IOTA/IOTA-ES occultation update for (1000) Piazzia / TYC 0245-00638-1 event on 2007 Jul 01, 18:53 UT Visible from Africa Summary ------- On 2007 Jul 01 UT, the 48 km diameter asteroid (1000) Piazzia will occult a 11.1 mag star in the constellation Sextans for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.5 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: 52 * date and approx. time of event: 2007 Jul 01, 18:51 - 2007 Jul 01, 18:56 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 1.5 * Moon: 98 % sunlit, 138° distance * Sun: 55° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 1.22 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .026", 115° ) * approx speed of asteroid's shadow [km/s]: 32.3681 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0245-00638-1 by 1000 Piazzia on 2007 Jul 01 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 -144 0 0 69 20 9 18 51 20 0 85 37 69 2 22 69 38 1 .. .. .. 70 22 0 -143 0 0 69 21 59 18 51 20 1 86 38 69 4 13 69 39 50 .. .. .. 70 23 46 -142 0 0 69 23 35 18 51 20 1 87 38 69 5 50 69 41 26 .. .. .. 70 25 19 -141 0 0 69 24 58 18 51 20 1 88 38 69 7 14 69 42 48 .. .. .. 70 26 40 -140 0 0 69 26 7 18 51 20 2 89 38 69 8 24 69 43 56 .. .. .. 70 27 47 -139 0 0 69 27 3 18 51 20 2 90 39 69 9 20 69 44 52 .. .. .. 70 28 41 -138 0 0 69 27 46 18 51 20 2 91 39 69 10 3 69 45 34 .. .. .. 70 29 22 -137 0 0 69 28 15 18 51 20 3 91 39 69 10 33 69 46 3 .. .. .. 70 29 50 -136 0 0 69 28 31 18 51 20 3 92 39 69 10 48 69 46 18 .. .. .. 70 30 5 -135 0 0 69 28 33 18 51 20 3 93 40 69 10 51 69 46 20 .. .. .. 70 30 7 -134 0 0 69 28 22 18 51 20 4 94 40 69 10 40 69 46 9 .. .. .. 70 29 56 -133 0 0 69 27 58 18 51 20 4 95 40 69 10 15 69 45 45 .. .. .. 70 29 32 -132 0 0 69 27 20 18 51 20 4 96 40 69 9 37 69 45 8 .. .. .. 70 28 56 -131 0 0 69 26 29 18 51 21 5 97 40 69 8 46 69 44 17 .. .. .. 70 28 6 -130 0 0 69 25 24 18 51 21 5 98 41 69 7 40 69 43 13 68 24 46 70 27 3 -129 0 0 69 24 6 18 51 21 5 99 41 69 6 22 69 41 55 68 23 26 70 25 48 -128 0 0 69 22 34 18 51 21 6 100 41 69 4 49 69 40 25 68 21 52 70 24 19 -127 0 0 69 20 49 18 51 21 6 101 41 69 3 3 69 38 40 68 20 3 70 22 37 -126 0 0 69 18 50 18 51 21 7 102 42 69 1 3 69 36 42 68 18 1 70 20 41 -125 0 0 69 16 38 18 51 22 7 103 42 68 58 50 69 34 31 68 15 45 70 18 33 -124 0 0 69 14 11 18 51 22 7 104 42 68 56 22 69 32 6 68 13 14 70 16 11 -123 0 0 69 11 31 18 51 22 8 105 42 68 53 40 69 29 27 68 10 29 70 13 35 -122 0 0 69 8 37 18 51 22 8 106 42 68 50 45 69 26 35 68 7 30 70 10 47 -121 0 0 69 5 29 18 51 22 8 106 43 68 47 35 69 23 28 68 4 17 70 7 44 -120 0 0 69 2 7 18 51 23 9 107 43 68 44 11 69 20 7 68 0 49 70 4 28 -119 0 0 68 58 30 18 51 23 9 108 43 68 40 33 69 16 33 67 57 6 70 0 58 -118 0 0 68 54 39 18 51 23 9 109 43 68 36 40 69 12 44 67 53 8 69 57 14 -117 0 0 68 50 33 18 51 24 10 110 43 68 32 32 69 8 40 67 48 56 69 53 15 -116 0 0 68 46 13 18 51 24 10 111 43 68 28 10 69 4 22 67 44 28 69 49 3 -115 0 0 68 41 38 18 51 24 10 112 44 68 23 33 68 59 50 67 39 46 69 44 36 -114 0 0 68 36 48 18 51 24 11 113 44 68 18 40 68 55 2 67 34 48 