IOTA/IOTA-ES occultation update for (313) Chaldaea / TYC 5257-00806-1 event on 2012 Oct 22, 01:45 UT Visible from SE Canada, Caribbean, Central America Summary ------- On 2012 Oct 22 UT, the 95 km diameter asteroid (313) Chaldaea will occult a 11.4 mag star in the constellation Aquarius for observers along a path across SE Canada, Caribbean, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.9 mag (the magnitude of the asteroid) for at most 11.5 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: 84 * date and approx. time of event: 2012 Oct 22, 01:34 - 2012 Oct 22, 01:53 UT * geocentric midpoint of event [JD]: 2456222.57340833 * magnitude of target star: 11.4 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 11.5 * Moon: 50 % sunlit, 54° distance * Sun: 144° distance * rough path description: SE Canada, Caribbean, Central America The occultation path -------------------- * approximate projected width [km]: 113 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .038", 89° ) * approx speed of asteroid's shadow [km/s]: 8.2683 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5257-00806-1 by 313 Chaldaea on 2012 Oct 22 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 3 59 12 75 0 0 1 34 59 1 244 -24 - 0 19 25 ... .. .. - 5 7 7 ... .. .. - 2 59 6 74 0 0 1 35 1 3 237 -26 - 6 27 52 0 46 47 - 10 28 54 6 0 38 Latitude Latitude Latitude Latitude - 4 0 0 73 49 46 1 35 1 4 236 -26 74 25 51 73 13 58 75 11 0 72 29 57 - 5 0 0 73 39 17 1 35 1 4 235 -26 74 15 40 73 3 11 75 1 11 72 18 48 - 6 0 0 73 28 22 1 35 2 4 234 -26 74 5 4 72 51 59 74 50 59 72 7 14 - 7 0 0 73 17 2 1 35 2 5 233 -27 73 54 3 72 40 20 74 40 22 71 55 13 - 8 0 0 73 5 15 1 35 3 5 232 -27 73 42 35 72 28 14 74 29 20 71 42 44 - 9 0 0 72 53 0 1 35 3 5 231 -27 73 30 41 72 15 39 74 17 51 71 29 45 - 10 0 0 72 40 17 1 35 4 6 230 -28 73 18 18 72 2 36 74 5 55 71 16 18 - 11 0 0 72 27 4 1 35 4 6 229 -28 73 5 26 71 49 2 73 53 31 71 2 19 - 12 0 0 72 13 21 1 35 5 6 228 -28 72 52 5 71 34 57 73 40 37 70 47 49 - 13 0 0 71 59 5 1 35 6 7 228 -29 72 38 12 71 20 20 73 27 12 70 32 46 - 14 0 0 71 44 17 1 35 6 7 227 -29 72 23 46 71 5 10 73 13 16 70 17 9 - 15 0 0 71 28 55 1 35 7 8 226 -29 72 8 48 70 49 25 72 58 48 70 0 56 - 16 0 0 71 12 58 1 35 8 8 225 -30 71 53 14 70 33 5 72 43 45 69 44 8 - 17 0 0 70 56 24 1 35 9 8 224 -30 71 37 5 70 16 7 72 28 7 69 26 42 - 18 0 0 70 39 13 1 35 10 9 223 -30 71 20 18 69 58 32 72 11 52 69 8 38 - 19 0 0 70 21 22 1 35 11 9 222 -31 71 2 53 69 40 17 71 55 0 68 49 54 - 20 0 0 70 2 51 1 35 13 10 221 -31 70 44 48 69 21 21 71 37 28 68 30 28 - 21 0 0 69 43 39 1 35 14 10 220 -31 70 26 2 69 1 43 71 19 16 68 10 20 - 22 0 0 69 23 43 1 35 15 11 219 -32 70 6 33 68 41 22 71 0 21 67 49 28 - 23 0 0 69 3 2 1 35 17 11 218 -32 69 46 19 68 20 15 70 40 42 67 27 50 - 24 0 0 68 41 36 1 35 18 12 217 -32 69 25 19 67 58 22 