IOTA/IOTA-ES occultation update for (1233) Kobresia / TYC 6304-01817-1 event on 2012 Sep 14, 03:03 UT Visible from Brazil, Peru Summary ------- On 2012 Sep 14 UT, the 36 km diameter asteroid (1233) Kobresia will occult a 10.0 mag star in the constellation Sagittarius for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.6 mag (the magnitude of the asteroid) for at most 6.8 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: 44 * date and approx. time of event: 2012 Sep 14, 02:54 - 2012 Sep 14, 03:23 UT * geocentric midpoint of event [JD]: 2456184.6275875 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 6.8 * Moon: 5 % sunlit, 142° distance * Sun: 117° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 1.47 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .034", 358° ) * approx speed of asteroid's shadow [km/s]: 5.2735 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6304-01817-1 by 1233 Kobresia on 2012 Sep 14 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 -136 0 0 -32 20 28 2 54 19 61 71 -1 -32 30 21 -32 10 35 -32 59 25 -31 41 34 -135 0 0 -32 13 32 2 54 36 62 71 -2 -32 23 26 -32 3 39 -32 52 32 -31 34 35 -134 0 0 -32 6 8 2 54 53 63 70 -2 -32 16 2 -31 56 14 -32 45 11 -31 27 7 -133 0 0 -31 58 15 2 55 11 64 69 -3 -32 8 10 -31 48 20 -32 37 21 -31 19 12 -132 0 0 -31 49 54 2 55 29 65 68 -4 -31 59 50 -31 39 58 -32 29 4 -31 10 48 -131 0 0 -31 41 5 2 55 46 66 67 -5 -31 51 2 -31 31 8 -32 20 18 -31 1 55 -130 0 0 -31 31 47 2 56 5 67 65 -6 -31 41 45 -31 21 49 -32 11 4 -30 52 33 -129 0 0 -31 22 0 2 56 23 68 64 -7 -31 31 59 -31 12 2 -32 1 21 -30 42 42 -128 0 0 -31 11 45 2 56 41 68 63 -8 -31 21 45 -31 1 45 -31 51 10 -30 32 23 -127 0 0 -31 1 1 2 57 0 69 62 -9 -31 11 2 -30 51 0 -31 40 30 -30 21 34 -126 0 0 -30 49 47 2 57 19 70 61 -10 -30 59 49 -30 39 45 -31 29 21 -30 10 16 -125 0 0 -30 38 5 2 57 38 71 59 -11 -30 48 8 -30 28 2 -31 17 43 -29 58 29 -124 0 0 -30 25 53 2 57 57 72 58 -12 -30 35 58 -30 15 49 -31 5 36 -29 46 13 -123 0 0 -30 13 12 2 58 16 73 56 -13 -30 23 18 -30 3 7 -30 53 0 -29 33 27 -122 0 0 -30 0 2 2 58 36 74 54 -14 -30 10 9 -29 49 55 -30 39 55 -29 20 12 -121 0 0 -29 46 23 2 58 56 75 52 -15 -29 56 31 -29 36 14 -30 26 21 -29 6 27 -120 0 0 -29 32 13 2 59 16 76 50 -15 -29 42 23 -29 22 4 -30 12 17 -28 52 12 -119 0 0 -29 17 35 2 59 36 76 48 -16 -29 27 46 -29 7 24 -29 57 44 -28 37 28 -118 0 0 -29 2 26 2 59 56 77 45 -17 -29 12 39 -28 52 14 -29 42 41 -28 22 14 -117 0 0 -28 46 48 3 0 17 78 43 -18 -28 57 3 -28 36 34 -29 27 9 -28 6 30 -116 0 0 -28 30 41 3 0 37 79 39 -19 -28 40 56 -28 20 25 -29 11 8 -27 50 17 -115 0 0 -28 14 3 3 0 58 80 36 -20 -28 