IOTA/IOTA-ES occultation update for (304) Olga / TYC 0089-01141-1 event on 2012 Sep 25, 15:48 UT Visible from Japan, China Summary ------- On 2012 Sep 25 UT, the 71 km diameter asteroid (304) Olga will occult a 9.3 mag star in the constellation Orion for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 13.8 mag (the magnitude of the asteroid) for at most 6.9 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: 92 * date and approx. time of event: 2012 Sep 25, 15:47 - 2012 Sep 25, 16:03 UT * geocentric midpoint of event [JD]: 2456196.16457917 * magnitude of target star: 9.3 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 6.9 * Moon: 79 % sunlit, 124° distance * Sun: 109° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .029", 85° ) * approx speed of asteroid's shadow [km/s]: 10.3315 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0089-01141-1 by 304 Olga on 2012 Sep 25 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 Latitude Latitude Latitude Latitude -154 0 0 -34 12 56 16 3 13 50 332 0 -34 41 42 -33 44 15 -35 9 57 -33 16 13 -155 0 0 -33 19 32 16 3 3 51 333 -1 -33 48 28 -32 50 41 -34 16 54 -32 22 28 -156 0 0 -32 25 0 16 2 52 52 334 -2 -32 54 6 -31 55 59 -33 22 42 -31 27 37 -157 0 0 -31 29 22 16 2 40 53 335 -3 -31 58 37 -31 0 11 -32 27 22 -30 31 39 -158 0 0 -30 32 37 16 2 29 54 337 -4 -31 2 2 -30 3 18 -31 30 55 -29 34 38 -159 0 0 -29 34 49 16 2 17 56 338 -5 -30 4 22 -29 5 21 -30 33 24 -28 36 33 -160 0 0 -28 35 59 16 2 4 57 339 -6 -29 5 40 -28 6 24 -29 34 50 -27 37 28 -161 0 0 -27 36 10 16 1 52 58 340 -7 -28 5 58 -27 6 27 -28 35 15 -26 37 24 -162 0 0 -26 35 24 16 1 39 59 342 -8 -27 5 18 -26 5 34 -27 34 42 -25 36 25 -163 0 0 -25 33 43 16 1 25 61 343 -9 -26 3 43 -25 3 47 -26 33 13 -24 34 32 -164 0 0 -24 31 11 16 1 11 62 345 -10 -25 1 17 -24 1 10 -25 30 51 -23 31 50 -165 0 0 -23 27 51 16 0 57 63 347 -11 -23 58 1 -22 57 46 -24 27 40 -22 28 21 -166 0 0 -22 23 47 16 0 43 64 348 -12 -22 54 1 -21 53 38 -23 23 43 -21 24 10 -167 0 0 -21 19 2 16 0 28 66 351 -13 -21 49 19 -20 48 51 -22 19 5 -20 19 20 -168 0 0 -20 13 41 16 0 13 67 353 -14 -20 44 0 -19 43 28 -21 13 48 -19 13 56 -169 0 0 -19 7 48 15 59 58 68 355 -16 -19 38 8 -18 37 34 -20 7 57 -18 8 1 -170 0 0 -18 1 28 15 59 43 69 358 -17 -18 31 48 -17 31 13 -19 1 38 -17 1 40 -171 0 0 -16 54 45 15 59 27 70 1 -18 -17 25 5 -16 24 31 -17 54 53 -15 54 58 -172 0 0 -15 47 44 15 59 11 71 4 -19 -16 18 2 -15 17 32 -16 47 50 -14 48 0 -173 0 0 -14 40 30 15 58 55 72 8 -20 -15 10 46 -14 10 20 -15 40 31 -13 40 51 -174 0 0 -13 33 8 15 58 39 73 12 -21 -14 3 21 -13 3 1 -14 33 3 -12 33 36 -175 0 0 -12 25 44 15 58 23 74 17 -22 -12 55 52 -11 55 41 -13 25 30 -11 26 19 -176 0 0 -11 18 21 15 58 7 75 22 -24 -11 48 24 -10 48 23 -12 17 57 -10 19 6 -177 0 0 -10 11 5 15 57 50 75 28 -25 -10 41 3 - 9 41 13 -11 10 30 - 9 12 2 -178 0 0 - 9 4 1 15 57 34 76 34 -26 - 9 33 52 - 8 34 16 -10 3 13 - 8 5 11 -179 0 0 - 7 57 14 15 57 17 76 40 -27 - 8 26 58 - 7 27 36 - 8 56 12 - 6 58 38 -180 0 0 - 6 50 49 15 57 1 76 46 -28 - 7 20 25 - 6 21 19 - 7 49 31 - 5 52 29 179 0 0 - 5 44 50 15 56 44 76 53 -29 - 6 14 17 - 5 15 28 - 6 43 15 - 4 46 46 178 0 0 - 4 39 22 15 56 28 76 59 -31 - 5 8 40 - 4 10 9 - 5 37 28 - 3 41 36 177 0 0 - 3 34 28 15 56 12 75 64 -32 - 4 3 36 - 3 5 25 - 4 32 15 - 2 37 1 176 0 0 - 2 30 13 15 55 56 75 70 -33 - 2 59 11 - 2 1 20 - 3 27 39 - 1 33 7 175 0 0 - 1 26 40 15 55 40 74 74 -34 - 1 55 27 - 0 57 58 - 2 23 45 - 0 29 55 174 0 0 - 0 23 53 15 55 24 73 79 -35 - 0 52 29 0 4 38 - 1 20 36 0 32 29 173 0 0 0 38 5 15 55 8 72 83 -36 0 9 40 1 6 24 - 0 18 15 1 34 4 172 0 0 1 39 10 15 54 53 71 86 -37 1 10 58 2 7 17 0 43 14 2 34 46 171 0 0 2 39 21 15 54 37 70 89 -38 2 11 21 3 7 16 1 43 49 3 34 33 170 0 0 3 38 34 15 54 22 69 92 -39 3 10 47 4 6 17 2 43 28 4 33 22 169 0 0 4 36 48 15 54 7 68 94 -40 4 9 14 5 4 19 3 42 7 5 31 11 168 0 0 5 34 1 15 53 53 67 96 -41 5 6 39 6 1 19 4 39 45 6 27 59 167 0 0 6 30 11 15 53 38 66 98 -42 6 3 2 6 57 15 5 36 21 7 23 43 166 0 0 7 25 16 15 53 24 65 99 -43 6 58 20 7 52 8 6 31 52 8 18 23 165 0 0 8 19 16 15 53 11 64 100 -44 7 52 33 8 45 54 7 26 18 9 11 57 164 0 0 9 12 9 15 52 57 62 102 -45 8 45 39 9 38 34 8 19 36 10 4 24 163 0 0 10 3 54 15 52 44 61 103 -46 9 37 37 10 30 7 9 11 48 10 55 44 162 0 0 10 54 31 15 52 31 60 103 -47 10 28 28 11 20 31 10 2 51 11 45 56 161 0 0 11 44 0 15 52 19 59 104 -48 11 18 9 12 9 47 10 52 45 12 34 59 160 0 0 12 32 20 15 52 6 58 105 -49 12 6 42 12 57 54 11 41 31 13 22 54 159 0 0 13 19 31 15 51 54 56 105 -49 12 54 6 13 44 52 12 29 7 14 9 40 158 0 0 14 5 33 15 51 43 55 106 -50 13 40 20 14 30 42 13 15 34 14 55 17 157 0 0 14 50 26 15 51 31 54 106 -51 14 25 26 15 15 23 14 0 52 15 39 46 156 0 0 15 34 11 15 51 20 53 106 -52 15 9 23 15 58 55 14 45 1 16 23 7 155 0 0 16 16 47 15 51 9 52 107 -52 15 52 11 16 41 20 15 28 1 17 5 20 154 0 0 16 58 16 15 50 59 51 107 -53 16 33 52 17 22 37 16 9 53 17 46 25 153 0 0 17 38 37 15 50 49 49 107 -54 17 14 25 18 2 46 16 50 37 18 26 24 152 0 0 18 17 52 15 50 39 48 107 -54 17 53 50 18 41 50 17 30 15 19 5 16 151 0 0 18 56 0 15 50 29 47 107 -55 18 32 10 19 19 47 18 8 45 19 43 3 150 0 0 19 33 3 15 