70 20 17 67 5 26 - 25 0 0 68 19 21 1 35 20 12 216 -33 69 3 32 67 35 41 69 59 6 66 42 13 - 26 0 0 67 56 17 1 35 22 13 215 -33 68 40 56 67 12 10 69 37 6 66 18 10 - 27 0 0 67 32 22 1 35 24 13 214 -34 68 17 29 66 47 48 69 14 15 65 53 17 - 28 0 0 67 7 34 1 35 26 14 213 -34 67 53 10 66 22 34 68 50 32 65 27 30 - 29 0 0 66 41 53 1 35 28 14 212 -34 67 27 56 65 56 25 68 25 55 65 0 49 - 30 0 0 66 15 15 1 35 31 15 212 -35 67 1 46 65 29 20 68 0 22 64 33 13 - 31 0 0 65 47 40 1 35 33 16 211 -35 66 34 39 65 1 18 67 33 51 64 4 39 - 32 0 0 65 19 6 1 35 36 16 210 -36 66 6 33 64 32 18 67 6 22 63 35 7 - 33 0 0 64 49 31 1 35 39 17 209 -36 65 37 26 64 2 17 66 37 51 63 4 35 - 34 0 0 64 18 54 1 35 42 18 208 -37 65 7 17 63 31 14 66 8 17 62 33 1 - 35 0 0 63 47 14 1 35 46 18 207 -37 64 36 3 62 59 8 65 37 38 62 0 25 - 36 0 0 63 14 29 1 35 49 19 206 -38 64 3 44 62 25 57 65 5 54 61 26 45 - 37 0 0 62 40 37 1 35 53 20 205 -38 63 30 18 61 51 41 64 33 2 60 52 0 - 38 0 0 62 5 38 1 35 57 20 204 -39 62 55 44 61 16 18 63 59 0 60 16 9 - 39 0 0 61 29 30 1 36 1 21 203 -39 62 20 0 60 39 48 63 23 48 59 39 12 - 40 0 0 60 52 12 1 36 6 22 202 -40 61 43 6 60 2 8 62 47 24 59 1 7 - 41 0 0 60 13 45 1 36 11 23 201 -40 61 5 0 59 23 20 62 9 47 58 21 54 - 42 0 0 59 34 6 1 36 16 23 200 -40 60 25 41 58 43 21 61 30 57 57 41 32 - 43 0 0 58 53 15 1 36 21 24 199 -41 59 45 10 58 2 12 60 50 51 57 0 2 - 44 0 0 58 11 13 1 36 27 25 198 -41 59 3 26 57 19 52 60 9 31 56 17 22 - 45 0 0 57 27 58 1 36 33 26 197 -42 58 20 28 56 36 23 59 26 55 55 33 34 - 46 0 0 56 43 32 1 36 40 27 196 -42 57 36 17 55 51 43 58 43 4 54 48 38 - 47 0 0 55 57 55 1 36 47 28 195 -43 56 50 53 55 5 53 57 57 58 54 2 34 - 48 0 0 55 11 7 1 36 54 29 195 -43 56 4 17 54 18 54 57 11 37 53 15 23 - 49 0 0 54 23 10 1 37 1 29 194 -44 55 16 29 53 30 48 56 24 2 52 27 6 - 50 0 0 53 34 4 1 37 9 30 193 -44 54 27 31 52 41 35 55 35 14 51 37 45 - 51 0 0 52 43 51 1 37 18 31 192 -45 53 37 24 51 51 17 54 45 14 50 47 21 - 52 0 0 51 52 33 1 37 26 32 191 -45 52 46 10 50 59 55 53 54 5 49 55 55 - 53 0 0 51 0 12 1 37 36 33 189 -45 51 53 50 50 7 33 53 1 48 49 3 31 - 54 0 0 50 6 50 1 37 45 34 188 -46 51 0 28 49 14 11 52 8 25 48 10 10 - 55 0 0 49 12 30 1 37 55 35 187 -46 50 6 5 48 19 53 51 14 0 47 15 54 - 56 0 0 48 17 14 1 38 6 36 186 -46 49 10 45 47 24 41 50 18 34 46 20 47 - 57 0 0 47 21 5 1 38 16 37 185 -47 48 14 30 46 28 38 49 22 11 45 24 51 - 58 0 0 46 24 7 1 38 28 38 184 -47 47 17 24 45 31 48 48 24 54 44 28 10 - 59 0 0 45 26 23 1 38 39 39 183 -47 46 19 30 44 34 13 47 26 47 43 30 46 - 60 0 0 44 27 56 1 38 51 40 182 -47 45 20 52 43 35 58 46 27 53 42 32 44 - 61 0 0 43 28 51 1 39 4 41 180 -47 44 21 33 42 37 5 45 28 17 41 34 6 - 62 0 0 42 29 11 1 39 17 42 179 -47 43 21 38 41 37 39 44 28 2 40 34 56 - 63 0 0 41 28 59 1 39 30 43 178 -47 42 21 10 40 37 43 43 27 13 39 35 18 - 64 0 0 40 28 20 1 39 44 