IOTA/IOTA-ES occultation update for (694) Ekard / TYC 1091-01624-1 event on 2009 Jul 05, 16:09 UT Visible from Australia, China Summary ------- On 2009 Jul 05 UT, the 99 km diameter asteroid (694) Ekard will occult a 9.4 mag star in the constellation Delphinus for observers along a path across Australia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 11.6 mag (the magnitude of the asteroid) for at most 13.6 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: . The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2009 Jul 05, 15:55 - 2009 Jul 05, 16:23 UT * magnitude of target star: 9.4 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 13.6 * Moon: 97 % sunlit, 55° distance * Sun: 141° distance * rough path description: Australia, China Additional comments ------------------- 4.9" double star The occultation path -------------------- * approximate projected width [km]: 104 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .050", 82° ) * approx speed of asteroid's shadow [km/s]: 7.2949 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1091-01624-1 by 694 Ekard on 2009 Jul 5 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 -173 50 12 -75 0 0 15 55 58 1 319 -28 -171 22 49 -176 13 7 -169 2 36 -178 21 11 -176 59 52 -74 0 0 15 55 59 3 322 -30 -174 47 2 -179 9 28 -172 41 33 178 53 50 Latitude Latitude Latitude Latitude -178 0 0 -73 38 56 15 55 59 3 323 -30 -72 53 30 -74 24 42 -72 11 58 -75 7 6 -179 0 0 -73 16 51 15 56 0 4 324 -30 -72 30 35 -74 3 27 -71 48 18 -74 46 39 -180 0 0 -72 53 36 15 56 0 4 325 -31 -72 6 29 -73 41 5 -71 23 26 -74 25 6 179 0 0 -72 29 8 15 56 1 5 326 -31 -71 41 8 -73 17 32 -70 57 18 -74 2 24 178 0 0 -72 3 23 15 56 2 5 327 -32 -71 14 28 -72 52 43 -70 29 48 -73 38 28 177 0 0 -71 36 16 15 56 2 6 328 -32 -70 46 24 -72 26 33 -70 0 53 -73 13 14 176 0 0 -71 7 40 15 56 3 6 329 -33 -70 16 50 -71 58 58 -69 30 27 -72 46 35 175 0 0 -70 37 32 15 56 4 7 330 -33 -69 45 41 -71 29 51 -68 58 25 -72 18 27 174 0 0 -70 5 44 15 56 6 7 330 -34 -69 12 52 -70 59 8 -68 24 40 -71 48 44 173 0 0 -69 32 11 15 56 7 8 331 -34 -68 38 16 -70 26 41 -67 49 8 -71 17 19 172 0 0 -68 56 47 15 56 9 9 332 -35 -68 1 46 -69 52 23 -67 11 40 -70 44 6 171 0 0 -68 19 24 15 56 11 10 333 -36 -67 23 17 -69 16 9 -66 32 12 -70 8 57 170 0 0 -67 39 54 15 56 13 10 334 -36 -66 42 40 -68 37 50 -65 50 36 -69 31 45 169 0 0 -66 58 12 15 56 15 11 335 -37 -65 59 49 -67 57 18 -65 6 44 -68 52 22 168 0 0 -66 14 8 15 56 18 12 336 -38 -65 14 37 -67 14 27 -64 20 30 -68 10 39 167 0 0 -65 27 35 15 56 21 13 337 -38 -64 26 54 -66 29 6 -63 31 46 -67 26 29 166 0 0 -64 38 25 15 56 24 14 338 -39 -63 36 34 -65 41 9 -62 40 25 -66 39 42 165 0 0 -63 46 29 15 56 28 15 339 -40 -62 43 30 -64 50 26 -61 46 20 -65 50 9 164 0 0 -62 51 40 15 56 32 16 340 -41 -61 47 32 -63 56 49 -60 49 23 -64 57 41 163 0 0 -61 53 50 15 56 37 17 341 -42 -60 48 35 -63 0 8 -59 49 27 -64 2 10 162 0 0 -60 52 50 15 56 42 18 341 -43 -59 46 31 -62 0 18 -58 46 26 -63 3 26 161 0 0 -59 48 35 15 56 48 19 342 -44 -58 41 14 -60 57 8 -57 40 15 -62 1 21 160 0 0 -58 40 58 15 56 55 20 343 -45 -57 32 38 -59 50 34 -56 30 49 -60 55 47 159 0 0 -57 29 54 15 57 2 22 344 -46 -56 20 40 -58 40 28 -55 18 3 -59 46 39 158 0 0 -56 15 20 15 57 10 23 345 -47 -55 5 15 -57 26 47 -54 1 56 -58 33 50 157 0 0 -54 57 12 15 57 19 24 346 -49 -53 46 23 -56 9 27 -52 42 25 -57 17 17 156 0 0 -53 35 30 15 57 29 26 347 -50 -52 24 3 -54 48 26 -51 19 33 -55 56 58 155 0 0 -52 10 16 15 57 40 27 348 -51 -50 58 17 -53 23 46 -49 53 20 -54 32 52 154 0 0 -50 41 32 15 57 52 29 349 -52 -49 29 9 -51 55 29 -48 23 51 -53 5 1 153 0 0 -49 9 25 15 58 5 30 349 -54 -47 56 45 -50 23 40 -46 51 12 -51 33 31 152 0 0 -47 34 1 15 58 19 32 350 -55 -46 21 12 -48 48 26 -45 15 31 -49 58 28 151 0 0 -45 55 30 15 58 34 34 351 -57 -44 42 40 -47 9 58 -43 36 59 -48 20 1 150 0 0 -44 14 5 15 58 51 36 352 -58 -43 1 21 -45 28 26 -41 55 45 -46 38 23 149 0 0 -42 29 58 15 59 9 37 353 -60 -41 17 28 -43 44 4 -40 12 4 -44 53 47 148 0 0 -40 43 25 15 59 28 39 354 -61 -39 31 16 -41 57 9 -38 26 10 -43 6 30 147 0 0 -38 54 42 15 59 48 41 355 -63 -37 43 0 -40 7 56 -36 38 19 -41 16 49 146 0 0 -37 4 6 16 0 9 43 356 -64 -35 52 59 -38 16 45 -34 48 46 -39 25 2 145 0 0 -35 11 56 16 0 31 45 357 -66 -34 1 28 -36 23 53 -32 57 49 -37 31 28 144 0 0 -33 18 30 16 0 54 47 359 -67 -32 8 46 -34 29 39 -31 5 45 -35 36 29 143 0 0 -31 24 6 16 1 19 49 360 -68 -30 15 10 -32 34 24 -29 12 51 -33 40 22 142 0 0 -29 29 2 16 1 44 51 1 -70 -28 20 58 -30 38 25 -27 19 24 -31 43 29 141 0 0 -27 33 36 16 2 10 53 3 -71 -26 26 26 -28 42 1 -25 25 39 -29 46 8 140 0 0 -25 38 4 16 2 37 54 5 -72 -24 31 51 -26 45 29 -23 31 53 -27 48 37 139 0 0 -23 42 43 16 3 4 56 6 -73 -22 37 28 -24 49 5 -21 38 21 -25 51 13 138 0 0 -21 47 47 16 3 32 58 8 -73 -20 43 31 -22 53 6 -19 45 16 -23 54 13 137 0 0 -19 53 30 16 4 0 60 10 -74 -18 50 15 -20 57 46 -17 52 52 -21 57 51 136 0 0 -18 0 6 16 4 29 61 13 -74 -16 57 50 -19 3 18 -16 1 20 -20 2 20 135 0 0 -16 7 45 16 4 58 63 16 -74 -15 6 30 -17 9 53 -14 10 52 -18 7 54 134 0 0 -14 16 38 16 5 27 65 19 -74 -13 16 23 -15 17 43 -12 21 38 -16 14 43 133 0 0 -12 26 55 16 5 56 66 22 -74 -11 27 39 -13 26 58 -10 33 47 -14 22 57 132 0 0 -10 38 44 16 6 26 67 25 -73 - 9 40 27 -11 37 46 - 8 47 27 -12 32 45 131 0 0 - 8 52 13 16 6 55 68 30 -72 - 7 54 54 - 9 50 14 - 7 2 45 -10 44 15 130 0 0 - 7 7 28 16 7 24 69 34 -71 - 6 11 6 - 8 4 30 - 5 19 47 - 8 57 34 129 0 0 - 5 24 35 16 7 53 70 39 -70 - 4 29 9 - 6 20 39 - 3 38 39 - 7 12 47 128 0 0 - 3 43 39 16 8 21 71 44 -69 - 2 49 7 - 4 38 45 - 1 59 26 - 5 29 59 127 0 0 - 2 4 43 16 8 50 71 49 -68 - 1 11 5 - 2 58 54 - 0 22 11 - 3 49 15 126 0 0 - 0 27 51 16 9 18 72 55 -67 0 24 55 - 1 21 8 1 13 2 - 2 10 37 125 0 0 1 6 54 16 9 45 72 60 -65 1 58 49 0 14 30 2 46 11 - 0 34 9 124 0 0 2 39 30 16 10 12 72 65 -64 3 30 36 1 47 58 4 17 13 1 0 8 123 0 0 4 9 57 16 10 39 72 71 -63 5 0 14 3 19 15 5 46 8 2 32 12 122 0 0 5 38 12 16 11 5 71 75 -61 6 27 42 4 48 19 7 12 53 4 2 3 121 0 0 7 4 16 16 11 30 71 80 -60 7 52 59 6 15 10 8 37 30 5 29 39 120 0 0 8 28 8 16 11 55 70 84 -59 9 16 6 7 39 48 9 59 56 6 55 1 119 0 0 9 49 48 16 12 19 69 88 -57 10 37 3 9 2 13 11 20 13 8 18 8 118 0 0 11 9 17 16 12 43 68 91 -56 11 55 49 10 22 26 12 38 22 9 39 3 117 0 0 12 26 37 16 13 6 67 94 -55 13 12 27 11 40 28 13 54 22 10 57 44 116 0 0 13 41 47 16 13 29 66 96 -54 14 26 57 12 56 20 15 8 16 12 14 15 115 0 0 14 54 50 16 13 51 65 98 -52 15 39 21 14 10 3 16 20 4 13 28 36 114 0 0 16 5 47 16 14 12 64 100 -51 16 49 40 15 21 39 17 29 49 14 40 49 113 0 0 17 14 40 16 14 33 63 102 -50 17 57 56 16 31 10 18 37 31 15 50 55 112 0 0 18 21 31 16 14 53 62 103 -49 19 4 10 17 38 38 19 43 13 16 58 57 111 0 0 19 26 22 16 15 12 61 105 -47 20 8 26 18 44 4 20 46 57 18 4 57 110 0 0 20 29 15 16 15 31 60 106 -46 21 10 44 19 47 32 21 48 44 19 8 57 109 0 0 21 30 12 16 15 49 59 107 -45 22 11 8 20 49 3 22 48 38 20 11 0 108 0 0 22 29 15 16 16 7 58 107 -44 23 9 40 21 48 39 23 46 40 21 11 7 107 0 0 23 26 28 16 16 24 56 108 -43 24 6 21 22 46 23 24 42 53 22 9 21 106 0 0 24 21 52 16 16 41 55 108 -42 25 1 15 23 42 18 25 37 19 23 5 45 105 0 0 25 15 30 16 16 57 54 109 -41 25 54 23 24 36 26 26 30 0 24 0 20 104 0 0 26 7 24 16 17 13 53 109 -40 26 45 48 25 28 49 27 21 0 24 53 11 103 0 0 26 57 37 16 17 28 52 109 -39 27 35 33 26 19 30 28 10 19 25 44 18 102 0 0 27 46 11 16 17 42 51 110 -38 28 23 40 27 8 32 28 58 2 26 33 45 101 0 0 28 33 8 16 17 56 50 110 -37 29 10 12 27 55 56 29 44 10 27 21 33 100 0 0 29 18 32 16 18 10 49 110 -36 29 55 10 28 41 45 30 28 45 28 7 46 99 0 0 30 2 23 16 18 23 48 110 -35 30 38 37 29 26 1 31 11 49 28 52 26 98 0 0 30 44 46 16 18 36 47 110 -34 31 20 36 