IOTA/IOTA-ES occultation update for (218) Bianca / TYC 0746-01510-1 event on 2012 Sep 24, 23:50 UT Visible from Russia Summary ------- On 2012 Sep 24 UT, the 61 km diameter asteroid (218) Bianca will occult a 11.3 mag star in the constellation Monoceros for observers along a path across Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.0 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: 64 * date and approx. time of event: 2012 Sep 24, 23:46 - 2012 Sep 24, 23:48 UT * geocentric midpoint of event [JD]: 2456195.49325417 * magnitude of target star: 11.3 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 3.0 * Moon: 73 % sunlit, 158° distance * Sun: 82° distance * rough path description: Russia The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.94 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .027", 90° ) * approx speed of asteroid's shadow [km/s]: 20.3150 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0746-01510-1 by 218 Bianca on 2012 Sep 24 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 - 3 0 0 59 1 25 23 46 9 0 76 -32 58 40 2 59 22 54 .. .. .. 60 3 36 - 2 0 0 59 9 21 23 46 9 1 77 -32 58 48 1 59 30 48 .. .. .. 60 11 24 - 1 0 0 59 17 0 23 46 10 1 77 -32 58 55 43 59 38 24 .. .. .. 60 18 56 0 0 0 59 24 22 23 46 10 2 78 -32 59 3 7 59 45 44 .. .. .. 60 26 10 1 0 0 59 31 27 23 46 10 2 79 -31 59 10 14 59 52 46 .. .. .. 60 33 8 2 0 0 59 38 15 23 46 10 3 80 -31 59 17 5 59 59 32 58 37 32 60 39 49 3 0 0 59 44 46 23 46 10 4 81 -31 59 23 38 60 6 1 58 44 10 60 46 13 4 0 0 59 51 1 23 46 10 4 82 -31 59 29 55 60 12 13 58 50 31 60 52 21 5 0 0 59 56 59 23 46 11 5 83 -31 59 35 55 60 18 9 58 56 35 60 58 12 6 0 0 60 2 40 23 46 11 5 83 -31 59 41 38 60 23 48 59 2 22 61 3 48 7 0 0 60 8 5 23 46 11 6 84 -31 59 47 5 60 29 11 59 7 52 61 9 7 8 0 0 60 13 13 23 46 12 6 85 -31 59 52 16 60 34 17 59 13 6 61 14 9 9 0 0 60 18 6 23 46 12 7 86 -30 59 57 10 60 39 8 59 18 4 61 18 56 10 0 0 60 22 42 23 46 12 7 87 -30 60 1 47 60 43 42 59 22 45 61 23 27 11 0 0 60 27 2 23 46 13 8 88 -30 60 6 9 60 48 0 59 27 9 61 27 42 12 0 0 60 31 6 23 46 13 8 89 -30 60 10 15 60 52 3 59 31 18 61 31 42 13 0 0 60 34 54 23 46 14 9 90 -30 60 14 4 60 55 49 59 35 10 61 35 25 14 0 0 60 38 26 23 46 14 9 90 -30 60 17 37 60 59 20 59 38 46 61 38 54 15 0 0 60 41 42 23 46 15 10 91 -29 60 20 55 61 2 35 59 42 6 61 42 6 16 0 0 60 44 43 23 46 16 10 92 -29 60 23 57 61 5 34 59 45 10 61 45 3 17 0 0 60 47 27 23 46 16 11 93 -29 60 26 43 61 8 18 59 47 58 61 47 45 18 0 0 60 49 57 23 46 17 11 94 -29 60 29 13 61 10 46 59 50 30 61 50 11 19 0 0 60 52 10 23 46 17 11 95 -29 60 31 27 61 12 59 59 52 46 61 52 22 20 0 0 60 54 8 23 46 18 12 96 -28 60 33 26 61 14 56 59 54 46 61 54 17 21 0 0 60 55 51 23 46 19 12 97 -28 60 35 9 61 16 37 59 56 31 61 55 58 22 0 0 60 57 17 23 46 20 13 98 -28 60 36 37 61 18 4 59 57 59 61 57 23 23 0 0 60 58 29 23 46 20 13 98 -28 60 37 49 61 19 15 59 59 12 61 58 33 24 0 0 60 59 25 23 46 21 14 99 -28 60 38 45 61 20 10 60 0 9 61 59 27 25 0 0 61 0 5 23 46 22 14 100 -27 60 39 26 61 20 50 60 0 51 62 0 7 26 0 0 61 0 30 23 46 23 15 101 -27 60 39 51 61 21 