IOTA/IOTA-ES occultation update for (234) Barbara / TYC 6359-01093-1 event on 2012 Sep 13, 16:38 UT Visible from SW Asia, Arabia Summary ------- On 2012 Sep 13 UT, the 48 km diameter asteroid (234) Barbara will occult a 10.3 mag star in the constellation Capricornus for observers along a path across SW Asia, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 11.1 mag (the magnitude of the asteroid) for at most 8.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 88 * date and approx. time of event: 2012 Sep 13, 16:22 - 2012 Sep 13, 16:53 UT * geocentric midpoint of event [JD]: 2456184.19382917 * magnitude of target star: 10.3 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 8.4 * Moon: 7 % sunlit, 168° distance * Sun: 143° distance * rough path description: SW Asia, Arabia The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 0.56 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .035", 90° ) * approx speed of asteroid's shadow [km/s]: 5.6774 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6359-01093-1 by 234 Barbara on 2012 Sep 13 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 33 12 38 47 12 34 16 22 14 10 137 -4 33 54 42 46 59 8 32 28 24 47 27 1 34 39 36 46 45 8 31 35 47 47 44 40 37 45 46 42 40 22 16 22 40 15 140 -8 38 15 3 42 32 56 37 15 53 42 48 6 38 47 10 42 24 57 36 41 37 42 57 9 40 28 22 39 11 4 16 23 6 20 142 -11 40 52 59 39 5 47 40 3 25 39 16 31 41 20 12 39 0 3 39 35 3 39 22 51 42 23 48 36 11 36 16 23 32 23 143 -13 42 45 52 36 7 28 42 1 32 36 15 51 43 10 20 36 2 59 41 36 19 36 20 46 43 52 15 33 30 44 16 23 58 26 143 -15 44 12 38 33 27 20 43 31 42 33 34 13 44 35 17 33 23 37 43 8 29 33 38 15 45 3 0 31 2 54 16 24 24 28 144 -17 45 22 12 31 0 1 44 43 41 31 5 52 45 43 33 30 56 52 44 21 54 31 9 17 46 1 14 28 44 55 16 24 50 31 144 -19 46 19 31 28 42 24 45 42 50 28 47 29 46 39 54 28 39 40 45 22 7 28 50 27 46 50 5 26 34 40 16 25 16 33 144 -20 47 7 40 26 32 27 46 32 25 26 36 56 47 27 16 26 30 1 46 12 31 26 39 33 47 31 39 24 30 43 16 25 42 35 144 -21 47 48 40 24 28 44 47 14 34 24 32 45 48 7 38 24 26 34 46 55 20 24 35 6 48 7 23 22 32 1 16 26 8 37 144 -22 48 23 55 22 30 13 47 50 46 22 33 52 48 42 22 22 28 16 47 32 5 22 35 59 48 38 19 20 37 47 16 26 34 39 143 -23 48 54 28 20 36 8 48 22 6 20 39 28 49 12 30 20 34 21 48 3 52 20 41 24 49 5 15 18 47 22 16 27 0 41 143 -24 49 21 5 18 45 52 48 49 23 18 48 55 49 38 44 18 44 13 48 31 32 18 50 42 49 28 47 17 0 18 16 27 26 42 143 -25 49 44 20 16 58 54 49 13 12 17 1 44 50 1 41 16 57 22 48 55 41 17 3 23 49 49 24 15 16 9 16 27 52 44 142 -26 50 4 42 15 14 51 49 34 3 15 17 29 50 21 47 15 13 26 49 16 48 15 19 1 50 7 27 13 34 36 16 28 18 46 141 -26 50 22 32 13 33 22 49 52 18 13 