IOTA/IOTA-ES occultation update for (478) Tergeste / UCAC2 37694672 event on 2012 Sep 30, 06:00 UT Visible from SE Canada, N USA Summary ------- On 2012 Sep 30 UT, the 86 km diameter asteroid (478) Tergeste will occult a 10.4 mag star in the constellation Gemini for observers along a path across SE Canada, N USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 13.4 mag (the magnitude of the asteroid) for at most 4.2 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: 69 * date and approx. time of event: 2012 Sep 30, 05:55 - 2012 Sep 30, 05:59 UT * geocentric midpoint of event [JD]: 2456200.75009167 * magnitude of target star: 10.4 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 4.2 * Moon: 100 % sunlit, 93° distance * Sun: 85° distance * rough path description: SE Canada, N USA Additional comments ------------------- possible double star The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.86 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .034", 91° ) * approx speed of asteroid's shadow [km/s]: 20.4375 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 37694672 by 478 Tergeste on 2012 Sep 30 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 -100 0 0 41 8 5 5 55 15 0 68 -51 .. .. .. 41 34 53 .. .. .. 42 21 13 - 99 0 0 41 26 17 5 55 15 1 69 -51 40 59 37 41 53 2 40 13 56 42 39 14 - 98 0 0 41 44 5 5 55 15 2 69 -51 41 17 29 42 10 45 40 31 55 42 56 50 - 97 0 0 42 1 27 5 55 15 2 70 -51 41 34 56 42 28 4 40 49 29 43 14 1 - 96 0 0 42 18 26 5 55 16 3 71 -51 41 51 58 42 44 58 41 6 38 43 30 48 - 95 0 0 42 34 59 5 55 16 4 71 -50 42 8 36 43 1 27 41 23 23 43 47 11 - 94 0 0 42 51 8 5 55 16 5 72 -50 42 24 49 43 17 32 41 39 43 44 3 8 - 93 0 0 43 6 53 5 55 17 6 73 -50 42 40 37 43 33 13 41 55 38 44 18 42 - 92 0 0 43 22 13 5 55 17 6 73 -50 42 56 1 43 48 29 42 11 9 44 33 51 - 91 0 0 43 37 9 5 55 18 7 74 -49 43 11 1 44 3 21 42 26 15 44 48 36 - 90 0 0 43 51 40 5 55 18 8 75 -49 43 25 36 44 17 48 42 40 57 45 2 57 - 89 0 0 44 5 47 5 55 19 9 75 -49 43 39 47 44 31 52 42 55 14 45 16 53 - 88 0 0 44 19 30 5 55 20 9 76 -49 43 53 34 44 45 31 43 9 7 45 30 26 - 87 0 0 44 32 49 5 55 20 10 77 -48 44 6 57 44 58 46 43 22 36 45 43 35 - 86 0 0 44 45 44 5 55 21 11 78 -48 44 19 55 45 11 38 43 35 41 45 56 20 - 85 0 0 44 58 16 5 55 22 12 78 -48 44 32 30 45 24 5 43 48 22 46 8 42 - 84 0 0 45 10 23 5 55 23 12 79 -47 44 44 41 45 36 9 44 0 39 46 20 39 - 83 0 0 45 22 7 5 55 24 13 80 -47 44 56 29 45 47 50 44 12 32 46 32 14 - 82 0 0 45 33 28 5 55 25 14 80 -47 45 7 53 45 59 7 44 24 2 46 43 25 - 81 0 0 45 44 25 5 55 26 15 81 -46 45 18 53 46 10 1 44 35 7 46 54 13 - 80 0 0 45 54 59 5 55 27 15 82 -46 45 29 30 46 20 32 44 45 50 47 4 39 - 79 0 0 46 5 9 5 55 28 16 83 -46 45 39 44 46 30 39 44 56 9 47 14 41 - 78 0 0 46 14 57 5 55 29 17 83 -45 45 49 34 46 40 24 45 6 4 47 24 20 - 77 0 0 46 24 21 5 55 31 17 84 -45 45 59 2 46 49 45 45 15 37 47 33 37 - 76 0 0 46 33 23 5 55 32 18 85 -44 46 8 6 46 58 44 45 24 46 47 42 31 - 75 0 0 46 42 2 5 55 33 19 86 -44 46 16 48 47 7 21 45 33 33 47 51 2 - 74 0 0 46 50 19 5 55 34 20 86 -44 46 25 7 47 15 34 45 41 56 47 59 11 - 73 0 0 46 58 13 5 55 36 20 87 -43 46 33 3 47 23 26 45 49 57 48 6 58 - 72 0 0 47 5 44 5 55 37 21 88 -43 46 40 37 47 30 55 45 57 35 48 14 23 - 71 0 0 47 12 53 5 55 39 22 89 -42 46 47 49 47 38 1 46 4 50 48 21 26 - 