IOTA/IOTA-ES occultation update for (861) Aida / 2UCAC 25789086 event on 2008 Jul 05, 06:15 UT Visible from S USA, Mexico Summary ------- On 2008 Jul 05 UT, the 67 km diameter asteroid (861) Aida will occult a 13.1 mag star in the constellation Ophiuchus for observers along a path across S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 14.1 mag (the magnitude of the asteroid) for at most 7.9 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: . The event at a glimpse ---------------------- * Rank: 75 * date and approx. time of event: 2008 Jul 05, 06:02 - 2008 Jul 05, 06:22 UT * midpoint of event [JD]: 2454652.75944167 * magnitude of target star: 13.1 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 7.9 * Moon: 7 % sunlit, 120° distance * Sun: 149° distance * rough path description: S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .034", 95° ) * approx speed of asteroid's shadow [km/s]: 8.4485 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 25789086 by 861 Aida on 2008 Jul 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 ' " Latitude Latitude Latitude Latitude 179 0 0 7 19 9 6 22 16 32 114 0 7 40 15 6 58 8 8 12 3 6 26 43 180 0 0 7 16 9 6 22 8 32 114 -1 7 37 15 6 55 8 8 9 2 6 23 45 -179 0 0 7 13 36 6 22 0 33 115 -2 7 34 41 6 52 36 8 6 27 6 21 13 -178 0 0 7 11 29 6 21 52 34 115 -3 7 32 33 6 50 29 8 4 18 6 19 8 -177 0 0 7 9 49 6 21 43 35 115 -4 7 30 52 6 48 49 8 2 37 6 17 28 -176 0 0 7 8 35 6 21 35 36 116 -5 7 29 38 6 47 36 8 1 22 6 16 15 -175 0 0 7 7 47 6 21 26 37 116 -6 7 28 50 6 46 48 8 0 33 6 15 28 -174 0 0 7 7 25 6 21 18 38 117 -7 7 28 28 6 46 27 8 0 11 6 15 8 -173 0 0 7 7 30 6 21 9 39 117 -7 7 28 33 6 46 32 8 0 16 6 15 13 -172 0 0 7 8 2 6 20 59 39 118 -8 7 29 4 6 47 3 8 0 47 6 15 44 -171 0 0 7 8 59 6 20 50 40 118 -9 7 30 1 6 48 1 8 1 44 6 16 41 -170 0 0 7 10 22 6 20 41 41 119 -10 7 31 25 6 49 24 8 3 7 6 18 5 -169 0 0 7 12 11 6 20 31 42 119 -11 7 33 14 6 51 13 8 4 57 6 19 54 -168 0 0 7 14 27 6 20 21 43 120 -12 7 35 30 6 53 28 8 7 13 6 22 8 -167 0 0 7 17 8 6 20 11 44 120 -13 7 38 11 6 56 9 8 9 55 6 24 49 -166 0 0 7 20 15 6 20 1 44 121 -13 7 41 19 6 59 16 8 13 3 6 27 55 -165 0 0 7 23 48 6 19 51 45 122 -14 7 44 52 7 2 48 8 16 36 6 31 27 -164 0 0 7 27 46 6 19 41 46 122 -15 7 48 51 7 6 46 8 20 36 6 35 24 -163 0 0 7 32 10 6 19 30 47 123 -16 7 53 15 7 11 9 8 25 1 6 39 46 -162 0 0 7 36 59 6 19 20 47 124 -17 7 58 5 7 15 58 8 29 52 6 44 34 -161 0 