IOTA/IOTA-ES occultation update for (2957) Tatsuo / TYC 0814-01960-1 event on 2012 Oct 31, 11:15 UT Visible from N USA, W Canada Summary ------- On 2012 Oct 31 UT, the 19 km diameter asteroid (2957) Tatsuo will occult a 9.0 mag star in the constellation Cancer for observers along a path across N USA, W Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.7 mag to 16.7 mag (the magnitude of the asteroid) for at most 1.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2012 Oct 31, 11:10 - 2012 Oct 31, 11:14 UT * geocentric midpoint of event [JD]: 2456231.96905 * magnitude of target star: 9.0 * magnitude drop [mag]: 7.7 * estimated maximum duration [s]: 1.1 * Moon: 98 % sunlit, 77° distance * Sun: 85° distance * rough path description: N USA, W Canada Additional comments ------------------- 4" double star The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 5.48 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .043", 100° ) * approx speed of asteroid's shadow [km/s]: 17.5465 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0814-01960-1 by 2957 Tatsuo on 2012 Oct 31 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 -179 0 0 55 48 11 11 10 1 0 71 -48 55 42 8 55 54 14 .. .. .. 57 0 53 -178 0 0 55 59 28 11 10 1 1 72 -48 55 53 26 56 5 30 .. .. .. 57 11 56 -177 0 0 56 10 21 11 10 1 1 73 -48 56 4 20 56 16 21 .. .. .. 57 22 35 -176 0 0 56 20 50 11 10 1 2 74 -48 56 14 51 56 26 49 .. .. .. 57 32 50 -175 0 0 56 30 55 11 10 1 3 75 -48 56 24 57 56 36 54 .. .. .. 57 42 43 -174 0 0 56 40 37 11 10 1 3 76 -48 56 34 40 56 46 35 .. .. .. 57 52 12 -173 0 0 56 49 56 11 10 1 4 76 -48 56 44 0 56 55 53 .. .. .. 58 1 19 -172 0 0 56 58 53 11 10 2 4 77 -47 56 52 58 57 4 48 .. .. .. 58 10 4 -171 0 0 57 7 26 11 10 2 5 78 -47 57 1 32 57 13 21 .. .. .. 58 18 26 -170 0 0 57 15 38 11 10 2 5 79 -47 57 9 45 57 21 31 56 5 33 58 26 26 -169 0 0 57 23 27 11 10 3 6 80 -47 57 17 35 57 29 20 56 13 32 58 34 5 -168 0 0 57 30 54 11 10 3 7 81 -47 57 25 3 57 36 46 56 21 9 58 41 22 -167 0 0 57 38 0 11 10 4 7 81 -47 57 32 9 57 43 51 56 28 24 58 48 17 -166 0 0 57 44 43 11 10 4 8 82 -46 57 38 53 57 50 34 56 35 17 58 54 52 -165 0 0 57 51 6 11 10 5 8 83 -46 57 45 17 57 56 55 56 41 48 59 1 6 -164 0 0 57 57 7 11 10 5 9 84 -46 57 51 19 58 2 56 56 47 57 59 6 58 -163 0 0 58 2 47 11 10 6 9 85 -46 57 56 59 58 8 35 56 53 45 59 12 31 -162 0 0 58 8 7 11 10 7 10 86 -46 58 2 19 58 13 54 56 59 12 59 17 42 -161 0 0 58 13 5 11 10 7 10 87 -45 58 7 19 58 18 52 57 4 17 59 22 34 -160 0 0 58 17 43 11 10 8 11 87 -45 58 11 57 58 23 29 57 9 2 59 27 5 -159 0 0 58 22 0 11 10 9 11 88 -45 58 16 15 58 27 46 57 13 25 59 31 16 -158 0 0 58 25 58 11 10 9 12 89 -45 58 20 12 58 31 43 57 17 28 59 35 7 -157 