24 21 -28 3 46 -28 54 36 -27 33 33 -114 0 0 -27 56 56 3 1 19 80 31 -21 -28 7 15 -27 46 38 -28 37 36 -27 16 20 -113 0 0 -27 39 20 3 1 40 81 26 -22 -27 49 40 -27 28 59 -28 20 5 -26 58 37 -112 0 0 -27 21 13 3 2 1 82 21 -23 -27 31 35 -27 10 51 -28 2 5 -26 40 24 -111 0 0 -27 2 37 3 2 23 82 14 -24 -27 13 1 -26 52 14 -27 43 35 -26 21 42 -110 0 0 -26 43 32 3 2 44 83 6 -25 -26 53 57 -26 33 7 -27 24 36 -26 2 30 -109 0 0 -26 23 57 3 3 6 83 357 -26 -26 34 23 -26 13 30 -27 5 8 -25 42 48 -108 0 0 -26 3 52 3 3 28 83 348 -27 -26 14 21 -25 53 24 -26 45 10 -25 22 37 -107 0 0 -25 43 18 3 3 50 83 338 -28 -25 53 49 -25 32 48 -26 24 43 -25 1 56 -106 0 0 -25 22 15 3 4 12 83 328 -29 -25 32 47 -25 11 43 -26 3 47 -24 40 47 -105 0 0 -25 0 43 3 4 34 83 319 -30 -25 11 17 -24 50 10 -25 42 22 -24 19 8 -104 0 0 -24 38 43 3 4 56 83 311 -32 -24 49 18 -24 28 7 -25 20 28 -23 57 1 -103 0 0 -24 16 14 3 5 19 82 303 -33 -24 26 51 -24 5 37 -24 58 6 -23 34 25 -102 0 0 -23 53 16 3 5 41 81 297 -34 -24 3 55 -23 42 37 -24 35 15 -23 11 20 -101 0 0 -23 29 50 3 6 4 81 292 -35 -23 40 31 -23 19 10 -24 11 56 -22 47 48 -100 0 0 -23 5 57 3 6 26 80 287 -36 -23 16 40 -22 55 15 -23 48 9 -22 23 48 - 99 0 0 -22 41 37 3 6 49 79 283 -37 -22 52 21 -22 30 53 -23 23 56 -21 59 21 - 98 0 0 -22 16 49 3 7 12 78 280 -38 -22 27 35 -22 6 3 -22 59 14 -21 34 27 - 97 0 0 -21 51 35 3 7 35 77 277 -39 -22 2 22 -21 40 47 -22 34 7 -21 9 6 - 96 0 0 -21 25 54 3 7 58 76 274 -40 -21 36 43 -21 15 5 -22 8 33 -20 43 19 - 95 0 0 -20 59 48 3 8 20 75 272 -41 -21 10 39 -20 48 57 -21 42 33 -20 17 6 - 94 0 0 -20 33 17 3 8 43 74 270 -42 -20 44 9 -20 22 24 -21 16 8 -19 50 29 - 93 0 0 -20 6 21 3 9 6 73 268 -43 -20 17 14 -19 55 27 -20 49 18 -19 23 27 - 92 0 0 -19 39 0 3 9 29 72 266 -45 -19 49 56 -19 28 5 -20 22 4 -18 56 1 - 91 0 0 -19 11 17 3 9 52 71 265 -46 -19 22 14 -19 0 20 -19 54 26 -18 28 11 - 90 0 0 -18 43 11 3 10 14 70 263 -47 -18 54 9 -18 32 13 -19 26 26 -17 59 59 - 89 0 0 -18 14 42 3 10 37 69 262 -48 -18 25 42 -18 3 43 -18 58 3 -17 31 25 - 88 0 0 -17 45 52 3 11 0 68 261 -49 -17 56 53 -17 34 52 -18 29 18 -17 2 30 - 87 0 0 -17 16 42 3 11 22 67 260 -50 -17 27 44 -17 5 40 -18 0 13 -16 33 15 - 86 0 0 -16 47 12 3 11 45 66 259 -51 -16 58 15 -16 36 9 -17 30 48 -16 3 40 - 85 0 0 -16 17 23 3 12 7 64 258 -52 -16 28 27 -16 6 18 -17 1 3 -15 33 46 - 84 0 0 -15 47 15 3 12 29 63 257 -54 -15 58 21 -15 36 10 -16 31 1 -15 3 35 - 83 0 0 -15 16 51 3 12 51 62 256 -55 -15 27 58 -15 5 44 -16 0 40 -14 33 6 - 82 0 0 -14 46 10 3 13 13 61 256 -56 -14 57 18 -14 35 3 -15 30 4 -14 2 22 - 81 0 0 -14 15 14 3 13 35 60 255 -57 -14 26 23 -14 4 6 -14 59 11 -13 31 22 - 80 0 0 -13 