35 51 50 39 24 13 32 3 49 35 18 13 37 17 50 23 14 11 55 21 16 28 44 47 141 -27 50 38 10 11 54 12 50 8 17 11 56 32 50 54 49 11 52 57 49 51 29 11 57 53 50 37 2 10 18 11 16 29 10 49 140 -28 50 51 48 10 17 6 50 22 13 10 19 17 51 8 18 10 15 55 50 5 35 10 20 34 50 49 1 8 42 52 16 29 36 50 139 -28 51 3 39 8 41 50 50 34 20 8 43 55 51 20 1 8 40 44 50 17 51 8 45 8 50 59 22 7 9 14 16 30 2 51 138 -29 51 13 54 7 8 16 50 44 48 7 10 14 51 30 8 7 7 12 50 28 26 7 11 24 51 8 13 5 37 8 16 30 28 53 137 -29 51 22 40 5 36 12 50 53 45 5 38 5 51 38 48 5 35 11 50 37 30 5 39 12 51 15 42 4 6 24 16 30 54 54 136 -30 51 30 5 4 5 31 51 1 19 4 7 19 51 46 8 4 4 33 50 45 9 4 8 23 51 21 55 2 36 56 16 31 20 55 135 -30 51 36 14 2 36 5 51 7 35 2 37 49 51 52 13 2 35 9 50 51 29 2 38 50 51 26 57 1 8 36 16 31 46 56 133 -30 51 41 13 1 7 47 51 12 40 1 9 27 51 57 9 1 6 53 50 56 37 1 10 26 51 30 53 - 0 18 41 16 32 12 57 132 -31 51 45 6 - 0 19 28 51 16 37 - 0 17 51 52 1 1 - 0 20 20 51 0 37 - 0 16 54 51 33 45 - 1 45 1 16 32 37 58 130 -31 51 47 57 - 1 45 47 51 19 31 - 1 44 13 52 3 50 - 1 46 37 51 3 32 - 1 43 18 51 35 37 - 3 10 30 16 33 3 59 129 -31 51 49 49 - 3 11 14 51 21 24 - 3 9 43 52 5 41 - 3 12 3 51 5 26 - 3 8 49 51 36 32 - 4 35 11 16 33 29 60 127 -31 51 50 44 - 4 35 55 51 22 19 - 4 34 26 52 6 37 - 4 36 42 51 6 21 - 4 33 33 51 36 33 - 5 59 10 16 33 55 61 125 -31 51 50 45 - 5 59 52 51 22 18 - 5 58 26 52 6 39 - 6 0 39 51 6 20 - 5 57 34 51 35 40 - 7 22 30 16 34 21 62 123 -31 51 49 54 - 7 23 12 51 21 24 - 7 21 47 52 5 48 - 7 23 57 51 5 24 - 7 20 56 51 33 55 - 8 45 15 16 34 47 63 121 -31 51 48 11 - 8 45 56 51 19 37 - 8 44 33 52 4 8 - 8 46 40 51 3 35 - 8 43 43 51 31 19 -10 7 29 16 35 13 64 118 -31 51 45 38 -10 8 9 51 16 59 -10 6 47 52 1 38 -10 8 53 51 0 54 -10 5 59 51 27 54 -11 29 15 16 35 39 64 116 -31 51 42 16 -11 29 55 51 13 31 -11 28 34 51 58 19 -11 30 38 50 57 22 -11 27 46 51 23 39 -12 50 36 16 36 5 65 113 -31 51 38 5 -12 51 16 51 9 12 -12 49 55 51 54 12 -12 51 58 50 53 0 -12 49 8 51 18 35 -14 11 36 16 36 31 65 111 -31 51 33 5 -14 12 15 51 4 4 -14 10 55 51 49 17 -14 12 57 50 47 46 -14 10 8 51 12 42 -15 32 17 16 36 57 66 108 -31 51 27 17 -15 32 55 50 58 6 -15 31 36 51 43 35 -15 33 37 50 41 43 -15 30 49 51 5 59 -16 52 41 16 37 23 66 105 -31 51 20 40 -16 53 20 50 51 18 -16 52 1 51 37 4 -16 54 2 50 34 48 -16 51 14 50 58 26 -18 12 53 16 37 49 67 102 -31 51 13 13 -18 13 32 50 43 39 -18 12 13 51 29 44 -18 14 14 50 27 2 -18 11 26 50 50 3 -19 32 54 16 38 15 67 99 -31 51 4 56 -19 33 33 50 35 8 -19 32 14 51 21 35 -19 34 15 50 18 24 -19 31 27 50 40 47 -20 52 47 16 38 41 67 96 -31 50 55 47 -20 53 26 50 25 44 -20 52 7 51 12 34 -20 54 8 50 8 52 -20 51 20 50 30 37 -22 12 35 16 39 7 67 93 -30 50 45 46 -22 13 14 50 15 26 -22 11 54 51 2 42 -22 13 57 49 58 25 -22 11 6 50 19 32 -23 32 19 16 39 33 67 90 -30 50 34 50 -23 32 59 50 4 12 -23 31 38 50 51 56 -23 33 42 49 47 1 -23 30 50 50 7 29 -24 52 4 16 39 59 67 87 -30 50 22 57 -24 52 44 49 52 0 -24 51 22 50 40 14 -24 53 27 49 34 38 -24 50 33 49 54 26 -26 11 50 16 40 25 66 84 -29 50 10 4 -26 12 30 49 38 47 -26 11 7 50 27 33 -26 13 15 49 21 13 -26 10 18 49 40 21 -27 31 40 16 40 51 66 81 -29 49 56 10 -27 32 22 49 24 30 -27 30 57 50 13 52 -27 33 7 49 6 43 -27 30 6 49 25 9 -28 51 37 16 41 17 66 78 -28 49 41 10 -28 52 20 49 9 5 -28 50 53 49 59 5 -28 53 6 48 51 5 -28 50 1 49 8 46 -30 11 44 16 41 43 65 75 -28 49 25 1 -30 12 27 48 52 30 -30 10 58 49 43 11 -30 13 14 48 34 15 -30 10 6 48 51 9 -31 32 2 16 42 9 65 73 -28 49 7 38 -31 32 47 48 34 38 -31 31 15 49 26 4 -31 33 35 48 16 7 -31 30 21 48 32 12 -32 52 34 16 42 35 64 70 -27 48 48 56 -32 53 20 48 15 26 -32 51 46 49 7 39 -32 54 10 47 56 37 -32 50 50 48 11 49 -34 13 23 16 43 0 64 68 -27 48 28 50 -34 14 11 47 54 46 -34 12 34 48 47 51 -34 15 2 47 35 39 -34 11 36 47 49 53 -35 34 32 16 43 26 63 66 -26 48 7 12 -35 35 21 47 32 33 -35 33 40 48 26 33 -35 36 15 47 13 6 -35 32 41 47 26 17 -36 56 2 16 43 52 62 64 -25 47 43 55 -36 56 53 47 8 38 -36 55 9 48 3 38 -36 57 49 46 48 49 -36 54 7 47 0 52 -38 17 57 16 44 18 61 62 -25 47 18 51 -38 18 50 46 42 52 -38 17 1 47 38 57 -38 19 48 46 22 40 -38 15 57 46 33 27 -39 40 19 16 44 44 60 60 -24 46 51 48 -39 41 15 46 15 4 -39 39 21 47 12 20 -39 42 16 45 54 27 -39 38 14 46 3 51 -41 3 11 16 45 10 59 59 -23 46 22 36 -41 4 10 45 45 3 -41 2 10 46 43 35 -41 5 14 45 23 59 -41 1 0 45 31 49 -42 26 37 16 45 36 58 57 -23 45 51 1 -42 27 39 45 12 35 -42 25 33 46 12 28 -42 28 46 44 51 1 -42 24 18 44 57 5 -43 50 38 16 46 2 57 56 -22 45 16 46 -43 51 43 44 37 23 -43 49 30 45 38 45 -43 52 54 44 15 16 -43 48 12 44 19 21 -45 15 18 16 46 28 56 55 -21 44 39 32 -45 16 27 43 59 7 -45 14 6 45 2 7 -45 17 42 43 36 25 -45 12 43 43 38 13 -46 40 39 16 46 54 55 54 -20 43 58 59 -46 41 53 43 17 25 -46 39 23 44 22 12 -46 43 13 42 54 6 -46 37 55 42 53 16 -48 6 45 16 47 20 54 53 -20 43 14 39 -48 8 4 42 31 51 -48 5 24 43 38 33 -48 9 30 42 7 49 -48 3 50 42 3 57 -49 33 39 16 47 46 53 53 -19 42 26 1 -49 35 4 41 41 51 -49 32 12 42 50 41 -49 36 36 41 17 4 -49 30 31 41 9 39 -51 1 23 16 48 12 51 52 -18 41 32 27 -51 2 54 40 46 48 -50 59 49 41 57 58 -51 4 33 40 21 10 -50 58 1 40 9 34 -52 29 59 16 48 38 50 52 -17 40 33 13 -52 31 38 39 45 54 -52 28 18 40 59 39 -52 33 26 39 19 20 -52 26 21 39 2 48 -53 59 31 16 49 4 48 52 -16 39 27 21 -54 1 18 38 38 12 -53 57 40 39 54 49 -54 3 15 38 10 36 -53 55 33 37 48 9 -55 29 58 16 49 30 47 52 -15 38 13 43 -55 31 55 