IOTA/IOTA-ES occultation update for (2957) Tatsuo / TYC 0231-01315-1 event on 2008 Mar 24, 06:29 UT Visible from Colombia, Mexico, W USA, W Canada, Alaska Summary ------- On 2008 Mar 24 UT, the 26 km diameter asteroid (2957) Tatsuo will occult a 10.1 mag star in the constellation Hydra for observers along a path across Colombia, Mexico, W USA, W Canada, Alaska. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.5 mag (the magnitude of the asteroid) for at most 3.3 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: 21 * date and approx. time of event: 2008 Mar 24, 06:18 - 2008 Mar 24, 06:38 UT * midpoint of event [JD]: 2454549.76997083 * magnitude of target star: 10.1 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 3.3 * Moon: 94 % sunlit, 70° distance * Sun: 137° distance * rough path description: Colombia, Mexico, W USA, W Canada, Alaska The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 3.23 * 1 sigma uncertainty interval [seconds]: +/- 13.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .045", 107° ) * approx speed of asteroid's shadow [km/s]: 7.7441 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0231-01315-1 by 2957 Tatsuo on 2008 Mar 24 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 - 51 36 36 1 0 0 6 18 32 5 273 -48 - 50 25 50 - 52 39 29 ... .. .. - 57 50 3 - 57 3 22 2 0 0 6 18 47 11 273 -54 - 56 19 52 - 57 44 54 - 50 13 33 - 61 39 6 Latitude Latitude Latitude Latitude - 59 0 0 2 27 58 6 18 54 13 273 -56 2 37 35 2 18 22 3 40 19 1 16 56 - 60 0 0 2 43 41 6 18 59 14 273 -57 2 53 20 2 34 4 3 56 17 1 32 26 - 61 0 0 3 0 20 6 19 4 15 273 -57 3 10 1 2 50 40 4 13 12 1 48 50 - 62 0 0 3 17 53 6 19 9 16 273 -58 3 27 37 3 8 12 4 31 2 2 6 8 - 63 0 0 3 36 22 6 19 14 17 272 -59 3 46 8 3 26 38 4 49 48 2 24 19 - 64 0 0 3 55 46 6 19 20 18 272 -60 4 5 34 3 45 59 5 9 30 2 43 26 - 65 0 0 4 16 5 6 19 26 19 272 -61 4 25 55 4 6 16 5 30 9 3 3 26 - 66 0 0 4 37 19 6 19 33 20 272 -62 4 47 13 4 27 27 5 51 44 3 24 21 - 67 0 0 4 59 29 6 19 40 21 272 -63 5 9 25 4 49 35 6 14 16 3 46 10 - 68 0 0 5 22 35 6 19 47 22 271 -64 5 32 34 5 12 37 6 37 45 4 8 54 - 69 0 0 5 46 36 6 19 55 23 271 -65 5 56 38 5 36 35 7 2 10 4 32 33 - 70 0 0 6 11 33 6 20 2 24 271 -65 6 21 39 6 1 29 7 27 32 4 57 6 - 71 0 0 6 37 26 6 20 11 25 271 -66 6 47 35 6 27 19 7 53 52 5 22 35 - 72 0 0 7 4 16 6 20 19 26 270 -67 7 14 28 6 54 5 8 21 8 5 48 58 - 73 0 0 7 32 1 6 20 28 27 270 -68 7 42 18 7 21 47 8 49 23 6 16 17 - 74 0 0 8 0 43 6 20 37 27 270 -68 8 11 3 7 50 25 9 18 34 6 44 31 - 75 0 0 8 30 22 6 20 47 28 269 -69 8 40 46 8 19 59 9 48 44 7 13 40 - 76 0 0 9 0 57 6 20 57 29 269 -69 9 11 25 8 50 30 10 19 51 7 43 45 - 77 0 0 9 32 28 6 21 7 30 268 -70 9 43 1 9 21 57 10 51 56 8 14 46 - 78 0 0 10 4 56 6 21 18 31 268 -70 10 15 34 9 54 21 11 24 59 8 46 41 - 79 0 0 10 38 21 6 21 29 32 267 -71 10 49 3 10 27 41 11 59 0 9 19 33 - 80 0 0 11 12 43 6 21 40 33 267 -71 11 23 30 11 1 58 12 33 