IOTA/IOTA-ES occultation update for (34) Circe / 2UCAC 35750647 event on 2012 Nov 16, 18:48 UT Visible from Japan, E Russia Summary ------- On 2012 Nov 16 UT, the 117 km diameter asteroid (34) Circe will occult a 11.7 mag star in the constellation Cancer for observers along a path across Japan, E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.1 mag (the magnitude of the asteroid) for at most 10.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 97 * date and approx. time of event: 2012 Nov 16, 18:39 - 2012 Nov 16, 18:49 UT * geocentric midpoint of event [JD]: 2456248.28358333 * magnitude of target star: 11.7 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 10.7 * Moon: 11 % sunlit, 144° distance * Sun: 104° distance * rough path description: Japan, E Russia The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .030", 94° ) * approx speed of asteroid's shadow [km/s]: 10.8456 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 35750647 by 34 Circe on 2012 Nov 16 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 53 0 0 48 1 41 18 39 23 1 74 -55 47 25 48 48 37 43 46 58 39 49 5 13 54 0 0 48 13 33 18 39 24 1 74 -56 47 37 45 48 49 30 47 10 40 49 16 56 55 0 0 48 25 2 18 39 24 2 75 -56 47 49 20 49 0 54 47 22 18 49 28 16 56 0 0 48 36 8 18 39 24 3 76 -56 48 0 31 49 11 55 47 33 33 49 39 14 57 0 0 48 46 52 18 39 24 3 77 -56 48 11 20 49 22 34 47 44 25 49 49 49 58 0 0 48 57 13 18 39 25 4 77 -57 48 21 45 49 32 51 47 54 54 50 0 1 59 0 0 49 7 12 18 39 26 5 78 -57 48 31 49 49 42 45 48 5 1 50 9 52 60 0 0 49 16 48 18 39 26 5 79 -57 48 41 30 49 52 16 48 14 45 50 19 20 61 0 0 49 26 3 18 39 27 6 80 -57 48 50 48 50 1 26 48 24 7 50 28 27 62 0 0 49 34 55 18 39 28 7 80 -57 48 59 45 50 10 14 48 33 7 50 37 11 63 0 0 49 43 25 18 39 29 7 81 -57 49 8 19 50 18 40 48 41 44 50 45 34 64 0 0 49 51 33 18 39 30 8 82 -58 49 16 31 50 26 44 48 49 59 50 53 35 65 0 0 49 59 20 18 39 31 9 83 -58 49 24 21 50 34 27 48 57 52 51 1 15 66 0 0 50 6 44 18 39 32 9 83 -58 49 31 50 50 41 48 49 5 24 51 8 33 67 0 0 50 13 48 18 39 33 10 84 -58 49 38 56 50 48 48 49 12 33 51 15 30 68 0 0 50 20 29 18 39 35 11 85 -58 49 45 41 50 55 26 49 19 21 51 22 6 69 0 0 50 26 50 18 39 36 11 86 -58 49 52 5 51 1 43 49 25 47 51 28 20 70 0 0 50 32 49 18 39 37 12 87 -58 49 58 7 51 7 39 49 31 51 51 34 14 71 0 0 50 38 26 18 39 39 13 87 -58 50 3 48 51 13 14 49 37 34 51 39 46 72 0 0 50 43 43 18 39 41 13 88 -58 50 9 7 51 18 28 49 42 55 51 44 58 73 0 0 50 48 39 18 39 42 14 89 -58 50 14 5 51 23 21 49 47 55 51 49 49 74 0 0 50 53 13 18 39 44 15 90 -58 50 18 42 51 27 53 49 52 34 51 54 19 75 0 0 50 57 27 18 39 46 15 91 -58 50 22 58 51 32 4 49 56 52 51 58 29 76 0 0 51 1 19 18 39 48 16 91 -58 50 26 53 51 35 54 50 0 48 52 2 18 77 0 0 51 4 51 18 39 50 16 92 -58 50 30 27 51 39 