IOTA/IOTA-ES occultation update for (1264) Letaba / TYC 1756-01836-1 event on 2012 Nov 10, 23:35 UT Visible from Caribbean, Venezuela, Colombia Summary ------- On 2012 Nov 10 UT, the 70 km diameter asteroid (1264) Letaba will occult a 11.7 mag star in the constellation Aries for observers along a path across Caribbean, Venezuela, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 14.2 mag (the magnitude of the asteroid) for at most 4.3 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: 85 * date and approx. time of event: 2012 Nov 10, 23:30 - 2012 Nov 10, 23:40 UT * geocentric midpoint of event [JD]: 2456242.483 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 4.3 * Moon: 12 % sunlit, 154° distance * Sun: 161° distance * rough path description: Caribbean, Venezuela, Colombia The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 90° ) * approx speed of asteroid's shadow [km/s]: 16.1668 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1756-01836-1 by 1264 Letaba on 2012 Nov 10 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 151 57 33 73 43 40 23 30 15 7 349 -3 150 0 30 74 58 18 153 48 28 72 9 35 147 28 51 76 12 33 156 5 20 69 5 25 149 53 42 79 12 43 23 30 23 13 347 -8 147 25 0 79 56 31 152 7 4 78 24 19 144 4 15 80 43 39 154 28 51 77 19 4 148 26 19 82 59 55 23 30 31 16 345 -12 144 47 34 83 33 19 151 35 10 82 23 18 139 40 0 84 9 0 154 47 46 81 35 7 147 9 33 86 5 40 23 30 39 19 344 -14 140 33 2 86 32 56 152 23 18 85 34 48 130 23 33 86 59 41 157 15 16 84 53 48 145 28 22 88 47 18 23 30 47 22 342 -16 119 14 22 89 6 36 159 7 16 88 18 49 75 48 58 89 4 58 167 35 7 87 39 25 - 33 25 28 88 47 17 23 30 55 24 163 -18 - 20 14 52 88 21 38 - 58 12 31 89 6 2 - 11 36 49 87 47 54 -102 0 44 89 6 14 - 34 54 4 86 33 46 23 31 4 26 161 -20 - 29 15 21 86 11 48 - 41 52 51 86 53 48 - 23 50 20 85 43 45 - 52 25 49 87 13 54 - 35 48 33 84 29 23 23 31 12 28 159 -22 - 32 9 30 84 9 23 - 39 56 45 84 48 19 - 28 19 37 83 44 20 - 45 38 44 85 9 10 - 36 36 0 82 32 18 23 31 20 30 158 -23 - 33 52 6 82 13 45 - 39 34 54 82 50 7 - 30 53 13 81 50 45 - 43 31 31 83 10 21 - 37 19 53 80 41 12 23 31 28 32 157 -24 - 35 7 46 80 23 50 - 39 41 11 80 58 3 - 32 40 21 80 2 23 - 42 43 51 81 17 26 - 38 1 24 78 55 8 23 31 36 33 156 -26 - 36 9 57 78 38 43 - 39 59 3 79 11 7 - 34 3 53 78 18 33 - 42 28 58 79 29 39 - 38 41 8 77 13 20 23 31 44 35 155 -27 - 37 4 14 76 57 45 - 40 22 31 77 28 34 - 35 13 34 76 38 40 - 42 30 26 77 46 19 - 39 19 26 75 35 14 23 31 52 36 154 -28 - 37 53 21 75 20 23 - 40 48 56 75 49 48 - 36 14 21 75 2 12 - 42 41 3 76 6 50 - 39 56 35 74 0 22 23 32 0 38 152 -29 - 38 38 51 73 46 8 - 41 17 0 74 14 20 - 37 8 58 73 28 45 - 42 57 13 74 30 43 - 40 32 45 72 28 20 23 32 8 39 151 -30 - 39 21 40 72 14 40 - 41 46 1 72 41 46 - 37 59 8 71 58 0 - 43 16 55 72 57 34 - 41 8 5 70 58 50 23 32 17 40 150 -30 - 40 2 25 70 45 40 - 42 15 33 71 11 