15 60 1 16 62 0 31 27 0 0 61 0 40 23 46 24 15 102 -27 60 40 1 61 21 24 60 1 26 62 0 40 28 0 0 61 0 34 23 46 25 16 103 -27 60 39 55 61 21 18 60 1 20 62 0 34 29 0 0 61 0 12 23 46 26 16 104 -26 60 39 33 61 20 57 60 0 59 62 0 13 30 0 0 60 59 36 23 46 26 17 105 -26 60 38 56 61 20 20 60 0 21 61 59 37 31 0 0 60 58 43 23 46 27 17 106 -26 60 38 4 61 19 28 59 59 28 61 58 45 32 0 0 60 57 35 23 46 28 18 107 -26 60 36 56 61 18 21 59 58 20 61 57 38 33 0 0 60 56 12 23 46 30 18 107 -25 60 35 32 61 16 58 59 56 55 61 56 16 34 0 0 60 54 33 23 46 31 19 108 -25 60 33 52 61 15 20 59 55 14 61 54 39 35 0 0 60 52 38 23 46 32 19 109 -25 60 31 57 61 13 26 59 53 18 61 52 46 36 0 0 60 50 28 23 46 33 20 110 -25 60 29 46 61 11 16 59 51 5 61 50 38 37 0 0 60 48 2 23 46 34 20 111 -24 60 27 19 61 8 51 59 48 37 61 48 15 38 0 0 60 45 20 23 46 35 21 112 -24 60 24 36 61 6 10 59 45 53 61 45 36 39 0 0 60 42 23 23 46 36 21 113 -24 60 21 38 61 3 14 59 42 52 61 42 41 40 0 0 60 39 10 23 46 38 22 114 -23 60 18 23 61 0 2 59 39 36 61 39 31 41 0 0 60 35 40 23 46 39 22 115 -23 60 14 53 60 56 33 59 36 3 61 36 6 42 0 0 60 31 55 23 46 40 22 116 -23 60 11 6 60 52 49 59 32 14 61 32 24 43 0 0 60 27 53 23 46 42 23 117 -23 60 7 3 60 48 49 59 28 8 61 28 27 44 0 0 60 23 36 23 46 43 23 118 -22 60 2 44 60 44 33 59 23 46 61 24 14 45 0 0 60 19 2 23 46 44 24 119 -22 59 58 8 60 40 1 59 19 8 61 19 44 46 0 0 60 14 11 23 46 46 24 120 -22 59 53 16 60 35 12 59 14 13 61 14 59 47 0 0 60 9 5 23 46 47 25 121 -21 59 48 8 60 30 7 59 9 1 61 9 58 48 0 0 60 3 41 23 46 49 25 121 -21 59 42 43 60 24 46 59 3 32 61 4 40 49 0 0 59 58 1 23 46 50 26 122 -21 59 37 1 60 19 8 58 57 46 60 59 6 50 0 0 59 52 4 23 46 52 26 123 -20 59 31 2 60 13 13 58 51 44 60 53 15 51 0 0 59 45 51 23 46 53 27 124 -20 59 24 46 60 7 1 58 45 24 60 47 7 52 0 0 59 39 20 23 46 55 27 125 -20 59 18 13 60 0 33 58 38 47 60 40 43 53 0 0 59 32 32 23 46 57 28 126 -19 59 11 23 59 53 48 58 31 53 60 34 2 54 0 0 59 25 27 23 46 58 28 127 -19 59 4 15 59 46 45 58 24 41 60 27 4 55 0 0 59 18 5 23 47 0 29 128 -18 58 56 50 59 39 25 58 17 11 60 19 49 56 0 0 59 10 25 23 47 2 29 129 -18 58 49 8 59 31 47 58 9 24 60 12 16 57 0 0 59 2 27 23 47 4 30 130 -18 58 41 8 59 23 52 58 1 19 60 4 27 58 0 0 58 54 12 23 47 6 30 131 -17 58 32 50 59 15 40 57 52 56 59 56 19 59 0 0 58 45 38 23 47 7 31 132 -17 58 24 13 59 7 9 57 44 15 59 47 54 60 0 0 58 36 47 23 47 9 31 133 -16 58 15 19 58 58 21 57 35 15 59 39 11 61 0 0 58 27 37 23 47 11 32 134 -16 58 6 7 58 49 14 57 25 58 59 30 10 62 0 0 58 18 9 23 47 13 32 135 -16 57 56 36 58 39 49 57 16 21 59 20 51 63 0 0 58 8 23 23 47 15 33 136 -15 57 46 46 58 30 5 57 6 26 59 11 13 64 0 0 57 58 17 23 47 17 33 137 -15 57 36 38 58 20 3 56 56 12 59 1 17 65 0 0 57 47 53 23 47 20 34 138 -14 57 26 11 58 9 43 56 45 39 58 51 2 66 0 0 57 37 11 23 47 22 34 139 -14 57 15 25 57 59 3 56 34 47 58 40 29 67 0 0 57 26 9 23 47 24 35 141 -14 57 4 19 57 48 4 56 23 36 58 29 37 68 0 0 57 14 47 23 47 26 35 142 -13 56 52 55 57 36 46 56 12 5 58 18 25 69 0 0 57 3 7 23 47 29 35 143 -13 56 41 11 57 25 9 56 0 15 58 6 55 70 0 0 56 51 7 23 47 31 36 144 -12 56 