IOTA/IOTA-ES occultation update for (1581) Abanderada / TYC 6842-01336-1 event on 2012 Sep 13, 03:22 UT Visible from Argentina, Chile Summary ------- On 2012 Sep 13 UT, the 37 km diameter asteroid (1581) Abanderada will occult a 9.9 mag star in the constellation Sagittarius for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.5 mag (the magnitude of the asteroid) for at most 3.3 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: 38 * date and approx. time of event: 2012 Sep 13, 03:21 - 2012 Sep 13, 03:30 UT * geocentric midpoint of event [JD]: 2456183.64068333 * magnitude of target star: 9.9 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 3.3 * Moon: 11 % sunlit, 139° distance * Sun: 101° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 1.74 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .031", 91° ) * approx speed of asteroid's shadow [km/s]: 11.1963 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6842-01336-1 by 1581 Abanderada on 2012 Sep 13 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 -145 0 0 -51 58 50 3 21 19 60 27 -1 -52 10 26 -51 47 15 -52 50 58 -51 7 7 -144 0 0 -52 4 51 3 21 25 60 25 -1 -52 16 27 -51 53 18 -52 56 56 -51 13 13 -143 0 0 -52 10 34 3 21 31 60 23 -2 -52 22 8 -51 59 1 -53 2 34 -51 19 0 -142 0 0 -52 15 57 3 21 38 60 21 -3 -52 27 31 -52 4 25 -53 7 53 -51 24 27 -141 0 0 -52 21 2 3 21 44 60 19 -3 -52 32 34 -52 9 30 -53 12 54 -51 29 35 -140 0 0 -52 25 47 3 21 50 60 17 -4 -52 37 19 -52 14 16 -53 17 36 -51 34 24 -139 0 0 -52 30 13 3 21 56 60 16 -4 -52 41 44 -52 18 43 -53 21 59 -51 38 53 -138 0 0 -52 34 21 3 22 3 61 14 -5 -52 45 51 -52 22 52 -53 26 3 -51 43 3 -137 0 0 -52 38 9 3 22 9 61 12 -6 -52 49 39 -52 26 41 -53 29 49 -51 46 55 -136 0 0 -52 41 39 3 22 15 61 10 -6 -52 53 8 -52 30 11 -53 33 16 -51 50 27 -135 0 0 -52 44 50 3 22 21 61 8 -7 -52 56 19 -52 33 23 -53 36 25 -51 53 41 -134 0 0 -52 47 43 3 22 28 61 6 -8 -52 59 11 -52 36 16 -53 39 15 -51 56 35 -133 0 0 -52 50 17 3 22 34 61 4 -8 -53 1 44 -52 38 50 -53 41 47 -51 59 11 -132 0 0 -52 52 32 3 22 40 61 2 -9 -53 3 59 -52 41 6 -53 44 1 -52 1 28 -131 0 0 -52 54 29 3 22 46 61 0 -9 -53 5 56 -52 43 3 -53 45 56 -52 3 26 -130 0 0 -52 56 7 3 22 52 61 358 -10 -53 7 34 -52 44 41 -53 47 33 -52 5 5 -129 0 0 -52 57 26 3 22 58 61 356 -11 -53 8 53 -52 46 1 -53 48 52 -52 6 26 -128 0 0 -52 58 28 3 23 5 61 354 -11 -53 9 54 -52 47 3 -53 49 53 -52 7 28 -127 0 0 -52 59 11 3 23 11 61 352 -12 -53 10 37 -52 47 46 -53 50 35 -52 8 11 -126 0 0 -52 59 35 3 23 17 60 350 -12 -53 11 1 -52 48 10 -53 50 59 -52 8 36 -125 0 0 -52 59 41 3 23 23 60 348 -13 -53 11 7 -52 48 16 -53 51 5 -52 8 42 -124 0 0 -52 59 28 3 23 29 60 347 -14 -53 10 54 -52 48 3 -53 50 52 -52 8 29 -123 0 0 -52 58 57 3 23 35 60 345 -14 -53 10 24 -52 47 32 -53 