IOTA/IOTA-ES occultation update for (402) Chloe / 2UCAC 34598176 event on 2012 Nov 07, 07:48 UT Visible from Canada Summary ------- On 2012 Nov 07 UT, the 61 km diameter asteroid (402) Chloe will occult a 12.4 mag star in the constellation Orion for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.9 mag (the magnitude of the asteroid) for at most 14.0 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: 74 * date and approx. time of event: 2012 Nov 07, 07:34 - 2012 Nov 07, 08:02 UT * geocentric midpoint of event [JD]: 2456238.82545 * magnitude of target star: 12.4 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 14.0 * Moon: 47 % sunlit, 52° distance * Sun: 136° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 11.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .039", 86° ) * approx speed of asteroid's shadow [km/s]: 4.3216 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 34598176 by 402 Chloe on 2012 Nov 7 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 51 16 29 81 59 43 7 34 53 4 305 -8 32 30 44 83 2 18 ... .. .. .. .. .. 10 25 51 83 4 47 ... .. .. .. .. .. 17 28 14 84 10 9 7 35 14 8 272 -12 3 18 8 83 53 10 35 16 23 83 58 7 - 11 55 5 83 0 51 ... .. .. .. .. .. - 10 43 51 84 16 36 7 35 36 11 244 -15 - 19 31 21 83 33 21 1 46 50 84 51 49 - 28 28 14 82 21 46 30 23 46 85 4 15 - 30 59 40 83 34 5 7 35 57 13 224 -17 - 35 37 27 82 43 20 - 24 21 45 84 24 51 - 40 27 34 81 27 22 - 6 56 3 85 35 49 - 44 38 2 82 32 43 7 36 18 15 210 -18 - 46 53 12 81 41 40 - 41 32 8 83 25 49 - 49 20 20 80 26 55 - 33 44 4 84 51 3 - 54 6 20 81 25 24 7 36 39 16 201 -20 - 55 4 37 80 36 21 - 52 48 41 82 16 43 - 56 9 35 79 24 38 - 49 45 37 83 40 46 - 61 3 21 80 17 13 7 37 0 18 194 -21 - 61 19 13 79 30 41 - 60 41 33 81 5 45 - 61 35 40 78 22 24 - 59 49 55 82 25 3 - 66 25 35 79 10 3 7 37 21 19 188 -23 - 66 17 5 78 26 1 - 66 33 58 79 55 47 - 66 3 53 77 21 6 - 66 46 16 81 10 1 - 70 45 24 78 4 38 7 37 43 20 184 -24 - 70 22 22 77 22 54 - 71 10 48 78 47 47 - 69 50 32 76 21 5 - 71 56 6 79 57 23 - 74 22 7 77 1 10 7 38 4 21 180 -25 - 73 50 12 76 21 30 - 74 57 26 77 42 1 - 73 6 23 75 22 30 - 76 0 28 78 47 32 - 77 27 51 75 59 38 7 38 25 22 177 -27 - 76 50 25 75 21 49 - 78 9 4 76 38 28 - 75 58 47 74 25 21 - 79 21 47 77 40 25 - 80 10 34 74 59 58 7 38 46 23 174 -28 - 79 29 41 74 23 47 - 80 55 15 75 36 59 - 78 32 54 73 29 37 - 82 13 11 76 35 49 - 82 35 39 74 2 1 7 39 7 24 171 -29 - 81 52 38 73 27 19 - 83 22 20 74 37 26 - 80 52 30 72 35 14 - 84 42 55 75 33 33 - 84 46 55 73 5 41 7 39 28 25 169 -30 - 84 2 39 72 32 19 - 85 34 41 73 39 40 - 83 0 21 71 42 7 - 86 56 21 74 33 21 - 86 47 8 72 10 50 7 39 50 26 167 -31 - 86 2 11 71 38 41 - 87 35 