IOTA/IOTA-ES occultation update for (469) Argentina / UCAC2 45319169 event on 2012 Dec 23, 14:25 UT Visible from NW USA, W Canada, Russia Summary ------- On 2012 Dec 23 UT, the 123 km diameter asteroid (469) Argentina will occult a 11.9 mag star in the constellation Auriga for observers along a path across NW USA, W Canada, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.2 mag (the magnitude of the asteroid) for at most 9.0 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: 95 * date and approx. time of event: 2012 Dec 23, 14:19 - 2012 Dec 23, 14:32 UT * geocentric midpoint of event [JD]: 2456285.10124167 * magnitude of target star: 11.9 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 9.0 * Moon: 80 % sunlit, 51° distance * Sun: 165° distance * rough path description: NW USA, W Canada, Russia The occultation path -------------------- * approximate projected width [km]: 146 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .034", 91° ) * approx speed of asteroid's shadow [km/s]: 13.6659 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 45319169 by 469 Argentina on 2012 Dec 23 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 40 0 0 26 19 1 14 32 12 10 52 0 27 14 15 25 24 33 28 3 31 24 37 13 41 0 0 27 12 15 14 32 10 11 52 -2 28 7 48 26 17 29 28 57 21 25 29 54 42 0 0 28 5 39 14 32 7 13 53 -3 29 1 31 27 10 36 29 51 21 26 22 45 43 0 0 28 59 11 14 32 4 14 53 -4 29 55 20 28 3 50 30 45 27 27 15 45 44 0 0 29 52 46 14 32 1 15 54 -5 30 49 13 28 57 9 31 39 36 28 8 51 45 0 0 30 46 23 14 31 58 16 54 -6 31 43 6 29 50 30 32 33 45 29 1 59 46 0 0 31 39 59 14 31 54 18 55 -7 32 36 58 30 43 51 33 27 51 29 55 7 47 0 0 32 33 31 14 31 51 19 56 -8 33 30 45 31 37 9 34 21 52 30 48 12 48 0 0 33 26 56 14 31 47 20 56 -10 34 24 25 32 30 20 35 15 45 31 41 12 49 0 0 34 20 12 14 31 43 21 57 -11 35 17 53 33 23 23 36 9 26 32 34 4 50 0 0 35 13 15 14 31 39 22 58 -12 36 11 9 34 16 14 37 2 53 33 26 45 51 0 0 36 6 3 14 31 34 23 58 -13 37 4 8 35 8 51 37 56 4 34 19 13 52 0 0 36 58 33 14 31 29 24 59 -14 37 56 49 36 1 11 38 48 54 35 11 25 53 0 0 37 50 42 14 31 25 26 60 -15 38 49 8 36 53 11 39 41 22 36 3 18 54 0 0 38 42 28 14 31 20 27 61 -16 39 41 2 37 44 50 40 33 24 36 54 50 55 0 0 39 33 49 14 31 15 28 61 -17 40 32 30 38 36 3 41 24 59 37 45 58 56 0 0 40 24 41 14 31 9 29 62 -18 41 23 29 39 26 50 42 16 3 38 36 39 57 0 0 41 15 3 14 31 4 30 63 -19 42 13 56 40 17 7 43 6 35 39 26 53 58 0 0 42 4 52 14 30 59 31 64 -20 43 3 49 41 6 53 43 56 31 40 16 36 59 0 0 42 54 7 14 30 53 32 65 -20 43 53 6 41 56 5 44 45 51 41 5 46 60 0 0 43 42 44 14 30 48 33 66 -21 44 41 44 42 44 41 45 34 31 41 54 21 61 0 0 44 30 43 14 30 42 34 67 -22 45 29 43 43 32 40 46 22 30 42 42 20 62 0 0 45 18 1 14 30 36 35 68 -23 46 17 0 44 19 59 47 9 45 43 29 40 63 0 0 46 4 36 14 30 30 36 69 -24 47 3 33 45 6 37 47 56 17 44 16 20 64 0 0 46 50 28 14 30 24 37 70 -25 47 49 21 45 52 32 48 42 2 45 2 18 65 0 0 47 35 35 14 30 19 37 71 -25 48 34 23 46 37 44 49 26 59 45 47 34 66 0 0 48 19 55 14 30 13 38 72 -26 49 18 38 47 22 10 50 11 8 46 32 5 67 0 0 49 3 28 14 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31 13 57 7 27 -138 0 0 58 17 51 14 21 8 36 286 -26 59 12 45 57 23 44 60 1 45 56 36 43 -137 0 0 57 46 54 14 21 4 36 287 -26 58 42 8 56 52 27 59 31 27 56 5 11 -136 0 0 57 15 6 14 21 0 35 289 -25 58 10 40 56 20 21 59 0 17 55 32 48 -135 0 0 56 42 27 14 20 56 34 290 -25 57 38 21 55 47 24 58 28 16 54 59 35 -134 0 0 56 8 57 14 20 52 34 291 -24 57 5 9 55 13 36 57 55 21 54 25 32 -133 0 0 55 34 35 14 20 47 33 292 -23 56 31 5 54 38 56 57 21 33 53 50 38 -132 0 0 54 59 20 14 20 43 32 293 -23 55 56 7 54 3 24 56 46 52 53 14 52 -131 0 0 54 23 12 14 20 39 31 294 -22 55 20 16 53 27 1 56 11 16 52 38 15 -130 0 0 53 46 12 14 20 35 31 295 -21 54 43 32 52 49 45 55 34 46 52 0 46 -129 0 0 53 8 18 14 20 30 30 296 -21 54 5 53 52 11 37 54 57 21 51 22 26 -128 0 0 52 29 32 14 20 26 29 297 -20 53 27 21 51 32 37 54 19 2 50 43 15 -127 0 0 51 49 52 14 20 22 28 298 -19 52 47 55 50 52 45 53 39 48 50 3 12 -126 0 0 51 9 21 14 20 18 27 298 -18 52 7 35 50 12 2 52 59 40 49 22 19 -125 0 0 50 27 57 14 20 14 26 299 -18 51 26 23 49 30 27 52 18 38 48 40 35 -124 0 0 49 45 42 14 20 10 25 300 -17 50 44 18 48 48 2 51 36 42 47 58 2 -123 0 0 49 2 35 14 20 6 25 301 -16 50 1 20 48 4 47 50 53 53 47 14 39 -122 0 0 48 18 39 14 20 2 24 302 -15 49 17 32 47 20 43 50 10 12 46 30 29 -121 0 0 47 33 54 14 19 58 23 303 -14 48 32 53 46 35 51 49 25 39 45 45 32 -120 0 0 46 48 20 14 19 55 22 304 -13 47 47 25 45 50 13 48 40 16 44 59 48 -119 0 0 46 2 0 14 19 51 21 304 -13 47 1 9 45 3 48 47 54 4 44 13 20 -118 0 0 45 14 55 14 19 47 20 305 -12 46 14 7 44 16 40 47 7 4 43 26 9 -117 0 0 44 27 5 14 19 44 19 306 -11 45 26 19 43 28 49 46 19 18 42 38 17 -116 0 0 43 38 34 14 19 41 18 307 -10 44 37 48 42 40 17 45 30 47 41 49 44 -115 0 0 42 49 22 14 19 38 17 308 -9 43 48 36 41 51 6 44 41 34 41 0 33 -114 0 0 41 59 32 14 19 35 15 308 -8 42 58 44 41 1 17 43 51 40 40 10 47 -113 0 0 41 9 6 14 19 32 14 309 -7 42 8 14 40 10 54 43 1 7 39 20 26 -112 0 0 40 18 5 14 19 29 13 310 -6 41 17 9 39 19 58 42 9 58 38 29 33 -111 0 0 39 26 33 14 19 27 12 310 -5 40 25 31 38 28 31 41 18 15 37 38 11 -110 0 0 38 34 32 14 19 25 11 311 -3 39 33 23 37 36 37 40 26 0 36 46 22 -109 0 0 37 42 4 14 19 22 10 312 -2 38 40 47 36 44 16 39 33 16 35 54 8 -108 0 0 36 49 12 14 19 21 9 312 -1 37 47 46 35 51 33 38 40 6 35 1 32 -107 0 0 35 55 59 14 19 19 7 313 0 36 54 22 34 58 30 37 46 33 34 8 37 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: UCAC2 45319169 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 53 30.1705 DE: +38 33 06.710 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .028, .031 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (469) Argentina approx. diameter [km]: 123 approx. diameter ["]: .078 distance from Earth [AU]: 2.17100 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1060 number of rejected observations: 75 time covered by the observations: 1907 Apr 04 - 2012 Dec 04 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 92° remarks: * orbital elements for (469) Argentina : Mean anomaly = 285.17592786 deg Arg. of pericenter = 208.88304902 deg Long. of node = 333.53112948 deg Inclination = 11.58663260 deg Eccentricity = 0.15966697 Semimajor axis = 3.18330964 AU Perihelion dist = 2.67504022 AU Mag: H = 8.62, G = 0.15 Epoch of elements : MJD 56284.60100000 TDT (2012 Dec 23.601) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 23 469 Argentina 14h 25.8m UT 11.9 5 53 30.170 38 33 6.71UCAC2 45319169 0.0 13.2 123 9.0 2.171 -2.640 -4.18 139.3965 38.554 -36.60 -23.42 14.4298 -0.07159 0.53259 -7.64449 -1.02896 0.00039 -0.00156 2000 284.37749620121219.00000208.883049333.531129 11.5866330.15966697 3.1833096 2.6750402 8.6 5.00.15 RATE 1.7353450 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.034 91 1.44 0.035 0 0 5 0 056278.0020121223_319169 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 19:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org