70 0 0 47 19 40 5 55 40 22 89 -42 46 54 38 47 44 46 46 11 43 48 28 6 - 69 0 0 47 26 4 5 55 42 23 90 -42 47 1 4 47 51 9 46 18 13 48 34 25 - 68 0 0 47 32 7 5 55 43 24 91 -41 47 7 9 47 57 9 46 24 21 48 40 22 - 67 0 0 47 37 47 5 55 45 24 92 -41 47 12 51 48 2 48 46 30 6 48 45 58 - 66 0 0 47 43 6 5 55 47 25 93 -40 47 18 11 48 8 4 46 35 30 48 51 11 - 65 0 0 47 48 3 5 55 48 26 93 -40 47 23 10 48 12 59 46 40 31 48 56 3 - 64 0 0 47 52 38 5 55 50 26 94 -39 47 27 46 48 17 33 46 45 10 49 0 34 - 63 0 0 47 56 51 5 55 52 27 95 -39 47 32 1 48 21 44 46 49 27 49 4 43 - 62 0 0 48 0 42 5 55 54 28 96 -38 47 35 54 48 25 35 46 53 22 49 8 31 - 61 0 0 48 4 12 5 55 55 28 97 -38 47 39 25 48 29 3 46 56 55 49 11 57 - 60 0 0 48 7 20 5 55 57 29 97 -37 47 42 34 48 32 10 47 0 7 49 15 3 - 59 0 0 48 10 7 5 55 59 30 98 -37 47 45 22 48 34 56 47 2 56 49 17 47 - 58 0 0 48 12 32 5 56 1 30 99 -36 47 47 48 48 37 20 47 5 23 49 20 9 - 57 0 0 48 14 36 5 56 3 31 100 -36 47 49 52 48 39 23 47 7 29 49 22 11 - 56 0 0 48 16 18 5 56 5 32 101 -35 47 51 35 48 41 5 47 9 13 49 23 52 - 55 0 0 48 17 39 5 56 7 32 102 -35 47 52 57 48 42 25 47 10 35 49 25 11 - 54 0 0 48 18 38 5 56 9 33 103 -34 47 53 56 48 43 24 47 11 36 49 26 9 - 53 0 0 48 19 16 5 56 12 34 103 -34 47 54 35 48 44 2 47 12 15 49 26 47 - 52 0 0 48 19 33 5 56 14 34 104 -33 47 54 51 48 44 19 47 12 32 49 27 3 - 51 0 0 48 19 28 5 56 16 35 105 -33 47 54 47 48 44 14 47 12 27 49 26 58 - 50 0 0 48 19 2 5 56 18 36 106 -32 47 54 20 48 43 47 47 12 0 49 26 32 - 49 0 0 48 18 14 5 56 21 36 107 -32 47 53 32 48 43 0 47 11 12 49 25 45 - 48 0 0 48 17 5 5 56 23 37 108 -31 47 52 23 48 41 51 47 10 2 49 24 36 - 47 0 0 48 15 34 5 56 25 37 109 -31 47 50 51 48 40 21 47 8 30 49 23 7 - 46 0 0 48 13 42 5 56 28 38 110 -30 47 48 59 48 38 29 47 6 36 49 21 16 - 45 0 0 48 11 28 5 56 30 39 110 -30 47 46 44 48 36 16 47 4 20 49 19 4 - 44 0 0 48 8 53 5 56 33 39 111 -29 47 44 8 48 33 41 47 1 43 49 16 31 - 43 0 0 48 5 55 5 56 35 40 112 -29 47 41 10 48 30 45 46 58 43 49 13 36 - 42 0 0 48 2 37 5 56 38 41 113 -28 47 37 50 48 27 27 46 55 21 49 10 20 - 41 0 0 47 58 56 5 56 40 41 114 -28 47 34 8 48 23 48 46 51 37 49 6 43 - 40 0 0 47 54 53 5 56 43 42 115 -27 47 30 4 48 19 46 46 47 31 49 2 44 - 39 0 0 47 50 29 5 56 45 43 116 -26 47 25 38 48 15 23 46 43 3 48 58 23 - 38 0 0 47 45 42 5 56 48 43 117 -26 47 20 50 48 10 38 46 38 12 48 53 41 - 37 0 0 47 40 34 5 56 51 44 118 -25 47 15 40 48 5 31 46 32 59 48 48 37 - 36 0 0 47 35 3 5 56 54 45 119 -25 47 10 7 48 0 2 46 27 23 48 43 11 - 35 0 0 47 29 9 5 56 57 45 120 -24 47 4 12 47 54 11 46 21 25 48 37 23 - 34 0 0 47 22 54 5 56 59 46 121 -24 46 57 54 47 47 57 46 15 4 48 31 13 - 33 0 0 47 16 16 5 57 2 46 122 -23 46 51 14 47 41 21 46 8 21 48 24 40 - 32 0 0 47 9 15 5 57 5 47 123 -22 46 44 11 47 34 23 46 1 14 48 17 46 - 31 0 0 47 1 52 5 57 8 48 124 -22 46 36 46 47 27 2 45 53 44 48 10 29 - 30 0 0 46 54 5 5 57 11 48 125 -21 46 28 57 47 19 18 45 45 51 48 2 49 - 29 0 0 46 45 56 5 57 14 49 126 -21 46 20 45 47 11 11 45 37 35 47 54 47 - 28 0 0 46 37 24 5 57 18 50 127 -20 46 12 10 47 2 41 45 28 55 47 46 22 - 27 0 0 46 28 28 5 57 21 50 128 -19 46 3 12 46 53 48 45 19 52 47 37 34 - 26 0 0 46 19 9 5 57 24 51 130 -19 45 53 50 46 44 32 45 10 26 47 28 23 - 25 0 0 46 9 26 5 57 27 52 131 -18 45 44 4 46 34 53 45 0 35 47 18 48 - 24 0 0 45 59 20 5 57 31 52 