IOTA/IOTA-ES occultation update for (532) Herculina / UCAC2 32816633 event on 2008 Oct 14, 20:02 UT Visible from NW Australia Summary ------- On 2008 Oct 14 UT, the 222 km diameter asteroid (532) Herculina will occult a 11.9 mag star in the constellation Taurus for observers along a path across NW Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 10.7 mag (the magnitude of the asteroid) for at most 32.0 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: 99 * date and approx. time of event: 2008 Oct 14, 19:55 - 2008 Oct 14, 20:15 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 32.0 * Moon: 100 % sunlit, 48° distance * Sun: 134° distance * rough path description: NW Australia The occultation path -------------------- * approximate projected width [km]: 260 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 9.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .041", 359° ) * approx speed of asteroid's shadow [km/s]: 6.9525 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 32816633 by 532 Herculina on 2008 Oct 14 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 22 40 15 -65 0 0 20 15 35 3 76 -13 ... .. .. 33 13 30 ... .. .. 38 16 12 31 29 35 -64 0 0 20 15 29 7 68 -16 20 28 3 39 24 17 ... .. .. 43 36 42 Latitude Latitude Latitude Latitude 32 0 0 -63 55 46 20 15 28 7 68 -16 -62 42 15 -65 10 17 -61 57 8 -65 57 1 33 0 0 -63 47 8 20 15 27 8 67 -16 -62 33 21 -65 1 56 -61 48 6 -65 48 51 34 0 0 -63 38 9 20 15 26 8 66 -17 -62 24 6 -64 53 14 -61 38 41 -65 40 20 35 0 0 -63 28 49 20 15 24 9 65 -17 -62 14 29 -64 44 11 -61 28 54 -65 31 28 36 0 0 -63 19 6 20 15 23 9 64 -17 -62 4 30 -64 34 46 -61 18 44 -65 22 15 37 0 0 -63 9 2 20 15 22 10 63 -17 -61 54 8 -64 25 0 -61 8 11 -65 12 41 38 0 0 -62 58 35 20 15 20 10 62 -18 -61 43 23 -64 14 52 -60 57 15 -65 2 45 39 0 0 -62 47 45 20 15 18 10 62 -18 -61 32 14 -64 4 22 -60 45 56 -64 52 27 40 0 0 -62 36 32 20 15 17 11 61 -18 -61 20 42 -63 53 28 -60 34 13 -64 41 46 41 0 0 -62 24 55 20 15 15 11 60 -19 -61 8 46 -63 42 12 -60 22 5 -64 30 43 42 0 0 -62 12 55 20 15 13 12 59 -19 -60 56 26 -63 30 32 -60 9 33 -64 19 16 43 0 0 -62 0 30 20 15 11 12 58 -19 -60 43 41 -63 18 28 -59 56 36 -64 7 26 44 0 0 -61 47 40 20 15 9 13 57 -19 -60 30 31 -63 6 0 -59 43 14 -63 55 12 45 0 0 -61 34 26 20 15 7 13 56 -20 -60 16 55 -62 53 8 -59 29 26 -63 42 33 46 0 0 -61 20 46 20 15 4 14 55 -20 -60 2 54 -62 39 50 -59 15 12 -63 29 30 47 0 0 -61 6 40 20 15 2 15 54 -20 -59 48 27 -62 26 6 -59 0 32 -63 16 1 48 0 0 -60 52 8 20 14 59 15 54 -21 -59 33 33 -62 11 57 -58 45 24 -63 2 7 49 0 0 -60 37 9 20 14 57 16 53 -21 -59 18 12 -61 57 21 -58 29 50 -62 47 46 50 0 0 -60 21 43 20 14 54 16 52 -21 -59 2 24 -61 42 19 -58 13 49 -62 32 59 51 0 0 -60 5 49 20 14 51 17 51 -21 -58 46 8 -61 26 49 -57 57 19 -62 17 45 52 0 0 -59 49 28 20 14 48 17 50 -22 -58 29 23 -61 10 52 -57 40 22 -62 2 3 53 0 