IOTA/IOTA-ES occultation update for (43) Ariadne / HIP 26599 event on 2012 Dec 16, 19:28 UT Visible from Arctic Summary ------- On 2012 Dec 16 UT, the 66 km diameter asteroid (43) Ariadne will occult a 7.6 mag star in the constellation Taurus for observers along a path across Arctic. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 11.0 mag (the magnitude of the asteroid) for at most 5.1 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: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2012 Dec 16, 19:24 - 2012 Dec 16, 19:32 UT * geocentric midpoint of event [JD]: 2456278.31124167 * magnitude of target star: 7.6 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 5.1 * Moon: 17 % sunlit, 132° distance * Sun: 180° distance * rough path description: Arctic Additional comments ------------------- wide double star The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .021 +/- .016) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .016", 90° ) * approx speed of asteroid's shadow [km/s]: 13.2790 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 26599 by 43 Ariadne on 2012 Dec 16 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 -169 17 59 61 19 30 19 24 8 6 309 -6 -172 57 24 62 26 34 -164 15 26 59 21 11 -174 38 32 62 53 5 ... .. .. .. .. .. -173 21 50 63 33 40 19 24 15 9 305 -9 -176 26 52 64 17 14 -169 54 11 62 34 46 -177 57 10 64 35 47 -167 50 42 61 53 56 -176 36 32 65 17 5 19 24 21 11 302 -11 -179 27 36 65 49 3 -173 33 23 64 36 18 179 7 10 66 2 58 -171 51 35 64 10 22 -179 28 45 66 45 2 19 24 28 13 299 -13 177 46 58 67 9 35 -176 36 20 66 14 15 176 24 17 67 20 19 -175 2 43 65 55 12 177 51 32 68 3 11 19 24 34 14 297 -14 175 10 27 68 22 22 -179 21 8 67 39 8 173 48 56 68 30 41 -177 51 18 67 24 20 175 19 7 69 14 23 19 24 40 16 294 -16 172 39 7 69 29 20 178 4 24 68 55 21 171 17 54 69 35 41 179 32 37 68 43 36 172 50 46 70 20 16 19 24 47 17 292 -17 170 10 26 70 31 44 175 35 56 70 5 15 168 48 55 70 36 25 177 3 46 69 55 52 170 24 14 71 21 54 19 24 53 18 289 -18 167 42 31 71 30 20 173 10 36 71 10 16 166 20 16 71 33 34 174 38 55 71 2 48 167 57 45 72 20 0 19 25 0 19 287 -19 165 13 52 72 25 44 170 46 19 72 11 19 163 50 33 72 27 39 172 15 45 72 5 31 165 29 49 73 15 4 19 25 6 20 284 -20 162 43 8 73 18 20 168 21 24 73 9 2 161 18 28 73 19 1 169 52 28 73 4 42 162 59 6 74 7 27 19 25 12 21 282 -21 160 9 6 74 8 24 165 54 23 74 3 52 158 42 54 74 7 57 167 27 29 74 0 53 160 24 19 74 57 25 19 25 19 22 279 -22 157 30 36 74 56 11 163 23 52 74 56 10 156 2 41 74 54 37 164 59 23 74 54 25 157 44 12 75 45 11 19 25 25 23 276 -22 154 46 27 75 41 48 160 48 29 75 46 8 153 16 43 75 39 9 162 26 44 75 45 36 154 57 24 76 30 50 19 25 32 23 273 -23 151 55 25 76 25 21 158 6 49 76 33 59 150 23 51 76 21 39 159 48 4 76 34 36 152 2 33 77 14 29 19 25 38 24 270 -24 148 56 16 77 6 55 155 17 22 77 19 47 147 22 53 77 2 10 157 1 52 77 21 33 148 58 11 77 56 9 19 25 44 25 267 -25 145 47 40 77 46 29 152 18 32 78 3 36 144 12 35 77 40 40 154 6 26 78 6 31 145 42 40 78 35 49 19 25 51 25 263 -25 142 28 15 78 24 3 149 8 30 78 45 28 140 51 42 78 17 10 150 59 54 78 49 32 142 14 21 