44 4 3 13 56 59 254 -58 -13 55 14 -13 32 55 -14 28 4 -13 0 8 - 79 0 0 -13 12 41 3 14 18 58 254 -59 -13 23 51 -13 1 30 -13 56 44 -12 28 42 - 78 0 0 -12 41 5 3 14 39 56 253 -61 -12 52 16 -12 29 54 -13 25 11 -11 57 3 - 77 0 0 -12 9 18 3 14 59 55 253 -62 -12 20 30 -11 58 6 -12 53 26 -11 25 14 - 76 0 0 -11 37 21 3 15 20 54 252 -63 -11 48 33 -11 26 9 -12 21 32 -10 53 15 - 75 0 0 -11 5 15 3 15 40 53 252 -64 -11 16 27 -10 54 2 -11 49 27 -10 21 7 - 74 0 0 -10 33 1 3 16 0 52 251 -65 -10 44 14 -10 21 48 -11 17 15 - 9 48 51 - 73 0 0 -10 0 40 3 16 20 51 251 -66 -10 11 53 - 9 49 27 -10 44 55 - 9 16 29 - 72 0 0 - 9 28 14 3 16 39 49 251 -68 - 9 39 27 - 9 17 0 -10 12 30 - 8 44 2 - 71 0 0 - 8 55 43 3 16 59 48 250 -69 - 9 6 57 - 8 44 29 - 9 40 0 - 8 11 31 - 70 0 0 - 8 23 9 3 17 17 47 250 -70 - 8 34 23 - 8 11 55 - 9 7 26 - 7 38 56 - 69 0 0 - 7 50 32 3 17 36 46 250 -71 - 8 1 46 - 7 39 19 - 8 34 50 - 7 6 20 - 68 0 0 - 7 17 55 3 17 54 45 249 -72 - 7 29 9 - 7 6 41 - 8 2 12 - 6 33 43 - 67 0 0 - 6 45 18 3 18 11 43 249 -73 - 6 56 31 - 6 34 4 - 7 29 34 - 6 1 6 - 66 0 0 - 6 12 42 3 18 29 42 249 -75 - 6 23 55 - 6 1 28 - 6 56 57 - 5 28 31 - 65 0 0 - 5 40 8 3 18 45 41 249 -76 - 5 51 21 - 5 28 55 - 6 24 22 - 4 55 59 - 64 0 0 - 5 7 38 3 19 2 40 248 -77 - 5 18 51 - 4 56 25 - 5 51 50 - 4 23 30 - 63 0 0 - 4 35 12 3 19 18 39 248 -78 - 4 46 25 - 4 24 0 - 5 19 23 - 3 51 7 - 62 0 0 - 4 2 52 3 19 33 38 248 -79 - 4 14 4 - 3 51 41 - 4 47 1 - 3 18 49 - 61 0 0 - 3 30 39 3 19 49 36 248 -80 - 3 41 50 - 3 19 28 - 4 14 45 - 2 46 38 - 60 0 0 - 2 58 34 3 20 3 35 248 -81 - 3 9 44 - 2 47 24 - 3 42 37 - 2 14 36 - 59 0 0 - 2 26 37 3 20 17 34 248 -82 - 2 37 47 - 2 15 28 - 3 10 38 - 1 42 42 - 58 0 0 - 1 54 50 3 20 31 33 248 -83 - 2 5 59 - 1 43 42 - 2 38 48 - 1 10 58 - 57 0 0 - 1 23 14 3 20 45 32 248 -84 - 1 34 22 - 1 12 7 - 2 7 9 - 0 39 26 - 56 0 0 - 0 51 50 3 20 57 30 247 -85 - 1 2 57 - 0 40 43 - 1 35 41 - 0 8 5 - 55 0 0 - 0 20 38 3 21 10 29 247 -85 - 0 31 44 - 0 9 33 - 1 4 25 0 23 3 - 54 0 0 0 10 20 3 21 22 28 247 -86 - 0 0 45 0 21 25 - 0 33 23 0 53 57 - 53 0 0 0 41 4 3 21 33 27 247 -86 0 30 0 0 52 7 - 0 2 35 1 24 37 - 52 0 0 1 11 32 3 21 44 26 247 -86 1 0 30 1 22 35 0 27 58 1 55 1 - 51 0 0 1 41 45 3 21 54 25 247 -85 1 30 43 1 52 47 0 58 16 2 25 9 - 50 0 0 2 11 41 3 22 4 23 247 -84 2 0 41 2 22 41 1 28 17 2 55 0 - 49 0 0 2 41 20 3 22 14 22 247 -83 2 30 20 2 52 19 1 58 0 3 24 34 - 48 0 0 3 10 40 3 22 23 21 247 -83 2 59 42 3 21 38 2 27 25 3 53 49 - 47 0 0 3 39 42 3 22 31 20 247 -82 3 28 45 3 50 38 2 56 32 4 22 46 - 46 0 0 4 8 24 3 22 39 19 248 -81 3 57 28 4 19 19 3 25 20 4 51 23 - 45 0 0 4 36 46 3 22 47 18 248 -80 4 