59 9 53 20 - 81 0 0 11 48 2 6 21 52 34 266 -71 11 58 54 11 37 12 13 9 56 10 28 2 - 82 0 0 12 24 17 6 22 4 35 265 -72 12 35 14 12 13 22 13 46 52 11 3 40 - 83 0 0 13 1 29 6 22 16 36 265 -72 13 12 31 12 50 29 14 24 45 11 40 14 - 84 0 0 13 39 38 6 22 29 37 264 -72 13 50 46 13 28 32 15 3 37 12 17 43 - 85 0 0 14 18 43 6 22 42 37 263 -72 14 29 57 14 7 32 15 43 27 12 56 7 - 86 0 0 14 58 45 6 22 55 38 262 -72 15 10 4 14 47 27 16 24 14 13 35 27 - 87 0 0 15 39 43 6 23 8 39 262 -71 15 51 9 15 28 19 17 6 0 14 15 41 - 88 0 0 16 21 37 6 23 22 40 261 -71 16 33 9 16 10 7 17 48 43 14 56 50 - 89 0 0 17 4 26 6 23 37 41 260 -71 17 16 5 16 52 50 18 32 23 15 38 53 - 90 0 0 17 48 12 6 23 51 41 259 -70 17 59 57 17 36 29 19 17 1 16 21 50 - 91 0 0 18 32 52 6 24 6 42 257 -70 18 44 45 18 21 2 20 2 35 17 5 41 - 92 0 0 19 18 27 6 24 21 43 256 -69 19 30 27 19 6 30 20 49 6 17 50 26 - 93 0 0 20 4 57 6 24 36 43 255 -68 20 17 3 19 52 52 21 36 33 18 36 3 - 94 0 0 20 52 20 6 24 52 44 254 -68 21 4 34 20 40 8 22 24 55 19 22 32 - 95 0 0 21 40 36 6 25 8 45 252 -67 21 52 58 21 28 16 23 14 13 20 9 52 - 96 0 0 22 29 44 6 25 24 45 251 -66 22 42 15 22 17 17 24 4 24 20 58 4 - 97 0 0 23 19 44 6 25 40 46 250 -65 23 32 23 23 7 9 24 55 29 21 47 6 - 98 0 0 24 10 35 6 25 57 46 248 -64 24 23 23 23 57 51 25 47 27 22 36 56 - 99 0 0 25 2 16 6 26 13 47 247 -63 25 15 12 24 49 24 26 40 17 23 27 35 -100 0 0 25 54 46 6 26 30 47 245 -62 26 7 51 25 41 44 27 33 58 24 19 2 -101 0 0 26 48 3 6 26 47 47 243 -61 27 1 18 26 34 53 28 28 28 25 11 14 -102 0 0 27 42 7 6 27 5 48 242 -60 27 55 31 27 28 47 29 23 47 26 4 11 -103 0 0 28 36 56 6 27 22 48 240 -59 28 50 30 28 23 27 30 19 53 26 57 52 -104 0 0 29 32 29 6 27 39 48 238 -58 29 46 13 29 18 50 31 16 45 27 52 15 -105 0 0 30 28 44 6 27 57 48 236 -57 30 42 38 30 14 55 32 14 21 28 47 19 -106 0 0 31 25 40 6 28 15 48 234 -56 31 39 44 31 11 40 33 12 40 29 43 1 -107 0 0 32 23 14 6 28 33 49 232 -54 32 37 29 32 9 3 34 11 39 30 39 20 -108 0 0 33 21 24 6 28 50 49 231 -53 33 35 50 33 7 3 35 11 17 31 36 15 -109 0 0 34 20 9 6 29 8 48 229 -52 34 34 47 34 5 37 36 11 32 32 33 42 -110 0 0 35 19 26 6 29 26 48 227 -51 35 34 15 35 4 43 37 12 20 33 31 40 -111 0 0 36 19 13 6 29 44 48 225 -50 36 34 14 36 4 18 38 13 40 34 30 7 -112 0 0 37 19 27 6 30 2 48 223 -48 37 34 40 37 4 21 39 15 29 35 29 0 -113 0 0 38 20 6 6 30 19 48 221 -47 38 35 30 38 4 47 40 17 44 36 28 16 -114 0 0 39 21 6 6 30 37 47 219 -46 39 36 42 39 5 35 41 20 22 37 27 52 -115 0 0 40 22 24 6 30 55 47 217 -45 40 38 13 40 6 41 42 23 19 38 27 46 -116 0 0 41 23 56 6 31 12 47 215 -44 41 39 58 41 8 2 43 26 32 39 27 54 -117 0 0 42 25 41 6 31 29 46 213 -42 42 41 55 42 9 34 44 29 58 40 28 14 -118 0 0 43 27 33 6 31 46 46 212 -41 43 44 0 43 11 14 45 33 32 41 28 41 -119 0 0 44 29 29 6 32 3 45 210 -40 44 46 8 44 12 58 46 37 10 42 29 12 -120 0 0 45 31 25 6 32 20 45 208 -39 45 48 17 45 14 42 47 40 47 43 29 44 -121 0 0 46 33 17 6 32 36 44 206 -37 