IOTA/IOTA-ES occultation update for (4489) Dracius / TYC 1305-00453-1 event on 2023 Nov 28, 18:26 UT Visible from Australia, S Africa Summary ------- On 2023 Nov 28 UT, the 84.1 km diameter asteroid (4489) Dracius will occult a 9.4 mag star in the constellation Taurus for observers along a path across Australia, S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.48 mag to 15.91 mag (the magnitude of the asteroid) for at most 5.000 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: 93 * date and approx. time of event: 2023 Nov 28, 18:21 - 2023 Nov 28, 18:32 * geocentric midpoint of event [JD]: 2460277.26880388 * magnitude of target star: 9.43 * magnitude drop [mag]: 6.48 * estimated maximum duration [s]: 5.000 * Moon: 97 % sunlit, 8° distance * Sun: 163° distance * rough path description: Australia, S Africa The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.001", 65°) * approx speed of asteroid's shadow [km/s]: 16.8310 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1305-00453-1 by 4489 Dracius on 2023 Nov 28 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 0 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -23 5 33 .. .. .. .... 17 0 0 -23 44 50 18 31 59.4 1 68 -15 -23 13 20 -24 16 36 -22 43 56 -24 46 42 .... 18 0 0 -23 23 27 18 31 59.3 2 68 -16 -22 52 2 -23 55 7 -22 22 42 -24 25 8 0.48 19 0 0 -23 2 27 18 31 59.0 3 67 -17 -22 31 7 -23 34 2 -22 1 53 -24 3 58 0.61 20 0 0 -22 41 52 18 31 58.5 4 67 -18 -22 10 37 -23 13 21 -21 41 27 -23 43 12 0.66 21 0 0 -22 21 41 18 31 57.9 5 67 -19 -21 50 31 -22 53 5 -21 21 26 -23 22 51 0.70 22 0 0 -22 1 55 18 31 57.2 6 66 -20 -21 30 50 -22 33 14 -21 1 50 -23 2 54 0.72 23 0 0 -21 42 34 18 31 56.3 7 66 -21 -21 11 34 -22 13 48 -20 42 38 -22 43 24 0.73 24 0 0 -21 23 39 18 31 55.3 8 65 -21 -20 52 44 -21 54 48 -20 23 53 -22 24 19 0.74 25 0 0 -21 5 10 18 31 54.1 9 65 -22 -20 34 20 -21 36 14 -20 5 33 -22 5 40 0.75 26 0 0 -20 47 7 18 31 52.8 9 65 -23 -20 16 22 -21 18 7 -19 47 40 -21 47 28 0.76 27 0 0 -20 29 31 18 31 51.4 10 64 -24 -19 58 51 -21 0 26 -19 30 13 -21 29 43 0.76 28 0 0 -20 12 22 18 31 49.8 11 64 -25 -19 41 46 -20 43 12 -19 13 12 -21 12 25 0.77 29 0 0 -19 55 40 18 31 48.1 12 64 -26 -19 25 9 -20 26 26 -18 56 39 -20 55 34 0.77 30 0 0 -19 39 26 18 31 46.3 13 63 -27 -19 8 59 -20 10 7 -18 40 33 -20 39 11 0.78 31 0 0 -19 23 39 18 31 44.3 14 63 -28 -18 53 16 -19 54 16 -18 24 54 -20 23 16 0.78 32 0 0 -19 8 21 18 31 42.2 15 62 -29 -18 38 2 -19 38 53 -18 9 44 -20 7 49 0.78 33 0 0 -18 53 30 18 31 40.0 16 62 -30 -18 23 15 -19 23 58 -17 55 1 -19 52 50 0.78 34 0 0 -18 39 8 18 31 37.7 17 62 -31 -18 8 57 -19 9 32 -17 40 46 -19 38 20 0.78 35 0 0 -18 25 14 18 31 35.2 18 61 -31 -17 55 7 -18 55 34 -17 27 0 -19 24 18 0.79 36 0 0 -18 11 49 18 31 32.6 19 61 -32 -17 41 46 -18 42 5 -17 13 42 -19 10 45 0.79 37 0 0 -17 58 52 18 31 29.9 20 60 -33 -17 28 53 -18 29 5 -17 0 52 -18 57 42 0.79 38 0 0 -17 46 25 18 31 27.0 21 60 -34 -17 16 29 -18 16 34 -16 48 31 -18 45 8 0.79 39 0 0 -17 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-44 -15 19 51 -16 18 48 -14 