0 0 58 29 34 11 10 10 12 90 -45 58 23 50 58 35 19 57 21 10 59 38 39 -156 0 0 58 32 51 11 10 11 13 91 -44 58 27 7 58 38 35 57 24 31 59 41 51 -155 0 0 58 35 47 11 10 12 14 92 -44 58 30 4 58 41 32 57 27 32 59 44 43 -154 0 0 58 38 24 11 10 13 14 93 -44 58 32 40 58 44 8 57 30 12 59 47 15 -153 0 0 58 40 41 11 10 14 15 93 -44 58 34 57 58 46 24 57 32 32 59 49 29 -152 0 0 58 42 37 11 10 15 15 94 -43 58 36 54 58 48 21 57 34 32 59 51 22 -151 0 0 58 44 14 11 10 16 16 95 -43 58 38 31 58 49 57 57 36 11 59 52 57 -150 0 0 58 45 31 11 10 17 16 96 -43 58 39 49 58 51 14 57 37 30 59 54 12 -149 0 0 58 46 29 11 10 18 17 97 -42 58 40 46 58 52 11 57 38 29 59 55 7 -148 0 0 58 47 6 11 10 19 17 98 -42 58 41 24 58 52 49 57 39 8 59 55 44 -147 0 0 58 47 24 11 10 20 18 99 -42 58 41 42 58 53 7 57 39 27 59 56 1 -146 0 0 58 47 22 11 10 21 18 100 -42 58 41 40 58 53 5 57 39 25 59 55 59 -145 0 0 58 47 1 11 10 22 19 101 -41 58 41 18 58 52 43 57 39 3 59 55 38 -144 0 0 58 46 19 11 10 23 19 101 -41 58 40 37 58 52 2 57 38 21 59 54 57 -143 0 0 58 45 18 11 10 25 20 102 -41 58 39 36 58 51 1 57 37 19 59 53 57 -142 0 0 58 43 57 11 10 26 20 103 -40 58 38 15 58 49 40 57 35 56 59 52 38 -141 0 0 58 42 17 11 10 27 21 104 -40 58 36 34 58 48 0 57 34 13 59 50 59 -140 0 0 58 40 16 11 10 29 21 105 -40 58 34 33 58 45 59 57 32 10 59 49 1 -139 0 0 58 37 55 11 10 30 22 106 -39 58 32 12 58 43 39 57 29 47 59 46 44 -138 0 0 58 35 14 11 10 31 22 107 -39 58 29 31 58 40 58 57 27 2 59 44 6 -137 0 0 58 32 13 11 10 33 23 108 -39 58 26 30 58 37 58 57 23 58 59 41 10 -136 0 0 58 28 52 11 10 34 23 109 -38 58 23 8 58 34 37 57 20 32 59 37 53 -135 0 0 58 25 11 11 10 36 24 109 -38 58 19 26 58 30 56 57 16 46 59 34 16 -134 0 0 58 21 9 11 10 37 24 110 -38 58 15 24 58 26 54 57 12 38 59 30 20 -133 0 0 58 16 46 11 10 39 25 111 -37 58 11 0 58 22 32 57 8 10 59 26 3 -132 0 0 58 12 3 11 10 40 25 112 -37 58 6 17 58 17 49 57 3 20 59 21 26 -131 0 0 58 6 58 11 10 42 26 113 -37 58 1 12 58 12 46 56 58 10 59 16 28 -130 0 0 58 1 33 11 10 44 26 114 -36 57 55 46 58 7 21 56 52 37 59 11 10 -129 0 0 57 55 47 11 10 45 27 115 -36 57 49 59 58 1 35 56 46 43 59 5 32 -128 0 0 57 49 39 11 10 47 28 116 -36 57 43 50 57 55 28 56 40 27 58 59 32 -127 0 0 57 43 9 11 10 49 28 117 -35 57 37 20 57 48 59 56 33 49 58 53 11 -126 0 0 57 36 18 11 10 51 29 118 -35 57 30 27 57 42 8 56 26 49 58 46 29 -125 0 0 57 29 4 11 10 53 29 119 -34 57 23 13 57 34 55 56 19 26 58 39 25 -124 0 0 57 21 29 11 10 55 30 120 -34 57 15 37 57 27 21 56 11 41 58 31 59 -123 0 0 57 13 31 11 10 57 30 121 -34 57 7 38 57 19 23 56 3 33 58 24 12 -122 0 0 57 5 10 11 10 59 31 121 -33 56 59 16 57 11 4 55 55 1 58 16 2 -121 0 0 56 56 26 11 11 1 31 122 -33 56 50 32 57 2 21 55 46 7 58 7 29 -120 0 0 56 47 19 11 11 3 32 123 -32 56 41 24 56 53 15 55 36 48 57 58 34 -119 0 0 56 37 49 11 11 5 32 124 -32 56 31 53 56 43 46 55 27 6 57 49 16 -118 0 0 56 27 55 11 11 7 33 125 -31 56 21 57 56 33 53 55 17 0 57 39 35 -117 0 0 56 17 37 11 11 10 33 126 -31 56 11 38 56 23 36 55 6 29 57 29 30 -116 0 0 56 6 54 11 11 12 34 127 -31 56 0 55 56 12 54 54 55 34 57 19 1 -115 0 0 55 55 47 11 11 14 35 128 -30 55 49 47 56 1 49 54 44 13 57 8 8 -114 0 0 55 44 16 11 11 17 35 129 -30 55 38 14 55 50 18 54 32 28 56 56 50 -113 0 0 55 32 18 11 11 19 36 130 -29 55 26 15 55 38 22 54 20 16 56 45 8 -112 0 0 55 19 56 11 11 22 36 131 -29 55 13 51 55 26 1 54 7 39 56 33 0 -111 0 0 55 7 7 11 11 24 37 132 -28 55 1 2 55 13 13 53 54 35 56 20 27 -110 0 0 54 53 52 11 11 27 37 133 -28 54 47 46 55 0 0 53 41 5 56 7 28 -109 0 0 54 40 11 11 11 30 38 134 -27 54 34 3 54 46 20 53 27 8 55 54 3 -108 0 0 54 26 3 11 11 33 39 135 -27 54 19 53 54 32 13 53 12 44 55 40 11 -107 0 0 54 11 27 11 11 35 39 136 -26 54 5 16 54 17 39 52 57 52 55 25 53 -106 0 0 53 56 24 11 11 38 40 137 -26 53 50 12 54 2 37 52 42 32 55 11 7 -105 0 0 53 40 53 11 11 41 40 138 -25 53 34 39 53 47 8 52 26 44 54 55 53 -104 0 0 53 24 54 11 11 44 41 139 -24 53 18 39 53 31 10 52 10 28 54 40 12 -103 0 0 53 8 26 11 11 47 42 140 -24 53 2 9 53 14 43 51 53 42 54 24 2 -102 0 0 52 51 29 11 11 51 42 141 -23 52 45 11 52 57 48 51 36 27 54 7 23 -101 0 0 52 34 2 11 11 54 43 143 -23 52 27 43 52 40 23 51 18 43 53 50 16 -100 0 0 52 16 6 11 11 57 43 144 -22 52 9 45 52 22 28 51 0 28 53 32 38 - 99 0 0 51 57 40 11 12 1 44 145 -22 51 51 17 52 4 3 50 41 43 53 14 31 - 98 0 0 51 38 43 11 12 4 45 146 -21 51 32 19 51 45 8 50 22 28 52 55 54 - 97 0 0 51 19 15 11 12 8 45 147 -20 51 12 49 51 25 42 50 2 41 52 36 46 - 96 0 0 50 59 17 11 12 11 46 148 -20 50 52 49 51 5 45 49 42 24 52 17 6 - 95 0 0 50 38 46 11 12 15 47 149 -19 50 32 17 50 45 16 49 21 34 51 56 56 - 94 0 0 50 17 44 11 12 19 47 151 -18 50 11 13 50 24 16 49 0 13 51 36 14 - 93 0 0 49 56 10 11 12 23 48 152 -18 49 49 38 50 2 43 48 38 19 51 15 0 - 92 0 0 49 34 4 11 12 27 48 153 -17 49 27 29 49 40 38 48 15 53 50 53 13 - 91 0 0 49 11 24 11 12 31 49 154 -16 49 4 48 49 18 1 47 52 55 50 30 54 - 90 0 0 48 48 12 11 12 35 50 156 -16 48 41 35 48 54 50 47 29 23 50 8 2 - 89 0 0 48 24 27 11 12 39 50 157 -15 48 17 48 48 31 7 47 5 18 49 44 37 - 88 0 0 48 0 8 11 12 43 51 158 -14 47 53 27 48 6 50 46 40 40 49 20 38 - 87 0 0 47 35 16 11 12 48 52 160 -14 47 28 33 47 41 59 46 15 29 48 56 6 - 86 0 0 47 9 50 11 12 52 52 161 -13 47 3 5 47 16 34 45 49 44 48 30 59 - 85 0 0 46 43 50 11 12 57 53 162 -12 46 37 4 46 50 36 45 23 25 48 5 19 - 84 0 0 46 17 16 11 13 2 53 164 -11 46 10 28 46 24 3 44 56 32 47 39 5 - 83 0 0 45 50 7 11 