IOTA/IOTA-ES occultation update for (1349) Bechuana / TYC 0571-00600-1 event on 2008 Oct 11, 11:47 UT Visible from E Russia Summary ------- On 2008 Oct 11 UT, the 30 km diameter asteroid (1349) Bechuana will occult a 10.2 mag star in the constellation Pegasus for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 15.0 mag (the magnitude of the asteroid) for at most 4.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 42 * date and approx. time of event: 2008 Oct 11, 11:39 - 2008 Oct 11, 11:52 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 4.2 * Moon: 86 % sunlit, 12° distance * Sun: 143° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 1.56 * 1 sigma uncertainty interval [seconds]: +/- 8.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .030", 66° ) * approx speed of asteroid's shadow [km/s]: 7.2226 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0571-00600-1 by 1349 Bechuana on 2008 Oct 11 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 -132 26 28 85 23 43 11 39 32 4 262 -10 -149 6 24 84 55 2 - 96 1 41 84 52 26 -171 29 23 82 56 17 ... .. .. .. .. .. -176 1 3 83 48 28 11 39 44 8 219 -13 -179 44 13 83 7 57 -170 46 6 84 30 56 173 27 10 81 13 33 -120 50 50 86 23 16 168 24 11 81 54 59 11 39 56 10 204 -15 167 12 8 81 19 25 169 55 0 82 32 24 164 40 21 79 37 56 178 51 36 84 44 28 159 54 15 80 12 35 11 40 8 13 195 -16 159 30 54 79 41 11 160 22 30 80 45 17 158 39 25 78 10 6 162 42 54 82 37 46 154 14 16 78 40 10 11 40 21 14 189 -17 154 11 25 78 11 54 154 18 11 79 9 22 154 7 28 76 48 51 154 40 42 80 47 43 150 0 59 77 15 36 11 40 33 16 185 -18 150 8 12 76 49 44 149 53 34 77 42 10 150 29 34 75 33 1 149 28 50 79 10 22 146 38 52 75 57 15 11 40 45 17 182 -19 146 51 30 75 33 17 146 25 34 76 21 46 147 27 23 74 21 41 145 38 47 77 42 18 143 49 56 74 43 55 11 40 57 18 179 -19 144 5 39 74 21 29 143 33 24 75 6 47 144 50 16 73 14 9 142 35 26 76 21 20 141 24 1 73 34 44 11 41 9 19 176 -20 141 41 33 73 13 36 141 5 38 73 56 14 142 31 34 72 9 50 140 1 50 75 5 57 139 14 53 72 29 4 11 41 21 21 174 -20 139 33 30 72 9 1 138 55 28 72 49 25 140 26 55 71 8 20 137 48 37 73 55 7 137 18 29 71 26 24 11 41 34 21 172 -20 137 37 42 71 7 17 136 58 28 71 45 46 138 33 15 70 9 16 135 50 11 72 48 4 135 31 59 70 26 20 11 41 46 22 170 -21 135 51 33 70 8 2 135 11 40 70 44 51 136 48 22 69 12 22 134 2 52 71 44 13 133 53 24 69 28 33 11 41 58 23 168 -21 134 13 8 69 10 58 133 32 58 69 46 19 135 10 42 68 17 23 132 24 13 70 43 9 132 21 16 68 32 47 11 42 10 24 166 -21 132 41 3 68 15 51 132 0 51 68 49 53 133 38 59 67 24 7 130 52 28 69 44 29 130 54 29 67 38 50 11 42 22 25 165 -21 131 14 14 67 22 28 130 34 8 67 55 21 132 12 16 66 32 25 129 26 19 68 47 56 129 32 11 66 46 30 11 42 35 25 163 -21 129 51 51 66 30 40 129 11 58 67 2 29 130 49 49 65 42 8 128 4 50 67 53 18 128 13 42 65 55 39 11 42 47 26 162 -21 128 33 14 65 40 17 127 53 38 66 11 8 129 31 1 64 53 8 126 47 14 67 0 20 126 58 28 65 6 8 11 42 59 27 160 -21 127 17 52 64 51 12 126 38 34 65 21 11 128 15 23 64 5 20 125 32 57 66 8 55 125 46 4 64 17 51 11 43 11 27 159 -21 126 5 18 64 3 19 125 26 21 64 32 29 127 2 30 63 18 37 124 21 30 65 18 53 124 36 7 63 30 41 11 