69 39 55 -113 0 0 68 31 43 18 51 25 11 114 44 68 13 33 68 50 0 67 29 34 69 34 59 -112 0 0 68 26 23 18 51 25 12 115 44 68 8 10 68 44 42 67 24 5 69 29 48 -111 0 0 68 20 48 18 51 26 12 116 44 68 2 31 68 39 9 67 18 20 69 24 22 -110 0 0 68 14 56 18 51 26 12 117 45 67 56 37 68 33 21 67 12 19 69 18 41 -109 0 0 68 8 49 18 51 26 13 118 45 67 50 27 68 27 17 67 6 2 69 12 44 -108 0 0 68 2 26 18 51 27 13 119 45 67 44 1 68 20 57 66 59 29 69 6 32 -107 0 0 67 55 47 18 51 27 13 120 45 67 37 19 68 14 21 66 52 39 69 0 4 -106 0 0 67 48 51 18 51 28 14 121 45 67 30 20 68 7 28 66 45 32 68 53 20 -105 0 0 67 41 39 18 51 28 14 122 45 67 23 4 68 0 19 66 38 9 68 46 20 -104 0 0 67 34 10 18 51 28 15 123 45 67 15 31 67 52 54 66 30 28 68 39 3 -103 0 0 67 26 23 18 51 29 15 123 46 67 7 42 67 45 11 66 22 29 68 31 29 -102 0 0 67 18 20 18 51 29 15 124 46 66 59 34 67 37 11 66 14 13 68 23 39 -101 0 0 67 9 59 18 51 30 16 125 46 66 51 10 67 28 54 66 5 40 68 15 31 -100 0 0 67 1 20 18 51 31 16 126 46 66 42 27 67 20 19 65 56 48 68 7 6 - 99 0 0 66 52 23 18 51 31 17 127 46 66 33 26 67 11 26 65 47 37 67 58 23 - 98 0 0 66 43 7 18 51 32 17 128 46 66 24 6 67 2 15 65 38 8 67 49 22 - 97 0 0 66 33 33 18 51 32 17 129 46 66 14 28 66 52 45 65 28 21 67 40 3 - 96 0 0 66 23 41 18 51 33 18 130 47 66 4 31 66 42 57 65 18 14 67 30 25 - 95 0 0 66 13 29 18 51 34 18 131 47 65 54 15 66 32 49 65 7 47 67 20 29 - 94 0 0 66 2 57 18 51 34 19 132 47 65 43 39 66 22 22 64 57 1 67 10 13 - 93 0 0 65 52 6 18 51 35 19 133 47 65 32 44 66 11 35 64 45 55 66 59 37 - 92 0 0 65 40 55 18 51 36 20 134 47 65 21 28 66 0 29 64 34 29 66 48 42 - 91 0 0 65 29 24 18 51 36 20 135 47 65 9 52 65 49 2 64 22 42 66 37 27 - 90 0 0 65 17 32 18 51 37 20 136 47 64 57 56 65 37 15 64 10 34 66 25 52 - 89 0 0 65 5 19 18 51 38 21 137 47 64 45 38 65 25 6 63 58 6 66 13 56 - 88 0 0 64 52 44 18 51 39 21 138 47 64 32 59 65 12 37 63 45 15 66 1 38 - 87 0 0 64 39 49 18 51 40 22 139 47 64 19 58 64 59 46 63 32 4 65 49 0 - 86 0 0 64 26 31 18 51 40 22 140 47 64 6 36 64 46 34 63 18 30 65 36 0 - 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2007 May 20 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.018, 132° remarks: * orbital elements for (1000) Piazzia : Mean anomaly = 314.07979832 deg Arg. of pericenter = 281.55190115 deg Long. of node = 323.81913122 deg Inclination = 20.55757583 deg Eccentricity = 0.25490948 Semimajor axis = 3.17524741 AU Perihelion dist = 2.36584673 AU Mag: H = 10.57, G = 0.15 Epoch of elements : MJD 54282.78700000 TDT (2007 Jul 01.787) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 01 1000 Piazzia 18h 53.7m UT 11.1 10 11 28.637 1 59 34.12TYC 0245-00638-1 11.8 15.2 48 1.5 3.203 3.006 -22.05 -50.005 1.999 -102.46 23.09 18.8952 .29973 .61324 16.40951 -8.03132 0.00402 -0.00205 2000 313.5943142007 629.00000281.551901323.819131 20.5575760.254909483.175247412.365846739.6 5 0.15 RATE 1.7419580 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.026 114.5 2.220 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 01:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org