IOTA/IOTA-ES occultation update for (1191) Alfaterna / UCAC2 26590172 event on 2012 Sep 05, 11:35 UT Visible from W Canada, Alaska, Hawaii, E Australia Summary ------- On 2012 Sep 05 UT, the 46 km diameter asteroid (1191) Alfaterna will occult a 11.8 mag star in the constellation Cetus for observers along a path across W Canada, Alaska, Hawaii, E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 15.5 mag (the magnitude of the asteroid) for at most 3.6 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: 44 * date and approx. time of event: 2012 Sep 05, 11:28 - 2012 Sep 05, 11:42 UT * geocentric midpoint of event [JD]: 2456175.98286667 * magnitude of target star: 11.8 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 3.6 * Moon: 78 % sunlit, 36° distance * Sun: 149° distance * rough path description: W Canada, Alaska, Hawaii, E Australia The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 1.49 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .041", 81° ) * approx speed of asteroid's shadow [km/s]: 12.7689 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26590172 by 1191 Alfaterna on 2012 Sep 5 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 ' " Longitude Longitude Longitude Longitude -122 33 43 75 0 0 11 28 1 0 198 -3 -123 31 4 ... .. .. -126 21 12 ... .. .. -123 46 53 74 0 0 11 28 1 1 197 -4 -124 40 35 -122 53 3 -127 20 2 ... .. .. -124 53 32 73 0 0 11 28 2 2 196 -5 -125 44 4 -124 2 55 -128 14 10 -121 31 24 -125 54 49 72 0 0 11 28 2 3 195 -6 -126 42 32 -125 7 1 -129 4 25 -122 44 4 -126 51 36 71 0 0 11 28 3 4 194 -7 -127 36 51 -126 6 18 -129 51 25 -123 50 54 -127 44 37 70 0 0 11 28 4 5 193 -8 -128 27 39 -127 1 33 -130 35 42 -124 52 53 -128 34 26 69 0 0 11 28 5 6 193 -9 -129 15 28 -127 53 21 -131 17 40 -125 50 43 -129 21 30 68 0 0 11 28 6 7 192 -10 -130 0 45 -128 42 14 -131 57 39 -126 45 1 -130 6 13 67 0 0 11 28 7 8 191 -11 -130 43 51 -129 28 35 -132 35 56 -127 36 16 -130 48 54 66 0 0 11 28 9 9 191 -11 -131 25 3 -130 12 45 -133 12 46 -128 24 54 -131 29 49 65 0 0 11 28 11 10 190 -12 -132 4 37 -130 55 1 -133 48 19 -129 11 15 -132 9 11 64 0 0 11 28 12 12 189 -13 -132 42 44 -131 35 37 -134 22 46 -129 55 35 -132 47 12 63 0 0 11 28 15 13 189 -14 -133 19 37 -132 14 47 -134 56 16 -130 38 11 -133 24 1 62 0 0 11 28 17 14 188 -15 -133 55 23 -132 52 40 -135 28 55 -131 19 13 -133 59 48 61 0 0 11 28 19 15 188 -16 -134 30 12 -133 29 25 -136 0 51 -131 58 54 -134 34 40 60 0 0 11 28 22 16 187 -17 -135 4 9 -134 5 11 -136 32 8 -132 37 22 -135 8 43 59 0 0 11 28 25 17 187 -18 -135 37 22 -134 40 4 -137 2 51 -133 14 46 -135 42 3 58 0 0 11 28 28 18 186 -19 -136 9 55 -135 14 11 -137 33 5 -133 51 13 -136 14 45 57 0 0 11 28 31 19 186 -20 -136 41 54 -135 47 37 -138 2 54 -134 26 50 -136 46 53 56 0 0 11 28 34 20 185 -21 -137 13 22 -136 20 26 -138 32 21 -135 1 41 -137 18 32 55 0 0 11 28 38 