IOTA/IOTA-ES occultation update for (3642) Frieden / TYC 6357-00904-1 event on 2012 Sep 16, 09:52 UT Visible from SE Australia Summary ------- On 2012 Sep 16 UT, the 36 km diameter asteroid (3642) Frieden will occult a 9.4 mag star in the constellation Capricornus for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.5 mag to 15.9 mag (the magnitude of the asteroid) for at most 5.5 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: 33 * date and approx. time of event: 2012 Sep 16, 09:35 - 2012 Sep 16, 10:04 UT * geocentric midpoint of event [JD]: 2456186.91111667 * magnitude of target star: 9.4 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 5.5 * Moon: 0 % sunlit, 133° distance * Sun: 138° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 2.04 * 1 sigma uncertainty interval [seconds]: +/- 11.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .043", 88° ) * approx speed of asteroid's shadow [km/s]: 6.5613 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6357-00904-1 by 3642 Frieden on 2012 Sep 16 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude -113 3 54 36 0 0 9 35 53 2 242 -41 -113 29 16 -112 38 20 -115 10 57 -110 51 55 -115 17 59 35 0 0 9 35 55 4 241 -43 -115 42 8 -114 53 40 -117 19 7 -113 12 46 Latitude Latitude Latitude Latitude -117 0 0 34 11 51 9 35 57 5 240 -45 34 23 8 34 0 35 35 9 10 33 14 36 -118 0 0 33 42 32 9 35 59 6 239 -46 33 53 52 33 31 12 34 40 8 32 44 58 -119 0 0 33 12 27 9 36 1 7 239 -47 33 23 50 33 1 3 34 10 21 32 14 35 -120 0 0 32 41 36 9 36 3 8 238 -48 32 53 3 32 30 9 33 39 48 31 43 26 -121 0 0 32 9 59 9 36 6 9 237 -49 32 21 30 31 58 28 33 8 30 31 11 31 -122 0 0 31 37 36 9 36 8 10 237 -49 31 49 11 31 26 2 32 36 26 30 38 50 -123 0 0 31 4 27 9 36 12 11 236 -50 31 16 5 30 52 49 32 3 35 30 5 23 -124 0 0 30 30 32 9 36 15 12 236 -51 30 42 14 30 18 51 31 29 59 29 31 10 -125 0 0 29 55 51 9 36 19 13 235 -52 30 7 37 29 44 6 30 55 36 28 56 11 -126 0 0 29 20 24 9 36 23 14 235 -53 29 32 13 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49 26 9 45 31 66 224 -69 - 4 36 34 - 5 2 17 - 3 44 4 - 5 54 43 -170 0 0 - 5 40 44 9 45 51 67 224 -68 - 5 27 54 - 5 53 34 - 4 35 30 - 6 45 54 -171 0 0 - 6 31 43 9 46 10 69 224 -67 - 6 18 55 - 6 44 32 - 5 26 38 - 7 36 46 -172 0 0 - 7 22 22 9 46 30 70 224 -66 - 7 9 36 - 7 35 9 - 6 17 26 - 8 27 16 -173 0 0 - 8 12 40 9 46 50 71 224 -64 - 7 59 55 - 8 25 24 - 7 7 52 - 9 17 24 -174 0 0 - 9 2 33 9 47 10 72 224 -63 - 8 49 50 - 9 15 16 - 7 57 55 -10 7 8 -175 0 0 - 9 52 2 9 47 29 74 224 -62 - 9 39 21 -10 4 43 - 8 47 34 -10 56 26 -176 0 0 -10 41 3 9 47 49 75 224 -61 -10 28 24 -10 53 42 - 9 36 47 -11 45 17 -177 0 0 -11 29 37 9 48 9 76 223 -60 -11 17 0 -11 42 14 -10 25 32 -12 33 40 -178 0 0 -12 17 42 9 48 29 77 223 -59 -12 5 7 -12 30 16 -11 13 48 -13 21 33 -179 0 0 -13 5 15 9 48 49 78 223 -58 -12 52 43 -13 17 47 -12 1 34 -14 8 55 -180 0 0 -13 52 17 9 49 8 79 222 -57 -13 39 48 -14 4 47 -12 48 49 -14 55 44 179 0 0 -14 38 47 9 49 28 81 222 -56 -14 26 19 -14 51 13 -13 35 31 -15 42 1 178 0 0 -15 24 42 9 49 48 82 221 -55 -15 12 17 -15 