0 -59 32 39 20 14 44 18 49 -22 -58 12 11 -60 54 27 -57 22 55 -61 45 53 54 0 0 -59 15 20 20 14 41 18 48 -22 -57 54 29 -60 37 33 -57 5 0 -61 29 15 55 0 0 -58 57 33 20 14 38 19 47 -23 -57 36 19 -60 20 10 -56 46 36 -61 12 8 56 0 0 -58 39 16 20 14 34 20 46 -23 -57 17 39 -60 2 18 -56 27 42 -60 54 32 57 0 0 -58 20 29 20 14 30 20 46 -23 -56 58 28 -59 43 56 -56 8 17 -60 36 26 58 0 0 -58 1 12 20 14 26 21 45 -23 -56 38 48 -59 25 4 -55 48 23 -60 17 50 59 0 0 -57 41 24 20 14 22 21 44 -24 -56 18 37 -59 5 41 -55 27 58 -59 58 44 60 0 0 -57 21 6 20 14 18 22 43 -24 -55 57 54 -58 45 47 -55 7 2 -59 39 6 61 0 0 -57 0 16 20 14 13 23 42 -24 -55 36 41 -58 25 22 -54 45 35 -59 18 57 62 0 0 -56 38 54 20 14 8 23 41 -25 -55 14 56 -58 4 24 -54 23 36 -58 58 16 63 0 0 -56 17 0 20 14 3 24 40 -25 -54 52 39 -57 42 55 -54 1 5 -58 37 3 64 0 0 -55 54 34 20 13 58 24 39 -25 -54 29 50 -57 20 53 -53 38 3 -58 15 17 65 0 0 -55 31 35 20 13 53 25 38 -25 -54 6 29 -56 58 19 -53 14 28 -57 52 58 66 0 0 -55 8 4 20 13 48 26 38 -26 -53 42 35 -56 35 11 -52 50 21 -57 30 6 67 0 0 -54 43 59 20 13 42 26 37 -26 -53 18 9 -56 11 30 -52 25 42 -57 6 40 68 0 0 -54 19 22 20 13 36 27 36 -26 -52 53 9 -55 47 16 -52 0 29 -56 42 41 69 0 0 -53 54 10 20 13 30 28 35 -26 -52 27 37 -55 22 27 -51 34 44 -56 18 7 70 0 0 -53 28 26 20 13 24 28 34 -26 -52 1 31 -54 57 5 -51 8 26 -55 52 59 71 0 0 -53 2 7 20 13 17 29 33 -27 -51 34 52 -54 31 8 -50 41 36 -55 27 17 72 0 0 -52 35 15 20 13 10 30 32 -27 -51 7 40 -54 4 37 -50 14 12 -55 1 0 73 0 0 -52 7 49 20 13 3 31 31 -27 -50 39 55 -53 37 32 -49 46 16 -54 34 8 74 0 0 -51 39 50 20 12 56 31 30 -27 -50 11 37 -53 9 52 -49 17 47 -54 6 42 75 0 0 -51 11 17 20 12 48 32 29 -28 -49 42 46 -52 41 38 -48 48 46 -53 38 41 76 0 0 -50 42 10 20 12 40 33 28 -28 -49 13 23 -52 12 50 -48 19 12 -53 10 5 77 0 0 -50 12 30 20 12 32 33 27 -28 -48 43 26 -51 43 28 -47 49 6 -52 40 54 78 0 0 -49 42 17 20 12 24 34 27 -28 -48 12 58 -51 13 32 -47 18 28 -52 11 9 79 0 0 -49 11 31 20 12 15 35 26 -28 -47 41 57 -50 43 2 -46 47 18 -51 40 49 80 0 0 -48 40 13 20 12 7 36 25 -28 -47 10 24 -50 11 58 -46 15 38 -51 9 56 81 0 0 -48 8 22 20 11 57 36 24 -28 -46 38 21 -49 40 22 -45 43 27 -50 38 28 82 0 0 -47 36 0 20 11 48 37 23 -29 -46 5 46 -49 8 12 -45 10 45 -50 6 28 83 0 0 -47 3 6 20 11 38 38 22 -29 -45 32 42 -48 35 31 -44 37 34 -49 33 54 84 0 0 -46 29 42 20 11 28 39 21 -29 -44 59 7 -48 2 17 -44 3 54 -49 0 48 85 0 0 -45 55 47 20 11 18 39 19 -29 -44 25 4 -47 28 33 -43 29 45 -48 27 10 86 0 0 -45 21 24 20 11 8 40 18 -29 -43 50 32 -46 54 18 -42 55 8 -47 53 0 87 0 0 -44 46 31 20 10 57 41 17 -29 -43 15 33 -46 19 33 -42 20 5 -47 18 20 88 0 0 -44 11 11 20 10 46 42 16 -29 -42 40 6 -45 44 19 -41 44 35 -46 43 11 89 0 0 -43 35 23 20 10 34 42 15 -29 -42 4 14 -45 8 36 -41 8 40 -46 7 32 90 0 0 -42 59 9 20 10 22 43 14 -29 -41 27 56 -44 32 26 -40 32 20 -45 31 25 91 0 0 -42 22 30 20 10 