IOTA/IOTA-ES occultation update for (234) Barbara / TYC 6327-01453-1 event on 2023 Sep 26, 15:28 UT Visible from Australia Summary ------- On 2023 Sep 26 UT, the 45.9 km diameter asteroid (234) Barbara will occult a 11.5 mag star in the constellation Capricornus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.97 mag to 11.88 mag (the magnitude of the asteroid) for at most 4.960 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: 2023 Sep 26, 15:17 - 2023 Sep 26, 15:40 * geocentric midpoint of event [JD]: 2460214.14498275 * magnitude of target star: 11.48 * magnitude drop [mag]: 0.97 * estimated maximum duration [s]: 4.960 * Moon: 89 % sunlit, 25° distance * Sun: 117° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 9.2633 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6327-01453-1 by 234 Barbara on 2023 Sep 26 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 - 9 0 0 .. .. .... .. .. .. .. .. .. 26 46 0 .. .. .. 26 43 17 .. .. .. .... - 8 0 0 26 34 6 15 17 19.1 1 116 40 26 20 18 26 47 54 26 17 35 26 50 37 .... - 7 0 0 26 7 51 15 17 19.4 2 116 39 25 54 1 26 21 42 25 51 17 26 24 26 0.05 - 6 0 0 25 41 1 15 17 19.9 3 117 38 25 27 8 25 54 55 25 24 23 25 57 40 0.03 - 5 0 0 25 13 36 15 17 20.6 4 117 38 24 59 39 25 27 33 24 56 54 25 30 18 0.02 - 4 0 0 24 45 35 15 17 21.6 5 117 37 24 31 35 24 59 35 24 28 49 25 2 21 0.01 - 3 0 0 24 16 58 15 17 22.7 6 118 37 24 2 55 24 31 1 24 0 9 24 33 48 0.01 - 2 0 0 23 47 46 15 17 24.1 7 118 36 23 33 40 24 1 52 23 30 53 24 4 39 0.00 - 1 0 0 23 17 59 15 17 25.8 8 119 35 23 3 50 23 32 8 23 1 2 23 34 56 0.00 - 0 0 0 22 47 36 15 17 27.7 9 119 34 22 33 24 23 1 48 22 30 35 23 4 37 0.00 1 0 0 22 16 38 15 17 29.8 10 119 34 22 2 23 22 30 53 21 59 34 22 33 42 0.00 2 0 0 21 45 5 15 17 32.2 11 120 33 21 30 47 21 59 23 21 27 57 22 2 13 0.00 3 0 0 21 12 57 15 17 34.9 12 120 32 20 58 36 21 27 19 20 55 46 21 30 9 -0.01 4 0 0 20 40 15 15 17 37.8 13 121 31 20 25 51 20 54 40 20 23 0 20 57 30 -0.01 5 0 0 20 6 59 15 17 41.0 15 121 31 19 52 31 20 21 26 19 49 40 20 24 18 -0.01 6 0 0 19 33 9 15 17 44.5 16 121 30 19 18 38 19 47 39 19 15 46 19 50 31 -0.01 7 0 0 18 58 45 15 17 48.2 17 122 29 18 44 11 19 13 18 18 41 19 19 16 11 -0.01 8 0 0 18 23 48 15 17 52.2 18 122 28 18 9 12 18 38 25 18 6 19 18 41 18 -0.01 9 0 0 17 48 19 15 17 56.5 19 122 27 17 33 40 18 2 59 17 30 46 18 5 52 -0.01 10 0 0 17 12 18 15 18 1.1 20 123 27 16 57 36 17 27 1 16 54 42 17 29 55 -0.01 11 0 0 16 35 46 15 18 6.0 21 123 26 16 21 1 16 50 31 16 18 6 16 53 26 -0.01 12 0 0 15 58 