IOTA/IOTA-ES occultation update for (167) Urda / TYC 1275-00583-1 event on 2012 Oct 27, 14:51 UT Visible from New Zealand Summary ------- On 2012 Oct 27 UT, the 38 km diameter asteroid (167) Urda will occult a 11.8 mag star in the constellation Taurus for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.7 mag (the magnitude of the asteroid) for at most 5.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 39 * date and approx. time of event: 2012 Oct 27, 14:45 - 2012 Oct 27, 15:00 UT * geocentric midpoint of event [JD]: 2456228.1191875 * magnitude of target star: 11.8 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 5.2 * Moon: 96 % sunlit, 62° distance * Sun: 143° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 1.70 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .034", 359° ) * approx speed of asteroid's shadow [km/s]: 7.3323 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1275-00583-1 by 167 Urda on 2012 Oct 27 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 118 31 4 -60 0 0 15 0 27 1 47 -16 117 40 14 119 21 56 ... .. .. 122 15 11 120 42 29 -59 0 0 15 0 26 2 45 -18 119 53 1 121 31 59 ... .. .. 124 20 50 Latitude Latitude Latitude Latitude 121 0 0 -58 51 53 15 0 26 3 45 -18 -58 29 8 -59 14 54 .. .. .. -60 35 15 122 0 0 -58 23 54 15 0 25 3 44 -18 -58 1 10 -58 46 53 .. .. .. -60 7 9 123 0 0 -57 55 37 15 0 24 4 43 -19 -57 32 55 -58 18 35 .. .. .. -59 38 45 124 0 0 -57 27 4 15 0 23 5 42 -19 -57 4 24 -57 50 0 -55 49 10 -59 10 2 125 0 0 -56 58 16 15 0 21 5 42 -20 -56 35 39 -57 21 9 -55 20 32 -58 41 2 126 0 0 -56 29 14 15 0 19 6 41 -20 -56 6 39 -56 52 4 -54 51 41 -58 11 47 127 0 0 -55 59 58 15 0 17 7 40 -21 -55 37 26 -56 22 45 -54 22 38 -57 42 17 128 0 0 -55 30 30 15 0 15 8 39 -22 -55 8 2 -55 53 14 -53 53 25 -57 12 33 129 0 0 -55 0 51 15 0 13 8 38 -22 -54 38 27 -55 23 31 -53 24 1 -56 42 37 130 0 0 -54 31 3 15 0 10 9 37 -23 -54 8 42 -54 53 39 -52 54 29 -56 12 30 131 0 0 -54 1 6 15 0 7 10 37 -23 -53 38 49 -54 23 37 -52 24 50 -55 42 12 132 0 0 -53 31 1 15 0 3 11 36 -24 -53 8 49 -53 53 28 -51 55 4 -55 11 47 133 0 0 -53 0 51 15 0 0 11 35 -24 -52 38 43 -53 23 13 -51 25 13 -54 41 14 134 0 0 -52 30 35 14 59 56 12 34 -25 -52 8 33 -52 52 52 -50 55 18 -54 10 34 135 0 0 -52 0 16 14 59 52 13 33 -25 -51 38 18 -52 22 28 -50 25 20 -53 39 50 136 0 0 -51 29 54 14 59 47 14 32 -25 -51 8 2 -51 52 0 -49 55 20 -53 9 3 137 0 0 -50 59 31 14 59 43 14 32 -26 -50 37 44 -51 21 31 -49 25 20 -52 38 13 138 0 0 -50 29 7 14 59 38 15 31 -26 -50 7 26 -50 51 2 -48 55 20 -52 7 23 139 0 0 -49 58 45 14 59 32 16 30 -27 -49 37 10 -50 20 