IOTA/IOTA-ES occultation update for (478) Tergeste / 2UCAC 35746574 event on 2007 Oct 04, 11:10 UT Visible from S USA, N Mexico Summary ------- On 2007 Oct 04 UT, the 79 km diameter asteroid (478) Tergeste will occult a 11.8 mag star in the constellation Cancer for observers along a path across S USA, N Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.5 mag (the magnitude of the asteroid) for at most 2.8 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: 81 * date and approx. time of event: 2007 Oct 04, 11:07 - 2007 Oct 04, 11:14 UT * midpoint of event [JD]: 2454377.96602083 * magnitude of target star: 11.8 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 2.8 * Moon: 39 % sunlit, 14° distance * Sun: 70° distance * rough path description: S USA, N Mexico The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .024", 97° ) * approx speed of asteroid's shadow [km/s]: 28.1862 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 35746574 by 478 Tergeste on 2007 Oct 04 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 -154 0 0 28 37 23 11 7 18 0 78 -62 28 15 26 28 59 21 27 46 28 29 28 22 -153 0 0 28 48 51 11 7 18 1 78 -61 28 26 56 29 10 47 27 58 1 29 39 44 -152 0 0 28 59 53 11 7 19 2 79 -60 28 38 0 29 21 47 28 9 8 29 50 42 -151 0 0 29 10 31 11 7 19 3 79 -60 28 48 40 29 32 22 28 19 50 30 1 15 -150 0 0 29 20 43 11 7 19 4 80 -59 28 58 53 29 42 32 28 30 6 30 11 22 -149 0 0 29 30 29 11 7 19 5 80 -58 29 8 42 29 52 17 28 39 57 30 21 5 -148 0 0 29 39 51 11 7 20 6 81 -57 29 18 5 30 1 37 28 49 23 30 30 22 -147 0 0 29 48 47 11 7 20 7 81 -57 29 27 3 30 10 32 28 58 23 30 39 15 -146 0 0 29 57 19 11 7 20 7 82 -56 29 35 36 30 19 1 29 6 58 30 47 42 -145 0 0 30 5 25 11 7 21 8 82 -55 29 43 44 30 27 6 29 15 8 30 55 44 -144 0 0 30 13 5 11 7 21 9 83 -55 29 51 26 30 34 45 29 22 52 31 3 22 -143 0 0 30 20 21 11 7 22 10 83 -54 29 58 43 30 41 59 29 30 11 31 10 34 -142 0 0 30 27 12 11 7 23 11 84 -53 30 5 35 30 48 49 29 37 5 31 17 22 -141 0 0 30 33 37 11 7 23 12 84 -52 30 12 2 30 55 13 29 43 34 31 23 44 -140 0 0 30 39 38 11 7 24 13 85 -52 30 18 4 31 1 12 29 49 37 31 29 42 -139 0 0 30 45 13 11 7 25 14 85 -51 30 23 41 31 6 47 29 55 15 31 35 15 -138 0 0 30 50 24 11 7 26 14 86 -50 30 28 52 31 11 56 30 0 28 31 40 23 -137 0 0 30 55 9 11 7 26 15 86 -49 30 33 38 31 16 40 30 5 15 31 45 6 -136 0 0 30 59 29 11 7 27 16 87 -49 30 37 59 31 21 0 30 9 37 31 49 24 -135 0 0 31 3 25 11 7 28 17 87 -48 30 41 56 31 24 54 30 13 35 31 53 17 -134 0 0 31 6 55 11 7 29 18 88 -47 30 45 27 31 28 24 30 17 7 31 56 46 -133 0 0 31 10 0 11 7 30 19 88 -46 30 48 33 31 31 28 30 20 13 31 59 50 -132 0 0 31 12 41 11 7 32 20 89 -46 30 51 13 31 34 8 30 22 55 32 2 29 -131 0 0 31 14 56 11 7 33 20 89 -45 30 53 29 31 36 23 30 25 11 32 4 43 -130 0 0 31 16 46 11 7 34 21 90 -44 30 55 20 31 38 13 30 27 3 32 6 33 -129 0 0 31 18 12 11 7 35 22 90 -43 30 56 46 31 39 38 30 28 29 32 7 57 -128 0 0 31 19 12 11 7 37 23 91 -42 30 57 46 31 40 38 30 29 30 32 8 57 -127 0 0 31 19 47 11 7 38 24 91 -42 