79 13 28 19 25 57 26 259 -26 138 56 35 78 59 32 145 45 19 79 25 20 137 18 56 78 51 35 147 40 11 79 30 36 138 31 24 79 48 59 19 26 3 26 255 -26 135 11 14 79 32 52 142 6 51 80 3 9 133 33 3 79 23 49 144 4 57 80 9 38 134 32 1 80 22 16 19 26 10 27 251 -27 131 10 49 80 3 55 138 10 47 80 38 47 129 32 51 79 53 46 140 11 40 80 46 32 130 14 25 80 53 8 19 26 16 27 247 -27 126 54 6 80 32 32 133 54 43 81 12 3 125 17 20 80 21 16 135 57 34 81 21 7 125 37 0 81 21 23 19 26 23 28 242 -28 122 20 6 80 58 30 129 16 16 81 42 46 120 45 49 80 46 8 131 19 50 81 53 11 120 38 34 81 46 45 19 26 29 28 236 -28 117 28 18 81 21 38 124 13 22 82 10 37 115 58 2 81 8 11 126 15 47 82 22 25 115 18 37 82 9 0 19 26 35 28 231 -28 112 18 51 81 41 41 118 44 29 82 35 19 110 54 23 81 27 12 120 43 17 82 48 30 109 37 38 82 27 48 19 26 42 29 225 -29 106 52 45 81 58 26 112 49 12 82 56 30 105 35 59 81 42 59 114 41 11 83 11 3 103 37 27 82 42 54 19 26 48 29 218 -29 101 12 1 82 11 39 106 28 45 83 13 47 100 4 55 81 55 20 108 10 8 83 29 37 97 21 24 82 54 1 19 26 55 29 212 -29 95 19 49 82 21 10 99 46 22 83 26 50 94 24 8 82 4 7 101 13 10 83 43 49 90 54 22 83 0 59 19 27 1 30 205 -30 89 20 15 82 26 51 92 47 42 83 35 21 88 37 25 82 9 14 93 56 12 83 53 16 84 22 26 83 3 41 19 27 7 30 198 -30 83 18 11 82 28 40 85 40 23 83 39 10 82 49 4 82 10 38 86 27 48 83 57 47 77 52 18 83 2 9 19 27 14 30 191 -30 77 18 44 82 26 38 78 33 17 83 38 15 77 3 35 82 8 23 78 58 20 83 57 16 71 30 30 82 56 30 19 27 20 30 184 -30 71 26 49 82 20 53 71 35 18 83 32 45 71 25 16 82 2 36 71 38 22 83 51 51 65 22 41 82 46 58 19 27 27 30 178 -30 65 46 43 82 11 37 64 54 11 83 22 55 65 57 47 81 53 28 64 37 7 83 41 51 59 33 8 82 33 51 19 27 33 31 172 -31 60 21 40 81 59 5 58 35 37 83 9 8 60 44 3 81 41 13 58 1 15 83 27 40 54 4 32 82 17 31 19 27 39 31 166 -31 55 13 54 81 43 35 52 42 59 82 51 50 55 46 2 81 26 6 51 54 37 83 9 48 48 58 11 81 58 19 19 27 46 31 160 -31 50 24 35 81 25 24 47 17 35 82 31 27 51 4 50 81 8 24 46 18 28 82 48 45 44 14 9 81 36 37 19 27 52 31 155 -31 45 53 57 81 4 51 42 19 7 82 8 27 46 40 47 80 48 23 41 12 8 82 25 0 39 51 37 81 12 44 19 27 58 31 150 -31 41 41 38 80 42 11 37 46 8 81 43 11 42 33 37 80 26 18 36 33 43 81 58 57 35 49 17 80 46 57 19 28 5 31 146 -31 37 46 46 80 17 41 33 36 36 81 16 1 38 42 39 80 2 24 32 20 42 81 31 0 32 5 30 80 19 33 19 28 11 31 142 -31 34 8 12 79 51 34 29 48 14 80 47 13 35 6 56 79 36 55 28 30 21 81 1 25 28 38 33 79 50 45 19 28 18 31 138 -31 30 44 38 79 24 1 26 18 44 80 17 2 31 45 22 79 10 0 24 59 57 80 30 28 25 26 42 79 20 43 19 28 24 31 134 -31 27 34 45 78 55 14 23 5 51 79 45 39 28 36 45 78 41 49 21 47 1 79 58 22 22 28 19 78 49 36 19 28 30 31 131 -31 24 37 13 78 25 21 20 7 34 79 13 15 25 39 57 78 12 32 18 49 15 79 25 16 19 41 54 78 17 33 19 28 37 31 128 -31 21 50 47 77 54 29 17 22 4 78 39 57 22 53 49 77 42 15 16 4 41 78 51 18 17 6 4 77 44 39 19 28 43 31 125 -31 19 14 19 77 22 44 14 47 44 78 5 52 20 17 18 77 11 5 13 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- 14 41 57 65 20 28 - 18 5 37 65 27 31 - 13 51 7 65 17 52 - 19 0 46 65 28 30 - 17 50 26 64 38 47 19 30 51 23 84 -23 - 16 10 44 64 