IOTA/IOTA-ES occultation update for (234) Barbara / TYC 6906-00995-1 event on 2023 Oct 02, 03:03 UT Visible from South America Summary ------- On 2023 Oct 02 UT, the 45.9 km diameter asteroid (234) Barbara will occult a 9.8 mag star in the constellation Capricornus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.33 mag to 12.00 mag (the magnitude of the asteroid) for at most 4.370 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 Oct 02, 02:53 - 2023 Oct 02, 03:13 * geocentric midpoint of event [JD]: 2460219.62747088 * magnitude of target star: 9.80 * magnitude drop [mag]: 2.33 * estimated maximum duration [s]: 4.370 * Moon: 90 % sunlit, 103° distance * Sun: 113° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 10.5128 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6906-00995-1 by 234 Barbara on 2023 Oct 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 172 0 0 22 41 32 2 53 30.3 1 115 45 22 27 43 22 55 20 22 25 57 22 57 6 .... 173 0 0 22 15 2 2 53 30.5 2 116 44 22 1 12 22 28 53 21 59 26 22 30 40 0.03 174 0 0 21 48 8 2 53 30.9 3 116 43 21 34 15 22 2 0 21 32 29 22 3 47 -0.01 175 0 0 21 20 47 2 53 31.5 4 116 43 21 6 53 21 34 42 21 5 6 21 36 29 -0.03 176 0 0 20 53 1 2 53 32.3 5 117 42 20 39 5 21 6 58 20 37 18 21 8 45 -0.05 177 0 0 20 24 51 2 53 33.3 6 117 42 20 10 53 20 38 49 20 9 5 20 40 37 -0.05 178 0 0 19 56 16 2 53 34.5 7 117 41 19 42 16 20 10 16 19 40 28 20 12 4 -0.06 179 0 0 19 27 17 2 53 35.9 8 118 40 19 13 15 19 41 19 19 11 27 19 43 7 -0.06 -180 0 0 18 57 54 2 53 37.6 9 118 40 18 43 50 19 11 58 18 42 2 19 13 46 -0.06 -179 0 0 18 28 8 2 53 39.5 10 118 39 18 14 2 18 42 14 18 12 14 18 44 2 -0.07 -178 0 0 17 57 59 2 53 41.6 11 119 38 17 43 52 18 12 7 17 42 3 18 13 56 -0.07 -177 0 0 17 27 28 2 53 43.9 12 119 37 17 13 20 17 41 38 17 11 30 17 43 27 -0.07 -176 0 0 16 56 36 2 53 46.5 13 119 37 16 42 26 17 10 47 16 40 36 17 12 36 -0.07 -175 0 0 16 25 23 2 53 49.3 14 120 36 16 11 11 16 39 35 16 9 21 16 41 25 -0.07 -174 0 0 15 53 49 2 53 52.3 15 120 35 15 39 35 16 8 3 15 37 46 16 9 53 -0.07 -173 0 0 15 21 56 2 53 55.5 17 120 34 15 7 41 15 36 12 15 5 51 15 38 2 -0.07 -172 0 0 14 49 44 2 53 59.0 18 121 33 14 35 27 15 4 1 14 33 37 15 5 51 -0.07 -171 0 0 14 17 14 2 54 2.8 19 121 33 14 2 56 14 31 32 14 1 5 14 33 22 -0.07 -170 0 0 13 44 26 2 54 6.8 20 121 32 13 30 7 13 58 46 13 28 16 14 0 36 -0.07 -169 0 0 13 11 22 2 54 11.0 21 121 31 12 57 1 13 25 43 12 55 10 13 27 33 -0.08 -168 0 0 12 38 2 2 54 15.4 22 122 30 12 23 40 12 52 24 12 21 49 12 54 15 -0.08 -167 0 0 12 4 27 2 54 20.1 23 122 29 11 50 4 12 18 50 11 48 13 12 20 41 -0.08 -166 0 0 11 30 38 2 54 25.1 25 122 28 11 16 14 11 45 2 11 14 23 11 46 53 -0.08 -165 0 0 10 56 36 2 54 30.3 26 122 27 10 42 11 11 11 1 10 40 20 11 12 53 -0.08 -164 0 0 10 22 22 2 54 35.7 27 122 27 10 7 57 10 36 48 10 6 6 10 38 40 -0.08 -163 0 0 9 47 57 2 54 41.4 28 123 26 9 33 31 10 2 24 9 31 40 10 4 16 -0.08 -162 0 0 9 13 23 2 54 47.3 29 123 25 8 58 55 9 27 50 8 57 4 9 29 41 -0.08 -161 0 0 8 38 39 2 54 53.4 30 123 24 8 24 11 8 53 7 8 22 20 8 54 58 -0.08 -160 0 0 8 3 47 2 54 59.8 31 123 23 7 49 19 8 18 15 7 47 27 8 20 7 -0.08 -159 0 0 7 28 48 2 55 6.4 33 123 22 7 14 20 7 43 17 7 12 28 7 45 9 -0.08 -158 0 0 6 53 44 2 55 13.3 34 124 21 6 39 15 7 8 13 6 37 24 7 10 5 -0.08 -157 0 0 6 18 35 2 55 20.3 35 124 20 6 4 6 6 33 5 6 2 15 6 34 56 -0.08 -156 0 0 5 43 23 2 55 27.6 36 124 19 5 28 54 5 57 53 5 27 3 5 59 44 -0.08 -155 0 0 5 8 9 2 55 35.2 37 124 18 4 53 40 5 22 38 4 51 48 5 24 30 -0.08 -154 0 0 4 32 53 2 55 42.9 39 124 17 4 18 24 4 47 23 4 16 33 4 49 14 -0.08 -153 0 0 3 