0 7 42 14 6 19 9 48 125 -17 8 3 21 7 21 12 8 35 9 6 49 47 -160 0 0 7 47 54 6 18 58 49 126 -18 8 9 2 7 26 52 8 40 51 6 55 26 -159 0 0 7 54 0 6 18 47 50 126 -19 8 15 8 7 32 56 8 46 59 7 1 29 -158 0 0 8 0 30 6 18 36 50 127 -20 8 21 39 7 39 26 8 53 31 7 7 57 -157 0 0 8 7 26 6 18 25 51 128 -21 8 28 36 7 46 20 9 0 29 7 14 50 -156 0 0 8 14 46 6 18 14 52 129 -21 8 35 57 7 53 40 9 7 53 7 22 8 -155 0 0 8 22 32 6 18 2 52 130 -22 8 43 44 8 1 24 9 15 41 7 29 51 -154 0 0 8 30 42 6 17 51 53 131 -23 8 51 55 8 9 33 9 23 54 7 37 58 -153 0 0 8 39 16 6 17 39 53 132 -24 9 0 31 8 18 6 9 32 31 7 46 29 -152 0 0 8 48 15 6 17 28 54 134 -24 9 9 31 8 27 4 9 41 34 7 55 25 -151 0 0 8 57 39 6 17 16 55 135 -25 9 18 56 8 36 26 9 51 0 8 4 45 -150 0 0 9 7 26 6 17 4 55 136 -26 9 28 45 8 46 12 10 0 52 8 14 29 -149 0 0 9 17 38 6 16 52 56 137 -27 9 38 58 8 56 22 10 11 7 8 24 38 -148 0 0 9 28 14 6 16 40 56 139 -27 9 49 35 9 6 57 10 21 47 8 35 9 -147 0 0 9 39 13 6 16 28 57 140 -28 10 0 36 9 17 54 10 32 50 8 46 5 -146 0 0 9 50 36 6 16 16 57 142 -29 10 12 1 9 29 16 10 44 18 8 57 24 -145 0 0 10 2 23 6 16 3 57 143 -29 10 23 50 9 41 1 10 56 9 9 9 7 -144 0 0 10 14 33 6 15 51 58 145 -30 10 36 1 9 53 9 11 8 23 9 21 12 -143 0 0 10 27 6 6 15 39 58 146 -31 10 48 37 10 5 41 11 21 1 9 33 41 -142 0 0 10 40 3 6 15 26 59 148 -31 11 1 35 10 18 35 11 34 2 9 46 33 -141 0 0 10 53 22 6 15 14 59 150 -32 11 14 56 10 31 52 11 47 26 9 59 47 -140 0 0 11 7 3 6 15 1 59 151 -33 11 28 40 10 45 32 12 1 13 10 13 24 -139 0 0 11 21 8 6 14 49 59 153 -33 11 42 46 10 59 34 12 15 22 10 27 23 -138 0 0 11 35 34 6 14 36 59 155 -34 11 57 14 11 13 59 12 29 54 10 41 45 -137 0 0 11 50 23 6 14 24 60 157 -34 12 12 5 11 28 45 12 44 48 10 56 28 -136 0 0 12 5 33 6 14 11 60 158 -35 12 27 18 11 43 54 13 0 4 11 11 33 -135 0 0 12 21 5 6 13 59 60 160 -35 12 42 52 11 59 24 13 15 42 11 27 0 -134 0 0 12 36 59 6 13 46 60 162 -36 12 58 48 12 15 15 13 31 41 11 42 48 -133 0 0 12 53 14 6 13 33 60 164 -37 13 15 5 12 31 27 13 48 1 11 58 57 -132 0 0 13 9 49 6 13 20 60 166 -37 13 31 43 12 48 1 14 4 43 12 15 27 -131 0 0 13 26 46 6 13 8 60 168 -38 13 48 42 13 4 55 14 21 45 12 32 18 -130 0 0 13 44 2 6 12 55 60 170 -38 14 6 1 13 22 9 14 39 8 12 49 29 -129 0 0 14 1 39 6 12 42 60 171 -38 14 23 40 13 39 44 14 56 51 13 7 0 -128 0 0 14 19 36 6 12 30 59 173 -39 14 41 39 13 57 38 15 14 54 13 24 50 -127 0 0 14 37 52 6 12 17 59 175 -39 14 59 58 14 15 52 15 33 16 13 43 1 -126 0 0 14 56 28 