29 7 57 13 12 55 48 5 57 55 4 71 0 0 56 38 47 23 47 33 36 145 -12 56 16 44 57 0 56 55 35 36 57 42 55 72 0 0 56 26 7 23 47 36 37 146 -11 56 4 1 56 48 20 55 22 46 57 30 25 73 0 0 56 13 7 23 47 38 37 147 -11 55 50 58 56 35 24 55 9 37 57 17 36 74 0 0 55 59 48 23 47 41 38 148 -10 55 37 35 56 22 8 54 56 7 57 4 27 75 0 0 55 46 8 23 47 44 38 149 -10 55 23 51 56 8 32 54 42 17 56 50 58 76 0 0 55 32 8 23 47 46 39 150 -9 55 9 47 55 54 35 54 28 7 56 37 8 77 0 0 55 17 47 23 47 49 39 152 -9 54 55 23 55 40 18 54 13 36 56 22 58 78 0 0 55 3 6 23 47 52 40 153 -8 54 40 38 55 25 40 53 58 44 56 8 28 79 0 0 54 48 4 23 47 55 40 154 -8 54 25 33 55 10 42 53 43 32 55 53 36 80 0 0 54 32 41 23 47 57 41 155 -7 54 10 7 54 55 23 53 27 59 55 38 25 81 0 0 54 16 58 23 48 0 41 156 -7 53 54 20 54 39 44 53 12 6 55 22 52 82 0 0 54 0 53 23 48 3 42 158 -6 53 38 12 54 23 43 52 55 51 55 6 58 83 0 0 53 44 28 23 48 6 42 159 -5 53 21 43 54 7 21 52 39 15 54 50 43 84 0 0 53 27 42 23 48 9 43 160 -5 53 4 53 53 50 38 52 22 19 54 34 8 85 0 0 53 10 34 23 48 13 43 161 -4 52 47 42 53 33 35 52 5 1 54 17 11 86 0 0 52 53 6 23 48 16 44 163 -4 52 30 10 53 16 10 51 47 23 53 59 53 87 0 0 52 35 16 23 48 19 44 164 -3 52 12 16 52 58 23 51 29 23 53 42 13 88 0 0 52 17 5 23 48 22 45 165 -2 51 54 2 52 40 16 51 11 2 53 24 13 89 0 0 51 58 33 23 48 26 45 166 -2 51 35 27 52 21 48 50 52 21 53 5 51 90 0 0 51 39 40 23 48 29 46 168 -1 51 16 30 52 2 58 50 33 18 52 47 8 91 0 0 51 20 26 23 48 33 46 169 -1 50 57 13 51 43 47 50 13 55 52 28 4 Uncertainty in time = +/- 3 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: TYC 0746-01510-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 38 49.4997 DE: +07 41 23.360 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .026 ) * V mag [mag]: 11.3 * B mag [mag]: 11.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (218) Bianca approx. diameter [km]: 61 approx. diameter ["]: .029 distance from Earth [AU]: 2.89700 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 957 number of rejected observations: 103 time covered by the observations: 1901 Jun 08 - 2012 Jan 27 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.008, 89° remarks: * orbital elements for (218) Bianca : Mean anomaly = 212.78481633 deg Arg. of pericenter = 62.42085883 deg Long. of node = 170.70485201 deg Inclination = 15.19346328 deg Eccentricity = 0.11583852 Semimajor axis = 2.66937870 AU Perihelion dist = 2.36016184 AU Mag: H = 8.60, G = 0.32 Epoch of elements : MJD 56194.99300000 TDT (2012 Sep 24.993) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 24 218 Bianca 23h 50.3m UT 11.3 6 38 49.500 7 41 23.36TYC 0746-01510-1 11.4 14.0 61 3.0 2.897 2.166 -13.21 97.9245 7.694 -179.64 -0.93 23.8381 0.22568 0.56111 10.60859 -4.35150 -0.00569 0.00019 2000 211.6564492012 920.00000 62.420859170.704852 15.1934630.11583852 2.6693787 2.3601618 8.6 5.00.32 RATE 2.2598980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.027 90 1.94 0.027 0 0-3 0 056146.0020120924_1510-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 20:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org