57 38 2 55 50.8 40 124 16 3 43 9 4 12 7 3 41 18 4 13 59 -0.08 -152 0 0 3 22 24 2 55 59.0 41 125 15 3 7 55 3 36 52 3 6 4 3 38 44 -0.08 -151 0 0 2 47 12 2 56 7.4 42 125 14 2 32 44 3 1 40 2 30 52 3 3 32 -0.08 -150 0 0 2 12 4 2 56 15.9 43 125 13 1 57 36 2 26 32 1 55 45 2 28 23 -0.08 -149 0 0 1 37 1 2 56 24.7 44 125 12 1 22 34 1 51 28 1 20 42 1 53 19 -0.08 -148 0 0 1 2 3 2 56 33.6 46 125 11 0 47 37 1 16 30 0 45 46 1 18 21 -0.09 -147 0 0 0 27 13 2 56 42.7 47 125 10 0 12 48 0 41 39 0 10 57 0 43 30 -0.09 -146 0 0 - 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37 0 0 -18 34 30 3 13 3.7 19 251 -64 -18 47 33 -18 21 26 -18 49 14 -18 19 45 -0.09 - 36 0 0 -18 16 51 3 13 7.1 18 251 -64 -18 29 56 -18 3 46 -18 31 37 -18 2 5 -0.09 - 35 0 0 -17 58 44 3 13 10.3 17 251 -64 -18 11 50 -17 45 36 -18 13 31 -17 43 55 -0.09 - 34 0 0 -17 40 7 3 13 13.4 16 250 -63 -17 53 15 -17 26 58 -17 54 57 -17 25 17 -0.09 - 33 0 0 -17 21 1 3 13 16.2 15 250 -63 -17 34 12 -17 7 50 -17 35 53 -17 6 9 -0.09 - 32 0 0 -17 1 27 3 13 18.9 14 250 -62 -17 14 39 -16 48 14 -17 16 21 -16 46 32 -0.09 - 31 0 0 -16 41 24 3 13 21.4 13 249 -62 -16 54 38 -16 28 9 -16 56 20 -16 26 27 -0.09 - 30 0 0 -16 20 52 3 13 23.8 12 249 -61 -16 34 8 -16 7 36 -16 35 51 -16 5 54 -0.09 - 29 0 0 -15 59 53 3 13 25.9 11 249 -61 -16 13 11 -15 46 35 -16 14 53 -15 44 52 -0.08 - 28 0 0 -15 38 26 3 13 27.9 10 249 -60 -15 51 45 -15 25 5 -15 53 28 -15 23 23 -0.08 - 27 0 0 -15 16 30 3 13 29.6 9 248 -60 -15 29 52 -15 3 8 -15 31 35 -15 1 25 -0.08 - 26 0 0 -14 54 8 3 13 31.2 8 248 -59 -15 7 32 -14 40 44 -15 9 15 -14 39 1 -0.08 - 25 0 0 -14 31 18 3 13 32.6 7 248 -59 -14 44 44 -14 17 52 -14 46 27 -14 16 9 -0.08 - 24 0 0 -14 8 2 3 13 33.8 6 248 -58 -14 21 29 -13 54 34 -14 23 13 -13 52 50 -0.07 - 23 0 0 -13 44 19 3 13 34.8 4 247 -57 -13 57 48 -13 30 49 -13 59 32 -13 29 5 -0.07 - 22 0 0 -13 20 9 3 13 35.6 3 247 -57 -13 33 41 -13 6 38 -13 35 25 -13 4 53 -0.06 - 21 0 0 -12 55 34 3 13 36.1 2 247 -56 -13 9 8 -12 42 1 -13 10 52 -12 40 16 -0.05 - 20 0 0 -12 30 34 3 13 36.5 1 247 -55 -12 44 9 -12 16 58 -12 45 54 -12 15 14 -0.02 - 19 0 0 -12 5 8 3 13 36.7 0 247 -55 -12 18 45 -11 51 31 -12 20 30 -11 49 46 0.26 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 6906-00995-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 18 58.2418 DE: -23 04 36.550 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 18 58.2416 DE: -23 04 36.551 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.8 * 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 ["]: 0.055 distance from Earth [AU]: 1.15350 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): 0.015", 0.001", 96.361° remarks: * orbital elements for (234)Barbara : Mean anomaly = 357.5164923061 deg Arg. of pericenter = 192.4067589726 deg Long. of node = 144.4909142356 deg Inclination = 15.3753705041 deg Eccentricity = 0.2451036234 Semimajor axis = 2.3853787938 AU Perihelion dist = 1.8007138082 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 60219.12756944 TDT (2023 Oct 02.1276) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1052023Aug22,4.37,2023,10,2,3.059301,0.033840,0.098337,5.612899,-1.924594,0.004391,0.001152,0.000000,0.000000 -111.3781,-23.0035,131.50,-3.44,False TYC 6906-00995-1,20.31617829,-23.0768194,0.00,9.80,0.00,0.0,0,,20.33957860,-23.0034532,2.33,0.00,0,0,0 234,Barbara,12.00,45.900,1.1535,0,0,3.100,-14.66,,2.6,0 0,357.4824,2023,10,2,192.4068,144.4909,15.3754,0.24510,2.38538,1.80071,9.09,5.0,0.15 1.064,0.0150,0.0014,96,0.0151,Known errors,-1.00,0,-1,-1 20231002_0995-1,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org