30 58 22 31 41 13 30 30 5 32 9 32 -126 0 0 31 19 58 11 7 39 25 92 -41 30 58 32 31 41 24 30 30 16 32 9 42 -125 0 0 31 19 43 11 7 41 26 92 -40 30 58 17 31 41 9 30 30 1 32 9 28 -124 0 0 31 19 3 11 7 42 26 93 -39 30 57 37 31 40 29 30 29 21 32 8 48 -123 0 0 31 17 58 11 7 44 27 93 -39 30 56 32 31 39 25 30 28 16 32 7 44 -122 0 0 31 16 28 11 7 45 28 94 -38 30 55 2 31 37 55 30 26 45 32 6 15 -121 0 0 31 14 33 11 7 47 29 95 -37 30 53 7 31 36 1 30 24 49 32 4 21 -120 0 0 31 12 13 11 7 49 30 95 -36 30 50 46 31 33 41 30 22 28 32 2 2 -119 0 0 31 9 28 11 7 50 31 96 -35 30 48 0 31 30 56 30 19 41 31 59 18 -118 0 0 31 6 18 11 7 52 32 96 -35 30 44 49 31 27 46 30 16 29 31 56 9 -117 0 0 31 2 42 11 7 54 32 97 -34 30 41 13 31 24 11 30 12 52 31 52 34 -116 0 0 30 58 41 11 7 56 33 97 -33 30 37 11 31 20 11 30 8 49 31 48 35 -115 0 0 30 54 14 11 7 58 34 98 -32 30 32 44 31 15 46 30 4 21 31 44 11 -114 0 0 30 49 23 11 8 0 35 98 -31 30 27 51 31 10 55 29 59 27 31 39 22 -113 0 0 30 44 6 11 8 2 36 99 -31 30 22 33 31 5 39 29 54 7 31 34 7 -112 0 0 30 38 23 11 8 4 37 99 -30 30 16 49 30 59 58 29 48 22 31 28 27 -111 0 0 30 32 15 11 8 6 38 100 -29 30 10 40 30 53 51 29 42 11 31 22 22 -110 0 0 30 25 42 11 8 8 39 100 -28 30 4 5 30 47 19 29 35 34 31 15 52 -109 0 0 30 18 43 11 8 10 39 101 -27 29 57 5 30 40 21 29 28 32 31 8 56 -108 0 0 30 11 18 11 8 12 40 102 -26 29 49 39 30 32 58 29 21 4 31 1 35 -107 0 0 30 3 27 11 8 15 41 102 -26 29 41 47 30 25 9 29 13 10 30 53 48 -106 0 0 29 55 11 11 8 17 42 103 -25 29 33 29 30 16 54 29 4 50 30 45 35 -105 0 0 29 46 29 11 8 19 43 103 -24 29 24 45 30 8 14 28 56 4 30 36 57 -104 0 0 29 37 22 11 8 22 44 104 -23 29 15 36 29 59 8 28 46 52 30 27 54 -103 0 0 29 27 48 11 8 24 45 104 -22 29 6 0 29 49 36 28 37 14 30 18 24 -102 0 0 29 17 48 11 8 27 46 105 -21 28 55 59 29 39 39 28 27 10 30 8 29 -101 0 0 29 7 23 11 8 29 47 105 -20 28 45 31 29 29 15 28 16 40 29 58 8 -100 0 0 28 56 31 11 8 32 47 106 -20 28 34 37 29 18 26 28 5 44 29 47 22 - 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2007 Mar 09 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 108° remarks: * orbital elements for (478) Tergeste : Mean anomaly = 348.47484831 deg Arg. of pericenter = 241.30489675 deg Long. of node = 234.02092293 deg Inclination = 13.17477377 deg Eccentricity = 0.08811460 Semimajor axis = 3.01537073 AU Perihelion dist = 2.74967253 AU Mag: H = 7.89, G = 0.15 Epoch of elements : MJD 54377.46500000 TDT (2007 Oct 04.465) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 04 478 Tergeste 11h 11.1m UT 11.8 8 4 47.305 11 3 26.522UCAC 35746574 0.0 13.5 79 2.8 2.933 2.935 -20.19 -59.336 11.063 9.45 -4.30 11.1845 .02982 .06186 14.41374 -6.73373 -0.00532 0.00081 2000 347.0696972007 927.00000241.304897234.020923 13.1747740.088114603.015370732.749672537.985 0.15 RATE 1.8823180 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.028 0.024 96.8 1.660 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 21, 19:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org