23 72 43 32 - 84 58 33 70 50 11 - 88 57 13 73 35 3 - 88 38 22 71 17 21 7 40 11 26 165 -32 - 87 53 7 70 46 18 - 89 26 43 71 48 54 - 86 48 43 69 59 22 - 90 48 9 72 38 28 - 90 22 11 70 25 8 7 40 32 27 163 -33 - 89 36 53 69 55 5 - 91 10 22 70 55 37 - 88 32 7 69 9 36 - 92 31 3 71 43 27 - 91 59 47 69 34 5 7 40 53 28 161 -34 - 91 14 37 69 4 57 - 92 47 39 70 3 36 - 90 9 47 68 20 48 - 94 7 22 70 49 50 - 93 32 8 68 44 7 7 41 14 28 159 -35 - 92 47 14 68 15 50 - 94 19 35 69 12 45 - 91 42 31 67 32 55 - 95 38 14 69 57 32 - 95 0 1 67 55 10 7 41 35 29 157 -36 - 94 15 26 67 27 40 - 95 46 58 68 22 58 - 93 10 59 66 45 53 - 97 4 29 69 6 24 - 96 24 2 67 7 8 7 41 57 29 156 -37 - 95 39 51 66 40 22 - 97 10 28 67 34 11 - 94 35 45 65 59 38 - 98 26 50 68 16 23 - 97 44 44 66 19 59 7 42 18 30 154 -38 - 97 0 57 65 53 53 - 98 30 37 66 46 19 - 95 57 17 65 14 9 - 99 45 51 67 27 23 - 99 2 30 65 33 37 7 42 39 30 153 -39 - 98 19 9 65 8 9 - 99 47 51 65 59 19 - 97 15 58 64 29 22 -101 1 58 66 39 19 -100 17 44 64 48 2 7 43 0 31 151 -40 - 99 34 49 64 23 9 -101 2 32 65 13 6 - 98 32 7 63 45 14 -102 15 34 65 52 6 -101 30 43 64 3 8 7 43 21 31 150 -41 -100 48 14 63 38 49 -102 14 59 64 27 38 - 99 46 3 63 1 43 -103 26 59 65 5 43 -102 41 43 63 18 55 7 43 42 32 148 -42 -101 59 40 62 55 7 -103 25 29 63 42 52 -100 58 0 62 18 48 -104 36 29 64 20 5 -103 50 58 62 35 19 7 44 4 32 147 -42 -103 9 21 62 12 1 -104 34 14 62 58 45 -102 8 10 61 36 25 -105 44 17 63 35 9 -104 58 40 61 52 17 7 44 25 32 145 -43 -104 17 26 61 29 28 -105 41 27 62 15 15 -103 16 46 60 54 34 -106 50 36 62 50 52 -106 4 58 61 9 49 7 44 46 33 144 -44 -105 24 8 60 47 26 -106 47 18 61 32 19 -104 23 57 60 13 12 -107 55 36 62 7 12 -107 10 3 60 27 51 7 45 7 33 142 -45 -106 29 35 60 5 54 -107 51 57 60 49 55 -105 29 53 59 32 18 -108 59 27 61 24 7 -108 14 2 59 46 23 7 45 28 33 141 -46 -107 33 56 59 24 50 -108 55 31 60 8 2 -106 34 40 58 51 49 -110 2 16 60 41 34 -109 17 3 59 5 22 7 45 50 33 140 -47 -108 37 17 58 44 12 -109 58 8 59 26 38 -107 38 27 58 11 46 -111 4 11 59 59 32 -110 19 12 58 24 47 7 46 11 34 138 -47 -109 39 45 58 3 59 -110 59 56 58 45 40 -108 41 20 57 32 6 -112 5 19 59 17 59 -111 20 35 57 44 37 7 46 32 34 137 -48 -110 41 26 57 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58 51 57 52 7 49 42 34 125 -54 -119 34 39 51 40 4 -120 50 17 52 15 42 -118 39 0 51 12 40 -121 51 19 52 43 9 -121 9 53 51 20 40 7 50 4 34 124 -55 -120 32 40 51 3 6 -121 48 4 51 38 14 -119 37 9 50 36 5 -122 48 53 52 5 17 -122 7 47 50 43 39 7 50 25 34 123 -56 -121 30 39 50 26 20 -122 45 52 51 0 58 -120 35 15 49 59 42 -123 46 31 51 27 38 -123 5 43 50 6 50 7 50 46 34 122 -56 -122 28 39 49 49 46 -123 43 44 50 23 54 -121 33 20 49 