47 - 38 45 56 70 29 37 - 43 38 58 71 27 2 - 41 42 42 69 31 34 23 32 25 41 148 -31 - 40 41 33 69 18 52 - 42 45 23 69 44 5 - 39 30 8 69 3 24 - 44 2 40 69 58 50 - 42 16 43 68 6 21 23 32 33 42 147 -32 - 41 19 23 67 54 3 - 43 15 22 68 18 28 - 40 12 15 67 39 6 - 44 27 31 68 32 45 - 42 50 12 66 42 57 23 32 41 43 146 -33 - 41 56 7 66 31 2 - 43 45 24 66 54 42 - 40 52 42 66 16 33 - 44 53 12 67 8 34 - 43 23 13 65 21 12 23 32 49 44 144 -33 - 42 31 59 65 9 39 - 44 15 28 65 32 37 - 41 31 46 64 55 35 - 45 19 31 65 46 5 - 43 55 52 64 0 58 23 32 57 45 143 -34 - 43 7 5 63 49 44 - 44 45 31 64 12 3 - 42 9 41 63 36 4 - 45 46 19 64 25 10 - 44 28 9 62 42 6 23 33 5 46 142 -34 - 43 41 34 62 31 10 - 45 15 33 62 52 54 - 42 46 40 62 17 52 - 46 13 30 63 5 40 - 45 0 10 61 24 29 23 33 13 47 140 -35 - 44 15 30 61 13 50 - 45 45 33 61 35 1 - 43 22 50 61 0 53 - 46 40 58 61 47 28 - 45 31 56 60 8 1 23 33 21 48 138 -35 - 44 49 0 59 57 37 - 46 15 31 60 18 17 - 43 58 20 59 45 0 - 47 8 42 60 30 26 - 46 3 31 58 52 36 23 33 30 49 137 -36 - 45 22 8 58 42 27 - 46 45 29 59 2 38 - 44 33 15 58 30 8 - 47 36 39 59 14 30 - 46 34 55 57 38 9 23 33 38 49 135 -36 - 45 54 57 57 28 14 - 47 15 27 57 47 57 - 45 7 41 57 16 12 - 48 4 48 57 59 34 - 47 6 12 56 24 36 23 33 46 50 134 -36 - 46 27 31 56 14 54 - 47 45 25 56 34 11 - 45 41 43 56 3 7 - 48 33 8 56 45 32 - 47 37 24 55 11 51 23 33 54 51 132 -37 - 46 59 52 55 2 21 - 48 15 24 55 21 14 - 46 15 26 54 50 50 - 49 1 39 55 32 21 - 48 8 32 53 59 51 23 34 2 51 130 -37 - 47 32 3 53 50 33 - 48 45 27 54 9 2 - 46 48 51 53 39 16 - 49 30 20 54 19 56 - 48 39 38 52 48 32 23 34 10 52 128 -37 - 48 4 8 52 39 26 - 49 15 32 52 57 32 - 47 22 3 52 28 22 - 49 59 11 53 8 13 - 49 10 44 51 37 51 23 34 18 52 126 -37 - 48 36 7 51 28 55 - 49 45 43 51 46 41 - 47 55 6 51 18 5 - 50 28 13 51 57 8 - 49 41 51 50 27 44 23 34 26 53 125 -37 - 49 8 4 50 18 59 - 50 16 0 50 36 24 - 48 28 0 50 8 21 - 50 57 27 50 46 40 - 50 13 2 49 18 9 23 34 34 53 123 -37 - 49 40 1 49 9 33 - 50 46 23 49 26 39 - 49 0 50 48 59 7 - 51 26 53 49 36 43 - 50 44 17 48 9 2 23 34 43 53 121 -37 - 50 11 58 48 0 36 - 51 16 55 48 17 23 - 49 33 37 47 50 21 - 51 56 31 48 27 16 - 51 15 38 47 0 22 23 34 51 54 119 -37 - 50 43 59 46 52 5 - 51 47 37 47 8 34 - 50 6 24 46 42 1 - 52 26 23 47 18 16 - 51 47 8 45 52 4 23 34 59 54 117 -37 - 51 16 5 45 43 56 - 52 18 29 46 0 7 - 50 39 12 45 34 3 - 52 56 30 46 9 40 - 52 18 47 44 44 8 23 35 7 54 115 -37 - 51 48 17 44 36 8 - 52 49 33 44 52 3 - 51 12 4 44 26 25 - 53 26 51 45 1 25 - 52 50 37 43 36 30 23 35 15 54 113 -37 - 52 20 39 43 28 38 - 53 20 51 43 44 16 - 51 45 2 43 19 5 - 53 57 30 43 53 29 - 53 22 39 42 29 8 23 35 23 54 111 -37 - 52 53 10 42 21 24 - 53 52 23 42 36 47 - 52 18 8 42 12 1 - 54 28 25 42 45 50 - 53 54 56 41 22 0 23 35 31 54 109 -37 - 53 25 54 41 14 24 - 54 24 12 41 29 31 - 52 51 24 41 5 10 - 54 59 40 41 38 25 - 54 27 28 40 15 4 23 35 