37 6 -14 21 39 -16 27 43 177 0 0 -16 10 2 9 50 7 83 220 -54 -15 57 40 -16 22 23 -15 7 13 -17 12 49 176 0 0 -16 54 46 9 50 27 84 218 -53 -16 42 27 -17 7 5 -15 52 11 -17 57 20 175 0 0 -17 38 53 9 50 46 85 215 -52 -17 26 37 -17 51 10 -16 36 33 -18 41 13 174 0 0 -18 22 23 9 51 5 86 211 -50 -18 10 10 -18 34 37 -17 20 17 -19 24 28 173 0 0 -19 5 15 9 51 24 87 203 -49 -18 53 5 -19 17 26 -18 3 24 -20 7 5 172 0 0 -19 47 28 9 51 43 88 185 -48 -19 35 20 -19 59 35 -18 45 52 -20 49 3 171 0 0 -20 29 1 9 52 2 88 146 -47 -20 16 57 -20 41 6 -19 27 40 -21 30 22 170 0 0 -21 9 55 9 52 20 88 103 -46 -20 57 53 -21 21 56 -20 8 49 -22 11 0 169 0 0 -21 50 8 9 52 39 87 83 -45 -21 38 9 -22 2 6 -20 49 17 -22 50 57 168 0 0 -22 29 40 9 52 57 86 74 -44 -22 17 44 -22 41 35 -21 29 5 -23 30 14 167 0 0 -23 8 30 9 53 15 85 70 -43 -22 56 38 -23 20 23 -22 8 12 -24 8 49 166 0 0 -23 46 40 9 53 33 84 67 -42 -23 34 50 -23 58 29 -22 46 37 -24 46 42 165 0 0 -24 24 7 9 53 51 83 65 -41 -24 12 21 -24 35 53 -23 24 20 -25 23 54 164 0 0 -25 0 53 9 54 8 82 64 -40 -24 49 10 -25 12 36 -24 1 22 -26 0 23 163 0 0 -25 36 56 9 54 26 81 63 -39 -25 25 16 -25 48 36 -24 37 41 -26 36 11 162 0 0 -26 12 17 9 54 43 80 63 -38 -26 0 41 -26 23 54 -25 13 18 -27 11 16 161 0 0 -26 46 56 9 55 0 79 62 -37 -26 35 23 -26 58 30 -25 48 13 -27 45 39 160 0 0 -27 20 53 9 55 16 78 62 -36 -27 9 23 -27 32 23 -26 22 26 -28 19 20 159 0 0 -27 54 7 9 55 33 77 62 -35 -27 42 40 -28 5 34 -26 55 56 -28 52 18 158 0 0 -28 26 39 9 55 49 76 62 -34 -28 15 15 -28 38 3 -27 28 44 -29 24 34 157 0 0 -28 58 29 9 56 5 75 62 -33 -28 47 9 -29 9 50 -28 0 50 -29 56 8 156 0 0 -29 29 37 9 56 21 74 62 -32 -29 18 20 -29 40 55 -28 32 14 -30 27 0 155 0 0 -30 0 3 9 56 37 73 63 -32 -29 48 49 -30 11 18 -29 2 56 -30 57 11 154 0 0 -30 29 48 9 56 52 73 63 -31 -30 18 36 -30 40 59 -29 32 56 -31 26 39 153 0 0 -30 58 50 9 57 7 72 63 -30 -30 47 42 -31 9 59 -30 2 14 -31 55 27 152 0 0 -31 27 12 9 57 22 71 63 -29 -31 16 6 -31 38 17 -30 30 51 -32 23 33 151 0 0 -31 54 52 9 57 37 70 64 -28 -31 43 50 -32 5 55 -30 58 46 -32 50 58 150 0 0 -32 21 52 9 57 51 69 64 -27 -32 10 52 -32 32 52 -31 26 1 -33 17 43 149 0 0 -32 48 11 9 58 6 68 65 -26 -32 37 14 -32 59 8 -31 52 35 -33 43 47 148 0 0 -33 13 50 9 58 20 67 65 -25 -33 2 56 -33 24 43 -32 18 28 -34 9 11 147 0 0 -33 38 48 9 58 33 66 65 -24 -33 27 58 -33 49 39 -32 43 42 -34 33 55 146 0 0 -34 3 8 9 58 47 65 66 -24 -33 52 19 -34 13 56 -33 8 15 -34 58 0 145 0 0 -34 26 47 9 59 1 64 66 -23 -34 16 2 -34 37 33 -33 32 9 -35 21 26 144 0 0 -34 49 48 9 59 14 64 67 -22 -34 39 5 -35 0 31 -33 55 23 -35 44 13 143 0 0 -35 12 10 9 59 27 63 67 -21 -35 1 30 -35 22 50 -34 17 59 -36 6 21 142 0 0 -35 33 54 9 59 40 62 68 -20 -35 23 16 -35 44 31 -34 39 56 -36 27 51 141 0 0 -35 54 59 9 59 52 61 68 -19 -35 44 25 -36 5 34 -35 1 15 -36 48 44 140 0 0 -36 15 27 10 0 5 60 69 -19 -36 4 55 -36 26 0 -35 21 55 -37 8 59 139 0 0 -36 35 18 10 0 17 59 69 -18 -36 24 48 -36 45 48 -35 41 58 -37 28 37 138 0 0 -36 54 32 10 0 29 58 70 -17 -36 44 4 -37 4 59 -36 1 24 -37 47 38 137 0 0 -37 13 8 10 0 41 58 70 -16 -37 2 44 -37 