46 50 21 46 16 22 48 44 20 44 30 13 -122 0 0 47 35 0 6 32 52 43 205 -36 47 52 17 47 17 53 49 47 44 45 30 34 -123 0 0 48 36 31 6 33 7 43 203 -35 48 53 59 48 19 12 50 50 52 46 30 43 -124 0 0 49 37 44 6 33 23 42 202 -34 49 55 24 49 20 13 51 53 42 47 30 37 -125 0 0 50 38 34 6 33 38 41 200 -33 50 56 26 50 20 52 52 56 6 48 30 12 -126 0 0 51 38 58 6 33 52 40 199 -31 51 57 0 51 21 5 53 58 1 49 29 22 -127 0 0 52 38 50 6 34 7 40 197 -30 52 57 3 52 20 47 54 59 19 50 28 4 -128 0 0 53 38 5 6 34 20 39 196 -29 53 56 28 53 19 53 55 59 57 51 26 13 -129 0 0 54 36 40 6 34 34 38 194 -28 54 55 12 54 18 18 56 59 49 52 23 45 -130 0 0 55 34 28 6 34 47 37 193 -27 55 53 9 55 15 58 57 58 48 53 20 37 -131 0 0 56 31 26 6 34 59 36 192 -26 56 50 15 56 12 49 58 56 51 54 16 43 -132 0 0 57 27 29 6 35 11 36 190 -25 57 46 25 57 8 45 59 53 52 55 11 59 -133 0 0 58 22 33 6 35 23 35 189 -24 58 41 35 58 3 43 60 49 46 56 6 23 -134 0 0 59 16 33 6 35 34 34 188 -23 59 35 40 58 57 39 61 44 28 56 59 50 -135 0 0 60 9 27 6 35 45 33 187 -22 60 28 38 59 50 28 62 37 55 57 52 17 -136 0 0 61 1 10 6 35 55 32 185 -21 61 20 24 60 42 9 63 30 3 58 43 40 -137 0 0 61 51 40 6 36 5 31 184 -20 62 10 56 61 32 36 64 20 48 59 33 57 -138 0 0 62 40 53 6 36 14 31 183 -19 63 0 10 62 21 49 65 10 7 60 23 6 -139 0 0 63 28 48 6 36 23 30 182 -18 63 48 4 63 9 44 65 57 57 61 11 3 -140 0 0 64 15 22 6 36 31 29 181 -17 64 34 37 63 56 20 66 44 18 61 57 46 -141 0 0 65 0 34 6 36 39 28 180 -16 65 19 46 64 41 34 67 29 7 62 43 16 -142 0 0 65 44 23 6 36 47 28 179 -16 66 3 31 65 25 27 68 12 23 63 27 29 -143 0 0 66 26 47 6 36 54 27 178 -15 66 45 50 66 7 56 68 54 6 64 10 24 -144 0 0 67 7 47 6 37 0 26 176 -14 67 26 44 66 49 2 69 34 17 64 52 3 -145 0 0 67 47 23 6 37 7 26 175 -13 68 6 13 67 28 44 70 12 55 65 32 23 -146 0 0 68 25 35 6 37 13 25 174 -13 68 44 17 68 7 3 70 50 2 66 11 26 -147 0 0 69 2 23 6 37 18 24 173 -12 69 20 57 68 44 0 71 25 39 66 49 11 -148 0 0 69 37 50 6 37 24 24 172 -11 69 56 14 69 19 36 71 59 47 67 25 39 -149 0 0 70 11 55 6 37 29 23 171 -11 70 30 10 69 53 51 72 32 29 68 0 51 -150 0 0 70 44 42 6 37 33 22 170 -10 71 2 46 70 26 48 73 3 48 68 34 48 -151 0 0 71 16 10 6 37 38 22 169 -10 71 34 3 70 58 27 73 33 44 69 7 31 -152 0 0 71 46 24 6 37 42 21 168 -9 72 4 5 71 28 52 74 2 21 69 39 2 -153 0 0 72 15 23 6 37 46 21 167 -9 72 32 52 71 58 3 74 29 42 70 9 23 -154 0 0 72 43 12 6 37 50 20 166 -8 73 0 29 72 26 4 74 55 49 70 38 34 -155 0 0 73 9 51 6 37 53 20 165 -8 73 26 55 72 52 56 75 20 45 71 6 39 -156 0 0 73 35 24 6 37 57 19 164 -7 73 52 15 73 18 41 75 44 33 71 33 38 -157 0 0 73 59 53 6 38 0 19 163 -7 74 16 31 73 43 22 76 7 17 71 59 34 -158 0 0 74 23 20 6 38 2 18 162 -6 74 39 45 74 7 2 76 28 58 72 24 29 -159 0 0 74 45 47 6 38 5 18 161 -6 75 1 59 74 29 42 76 49 39 72 48 25 -160 0 0 75 7 17 6 38 8 17 160 -5 75 23 16 74 51 24 77 9 24 73 11 24 -161 0 0 75 27 52 6 38 10 17 159 -5 75 43 38 75 12 12 77 28 15 73 33 28 -162 0 0 75 47 34 