IOTA/IOTA-ES occultation update for (111) Ate / 2UCAC 40319823 event on 2010 Mar 25, 03:43 UT Visible from Canada Summary ------- On 2010 Mar 25 UT, the 135 km diameter asteroid (111) Ate will occult a 12.9 mag star in the constellation Gemini for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 12.7 mag (the magnitude of the asteroid) for at most 6.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 93 * date and approx. time of event: 2010 Mar 25, 03:43 - 2010 Mar 25, 03:47 UT * magnitude of target star: 12.9 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 6.7 * Moon: 69 % sunlit, 26° distance * Sun: 87° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 195 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .041", 0° ) * approx speed of asteroid's shadow [km/s]: 19.9674 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 40319823 by 111 Ate on 2010 Mar 25 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 -139 0 0 70 39 58 3 43 37 43 191 0 69 45 59 71 34 53 68 54 58 72 28 32 -138 0 0 70 34 47 3 43 39 43 192 0 69 40 40 71 29 51 68 49 32 72 23 40 -137 0 0 70 29 23 3 43 41 43 193 -1 69 35 6 71 24 36 68 43 50 72 18 34 -136 0 0 70 23 43 3 43 43 43 195 -1 69 29 17 71 19 6 68 37 52 72 13 14 -135 0 0 70 17 48 3 43 45 43 196 -2 69 23 13 71 13 22 68 31 39 72 7 40 -134 0 0 70 11 39 3 43 47 43 197 -2 69 16 53 71 7 22 68 25 10 72 1 51 -133 0 0 70 5 13 3 43 49 43 198 -2 69 10 18 71 1 8 68 18 25 71 55 48 -132 0 0 69 58 33 3 43 51 43 200 -3 69 3 26 70 54 39 68 11 24 71 49 30 -131 0 0 69 51 36 3 43 53 43 201 -3 68 56 19 70 47 53 68 4 7 71 42 56 -130 0 0 69 44 23 3 43 55 43 202 -3 68 48 55 70 40 53 67 56 33 71 36 7 -129 0 0 69 36 55 3 43 57 43 204 -4 68 41 14 70 33 36 67 48 41 71 29 3 -128 0 0 69 29 9 3 43 59 43 205 -4 68 33 17 70 26 3 67 40 33 71 21 43 -127 0 0 69 21 7 3 44 1 43 206 -4 68 25 3 70 18 14 67 32 8 71 14 7 -126 0 0 69 12 48 3 44 4 43 207 -5 68 16 31 70 10 8 67 23 24 71 6 14 -125 0 0 69 4 11 3 44 6 43 209 -5 68 7 41 70 1 44 67 14 23 70 58 4 -124 0 0 68 55 17 3 44 8 43 210 -6 67 58 34 69 53 4 67 5 4 70 49 38 -123 0 0 68 46 5 3 44 10 43 211 -6 67 49 9 69 44 6 66 55 27 70 40 54 -122 0 0 68 36 34 3 44 12 43 213 -6 67 39 25 69 34 50 66 45 31 70 31 53 -121 0 0 68 26 46 3 44 15 43 214 -7 67 29 23 69 25 16 66 35 16 70 22 33 -120 0 0 68 16 38 3 44 17 43 215 -7 67 19 1 69 15 23 66 24 41 70 12 56 -119 0 0 68 6 12 3 44 19 43 217 -8 67 8 20 69 5 12 66 13 48 70 3 0 -118 0 0 67 55 26 3 44 21 43 218 -8 66 57 20 68 54 42 66 2 34 69 52 45 -117 0 0 67 44 21 3 44 24 43 219 -8 66 46 0 68 43 52 65 51 1 69 42 11 -116 0 0 67 32 55 3 44 26 43 221 -9 66 34 20 68 32 42 65 39 7 69 31 18 -115 0 0 67 21 10 3 44 29 42 222 -9 66 22 19 68 21 12 65 26 53 69 20 4 -114 0 0 67 9 4 3 44 31 42 223 -10 66 9 58 68 9 22 65 14 18 69 8 30 -113 0 0 66 56 36 3 44 33 42 225 -10 65 57 15 67 57 11 65 1 21 68 56 36 -112 0 0 66 43 48 3 44 36 42 226 -11 65 44 12 67 44 40 64 48 4 68 44 21 -111 0 0 66 30 38 3 44 38 42 227 -11 65 30 46 67 31 46 64 34 24 68 31 45 -110 0 0 66 17 7 3 44 41 42 229 -12 65 16 59 67 18 31 64 20 23 68 18 47 -109 0 0 66 3 13 3 44 43 42 230 -12 65 2 50 67 4 54 64 5 59 68 5 26 -108 0 0 65 48 57 3 44 46 41 231 -13 64 48 18 66 50 54 63 51 13 67 51 44 -107 0 0 65 34 18 3 44 49 