IOTA/IOTA-ES occultation update for (532) Herculina / TYC 5851-01919-1 event on 2012 Oct 14, 03:09 UT Visible from Africa, Brazil, Argentina, Chile Summary ------- On 2012 Oct 14 UT, the 217 km diameter asteroid (532) Herculina will occult a 11.7 mag star in the constellation Cetus for observers along a path across Africa, Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 10.7 mag (the magnitude of the asteroid) for at most 15.0 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: 99 * date and approx. time of event: 2012 Oct 14, 03:01 - 2012 Oct 14, 03:16 UT * geocentric midpoint of event [JD]: 2456214.63127083 * magnitude of target star: 11.7 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 15.0 * Moon: 3 % sunlit, 151° distance * Sun: 155° distance * rough path description: Africa, Brazil, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 218 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .029", 89° ) * approx speed of asteroid's shadow [km/s]: 14.5005 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5851-01919-1 by 532 Herculina on 2012 Oct 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 -138 0 0 -25 40 9 3 16 12 11 103 -1 -24 39 15 -26 41 9 -24 8 49 -27 11 41 -137 0 0 -25 53 59 3 16 10 12 103 -1 -24 53 10 -26 54 53 -24 22 48 -27 25 23 -136 0 0 -26 7 26 3 16 9 13 103 -2 -25 6 43 -27 8 15 -24 36 24 -27 38 42 -135 0 0 -26 20 31 3 16 7 14 102 -3 -25 19 54 -27 21 15 -24 49 37 -27 51 39 -134 0 0 -26 33 14 3 16 5 14 102 -4 -25 32 42 -27 33 52 -25 2 27 -28 4 13 -133 0 0 -26 45 34 3 16 3 15 101 -5 -25 45 7 -27 46 7 -25 14 55 -28 16 26 -132 0 0 -26 57 31 3 16 2 16 101 -6 -25 57 9 -27 57 59 -25 27 0 -28 28 15 -131 0 0 -27 9 6 3 16 0 17 100 -6 -26 8 49 -28 9 29 -25 38 42 -28 39 43 -130 0 0 -27 20 19 3 15 57 18 100 -7 -26 20 6 -28 20 36 -25 50 2 -28 50 48 -129 0 0 -27 31 8 3 15 55 19 99 -8 -26 31 1 -28 31 21 -26 0 59 -29 1 31 -128 0 0 -27 41 36 3 15 53 20 99 -9 -26 41 33 -28 41 44 -26 11 33 -29 11 51 -127 0 0 -27 51 40 3 15 51 21 98 -10 -26 51 42 -28 51 44 -26 21 44 -29 21 49 -126 0 0 -28 1 23 3 15 48 22 98 -10 -27 1 28 -29 1 22 -26 31 33 -29 31 25 -125 0 0 -28 10 42 3 15 45 23 98 -11 -27 10 52 -29 10 38 -26 40 59 -29 40 38 -124 0 0 -28 19 40 3 15 43 23 97 -12 -27 19 53 -29 19 31 -26 50 2 -29 49 29 -123 0 0 -28 28 14 3 15 40 24 97 -13 -27 28 32 -29 28 2 -26 58 43 -29 57 59 -122 0 0 -28 36 27 3 15 37 25 96 -14 -27 36 48 -29 36 11 -27 7 1 -30 6 5 -121 0 0 -28 44 17 3 15 34 26 96 -14 -27 44 42 -29 43 57 -27 14 56 -30 13 50 -120 0 0 -28 51 45 3 15 31 27 95 -15 -27 52 13 -29 51 22 -27 22 29 -30 21 13 -119 0 0 -28 58 50 3 15 28 28 95 -16 -27 59 22 -29 58 24 -27 29 39 -30 28 13 -118 0 0 -29 5 33 3 15 25 29 94 -17 -28 6 8 -30 5 4 -27 36 27 -30 34 52 -117 0 0 -29 11 54 3 15 22 30 94 -17 -28 12 32 -30 11 22 -27 42 52 -30 41 8 -116 0 0 -29 17 53 3 15 18 30 93 -18 -28 18 33 -30 17 18 -27 48 55 -30 47 3 -115 0 0 -29 23 29 3 15 15 31 93 -19 -28 24 12 -30 22 52 -27 54 35 -30 52 35 -114 0 0 -29 28 43 3 15 11 32 92 -20 -28 29 29 -30 28 3 -27 59 53 -30 57 46 -113 0 0 -29 33 35 3 15 8 33 92 -21 -28 34 23 -30 32 53 -28 4 49 -31 2 35 -112 0 0 -29 38 5 3 15 4 34 91 -21 -28 38 55 -30 37 21 -28 9 22 -31 7 2 -111 0 0 -29 42 13 3 15 0 35 90 -22 -28 43 5 -30 41 27 -28 13 33 -31 11 7 -110 0 0 -29 45 59 3 14 57 36 90 -23 -28 46 53 -30 45 11 -28 17 21 -31 14 50 -109 0 0 -29 49 23 3 14 53 36 89 -24 -28 50 18 -30 48 34 -28 20 47 -31 18 11 -108 0 0 -29 52 25 3 14 49 37 89 -24 -28 53 21 -30 51 34 -28 23 51 -31 21 11 -107 0 0 -29 55 5 3 14 45 38 88 -25 -28 56 3 -30 54 13 -28 26 33 -31 23 49 -106 0 0 -29 57 23 3 14 41 39 88 -26 -28 58 22 -30 56 30 -28 28 53 -31 26 6 -105 0 0 -29 59 19 3 14 36 40 87 -27 -29 0 19 -30 58 25 -28 30 50 -31 28 1 -104 0 0 -30 0 53 3 14 32 41 87 -27 -29 1 54 -30 59 59 -28 32 25 -31 29 34 -103 0 0 -30 2 6 3 14 28 42 86 -28 -29 3 7 -31 1 11 -28 33 39 -31 30 45 -102 0 0 -30 2 56 3 14 24 42 86 -29 -29 3 57 -31 2 1 -28 34 30 -31 31 35 -101 0 0 -30 3 25 3 14 19 43 85 -29 -29 4 26 -31 2 29 -28 34 59 -31 32 4 -100 0 0 -30 3 32 3 14 15 44 85 -30 -29 4 33 -31 2 36 -28 35 6 -31 32 11 - 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2012 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.008, 66° remarks: * orbital elements for (532) Herculina : Mean anomaly = 195.03165469 deg Arg. of pericenter = 76.31497820 deg Long. of node = 107.58324453 deg Inclination = 16.31367258 deg Eccentricity = 0.17749631 Semimajor axis = 2.77081817 AU Perihelion dist = 2.27900818 AU Mag: H = 5.92, G = 0.26 Epoch of elements : MJD 56214.13100000 TDT (2012 Oct 14.131) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 14 532 Herculina 3h 9.0m UT 11.7 1 18 56.898-16 45 39.63TYC 5851-01919-1 12.1 10.7 217 15.0 2.319 -2.056 -9.56 -50.5942 -16.758 129.24 -8.26 3.1505 0.02993 -0.09222 -7.78597 -2.52287 -0.00005 0.00249 2000 194.14888620121010.00000 76.314978107.583245 16.3136730.17749631 2.7708182 2.2790082 5.8 5.00.26 RATE 2.1369380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.029 89 1.25 0.032 0 0 4 3 056208.0020121014_1919-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 18:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org