6 38 12 17 158 -5 76 3 7 75 32 7 77 46 14 73 54 39 -163 0 0 76 6 27 6 38 15 16 157 -4 76 21 47 75 51 12 78 3 24 74 14 59 -164 0 0 76 24 31 6 38 17 16 156 -4 76 39 38 76 9 29 78 19 47 74 34 30 -165 0 0 76 41 49 6 38 19 16 155 -4 76 56 44 76 26 59 78 35 26 74 53 14 -166 0 0 76 58 23 6 38 20 15 154 -3 77 13 6 76 43 45 78 50 22 75 11 13 -167 0 0 77 14 14 6 38 22 15 153 -3 77 28 45 76 59 49 79 4 38 75 28 28 -168 0 0 77 29 26 6 38 24 15 152 -3 77 43 45 77 15 12 79 18 16 75 45 2 -169 0 0 77 43 59 6 38 25 14 151 -2 77 58 7 77 29 56 79 31 18 76 0 56 -170 0 0 77 57 56 6 38 27 14 150 -2 78 11 52 77 44 4 79 43 45 76 16 11 -171 0 0 78 11 17 6 38 28 14 149 -2 78 25 2 77 57 36 79 55 39 76 30 50 -172 0 0 78 24 5 6 38 29 13 148 -2 78 37 39 78 10 35 80 7 2 76 44 54 -173 0 0 78 36 21 6 38 31 13 147 -1 78 49 45 78 23 1 80 17 56 76 58 23 -174 0 0 78 48 6 6 38 32 13 146 -1 79 1 20 78 34 57 80 28 20 77 11 21 -175 0 0 78 59 23 6 38 33 12 145 -1 79 12 26 78 46 23 80 38 18 77 23 47 -176 0 0 79 10 11 6 38 34 12 144 -1 79 23 4 78 57 20 80 47 50 77 35 44 -177 0 0 79 20 32 6 38 35 12 143 0 79 33 16 79 7 51 80 56 58 77 47 12 -178 0 0 79 30 28 6 38 36 12 142 0 79 43 3 79 17 56 81 5 43 77 58 12 -179 0 0 79 39 59 6 38 37 11 141 0 79 52 26 79 27 36 81 14 5 78 8 47 Uncertainty in time = +/- 15 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 0231-01315-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 21 42.4762 DE: +03 23 18.883 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .022 ) * V mag [mag]: 10.1 * B mag [mag]: 11.2 * Apparent position with proper motion RA(deg): 140.5404457977 DE(deg): 3.3518534628 * Equation of equinoxes (radians) : 0.000040992576937 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2957) Tatsuo approx. diameter [km]: 26 approx. diameter ["]: .015 distance from Earth [AU]: 2.47100 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 683 number of rejected observations: 29 time covered by the observations: 1934 Feb 10 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.057, 0.040, 111° remarks: * orbital elements for (2957) Tatsuo : Mean anomaly = 203.91297021 deg Arg. of pericenter = 63.89549557 deg Long. of node = 249.64111271 deg Inclination = 8.68826594 deg Eccentricity = 0.08762312 Semimajor axis = 3.02291022 AU Perihelion dist = 2.75803338 AU Mag: H = 10.83, G = 0.15 Epoch of elements : MJD 54549.27000000 TDT (2008 Mar 24.270) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 24 2957 Tatsuo 6h 28.8m UT 10.1 9 21 42.476 3 23 18.88TYC 0231-01315-1 11.2 15.5 26 3.3 2.471 -0.784 10.19 -138.8691 3.386 84.38 1.59 6.4793 0.43233 0.49988 -3.30252 2.86339 0.00400 -0.00040 2000 202.1745852008 315.00000 63.895496249.641113 8.6882660.08762312 3.0229102 2.758033410.2 5.00.15 RATE 1.8752800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.045 107 4.23 0.049 0 54510.5020080324_1315-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org