30 8 48 31 53 26 29 35 35 97 0 0 31 25 41 16 18 48 46 110 -33 32 1 8 30 50 7 32 33 38 30 17 15 96 0 0 32 5 12 16 19 0 45 110 -32 32 40 16 31 30 0 33 12 26 30 57 30 95 0 0 32 43 20 16 19 12 44 109 -31 33 18 2 32 8 29 33 49 52 31 36 19 94 0 0 33 20 7 16 19 23 43 109 -30 33 54 29 32 45 38 34 26 0 32 13 47 93 0 0 33 55 36 16 19 34 42 109 -29 34 29 38 33 21 27 35 0 50 32 49 56 92 0 0 34 29 48 16 19 44 41 109 -28 35 3 30 33 55 59 35 34 25 33 24 46 91 0 0 35 2 46 16 19 54 40 108 -28 35 36 10 34 29 16 36 6 47 33 58 21 90 0 0 35 34 32 16 20 4 39 108 -27 36 7 37 35 1 20 36 37 57 34 30 41 89 0 0 36 5 6 16 20 13 38 108 -26 36 37 54 35 32 12 37 7 58 35 1 50 88 0 0 36 34 32 16 20 22 38 107 -25 37 7 2 36 1 55 37 36 52 35 31 49 87 0 0 37 2 50 16 20 31 37 107 -24 37 35 4 36 30 29 38 4 39 36 0 39 86 0 0 37 30 3 16 20 39 36 106 -24 38 2 1 36 57 58 38 31 21 36 28 22 85 0 0 37 56 11 16 20 48 35 106 -23 38 27 55 37 24 22 38 57 1 36 55 0 84 0 0 38 21 17 16 20 56 34 105 -22 38 52 46 37 49 43 39 21 39 37 20 34 83 0 0 38 45 23 16 21 3 33 105 -21 39 16 38 38 14 2 39 45 18 37 45 6 82 0 0 39 8 28 16 21 11 32 104 -21 39 39 30 38 37 21 40 7 58 38 8 38 81 0 0 39 30 35 16 21 18 32 104 -20 40 1 24 38 59 41 40 29 40 38 31 10 80 0 0 39 51 45 16 21 25 31 103 -19 40 22 22 39 21 3 40 50 27 38 52 44 79 0 0 40 12 0 16 21 31 30 103 -18 40 42 24 39 41 30 41 10 18 39 13 21 78 0 0 40 31 19 16 21 38 29 102 -18 41 1 33 40 1 1 41 29 17 39 33 3 77 0 0 40 49 46 16 21 44 28 102 -17 41 19 48 40 19 38 41 47 22 39 51 50 76 0 0 41 7 19 16 21 50 28 101 -16 41 37 12 40 37 22 42 4 36 40 9 43 75 0 0 41 24 2 16 21 56 27 101 -16 41 53 45 40 54 14 42 21 0 40 26 45 74 0 0 41 39 54 16 22 1 26 100 -15 42 9 27 41 10 15 42 36 35 40 42 55 73 0 0 41 54 56 16 22 6 25 100 -14 42 24 21 41 25 27 42 51 20 40 58 14 72 0 0 42 9 10 16 22 12 25 99 -14 42 38 26 41 39 49 43 5 18 41 12 44 71 0 0 42 22 36 16 22 17 24 98 -13 42 51 44 41 53 23 43 18 29 41 26 25 70 0 0 42 35 15 16 22 21 23 98 -12 43 4 16 42 6 9 43 30 54 41 39 18 69 0 0 42 47 7 16 22 26 22 97 -12 43 16 1 42 18 8 43 42 33 41 51 24 68 0 0 42 58 14 16 22 31 22 96 -11 43 27 2 42 29 21 43 53 27 42 2 43 67 0 0 43 8 35 16 22 35 21 96 -11 43 37 17 42 39 49 44 3 37 42 13 16 66 0 0 43 18 12 16 22 39 20 95 -10 43 46 48 42 49 31 44 13 3 42 23 4 65 0 0 43 27 5 16 22 43 19 95 -9 43 55 36 42 58 29 44 21 46 42 32 7 64 0 0 43 35 14 16 22 47 19 94 -9 44 3 41 43 6 43 44 29 47 42 40 25 63 0 0 43 42 41 16 22 50 18 93 -8 44 11 3 43 14 14 44 37 5 42 47 59 62 0 0 43 49 24 16 22 54 17 93 -8 44 17 42 43 21 1 44 43 41 42 54 