IOTA/IOTA-ES occultation update for (392) Wilhelmina / TYC 0740-00696-1 event on 2012 Sep 26, 06:29 UT Visible from E Canada Summary ------- On 2012 Sep 26 UT, the 59 km diameter asteroid (392) Wilhelmina will occult a 11.5 mag star in the constellation Gemini for observers along a path across E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.8 mag (the magnitude of the asteroid) for at most 3.0 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: 43 * date and approx. time of event: 2012 Sep 26, 06:25 - 2012 Sep 26, 06:28 UT * geocentric midpoint of event [JD]: 2456196.7707375 * magnitude of target star: 11.5 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 3.0 * Moon: 85 % sunlit, 139° distance * Sun: 86° distance * rough path description: E Canada The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 1.53 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .041", 0° ) * approx speed of asteroid's shadow [km/s]: 19.8773 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0740-00696-1 by 392 Wilhelmina on 2012 Sep 26 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 -110 0 0 51 25 15 6 25 9 0 70 -39 51 6 4 51 44 30 .. .. .. 52 43 48 -109 0 0 51 38 49 6 25 9 1 71 -39 51 19 41 51 58 1 .. .. .. 52 57 9 -108 0 0 51 52 0 6 25 9 2 72 -39 51 32 55 52 11 9 .. .. .. 53 10 7 -107 0 0 52 4 49 6 25 9 2 72 -39 51 45 47 52 23 54 .. .. .. 53 22 42 -106 0 0 52 17 14 6 25 9 3 73 -39 51 58 15 52 36 17 .. .. .. 53 34 55 -105 0 0 52 29 17 6 25 10 4 74 -39 52 10 21 52 48 17 .. .. .. 53 46 45 -104 0 0 52 40 58 6 25 10 4 75 -39 52 22 5 52 59 54 51 24 39 53 58 13 -103 0 0 52 52 16 6 25 10 5 76 -38 52 33 26 53 11 10 51 36 9 54 9 20 -102 0 0 53 3 13 6 25 10 6 76 -38 52 44 26 53 22 3 51 47 17 54 20 4 -101 0 0 53 13 47 6 25 11 6 77 -38 52 55 3 53 32 35 51 58 2 54 30 27 -100 0 0 53 24 0 6 25 11 7 78 -38 53 5 19 53 42 45 52 8 26 54 40 29 - 99 0 0 53 33 52 6 25 12 7 79 -38 53 15 13 53 52 34 52 18 28 54 50 9 - 98 0 0 53 43 21 6 25 12 8 80 -38 53 24 45 54 2 1 52 28 8 54 59 28 - 97 0 0 53 52 30 6 25 13 9 80 -38 53 33 56 54 11 7 52 37 27 55 8 26 - 96 0 0 54 1 17 6 25 14 9 81 -37 53 42 46 54 19 52 52 46 24 55 17 4 - 95 0 0 54 9 44 6 25 14 10 82 -37 53 51 15 54 28 16 52 55 0 55 25 21 - 94 0 0 54 17 50 6 25 15 10 83 -37 53 59 23 54 36 20 53 3 15 55 33 17 - 93 0 0 54 25 35 6 25 16 11 84 -37 54 7 10 54 44 2 53 11 9 55 40 52 - 92 0 0 54 32 59 6 25 16 12 85 -37 54 14 36 54 51 25 53 18 41 55 48 8 - 91 0 0 54 40 3 6 25 17 12 85 -36 54 21 42 54 58 27 53 25 54 55 