6 12 4 59 177 -40 15 18 36 14 34 25 15 51 58 14 1 30 -125 0 0 15 15 23 6 11 52 59 179 -40 15 37 33 14 53 17 16 10 59 14 20 18 -124 0 0 15 34 36 6 11 39 58 180 -40 15 56 49 15 12 28 16 30 19 14 39 25 -123 0 0 15 54 7 6 11 27 58 182 -41 16 16 23 15 31 57 16 49 57 14 58 51 -122 0 0 16 13 57 6 11 14 58 184 -41 16 36 15 15 51 44 17 9 53 15 18 34 -121 0 0 16 34 4 6 11 2 57 186 -41 16 56 25 16 11 48 17 30 7 15 38 35 -120 0 0 16 54 28 6 10 50 57 187 -42 17 16 52 16 32 10 17 50 38 15 58 53 -119 0 0 17 15 10 6 10 37 56 189 -42 17 37 36 16 52 49 18 11 25 16 19 28 -118 0 0 17 36 7 6 10 25 56 190 -42 17 58 36 17 13 44 18 32 30 16 40 19 -117 0 0 17 57 21 6 10 13 55 192 -42 18 19 53 17 34 55 18 53 50 17 1 27 -116 0 0 18 18 51 6 10 1 55 193 -42 18 41 25 17 56 22 19 15 26 17 22 50 -115 0 0 18 40 36 6 9 49 54 195 -43 19 3 12 18 18 5 19 37 18 17 44 28 -114 0 0 19 2 35 6 9 37 54 196 -43 19 25 14 18 40 2 19 59 24 18 6 22 -113 0 0 19 24 49 6 9 25 53 197 -43 19 47 31 19 2 13 20 21 45 18 28 29 -112 0 0 19 47 17 6 9 13 52 199 -43 20 10 2 19 24 39 20 44 19 18 50 51 -111 0 0 20 9 59 6 9 1 52 200 -43 20 32 46 19 47 18 21 7 7 19 13 26 -110 0 0 20 32 53 6 8 50 51 201 -43 20 55 43 20 10 10 21 30 8 19 36 15 -109 0 0 20 56 0 6 8 38 50 202 -43 21 18 52 20 33 14 21 53 21 19 59 16 -108 0 0 21 19 19 6 8 27 50 203 -43 21 42 14 20 56 31 22 16 47 20 22 28 -107 0 0 21 42 50 6 8 16 49 204 -43 22 5 47 21 19 59 22 40 23 20 45 53 -106 0 0 22 6 32 6 8 5 48 206 -43 22 29 31 21 43 38 23 4 11 21 9 29 -105 0 0 22 30 24 6 7 54 48 207 -43 22 53 25 22 7 28 23 28 9 21 33 15 -104 0 0 22 54 26 6 7 43 47 208 -43 23 17 30 22 31 27 23 52 17 21 57 11 -103 0 0 23 18 37 6 7 33 46 209 -43 23 41 43 22 55 37 24 16 34 22 21 17 -102 0 0 23 42 57 6 7 22 45 210 -42 24 6 6 23 19 54 24 41 0 22 45 32 -101 0 0 24 7 25 6 7 12 44 210 -42 24 30 36 23 44 21 25 5 34 23 9 55 -100 0 0 24 32 2 6 7 1 44 211 -42 24 55 15 24 8 55 25 30 16 23 34 25 - 99 0 0 24 56 45 6 6 51 43 212 -42 25 20 0 24 33 36 25 55 4 23 59 4 - 98 0 0 25 21 34 6 6 42 42 213 -41 25 44 52 24 58 24 26 19 59 24 23 48 - 97 0 0 25 46 30 6 6 32 41 214 -41 26 9 49 25 23 17 26 44 59 24 48 39 - 96 0 0 26 11 31 6 6 22 40 215 -41 26 34 52 25 48 16 27 10 5 25 13 35 - 95 0 0 26 36 37 6 6 13 39 216 -41 26 59 59 26 13 20 27 35 15 25 38 37 - 94 0 0 27 1 46 6 6 4 39 216 -40 27 25 11 26 38 28 28 0 29 26 3 42 - 93 0 0 27 26 59 6 5 55 38 217 -40 27 50 26 27 3 39 28 25 47 26 28 51 - 92 0 0 27 52 15 