24 50 4 23 52 5 46 78 0 0 51 8 2 18 39 52 17 93 -58 50 33 39 51 42 34 50 7 37 52 8 54 79 0 0 51 10 52 18 39 54 18 94 -58 50 36 31 51 45 22 50 10 30 52 11 41 80 0 0 51 13 22 18 39 56 18 95 -58 50 39 2 51 47 50 50 13 2 52 14 8 81 0 0 51 15 31 18 39 58 19 95 -57 50 41 12 51 49 58 50 15 13 52 16 15 82 0 0 51 17 19 18 40 1 20 96 -57 50 43 1 51 51 45 50 17 3 52 18 1 83 0 0 51 18 46 18 40 3 20 97 -57 50 44 30 51 53 11 50 18 33 52 19 27 84 0 0 51 19 53 18 40 6 21 98 -57 50 45 37 51 54 17 50 19 41 52 20 32 85 0 0 51 20 39 18 40 8 21 99 -57 50 46 24 51 55 3 50 20 28 52 21 17 86 0 0 51 21 5 18 40 11 22 100 -57 50 46 50 51 55 28 50 20 54 52 21 42 87 0 0 51 21 10 18 40 13 23 100 -57 50 46 55 51 55 33 50 20 59 52 21 46 88 0 0 51 20 54 18 40 16 23 101 -56 50 46 39 51 55 17 50 20 43 52 21 31 89 0 0 51 20 17 18 40 19 24 102 -56 50 46 3 51 54 40 50 20 7 52 20 54 90 0 0 51 19 20 18 40 22 25 103 -56 50 45 5 51 53 43 50 19 9 52 19 57 91 0 0 51 18 2 18 40 25 25 104 -56 50 43 46 51 52 26 50 17 50 52 18 40 92 0 0 51 16 23 18 40 28 26 105 -55 50 42 7 51 50 47 50 16 10 52 17 3 93 0 0 51 14 23 18 40 31 26 105 -55 50 40 6 51 48 49 50 14 8 52 15 4 94 0 0 51 12 2 18 40 34 27 106 -55 50 37 44 51 46 29 50 11 46 52 12 45 95 0 0 51 9 21 18 40 38 28 107 -55 50 35 2 51 43 48 50 9 2 52 10 6 96 0 0 51 6 18 18 40 41 28 108 -54 50 31 57 51 40 47 50 5 57 52 7 5 97 0 0 51 2 54 18 40 44 29 109 -54 50 28 32 51 37 25 50 2 30 52 3 44 98 0 0 50 59 9 18 40 48 30 110 -54 50 24 45 51 33 41 49 58 42 52 0 2 99 0 0 50 55 2 18 40 51 30 111 -53 50 20 37 51 29 37 49 54 33 51 55 59 100 0 0 50 50 35 18 40 55 31 111 -53 50 16 7 51 25 11 49 50 1 51 51 35 101 0 0 50 45 45 18 40 59 31 112 -53 50 11 15 51 20 24 49 45 8 51 46 50 102 0 0 50 40 34 18 41 3 32 113 -52 50 6 2 51 15 16 49 39 53 51 41 43 103 0 0 50 35 2 18 41 7 33 114 -52 50 0 27 51 9 46 49 34 15 51 36 15 104 0 0 50 29 7 18 41 11 33 115 -51 49 54 29 51 3 54 49 28 16 51 30 26 105 0 0 50 22 51 18 41 15 34 116 -51 49 48 10 50 57 40 49 21 54 51 24 15 106 0 0 50 16 12 18 41 19 35 117 -51 49 41 28 50 51 5 49 15 10 51 17 41 107 0 0 50 9 11 18 41 23 35 118 -50 49 34 24 50 44 7 49 8 4 51 10 46 108 0 0 50 1 48 18 41 27 36 119 -50 49 26 57 50 36 47 49 0 34 51 3 29 109 0 0 49 54 2 18 41 32 36 120 -49 49 19 8 50 29 5 48 52 42 50 55 50 110 0 0 49 45 54 18 41 36 37 121 -49 49 10 56 50 21 1 48 44 27 50 47 48 111 0 0 49 37 22 18 41 41 38 122 -48 49 2 20 50 12 33 48 35 49 50 39 24 112 0 0 49 28 28 18 41 45 38 122 -48 48 53 22 50 3 43 48 26 47 50 30 37 113 0 0 49 19 10 18 41 50 39 123 -47 48 44 0 49 54 30 48 17 22 50 21 27 114 0 0 49 9 29 18 41 55 40 124 -47 48 34 15 49 44 53 48 7 34 50 11 54 115 0 0 48 59 25 18 42 0 40 125 -47 48 24 6 49 34 54 47 57 21 50 1 58 116 0 0 48 48 57 18 42 5 41 126 -46 48 13 33 49 24 30 47 46 45 