23 28 -124 44 14 50 50 11 -124 3 46 49 30 11 7 51 7 34 121 -57 -123 26 44 49 13 21 -124 41 44 49 47 1 -122 31 28 48 47 24 -125 42 8 50 12 56 -125 1 57 48 53 42 7 51 28 33 119 -57 -124 24 57 48 37 5 -125 39 53 49 10 18 -123 29 41 48 11 30 -126 40 14 49 35 50 -126 0 21 48 17 22 7 51 49 33 118 -58 -125 23 20 48 0 58 -126 38 17 48 33 44 -124 28 4 47 35 43 -127 38 36 48 58 54 -126 59 0 47 41 9 7 52 11 33 117 -59 -126 21 58 47 24 59 -127 36 57 47 57 18 -125 26 38 47 0 4 -128 37 19 48 22 7 -127 57 59 47 5 3 7 52 32 33 116 -59 -127 20 53 46 49 7 -128 35 59 47 20 59 -126 25 29 46 24 31 -129 36 24 47 45 26 -128 57 20 46 29 4 7 52 53 32 115 -59 -128 20 10 46 13 20 -129 35 25 46 44 46 -127 24 38 45 49 4 -130 35 58 47 8 53 -129 57 7 45 53 10 7 53 14 32 113 -60 -129 19 51 45 37 39 -130 35 19 46 8 39 -128 24 9 45 13 42 -131 36 2 46 32 25 -130 57 26 45 17 20 7 53 35 32 112 -60 -130 20 1 45 2 2 -131 35 46 45 32 36 -129 24 7 44 38 23 -132 36 42 45 56 1 -131 58 18 44 41 33 7 53 56 31 111 -61 -131 20 44 44 26 28 -132 36 49 44 56 36 -130 24 35 44 3 9 -133 38 3 45 19 41 -132 59 50 44 5 49 7 54 18 31 110 -61 -132 22 3 43 50 56 -133 38 33 44 20 39 -131 25 37 43 27 56 -134 40 8 44 43 23 -134 2 6 43 30 7 7 54 39 30 109 -61 -133 24 4 43 15 27 -134 41 4 43 44 43 -132 27 17 42 52 46 -135 43 4 44 7 7 -135 5 11 42 54 24 7 55 0 30 108 -62 -134 26 52 42 39 57 -135 44 27 43 8 48 -133 29 40 42 17 35 -136 46 57 43 30 50 -136 9 10 42 18 41 7 55 21 29 107 -62 -135 30 33 42 4 27 -136 48 48 42 32 52 -134 32 52 41 42 24 -137 51 52 42 54 33 -137 14 12 41 42 56 7 55 42 29 106 -62 -136 35 11 41 28 55 -137 54 13 41 56 53 -135 36 58 41 7 12 -138 57 57 42 18 12 -138 20 21 41 7 8 7 56 3 28 105 -62 -137 40 54 40 53 20 -139 0 50 41 20 51 -136 42 5 40 31 57 -140 5 21 41 41 48 -139 27 47 40 31 15 7 56 25 28 103 -62 -138 47 50 40 17 41 -140 8 47 40 44 44 -137 48 18 39 56 38 -141 14 12 41 5 18 -140 36 37 39 55 16 7 56 46 27 102 -62 -139 56 7 39 41 56 -141 18 15 40 8 30 -138 55 46 39 21 14 -142 24 41 40 28 40 -141 47 4 39 19 8 7 57 7 26 101 -62 -141 5 54 39 6 3 -142 29 23 39 32 7 -140 4 38 38 45 42 -143 37 1 39 51 53 -142 59 18 38 42 51 7 57 28 26 100 -62 -142 17 23 38 30 1 -143 42 26 38 55 34 -141 15 4 38 10 3 -144 51 27 39 14 53 -144 13 33 38 6 21 7 57 49 25 99 -62 -143 30 47 37 53 47 -144 57 38 38 18 47 -142 27 14 37 34 12 -146 8 14 38 37 38 -145 30 7 37 29 36 7 58 11 24 98 -61 -144 46 20 37 17 19 -146 15 16 37 41 43 -143 41 24 36 58 9 -147 27 46 38 0 5 -146 49 19 36 52 32 7 58 32 23 97 -61 -146 4 22 36 40 34 -147 35 45 37 4 20 -144 57 49 36 21 50 -148 50 27 37 22 9 -148 11 33 36 15 6 7 58 53 22 96 -61 -147 25 14 36 3 28 -148 59 30 36 26 32 -146 16 48 35 45 13 -150 16 51 36 43 45 -149 37 21 35 37 13 7 59 14 21 95 -60 -148 49 24 35 25 57 -150 27 6 35 48 15 -147 38 45 35 8 14 -151 47 39 36 4 47 -151 7 22 34 58 46 7 59 35 20 94 -59 -150 17 28 34 47 56 -151 59 19 35 9 22 -149 4 9 34 30 47 -153 23 48 35 25 6 -152 42 28 34 19 39 7 59 56 19 93 -59 -151 50 9 34 9 17 -153 37 8 34 29 42 -150 33 38 33 52 49 -155 6 35 34 44 30 -154 23 51 33 39 39 8 0 18 17 92 -58 -153 28 30 33 29 52 -155 21 58 33 49 5 -152 8 1 33 14 10 -156 57 54 34 2 43 -156 13 11 32 58 32 8 0 39 16 90 -57 -155 13 56 32 49 27 -157 15 54 33 7 10 -153 48 24 32 34 40 -159 0 42 33 19 18 -158 13 7 32 15 55 8 1 0 14 89 -55 -157 8 33 32 7 43 -159 22 14 32 23 28 -155 36 22 31 54 7 -161 20 5 32 33 29 -160 27 57 31 31 8 8 1 21 13 88 -54 -159 15 41 31 24 12 -161 46 49 31 37 7 -157 34 18 31 12 8 -164 6 24 31 43 45 -163 6 6 30 42 57 8 1 42 10 87 -52 -161 41 19 30 37 59 -164 42 17 30 46 17 -159 46 3 30 28 8 -167 49 20 30 45 44 -166 28 44 29 48 16 8 2 3 7 85 -49 -164 38 21 29 47 10 -168 49 57 29 44 52 -162 18 49 29 41 4 ... .. .. .. .. .. -172 57 7 28 26 25 8 2 25 2 82 -44 -168 49 42 28 45 29 ... .. .. .. .. .. -165 29 25 28 48 28 ... .. .. .. .. .. Uncertainty in time = +/- 11 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: 2UCAC 34598176 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 47 27.2356 DE: +08 13 13.670 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .034, .038 ) * V mag [mag]: 12.4 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (402) Chloe approx. diameter [km]: 61 approx. diameter ["]: .051 distance from Earth [AU]: 1.65100 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 989 number of rejected observations: 84 time covered by the observations: 1903 Feb 22 - 2012 Oct 14 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.011, 78° remarks: * orbital elements for (402) Chloe : Mean anomaly = 296.03978078 deg Arg. of pericenter = 17.13994903 deg Long. of node = 129.44303935 deg Inclination = 11.82056366 deg Eccentricity = 0.11159675 Semimajor axis = 2.56043869 AU Perihelion dist = 2.27470207 AU Mag: H = 8.93, G = 0.15 Epoch of elements : MJD 56238.32500000 TDT (2012 Nov 07.325) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 7 402 Chloe 7h 48.6m UT 12.4 5 47 27.236 8 13 13.672UCAC 34598176 0.0 12.9 61 14.0 1.651 -0.779 -5.97 -77.2188 8.223 58.77 -16.43 7.8108 -0.38206 0.73100 -2.16644 -1.12089 -0.00386 0.00103 2000 294.03707720121030.00000 17.139949129.443039 11.8205640.11159675 2.5604387 2.2747021 9.0 5.00.15 RATE 2.4056500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.039 86 1.77 0.039 0 0-4 0 056226.0020121107_598176 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org