41 233 -13 64 33 23 66 36 32 63 36 4 67 37 39 -106 0 0 65 19 15 3 44 51 41 234 -14 64 18 5 66 21 47 63 20 32 67 23 11 -105 0 0 65 3 50 3 44 54 41 235 -14 64 2 24 66 6 38 63 4 36 67 8 19 -104 0 0 64 48 1 3 44 57 41 236 -15 63 46 19 65 51 6 62 48 17 66 53 4 -103 0 0 64 31 48 3 44 59 41 238 -15 63 29 50 65 35 10 62 31 35 66 37 25 -102 0 0 64 15 11 3 45 2 40 239 -16 63 12 58 65 18 49 62 14 28 66 21 21 -101 0 0 63 58 9 3 45 5 40 240 -16 62 55 41 65 2 4 61 56 57 66 4 53 -100 0 0 63 40 43 3 45 7 40 242 -17 62 37 59 64 44 54 61 39 2 65 48 0 - 99 0 0 63 22 52 3 45 10 40 243 -17 62 19 53 64 27 19 61 20 42 65 30 41 - 98 0 0 63 4 36 3 45 13 39 244 -18 62 1 22 64 9 19 61 1 58 65 12 58 - 97 0 0 62 45 54 3 45 16 39 246 -18 61 42 26 63 50 53 60 42 49 64 54 48 - 96 0 0 62 26 48 3 45 19 39 247 -19 61 23 5 63 32 1 60 23 15 64 36 12 - 95 0 0 62 7 15 3 45 22 38 248 -19 61 3 19 63 12 44 60 3 16 64 17 10 - 94 0 0 61 47 17 3 45 25 38 249 -20 60 43 7 62 53 1 59 42 52 63 57 42 - 93 0 0 61 26 53 3 45 28 38 251 -20 60 22 30 62 32 51 59 22 2 63 37 48 - 92 0 0 61 6 4 3 45 31 37 252 -21 60 1 27 62 12 15 59 0 48 63 17 26 - 91 0 0 60 44 48 3 45 34 37 253 -22 59 39 59 61 51 13 58 39 9 62 56 38 - 90 0 0 60 23 7 3 45 37 37 254 -22 59 18 6 61 29 45 58 17 5 62 35 23 - 89 0 0 60 1 0 3 45 40 36 256 -23 58 55 47 61 7 50 57 54 35 62 13 42 - 88 0 0 59 38 27 3 45 43 36 257 -23 58 33 3 60 45 30 57 31 42 61 51 33 - 87 0 0 59 15 28 3 45 46 35 258 -24 58 9 54 60 22 42 57 8 23 61 28 58 - 86 0 0 58 52 5 3 45 49 35 259 -25 57 46 20 59 59 29 56 44 40 61 5 56 - 85 0 0 58 28 15 3 45 52 35 261 -25 57 22 21 59 35 50 56 20 33 60 42 27 - 84 0 0 58 4 1 3 45 55 34 262 -26 56 57 58 59 11 46 55 56 2 60 18 32 - 83 0 0 57 39 22 3 45 58 34 263 -27 56 33 11 58 47 15 55 31 7 59 54 11 - 82 0 0 57 14 18 3 46 1 33 264 -27 56 8 0 58 22 20 55 5 50 59 29 24 - 81 0 0 56 48 51 3 46 4 33 265 -28 55 42 26 57 57 0 54 40 9 59 4 12 - 80 0 0 56 22 59 3 46 7 32 266 -29 55 16 28 57 31 15 54 14 6 58 38 34 - 79 0 0 55 56 45 3 46 10 32 267 -29 54 50 8 57 5 6 53 47 41 58 12 32 - 78 0 0 55 30 8 3 46 13 31 269 -30 54 23 26 56 38 34 53 20 55 57 46 5 - 77 0 0 55 3 8 3 46 16 30 270 -30 53 56 23 56 11 39 52 53 48 57 19 14 - 76 0 0 54 35 47 3 46 19 30 271 -31 53 28 58 55 44 21 52 26 21 56 52 0 - 75 0 0 54 8 5 3 46 22 29 272 -32 53 1 14 55 16 42 51 58 34 56 24 23 - 74 0 0 53 40 3 3 46 25 29 273 -32 52 33 10 54 48 41 51 30 29 55 56 25 - 73 0 0 53 11 41 3 46 28 28 274 -33 52 4 47 54 20 21 51 2 6 55 28 5 - 72 0 0 52 43 1 3 46 31 27 275 -34 51 36 7 53 51 40 50 33 25 54 59 25 - 71 0 0 52 14 2 3 46 34 27 276 -34 51 7 9 53 22 41 50 4 28 54 30 25 - 70 0 0 51 44 47 3 46 37 26 277 -35 50 37 55 52 53 24 49 35 15 54 1 6 - 69 0 0 51 15 15 3 46 40 25 278 -36 50 8 26 52 23 50 49 5 48 53 31 30 - 68 0 0 50 45 28 3 46 42 25 279 -36 49 38 42 51 54 0 48 36 6 53 1 36 - 67 0 0 50 15 27 3 46 45 24 280 -37 49 8 44 51 23 55 48 6 12 52 31 27 - 66 0 0 49 45 13 3 46 48 23 281 -38 48 38 35 50 53 35 47 36 7 52 1 3 - 65 0 0 49 14 46 3 46 50 22 282 -38 48 8 13 50 23 3 47 5 50 51 30 25 - 64 0 0 48 44 9 3 46 53 22 283 -39 47 37 42 49 52 19 46 35 24 50 59 34 - 63 0 0 48 13 21 3 46 55 21 284 -40 47 7 1 49 21 25 46 4 49 50 28 32 - 62 0 0 47 42 25 3 46 58 20 284 -40 46 36 12 48 50 20 45 34 6 49 