49 51 38 117 0 0 48 38 5 18 42 10 42 127 -45 48 2 36 49 13 43 47 35 44 49 40 55 118 0 0 48 26 49 18 42 16 42 128 -45 47 51 15 49 2 32 47 24 19 49 29 47 119 0 0 48 15 8 18 42 21 43 129 -44 47 39 29 48 50 57 47 12 30 49 18 16 120 0 0 48 3 3 18 42 26 44 130 -44 47 27 19 48 38 57 47 0 16 49 6 21 121 0 0 47 50 34 18 42 32 44 131 -43 47 14 44 48 26 33 46 47 37 48 54 1 122 0 0 47 37 39 18 42 38 45 133 -43 47 1 44 48 13 44 46 34 32 48 41 17 123 0 0 47 24 20 18 42 43 46 134 -42 46 48 19 48 0 31 46 21 3 48 28 7 124 0 0 47 10 35 18 42 49 46 135 -42 46 34 29 47 46 52 46 7 8 48 14 33 125 0 0 46 56 25 18 42 55 47 136 -41 46 20 13 47 32 48 45 52 48 48 0 34 126 0 0 46 41 50 18 43 1 48 137 -40 46 5 31 47 18 18 45 38 2 47 46 9 127 0 0 46 26 48 18 43 7 48 138 -40 45 50 23 47 3 23 45 22 49 47 31 18 128 0 0 46 11 21 18 43 14 49 139 -39 45 34 50 46 48 2 45 7 11 47 16 2 129 0 0 45 55 27 18 43 20 50 140 -39 45 18 50 46 32 15 44 51 7 47 0 20 130 0 0 45 39 8 18 43 27 50 142 -38 45 2 24 46 16 2 44 34 35 46 44 12 131 0 0 45 22 21 18 43 33 51 143 -37 44 45 31 45 59 22 44 17 38 46 27 37 132 0 0 45 5 8 18 43 40 51 144 -37 44 28 11 45 42 16 44 0 13 46 10 36 133 0 0 44 47 29 18 43 47 52 145 -36 44 10 25 45 24 43 43 42 22 45 53 8 134 0 0 44 29 22 18 43 54 53 147 -35 43 52 12 45 6 43 43 24 3 45 35 14 135 0 0 44 10 48 18 44 1 53 148 -35 43 33 31 44 48 16 43 5 18 45 16 52 136 0 0 43 51 47 18 44 8 54 149 -34 43 14 23 44 29 22 42 46 5 44 58 3 137 0 0 43 32 19 18 44 16 55 151 -33 42 54 48 44 10 1 42 26 25 44 38 47 138 0 0 43 12 24 18 44 23 55 152 -32 42 34 46 43 50 12 42 6 17 44 19 4 139 0 0 42 52 1 18 44 31 56 154 -32 42 14 16 43 29 56 41 45 42 43 58 54 140 0 0 42 31 10 18 44 39 57 155 -31 41 53 19 43 9 13 41 24 40 43 38 15 141 0 0 42 9 52 18 44 47 57 157 -30 41 31 54 42 48 2 41 3 9 43 17 10 142 0 0 41 48 6 18 44 55 58 158 -29 41 10 1 42 26 23 40 41 12 42 55 36 143 0 0 41 25 53 18 45 3 59 160 -29 40 47 41 42 4 17 40 18 46 42 33 35 144 0 0 41 3 12 18 45 11 59 162 -28 40 24 53 41 41 43 39 55 53 42 11 7 145 0 0 40 40 3 18 45 19 60 163 -27 40 1 38 41 18 41 39 32 33 41 48 11 146 0 0 40 16 28 18 45 28 60 165 -26 39 37 55 40 55 12 39 8 45 41 24 47 147 0 0 39 52 24 18 45 37 61 167 -25 39 13 45 40 31 15 38 44 30 41 0 55 148 0 0 39 27 54 18 45 45 62 169 -25 38 49 8 40 6 52 38 19 48 40 36 37 149 0 0 39 2 56 18 45 54 62 171 -24 38 24 3 39 42 0 37 54 39 40 11 51 150 0 0 38 37 31 18 46 3 63 173 -23 37 58 32 39 16 42 37 29 3 39 46 38 151 0 0 38 11 40 18 46 12 63 175 -22 37 32 34 38 50 57 37 3 0 39 20 58 152 0 0 37 45 22 18 46 22 64 177 -21 37 6 10 38 24 46 36 36 31 38 54 51 153 0 0 37 18 38 18 46 31 64 180 -20 36 39 20 37 58 8 36 9 36 38 28 18 154 0 0 36 51 27 18 46 41 65 182 -19 36 12 4 37 31 4 35 42 16 38 1 18 155 0 0 36 23 52 18 46 50 65 185 -19 35 44 