35 41 - 19 33 23 64 40 36 - 15 20 8 64 33 36 - 20 28 16 64 41 0 - 19 19 18 63 51 52 19 30 57 23 83 -23 - 17 39 53 63 49 52 - 21 1 58 63 52 32 - 16 49 27 63 48 19 - 21 56 43 63 52 18 - 20 49 6 63 3 45 19 31 4 22 81 -22 - 19 9 46 63 2 54 - 22 31 46 63 3 10 - 18 19 22 63 1 57 - 23 26 31 63 2 15 - 22 20 17 62 14 15 19 31 10 21 80 -21 - 20 40 45 62 14 40 - 24 3 14 62 12 18 - 19 50 17 62 14 20 - 24 58 11 62 10 37 - 23 53 17 61 23 11 19 31 17 20 78 -20 - 22 13 15 61 25 0 - 25 36 53 61 19 43 - 21 22 34 61 25 20 - 26 32 15 61 17 12 - 25 28 42 60 30 18 19 31 23 19 76 -19 - 23 47 47 60 33 39 - 27 13 24 60 25 8 - 22 56 43 60 34 45 - 28 9 27 60 21 38 - 27 7 13 59 35 17 19 31 29 18 75 -18 - 25 24 58 59 40 24 - 28 53 36 59 28 8 - 24 33 17 59 42 20 - 29 50 42 59 23 31 - 28 49 46 58 37 42 19 31 36 17 73 -17 - 27 5 33 58 44 51 - 30 38 36 58 28 13 - 26 13 0 58 47 45 - 31 37 12 58 22 15 - 30 37 34 57 36 58 19 31 42 16 71 -16 - 28 50 33 57 46 33 - 32 29 55 57 24 38 - 27 56 47 57 50 35 - 33 30 45 57 16 58 - 32 32 22 56 32 15 19 31 49 15 70 -15 - 30 41 21 56 44 51 - 34 29 51 56 16 17 - 29 45 50 56 50 16 - 35 33 58 56 6 23 - 34 36 48 55 22 15 19 31 55 13 68 -13 - 32 39 57 55 38 46 - 36 42 4 55 1 20 - 31 41 57 55 45 55 - 37 51 21 54 48 17 - 36 55 18 54 4 47 19 32 1 11 66 -11 - 34 49 29 54 26 47 - 39 13 20 53 36 28 - 33 47 46 54 36 17 - 40 31 40 53 18 19 - 39 36 33 52 35 37 19 32 8 9 64 -9 - 37 15 25 53 6 12 - 42 19 15 51 53 59 - 36 7 48 53 19 9 - 43 58 0 51 25 6 - 43 3 1 50 43 43 19 32 14 7 61 -7 - 40 9 20 51 31 24 - 47 3 53 49 22 24 - 38 50 48 51 50 14 ... .. .. .. .. .. Uncertainty in time = +/- 2 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 26599 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 39 14.8248 DE: +23 19 24.022 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .017, .013 ) * V mag [mag]: 7.6 * B mag [mag]: 9.4 * Diameter [mas]: 2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (43) Ariadne approx. diameter [km]: 66 approx. diameter ["]: .058 distance from Earth [AU]: 1.57000 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1274 number of rejected observations: 158 time covered by the observations: 1904 Nov 17 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 91° remarks: * orbital elements for (43) Ariadne : Mean anomaly = 158.06965010 deg Arg. of pericenter = 16.24202769 deg Long. of node = 264.87180088 deg Inclination = 3.46987197 deg Eccentricity = 0.16780091 Semimajor axis = 2.20439896 AU Perihelion dist = 1.83449881 AU Mag: H = 7.80, G = 0.11 Epoch of elements : MJD 56277.81100000 TDT (2012 Dec 16.811) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 16 43 Ariadne 19h 28.2m UT 7.6 5 39 14.825 23 19 24.02HIP 26599 9.4 11.0 68 5.1 1.570 -3.027 -4.77 66.9253 23.326 -113.04 -23.35 19.4698 -0.09680 0.84741 -7.44656 -0.85105 0.00001 0.00000 2000 155.717444201212 9.00000 16.242028264.871801 3.4698720.16780091 2.2043990 1.8344988 7.9 5.00.11 RATE 3.0114020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.021 0.016 90 1.26 0.016 0 2-2 2 456264.0020121216__26599 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org