34 -48 25 22 -51 36 33 140 0 0 -49 28 25 14 59 27 17 29 -27 -49 6 55 -49 50 7 -47 55 27 -51 5 44 141 0 0 -48 58 8 14 59 21 17 28 -27 -48 36 45 -49 19 44 -47 25 35 -50 34 58 142 0 0 -48 27 56 14 59 15 18 28 -28 -48 6 39 -48 49 26 -46 55 49 -50 4 17 143 0 0 -47 57 49 14 59 8 19 27 -28 -47 36 38 -48 19 13 -46 26 9 -49 33 40 144 0 0 -47 27 49 14 59 2 20 26 -29 -47 6 45 -47 49 7 -45 56 36 -49 3 10 145 0 0 -46 57 58 14 58 55 20 25 -29 -46 37 0 -47 19 8 -45 27 11 -48 32 48 146 0 0 -46 28 15 14 58 48 21 24 -29 -46 7 23 -46 49 19 -44 57 55 -48 2 34 147 0 0 -45 58 42 14 58 40 22 23 -29 -45 37 57 -46 19 39 -44 28 50 -47 32 30 148 0 0 -45 29 20 14 58 32 22 22 -30 -45 8 41 -45 50 10 -43 59 55 -47 2 37 149 0 0 -45 0 10 14 58 24 23 22 -30 -44 39 38 -45 20 54 -43 31 13 -46 32 56 150 0 0 -44 31 13 14 58 16 24 21 -30 -44 10 48 -44 51 50 -43 2 43 -46 3 28 151 0 0 -44 2 30 14 58 8 25 20 -30 -43 42 11 -44 23 0 -42 34 28 -45 34 14 152 0 0 -43 34 2 14 57 59 25 19 -30 -43 13 49 -43 54 25 -42 6 27 -45 5 15 153 0 0 -43 5 49 14 57 50 26 18 -31 -42 45 43 -43 26 6 -41 38 41 -44 36 31 154 0 0 -42 37 53 14 57 41 27 17 -31 -42 17 53 -42 58 3 -41 11 13 -44 8 5 155 0 0 -42 10 14 14 57 31 27 16 -31 -41 50 21 -42 30 18 -40 44 1 -43 39 55 156 0 0 -41 42 53 14 57 22 28 15 -31 -41 23 7 -42 2 50 -40 17 7 -43 12 4 157 0 0 -41 15 51 14 57 12 28 14 -31 -40 56 11 -41 35 42 -39 50 31 -42 44 32 158 0 0 -40 49 9 14 57 2 29 13 -31 -40 29 35 -41 8 53 -39 24 15 -42 17 21 159 0 0 -40 22 47 14 56 51 30 12 -31 -40 3 19 -40 42 25 -38 58 19 -41 50 29 160 0 0 -39 56 46 14 56 41 30 11 -31 -39 37 24 -40 16 17 -38 32 44 -41 23 59 161 0 0 -39 31 6 14 56 30 31 10 -31 -39 11 50 -39 50 32 -38 7 30 -40 57 51 162 0 0 -39 5 49 14 56 19 31 9 -31 -38 46 39 -39 25 8 -37 42 38 -40 32 6 163 0 0 -38 40 54 14 56 8 32 8 -31 -38 21 50 -39 0 8 -37 18 8 -40 6 44 164 0 0 -38 16 23 14 55 57 32 7 -31 -37 57 25 -38 35 30 -36 54 1 -39 41 45 165 0 0 -37 52 15 14 55 46 33 6 -31 -37 33 23 -38 11 17 -36 30 17 -39 17 11 166 0 0 -37 28 32 14 55 34 33 5 -30 -37 9 45 -37 47 29 -36 6 58 -38 53 2 167 0 0 -37 5 14 14 55 23 34 4 -30 -36 46 33 -37 24 5 -35 44 3 -38 29 18 168 0 0 -36 42 22 14 55 11 34 3 -30 -36 23 45 -37 1 7 -35 21 32 -38 6 1 169 0 0 -36 19 55 14 54 59 35 2 -30 -36 1 24 -36 38 34 -34 59 28 -37 43 9 170 0 0 -35 57 54 14 54 47 35 1 -30 -35 39 28 -36 16 28 -34 37 49 -37 20 44 171 0 0 -35 36 20 14 54 35 35 360 -29 -35 17 59 -35 54 49 -34 16 36 -36 58 47 172 0 0 -35 15 13 14 54 23 36 359 -29 -34 56 57 -35 33 37 -33 55 49 -36 37 17 173 0 0 -34 54 33 14 54 11 36 358 -29 -34 36 22 -35 12 53 -33 35 30 -36 16 