50 61 0 0 43 55 25 16 22 57 17 92 -7 44 23 40 43 27 5 44 49 35 43 0 58 60 0 0 44 0 44 16 23 1 16 91 -6 44 28 56 43 32 27 44 54 49 43 6 22 59 0 0 44 5 21 16 23 4 15 91 -6 44 33 30 43 37 7 44 59 21 43 11 4 58 0 0 44 9 16 16 23 7 14 90 -5 44 37 24 43 41 5 45 3 12 43 15 4 57 0 0 44 12 31 16 23 9 14 89 -5 44 40 36 43 44 20 45 6 23 43 18 21 56 0 0 44 15 3 16 23 12 13 89 -4 44 43 8 43 46 54 45 8 54 43 20 56 55 0 0 44 16 55 16 23 14 12 88 -3 44 44 58 43 48 46 45 10 43 43 22 49 54 0 0 44 18 5 16 23 17 12 87 -3 44 46 8 43 49 57 45 11 53 43 24 0 53 0 0 44 18 34 16 23 19 11 87 -2 44 46 37 43 50 26 45 12 22 43 24 29 52 0 0 44 18 22 16 23 21 10 86 -2 44 46 26 43 50 14 45 12 11 43 24 16 51 0 0 44 17 29 16 23 23 9 85 -1 44 45 33 43 49 19 45 11 19 43 23 21 50 0 0 44 15 54 16 23 25 9 85 0 44 44 0 43 47 43 45 9 47 43 21 43 Uncertainty in time = +/- 6 secs Prediction of 2009 Jun 25.0 Data for the target star ------------------------ * name: TYC 1091-01624-1 * constellation : Delphinus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 27 55.8193 DE: +09 57 34.855 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .046, .046 ) * V mag [mag]: 9.4 * B mag [mag]: 9.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (694) Ekard approx. diameter [km]: 99 approx. diameter ["]: .132 distance from Earth [AU]: 1.03200 * orbital information: orbit source: Preston date of fit: 2009 Jun 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 865 number of rejected observations: 79 time covered by the observations: 1909 Nov 09 - 2009 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.019, 73° remarks: * orbital elements for (694) Ekard : Mean anomaly = 338.12832428 deg Arg. of pericenter = 110.87669123 deg Long. of node = 230.40300224 deg Inclination = 15.84239295 deg Eccentricity = 0.32562979 Semimajor axis = 2.66917405 AU Perihelion dist = 1.80001148 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 55017.67300000 TDT (2009 Jul 05.673) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 5 694 Ekard 16h 9.8m UT 9.4 20 27 55.819 9 57 34.85TYC 1091-01624-1 9.6 11.6 99 13.6 1.032 -1.124 30.91 140.7511 9.951 -61.27 22.73 16.1628 -0.27406 -0.14685 -1.94528 3.62892 -0.00171 -0.00261 2000 336.3941052009 628.00000110.876691230.403002 15.8423930.32562979 2.6691741 1.8000115 9.2 5.00.15 RATE 2.2601580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.050 82 1.46 0.061 0 55007.0020090705_1624-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 24, 17:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org