11 13 41 10 59 55 11 19 26 -0.25 67 0 0 11 45 19 18 36 54.9 7 237 -73 11 41 19 11 49 19 11 35 33 11 55 5 -0.25 68 0 0 12 21 0 18 36 55.8 6 237 -73 12 17 0 12 25 0 12 11 14 12 30 47 -0.25 69 0 0 12 56 43 18 36 56.6 5 238 -73 12 52 43 13 0 44 12 46 56 13 6 30 -0.25 70 0 0 13 32 27 18 36 57.2 4 238 -73 13 28 27 13 36 28 13 22 40 13 42 15 -0.25 71 0 0 14 8 11 18 36 57.7 2 238 -73 14 4 11 14 12 12 13 58 24 14 17 59 -0.25 72 0 0 14 43 54 18 36 58.0 1 238 -73 14 39 53 14 47 55 14 34 6 14 53 42 -0.23 73 0 0 15 19 34 18 36 58.1 0 239 -73 15 15 33 15 23 35 15 9 46 15 29 22 0.02 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7391-00231-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 00.7124 DE: -30 13 38.141 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 05 00.7123 DE: -30 13 38.141 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 8.5 * B mag [mag]: 8.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12445) Sirataka asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.81720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2023 Apr 25 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): 0.019", 0.001", 100.192° remarks: * orbital elements for (12445)Sirataka : Mean anomaly = 36.3374315823 deg Arg. of pericenter = 180.3421555348 deg Long. of node = 72.2361759268 deg Inclination = 10.1000257392 deg Eccentricity = 0.0282980469 Semimajor axis = 3.1119665780 AU Perihelion dist = 3.0239040019 AU Mag: H = 12.68, G = 0.15 Epoch of elements : MJD 60573.77092604 TDT (2024 Sep 20.7709) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.82,2024,9,20,18.502233,-0.011079,0.264375,8.455820,0.357468,0.005720,0.000104,0.000000,0.000000 -6.0212,-30.2271,-99.24,0.68,False TYC 7391-00231-1,18.08353125,-30.2272615,8.52,8.49,8.47,0.1,0,,18.10996196,-30.2271296,9.83,9.40,0,0,0 12445,Sirataka,18.32,12.233,2.8172,0,0,2.037,1.12,,1.0,0 0,36.1990,2024,9,20,180.3422,72.2362,10.1000,0.02830,3.11197,3.02390,12.68,5.0,0.15 1.720,0.0190,0.0011,100,0.0043,Known errors,0.82,0,-1,-1 20240920_0231-1,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org