IOTA/IOTA-ES occultation update for (1327) Namaqua / HIP 62733 event on 2007 Aug 01, 22:06 UT Visible from Brazil Summary ------- On 2007 Aug 01 UT, the 25 km diameter asteroid (1327) Namaqua will occult a 9.7 mag star in the constellation Virgo for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.2 mag to 17.9 mag (the magnitude of the asteroid) for at most 0.9 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: 28 * date and approx. time of event: 2007 Aug 01, 22:02 - 2007 Aug 01, 22:10 UT * midpoint of event [JD]: 2454314.42104167 * magnitude of target star: 9.7 * magnitude drop [mag]: 8.2 * estimated maximum duration [s]: 0.9 * Moon: 89 % sunlit, 154° distance * Sun: 64° distance * rough path description: Brazil The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 2.38 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .026", 113° ) * approx speed of asteroid's shadow [km/s]: 28.3673 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 62733 by 1327 Namaqua on 2007 Aug 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 -176 0 0 20 17 53 22 2 35 1 93 64 20 11 3 20 24 44 19 38 26 20 57 17 -175 0 0 20 14 12 22 2 35 2 94 65 20 7 21 20 21 3 19 34 43 20 53 37 -174 0 0 20 10 2 22 2 36 3 94 66 20 3 11 20 16 54 19 30 32 20 49 29 -173 0 0 20 5 25 22 2 36 4 94 67 19 58 33 20 12 16 19 25 53 20 44 53 -172 0 0 20 0 19 22 2 36 4 95 68 19 53 27 20 7 11 19 20 46 20 39 49 -171 0 0 19 54 45 22 2 36 5 95 69 19 47 53 20 1 38 19 15 10 20 34 17 -170 0 0 19 48 44 22 2 37 6 95 70 19 41 51 19 55 36 19 9 6 20 28 17 -169 0 0 19 42 13 22 2 37 7 96 71 19 35 20 19 49 6 19 2 33 20 21 50 -168 0 0 19 35 15 22 2 38 8 96 72 19 28 22 19 42 8 18 55 33 20 14 54 -167 0 0 19 27 48 22 2 38 9 96 73 19 20 55 19 34 42 18 48 3 20 7 29 -166 0 0 19 19 53 22 2 39 10 97 74 19 12 59 19 26 47 18 40 6 19 59 37 -165 0 0 19 11 30 22 2 40 11 97 75 19 4 35 19 18 25 18 31 39 19 51 17 -164 0 0 19 2 38 22 2 40 12 97 76 18 55 43 19 9 34 18 22 45 19 42 28 -163 0 0 18 53 18 22 2 41 13 98 77 18 46 22 19 0 14 18 13 21 19 33 11 -162 0 0 18 43 30 22 2 42 14 98 78 18 36 33 18 50 26 18 3 30 19 23 26 -161 0 0 18 33 13 22 2 43 15 98 79 18 26 16 18 40 10 17 53 9 19 13 13 -160 0 0 18 22 27 22 2 44 16 99 80 18 15 30 18 29 25 17 42 20 19 2 31 -159 0 0 18 11 13 22 2 45 17 99 80 18 4 15 18 18 12 17 31 2 18 51 21 -158 0 0 17 59 31 22 2 46 18 99 81 17 52 32 18 6 30 17 19 16 18 39 42 -157 0 0 17 47 20 22 2 47 19 100 82 17 40 20 17 54 20 17 7 1 18 27 35 -156 0 0 17 34 40 22 2 49 20 100 83 17 27 40 17 41 41 16 54 17 18 15 0 -155 0 0 17 21 32 22 2 50 21 100 84 17 14 31 17 28 33 16 41 5 18 1 56 -154 0 0 17 7 56 22 2 52 22 100 85 17 0 54 17 14 58 16 27 24 17 48 24 -153 0 0 16 53 51 22 2 53 23 101 86 16 46 48 17 0 53 16 13 14 17 34 23 -152 0 0 16 39 17 22 2 55 24 101 87 16 32 13 16 46 20 15 58 36 17 19 54 -151 0 0 16 24 15 22 2 56 25 101 87 16 17 10 16 31 19 15 43 29 17 4 57 -150 0 0 16 8 44 22 2 58 26 101 88 16 1 39 16 15 49 15 27 53 16 49 31 -149 0 0 15 52 45 22 3 0 27 102 87 15 45 39 15 59 51 15 11 49 16 33 37 -148 0 0 15 36 18 22 3 1 28 102 87 15 29 11 15 43 24 14 55 17 16 17 14 -147 0 0 15 19 22 22 3 3 29 102 86 15 12 14 15 26 30 14 38 16 16 0 24 -146 0 0 15 1 58 22 3 5 30 102 86 14 54 49 15 9 6 14 20 46 15 43 5 -145 0 0 14 44 6 22 3 7 31 103 85 14 36 56 14 51 15 14 2 49 15 25 18 -144 0 0 