IOTA/IOTA-ES occultation update for (1233) Kobresia / TYC 6324-00543-1 event on 2012 Jul 11, 00:45 UT Visible from SW Asia, Africa Summary ------- On 2012 Jul 11 UT, the 36 km diameter asteroid (1233) Kobresia will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across SW Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.3 mag (the magnitude of the asteroid) for at most 3.7 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: 41 * date and approx. time of event: 2012 Jul 11, 00:38 - 2012 Jul 11, 00:51 UT * geocentric midpoint of event [JD]: 2456119.53145 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 3.7 * Moon: 51 % sunlit, 82° distance * Sun: 173° distance * rough path description: SW Asia, Africa The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 1.61 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .056) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .053", 357° ) * approx speed of asteroid's shadow [km/s]: 9.8273 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6324-00543-1 by 1233 Kobresia on 2012 Jul 11 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 - 67 3 52 48 0 0 0 51 49 2 124 -4 - 66 17 46 - 67 49 39 - 63 47 7 ... .. .. - 64 39 35 47 0 0 0 51 48 3 126 -6 - 63 53 19 - 65 25 31 - 61 21 50 ... .. .. Latitude Latitude Latitude Latitude - 64 0 0 46 43 40 0 51 47 4 126 -7 47 2 45 46 24 45 48 5 22 .. .. .. - 63 0 0 46 19 3 0 51 46 5 127 -7 46 38 4 46 0 12 47 40 26 .. .. .. - 62 0 0 45 54 36 0 51 45 6 128 -8 46 13 32 45 35 49 47 15 40 44 36 21 - 61 0 0 45 30 19 0 51 43 6 128 -9 45 49 12 45 11 37 46 51 4 44 12 22 - 60 0 0 45 6 14 0 51 41 7 129 -10 45 25 2 44 47 36 46 26 40 43 48 34 - 59 0 0 44 42 22 0 51 39 8 130 -11 45 1 5 44 23 47 46 2 28 43 24 59 - 58 0 0 44 18 42 0 51 37 9 130 -11 44 37 21 44 0 12 45 38 29 43 1 36 - 57 0 0 43 55 16 0 51 35 10 131 -12 44 13 51 43 36 50 45 14 44 42 38 28 - 56 0 0 43 32 5 0 51 32 10 132 -13 43 50 35 43 13 43 44 51 13 42 15 34 - 55 0 0 43 9 8 0 51 29 11 133 -14 43 27 34 42 50 51 44 27 58 41 52 55 - 54 0 0 42 46 28 0 51 26 12 133 -14 43 4 50 42 28 15 44 4 58 41 30 32 - 53 0 0 42 24 4 0 51 23 13 134 -15 42 42 21 42 5 56 43 42 15 41 8 26 - 52 0 0 42 1 57 0 51 20 13 135 -16 42 20 10 41 43 53 43 19 49 40 46 36 - 51 0 0 41 40 8 0 51 16 14 135 -17 41 58 17 41 22 8 42 57 41 40 25 4 - 50 0 0 41 18 37 0 51 12 15 136 -17 41 36 42 41 0 42 42 35 52 40 3 51 - 49 0 0 40 57 26 0 51 8 16 137 -18 41 15 26 40 39 34 42 14 21 39 42 56 - 48 0 0 40 36 33 0 51 4 17 138 -19 40 54 29 40 18 45 41 53 11 39 22 20 - 47 0 0 40 16 1 0 50 59 17 138 -20 40 33 52 39 58 17 41 32 20 39 2 4 - 46 0 0 39 55 48 0 50 55 18 139 -20 40 13 36 39 38 9 41 11 50 38 42 8 - 45 0 0 39 35 57 0 50 50 19 140 -21 39 53 41 39 18 22 40 51 41 38 22 33 - 44 0 0 39 16 28 0 50 45 20 141 -22 39 34 7 38 58 56 40 31 54 38 3 19 - 43 0 0 38 57 20 0 50 40 20 141 -22 39 14 55 38 39 52 40 12 29 