21 185 -22 -137 44 23 -136 52 43 -139 1 29 -135 35 52 -137 49 46 54 0 0 11 28 42 22 184 -23 -138 15 0 -137 24 32 -139 30 20 -136 9 28 -138 20 36 53 0 0 11 28 46 23 184 -24 -138 45 17 -137 55 56 -139 58 58 -136 42 32 -138 51 7 52 0 0 11 28 50 24 183 -25 -139 15 17 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-151 33 41 -150 58 31 -152 26 18 -150 6 19 -151 47 40 26 0 0 11 31 32 49 166 -51 -152 5 10 -151 30 11 -152 57 30 -150 38 18 -152 19 32 25 0 0 11 31 40 50 165 -53 -152 36 57 -152 2 9 -153 29 1 -151 10 32 -152 51 44 24 0 0 11 31 48 51 164 -54 -153 9 4 -152 34 26 -154 0 54 -151 43 3 -153 24 15 23 0 0 11 31 56 51 163 -55 -153 41 31 -153 7 2 -154 33 8 -152 15 52 -153 57 8 22 0 0 11 32 5 52 162 -56 -154 14 20 -153 39 58 -155 5 46 -152 49 0 -154 30 23 21 0 0 11 32 14 53 161 -57 -154 47 31 -154 13 16 -155 38 47 -153 22 29 -155 4 1 20 0 0 11 32 23 54 159 -58 -155 21 6 -154 46 57 -156 12 15 -153 56 18 -155 38 3 19 0 0 11 32 31 54 158 -59 -155 55 7 -155 21 2 -156 46 8 -154 30 30 -156 12 32 18 0 0 11 32 40 55 157 -60 -156 29 33 -155 55 32 -157 20 30 -155 5 7 -156 47 27 17 0 0 11 32 50 56 155 -61 -157 4 27 -156 30 29 -157 55 20 -155 40 8 -157 22 51 16 0 0 11 32 59 57 154 -62 -157 39 51 -157 5 54 -158 30 41 -156 15 36 -157 58 45 15 0 0 11 33 8 57 152 -63 -158 15 44 -157 41 48 -159 6 34 -156 51 31 -158 35 10 14 0 0 11 33 18 58 150 -65 -158 52 10 -158 18 14 -159 43 1 -157 27 56 -159 12 9 13 0 0 11 33 27 58 149 -66 -159 29 8 -158 55 11 -160 20 2 -158 4 52 -159 49 41 12 0 0 11 33 37 59 147 -67 -160 6 42 -159 32 43 -160 57 40 -158 42 21 -160 27 50 11 0 0 11 33 47 59 145 -68 -160 44 53 -160 10 50 -161 35 56 -159 20 23 -161 6 37 10 0 0 11 33 57 60 143 -69 -161 23 42 -160 49 34 -162 14 53 -159 59 2 -161 46 4 9 0 0 11 34 7 60 141 -70 -162 3 12 -161 28 58 -162 54 31 -160 38 18 -162 26 12 8 0 0 11 34 17 61 139 -72 -162 43 24 -162 9 3 -163 34 54 -161 18 13 -163 7 5 7 0 0 11 34 27 61 137 -73 -163 24 20 -162 49 52 -164 16 4 -161 58 51 -163 48 44 6 0 0 11 34 37 61 135 -74 -164 6 4 -163 31 26 -164 58 2 -162 40 12 -164 31 11 5 0 0 11 34 48 61 133 -75 -164 48 37 -164 13 49 -165 40 52 -163 22 19 -165 14 30 4 0 0 11 34 58 62 130 -76 -165 32 2 -164 57 2 -166 24 35 -164 5 15 -165 58 43 3 0 0 11 35 9 62 128 -77 -166 16 21 -165 41 8 -167 9 16 -164 49 2 -166 43 53 2 0 0 11 35 19 62 126 -79 -167 1 39 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36 52 -27 6 33 -25 52 23 -27 50 30 153 0 0 -27 9 16 11 41 16 31 91 -54 -26 54 29 -27 24 0 -26 10 13 -28 7 45 152 0 0 -27 25 49 11 41 20 30 91 -53 -27 11 6 -27 40 29 -26 27 3 -28 24 1 151 0 0 -27 41 23 11 41 25 29 92 -52 -27 26 45 -27 56 0 -26 42 54 -28 39 20 150 0 0 -27 56 0 11 41 29 28 92 -51 -27 41 26 -28 10 33 -26 57 46 -28 53 42 149 0 0 -28 9 41 11 41 33 28 92 -50 -27 55 10 -28 24 10 -27 11 41 -29 7 9 148 0 0 -28 22 25 11 41 37 27 92 -49 -28 7 57 -28 36 52 -27 24 38 -29 19 41 147 0 0 -28 34 15 11 41 41 26 93 -49 -28 19 49 -28 48 38 -27 36 40 -29 31 18 146 0 0 -28 45 9 11 41 45 25 93 -48 -28 30 47 -28 59 29 -27 47 45 -29 42 2 145 0 0 -28 55 9 11 41 48 24 94 -47 -28 40 49 -29 9 27 -27 57 55 -29 51 52 144 0 0 -29 4 15 11 41 52 23 94 -46 -28 49 58 -29 18 31 -28 7 10 -30 0 49 143 0 0 -29 12 28 11 41 55 22 94 -45 -28 58 12 -29 26 42 -28 15 31 -30 8 54 142 0 0 -29 19 48 11 41 59 22 95 -44 -29 5 34 -29 34 0 -28 22 58 -30 16 7 141 0 0 -29 26 15 11 42 2 21 95 -43 -29 12 3 -29 40 25 -28 29 32 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42 127 0 0 -29 25 42 11 42 32 9 101 -32 -29 11 27 -29 39 55 -28 28 46 -30 22 7 126 0 0 -29 19 7 11 42 33 8 102 -31 -29 4 49 -29 33 22 -28 22 3 -30 15 39 125 0 0 -29 11 37 11 42 35 7 102 -30 -28 57 18 -29 25 55 -28 14 24 -30 8 19 124 0 0 -29 3 14 11 42 36 6 103 -29 -28 48 51 -29 17 34 -28 5 50 -30 0 5 123 0 0 -28 53 55 11 42 36 5 103 -28 -28 39 30 -29 8 17 -27 56 20 -29 50 57 122 0 0 -28 43 40 11 42 37 4 104 -28 -28 29 12 -28 58 6 -27 45 53 -29 40 54 121 0 0 -28 32 29 11 42 38 3 104 -27 -28 17 57 -28 46 58 -27 34 28 .. .. .. 120 0 0 -28 20 20 11 42 38 3 105 -26 -28 5 45 -28 34 53 -27 22 5 .. .. .. 119 0 0 -28 7 14 11 42 39 2 105 -25 -27 52 35 -28 21 50 -27 8 43 .. .. .. 118 0 0 -27 53 8 11 42 39 1 106 -24 -27 38 25 -28 7 49 -26 54 20 .. .. .. Uncertainty in time = +/- 6 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: UCAC2 26590172 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 01 01.3973 DE: -14 20 46.926 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .035 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1191) Alfaterna approx. diameter [km]: 46 approx. diameter ["]: .030 distance from Earth [AU]: 2.12600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 720 number of rejected observations: 22 time covered by the observations: 1931 Feb 18 - 2012 Aug 10 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.021, 76° remarks: * orbital elements for (1191) Alfaterna : Mean anomaly = 171.86828439 deg Arg. of pericenter = 54.00310604 deg Long. of node = 134.79138201 deg Inclination = 18.47716038 deg Eccentricity = 0.04979050 Semimajor axis = 2.89056822 AU Perihelion dist = 2.74664537 AU Mag: H = 10.73, G = 0.15 Epoch of elements : MJD 56175.48300000 TDT (2012 Sep 05.483) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 5 1191 Alfaterna 11h 35.3m UT 11.8 1 1 1.397-14 20 46.93UCAC2 26590172 0.0 15.5 46 3.6 2.126 -1.125 -24.94 -143.5561 -14.339 5.81 6.56 11.5888 -0.39649 0.25908 -3.94983 -6.02842 -0.00292 0.00055 2000 170.7686522012 831.00000 54.003106134.791382 18.4771600.04979050 2.8905682 2.746645410.8 5.00.15 RATE 2.0055300 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.041 81 2.49 0.044 0 0 3 4 056165.0020120905_590172 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org