15 174 0 0 -34 34 21 14 53 58 36 356 -28 -34 16 15 -34 52 36 -33 15 38 -35 55 41 175 0 0 -34 14 37 14 53 46 37 355 -28 -33 56 35 -34 32 48 -32 56 13 -35 35 36 176 0 0 -33 55 22 14 53 33 37 354 -28 -33 37 24 -34 13 28 -32 37 16 -35 16 0 177 0 0 -33 36 35 14 53 21 37 353 -27 -33 18 42 -33 54 37 -32 18 47 -34 56 54 178 0 0 -33 18 18 14 53 8 37 352 -27 -33 0 28 -33 36 15 -32 0 47 -34 38 17 179 0 0 -33 0 29 14 52 55 37 351 -26 -32 42 44 -33 18 22 -31 43 16 -34 20 9 180 0 0 -32 43 10 14 52 43 37 350 -26 -32 25 29 -33 0 59 -31 26 13 -34 2 32 -179 0 0 -32 26 21 14 52 30 38 348 -25 -32 8 43 -32 44 6 -31 9 40 -33 45 25 -178 0 0 -32 10 2 14 52 17 38 347 -25 -31 52 28 -32 27 43 -30 53 36 -33 28 49 -177 0 0 -31 54 13 14 52 4 38 346 -24 -31 36 42 -32 11 51 -30 38 2 -33 12 44 -176 0 0 -31 38 54 14 51 52 38 345 -24 -31 21 27 -31 56 29 -30 22 58 -32 57 10 -175 0 0 -31 24 6 14 51 39 38 344 -23 -31 6 43 -31 41 37 -30 8 24 -32 42 7 -174 0 0 -31 9 49 14 51 26 38 343 -23 -30 52 29 -31 27 17 -29 54 21 -32 27 35 -173 0 0 -30 56 4 14 51 13 38 342 -22 -30 38 46 -31 13 28 -29 40 47 -32 13 35 -172 0 0 -30 42 49 14 51 0 38 340 -22 -30 25 34 -31 0 11 -29 27 45 -32 0 7 -171 0 0 -30 30 5 14 50 48 38 339 -21 -30 12 53 -30 47 24 -29 15 13 -31 47 11 -170 0 0 -30 17 54 14 50 35 38 338 -20 -30 0 44 -30 35 10 -29 3 12 -31 34 47 -169 0 0 -30 6 14 14 50 22 37 337 -20 -29 49 6 -30 23 27 -28 51 43 -31 22 56 -168 0 0 -29 55 5 14 50 10 37 336 -19 -29 38 0 -30 12 17 -28 40 45 -31 11 36 -167 0 0 -29 44 29 14 49 57 37 335 -19 -29 27 26 -30 1 38 -28 30 18 -31 0 50 -166 0 0 -29 34 25 14 49 45 37 334 -18 -29 17 24 -29 51 32 -28 20 22 -30 50 36 -165 0 0 -29 24 53 14 49 32 37 333 -17 -29 7 55 -29 41 58 -28 10 59 -30 40 55 -164 0 0 -29 15 54 14 49 20 36 332 -17 -28 58 57 -29 32 57 -28 2 7 -30 31 47 -163 0 0 -29 7 27 14 49 7 36 331 -16 -28 50 32 -29 24 28 -27 53 48 -30 23 12 -162 0 0 -28 59 32 14 48 55 36 330 -15 -28 42 39 -29 16 32 -27 46 0 -30 15 11 -161 0 0 -28 52 11 14 48 43 36 329 -14 -28 35 19 -29 9 9 -27 38 45 -30 7 42 -160 0 0 -28 45 22 14 48 31 35 328 -14 -28 28 32 -29 2 19 -27 32 2 -30 0 48 -159 0 0 -28 39 7 14 48 19 35 327 -13 -28 22 17 -28 56 3 -27 25 51 -29 54 27 -158 0 0 -28 33 24 14 48 7 34 326 -12 -28 16 36 -28 50 19 -27 20 13 -29 48 39 -157 0 0 -28 28 15 14 47 56 34 325 -12 -28 11 27 -28 45 9 -27 15 7 -29 43 25 -156 0 0 -28 23 39 14 47 44 34 324 -11 -28 6 52 -28 40 32 -27 10 35 -29 38 46 -155 0 0 -28 19 36 14 47 33 33 323 -10 -28 2 50 -28 36 28 -27 6 35 -29 34 40 -154 0 0 -28 16 7 14 47 21 33 322 -9 -27 59 21 -28 32 58 -27 3 8 -29 31 8 -153 0 0 -28 13 11 14 