25 52 4 47 40 3 53 47 5 19 39 - 44 0 0 5 4 48 3 22 54 17 248 -79 4 53 55 5 15 40 4 21 54 5 47 36 - 43 0 0 5 32 28 3 23 1 16 248 -78 5 21 37 5 43 19 4 49 40 6 15 10 - 42 0 0 5 59 47 3 23 7 14 248 -76 5 48 57 6 10 36 5 17 5 6 42 24 - 41 0 0 6 26 44 3 23 12 13 248 -75 6 15 55 6 37 32 5 44 7 7 9 15 - 40 0 0 6 53 18 3 23 18 12 248 -74 6 42 31 7 4 4 6 10 47 7 35 43 - 39 0 0 7 19 29 3 23 22 11 248 -73 7 8 44 7 30 14 6 37 4 8 1 49 - 38 0 0 7 45 17 3 23 27 10 248 -72 7 34 33 7 56 1 7 2 58 8 27 31 - 37 0 0 8 10 41 3 23 30 9 248 -71 7 59 59 8 21 23 7 28 28 8 52 49 - 36 0 0 8 35 42 3 23 34 8 249 -70 8 25 1 8 46 22 7 53 34 9 17 44 - 35 0 0 9 0 18 3 23 37 7 249 -69 8 49 38 9 10 57 8 18 16 9 42 14 - 34 0 0 9 24 29 3 23 39 6 249 -68 9 13 51 9 35 7 8 42 34 10 6 20 - 33 0 0 9 48 16 3 23 41 5 249 -67 9 37 39 9 58 52 9 6 26 10 30 1 - 32 0 0 10 11 37 3 23 43 4 249 -66 10 1 2 10 22 12 9 29 54 10 53 16 - 31 0 0 10 34 34 3 23 44 2 249 -65 10 24 0 10 45 7 9 52 56 11 16 7 - 30 0 0 10 57 5 3 23 45 1 250 -64 10 46 33 11 7 36 10 15 32 11 38 32 - 29 0 0 11 19 10 3 23 45 0 250 -63 11 8 39 11 29 40 10 37 44 12 0 32 Uncertainty in time = +/- 10 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6304-01817-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 19 03.5202 DE: -19 45 58.247 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .038 ) * V mag [mag]: 10.0 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1233) Kobresia approx. diameter [km]: 36 approx. diameter ["]: .027 distance from Earth [AU]: 1.82100 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1273 number of rejected observations: 42 time covered by the observations: 1927 Oct 03 - 2012 Aug 09 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.014, 75° remarks: * orbital elements for (1233) Kobresia : Mean anomaly = 40.64421415 deg Arg. of pericenter = 333.54396269 deg Long. of node = 291.47098813 deg Inclination = 5.60717990 deg Eccentricity = 0.05675890 Semimajor axis = 2.55500465 AU Perihelion dist = 2.40998541 AU Mag: H = 11.53, G = 0.15 Epoch of elements : MJD 56184.12700000 TDT (2012 Sep 14.127) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 14 1233 Kobresia 3h 3.7m UT 10.0 19 19 3.520-19 45 58.25TYC 6304-01817-1 12.1 15.6 36 6.8 1.821 0.967 4.53 -109.6676 -19.768 132.96 3.29 3.0621 0.03439 -0.10347 2.82491 0.93783 0.00493 0.00056 2000 39.6482332012 910.00000333.543963291.470988 5.6071800.05675890 2.5550047 2.409985411.3 5.00.15 RATE 2.4133290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.034 358 2.47 0.040 0 0 2 3 056165.0020120914_1817-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org