132 -17 45 33 55 46 24 50 44 50 21 47 8 50 - 23 0 0 45 48 50 5 57 34 53 133 -17 45 23 22 46 14 23 44 39 42 46 58 29 - 22 0 0 45 37 56 5 57 37 54 134 -16 45 12 25 46 3 32 44 28 40 46 47 44 - 21 0 0 45 26 38 5 57 41 54 135 -15 45 1 3 45 52 18 44 17 13 46 36 35 - 20 0 0 45 14 56 5 57 44 55 137 -15 44 49 18 45 40 39 44 5 21 46 25 3 - 19 0 0 45 2 50 5 57 48 55 138 -14 44 37 8 45 28 36 43 53 5 46 13 6 - 18 0 0 44 50 19 5 57 51 56 139 -13 44 24 33 45 16 9 43 40 24 46 0 45 - 17 0 0 44 37 23 5 57 55 57 141 -13 44 11 34 45 3 17 43 27 19 45 47 59 - 16 0 0 44 24 3 5 57 59 57 142 -12 43 58 10 44 50 0 43 13 48 45 34 49 - 15 0 0 44 10 17 5 58 2 58 143 -11 43 44 20 44 36 18 42 59 52 45 21 14 - 14 0 0 43 56 7 5 58 6 59 145 -11 43 30 6 44 22 12 42 45 31 45 7 15 - 13 0 0 43 41 31 5 58 10 59 146 -10 43 15 26 44 7 40 42 30 45 44 52 50 - 12 0 0 43 26 30 5 58 14 60 148 -9 43 0 21 43 52 43 42 15 33 44 38 0 - 11 0 0 43 11 3 5 58 18 60 149 -9 42 44 51 43 37 21 41 59 55 44 22 45 - 10 0 0 42 55 11 5 58 22 61 151 -8 42 28 54 43 21 33 41 43 52 44 7 4 - 9 0 0 42 38 54 5 58 26 62 153 -7 42 12 32 43 5 20 41 27 23 43 50 58 - 8 0 0 42 22 10 5 58 30 62 154 -6 41 55 45 42 48 40 41 10 28 43 34 27 - 7 0 0 42 5 1 5 58 34 63 156 -6 41 38 31 42 31 35 40 53 7 43 17 29 - 6 0 0 41 47 25 5 58 38 63 158 -5 41 20 51 42 14 4 40 35 20 43 0 6 - 5 0 0 41 29 24 5 58 43 64 160 -4 41 2 45 41 56 7 40 17 6 42 42 16 - 4 0 0 41 10 56 5 58 47 64 162 -3 40 44 13 41 37 44 39 58 27 42 24 1 - 3 0 0 40 52 2 5 58 51 65 164 -3 40 25 15 41 18 54 39 39 21 42 5 19 - 2 0 0 40 32 42 5 58 56 65 166 -2 40 5 50 40 59 39 39 19 49 41 46 11 - 1 0 0 40 12 56 5 59 0 66 168 -1 39 45 59 40 39 57 38 59 50 41 26 37 0 0 0 39 52 43 5 59 5 66 171 0 39 25 42 40 19 49 38 39 26 41 6 37 Uncertainty in time = +/- 6 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: UCAC2 37694672 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 51 29.5930 DE: +16 30 27.083 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .057, .032 ) * V mag [mag]: 10.4 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (478) Tergeste approx. diameter [km]: 86 approx. diameter ["]: .044 distance from Earth [AU]: 2.69800 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1044 number of rejected observations: 85 time covered by the observations: 1901 Sep 22 - 2012 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 105° remarks: * orbital elements for (478) Tergeste : Mean anomaly = 333.67383439 deg Arg. of pericenter = 239.17114748 deg Long. of node = 233.93934074 deg Inclination = 13.18692783 deg Eccentricity = 0.08531310 Semimajor axis = 3.01913050 AU Perihelion dist = 2.76155912 AU Mag: H = 7.93, G = 0.15 Epoch of elements : MJD 56200.25000000 TDT (2012 Sep 30.250) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 30 478 Tergeste 6h 0.1m UT 10.4 6 51 29.593 16 30 27.08UCAC2 37694672 0.0 13.4 86 4.2 2.698 2.405 -14.75 3.4487 16.512 87.45 -2.97 6.0022 0.13405 0.31446 10.61159 -4.52352 -0.00566 0.00045 2000 333.6268642012 930.00000239.171147233.939341 13.1869280.08531310 3.0191305 2.7615591 8.0 5.00.15 RATE 1.8788030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.034 91 1.86 0.038 0 0 0 3 056146.0020120930_694672 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 21:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org