47 10 32 321 -8 -27 56 26 -28 30 2 -27 0 14 -29 28 11 -152 0 0 -28 10 49 14 46 59 32 320 -8 -27 54 4 -28 27 40 -26 57 53 -29 25 47 -151 0 0 -28 9 1 14 46 48 31 319 -7 -27 52 16 -28 25 52 -26 56 5 -29 23 58 -150 0 0 -28 7 46 14 46 37 31 318 -6 -27 51 2 -28 24 37 -26 54 51 -29 22 44 -149 0 0 -28 7 6 14 46 27 30 318 -5 -27 50 21 -28 23 57 -26 54 10 -29 22 4 -148 0 0 -28 6 59 14 46 17 30 317 -5 -27 50 14 -28 23 51 -26 54 2 -29 21 59 -147 0 0 -28 7 27 14 46 6 29 316 -4 -27 50 41 -28 24 19 -26 54 28 -29 22 28 -146 0 0 -28 8 28 14 45 56 28 315 -3 -27 51 42 -28 25 21 -26 55 28 -29 23 32 -145 0 0 -28 10 4 14 45 47 28 315 -2 -27 53 18 -28 26 57 -26 57 1 -29 25 11 -144 0 0 -28 12 15 14 45 37 27 314 -1 -27 55 27 -28 29 8 -26 59 8 -29 27 25 -143 0 0 -28 14 59 14 45 27 26 313 0 -27 58 11 -28 31 54 -27 1 48 -29 30 14 Uncertainty in time = +/- 9 secs Prediction of 2012 Sep 3.0 Data for the target star ------------------------ * name: TYC 1275-00583-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 42 37.9448 DE: +19 13 35.736 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .043 ) * V mag [mag]: 11.8 * B mag [mag]: 12.9 * Apparent position with proper motion RA(deg): 70.8547084748 DE(deg): 19.2501507950 * Equation of equinoxes (radians) : 0.000058655310319 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (167) Urda approx. diameter [km]: 38 approx. diameter ["]: .026 distance from Earth [AU]: 2.05400 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1318 number of rejected observations: 134 time covered by the observations: 1905 Aug 23 - 2012 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.012, 82° remarks: * orbital elements for (167) Urda : Mean anomaly = 118.72895634 deg Arg. of pericenter = 131.33470681 deg Long. of node = 166.38794474 deg Inclination = 2.20972777 deg Eccentricity = 0.03391238 Semimajor axis = 2.85715120 AU Perihelion dist = 2.76025840 AU Mag: H = 9.14, G = 0.15 Epoch of elements : MJD 56227.61900000 TDT (2012 Oct 27.619) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 27 167 Urda 14h 51.6m UT 11.8 4 42 37.945 19 13 35.74TYC 1275-00583-1 12.9 13.7 38 5.2 2.054 -1.211 -4.54 171.3827 19.227 -46.94 -13.05 14.8605 0.19944 -0.76273 -4.00058 -1.05972 -0.00353 -0.00023 2000 117.17405720121020.00000131.334707166.387945 2.2097280.03391238 2.8571512 2.7602584 9.1 5.00.15 RATE 2.0408180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.034 359 2.70 0.044 0 0-2-4 056173.0020121027_0583-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 03, 20:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org