IOTA/IOTA-ES occultation update for (1186) Turnera / UCAC2 41842221 event on 2009 Nov 10, 17:26 UT Visible from Summary ------- On 2009 Nov 10 UT, the 36 km diameter asteroid (1186) Turnera will occult a 11.4 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.8 mag (the magnitude of the asteroid) for at most 3.2 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: 53 * date and approx. time of event: 2009 Nov 10, 17:20 - 2009 Nov 10, 17:34 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 3.2 * Moon: 38 % sunlit, 78° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 1.21 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .026", 78° ) * approx speed of asteroid's shadow [km/s]: 11.2315 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 41842221 by 1186 Turnera on 2009 Nov 10 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 ' " Latitude Latitude Latitude Latitude 44 0 0 -22 38 9 17 34 24 1 58 -28 -22 22 54 -22 53 28 .. .. .. -23 30 49 45 0 0 -22 4 54 17 34 24 2 58 -29 -21 49 45 -22 20 7 .. .. .. -22 57 15 46 0 0 -21 32 18 17 34 23 3 57 -30 -21 17 14 -21 47 25 .. .. .. -22 24 19 47 0 0 -21 0 21 17 34 22 4 57 -31 -20 45 22 -21 15 23 -20 9 25 -21 52 2 48 0 0 -20 29 3 17 34 21 5 57 -32 -20 14 10 -20 43 59 -19 38 25 -21 20 26 49 0 0 -19 58 25 17 34 20 6 56 -33 -19 43 37 -20 13 16 -19 8 5 -20 49 29 50 0 0 -19 28 27 17 34 18 7 56 -34 -19 13 45 -19 43 13 -18 38 25 -20 19 14 51 0 0 -18 59 10 17 34 16 8 56 -36 -18 44 33 -19 13 51 -18 9 25 -19 49 39 52 0 0 -18 30 34 17 34 14 9 55 -37 -18 16 2 -18 45 10 -17 41 5 -19 20 46 53 0 0 -18 2 40 17 34 12 11 55 -38 -17 48 12 -18 17 11 -17 13 27 -18 52 34 54 0 0 -17 35 27 17 34 9 12 55 -39 -17 21 4 -17 49 53 -16 46 30 -18 25 5 55 0 0 -17 8 55 17 34 6 13 54 -40 -16 54 37 -17 23 17 -16 20 14 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0 0 -14 11 12 17 25 28 47 358 -48 -13 57 30 -14 24 56 -13 24 35 -14 58 24 124 0 0 -14 31 56 17 25 19 47 357 -47 -14 18 11 -14 45 44 -13 45 8 -15 19 19 125 0 0 -14 53 20 17 25 9 46 356 -46 -14 39 32 -15 7 11 -14 6 21 -15 40 55 126 0 0 -15 15 24 17 25 0 46 355 -45 -15 1 32 -15 29 18 -14 28 13 -16 3 11 127 0 0 -15 38 7 17 24 50 45 354 -44 -15 24 12 -15 52 5 -14 50 44 -16 26 8 128 0 0 -16 1 30 17 24 41 45 353 -43 -15 47 31 -16 15 32 -15 13 54 -16 49 44 129 0 0 -16 25 32 17 24 32 44 351 -42 -16 11 29 -16 39 38 -15 37 43 -17 13 59 130 0 0 -16 50 14 17 24 23 44 350 -41 -16 36 7 -17 4 23 -16 2 11 -17 38 54 131 0 0 -17 15 34 17 24 14 43 349 -40 -17 1 23 -17 29 48 -16 27 18 -18 4 29 132 0 0 -17 41 33 17 24 5 43 348 -40 -17 27 18 -17 55 51 -16 53 3 -18 30 43 133 0 0 -18 8 11 17 23 56 42 347 -39 -17 53 51 -18 22 33 -17 19 26 -18 57 35 134 0 0 -18 35 26 17 23 47 41 346 -38 -18 21 3 -18 49 54 -17 46 27 -19 25 7 135 0 0 -19 3 20 17 23 38 41 345 -37 -18 48 52 -19 17 52 -18 14 6 -19 53 16 136 0 0 -19 31 52 17 23 29 40 344 -36 -19 17 19 -19 46 28 -18 42 22 -20 22 4 137 0 0 -20 1 1 17 23 21 39 343 -35 -19 46 24 -20 15 42 -19 11 15 -20 51 30 138 0 0 -20 30 47 17 23 12 39 342 -34 -20 16 5 -20 45 33 -19 40 45 -21 21 33 139 0 0 -21 1 9 17 23 4 38 342 -33 -20 46 22 -21 16 0 -20 10 51 -21 52 12 140 0 0 -21 32 8 17 22 55 37 341 -31 -21 17 16 -21 47 4 -20 41 33 -22 23 29 141 0 0 -22 3 42 17 22 47 36 340 -30 -21 48 45 -22 18 44 -21 12 50 -22 55 21 142 0 0 -22 35 52 17 22 39 35 339 -29 -22 20 50 -22 50 58 -21 44 42 -23 27 49 143 0 0 -23 8 36 17 22 32 35 338 -28 -22 53 29 -23 23 48 -22 17 9 -24 0 51 144 0 0 -23 41 54 17 22 24 34 337 -27 -23 26 41 -23 57 11 -22 