14 25 45 22 3 10 32 103 84 14 18 35 14 32 56 13 44 23 15 7 3 -143 0 0 14 6 57 22 3 12 33 103 83 13 59 45 14 14 8 13 25 29 14 48 20 -142 0 0 13 47 41 22 3 14 34 103 82 13 40 28 13 54 53 13 6 7 14 29 10 -141 0 0 13 27 57 22 3 16 35 103 81 13 20 43 13 35 10 12 46 18 14 9 31 -140 0 0 13 7 45 22 3 19 36 103 80 13 0 31 13 15 0 12 26 1 13 49 26 -139 0 0 12 47 6 22 3 21 37 104 79 12 39 51 12 54 22 12 5 16 13 28 52 -138 0 0 12 26 0 22 3 24 38 104 78 12 18 44 12 33 17 11 44 4 13 7 52 -137 0 0 12 4 27 22 3 26 39 104 77 11 57 9 12 11 44 11 22 25 12 46 25 -136 0 0 11 42 27 22 3 29 40 104 76 11 35 8 11 49 45 11 0 19 12 24 30 -135 0 0 11 20 0 22 3 32 41 104 75 11 12 41 11 27 20 10 37 46 12 2 10 -134 0 0 10 57 7 22 3 34 42 104 74 10 49 47 11 4 28 10 14 47 11 39 22 -133 0 0 10 33 48 22 3 37 43 104 73 10 26 26 10 41 10 9 51 22 11 16 9 -132 0 0 10 10 3 22 3 40 44 104 71 10 2 40 10 17 26 9 27 31 10 52 30 -131 0 0 9 45 53 22 3 43 45 104 70 9 38 29 9 53 16 9 3 15 10 28 26 -130 0 0 9 21 17 22 3 46 47 104 69 9 13 53 9 28 42 8 38 34 10 3 56 -129 0 0 8 56 17 22 3 49 48 104 68 8 48 51 9 3 43 8 13 27 9 39 2 -128 0 0 8 30 52 22 3 53 49 104 67 8 23 26 8 38 19 7 47 57 9 13 43 -127 0 0 8 5 4 22 3 56 50 104 66 7 57 36 8 12 31 7 22 2 8 48 0 -126 0 0 7 38 52 22 3 59 51 104 65 7 31 23 7 46 20 6 55 44 8 21 54 -125 0 0 7 12 16 22 4 3 52 104 64 7 4 47 7 19 46 6 29 3 7 55 24 -124 0 0 6 45 18 22 4 6 53 104 63 6 37 48 6 52 49 6 2 0 7 28 32 -123 0 0 6 17 59 22 4 10 54 104 62 6 10 27 6 25 30 5 34 34 7 1 18 -122 0 0 5 50 17 22 4 13 55 104 61 5 42 44 5 57 50 5 6 47 6 33 42 -121 0 0 5 22 15 22 4 17 56 103 59 5 14 41 5 29 48 4 38 40 6 5 45 -120 0 0 4 53 52 22 4 20 57 103 58 4 46 17 5 1 26 4 10 11 5 37 27 -119 0 0 4 25 9 22 4 24 58 103 57 4 17 34 4 32 44 3 41 24 5 8 49 -118 0 0 3 56 7 22 4 28 60 103 56 3 48 31 4 3 43 3 12 17 4 39 53 -117 0 0 3 26 47 22 4 32 61 102 55 3 19 10 3 34 24 2 42 52 4 10 37 -116 0 0 2 57 9 22 4 36 62 102 54 2 49 31 3 4 47 2 13 9 3 41 4 -115 0 0 2 27 14 22 4 40 63 101 53 2 19 35 2 34 52 1 43 9 3 11 14 -114 0 0 1 57 2 22 4 44 64 101 52 1 49 23 2 4 42 1 12 53 2 41 7 -113 0 0 1 26 35 22 4 48 65 100 50 1 18 55 1 34 16 0 42 22 2 10 44 -112 0 0 0 55 54 22 4 52 66 99 49 0 48 13 1 3 35 0 11 36 1 40 6 -111 0 0 0 24 58 22 4 56 67 99 48 0 17 16 0 32 40 - 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2007 May 09 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.022, 118° remarks: * orbital elements for (1327) Namaqua : Mean anomaly = 262.22676942 deg Arg. of pericenter = 268.55371773 deg Long. of node = 58.09390739 deg Inclination = 5.82182693 deg Eccentricity = 0.16389323 Semimajor axis = 2.77893029 AU Perihelion dist = 2.32348243 AU Mag: H = 12.01, G = 0.15 Epoch of elements : MJD 54313.92100000 TDT (2007 Aug 01.921) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 1327 Namaqua 22h 6.3m UT 9.7 12 51 18.227- 2 54 0.37HIP 62733 10.9 17.9 25 0.9 3.212 2.590 -20.39 -88.882 -2.895 -149.99 17.93 22.1050 -.06100 -.11494 14.17336 -7.44830 0.00465 -0.00185 2000 261.3925412007 729.00000268.553718 58.093907 5.8218270.163893232.778930292.3234824312.15 0.15 RATE 2.1275880 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.032 0.026 113.3 3.380 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 08, 22:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org