IOTA/IOTA-ES occultation update for (721) Tabora / TYC 6918-00550-1 event on 2024 Oct 01, 05:31 UT Visible from Summary ------- On 2024 Oct 01 UT, the 79.248 km diameter asteroid (721) Tabora will occult a 11.9 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 3.39 mag to 15.23 mag (the magnitude of the asteroid) for at most 13.200 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: 95 * date and approx. time of event: 2024 Oct 01, 05:13 - 2024 Oct 01, 05:49 * geocentric midpoint of event [JD]: 2460584.73011308 * magnitude of target star: 11.89 * magnitude drop [mag]: 3.39 * estimated maximum duration [s]: 13.200 * Moon: 2 % sunlit, 128° distance * Sun: 112° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 6.0020 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6918-00550-1 by 721 Tabora on 2024 Oct 1 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 90 0 0 -47 18 36 5 13 40.4 0 136 45 -47 49 21 .. .. .. -48 16 41 .. .. .. .... 91 0 0 -47 59 56 5 13 40.6 1 135 45 -48 30 17 -47 29 35 -48 57 16 -47 2 36 0.14 92 0 0 -48 39 42 5 13 41.1 2 134 44 -49 9 39 -48 9 44 -49 36 18 -47 43 6 0.08 93 0 0 -49 17 57 5 13 41.9 3 134 44 -49 47 31 -48 48 22 -50 13 50 -48 22 4 0.06 94 0 0 -49 54 44 5 13 42.9 4 133 43 -50 23 57 -49 25 32 -50 49 55 -48 59 33 0.05 95 0 0 -50 30 7 5 13 44.1 5 132 43 -50 58 58 -50 1 16 -51 24 38 -49 35 37 0.04 96 0 0 -51 4 8 5 13 45.6 6 131 42 -51 32 38 -50 35 38 -51 57 59 -50 10 17 0.04 97 0 0 -51 36 50 5 13 47.2 6 131 42 -52 5 0 -51 8 41 -52 30 3 -50 43 38 0.03 98 0 0 -52 8 17 5 13 49.0 7 130 41 -52 36 7 -51 40 26 -53 0 52 -51 15 41 0.03 99 0 0 -52 38 29 5 13 51.0 8 129 41 -53 6 0 -52 10 58 -53 30 28 -51 46 30 0.02 100 0 0 -53 7 31 5 13 53.1 9 128 40 -53 34 43 -52 40 19 -53 58 55 -52 16 7 0.02 101 0 0 -53 35 25 5 13 55.4 10 127 40 -54 2 19 -53 8 30 -54 26 14 -52 44 34 0.02 102 0 0 -54 2 12 5 13 57.8 10 127 39 -54 28 49 -53 35 35 -54 52 29 -53 11 55 0.02 103 0 0 -54 27 56 5 14 0.4 11 126 39 -54 54 16 -54 1 36 -55 17 41 -53 38 10 0.02 104 0 0 -54 52 38 5 14 3.0 12 125 38 -55 18 42 -54 26 34 -55 41 52 -54 3 23 0.01 105 0 0 -55 16 20 5 14 5.8 12 124 38 -55 42 8 -54 50 32 -56 5 5 -54 27 35 0.01 106 0 0 -55 39 6 5 14 8.6 13 123 37 -56 4 38 -55 13 33 -56 27 22 -54 50 49 0.01 107 0 0 -56 0 55 5 14 11.5 14 122 37 -56 26 13 -55 35 37 -56 48 43 -55 13 6 0.01 108 0 0 -56 21 51 5 14 14.6 14 122 37 -56 46 55 -55 56 47 -57 9 13 -55 34 29 0.01 109 0 0 -56 41 55 5 14 17.7 15 121 36 -57 6 45 -56 17 4 -57 28 51 -55 54 58 0.01 110 0 0 -57 1 8 5 14 20.9 16 120 36 -57 25 46 -56 36 31 -57 47 39 -56 14 36 0.01 111 0 0 -57 19 33 5 14 24.1 16 119 35 -57 43 58 -56 55 8 -58 5 40 -56 33 25 0.01 112 0 0 -57 37 10 5 14 27.5 17 118 35 -58 1 23 -57 12 57 -58 22 55 -56 51 25 0.00 113 0 0 -57 54 2 5 14 30.9 18 117 34 -58 18 3 -57 30 0 -58 39 24 -57 8 38 0.00 114 0 0 -58 10 9 5 14 34.3 18 116 34 -58 33 59 -57 46 18 -58 55 10 -57 25 6 0.00 115 0 0 -58 25 32 5 14 37.8 19 116 34 -58 49 12 -58 1 53 -59 10 14 -57 40 50 0.00 116 0 0 -58 40 14 5 14 41.4 19 115 33 -59 3 43 -58 16 45 -59 24 36 -57 