55 4 - 90 0 0 54 46 47 6 25 18 13 86 -36 54 28 28 55 5 8 53 32 45 56 1 39 - 89 0 0 54 53 10 6 25 19 13 87 -36 54 34 53 55 11 30 53 39 16 56 7 55 - 88 0 0 54 59 14 6 25 20 14 88 -36 54 40 59 55 17 32 53 45 27 56 13 51 - 87 0 0 55 4 57 6 25 21 15 89 -36 54 46 44 55 23 13 53 51 17 56 19 27 - 86 0 0 55 10 21 6 25 21 15 90 -35 54 52 9 55 28 35 53 56 48 56 24 44 - 85 0 0 55 15 25 6 25 22 16 90 -35 54 57 15 55 33 38 54 1 58 56 29 42 - 84 0 0 55 20 9 6 25 23 16 91 -35 55 2 1 55 38 21 54 6 48 56 34 20 - 83 0 0 55 24 34 6 25 25 17 92 -35 55 6 27 55 42 44 54 11 18 56 38 39 - 82 0 0 55 28 39 6 25 26 17 93 -34 55 10 33 55 46 48 54 15 28 56 42 39 - 81 0 0 55 32 25 6 25 27 18 94 -34 55 14 20 55 50 33 54 19 19 56 46 21 - 80 0 0 55 35 52 6 25 28 19 95 -34 55 17 48 55 53 58 54 22 50 56 49 43 - 79 0 0 55 38 59 6 25 29 19 96 -34 55 20 56 55 57 5 54 26 1 56 52 46 - 78 0 0 55 41 47 6 25 30 20 96 -33 55 23 45 55 59 52 54 28 53 56 55 30 - 77 0 0 55 44 16 6 25 31 20 97 -33 55 26 15 56 2 20 54 31 25 56 57 56 - 76 0 0 55 46 26 6 25 33 21 98 -33 55 28 26 56 4 29 54 33 38 57 0 3 - 75 0 0 55 48 17 6 25 34 21 99 -32 55 30 17 56 6 19 54 35 31 57 1 51 - 74 0 0 55 49 48 6 25 35 22 100 -32 55 31 49 56 7 51 54 37 5 57 3 21 - 73 0 0 55 51 1 6 25 37 22 101 -32 55 33 2 56 9 3 54 38 19 57 4 32 - 72 0 0 55 51 55 6 25 38 23 102 -32 55 33 57 56 9 56 54 39 14 57 5 24 - 71 0 0 55 52 30 6 25 39 24 103 -31 55 34 32 56 10 31 54 39 50 57 5 58 - 70 0 0 55 52 46 6 25 41 24 103 -31 55 34 48 56 10 47 54 40 6 57 6 13 - 69 0 0 55 52 42 6 25 42 25 104 -31 55 34 44 56 10 43 54 40 3 57 6 10 - 68 0 0 55 52 20 6 25 44 25 105 -30 55 34 22 56 10 21 54 39 41 57 5 48 - 67 0 0 55 51 39 6 25 45 26 106 -30 55 33 41 56 9 40 54 38 59 57 5 8 - 66 0 0 55 50 39 6 25 47 26 107 -30 55 32 41 56 8 41 54 37 58 57 4 9 - 65 0 0 55 49 20 6 25 49 27 108 -29 55 31 21 56 7 22 54 36 38 57 2 51 - 64 0 0 55 47 42 6 25 50 27 109 -29 55 29 42 56 5 44 54 34 58 57 1 14 - 63 0 0 55 45 44 6 25 52 28 110 -29 55 27 45 56 3 47 54 32 58 56 59 19 - 62 0 0 55 43 28 6 25 54 28 111 -28 55 25 27 56 1 31 54 30 39 56 57 5 - 61 0 0 55 40 52 6 25 55 29 112 -28 55 22 51 55 58 56 54 28 0 56 54 33 - 60 0 0 55 37 57 6 25 57 30 112 -28 55 19 55 55 56 2 54 25 2 56 51 41 - 59 0 0 55 34 42 6 25 59 30 113 -27 55 16 40 55 52 48 54 21 44 56 48 30 - 58 0 0 55 31 9 6 26 1 31 114 -27 55 13 5 55 49 16 54 18 6 56 45 1 - 57 0 0 55 27 15 6 26 3 31 115 -26 55 9 10 55 45 23 54 14 8 56 41 12 - 56 0 0 55 23 2 6 26 5 32 116 -26 55 4 56 55 41 11 54 9 50 56 37 4 - 55 0 