10 44 13 -29 -40 51 15 -43 55 50 -39 55 37 -44 54 50 92 0 0 -41 45 27 20 9 58 45 12 -29 -40 14 10 -43 18 49 -39 18 32 -44 17 50 93 0 0 -41 8 0 20 9 46 45 10 -29 -39 36 43 -42 41 22 -38 41 4 -43 40 24 94 0 0 -40 30 12 20 9 33 46 9 -29 -38 58 55 -42 3 33 -38 3 17 -43 2 34 95 0 0 -39 52 2 20 9 20 47 8 -29 -38 20 47 -41 25 21 -37 25 10 -42 24 21 96 0 0 -39 13 32 20 9 6 48 7 -29 -37 42 20 -40 46 49 -36 46 45 -41 45 46 97 0 0 -38 34 44 20 8 53 48 5 -28 -37 3 36 -40 7 56 -36 8 3 -41 6 51 98 0 0 -37 55 38 20 8 39 49 4 -28 -36 24 35 -39 28 45 -35 29 5 -40 27 37 99 0 0 -37 16 17 20 8 25 50 3 -28 -35 45 19 -38 49 17 -34 49 53 -39 48 4 100 0 0 -36 36 40 20 8 10 50 1 -28 -35 5 50 -38 9 33 -34 10 27 -39 8 15 101 0 0 -35 56 50 20 7 56 51 360 -28 -34 26 8 -37 29 34 -33 30 50 -38 28 11 102 0 0 -35 16 48 20 7 41 52 358 -27 -33 46 15 -36 49 22 -32 51 2 -37 47 52 103 0 0 -34 36 35 20 7 26 52 357 -27 -33 6 12 -36 8 59 -32 11 5 -37 7 22 104 0 0 -33 56 13 20 7 11 53 355 -27 -32 26 0 -35 28 25 -31 31 0 -36 26 41 105 0 0 -33 15 43 20 6 55 54 353 -27 -31 45 42 -34 47 42 -30 50 48 -35 45 50 106 0 0 -32 35 6 20 6 39 54 352 -26 -31 5 18 -34 6 52 -30 10 31 -35 4 51 107 0 0 -31 54 24 20 6 24 55 350 -26 -30 24 49 -33 25 56 -29 30 10 -34 23 46 108 0 0 -31 13 39 20 6 8 55 348 -26 -29 44 18 -32 44 56 -28 49 47 -33 42 35 109 0 0 -30 32 51 20 5 51 56 346 -25 -29 3 45 -32 3 53 -28 9 23 -33 1 22 110 0 0 -29 52 3 20 5 35 56 344 -25 -28 23 12 -31 22 48 -27 28 59 -32 20 6 111 0 0 -29 11 15 20 5 18 57 342 -24 -27 42 40 -30 41 43 -26 48 37 -31 38 50 112 0 0 -28 30 30 20 5 2 57 340 -24 -27 2 11 -30 0 39 -26 8 17 -30 57 34 113 0 0 -27 49 47 20 4 45 57 338 -23 -26 21 46 -29 19 39 -25 28 2 -30 16 21 114 0 0 -27 9 10 20 4 28 58 336 -23 -25 41 26 -28 38 42 -24 47 52 -29 35 13 115 0 0 -26 28 38 20 4 11 58 334 -23 -25 1 12 -27 57 51 -24 7 50 -28 54 9 116 0 0 -25 48 14 20 3 54 58 332 -22 -24 21 7 -27 17 7 -23 27 55 -28 13 12 117 0 0 -25 7 59 20 3 37 58 330 -21 -23 41 11 -26 36 32 -22 48 10 -27 32 23 118 0 0 -24 27 54 20 3 20 58 328 -21 -23 1 25 -25 56 6 -22 8 35 -26 51 43 119 0 0 -23 48 0 20 3 3 59 326 -20 -22 21 51 -25 15 51 -21 29 13 -26 11 15 120 0 0 -23 8 18 20 2 46 59 324 -20 -21 42 29 -24 35 48 -20 50 3 -25 30 58 121 0 0 -22 28 51 20 2 28 59 322 -19 -21 3 22 -23 55 59 -20 11 8 -24 50 55 122 0 0 -21 49 38 20 2 11 59 320 -19 -20 24 30 -23 16 25 -19 32 27 -24 11 6 123 0 0 -21 10 42 20 1 54 58 317 -18 -19 45 54 -22 37 6 -18 54 4 -23 31 33 124 0 0 -20 32 2 20 1 37 58 315 -17 -19 7 35 -21 58 4 -18 15 57 -22 52 17 125 0 0 -19 53 41 20 1 19 58 313 -17 -18 29 35 -21 19 21 -17 38 9 -22 13 19 126 0 0 -19 15 39 20 1 2 58 311 -16 -17 51 54 -20 40 57 -17 0 41 -21 34 40 127 0 0 -18 37 58 20 0 45 58 309 -15 -17 14 33 -20 2 53 -16 23 33 -20 56 21 128 0 0 -18 0 37 20 0 28 57 308 -15 -16 37 34 -19 25 10 -15 46 46 -20 18 24 129 0 0 -17 23 39 20 0 11 