55 51 0.00 117 0 0 -58 54 15 5 14 45.0 20 114 33 -59 17 34 -58 30 55 -59 38 18 -58 10 11 0.00 118 0 0 -59 7 36 5 14 48.7 21 113 32 -59 30 46 -58 44 26 -59 51 22 -58 23 49 0.00 119 0 0 -59 20 18 5 14 52.4 21 112 32 -59 43 19 -58 57 17 -60 3 47 -58 36 48 0.00 120 0 0 -59 32 23 5 14 56.2 22 111 32 -59 55 15 -59 9 30 -60 15 36 -58 49 9 0.00 121 0 0 -59 43 50 5 15 0.0 22 110 31 -60 6 35 -59 21 6 -60 26 48 -59 0 52 0.00 122 0 0 -59 54 42 5 15 3.9 23 110 31 -60 17 19 -59 32 5 -60 37 25 -59 11 58 -0.01 123 0 0 -60 4 59 5 15 7.8 23 109 30 -60 27 28 -59 42 29 -60 47 28 -59 22 29 -0.01 124 0 0 -60 14 41 5 15 11.8 24 108 30 -60 37 3 -59 52 18 -60 56 57 -59 32 24 -0.01 125 0 0 -60 23 49 5 15 15.8 24 107 30 -60 46 5 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12 5 48 42.8 11 215 -48 39 43 57 40 58 25 39 10 48 41 31 29 0.04 -110 0 0 41 25 6 5 48 47.0 10 216 -48 40 48 31 42 1 40 40 15 56 42 34 10 0.04 -109 0 0 42 26 21 5 48 50.6 8 217 -47 41 50 23 43 2 18 41 18 23 43 34 14 0.04 -108 0 0 43 25 4 5 48 53.6 7 217 -47 42 49 42 44 0 24 42 18 15 44 31 48 0.05 -107 0 0 44 21 20 5 48 56.0 6 218 -46 43 46 34 44 56 5 43 15 38 45 26 58 0.05 -106 0 0 45 15 17 5 48 57.9 5 219 -46 44 41 5 45 49 28 44 10 39 46 19 51 0.05 -105 0 0 46 7 0 5 48 59.4 4 220 -45 45 33 21 46 40 38 45 3 25 47 10 32 0.06 -104 0 0 46 56 36 5 49 0.4 3 220 -45 46 23 29 47 29 42 45 54 1 47 59 8 0.08 -103 0 0 47 44 10 5 49 1.0 1 221 -44 47 11 33 48 16 45 46 42 33 48 45 44 0.12 -102 0 0 48 29 46 5 49 1.3 0 222 -44 47 57 40 49 1 53 47 29 5 .. .. .. 0.32 -101 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 48 13 45 .. .. .. .... Uncertainty in time = +/- 8 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6918-00550-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 22 03.7233 DE: -29 24 39.727 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 22 03.7231 DE: -29 24 39.727 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (721) Tabora asteroid class: approx. diameter [km]: 79 approx. diameter ["]: 0.038 distance from Earth [AU]: 2.88390 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): 0.023", 0.002", 78.7° remarks: * orbital elements for (721)Tabora : Mean anomaly = 298.0583681114 deg Arg. of pericenter = 353.0741865150 deg Long. of node = 38.3634319671 deg Inclination = 8.3233972932 deg Eccentricity = 0.1181314944 Semimajor axis = 3.5489397982 AU Perihelion dist = 3.1296982364 AU Mag: H = 9.41, G = 0.15 Epoch of elements : MJD 60584.23011250 TDT (2024 Oct 01.2301) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,13.20,2024,10,1,5.522714,-0.017456,0.011344,1.781163,2.881688,0.005181,0.001656,0.000001,0.000000 -147.3886,-29.3333,94.56,-3.39,False TYC 6918-00550-1,20.36770093,-29.4110351,12.23,11.89,11.71,0.0,0,,20.39322401,-29.3333214,3.38,3.13,0,0,0 721,Tabora,15.23,79.248,2.8839,0,0,0.416,8.79,,4.0,0 0,298.0244,2024,10,1,353.0742,38.3634,8.3234,0.11813,3.54894,3.12970,9.41,5.0,0.15 1.445,0.0230,0.0018,79,0.0169,Known errors,0.83,0,-1,-1 20241001_0550-1,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org