IOTA/IOTA-ES occultation update for (233) Asterope / TYC 5528-01463-1 event on 2012 Nov 25, 09:32 UT Visible from SE Canada Summary ------- On 2012 Nov 25 UT, the 93 km diameter asteroid (233) Asterope will occult a 9.3 mag star in the constellation Virgo for observers along a path across SE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 14.1 mag (the magnitude of the asteroid) for at most 2.6 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: UCAC. The event at a glimpse ---------------------- * Rank: 81 * date and approx. time of event: 2012 Nov 25, 09:30 - 2012 Nov 25, 09:31 UT * geocentric midpoint of event [JD]: 2456256.89775 * magnitude of target star: 9.3 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 2.6 * Moon: 91 % sunlit, 166° distance * Sun: 50° distance * rough path description: SE Canada The occultation path -------------------- * approximate projected width [km]: 111 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .023", 92° ) * approx speed of asteroid's shadow [km/s]: 35.1796 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5528-01463-1 by 233 Asterope on 2012 Nov 25 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 - 92 0 0 55 7 4 9 30 15 0 107 -37 54 35 46 55 38 33 53 54 44 .. .. .. - 91 0 0 54 56 20 9 30 15 1 108 -37 54 24 58 55 27 54 53 43 51 56 9 53 - 90 0 0 54 45 17 9 30 15 1 109 -36 54 13 51 55 16 56 53 32 38 55 59 1 - 89 0 0 54 33 55 9 30 15 2 110 -36 54 2 24 55 5 38 53 21 5 55 47 49 - 88 0 0 54 22 12 9 30 15 3 110 -35 53 50 36 54 53 59 53 9 12 55 36 17 - 87 0 0 54 10 9 9 30 15 3 111 -35 53 38 29 54 42 1 52 56 59 55 24 25 - 86 0 0 53 57 46 9 30 15 4 112 -34 53 26 1 54 29 43 52 44 25 55 12 13 - 85 0 0 53 45 2 9 30 15 5 113 -34 53 13 13 54 17 4 52 31 31 54 59 40 - 84 0 0 53 31 58 9 30 16 5 114 -33 53 0 4 54 4 5 52 18 16 54 46 47 - 83 0 0 53 18 33 9 30 16 6 114 -33 52 46 34 53 50 45 52 4 40 54 33 34 - 82 0 0 53 4 48 9 30 16 7 115 -32 52 32 44 53 37 4 51 50 43 54 20 0 - 81 0 0 52 50 41 9 30 16 7 116 -32 52 18 32 53 23 2 51 36 26 54 6 5 - 80 0 0 52 36 14 9 30 17 8 117 -31 52 4 0 53 8 40 51 21 47 53 51 49 - 79 0 0 52 21 25 9 30 17 8 118 -30 51 49 7 52 53 56 51 6 47 53 37 13 - 78 0 0 52 6 15 9 30 17 9 118 -30 51 33 52 52 38 51 50 51 26 53 22 15 - 77 0 0 51 50 44 9 30 18 10 119 -29 51 18 16 52 23 25 50 35 43 53 6 55 - 76 0 0 51 34 51 9 30 18 10 120 -29 51 2 18 52 7 38 50 19 39 52 51 15 - 75 0 0 51 18 37 9 30 19 11 121 -28 50 45 59 51 51 29 50 3 14 52 35 13 - 74 0 0 51 2 2 9 30 19 12 122 -27 50 29 19 51 34 58 49 46 27 52 18 49 - 73 0 0 50 45 5 9 30 20 13 122 -27 50 12 16 51 18 6 49 29 18 52 2 4 - 72 0 0 50 27 46 9 30 20 13 123 -26 49 54 53 51 0 53 49 11 48 51 44 57 - 71 0 0 50 10 5 9 30 21 14 124 -25 49 37 7 50 43 17 48 53 57 51 27 28 - 70 0 0 49 52 3 9 30 22 15 125 -25 49 19 0 50 25 20 48 35 43 51 9 38 - 69 0 0 49 33 39 9 30 22 15 126 -24 49 0 32 50 7 1 48 17 8 50 51 25 - 68 0 0 49 14 54 9 30 23 16 126 -23 48 41 41 49 48 20 47 58 12 50 32 51 - 67 0 0 48 55 46 9 30 24 17 127 -23 48 22 29 49 29 18 47 38 54 50 13 55 - 66 0 0 48 36 18 9 30 25 17 128 -22 48 2 56 49 9 54 47 19 14 49 54 38 - 65 0 0 48 16 27 9 30 26 18 129 -21 47 43 0 48 50 8 46 59 13 49 34 58 - 64 0 0 47 56 15 9 30 26 19 130 -21 47 22 44 48 30 1 46 38 50 49 14 57 - 63 0 0 47 35 42 9 30 27 20 130 -20 47 2 6 48 9 32 46 18 