39 54 107 -36 - 53 58 52 40 7 36 - 54 56 19 40 22 28 - 53 24 52 39 58 31 - 55 31 15 40 31 13 - 55 0 18 39 8 18 23 35 47 54 105 -36 - 54 32 5 39 0 57 - 55 28 45 39 15 34 - 53 58 33 38 52 1 - 56 3 12 39 24 10 - 55 33 27 38 1 39 23 35 56 54 103 -36 - 55 5 37 37 54 25 - 56 1 32 38 8 48 - 54 32 30 37 45 38 - 56 35 32 38 17 16 - 56 6 58 36 55 6 23 36 4 54 101 -36 - 55 39 27 36 47 59 - 56 34 42 37 2 8 - 55 6 44 36 39 20 - 57 8 16 37 10 27 - 56 40 51 35 48 36 23 36 12 54 99 -35 - 56 13 40 35 41 36 - 57 8 16 35 55 31 - 55 41 18 35 33 6 - 57 41 27 36 3 42 - 57 15 10 34 42 8 23 36 20 54 97 -35 - 56 48 15 34 35 15 - 57 42 17 34 48 56 - 56 16 15 34 26 53 - 58 15 7 34 56 58 - 57 49 56 33 35 39 23 36 28 53 95 -34 - 57 23 17 33 28 53 - 58 16 47 33 42 20 - 56 51 35 33 20 39 - 58 49 17 33 50 14 - 58 25 11 32 29 7 23 36 36 53 94 -34 - 57 58 47 32 22 28 - 58 51 47 32 35 41 - 57 27 22 32 14 22 - 59 23 59 32 43 27 - 59 0 58 31 22 30 23 36 44 52 92 -34 - 58 34 47 31 15 58 - 59 27 21 31 28 58 - 58 3 38 31 8 0 - 59 59 16 31 36 35 - 59 37 19 30 15 46 23 36 52 52 90 -33 - 59 11 21 30 9 21 - 60 3 30 30 22 7 - 58 40 26 30 1 31 - 60 35 11 30 29 37 - 60 14 18 29 8 53 23 37 0 51 88 -32 - 59 48 30 29 2 34 - 60 40 18 29 15 7 - 59 17 48 28 54 53 - 61 11 45 29 22 28 - 60 51 57 28 1 48 23 37 9 51 87 -32 - 60 26 19 27 55 36 - 61 17 47 28 7 55 - 59 55 48 27 48 3 - 61 49 2 28 15 8 - 61 30 19 26 54 29 23 37 17 50 85 -31 - 61 4 49 26 48 24 - 61 56 0 27 0 29 - 60 34 28 26 40 59 - 62 27 6 27 7 33 - 62 9 27 25 46 53 23 37 25 50 84 -31 - 61 44 5 25 40 55 - 62 35 2 25 52 46 - 61 13 52 25 33 39 - 63 5 59 25 59 42 - 62 49 27 24 38 58 23 37 33 49 82 -30 - 62 24 10 24 33 7 - 63 14 55 24 44 43 - 61 54 5 24 25 59 - 63 45 45 24 51 31 - 63 30 21 23 30 41 23 37 41 48 81 -29 - 63 5 8 23 24 57 - 63 55 45 23 36 19 - 62 35 9 23 17 58 - 64 26 30 23 42 57 - 64 12 14 22 21 58 23 37 49 47 79 -28 - 63 47 5 22 16 22 - 64 37 35 22 27 28 - 63 17 9 22 9 31 - 65 8 16 22 33 57 - 64 55 12 21 12 46 23 37 57 47 78 -28 - 64 30 5 21 7 18 - 65 20 31 21 18 9 - 64 0 11 21 0 37 - 65 51 11 21 24 28 - 65 39 20 20 3 3 23 38 5 46 77 -27 - 65 14 13 19 57 42 - 66 4 39 20 8 17 - 64 44 20 19 51 11 - 66 35 18 20 14 26 - 66 24 45 18 52 43 23 38 13 45 76 -26 - 65 59 36 18 47 31 - 66 50 5 18 57 49 - 65 29 42 18 41 9 - 67 20 46 19 3 47 - 67 11 33 17 41 43 23 38 21 44 74 -25 - 66 46 22 17 36 40 - 67 36 57 17 46 40 - 66 16 24 17 30 29 - 68 7 42 17 52 27 - 67 59 53 16 29 58 23 38 30 43 73 -24 - 67 34 37 16 25 4 - 68 25 22 16 34 45 - 67 4 34 16 19 4 - 68 56 14 16 40 21 - 68 49 54 15 17 23 23 38 38 42 72 -23 - 68 24 31 15 12 39 - 69 15 30 15 21 59 - 67 54 21 15 6 50 - 69 46 32 15 27 23 - 69 41 48 14 3 51 23 38 46 40 71 -22 - 69 16 16 13 59 18 - 70 7 33 14 8 17 - 68 45 55 13 53 42 - 70 38 47 14 13 26 - 70 35 45 12 49 16 23 38 54 39 70 -21 - 70 10 2 12 44 55 - 71 1 43 12 53 30 - 69 39 28 12 39 32 - 71 33 13 12 58 25 - 71 32 3 11 33 30 23 39 2 38 69 -20 - 71 6 4 11 29 22 - 71 58 16 11 37 31 - 70 35 13 11 24 14 - 72 30 5 11 42 10 - 72 30 57 10 16 24 23 39 10 37 69 -18 - 72 4 40 10 12 30 - 72 57 29 10 20 11 - 71 33 28 10 7 38 - 73 29 42 10 24 32 - 73 32 48 8 57 48 23 39 18 35 68 -17 - 73 6 9 8 54 9 - 73 59 44 9 1 18 - 72 34 32 8 49 35 - 74 32 27 9 5 19 - 74 38 4 7 37 27 23 39 26 34 67 -16 - 74 10 57 7 34 6 - 75 5 28 7 40 39 - 73 38 49 7 29 52 - 75 38 47 7 44 17 - 75 47 14 6 15 7 23 39 34 32 66 -14 - 75 19 34 6 12 5 - 76 15 14 6 17 58 - 74 46 47 6 8 15 - 76 49 18 6 21 9 - 77 1 1 4 50 27 23 39 43 31 66 -13 - 76 32 39 4 47 49 - 77 29 45 4 52 53 - 75 59 5 4 44 26 - 78 4 45 4 55 34 - 78 20 16 3 23 2 23 39 51 29 65 -11 - 77 51 2 3 20 52 - 78 49 55 3 24 59 - 77 16 29 3 18 1 - 79 26 5 3 27 3 - 79 46 11 1 52 19 23 39 59 27 65 -9 - 79 15 50 1 50 44 - 80 17 0 1 53 41 - 78 40 2 1 48 31 - 80 54 40 1 54 58 - 81 20 23 0 17 32 23 40 7 25 64 -7 - 80 48 36 0 16 39 - 81 52 45 0 18 8 - 80 11 11 0 15 14 - 82 32 24 0 18 27 - 83 5 17 - 1 22 27 23 40 15 23 64 -5 - 82 31 33 - 1 22 24 - 83 39 45 - 1 22 51 - 81 51 59 - 1 22 46 - 84 22 8 - 1 23 50 - 85 4 41 - 3 9 21 23 40 23 20 64 -3 - 84 28 11 - 3 8 0 - 85 42 10 - 3 11 10 - 83 45 34 - 3 6 56 - 86 28 34 - 3 14 0 - 87 25 13 - 5 6 10 23 40 31 17 64 0 - 86 44 24 - 5 2 50 - 88 7 30 - 5 10 10 - 85 57 10 - 4 59 39 - 89 0 26 - 5 15 59 Uncertainty in time = +/- 3 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 1756-01836-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 47 37.5140 DE: +23 08 51.885 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .019 ) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1264) Letaba approx. diameter [km]: 70 approx. diameter ["]: .045 distance from Earth [AU]: 2.16000 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 912 number of rejected observations: 54 time covered by the observations: 1933 Apr 20 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.014, 91° remarks: * orbital elements for (1264) Letaba : Mean anomaly = 116.54131318 deg Arg. of pericenter = 30.24775241 deg Long. of node = 235.23812644 deg Inclination = 25.01931405 deg Eccentricity = 0.15580677 Semimajor axis = 2.86385760 AU Perihelion dist = 2.41764919 AU Mag: H = 9.51, G = 0.15 Epoch of elements : MJD 56241.98300000 TDT (2012 Nov 10.983) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 10 1264 Letaba 23h 35.5m UT 11.7 1 47 37.514 23 8 51.88TYC 1756-01836-1 12.1 14.2 70 4.3 2.160 -1.702 -28.77 -17.4989 23.156 -177.87 -17.46 23.5920 -0.44817 0.36636 -5.76964 -7.06943 0.00188 -0.00048 2000 116.138040201211 9.00000 30.247752235.238126 25.0193140.15580677 2.8638576 2.4176492 9.6 5.00.15 RATE 2.0336530 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.024 90 1.60 0.027 0 0 0 5 056226.0020121110_1836-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org