43 23 28 157 -21 124 55 12 63 16 31 124 16 35 63 44 57 125 52 2 62 32 54 123 12 30 64 30 8 123 28 18 62 44 34 11 43 35 28 156 -21 123 47 13 62 30 44 123 8 57 62 58 30 124 43 42 61 48 8 122 5 38 63 42 32 122 22 23 61 59 25 11 43 48 29 155 -21 122 41 9 61 45 54 122 3 13 62 13 1 123 37 14 61 4 13 121 0 37 62 56 0 121 18 8 61 15 9 11 44 0 29 153 -21 121 36 44 61 1 55 120 59 9 61 28 27 122 32 26 60 21 8 119 57 14 62 10 28 120 15 21 60 31 43 11 44 12 30 152 -21 120 33 48 60 18 46 119 56 32 60 44 45 121 29 8 59 38 48 118 55 17 61 25 51 119 13 54 59 49 5 11 44 24 30 151 -20 119 32 12 59 36 23 118 55 14 60 1 50 120 27 9 58 57 11 117 54 36 60 42 5 118 13 36 59 7 9 11 44 36 31 150 -20 118 31 45 58 54 42 117 55 6 59 19 40 119 26 21 58 16 14 116 55 3 59 59 7 117 14 20 58 25 55 11 44 49 31 148 -20 117 32 22 58 13 42 116 55 59 58 38 12 118 26 36 57 35 54 115 56 30 59 16 54 116 16 0 57 45 20 11 45 1 31 147 -20 116 33 54 57 33 19 115 57 47 57 57 24 117 27 48 56 56 11 114 58 49 58 35 23 115 18 29 57 5 21 11 45 13 31 146 -19 115 36 16 56 53 32 115 0 24 57 17 12 116 29 51 56 17 1 114 1 55 57 54 31 114 21 42 56 25 56 11 45 25 32 145 -19 114 39 22 56 14 19 114 3 45 56 37 35 115 32 40 55 38 22 113 5 43 57 14 17 113 25 34 55 47 3 11 45 37 32 143 -19 113 43 7 55 35 37 113 7 43 55 58 32 114 36 9 55 0 14 112 10 6 56 34 37 112 29 59 55 8 41 11 45 49 32 142 -19 112 47 27 54 57 26 112 12 15 55 19 59 113 40 13 54 22 35 111 15 2 55 55 30 111 34 55 54 30 49 11 46 2 32 141 -18 111 52 17 54 19 43 111 17 17 54 41 56 112 44 49 53 45 22 110 20 24 55 16 55 110 40 17 53 53 23 11 46 14 32 140 -18 110 57 34 53 42 28 110 22 43 54 4 21 111 49 52 53 8 35 109 26 11 54 38 49 109 46 0 53 16 24 11 46 26 33 139 -18 110 3 13 53 5 38 109 28 32 53 27 13 110 55 20 52 32 13 108 32 17 54 1 11 108 52 3 52 39 50 11 46 38 33 137 -17 109 9 12 52 29 12 108 34 39 52 50 30 110 1 8 51 56 14 107 38 40 53 23 59 107 58 21 52 3 40 11 46 50 33 136 -17 108 15 26 51 53 10 107 41 1 52 14 11 109 7 14 51 20 38 106 45 17 52 47 13 107 4 52 51 27 52 11 47 3 33 135 -16 107 21 54 51 17 30 106 47 35 51 38 15 108 13 34 50 45 22 105 52 3 52 10 51 106 11 32 50 52 25 11 47 15 33 134 -16 106 28 32 50 42 11 105 54 19 51 2 40 107 20 5 50 10 27 104 58 57 51 34 51 105 18 19 50 17 19 11 47 27 33 133 -15 105 35 17 50 7 13 105 1 8 50 27 27 106 26 44 49 35 51 104 5 55 50 59 13 104 25 11 49 42 32 11 47 39 33 132 -15 104 42 6 49 32 33 104 8 1 49 52 33 105 33 30 49 1 33 103 12 55 50 23 56 103 32 3 49 8 4 11 47 51 33 130 -15 103 48 57 48 58 12 103 14 54 49 17 58 104 40 19 48 27 33 102 19 54 49 48 58 102 38 54 48 33 54 11 48 3 33 129 -14 102 55 48 48 24 8 102 21 46 48 43 40 103 47 8 47 53 50 101 26 49 49 14 20 101 45 41 48 0 0 11 48 16 33 128 -14 102 2 35 47 50 21 101 28 33 48 9 40 102 53 55 47 20 22 100 33 38 48 39 59 100 52 21 47 26 23 11 48 28 33 127 -13 101 9 15 47 16 50 100 35 13 47 35 56 102 0 38 46 47 10 99 40 17 48 5 54 99 58 52 46 53 0 11 48 40 33 126 -12 100 15 47 46 43 34 99 41 43 47 2 28 101 7 13 46 14 13 98 46 45 47 32 7 99 5 11 46 19 53 11 48 52 32 125 -12 99 22 8 46 10 32 98 48 1 46 29 15 100 13 39 45 41 29 97 52 58 46 58 34 98 11 15 45 46 59 11 49 4 32 124 -11 