13 6 54 165 -11 45 43 18 45 56 57 44 29 5 47 12 16 - 82 0 0 45 22 25 11 13 11 55 167 -10 45 15 35 45 29 16 44 1 4 46 44 53 - 81 0 0 44 54 9 11 13 16 55 169 -9 44 47 17 45 1 1 43 32 30 46 16 55 - 80 0 0 44 25 18 11 13 21 56 170 -8 44 18 25 44 32 13 43 3 22 45 48 23 - 79 0 0 43 55 54 11 13 26 56 172 -7 43 48 59 44 2 50 42 33 40 45 19 16 - 78 0 0 43 25 56 11 13 32 57 174 -7 43 18 59 43 32 53 42 3 25 44 49 36 - 77 0 0 42 55 24 11 13 37 58 175 -6 42 48 26 43 2 22 41 32 37 44 19 21 - 76 0 0 42 24 18 11 13 43 58 177 -5 42 17 19 42 31 18 41 1 15 43 48 32 - 75 0 0 41 52 40 11 13 48 59 179 -4 41 45 39 41 59 41 40 29 21 43 17 10 - 74 0 0 41 20 28 11 13 54 59 181 -3 41 13 27 41 27 31 39 56 55 42 45 14 - 73 0 0 40 47 45 11 14 0 60 183 -2 40 40 42 40 54 48 39 23 57 42 12 45 - 72 0 0 40 14 29 11 14 5 60 185 -1 40 7 25 40 21 34 38 50 27 41 39 44 - 71 0 0 39 40 42 11 14 11 61 187 0 39 33 36 39 47 48 38 16 27 41 6 10 Uncertainty in time = +/- 7 secs Prediction of 2012 Sep 3.0 Data for the target star ------------------------ * name: TYC 0814-01960-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 55 27.0409 DE: +10 39 21.626 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .036, .037 ) * V mag [mag]: 9.0 * B mag [mag]: 10.4 * Apparent position with proper motion RA(deg): 134.0398446880 DE(deg): 10.6051787753 * Equation of equinoxes (radians) : 0.000057777151892 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2957) Tatsuo approx. diameter [km]: 19 approx. diameter ["]: .008 distance from Earth [AU]: 3.21700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1074 number of rejected observations: 34 time covered by the observations: 1934 Feb 10 - 2012 Mar 21 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.023, 110° remarks: * orbital elements for (2957) Tatsuo : Mean anomaly = 160.28043925 deg Arg. of pericenter = 63.04164555 deg Long. of node = 249.43591746 deg Inclination = 8.71385581 deg Eccentricity = 0.09171365 Semimajor axis = 3.01983280 AU Perihelion dist = 2.74287291 AU Mag: H = 10.81, G = 0.15 Epoch of elements : MJD 56231.46900000 TDT (2012 Oct 31.469) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 31 2957 Tatsuo 11h 15.4m UT 9.0 8 55 27.041 10 39 21.63TYC 0814-01960-1 10.4 16.7 19 1.1 3.217 1.576 -13.89 -75.1577 10.660 7.05 -14.32 11.2572 0.22517 0.37754 8.50033 -5.08213 -0.00568 0.00158 2000 160.00453920121030.00000 63.041646249.435917 8.7138560.09171365 3.0198328 2.742872910.7 5.00.15 RATE 1.8781480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.043 100 6.48 0.044 0 0-1-4 056173.0020121031_1960-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 03, 21:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org