37 44 27 - 42 0 0 38 38 34 0 50 34 21 142 -23 38 56 6 38 21 10 39 53 26 37 25 57 - 41 0 0 38 20 11 0 50 29 22 143 -24 38 37 39 38 2 50 39 34 47 37 7 49 - 40 0 0 38 2 11 0 50 23 22 144 -24 38 19 35 37 44 54 39 16 30 36 50 4 - 39 0 0 37 44 35 0 50 17 23 144 -25 38 1 55 37 27 21 38 58 38 36 32 42 - 38 0 0 37 27 22 0 50 11 24 145 -25 37 44 39 37 10 12 38 41 10 36 15 43 - 37 0 0 37 10 33 0 50 5 24 146 -26 37 27 47 36 53 27 38 24 6 35 59 9 - 36 0 0 36 54 9 0 49 58 25 147 -27 37 11 19 36 37 6 38 7 27 35 42 58 - 35 0 0 36 38 10 0 49 52 26 148 -27 36 55 17 36 21 10 37 51 13 35 27 12 - 34 0 0 36 22 36 0 49 45 26 148 -28 36 39 39 36 5 39 37 35 25 35 11 51 - 33 0 0 36 7 27 0 49 38 27 149 -28 36 24 27 35 50 33 37 20 2 34 56 55 - 32 0 0 35 52 44 0 49 31 28 150 -29 36 9 41 35 35 53 37 5 5 34 42 24 - 31 0 0 35 38 26 0 49 24 28 151 -29 35 55 20 35 21 38 36 50 35 34 28 18 - 30 0 0 35 24 35 0 49 16 29 152 -30 35 41 26 35 7 50 36 36 31 34 14 38 - 29 0 0 35 11 10 0 49 9 29 153 -30 35 27 58 34 54 28 36 22 54 34 1 24 - 28 0 0 34 58 11 0 49 1 30 154 -31 35 14 57 34 41 32 36 9 43 33 48 37 - 27 0 0 34 45 39 0 48 54 30 155 -31 35 2 23 34 29 2 35 57 0 33 36 15 - 26 0 0 34 33 34 0 48 46 31 156 -32 34 50 15 34 17 0 35 44 44 33 24 21 - 25 0 0 34 21 56 0 48 38 31 157 -32 34 38 35 34 5 24 35 32 56 33 12 52 - 24 0 0 34 10 46 0 48 30 32 157 -32 34 27 22 33 54 16 35 21 35 33 1 51 - 23 0 0 34 0 3 0 48 22 32 158 -33 34 16 37 33 43 35 35 10 42 32 51 17 - 22 0 0 33 49 47 0 48 13 33 159 -33 34 6 19 33 33 22 35 0 17 32 41 10 - 21 0 0 33 39 59 0 48 5 33 160 -34 33 56 29 33 23 36 34 50 20 32 31 30 - 20 0 0 33 30 39 0 47 57 34 161 -34 33 47 7 33 14 18 34 40 52 32 22 18 - 19 0 0 33 21 47 0 47 48 34 162 -34 33 38 13 33 5 27 34 31 52 32 13 33 - 18 0 0 33 13 23 0 47 40 34 163 -34 33 29 47 32 57 5 34 23 20 32 5 16 - 17 0 0 33 5 27 0 47 31 35 164 -35 33 21 49 32 49 11 34 15 17 31 57 27 - 16 0 0 32 57 59 0 47 22 35 166 -35 33 14 20 32 41 44 34 7 42 31 50 6 - 15 0 0 32 51 0 0 47 13 35 167 -35 33 7 19 32 34 47 34 0 37 31 43 12 - 14 0 0 32 44 29 0 47 4 36 168 -35 33 0 47 32 28 17 33 54 0 31 36 47 - 13 0 0 32 38 27 0 46 56 36 169 -35 32 54 44 32 22 16 33 47 52 31 30 49 - 12 0 0 32 32 53 0 46 47 36 170 -35 32 49 9 32 16 43 33 42 14 31 25 20 - 11 0 0 32 27 48 0 46 38 36 171 -36 32 44 3 32 11 39 33 37 4 31 20 19 - 10 0 0 32 23 12 0 46 28 37 172 -36 32 39 25 32 7 4 33 32 23 31 15 47 - 9 0 0 32 19 4 0 46 19 37 173 -36 32 35 17 32 2 57 33 28 12 31 11 43 - 8 0 0 32 15 25 0 46 10 37 174 -36 32 31 37 31 59 19 33 24 30 31 8 7 - 7 0 0 32 12 15 0 46 1 37 175 -36 32 28 27 31 56 10 33 21 17 31 4 59 - 6 0 0 32 9 34 0 45 52 37 176 -36 32 25 45 31 53 29 33 18 34 31 2 21 - 5 0 0 32 7 22 0 45 43 37 178 -36 32 23 32 31 51 17 33 16 19 31 0 10 - 4 0 0 32 5 39 0 45 33 37 179 -36 32 21 49 31 49 34 33 14 35 30 58 28 - 3 0 0 32 4 24 0 45 24 37 180 -36 32 20 34 31 48 20 33 13 19 30 