IOTA/IOTA-ES occultation update for (469) Argentina / 2UCAC 45322307 event on 2012 Dec 07, 03:25 UT Visible from Europe, Canada, USA, Mexico Summary ------- On 2012 Dec 07 UT, the 123 km diameter asteroid (469) Argentina will occult a 12.7 mag star in the constellation Auriga for observers along a path across Europe, Canada, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.4 mag (the magnitude of the asteroid) for at most 10.0 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: 97 * date and approx. time of event: 2012 Dec 07, 03:17 - 2012 Dec 07, 03:33 UT * geocentric midpoint of event [JD]: 2456268.6424875 * magnitude of target star: 12.7 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 10.0 * Moon: 45 % sunlit, 81° distance * Sun: 157° distance * rough path description: Europe, Canada, USA, Mexico The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .029", 92° ) * approx speed of asteroid's shadow [km/s]: 12.2954 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 45322307 by 469 Argentina on 2012 Dec 7 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 -138 0 0 14 43 51 3 33 34 1 50 -12 15 28 37 13 59 15 16 2 46 .. .. .. -137 0 0 15 33 1 3 33 34 2 50 -14 16 17 47 14 48 24 16 51 57 14 14 36 -136 0 0 16 22 0 3 33 34 3 51 -15 17 6 47 15 37 23 17 40 56 15 3 35 -135 0 0 17 10 46 3 33 33 4 51 -16 17 55 32 16 26 9 18 29 41 15 52 22 -134 0 0 17 59 18 3 33 32 6 51 -17 18 44 3 17 14 42 19 18 12 16 40 55 -133 0 0 18 47 33 3 33 31 7 51 -18 19 32 17 18 2 59 20 6 24 17 29 13 -132 0 0 19 35 30 3 33 29 8 52 -19 20 20 12 18 50 58 20 54 18 18 17 14 -131 0 0 20 23 7 3 33 27 9 52 -20 21 7 46 19 38 38 21 41 50 19 4 55 -130 0 0 21 10 22 3 33 25 11 53 -22 21 54 58 20 25 56 22 28 59 19 52 16 -129 0 0 21 57 13 3 33 23 12 53 -23 22 41 46 21 12 51 23 15 44 20 39 13 -128 0 0 22 43 39 3 33 21 13 53 -24 23 28 8 21 59 21 24 2 3 21 25 47 -127 0 0 23 29 39 3 33 18 14 54 -25 24 14 3 22 45 25 24 47 54 22 11 54 -126 0 0 24 15 10 3 33 15 15 54 -26 24 59 28 23 31 1 25 33 16 22 57 34 -125 0 0 25 0 11 3 33 12 17 55 -27 25 44 24 24 16 8 26 18 8 23 42 45 -124 0 0 25 44 42 3 33 9 18 55 -28 26 28 49 25 0 44 27 2 28 24 27 26 -123 0 0 26 28 40 3 33 6 19 55 -29 27 12 41 25 44 49 27 46 15 25 11 36 -122 0 0 27 12 5 3 33 2 20 56 -30 27 55 59 26 28 21 28 29 28 25 55 13 -121 0 0 27 54 56 3 32 58 21 56 -31 28 38 43 27 11 19 29 12 6 26 38 16 -120 0 0 28 37 12 3 32 55 22 57 -32 29 20 51 27 53 42 29 54 8 27 20 45 -119 0 0 29 18 51 3 32 51 23 57 -33 30 2 22 28 35 29 30 35 34 28 2 38 -118 0 0 29 59 54 3 32 46 24 58 -34 30 43 17 29 16 40 31 16 22 28 43 55 -117 0 0 30 40 18 3 32 42 25 59 -35 31 23 33 29 57 13 31 56 32 29 24 35 -116 0 0 31 20 5 3 32 38 27 59 -36 32 3 11 30 37 9 32 36 3 30 4 37 -115 0 0 31 59 13 3 32 33 28 60 -37 32 42 9 31 16 25 33 14 54 30 44 0 -114 0 0 32 37 41 3 32 29 29 60 -38 33 20 28 31 55 3 33 53 6 31 22 45 -113 0 0 33 15 30 3 32 24 30 61 -38 33 58 7 32 33 1 34 30 38 32 0 50 -112 0 0 33 52 38 3 32 19 31 62 -39 34 35 6 33 10 19 35 7 29 32 38 16 -111 0 0 34 29 6 3 32 14 32 62 -40 35 11 24 33 46 57 35 43 39 33 15 1 -110 0 0 35 4 54 3 32 9 33 63 -41 35 47 1 34 22 55 36 19 9 33 51 6 -109 0 0 35 40 0 3 32 4 34 63 -42 36 21 58 34 58 12 36 53 57 34 26 31 -108 0 0 36 14 26 3 31 59 35 64 -43 36 56 13 35 32 48 37 28 4 35 1 15 -107 0 0 36 48 10 3 31 54 36 65 -43 37 29 47 36 6 43 38 1 30 35 35 18 -106 0 0 37 21 14 3 31 49 36 66 -44 38 2 40 36 39 57 38 34 15 36 8 40 -105 0 0 37 53 37 3 31 43 37 66 -45 38 34 52 37 12 30 39 6 19 36 41 21 -104 0 0 38 25 19 3 31 38 38 67 -46 39 6 23 37 44 23 39 37 42 37 13 22 -103 0 0 38 56 20 3 31 33 39 68 -46 39 37 13 38 15 35 40 8 24 37 44 42 -102 0 0 39 26 40 3 31 27 40 69 -47 40 7 23 38 46 6 40 38 25 38 15 22 -101 0 0 39 56 21 3 31 22 41 69 -48 40 36 52 39 15 57 41 7 46 38 45 21 -100 0 0 40 25 21 3 31 16 42 70 -48 41 5 41 39 45 8 41 36 27 39 14 40 - 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2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 96° remarks: * orbital elements for (469) Argentina : Mean anomaly = 282.35926250 deg Arg. of pericenter = 208.83906648 deg Long. of node = 333.54051735 deg Inclination = 11.58578243 deg Eccentricity = 0.15970873 Semimajor axis = 3.18365409 AU Perihelion dist = 2.67519673 AU Mag: H = 8.62, G = 0.15 Epoch of elements : MJD 56268.14300000 TDT (2012 Dec 07.143) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 7 469 Argentina 3h 25.2m UT 12.7 6 10 19.902 38 39 12.292UCAC 45322307 0.0 13.4 123 10.0 2.223 -2.338 2.16 -35.0224 38.653 126.58 -22.64 3.4197 0.01850 0.23715 -6.91821 0.54751 -0.00181 -0.00148 2000 280.94640020121129.00000208.839066333.540517 11.5857820.15970873 3.1836541 2.6751967 8.6 5.00.15 RATE 1.7350630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.029 92 1.38 0.029 0 0 0 3 056264.0020121207_322307 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org