98 28 14 45 37 44 97 54 3 45 56 15 99 19 52 45 8 59 96 58 54 46 25 16 97 17 2 45 14 19 11 49 17 32 123 -11 97 34 4 45 5 10 96 59 47 45 23 29 98 25 51 44 36 41 96 4 30 45 52 12 96 22 29 44 41 51 11 49 29 32 121 -10 96 39 34 44 32 47 96 5 10 44 50 56 97 31 31 44 4 36 95 9 42 45 19 21 95 27 32 44 9 36 11 49 41 32 120 -9 95 44 41 44 0 37 95 10 9 44 18 35 96 36 51 43 32 41 94 14 27 44 46 43 94 32 9 43 37 31 11 49 53 31 119 -9 94 49 23 43 28 38 94 14 41 43 46 26 95 41 48 43 0 58 93 18 43 44 14 17 93 36 16 43 5 38 11 50 5 31 118 -8 93 53 35 42 56 49 93 18 42 43 14 27 94 46 17 42 29 25 92 22 26 43 42 2 92 39 49 42 33 54 11 50 17 31 117 -8 92 57 16 42 25 11 92 22 9 42 42 38 93 50 17 41 58 2 91 25 31 43 9 57 91 42 46 42 2 20 11 50 30 30 116 -7 92 0 20 41 53 42 91 24 59 42 10 59 92 53 43 41 26 48 90 27 56 42 38 2 90 45 2 41 30 55 11 50 42 30 115 -6 91 2 44 41 22 22 90 27 6 41 39 30 91 56 32 40 55 42 89 29 34 42 6 17 89 46 32 40 59 39 11 50 54 29 114 -5 90 4 24 40 51 10 89 28 26 41 8 8 90 58 40 40 24 45 88 30 23 41 34 40 88 47 12 40 28 30 11 51 6 29 113 -5 89 5 15 40 20 6 88 28 55 40 36 55 90 0 3 39 53 55 87 30 15 41 3 12 87 46 57 39 57 28 11 51 18 29 112 -4 88 5 12 39 49 9 87 28 28 40 5 48 89 0 35 39 23 12 86 29 7 40 31 50 86 45 41 39 26 33 11 51 30 28 111 -3 87 4 9 39 18 18 86 26 58 39 34 48 88 0 12 38 52 35 85 26 50 40 0 35 85 43 17 38 55 44 11 51 43 27 110 -2 86 2 0 38 47 33 85 24 19 39 3 54 86 58 48 38 22 5 84 23 19 39 29 26 84 39 39 38 24 59 11 51 55 27 109 -1 84 58 39 38 16 54 84 20 23 38 33 5 85 56 16 37 51 39 83 18 24 38 58 22 83 34 38 37 54 20 11 52 7 26 108 0 83 53 57 37 46 18 83 15 2 38 2 21 84 52 30 37 21 18 82 11 56 38 27 23 Uncertainty in time = +/- 8 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 0571-00600-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 42 12.6234 DE: +02 58 54.543 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 10.2 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1349) Bechuana approx. diameter [km]: 30 approx. diameter ["]: .019 distance from Earth [AU]: 2.16600 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 794 number of rejected observations: 48 time covered by the observations: 1934 Jun 13 - 2008 Sep 17 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.023, 58° remarks: * orbital elements for (1349) Bechuana : Mean anomaly = 82.91408213 deg Arg. of pericenter = 306.44218849 deg Long. of node = 307.21056128 deg Inclination = 10.06346942 deg Eccentricity = 0.15819014 Semimajor axis = 3.01058126 AU Perihelion dist = 2.53433700 AU Mag: H = 10.44, G = 0.15 Epoch of elements : MJD 54750.49100000 TDT (2008 Oct 11.491) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 11 1349 Bechuana 11h 47.4m UT 10.2 22 42 12.623 2 58 54.54TYC 0571-00600-1 10.8 15.0 30 4.2 2.166 -0.973 -7.80 143.2506 2.985 -0.20 -7.27 11.7908 -0.39470 0.73792 -3.59554 -1.92123 0.00344 0.00050 2000 82.82144020081011.00000306.442188307.210561 10.0634690.15819014 3.0105813 2.534337010.2 5.00.15 RATE 1.8868110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.030 66 2.56 0.030 0 54740.5020081011_0600-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org