50 22 -52 7 58 -122 0 0 -52 58 8 3 23 41 60 343 -15 -53 9 34 -52 46 43 -53 49 33 -52 7 8 -121 0 0 -52 57 0 3 23 47 60 341 -15 -53 8 27 -52 45 35 -53 48 26 -52 5 59 -120 0 0 -52 55 34 3 23 53 60 339 -16 -53 7 0 -52 44 8 -53 47 1 -52 4 32 -119 0 0 -52 53 49 3 24 0 59 337 -17 -53 5 16 -52 42 23 -53 45 17 -52 2 45 -118 0 0 -52 51 45 3 24 6 59 336 -17 -53 3 13 -52 40 19 -53 43 16 -52 0 40 -117 0 0 -52 49 24 3 24 12 59 334 -18 -53 0 51 -52 37 57 -53 40 56 -51 58 17 -116 0 0 -52 46 43 3 24 18 59 332 -18 -52 58 11 -52 35 16 -53 38 17 -51 55 34 -115 0 0 -52 43 44 3 24 24 58 330 -19 -52 55 13 -52 32 16 -53 35 20 -51 52 33 -114 0 0 -52 40 26 3 24 30 58 328 -20 -52 51 56 -52 28 58 -53 32 5 -51 49 13 -113 0 0 -52 36 50 3 24 36 58 327 -20 -52 48 20 -52 25 21 -53 28 31 -51 45 34 -112 0 0 -52 32 55 3 24 42 58 325 -21 -52 44 26 -52 21 25 -53 24 39 -51 41 36 -111 0 0 -52 28 41 3 24 48 57 323 -21 -52 40 12 -52 17 11 -53 20 29 -51 37 19 -110 0 0 -52 24 8 3 24 54 57 322 -22 -52 35 40 -52 12 37 -53 15 59 -51 32 43 -109 0 0 -52 19 16 3 25 0 57 320 -23 -52 30 49 -52 7 45 -53 11 11 -51 27 48 -108 0 0 -52 14 6 3 25 6 56 318 -23 -52 25 40 -52 2 33 -53 6 4 -51 22 33 -107 0 0 -52 8 36 3 25 12 56 317 -24 -52 20 11 -51 57 3 -53 0 39 -51 17 0 -106 0 0 -52 2 47 3 25 18 56 315 -24 -52 14 23 -51 51 13 -52 54 54 -51 11 7 -105 0 0 -51 56 39 3 25 24 55 314 -25 -52 8 16 -51 45 4 -52 48 50 -51 4 54 -104 0 0 -51 50 12 3 25 30 55 312 -26 -52 1 50 -51 38 36 -52 42 28 -50 58 23 -103 0 0 -51 43 26 3 25 36 54 311 -26 -51 55 4 -51 31 48 -52 35 46 -50 51 31 -102 0 0 -51 36 20 3 25 42 54 309 -27 -51 47 59 -51 24 41 -52 28 45 -50 44 20 -101 0 0 -51 28 54 3 25 48 54 308 -28 -51 40 35 -51 17 14 -52 21 25 -50 36 50 -100 0 0 -51 21 9 3 25 54 53 306 -28 -51 32 51 -51 9 28 -52 13 45 -50 29 0 - 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85 0 0 -48 44 47 3 27 22 45 287 -37 -48 56 51 -48 32 44 -49 39 3 -47 51 0 - 84 0 0 -48 31 38 3 27 28 45 285 -38 -48 43 43 -48 19 33 -49 26 1 -47 37 43 - 83 0 0 -48 18 7 3 27 34 44 284 -39 -48 30 15 -48 6 1 -49 12 38 -47 24 5 - 82 0 0 -48 4 16 3 27 39 44 283 -39 -48 16 25 -47 52 8 -48 58 55 -47 10 6 - 81 0 0 -47 50 3 3 27 45 43 282 -40 -48 2 14 -47 37 54 -48 44 50 -46 55 46 - 80 0 0 -47 35 30 3 27 51 42 281 -40 -47 47 43 -47 23 19 -48 30 25 -46 41 5 - 79 0 0 -47 20 36 3 27 56 42 280 -41 -47 32 50 -47 8 23 -48 15 38 -46 26 3 - 78 0 0 -47 5 20 3 28 2 41 279 -42 -47 17 36 -46 53 5 -48 0 31 -46 10 40 - 77 0 0 -46 49 44 3 28 8 40 278 -42 -47 2 2 -46 37 27 -47 45 2 -45 54 56 - 76 0 0 -46 33 46 3 28 13 40 277 -43 -46 46 6 -46 21 28 -47 29 13 -45 38 50 - 75 0 0 -46 17 27 3 28 18 39 276 -43 -46 29 49 -46 5 7 -47 13 2 -45 22 24 - 74 0 0 -46 0 48 3 28 24 38 275 -44 -46 13 11 -45 48 26 -46 56 30 -45 5 37 - 73 0 0 -45 43 