57 306 -14 -16 0 57 -18 47 50 -15 10 22 -19 40 49 130 0 0 -16 47 4 19 59 54 57 304 -13 -15 24 44 -18 10 52 -14 34 21 -19 3 37 131 0 0 -16 10 54 19 59 37 56 302 -12 -14 48 54 -17 34 19 -13 58 44 -18 26 49 132 0 0 -15 35 8 19 59 21 56 300 -12 -14 13 29 -16 58 11 -13 23 31 -17 50 26 133 0 0 -14 59 47 19 59 4 55 299 -11 -13 38 30 -16 22 28 -12 48 44 -17 14 29 134 0 0 -14 24 54 19 58 48 55 297 -10 -13 3 57 -15 47 12 -12 14 24 -16 38 59 135 0 0 -13 50 27 19 58 31 54 296 -9 -12 29 51 -15 12 24 -11 40 30 -16 3 56 136 0 0 -13 16 28 19 58 15 54 294 -9 -11 56 13 -14 38 3 -11 7 4 -15 29 21 137 0 0 -12 42 58 19 57 59 53 293 -8 -11 23 3 -14 4 11 -10 34 7 -14 55 15 138 0 0 -12 9 57 19 57 43 52 292 -7 -10 50 22 -13 30 49 -10 1 38 -14 21 39 139 0 0 -11 37 26 19 57 28 52 290 -6 -10 18 11 -12 57 56 - 9 29 39 -13 48 33 140 0 0 -11 5 25 19 57 12 51 289 -5 - 9 46 31 -12 25 35 - 8 58 10 -13 15 57 141 0 0 -10 33 55 19 56 57 50 288 -5 - 9 15 21 -11 53 44 - 8 27 12 -12 43 53 142 0 0 -10 2 57 19 56 42 50 287 -4 - 8 44 42 -11 22 25 - 7 56 45 -12 12 21 143 0 0 - 9 32 31 19 56 27 49 286 -3 - 8 14 35 -10 51 39 - 7 26 49 -11 41 22 144 0 0 - 9 2 37 19 56 12 48 285 -2 - 7 45 0 -10 21 25 - 6 57 26 -11 10 55 145 0 0 - 8 33 16 19 55 57 47 284 -1 - 7 15 58 - 9 51 45 - 6 28 35 -10 41 2 146 0 0 - 8 4 29 19 55 43 47 283 0 - 6 47 29 - 9 22 38 - 6 0 17 -10 11 43 Uncertainty in time = +/- 10 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: UCAC2 32816633 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 25 31.6160 DE: +03 02 44.737 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .041 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (532) Herculina approx. diameter [km]: 222 approx. diameter ["]: .134 distance from Earth [AU]: 2.28500 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 2449 number of rejected observations: 186 time covered by the observations: 1904 Apr 20 - 2008 Sep 30 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.008, 66° remarks: * orbital elements for (532) Herculina : Mean anomaly = 242.65780780 deg Arg. of pericenter = 76.64978315 deg Long. of node = 107.59863654 deg Inclination = 16.31403168 deg Eccentricity = 0.17819085 Semimajor axis = 2.77106973 AU Perihelion dist = 2.27729047 AU Mag: H = 5.89, G = 0.26 Epoch of elements : MJD 54753.83500000 TDT (2008 Oct 14.835) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 14 532 Herculina 20h 2.6m UT 11.9 4 25 31.616 3 2 44.74UCAC2 32816633 0.0 10.7 222 32.0 2.285 -0.836 -8.47 101.9943 3.048 -124.19 -8.51 20.0434 0.29160 -0.43111 -3.24981 -2.19954 -0.00416 0.00064 2000 241.83840420081011.00000 76.649783107.598637 16.3140320.17819085 2.7710697 2.2772905 5.8 5.00.26 RATE 2.1366470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.041 359 1.31 0.041 0 54740.5020081014_816633 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org