23 37 3 34 35 14 30 37 33 53 156 0 0 35 55 51 18 47 0 65 187 -18 35 16 16 36 35 39 34 46 19 37 6 2 157 0 0 35 27 25 18 47 10 66 190 -17 34 47 45 36 7 18 34 17 44 36 37 46 158 0 0 34 58 35 18 47 20 66 192 -16 34 18 50 35 38 34 33 48 45 36 9 6 159 0 0 34 29 22 18 47 30 66 195 -15 33 49 31 35 9 25 33 19 23 35 40 1 160 0 0 33 59 45 18 47 40 66 198 -14 33 19 49 34 39 53 32 49 37 35 10 33 161 0 0 33 29 45 18 47 50 67 201 -13 32 49 45 34 9 58 32 19 30 34 40 41 162 0 0 32 59 23 18 48 0 67 204 -12 32 19 19 33 39 41 31 49 0 34 10 27 163 0 0 32 28 40 18 48 11 67 207 -11 31 48 32 33 9 2 31 18 10 33 39 52 164 0 0 31 57 36 18 48 21 67 210 -10 31 17 24 32 38 2 30 47 0 33 8 55 165 0 0 31 26 13 18 48 32 67 213 -9 30 45 57 32 6 42 30 15 30 32 37 38 166 0 0 30 54 30 18 48 43 67 216 -8 30 14 11 31 35 3 29 43 41 32 6 1 167 0 0 30 22 29 18 48 53 67 219 -7 29 42 7 31 3 5 29 11 35 31 34 5 168 0 0 29 50 11 18 49 4 67 222 -6 29 9 46 30 30 49 28 39 12 31 1 52 169 0 0 29 17 36 18 49 15 66 224 -5 28 37 9 29 58 17 28 6 33 30 29 21 170 0 0 28 44 45 18 49 26 66 227 -4 28 4 16 29 25 28 27 33 39 29 56 35 171 0 0 28 11 40 18 49 37 66 230 -3 27 31 9 28 52 25 27 0 31 29 23 33 172 0 0 27 38 22 18 49 48 65 233 -2 26 57 49 28 19 8 26 27 10 28 50 17 173 0 0 27 4 51 18 49 59 65 235 -1 26 24 17 27 45 38 25 53 37 28 16 48 Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: 2UCAC 35750647 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 43 14.8743 DE: +11 25 13.355 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .026, .029 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe approx. diameter [km]: 117 approx. diameter ["]: .079 distance from Earth [AU]: 2.04400 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1513 number of rejected observations: 142 time covered by the observations: 1914 Sep 26 - 2012 Sep 30 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.008, 101° remarks: * orbital elements for (34) Circe : Mean anomaly = 321.13034956 deg Arg. of pericenter = 330.06988697 deg Long. of node = 184.44834873 deg Inclination = 5.49800967 deg Eccentricity = 0.10467044 Semimajor axis = 2.68762391 AU Perihelion dist = 2.40630913 AU Mag: H = 8.49, G = 0.15 Epoch of elements : MJD 56247.78300000 TDT (2012 Nov 16.783) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 16 34 Circe 18h 48.4m UT 11.7 8 43 14.874 11 25 13.352UCAC 35750647 0.0 13.1 117 10.7 2.044 1.609 -11.54 152.4797 11.424 -105.86 -18.97 18.8060 0.16726 0.35163 5.50290 -2.68170 -0.00537 0.00163 2000 319.389352201211 9.00000330.069887184.448349 5.4980100.10467044 2.6876239 2.4063091 8.5 5.00.15 RATE 2.2369240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.030 94 1.38 0.030 0 0 3 5 056208.0020121116_750647 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org