7 48 54 34 - 62 0 0 47 14 47 9 30 28 20 131 -19 46 41 7 47 48 41 45 57 2 48 33 50 - 61 0 0 46 53 31 9 30 29 21 132 -18 46 19 47 47 27 30 45 35 36 48 12 44 - 60 0 0 46 31 54 9 30 31 22 133 -18 45 58 6 47 5 57 45 13 50 47 51 17 - 59 0 0 46 9 56 9 30 32 23 134 -17 45 36 4 46 44 3 44 51 43 47 29 29 - 58 0 0 45 47 38 9 30 33 23 135 -16 45 13 41 46 21 49 44 29 15 47 7 20 - 57 0 0 45 24 59 9 30 34 24 135 -15 44 50 58 45 59 14 44 6 27 46 44 50 - 56 0 0 45 1 59 9 30 35 25 136 -15 44 27 55 45 36 18 43 43 20 46 22 0 - 55 0 0 44 38 40 9 30 37 26 137 -14 44 4 33 45 13 3 43 19 52 45 58 49 - 54 0 0 44 15 1 9 30 38 26 138 -13 43 40 51 44 49 27 42 56 6 45 35 19 - 53 0 0 43 51 3 9 30 39 27 139 -12 43 16 49 44 25 32 42 32 0 45 11 28 - 52 0 0 43 26 46 9 30 41 28 139 -11 42 52 29 44 1 18 42 7 36 44 47 19 - 51 0 0 43 2 10 9 30 42 29 140 -11 42 27 50 43 36 46 41 42 53 44 22 50 - 50 0 0 42 37 16 9 30 44 30 141 -10 42 2 53 43 11 54 41 17 53 43 58 2 - 49 0 0 42 12 4 9 30 46 30 142 -9 41 37 39 42 46 45 40 52 35 43 32 57 - 48 0 0 41 46 35 9 30 47 31 143 -8 41 12 7 42 21 18 40 27 0 43 7 33 - 47 0 0 41 20 49 9 30 49 32 144 -7 40 46 19 41 55 34 40 1 9 42 41 52 - 46 0 0 40 54 46 9 30 51 33 145 -6 40 20 14 41 29 34 39 35 2 42 15 54 - 45 0 0 40 28 27 9 30 53 34 146 -5 39 53 54 41 3 17 39 8 39 41 49 40 - 44 0 0 40 1 54 9 30 54 34 147 -5 39 27 18 40 36 45 38 42 2 41 23 10 - 43 0 0 39 35 5 9 30 56 35 147 -4 39 0 28 40 9 58 38 15 10 40 56 25 - 42 0 0 39 8 2 9 30 58 36 148 -3 38 33 24 39 42 56 37 48 4 40 29 25 - 41 0 0 38 40 46 9 31 0 37 149 -2 38 6 7 39 15 41 37 20 46 40 2 12 - 40 0 0 38 13 17 9 31 2 38 150 -1 37 38 37 38 48 13 36 53 15 39 34 44 - 39 0 0 37 45 36 9 31 5 38 151 0 37 10 55 38 20 32 36 25 32 39 7 4 Uncertainty in time = +/- 2 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 5528-01463-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 42 54.4302 DE: -09 28 49.862 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .022 ) * V mag [mag]: 9.3 * B mag [mag]: 10.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (233) Asterope approx. diameter [km]: 93 approx. diameter ["]: .037 distance from Earth [AU]: 3.46000 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1173 number of rejected observations: 104 time covered by the observations: 1910 Aug 18 - 2012 Mar 30 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.007, 106° remarks: * orbital elements for (233) Asterope : Mean anomaly = 193.32033407 deg Arg. of pericenter = 125.33484964 deg Long. of node = 222.03601164 deg Inclination = 7.68380997 deg Eccentricity = 0.10131859 Semimajor axis = 2.65946252 AU Perihelion dist = 2.39000954 AU Mag: H = 8.26, G = 0.15 Epoch of elements : MJD 56256.39800000 TDT (2012 Nov 25.398) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 25 233 Asterope 9h 32.8m UT 9.3 12 42 54.430- 9 28 49.86TYC 5528-01463-1 10.2 14.1 93 2.6 3.460 3.143 -19.62 -17.1969 -9.475 33.59 -20.86 9.5460 0.21168 0.50549 18.29497 -7.71814 -0.00429 0.00150 2000 191.86635720121119.00000125.334850222.036012 7.6838100.10131859 2.6594625 2.3900095 8.2 5.00.15 RATE 2.2725490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.023 92 1.66 0.024 0 0 2-2 056247.0020121125_1463-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 03:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org