50 9 -24 34 28 145 0 0 -24 15 46 17 22 16 33 337 -26 -24 0 27 -24 31 8 -23 23 42 -25 8 39 146 0 0 -24 50 10 17 22 9 32 336 -25 -24 34 46 -25 5 38 -23 57 48 -25 43 23 147 0 0 -25 25 6 17 22 2 31 335 -24 -25 9 36 -25 40 40 -24 32 25 -26 18 38 148 0 0 -26 0 33 17 21 55 30 334 -23 -25 44 58 -26 16 13 -25 7 33 -26 54 26 149 0 0 -26 36 31 17 21 48 29 334 -22 -26 20 50 -26 52 16 -25 43 12 -27 30 43 150 0 0 -27 12 58 17 21 41 28 333 -21 -26 57 11 -27 28 49 -26 19 19 -28 7 31 151 0 0 -27 49 53 17 21 35 27 332 -20 -27 34 1 -28 5 50 -26 55 55 -28 44 46 152 0 0 -28 27 16 17 21 28 26 331 -19 -28 11 18 -28 43 19 -27 32 59 -29 22 30 153 0 0 -29 5 5 17 21 22 25 331 -18 -28 49 1 -29 21 14 -28 10 28 -30 0 40 154 0 0 -29 43 20 17 21 16 25 330 -17 -29 27 10 -29 59 35 -28 48 23 -30 39 16 155 0 0 -30 21 59 17 21 11 24 329 -16 -30 5 43 -30 38 20 -29 26 42 -31 18 15 156 0 0 -31 1 0 17 21 5 23 329 -15 -30 44 39 -31 17 27 -30 5 24 -31 57 38 157 0 0 -31 40 24 17 21 0 22 328 -14 -31 23 56 -31 56 56 -30 44 27 -32 37 22 158 0 0 -32 20 7 17 20 55 21 327 -13 -32 3 34 -32 36 46 -31 23 51 -33 17 26 159 0 0 -33 0 9 17 20 50 20 327 -12 -32 43 30 -33 16 54 -32 3 34 -33 57 49 160 0 0 -33 40 29 17 20 46 19 326 -10 -33 23 44 -33 57 20 -32 43 34 -34 38 30 161 0 0 -34 21 5 17 20 42 18 326 -9 -34 4 14 -34 38 1 -33 23 50 -35 19 26 162 0 0 -35 1 55 17 20 38 16 325 -8 -34 44 58 -35 18 57 -34 4 21 -36 0 36 163 0 0 -35 42 57 17 20 34 15 324 -7 -35 25 55 -36 0 5 -34 45 5 -36 41 58 164 0 0 -36 24 11 17 20 30 14 324 -6 -36 7 3 -36 41 24 -35 26 0 -37 23 31 165 0 0 -37 5 33 17 20 27 13 323 -5 -36 48 20 -37 22 52 -36 7 4 -38 5 13 166 0 0 -37 47 4 17 20 24 12 322 -4 -37 29 45 -38 4 28 -36 48 17 -38 47 2 167 0 0 -38 28 39 17 20 21 11 322 -3 -38 11 16 -38 46 9 -37 29 36 -39 28 56 168 0 0 -39 10 19 17 20 19 10 321 -2 -38 52 51 -39 27 54 -38 10 59 -40 10 54 169 0 0 -39 52 1 17 20 16 9 320 -1 -39 34 28 -40 9 41 -38 52 24 -40 52 53 170 0 0 -40 33 43 17 20 14 8 320 0 -40 16 5 -40 51 27 -39 33 50 -41 34 51 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 41842221 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 52 04.1739 DE: +28 45 55.308 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .017 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1186) Turnera approx. diameter [km]: 36 approx. diameter ["]: .024 distance from Earth [AU]: 2.07100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 800 number of rejected observations: 61 time covered by the observations: 1929 Aug 01 - 2007 Sep 09 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.019, 74° remarks: * orbital elements for (1186) Turnera : Mean anomaly = 77.89387596 deg Arg. of pericenter = 293.72462877 deg Long. of node = 43.12188123 deg Inclination = 10.74025706 deg Eccentricity = 0.10573917 Semimajor axis = 3.01886837 AU Perihelion dist = 2.69965573 AU Mag: H = 9.66, G = 0.15 Epoch of elements : MJD 55145.72700000 TDT (2009 Nov 10.727) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 10 1186 Turnera 17h 27.2m UT 11.4 4 52 4.174 28 45 55.31UCAC2 41842221 0.0 13.8 36 3.2 2.071 -1.984 6.67 121.2012 28.763 -85.82 -17.32 17.4541 -0.16170 -0.63364 -6.14112 1.57300 -0.00262 -0.00088 2000 76.817745200911 5.00000293.724629 43.121881 10.7402570.10573917 3.0188684 2.6996557 9.2 5.00.15 RATE 1.8790480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.026 78 2.21 0.029 0 54545.5020091110_842221 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 16:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org