0 55 18 29 6 26 7 32 117 -26 55 0 22 55 36 40 54 5 12 56 32 36 - 54 0 0 55 13 37 6 26 9 33 118 -25 54 55 28 55 31 49 54 0 14 56 27 50 - 53 0 0 55 8 24 6 26 11 33 119 -25 54 50 14 55 26 38 53 54 56 56 22 43 - 52 0 0 55 2 52 6 26 13 34 120 -24 54 44 40 55 21 7 53 49 17 56 17 17 - 51 0 0 54 56 59 6 26 15 34 121 -24 54 38 45 55 15 16 53 43 17 56 11 31 - 50 0 0 54 50 46 6 26 17 35 122 -24 54 32 31 55 9 4 53 36 57 56 5 26 - 49 0 0 54 44 13 6 26 19 36 123 -23 54 25 55 55 2 33 53 30 16 55 59 0 - 48 0 0 54 37 19 6 26 21 36 124 -23 54 18 59 54 55 41 53 23 15 55 52 14 - 47 0 0 54 30 4 6 26 23 37 125 -22 54 11 43 54 48 28 53 15 52 55 45 7 - 46 0 0 54 22 28 6 26 26 37 126 -22 54 4 5 54 40 55 53 8 8 55 37 41 - 45 0 0 54 14 31 6 26 28 38 127 -21 53 56 6 54 33 0 53 0 2 55 29 53 - 44 0 0 54 6 14 6 26 30 38 128 -21 53 47 46 54 24 45 52 51 35 55 21 45 - 43 0 0 53 57 34 6 26 33 39 129 -21 53 39 4 54 16 8 52 42 47 55 13 15 - 42 0 0 53 48 34 6 26 35 39 130 -20 53 30 1 54 7 9 52 33 36 55 4 24 - 41 0 0 53 39 11 6 26 38 40 131 -20 53 20 36 53 57 50 52 24 4 54 55 12 - 40 0 0 53 29 27 6 26 40 41 132 -19 53 10 49 53 48 8 52 14 9 54 45 39 - 39 0 0 53 19 20 6 26 43 41 133 -19 53 0 40 53 38 4 52 3 52 54 35 44 - 38 0 0 53 8 52 6 26 46 42 134 -18 52 50 9 53 27 38 51 53 12 54 25 26 - 37 0 0 52 58 1 6 26 48 42 135 -18 52 39 15 53 16 50 51 42 9 54 14 47 - 36 0 0 52 46 47 6 26 51 43 136 -17 52 27 58 53 5 39 51 30 44 54 3 45 - 35 0 0 52 35 10 6 26 54 43 137 -17 52 16 18 52 54 5 51 18 56 53 52 21 - 34 0 0 52 23 11 6 26 57 44 139 -16 52 4 16 52 42 9 51 6 44 53 40 34 - 33 0 0 52 10 48 6 27 0 44 140 -16 51 51 50 52 29 49 50 54 8 53 28 24 - 32 0 0 51 58 1 6 27 3 45 141 -15 51 39 0 52 17 6 50 41 9 53 15 51 - 31 0 0 51 44 51 6 27 5 46 142 -15 51 25 47 52 3 59 50 27 47 53 2 54 - 30 0 0 51 31 18 6 27 9 46 143 -14 51 12 10 51 50 29 50 14 0 52 49 34 - 29 0 0 51 17 20 6 27 12 47 144 -14 50 58 9 51 36 34 49 59 49 52 35 50 - 28 0 0 51 2 58 6 27 15 47 146 -13 50 43 44 51 22 16 49 45 13 52 21 42 - 27 0 0 50 48 11 6 27 18 48 147 -12 50 28 54 51 7 33 49 30 13 52 7 10 - 26 0 0 50 33 0 6 27 21 48 148 -12 50 13 39 50 52 25 49 14 48 51 52 13 - 25 0 0 50 17 25 6 27 25 49 149 -11 49 58 0 50 36 53 48 58 58 51 36 52 - 24 0 0 50 1 24 6 27 28 50 151 -11 49 41 55 50 20 56 48 42 43 51 21 6 - 23 0 0 49 44 58 6 27 31 50 152 -10 49 25 26 50 4 33 48 26 3 51 4 55 - 22 0 0 49 28 7 6 27 35 51 153 -9 49 8 31 49 47 46 48 8 57 50 48 18 - 21 0 0 49 10 50 6 27 38 51 155 -9 48 51 11 49 30 33 47 51 26 50 31 17 - 20 0 0 