6 5 46 37 218 -39 28 15 43 27 28 54 28 51 7 26 54 3 - 91 0 0 28 17 33 6 5 38 36 219 -39 28 41 3 27 54 10 29 16 29 27 19 17 - 90 0 0 28 42 53 6 5 29 35 219 -39 29 6 24 28 19 29 29 41 52 27 44 34 - 89 0 0 29 8 14 6 5 21 34 220 -38 29 31 46 28 44 48 30 7 16 28 9 51 - 88 0 0 29 33 35 6 5 13 33 221 -38 29 57 8 29 10 8 30 32 40 28 35 9 - 87 0 0 29 58 55 6 5 5 33 222 -37 30 22 29 29 35 27 30 58 3 29 0 27 - 86 0 0 30 24 15 6 4 58 32 222 -37 30 47 50 30 0 46 31 23 25 29 25 44 - 85 0 0 30 49 33 6 4 50 31 223 -36 31 13 9 30 26 3 31 48 46 29 50 59 - 84 0 0 31 14 48 6 4 43 30 224 -36 31 38 25 30 51 17 32 14 3 30 16 13 - 83 0 0 31 40 1 6 4 36 29 224 -35 32 3 39 31 16 29 32 39 18 30 41 24 - 82 0 0 32 5 10 6 4 29 28 225 -35 32 28 49 31 41 38 33 4 29 31 6 32 - 81 0 0 32 30 15 6 4 23 27 226 -34 32 53 54 32 6 43 33 29 35 31 31 35 - 80 0 0 32 55 16 6 4 16 26 226 -34 33 18 55 32 31 43 33 54 37 31 56 35 - 79 0 0 33 20 11 6 4 10 26 227 -33 33 43 50 32 56 37 34 19 32 32 21 29 - 78 0 0 33 45 0 6 4 4 25 228 -33 34 8 40 33 21 26 34 44 22 32 46 18 - 77 0 0 34 9 42 6 3 59 24 228 -32 34 33 22 33 46 9 35 9 5 33 11 0 - 76 0 0 34 34 18 6 3 53 23 229 -31 34 57 58 34 10 44 35 33 40 33 35 35 - 75 0 0 34 58 45 6 3 48 22 230 -31 35 22 25 34 35 12 35 58 7 34 0 3 - 74 0 0 35 23 4 6 3 43 21 230 -30 35 46 44 34 59 31 36 22 26 34 24 23 - 73 0 0 35 47 15 6 3 38 20 231 -30 36 10 54 35 23 42 36 46 35 34 48 35 - 72 0 0 36 11 16 6 3 34 19 232 -29 36 34 54 35 47 44 37 10 35 35 12 37 - 71 0 0 36 35 7 6 3 29 19 232 -28 36 58 45 36 11 35 37 34 24 35 36 29 - 70 0 0 36 58 47 6 3 25 18 233 -28 37 22 25 36 35 16 37 58 3 36 0 12 - 69 0 0 37 22 17 6 3 21 17 234 -27 37 45 53 36 58 47 38 21 30 36 23 43 - 68 0 0 37 45 35 6 3 17 16 234 -26 38 9 11 37 22 6 38 44 46 36 47 4 - 67 0 0 38 8 41 6 3 14 15 235 -26 38 32 16 37 45 13 39 7 50 37 10 12 - 66 0 0 38 31 35 6 3 10 14 235 -25 38 55 8 38 8 8 39 30 40 37 33 9 - 65 0 0 38 54 16 6 3 7 13 236 -24 39 17 48 38 30 50 39 53 18 37 55 53 - 64 0 0 39 16 44 6 3 4 13 237 -24 39 40 14 38 53 19 40 15 42 38 18 24 - 63 0 0 39 38 57 6 3 2 12 237 -23 40 2 27 39 15 34 40 37 52 38 40 41 - 62 0 0 40 0 57 6 2 59 11 238 -22 40 24 25 39 37 36 40 59 48 39 2 45 - 61 0 0 40 22 42 6 2 57 10 239 -22 40 46 8 39 59 23 41 21 29 39 24 34 - 60 0 0 40 44 13 6 2 55 9 239 -21 41 7 37 40 20 55 41 42 55 39 46 9 - 59 0 0 41 5 28 6 2 53 8 240 -20 41 28 50 40 42 12 42 4 5 40 7 28 - 58 0 0 41 26 27 6 2 51 8 241 -20 41 49 