50 20 46 107 -56 19 9 24 19 56 40 18 46 10 20 19 44 149 0 0 20 9 2 15 50 11 45 107 -56 19 45 33 20 32 28 19 22 30 20 55 22 148 0 0 20 43 57 15 50 2 44 107 -57 20 20 38 21 7 12 19 57 45 21 29 56 147 0 0 21 17 48 15 49 53 43 107 -57 20 54 40 21 40 53 20 31 57 22 3 28 146 0 0 21 50 37 15 49 45 42 106 -58 21 27 39 22 13 33 21 5 6 22 35 58 145 0 0 22 22 25 15 49 37 41 106 -58 21 59 37 22 45 11 21 37 13 23 7 27 144 0 0 22 53 13 15 49 30 40 106 -59 22 30 33 23 15 49 22 8 19 23 37 56 143 0 0 23 23 0 15 49 22 39 106 -59 23 0 30 23 45 28 22 38 24 24 7 25 142 0 0 23 51 49 15 49 15 37 106 -59 23 29 28 24 14 8 23 7 30 24 35 57 141 0 0 24 19 40 15 49 8 36 105 -60 23 57 27 24 41 50 23 35 38 25 3 31 140 0 0 24 46 33 15 49 1 35 105 -60 24 24 29 25 8 35 24 2 48 25 30 8 139 0 0 25 12 31 15 48 55 34 105 -60 24 50 34 25 34 24 24 29 1 25 55 50 138 0 0 25 37 32 15 48 48 33 104 -60 25 15 44 25 59 19 24 54 19 26 20 36 137 0 0 26 1 40 15 48 42 32 104 -61 25 39 58 26 23 18 25 18 41 26 44 29 136 0 0 26 24 53 15 48 36 31 104 -61 26 3 19 26 46 24 25 42 9 27 7 28 135 0 0 26 47 13 15 48 31 30 103 -61 26 25 46 27 8 38 26 4 43 27 29 35 134 0 0 27 8 41 15 48 25 29 103 -61 26 47 21 27 29 59 26 26 24 27 50 49 133 0 0 27 29 18 15 48 20 29 103 -61 27 8 4 27 50 30 26 47 14 28 11 13 132 0 0 27 49 4 15 48 15 28 102 -61 27 27 56 28 10 9 27 7 12 28 30 47 131 0 0 28 8 0 15 48 10 27 102 -61 27 46 58 28 28 59 27 26 20 28 49 31 130 0 0 28 26 6 15 48 6 26 101 -61 28 5 11 28 47 0 27 44 38 29 7 27 129 0 0 28 43 24 15 48 1 25 101 -61 28 22 34 29 4 13 28 2 7 29 24 34 128 0 0 28 59 54 15 47 57 24 100 -61 28 39 9 29 20 37 28 18 47 29 40 54 127 0 0 29 15 37 15 47 53 23 100 -61 28 54 57 29 36 15 28 34 40 29 56 26 126 0 0 29 30 33 15 47 49 22 100 -61 29 9 58 29 51 6 28 49 45 30 11 13 125 0 0 29 44 43 15 47 45 21 99 -61 29 24 12 30 5 11 29 4 4 30 25 14 124 0 0 29 58 7 15 47 42 20 99 -61 29 37 40 30 18 31 29 17 36 30 38 29 123 0 0 30 10 46 15 47 38 19 98 -61 29 50 23 30 31 6 29 30 23 30 51 1 122 0 0 30 22 40 15 47 35 18 98 -61 30 2 21 30 42 57 29 42 25 31 2 47 121 0 0 30 33 51 15 47 32 17 97 -61 30 13 35 30 54 4 29 53 43 31 13 51 120 0 0 30 44 17 15 47 29 17 97 -61 30 24 6 31 4 27 30 4 16 31 24 11 119 0 0 30 54 1 15 47 27 16 96 -60 30 33 52 31 14 7 30 14 6 31 33 48 118 0 0 31 3 2 15 47 24 15 96 -60 30 42 56 31 23 5 30 23 12 31 42 43 117 0 0 31 11 20 15 47 22 14 95 -60 30 51 17 31 31 21 30 31 36 31 50 56 116 0 0 31 18 56 15 47 19 13 95 -60 30 58 56 31 38 55 30 39 17 31 58 28 115 0 0 31 25 51 15 47 17 12 94 -59 31 5 53 31 45 47 30 46 16 32 5 18 114 0 0 31 