47 3 28 29 38 274 -45 -45 56 12 -45 31 24 -46 39 38 -44 48 28 - 72 0 0 -45 26 25 3 28 35 37 273 -45 -45 38 52 -45 14 0 -46 22 24 -44 30 59 - 71 0 0 -45 8 43 3 28 40 36 272 -46 -45 21 12 -44 56 16 -46 4 49 -44 13 9 - 70 0 0 -44 50 40 3 28 45 36 271 -46 -45 3 10 -44 38 11 -45 46 54 -43 54 58 - 69 0 0 -44 32 16 3 28 50 35 270 -47 -44 44 48 -44 19 46 -45 28 38 -43 36 27 - 68 0 0 -44 13 31 3 28 56 34 269 -47 -44 26 5 -44 0 59 -45 10 1 -43 17 35 - 67 0 0 -43 54 26 3 29 1 33 268 -48 -44 7 2 -43 41 53 -44 51 3 -42 58 23 - 66 0 0 -43 35 1 3 29 6 33 267 -49 -43 47 38 -43 22 26 -44 31 45 -42 38 50 - 65 0 0 -43 15 16 3 29 11 32 266 -49 -43 27 54 -43 2 39 -44 12 7 -42 18 58 - 64 0 0 -42 55 10 3 29 15 31 265 -50 -43 7 50 -42 42 32 -43 52 9 -41 58 45 - 63 0 0 -42 34 45 3 29 20 30 265 -50 -42 47 27 -42 22 5 -43 31 51 -41 38 13 - 62 0 0 -42 14 0 3 29 25 30 264 -51 -42 26 44 -42 1 19 -43 11 13 -41 17 22 - 61 0 0 -41 52 56 3 29 30 29 263 -51 -42 5 41 -41 40 13 -42 50 16 -40 56 11 - 60 0 0 -41 31 33 3 29 34 28 262 -52 -41 44 19 -41 18 49 -42 28 59 -40 34 42 - 59 0 0 -41 9 51 3 29 39 27 261 -52 -41 22 39 -40 57 5 -42 7 23 -40 12 54 - 58 0 0 -40 47 51 3 29 43 26 260 -53 -41 0 40 -40 35 4 -41 45 29 -39 50 47 - 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Uncertainty in time = +/- 7 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 6842-01336-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 06.9797 DE: -23 41 29.441 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 9.9 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1581) Abanderada approx. diameter [km]: 37 approx. diameter ["]: .018 distance from Earth [AU]: 2.78000 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1353 number of rejected observations: 58 time covered by the observations: 1929 Sep 29 - 2012 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.019, 92° remarks: * orbital elements for (1581) Abanderada : Mean anomaly = 79.89259434 deg Arg. of pericenter = 91.28988330 deg Long. of node = 104.87218589 deg Inclination = 2.53917211 deg Eccentricity = 0.12323310 Semimajor axis = 3.15799405 AU Perihelion dist = 2.76882467 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 56183.14100000 TDT (2012 Sep 13.141) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 13 1581 Abanderada 3h 22.6m UT 9.9 18 8 6.980-23 41 29.44TYC 6842-01336-1 11.0 16.5 37 3.3 2.780 1.454 -0.84 -131.1448 -23.692 128.33 3.66 3.3764 -0.01941 -0.48350 6.31396 -0.26485 0.00567 0.00009 2000 79.3409552012 910.00000 91.289883104.872186 2.5391720.12323310 3.1579941 2.768824710.9 5.00.15 RATE 1.7562530 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.031 91 2.74 0.032 0 0-3-1 056129.0020120913_1336-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org