52 24 -16 46 49 0.80 52 0 0 -15 43 42 18 30 35.6 33 53 -44 -15 14 21 -16 13 15 -14 46 56 -16 41 14 0.80 53 0 0 -15 38 40 18 30 31.1 34 53 -45 -15 9 21 -16 8 12 -14 41 57 -16 36 9 0.80 54 0 0 -15 34 9 18 30 26.6 35 52 -46 -15 4 51 -16 3 39 -14 37 28 -16 31 35 0.80 55 0 0 -15 30 7 18 30 22.0 35 51 -46 -15 0 50 -15 59 36 -14 33 29 -16 27 31 0.80 56 0 0 -15 26 36 18 30 17.3 36 51 -47 -14 57 20 -15 56 4 -14 30 0 -16 23 57 0.80 57 0 0 -15 23 35 18 30 12.5 37 50 -47 -14 54 20 -15 53 2 -14 27 1 -16 20 54 0.80 58 0 0 -15 21 4 18 30 7.7 38 49 -48 -14 51 50 -15 50 30 -14 24 31 -16 18 22 0.80 59 0 0 -15 19 3 18 30 2.7 38 49 -48 -14 49 50 -15 48 28 -14 22 32 -16 16 19 0.80 60 0 0 -15 17 32 18 29 57.7 39 48 -49 -14 48 19 -15 46 57 -14 21 2 -16 14 48 0.80 61 0 0 -15 16 31 18 29 52.6 40 47 -49 -14 47 19 -15 45 56 -14 20 2 -16 13 46 0.80 62 0 0 -15 16 1 18 29 47.4 41 46 -50 -14 46 49 -15 45 25 -14 19 32 -16 13 15 0.80 63 0 0 -15 16 0 18 29 42.2 41 46 -50 -14 46 49 -15 45 24 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39 -21 28 8 -19 58 4 -21 57 22 0.81 101 0 0 -21 15 11 18 25 53.4 49 357 -43 -20 44 30 -21 46 7 -20 15 50 -22 15 26 0.81 102 0 0 -21 33 31 18 25 47.3 49 355 -42 -21 2 44 -22 4 31 -20 34 0 -22 33 54 0.81 103 0 0 -21 52 14 18 25 41.2 48 354 -42 -21 21 23 -22 23 19 -20 52 35 -22 52 46 0.81 104 0 0 -22 11 21 18 25 35.2 48 353 -41 -21 40 26 -22 42 31 -21 11 33 -23 12 3 0.81 105 0 0 -22 30 52 18 25 29.1 47 351 -40 -21 59 52 -23 2 7 -21 30 55 -23 31 44 0.81 106 0 0 -22 50 46 18 25 23.2 47 350 -39 -22 19 41 -23 22 6 -21 50 40 -23 51 47 0.81 107 0 0 -23 11 3 18 25 17.2 47 349 -39 -22 39 54 -23 42 28 -22 10 48 -24 12 14 0.81 108 0 0 -23 31 43 18 25 11.4 46 348 -38 -23 0 28 -24 3 12 -22 31 18 -24 33 3 0.81 109 0 0 -23 52 44 18 25 5.5 45 346 -37 -23 21 25 -24 24 19 -22 52 10 -24 54 15 0.81 110 0 0 -24 14 7 18 24 59.7 45 345 -36 -23 42 43 -24 45 47 -23 13 24 -25 15 48 0.81 111 0 0 -24 35 51 18 24 54.0 44 344 -36 -24 4 22 -25 7 36 -23 34 58 -25 37 42 0.81 112 0 0 -24 57 56 18 24 48.4 44 343 -35 -24 26 21 -25 29 46 -23 56 53 -25 59 57 0.81 113 0 0 -25 20 21 18 24 42.8 43 342 -34 -24 48 41 -25 52 16 -24 19 8 -26 22 32 0.81 114 0 0 -25 43 6 18 24 37.2 42 341 -33 -25 11 21 -26 15 6 -24 41 43 -26 45 27 0.81 115 0 0 -26 6 10 18 24 31.8 42 340 -32 -25 34 19 -26 38 15 -25 4 37 -27 8 41 0.81 116 0 0 -26 29 32 18 24 26.4 41 339 -31 -25 57 37 -27 1 43 -25 27 49 -27 32 14 0.82 117 0 0 -26 53 12 18 24 21.1 40 338 -31 -26 21 12 -27 25 29 -25 51 20 -27 56 5 0.82 118 0 0 -27 17 10 18 24 15.8 40 337 -30 -26 45 5 -27 49 32 -26 15 8 -28 20 13 0.82 119 0 0 -27 41 25 18 24 10.7 39 336 -29 -27 9 15 -28 13 52 -26 39 13 -28 44 39 0.82 120 0 0 -28 5 57 18 24 5.6 38 335 -28 -27 33 41 -28 38 29 -27 3 35 -29 9 20 0.82 121 0 0 -28 30 43 18 24 0.6 38 334 -27 -27 58 22 -29 3 21 -27 28 12 -29 34 17 0.82 122 0 0 -28 55 45 18 23 55.8 37 333 -26 -28 23 19 -29 28 28 -27 53 4 -29 59 30 0.82 123 0 0 -29 21 2 18 23 51.0 36 332 -25 -28 48 31 -29 53 50 -28 18 11 -30 24 56 0.82 124 0 0 -29 46 32 18 23 46.2 35 331 -24 -29 