44 176 -47 41 20 13 39 37 21 42 25 53 38 35 16 - 65 0 0 39 27 18 1 39 58 45 175 -47 40 18 52 38 36 36 41 24 7 37 34 53 - 66 0 0 38 25 57 1 40 12 46 174 -47 39 17 11 37 35 34 40 21 59 36 34 13 - 67 0 0 37 24 20 1 40 27 47 172 -47 38 15 13 36 34 18 39 19 33 35 33 20 - 68 0 0 36 22 32 1 40 42 48 171 -47 37 13 3 35 32 51 38 16 54 34 32 17 - 69 0 0 35 20 37 1 40 57 49 169 -47 36 10 45 34 31 17 37 14 6 33 31 9 - 70 0 0 34 18 38 1 41 13 50 167 -46 35 8 22 33 29 40 36 11 12 32 29 59 - 71 0 0 33 16 39 1 41 28 50 166 -46 34 5 59 32 28 5 35 8 17 31 28 50 - 72 0 0 32 14 44 1 41 45 51 164 -45 33 3 40 31 26 33 34 5 25 30 27 47 - 73 0 0 31 12 57 1 42 1 52 162 -45 32 1 27 30 25 10 33 2 40 29 26 51 - 74 0 0 30 11 20 1 42 17 53 160 -45 30 59 25 29 23 58 32 0 4 28 26 8 - 75 0 0 29 9 58 1 42 34 53 158 -44 29 57 37 28 23 0 30 57 42 27 25 39 - 76 0 0 28 8 53 1 42 51 54 156 -43 28 56 6 27 22 19 29 55 37 26 25 28 - 77 0 0 27 8 8 1 43 8 55 154 -43 27 54 55 26 22 0 28 53 53 25 25 37 - 78 0 0 26 7 47 1 43 25 55 152 -42 26 54 8 25 22 3 27 52 31 24 26 10 - 79 0 0 25 7 52 1 43 42 55 150 -41 25 53 46 24 22 33 26 51 36 23 27 9 - 80 0 0 24 8 25 1 43 59 56 148 -41 24 53 54 23 23 31 25 51 10 22 28 37 - 81 0 0 23 9 30 1 44 16 56 145 -40 23 54 33 22 25 1 24 51 15 21 30 36 - 82 0 0 22 11 8 1 44 34 57 143 -39 22 55 45 21 27 3 23 51 54 20 33 8 - 83 0 0 21 13 22 1 44 51 57 141 -38 21 57 34 20 29 42 22 53 9 19 36 15 - 84 0 0 20 16 13 1 45 8 57 139 -38 21 0 0 19 32 58 21 55 3 18 40 0 - 85 0 0 19 19 44 1 45 25 57 136 -37 20 3 6 18 36 53 20 57 37 17 44 24 - 86 0 0 18 23 57 1 45 42 57 134 -36 19 6 54 17 41 29 20 0 53 16 49 28 - 87 0 0 17 28 53 1 46 0 57 132 -35 18 11 26 16 46 48 19 4 53 15 55 15 - 88 0 0 16 34 33 1 46 17 57 130 -34 17 16 42 15 52 52 18 9 38 15 1 46 - 89 0 0 15 40 59 1 46 33 57 127 -33 16 22 45 14 59 41 17 15 10 14 9 3 - 90 0 0 14 48 13 1 46 50 57 125 -32 15 29 35 14 7 17 16 21 31 13 17 5 - 91 0 0 13 56 15 1 47 7 56 123 -31 14 37 14 13 15 41 15 28 41 12 25 55 - 92 0 0 13 5 6 1 47 23 56 121 -30 13 45 43 12 24 54 14 36 41 11 35 34 - 93 0 0 12 14 48 1 47 40 56 119 -29 12 55 3 11 34 57 13 45 32 10 46 3 - 94 0 0 11 25 21 1 47 56 55 117 -28 12 5 15 10 45 51 12 55 16 9 57 22 - 95 0 0 10 36 46 1 48 12 55 116 -27 11 16 19 9 57 36 12 5 53 9 9 32 - 96 0 0 9 49 4 1 48 28 54 114 -26 10 28 16 9 10 14 11 17 24 8 22 34 - 97 0 0 9 2 16 1 48 44 54 112 -25 9 41 7 8 23 45 10 29 49 7 36 29 - 98 0 0 8 16 21 1 48 59 53 111 -24 8 54 53 7 38 10 9 43 9 6 51 16 - 99 0 0 7 31 20 1 49 14 53 109 -23 8 9 33 6 53 28 8 57 24 6 6 57 -100 0 0 6 47 14 1 49 29 52 108 -22 7 25 8 6 9 41 8 12 35 5 23 32 -101 0 0 6 4 4 1 49 44 51 107 -21 6 41 39 5 26 48 7 28 43 4 41 1 -102 0 0 5 21 48 1 49 59 51 105 -20 5 59 5 4 44 50 6 45 46 3 59 24 -103 0 0 4 40 28 1 50 13 50 104 -19 5 17 27 4 3 47 6 3 46 3 18 41 -104 0 0 4 0 4 1 50 27 49 103 -18 4 36 46 