23 33 -36 20 13 -38 6 3 136 0 0 -37 31 9 10 0 52 57 71 -15 -37 20 46 -37 41 32 -36 38 26 -38 23 52 135 0 0 -37 48 34 10 1 4 56 71 -15 -37 38 13 -37 58 54 -36 56 2 -38 41 5 134 0 0 -38 5 23 10 1 15 55 72 -14 -37 55 4 -38 15 41 -37 13 2 -38 57 43 133 0 0 -38 21 36 10 1 26 54 72 -13 -38 11 20 -38 31 52 -37 29 26 -39 13 46 132 0 0 -38 37 15 10 1 37 54 73 -12 -38 27 1 -38 47 29 -37 45 15 -39 29 14 131 0 0 -38 52 19 10 1 48 53 73 -11 -38 42 7 -39 2 31 -38 0 29 -39 44 8 130 0 0 -39 6 49 10 1 58 52 74 -11 -38 56 38 -39 16 59 -38 15 9 -39 58 28 129 0 0 -39 20 44 10 2 9 51 75 -10 -39 10 36 -39 30 52 -38 29 14 -40 12 13 128 0 0 -39 34 6 10 2 19 51 75 -9 -39 23 59 -39 44 12 -38 42 45 -40 25 26 127 0 0 -39 46 54 10 2 29 50 76 -8 -39 36 49 -39 56 59 -38 55 42 -40 38 5 126 0 0 -39 59 9 10 2 39 49 76 -8 -39 49 6 -40 9 12 -39 8 5 -40 50 12 125 0 0 -40 10 51 10 2 48 48 77 -7 -40 0 49 -40 20 52 -39 19 56 -41 1 45 124 0 0 -40 22 0 10 2 58 48 78 -6 -40 12 0 -40 32 0 -39 31 13 -41 12 47 123 0 0 -40 32 37 10 3 7 47 78 -5 -40 22 39 -40 42 35 -39 41 57 -41 23 16 122 0 0 -40 42 41 10 3 17 46 79 -5 -40 32 45 -40 52 38 -39 52 9 -41 33 13 121 0 0 -40 52 14 10 3 26 45 79 -4 -40 42 18 -41 2 9 -40 1 48 -41 42 39 120 0 0 -41 1 15 10 3 34 45 80 -3 -40 51 20 -41 11 9 -40 10 55 -41 51 33 119 0 0 -41 9 44 10 3 43 44 81 -3 -40 59 51 -41 19 37 -40 19 31 -41 59 56 118 0 0 -41 17 41 10 3 52 43 81 -2 -41 7 50 -41 27 33 -40 27 34 -42 7 48 117 0 0 -41 25 8 10 4 0 42 82 -1 -41 15 17 -41 34 59 -40 35 6 -42 15 9 116 0 0 -41 32 3 10 4 9 42 82 0 -41 22 13 -41 41 53 -40 42 6 -42 21 59 Uncertainty in time = +/- 13 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 6357-00904-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 01 15.6836 DE: -21 26 57.793 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 9.4 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3642) Frieden approx. diameter [km]: 36 approx. diameter ["]: .023 distance from Earth [AU]: 2.19400 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 793 number of rejected observations: 13 time covered by the observations: 1936 Mar 27 - 2012 Sep 01 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.035, 88° remarks: * orbital elements for (3642) Frieden : Mean anomaly = 177.33782323 deg Arg. of pericenter = 15.85161670 deg Long. of node = 131.31440647 deg Inclination = 13.47196576 deg Eccentricity = 0.08200032 Semimajor axis = 2.78611606 AU Perihelion dist = 2.55765366 AU Mag: H = 11.06, G = 0.15 Epoch of elements : MJD 56186.41100000 TDT (2012 Sep 16.411) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 16 3642 Frieden 9h 52.0m UT 9.4 21 1 15.684-21 26 57.79TYC 6357-00904-1 10.0 15.9 36 5.5 2.194 -0.830 -9.25 171.5615 -21.447 30.68 2.41 9.8668 -0.01118 0.01891 -2.89400 -2.31079 0.00363 0.00141 2000 175.9791002012 910.00000 15.851617131.314406 13.4719660.08200032 2.7861161 2.557653711.0 5.00.15 RATE 2.1193620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.043 88 3.04 0.046 0 0-4-3 056178.0020120916_0904-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org