57 19 - 61 0 0 47 11 20 3 47 0 19 285 -41 46 5 15 48 19 8 45 3 17 49 25 58 - 60 0 0 46 40 10 3 47 2 18 286 -42 45 34 13 47 47 48 44 32 23 48 54 28 - 59 0 0 46 8 54 3 47 5 18 287 -42 45 3 7 47 16 22 44 1 25 48 22 52 - 58 0 0 45 37 33 3 47 7 17 288 -43 44 31 56 46 44 51 43 30 23 47 51 10 - 57 0 0 45 6 10 3 47 9 16 289 -43 44 0 43 46 13 16 42 59 19 47 19 24 - 56 0 0 44 34 45 3 47 11 15 289 -44 43 29 29 45 41 40 42 28 15 46 47 35 - 55 0 0 44 3 20 3 47 13 14 290 -44 42 58 15 45 10 2 41 57 11 46 15 45 - 54 0 0 43 31 55 3 47 14 13 291 -45 42 27 2 44 38 24 41 26 9 45 43 54 - 53 0 0 43 0 32 3 47 16 13 292 -45 41 55 51 44 6 48 40 55 9 45 12 4 - 52 0 0 42 29 12 3 47 18 12 292 -46 41 24 44 43 35 14 40 24 14 44 40 16 - 51 0 0 41 57 56 3 47 19 11 293 -46 40 53 42 43 3 45 39 53 23 44 8 32 - 50 0 0 41 26 46 3 47 20 10 294 -47 40 22 45 42 32 20 39 22 38 43 36 52 - 49 0 0 40 55 42 3 47 22 9 294 -47 39 51 55 42 1 2 38 52 1 43 5 19 - 48 0 0 40 24 47 3 47 23 8 295 -47 39 21 14 41 29 51 38 21 32 42 33 52 - 47 0 0 39 54 0 3 47 24 7 296 -48 38 50 41 40 58 48 37 51 12 42 2 34 - 46 0 0 39 23 23 3 47 25 6 296 -48 38 20 19 40 27 56 37 21 3 41 31 25 - 45 0 0 38 52 57 3 47 25 5 297 -48 37 50 8 39 57 15 .. .. .. 41 0 28 - 44 0 0 38 22 44 3 47 26 4 298 -49 37 20 10 39 26 45 .. .. .. 40 29 42 - 43 0 0 37 52 44 3 47 26 3 298 -49 36 50 25 38 56 29 .. .. .. 39 59 9 - 42 0 0 37 22 58 3 47 27 3 299 -49 36 20 54 38 26 27 .. .. .. 39 28 50 - 41 0 0 36 53 27 3 47 27 2 300 -49 35 51 39 37 56 40 .. .. .. 38 58 46 - 40 0 0 36 24 13 3 47 27 1 300 -49 35 22 40 37 27 9 .. .. .. 38 28 58 Uncertainty in time = +/- 3 secs Prediction of 2010 Mar 18.0 Data for the target star ------------------------ * name: 2UCAC 40319823 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 03 16.3017 DE: +24 20 07.433 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .041 ) * V mag [mag]: 12.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (111) Ate approx. diameter [km]: 135 approx. diameter ["]: .086 distance from Earth [AU]: 2.16500 * orbital information: orbit source: Preston date of fit: 2010 Mar 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1114 number of rejected observations: 111 time covered by the observations: 1908 Sep 21 - 2010 Mar 18 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 96° remarks: * orbital elements for (111) Ate : Mean anomaly = 2.52978417 deg Arg. of pericenter = 167.10172999 deg Long. of node = 305.79815780 deg Inclination = 4.93105399 deg Eccentricity = 0.10253271 Semimajor axis = 2.59394104 AU Perihelion dist = 2.32797722 AU Mag: H = 8.08, G = 0.15 Epoch of elements : MJD 55280.15500000 TDT (2010 Mar 25.155) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Mar 25 111 Ate 3h 43.8m UT 12.9 6 3 16.302 24 20 7.432UCAC 40319823 0.0 12.7 135 6.7 2.165 3.329 -5.00 -147.6358 24.338 125.58 1.75 3.7300 0.08203 0.71754 11.20270 -1.23128 0.00556 -0.00003 2000 2.4932162010 325.00000167.101730305.798158 4.9310540.10253271 2.5939410 2.3279772 8.0 5.00.15 RATE 2.3591960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.041 0 1.48 0.041 0 055273.0020100325_319823 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2010 Mar 18, 16:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org