44 15 18 11.2 23 123 25 15 43 56 16 13 31 15 41 0 16 16 27 -0.01 13 0 0 15 21 11 15 18 16.7 24 123 24 15 6 21 15 36 1 15 3 25 15 38 57 -0.01 14 0 0 14 43 9 15 18 22.5 25 124 23 14 28 17 14 58 2 14 25 20 15 0 59 -0.01 15 0 0 14 4 40 15 18 28.6 26 124 22 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36 -31 39 44 -0.04 126 0 0 -31 50 9 15 38 12.6 34 263 -57 -32 2 38 -31 37 40 -32 5 6 -31 35 12 -0.04 127 0 0 -31 45 7 15 38 18.5 34 263 -57 -31 57 36 -31 32 37 -32 0 4 -31 30 9 -0.04 128 0 0 -31 39 32 15 38 24.3 33 262 -57 -31 52 2 -31 27 1 -31 54 30 -31 24 33 -0.04 129 0 0 -31 33 25 15 38 29.9 32 262 -57 -31 45 56 -31 20 54 -31 48 25 -31 18 25 -0.04 130 0 0 -31 26 46 15 38 35.4 31 261 -57 -31 39 19 -31 14 14 -31 41 47 -31 11 45 -0.04 131 0 0 -31 19 36 15 38 40.8 30 261 -57 -31 32 9 -31 7 2 -31 34 38 -31 4 33 -0.04 132 0 0 -31 11 52 15 38 46.1 29 260 -57 -31 24 27 -30 59 18 -31 26 56 -30 56 49 -0.04 133 0 0 -31 3 37 15 38 51.2 28 260 -56 -31 16 13 -30 51 2 -31 18 42 -30 48 32 -0.03 134 0 0 -30 54 50 15 38 56.2 27 259 -56 -31 7 27 -30 42 13 -31 9 56 -30 39 43 -0.03 135 0 0 -30 45 30 15 39 1.1 27 259 -56 -30 58 8 -30 32 51 -31 0 38 -30 30 22 -0.03 136 0 0 -30 35 37 15 39 5.8 26 258 -56 -30 48 17 -30 22 58 -30 50 47 -30 20 27 -0.03 137 0 0 -30 25 13 15 39 10.4 25 258 -56 -30 37 54 -30 12 31 -30 40 24 -30 10 1 -0.03 138 0 0 -30 14 15 15 39 14.9 24 257 -55 -30 26 58 -30 1 32 -30 29 28 -29 59 1 -0.03 139 0 0 -30 2 45 15 39 19.2 23 257 -55 -30 15 29 -29 50 0 -30 18 0 -29 47 29 -0.03 140 0 0 -29 50 42 15 39 23.4 22 256 -55 -30 3 28 -29 37 56 -30 5 59 -29 35 24 -0.03 141 0 0 -29 38 6 15 39 27.4 21 256 -55 -29 50 54 -29 25 18 -29 53 26 -29 22 46 -0.03 142 0 0 -29 24 57 15 39 31.3 20 255 -54 -29 37 47 -29 12 8 -29 40 19 -29 9 35 -0.03 143 0 0 -29 11 15 15 39 35.0 19 255 -54 -29 24 7 -28 58 24 -29 26 39 -28 55 51 -0.03 144 0 0 -28 57 0 15 39 38.6 18 254 -54 -29 9 54 -28 44 7 -29 12 27 -28 41 34 -0.03 145 0 0 -28 42 12 15 39 42.0 17 254 -53 -28 55 8 -28 29 17 -28 57 41 -28 26 43 -0.03 146 0 0 -28 26 51 15 39 45.3 17 253 -53 -28 39 48 -28 13 53 -28 42 22 -28 11 20 -0.03 147 0 0 -28 10 56 15 39 48.4 16 253 -53 -28 23 55 -27 57 56 -28 26 29 -27 55 22 -0.02 148 0 0 -27 54 28 15 39 51.4 15 252 -52 -28 7 29 -27 41 26 -28 10 4 -27 38 51 -0.02 149 0 0 -27 37 26 15 39 54.2 14 252 -52 -27 50 30 -27 24 22 -27 53 5 -27 21 47 -0.02 150 0 0 -27 19 50 15 39 56.8 13 251 -51 -27 32 56 -27 6 44 -27 35 32 -27 4 9 -0.02 151 0 0 -27 1 41 15 39 59.2 12 251 -51 -27 14 50 -26 48 33 -27 17 25 -26 45 57 -0.02 152 0 0 -26 42 58 15 40 1.5 11 250 -50 -26 56 9 -26 29 47 -26 58 45 -26 27 11 -0.02 153 0 0 -26 23 42 15 40 3.6 10 250 -50 -26 36 55 -26 10 29 -26 39 32 -26 7 52 -0.02 154 0 0 -26 3 52 15 40 5.5 9 249 -49 -26 17 7 -25 50 36 -26 19 44 -25 47 59 -0.02 155 0 0 -25 43 28 15 40 7.2 8 249 -49 -25 56 46 -25 30 9 -25 59 23 -25 27 32 -0.01 156 0 0 -25 22 30 15 40 8.8 7 249 -48 -25 35 50 -25 9 9 -25 38 29 -25 6 31 -0.01 157 0 0 -25 0 58 15 40 10.1 6 248 -48 -25 14 21 -24 47 35 -25 17 0 -24 44 56 -0.01 158 0 0 -24 38 53 15 40 11.3 5 248 -47 -24 52 19 -24 25 27 -24 54 58 -24 22 48 0.00 159 0 0 -24 16 14 15 40 12.3 4 247 -47 -24 29 42 -24 2 46 -24 32 22 -24 0 6 0.00 160 0 0 -23 53 1 15 40 13.0 3 247 -46 -24 6 32 -23 39 30 -24 9 13 -23 36 50 0.01 161 0 0 -23 29 15 15 40 13.6 2 246 -45 -23 42 49 -23 15 42 -23 45 30 -23 13 1 0.03 162 0 0 -23 4 56 15 40 13.9 1 246 -45 -23 18 32 -22 51 19 -23 21 13 -22 48 38 0.08 163 0 0 -22 40 3 15 40 14.1 0 246 -44 -22 53 42 .. .. .. -22 56 23 .. .. .. 1.33 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 6327-01453-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 12 38.1492 DE: -22 27 47.250 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 12 38.1491 DE: -22 27 47.250 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (234) Barbara asteroid class: Barbarian approx. diameter [km]: 46 approx. diameter ["]: 0.057 distance from Earth [AU]: 1.10670 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#105 date of fit: 2023 Aug 22 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): 0.016", 0.001", 96.324° remarks: * orbital elements for (234)Barbara : Mean anomaly = 356.0500904258 deg Arg. of pericenter = 192.4061891034 deg Long. of node = 144.4909185333 deg Inclination = 15.3753797684 deg Eccentricity = 0.2451017593 Semimajor axis = 2.3853733602 AU Perihelion dist = 1.8007141531 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 60213.64506945 TDT (2023 Sep 26.6451) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1052023Aug22,4.96,2023,9,26,15.479586,0.018659,0.037063,4.665708,-2.359725,0.004260,0.001062,0.000000,0.000000 66.1373,-22.3927,-54.35,-1.31,False TYC 6327-01453-1,20.21059702,-22.4631249,0.00,11.48,0.00,0.0,0,,20.23398124,-22.3926665,0.97,0.00,0,0,0 234,Barbara,11.88,45.900,1.1067,0,0,2.675,-18.74,,2.6,0 0,355.8775,2023,9,26,192.4062,144.4909,15.3754,0.24510,2.38537,1.80071,9.09,5.0,0.15 1.099,0.0157,0.0014,96,0.0157,Known errors,-1.00,0,-1,-1 20230926_1453-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org