57 15 - 2 0 0 32 3 39 0 45 15 37 181 -35 32 19 49 31 47 35 33 12 33 30 56 30 - 1 0 0 32 3 23 0 45 6 37 182 -35 32 19 32 31 47 19 33 12 17 30 56 14 0 0 0 32 3 35 0 44 56 37 183 -35 32 19 45 31 47 32 33 12 30 30 56 27 1 0 0 32 4 17 0 44 47 37 184 -35 32 20 27 31 48 13 33 13 12 30 57 8 2 0 0 32 5 28 0 44 38 37 186 -35 32 21 38 31 49 23 33 14 24 30 58 17 3 0 0 32 7 7 0 44 29 37 187 -35 32 23 18 31 51 3 33 16 5 30 59 56 4 0 0 32 9 16 0 44 20 37 188 -34 32 25 27 31 53 11 33 18 16 31 2 2 5 0 0 32 11 53 0 44 11 37 189 -34 32 28 5 31 55 48 33 20 56 31 4 38 6 0 0 32 15 0 0 44 1 37 190 -34 32 31 12 31 58 54 33 24 5 31 7 42 7 0 0 32 18 35 0 43 52 36 191 -33 32 34 48 32 2 28 33 27 44 31 11 14 8 0 0 32 22 39 0 43 43 36 192 -33 32 38 53 32 6 32 33 31 52 31 15 15 9 0 0 32 27 12 0 43 34 36 193 -33 32 43 27 32 11 4 33 36 29 31 19 44 10 0 0 32 32 14 0 43 26 36 194 -32 32 48 30 32 16 4 33 41 35 31 24 41 11 0 0 32 37 45 0 43 17 35 195 -32 32 54 2 32 21 34 33 47 11 31 30 7 12 0 0 32 43 44 0 43 8 35 196 -32 33 0 2 32 27 32 33 53 15 31 36 1 13 0 0 32 50 12 0 42 59 35 197 -31 33 6 31 32 33 58 33 59 49 31 42 23 14 0 0 32 57 8 0 42 51 34 198 -31 33 13 29 32 40 53 34 6 51 31 49 14 15 0 0 33 4 32 0 42 42 34 199 -30 33 20 55 32 48 16 34 14 23 31 56 32 16 0 0 33 12 25 0 42 34 33 200 -30 33 28 50 32 56 7 34 22 23 32 4 18 17 0 0 33 20 47 0 42 25 33 201 -29 33 37 13 33 4 27 34 30 52 32 12 33 18 0 0 33 29 36 0 42 17 33 202 -29 33 46 4 33 13 15 34 39 49 32 21 15 19 0 0 33 38 54 0 42 9 32 203 -28 33 55 23 33 22 30 34 49 15 32 30 24 20 0 0 33 48 39 0 42 1 32 204 -28 34 5 11 33 32 13 34 59 10 32 40 1 21 0 0 33 58 52 0 41 53 31 205 -27 34 15 26 33 42 25 35 9 32 32 50 6 22 0 0 34 9 33 0 41 45 31 206 -27 34 26 9 33 53 3 35 20 23 33 0 38 23 0 0 34 20 42 0 41 37 30 207 -26 34 37 20 34 4 9 35 31 42 33 11 37 24 0 0 34 32 17 0 41 29 30 208 -25 34 48 58 34 15 43 35 43 28 33 23 3 25 0 0 34 44 20 0 41 22 29 209 -25 35 1 4 34 27 43 35 55 42 33 34 56 26 0 0 34 56 50 0 41 14 28 210 -24 35 13 37 34 40 11 36 8 23 33 47 15 27 0 0 35 9 47 0 41 7 28 211 -24 35 26 36 34 53 5 36 21 32 34 0 1 28 0 0 35 23 11 0 41 0 27 212 -23 35 40 2 35 6 26 36 35 8 34 13 13 29 0 0 35 37 1 0 40 53 27 212 -22 35 53 55 35 20 13 36 49 11 34 26 52 30 0 0 35 51 17 0 40 46 26 213 -22 36 8 15 35 34 26 37 3 40 34 40 56 31 0 0 36 5 59 0 40 39 25 214 -21 36 23 0 35 49 5 37 18 36 34 55 26 32 0 0 36 21 7 0 40 33 25 215 -20 36 38 11 36 4 10 37 33 57 35 10 21 33 0 0 36 36 40 0 40 27 24 216 -19 36 53 48 36 19 40 37 49 45 35 25 42 34 0 0 36 52 39 0 40 20 23 216 -19 37 9 50 36 35 36 38 5 58 35 41 27 35 0 0 37 9 3 0 40 14 23 217 -18 37 26 16 36 51 56 38 22 37 35 57 37 36 0 0 37 25 51 0 40 8 22 218 -17 37 43 8 37 8 41 38 39 40 36 14 11 37 0 0 37 43 3 0 40 3 21 219 -17 38 0 24 37 25 50 38 57 8 36 31 9 38 0 0 38 0 40 0 39 57 21 220 -16 38 18 4 37 43 22 39 15 1 36 48 31 39 0 0 38 18 40 0 39 52 20 220 -15 38 36 8 38 1 19 39 33 17 37 6 16 40 0 0 38 37 3 0 39 47 19 221 -14 38 54 35 38 19 38 39 51 57 37 24 24 41 0 0 38 55 49 0 39 42 18 222 -14 39 13 25 38 38 20 40 11 0 37 42 54 42 0 0 39 14 57 0 39 37 18 222 -13 39 32 37 38 57 25 40 30 25 38 1 47 43 0 0 39 34 28 0 39 32 17 223 -12 39 52 12 39 16 52 40 50 13 38 21 2 44 0 0 39 54 20 0 39 28 16 224 -11 40 12 8 39 36 40 41 10 23 38 40 38 45 0 0 40 14 33 0 39 24 15 225 -10 40 32 25 39 56 49 41 30 54 39 0 34 46 0 0 40 35 7 0 39 20 15 225 -10 40 53 3 40 17 19 41 51 46 39 20 51 47 0 0 40 56 1 0 39 16 14 226 -9 41 14 1 40 38 8 42 12 58 39 41 29 48 0 0 41 17 14 0 39 13 13 227 -8 41 35 19 40 59 17 42 34 30 40 2 25 49 0 0 41 38 46 0 39 9 12 227 -7 41 56 55 41 20 46 42 56 22 40 23 40 50 0 0 42 0 37 0 39 6 11 228 -6 42 18 51 41 42 32 43 18 31 40 45 14 51 0 0 42 22 46 0 39 3 11 229 -6 42 41 4 42 4 37 43 40 59 41 7 5 52 0 0 42 45 12 0 39 0 10 230 -5 43 3 34 42 26 58 44 3 44 41 29 14 53 0 0 43 7 54 0 38 58 9 230 -4 43 26 21 42 49 37 44 26 46 41 51 39 54 0 0 43 30 53 0 38 56 8 231 -3 43 49 24 43 12 31 44 50 4 42 14 20 55 0 0 43 54 7 0 38 54 8 232 -2 44 12 42 43 35 40 45 13 37 42 37 16 56 0 0 44 17 35 0 38 52 7 232 -2 44 36 15 43 59 5 45 37 25 43 0 27 57 0 0 44 41 17 0 38 50 6 233 -1 45 0 2 44 22 43 46 1 27 43 23 52 Uncertainty in time = +/- 6 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6324-00543-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 50 27.2332 DE: -20 46 40.349 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .051 ) * V mag [mag]: 11.7 * B mag [mag]: 12.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1233) Kobresia approx. diameter [km]: 36 approx. diameter ["]: .035 distance from Earth [AU]: 1.41300 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1259 number of rejected observations: 42 time covered by the observations: 1927 Oct 03 - 2012 Jul 02 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.025, 74° remarks: * orbital elements for (1233) Kobresia : Mean anomaly = 24.89518516 deg Arg. of pericenter = 333.58369313 deg Long. of node = 291.47057228 deg Inclination = 5.60693612 deg Eccentricity = 0.05682830 Semimajor axis = 2.55521909 AU Perihelion dist = 2.41001032 AU Mag: H = 11.53, G = 0.15 Epoch of elements : MJD 56119.03100000 TDT (2012 Jul 11.031) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 11 1233 Kobresia 0h 45.3m UT 11.7 19 50 27.233-20 46 40.35TYC 6324-00543-1 12.3 14.3 36 3.7 1.413 -2.462 0.40 -3.0488 -20.777 170.06 22.07 0.7548 0.00888 0.79400 -5.54645 0.06401 -0.00065 -0.00015 2000 22.7159822012 7 2.00000333.583693291.470572 5.6069360.05682830 2.5552191 2.410010311.3 5.00.15 RATE 2.4130250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.056 0.053 357 2.61 0.056 0 0 2 1 056116.0020120711_0543-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 21:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org