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58 -39 28 48 -41 41 35 0.83 149 0 0 -41 1 39 18 22 24.5 14 312 -2 -40 27 34 -41 36 3 -39 55 49 -42 8 42 0.83 150 0 0 -41 28 36 18 22 22.7 13 312 -1 -40 54 30 -42 3 1 -40 22 43 -42 35 41 0.83 151 0 0 -41 55 25 18 22 21.1 12 311 0 -41 21 18 -42 29 51 -40 49 30 -43 2 32 0.83 152 0 0 -42 22 6 18 22 19.6 12 310 1 -41 47 58 -42 56 33 -41 16 10 -43 29 15 0.83 153 0 0 -42 48 38 18 22 18.2 11 310 2 -42 14 30 -43 23 5 -41 42 41 -43 55 48 0.83 154 0 0 -43 15 0 18 22 16.9 10 309 3 -42 40 52 -43 49 28 -42 9 2 -44 22 11 0.83 155 0 0 -43 41 12 18 22 15.8 9 308 3 -43 7 4 -44 15 40 -42 35 14 -44 48 23 0.83 156 0 0 -44 7 13 18 22 14.7 8 308 4 -43 33 5 -44 41 41 -43 1 15 -45 14 24 0.84 157 0 0 -44 33 2 18 22 13.8 7 307 5 -43 58 54 -45 7 30 -43 27 5 -45 40 12 0.84 158 0 0 -44 58 39 18 22 12.9 7 306 6 -44 24 31 -45 33 6 -43 52 43 -46 5 47 0.84 159 0 0 -45 24 3 18 22 12.2 6 305 7 -44 49 56 -45 58 29 -44 18 8 -46 31 9 0.84 160 0 0 -45 49 13 18 22 11.6 5 305 8 -45 15 7 -46 23 38 -44 43 21 -46 56 17 0.85 161 0 0 -46 14 9 18 22 11.1 4 304 8 -45 40 5 -46 48 32 -45 8 19 -47 21 11 0.85 162 0 0 -46 38 50 18 22 10.6 3 303 9 -46 4 48 -47 13 12 -45 33 3 -47 45 49 0.86 163 0 0 -47 3 16 18 22 10.3 2 303 10 -46 29 15 -47 37 36 -45 57 33 -48 10 11 0.87 164 0 0 -47 27 27 18 22 10.1 2 302 11 -46 53 28 -48 1 45 -46 21 47 -48 34 18 0.89 165 0 0 -47 51 21 18 22 9.9 1 301 11 -47 17 24 -48 25 37 -46 45 46 -48 58 8 0.95 166 0 0 -48 14 58 18 22 9.9 0 300 12 -47 41 4 .. .. .. -47 9 28 .. .. .. 1.81 Uncertainty in time = +/- 4 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: TYC 1305-00453-1 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 28 54.2086 DE: +19 38 52.943 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 28 54.2088 DE: +19 38 52.943 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4489) Dracius asteroid class: approx. diameter [km]: 84 approx. diameter ["]: 0.029 distance from Earth [AU]: 3.93080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#64 date of fit: 2023 Oct 10 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): 0.022", 0.001", 65.011° remarks: * orbital elements for (4489)Dracius : Mean anomaly = 344.0482261553 deg Arg. of pericenter = 10.3770224358 deg Long. of node = 86.4199005249 deg Inclination = 22.2565391402 deg Eccentricity = 0.0612772212 Semimajor axis = 5.1862259384 AU Perihelion dist = 4.8684284242 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 60276.76861111 TDT (2023 Nov 28.7686) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#642023Oct10,5.00,2023,11,28,18.451293,-0.145637,-0.609312,-9.242371,2.196936,-0.001785,0.000272,0.000001,0.000000 98.4170,19.6681,-99.78,-21.35,False TYC 1305-00453-1,5.48172462,19.6480399,0.00,9.43,0.00,0.0,0,,5.50552352,19.6680965,6.48,0.00,0,0,0 4489,Dracius,15.91,84.100,3.9308,0,0,-1.463,4.91,,5.8,0 0,343.9841,2023,11,28,10.3770,86.4199,22.2565,0.06128,5.18623,4.86843,9.16,5.0,0.15 1.470,0.0223,0.0007,65,0.0223,Known errors,-1.00,0,-1,-1 20231128_0453-1,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org