48 41 3 13 42 25 0 40 28 33 - 57 0 0 41 47 11 6 2 49 7 241 -19 42 10 29 41 23 58 42 45 38 40 49 21 - 56 0 0 42 7 38 6 2 48 6 242 -18 42 30 54 41 44 28 43 6 0 41 9 54 - 55 0 0 42 27 49 6 2 47 5 243 -18 42 51 3 42 4 41 43 26 6 41 30 10 - 54 0 0 42 47 43 6 2 46 4 243 -17 43 10 55 42 24 37 43 45 54 41 50 9 - 53 0 0 43 7 20 6 2 45 4 244 -16 43 30 30 42 44 17 44 5 25 42 9 52 - 52 0 0 43 26 40 6 2 44 3 245 -16 43 49 47 43 3 39 44 24 39 42 29 18 - 51 0 0 43 45 42 6 2 44 2 245 -15 44 8 47 43 22 43 44 43 35 42 48 26 - 50 0 0 44 4 27 6 2 44 1 246 -14 44 27 29 43 41 31 45 2 13 43 7 17 - 49 0 0 44 22 54 6 2 43 0 247 -13 44 45 53 44 0 0 45 20 33 43 25 50 Uncertainty in time = +/- 6 secs [Prediction of 2008 Jun 27.0] Data for the target star ------------------------ * name: 2UCAC 25789086 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 48 35.7848 DE: -16 06 23.106 * position source: Pos: TMO, pm: , pi: * standard error: RA,DE ["]: ( .030, .030 ) * V mag [mag]: 13.1 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 252.2793346114 DE(deg): -16.1233008415 * Equation of equinoxes (radians) : 0.000051931352937 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (861) Aida approx. diameter [km]: 67 approx. diameter ["]: .046 distance from Earth [AU]: 1.98700 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 842 number of rejected observations: 58 time covered by the observations: 1906 Jan 24 - 2008 Jun 16 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.016, 103° remarks: * orbital elements for (861) Aida : Mean anomaly = 320.16158729 deg Arg. of pericenter = 196.08098024 deg Long. of node = 115.08601902 deg Inclination = 8.05358414 deg Eccentricity = 0.10445662 Semimajor axis = 3.14059424 AU Perihelion dist = 2.81253837 AU Mag: H = 9.61, G = 0.15 Epoch of elements : MJD 54652.26000000 TDT (2008 Jul 05.260) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 5 861 Aida 6h 13.6m UT 13.1 16 48 35.785-16 6 23.112UCAC 25789086 0.0 14.1 67 7.9 1.987 -1.402 -6.03 -124.8679 -16.104 87.76 22.74 6.2266 -0.14357 0.47982 -4.56991 -1.36202 0.00279 -0.00088 2000 319.7613712008 7 3.00000196.080980115.086019 8.0535840.10445662 3.1405942 2.8125384 9.6 5.00.15 RATE 1.7708680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.034 95 1.75 0.034 0 54644.5020080705_789086 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 27, 16:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org