3 23 39 5 22 42 2 38 54 -105 0 0 3 20 35 1 50 41 48 102 -17 3 57 0 2 44 26 4 42 36 2 0 1 -106 0 0 2 42 2 1 50 54 48 101 -16 3 18 11 2 6 9 4 3 26 1 22 3 -107 0 0 2 4 24 1 51 8 47 100 -15 2 40 18 1 28 47 3 25 12 0 44 59 -108 0 0 1 27 43 1 51 21 46 99 -14 2 3 21 0 52 21 2 47 56 0 8 51 -109 0 0 0 51 57 1 51 33 45 99 -13 1 27 20 0 16 50 2 11 36 - 0 26 22 -110 0 0 0 17 7 1 51 46 44 98 -12 0 52 16 - 0 17 46 1 36 13 - 1 0 41 -111 0 0 - 0 16 48 1 51 58 43 97 -11 0 18 7 - 0 51 27 1 1 46 - 1 34 5 -112 0 0 - 0 49 47 1 52 10 42 97 -10 - 0 15 6 - 1 24 13 0 28 16 - 2 6 35 -113 0 0 - 1 21 51 1 52 22 42 96 -9 - 0 47 24 - 1 56 4 - 0 4 19 - 2 38 11 -114 0 0 - 1 53 0 1 52 33 41 96 -7 - 1 18 46 - 2 27 1 - 0 35 57 - 3 8 52 -115 0 0 - 2 23 15 1 52 44 40 95 -6 - 1 49 12 - 2 57 3 - 1 6 40 - 3 38 39 -116 0 0 - 2 52 34 1 52 55 39 95 -5 - 2 18 44 - 3 26 11 - 1 36 27 - 4 7 33 -117 0 0 - 3 21 0 1 53 6 38 94 -4 - 2 47 21 - 3 54 25 - 2 5 19 - 4 35 33 -118 0 0 - 3 48 31 1 53 16 37 94 -3 - 3 15 4 - 4 21 45 - 2 33 15 - 5 2 39 -119 0 0 - 4 15 8 1 53 26 36 94 -2 - 3 41 52 - 4 48 11 - 3 0 17 - 5 28 53 -120 0 0 - 4 40 52 1 53 36 35 93 -1 - 4 7 46 - 5 13 45 - 3 26 25 - 5 54 14 -121 0 0 - 5 5 42 1 53 45 34 93 0 - 4 32 46 - 5 38 25 - 3 51 38 - 6 18 42 Uncertainty in time = +/- 9 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 5257-00806-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 36 48.4115 DE: -05 33 41.663 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .055, .036 ) * V mag [mag]: 11.4 * B mag [mag]: 12.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (313) Chaldaea approx. diameter [km]: 95 approx. diameter ["]: .077 distance from Earth [AU]: 1.70700 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1093 number of rejected observations: 119 time covered by the observations: 1902 Sep 02 - 2012 Sep 13 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 80° remarks: * orbital elements for (313) Chaldaea : Mean anomaly = 251.27501438 deg Arg. of pericenter = 316.02470161 deg Long. of node = 176.68829821 deg Inclination = 11.65374943 deg Eccentricity = 0.18154636 Semimajor axis = 2.37456681 AU Perihelion dist = 1.94347286 AU Mag: H = 9.05, G = 0.15 Epoch of elements : MJD 56222.07300000 TDT (2012 Oct 22.073) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 22 313 Chaldaea 1h 45.7m UT 11.4 23 36 48.412- 5 33 41.66TYC 5257-00806-1 12.3 12.9 95 11.5 1.707 -1.168 -16.51 -63.1277 -5.556 149.70 -11.14 1.7618 -0.37159 0.39569 -3.38899 -3.20845 0.00306 0.00156 2000 250.71663820121020.00000316.024702176.688298 11.6537490.18154636 2.3745668 1.9434728 8.9 5.00.15 RATE 2.6935650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.038 89 1.62 0.048 0 0-5-3 056197.0020121022_0806-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 22:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org