32 4 15 47 15 11 94 -59 31 12 8 31 51 58 30 52 34 32 11 27 113 0 0 31 37 36 15 47 13 10 93 -59 31 17 42 31 57 29 30 58 9 32 16 55 112 0 0 31 42 27 15 47 12 10 93 -58 31 22 34 32 2 18 31 3 4 32 21 43 111 0 0 31 46 38 15 47 10 9 92 -58 31 26 46 32 6 27 31 7 17 32 25 51 110 0 0 31 50 8 15 47 9 8 92 -58 31 30 18 32 9 56 31 10 50 32 29 19 109 0 0 31 52 58 15 47 8 7 91 -57 31 33 9 32 12 45 31 13 42 32 32 7 108 0 0 31 55 8 15 47 7 6 91 -57 31 35 20 32 14 54 31 15 53 32 34 15 107 0 0 31 56 38 15 47 6 5 90 -57 31 36 50 32 16 24 31 17 24 32 35 44 106 0 0 31 57 28 15 47 5 4 89 -56 31 37 41 32 17 13 31 18 15 32 36 34 105 0 0 31 57 38 15 47 4 4 89 -56 31 37 51 32 17 24 31 18 26 32 36 44 104 0 0 31 57 9 15 47 4 3 88 -55 31 37 22 32 16 55 31 17 57 32 36 15 103 0 0 31 56 1 15 47 3 2 88 -55 31 36 13 32 15 46 31 16 48 32 35 6 102 0 0 31 54 12 15 47 3 1 87 -54 31 34 25 32 13 58 31 14 59 32 33 19 101 0 0 31 51 45 15 47 3 0 87 -54 31 31 56 32 11 31 31 12 30 32 30 52 Uncertainty in time = +/- 3 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: TYC 0089-01141-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 55 41.1326 DE: +02 48 47.813 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .023, .027 ) * V mag [mag]: 9.3 * B mag [mag]: 9.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (304) Olga approx. diameter [km]: 71 approx. diameter ["]: .060 distance from Earth [AU]: 1.62500 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1020 number of rejected observations: 82 time covered by the observations: 1903 May 20 - 2011 Jul 05 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.011, 78° remarks: * orbital elements for (304) Olga : Mean anomaly = 51.97946832 deg Arg. of pericenter = 172.50735512 deg Long. of node = 159.16444958 deg Inclination = 15.83731095 deg Eccentricity = 0.22086518 Semimajor axis = 2.40438250 AU Perihelion dist = 1.87333812 AU Mag: H = 9.72, G = 0.07 Epoch of elements : MJD 56195.65800000 TDT (2012 Sep 25.658) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 25 304 Olga 15h 57.0m UT 9.3 4 55 41.133 2 48 47.81TYC 0089-01141-1 9.7 13.8 71 6.9 1.625 1.472 -22.55 -170.1989 2.819 -61.38 -1.19 15.9499 -0.17314 -0.16535 4.08078 -4.16563 -0.00509 0.00003 2000 50.4837092012 920.00000172.507355159.164450 15.8373110.22086518 2.4043825 1.8733381 9.7 5.00.07 RATE 2.6436180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.029 85 1.49 0.029 0 0-4 3 056146.0020120925_1141-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 21:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org