37 22 32 -55 27 57 38 42 20 -55 34 3 36 53 47 -55 25 38 36 24 11 -57 1 21 16 49 56 46 52 -14 36 50 54 -57 3 30 35 57 25 -56 59 8 37 20 47 -57 5 50 35 27 24 -56 56 35 34 49 5 -58 33 38 16 50 22 44 53 -13 35 17 4 -58 36 1 34 21 2 -58 31 11 35 48 23 -58 38 37 33 49 36 -58 28 23 33 0 31 -60 6 45 16 50 48 42 53 -11 33 29 57 -60 9 25 32 31 3 -60 4 2 34 2 53 -60 12 18 31 58 0 -60 0 55 30 55 31 -61 40 35 16 51 14 41 54 -10 31 26 35 -61 43 34 30 24 26 -61 37 32 32 1 20 -61 46 49 29 49 34 -61 34 1 28 30 12 -63 14 51 16 51 40 39 56 -9 29 3 5 -63 18 14 27 57 16 -63 11 24 29 39 54 -63 21 55 27 20 23 -63 7 26 25 39 25 -64 49 10 16 52 6 37 58 -7 26 14 23 -64 53 2 25 4 26 -64 45 13 26 53 32 -64 57 15 24 25 15 -64 40 41 22 16 23 -66 22 52 16 52 32 35 60 -6 22 53 41 -66 27 20 21 39 6 -66 18 18 23 35 27 -66 32 13 20 57 21 -66 13 4 18 12 1 -67 54 50 16 52 57 33 64 -4 18 51 52 -68 0 3 17 32 11 -67 49 29 19 36 33 -68 5 46 16 47 37 -67 43 23 13 14 10 -69 23 18 16 53 23 31 68 -2 13 56 47 -69 29 29 12 31 38 -69 16 59 14 44 36 -69 36 16 11 44 5 -69 9 45 7 7 6 -70 45 22 16 53 49 28 73 0 7 52 27 -70 52 49 6 21 53 -70 37 48 8 43 24 -71 0 58 5 31 23 -70 29 8 Uncertainty in time = +/- 5 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 6359-01093-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 12 02.2937 DE: -21 22 58.152 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .032 ) * V mag [mag]: 10.3 * B mag [mag]: 10.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (234) Barbara approx. diameter [km]: 48 approx. diameter ["]: .074 distance from Earth [AU]: 0.89900 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 2763 number of rejected observations: 102 time covered by the observations: 1916 Jun 07 - 2012 Sep 04 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.013, 90° remarks: * orbital elements for (234) Barbara : Mean anomaly = 358.33911125 deg Arg. of pericenter = 192.20732468 deg Long. of node = 144.60882911 deg Inclination = 15.35371033 deg Eccentricity = 0.24367355 Semimajor axis = 2.38617089 AU Perihelion dist = 1.80472415 AU Mag: H = 9.11, G = 0.15 Epoch of elements : MJD 56183.69400000 TDT (2012 Sep 13.694) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 13 234 Barbara 16h 39.1m UT 10.3 21 12 2.294-21 22 58.15TYC 6359-01093-1 10.4 11.1 48 8.4 0.899 0.260 -31.10 75.1573 -21.374 -70.85 3.45 16.6519 -0.38906 -0.04421 0.36882 -3.18318 0.00274 0.00121 2000 357.3513572012 910.00000192.207325144.608829 15.3537100.24367355 2.3861709 1.8047242 9.0 5.00.15 RATE 2.6739410 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.035 90 1.56 0.041 1 21 24 0-3-2 056178.0020120913_1093-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org