48 53 7 6 27 42 52 156 -8 48 33 25 49 12 54 47 33 29 50 13 50 - 19 0 0 48 34 59 6 27 46 52 157 -8 48 15 13 48 54 50 47 15 6 49 55 57 - 18 0 0 48 16 25 6 27 49 53 159 -7 47 56 35 48 36 19 46 56 17 49 37 38 - 17 0 0 47 57 25 6 27 53 53 160 -6 47 37 31 48 17 23 46 37 2 49 18 53 - 16 0 0 47 37 59 6 27 57 54 162 -6 47 18 1 47 58 0 46 17 21 48 59 43 - 15 0 0 47 18 7 6 28 1 54 163 -5 46 58 5 47 38 12 45 57 14 48 40 6 - 14 0 0 46 57 48 6 28 5 55 165 -4 46 37 43 47 17 57 45 36 40 48 20 2 - 13 0 0 46 37 3 6 28 9 55 166 -4 46 16 54 46 57 15 45 15 40 47 59 32 - 12 0 0 46 15 51 6 28 13 56 168 -3 45 55 39 46 36 8 44 54 14 47 38 36 - 11 0 0 45 54 13 6 28 17 56 170 -2 45 33 57 46 14 33 44 32 22 47 17 13 - 10 0 0 45 32 9 6 28 22 57 171 -2 45 11 49 45 52 33 44 10 3 46 55 24 - 9 0 0 45 9 38 6 28 26 57 173 -1 44 49 15 45 30 5 43 47 18 46 33 8 - 8 0 0 44 46 41 6 28 30 58 175 0 44 26 14 45 7 12 43 24 7 46 10 26 Uncertainty in time = +/- 5 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: TYC 0740-00696-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 28 32.7293 DE: +12 36 32.505 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .051 ) * V mag [mag]: 11.5 * B mag [mag]: 12.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (392) Wilhelmina approx. diameter [km]: 59 approx. diameter ["]: .033 distance from Earth [AU]: 2.45500 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1006 number of rejected observations: 60 time covered by the observations: 1933 Oct 23 - 2012 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.011, 100° remarks: * orbital elements for (392) Wilhelmina : Mean anomaly = 38.57030313 deg Arg. of pericenter = 174.81733522 deg Long. of node = 209.87593035 deg Inclination = 14.32546192 deg Eccentricity = 0.14168864 Semimajor axis = 2.88540394 AU Perihelion dist = 2.47657497 AU Mag: H = 9.71, G = 0.15 Epoch of elements : MJD 56196.27100000 TDT (2012 Sep 26.271) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 26 392 Wilhelmina 6h 29.9m UT 11.5 6 28 32.729 12 36 32.50TYC 0740-00696-1 12.5 14.8 59 3.0 2.455 2.484 -17.09 -5.7998 12.614 80.35 -1.42 6.4977 0.19616 0.42097 10.15437 -4.77096 -0.00561 0.00022 2000 37.3092572012 920.00000174.817335209.875930 14.3254620.14168864 2.8854039 2.4765750 9.7 5.00.15 RATE 2.0109170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.041 0 2.53 0.051 0 0 3 5 056146.0020120926_0696-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 21:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org