IOTA/IOTA-ES occultation update for (96) Aegle / TYC 7916-01971-1 event on 2008 Jul 02, 16:23 UT Visible from Japan, Taiwan, China Summary ------- On 2008 Jul 02 UT, the 170 km diameter asteroid (96) Aegle will occult a 11.6 mag star in the constellation Corona Australis for observers along a path across Japan, Taiwan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.3 mag (the magnitude of the asteroid) for at most 12.4 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: 99 * date and approx. time of event: 2008 Jul 02, 16:19 - 2008 Jul 02, 16:26 UT * midpoint of event [JD]: 2454650.1828125 * magnitude of target star: 11.6 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 12.4 * Moon: 0 % sunlit, 168° distance * Sun: 164° distance * rough path description: Japan, Taiwan, China The occultation path -------------------- * approximate projected width [km]: 368 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .030", 81° ) * approx speed of asteroid's shadow [km/s]: 13.7476 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7916-01971-1 by 96 Aegle on 2008 Jul 2 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 88 56 51 48 0 0 16 26 48 0 160 -16 91 44 5 ... .. .. 93 22 9 ... .. .. 89 32 12 47 0 0 16 26 47 2 160 -17 92 18 19 86 54 37 93 55 47 ... .. .. 90 9 56 46 0 0 16 26 47 3 161 -18 92 55 14 87 33 15 94 32 18 ... .. .. 90 50 3 45 0 0 16 26 46 4 161 -19 93 34 51 88 14 1 95 11 42 ... .. .. 91 32 36 44 0 0 16 26 44 5 162 -20 94 17 11 88 56 58 95 54 3 ... .. .. 92 17 38 43 0 0 16 26 42 6 162 -21 95 2 20 89 42 6 96 39 23 88 18 24 93 5 12 42 0 0 16 26 40 7 163 -22 95 50 22 90 29 31 97 27 50 89 5 49 93 55 25 41 0 0 16 26 38 8 163 -23 96 41 23 91 19 16 98 19 32 89 55 26 94 48 22 40 0 0 16 26 34 9 164 -25 97 35 33 92 11 28 99 14 38 90 47 20 95 44 14 39 0 0 16 26 31 11 164 -26 98 33 3 93 6 12 100 13 22 91 41 37 96 43 9 38 0 0 16 26 26 12 165 -27 99 34 5 94 3 37 101 15 59 92 38 24 97 45 21 37 0 0 16 26 22 13 166 -28 100 38 58 95 3 54 102 22 51 93 37 51 98 51 4 36 0 0 16 26 16 14 167 -29 101 48 2 96 7 14 103 34 23 94 40 8 100 0 39 35 0 0 16 26 10 15 168 -31 103 1 43 97 13 52 104 51 7 95 45 28 101 14 29 34 0 0 16 26 4 16 168 -32 104 20 36 98 24 6 106 13 48 96 54 6 102 33 2 33 0 0 16 25 56 18 169 -33 105 45 23 99 38 15 107 43 20 98 6 20 103 56 57 32 0 0 16 25 48 19 170 -34 107 17 2 100 56 48 109 21 2 99 22 33 105 27 1 31 0 0 16 25 39 20 172 -35 108 56 52 102 20 17 111 8 44 100 43 12 107 4 19 30 0 0 16 25 28 21 173 -37 110 46 44 103 49 25 113 9 13 102 8 52 108 50 20 29 0 0 16 25 17 22 174 -38 112 49 26 105 25 5 115 27 1 103 40 17 110 47 10 28 0 0 16 25 3 23 176 -39 115 9 33 107 8 33 118 10 34 105 18 25 112 58 6 27 0 0 16 24 48 25 178 -40 117 55 35 109 1 30 121 39 34 107 4 32 Latitude Latitude Latitude Latitude 113 0 0 26 59 11 16 24 48 25 178 -40 28 55 10 25 11 4 30 4 20 24 13 23 114 0 0 26 34 11 16 24 41 25 178 -41 28 28 41 24 47 17 29 36 51 23 50 11 115 0 0 26 10 41 16 24 34 25 179 -41 28 3 49 24 24 53 29 11 4 23 28 20 116 0 0 25 48 39 16 24 27 26 180 -41 27 40 32 24 3 52 28 46 56 23 7 49 117 0 0 25 28 3 16 24 19 26 181 -42 27 18 47 23 44 13 28 24 26 22 48 37 118 0 0 25 8 52 16 24 12 26 182 -42 26 58 34 23 25 54 28 3 31 22 30 43 119 0 0 24 51 5 16 24 5 27 183 -42 26 39 49 23 8 53 27 44 9 22 14 6 120 0 0 24 34 40 16 23 58 27 183 -42 26 22 33 22 53 12 27 26 19 21 58 45 121 0 0 24 19 36 16 23 50 27 184 -42 26 6 43 22 38 47 27 9 58 21 44 39 122 0 0 24 5 54 16 23 43 27 185 -43 25 52 18 22 25 39 26 55 6 21 31 49 123 0 0 23 53 31 16 23 36 27 186 -43 25 39 18 22 13 47 26 41 41 21 20 12 124 0 0 23 42 26 16 23 28 27 187 -43 25 27 41 22 3 10 26 29 43 21 9 49 125 0 0 23 32 40 16 23 21 27 188 -43 25 17 26 21 53 48 26 19 9 21 0 39 126 0 0 23 24 12 16 23 14 27 189 -43 25 8 34 21 45 41 26 10 1 20 52 41 127 0 0 23 17 1 16 23 7 27 189 -42 25 1 2 21 38 47 26 2 16 20 45 56 128 0 0 23 11 7 16 22 59 27 190 -42 24 54 52 21 33 7 25 55 55 20 40 23 129 0 0 23 6 30 16 22 52 27 191 -42 24 50 1 21 28 40 25 50 56 20 36 2 130 0 0 23 3 9 16 22 45 27 192 -42 24 46 31 21 25 27 25 47 20 20 32 52 131 0 0 23 1 4 16 22 38 27 193 -42 24 44 21 21 23 26 25 45 6 20 30 53 132 0 0 23 0 15 16 22 31 27 194 -41 24 43 31 21 22 38 25 44 15 20 30 6 133 0 0 23 0 42 16 22 24 27 194 -41 24 44 0 21 23 4 25 44 46 20 30 31 134 0 0 23 2 25 16 22 17 26 195 -41 24 45 49 21 24 42 25 46 39 20 32 7 135 0 0 23 5 25 16 22 10 26 196 -40 24 48 59 21 27 34 25 49 55 20 34 54 136 0 0 23 9 42 16 22 3 26 197 -40 24 53 29 21 31 39 25 54 34 20 38 54 137 0 0 23 15 15 16 21 56 25 198 -39 24 59 19 21 36 57 26 0 35 20 44 5 138 0 0 23 22 5 16 21 49 25 198 -39 25 6 31 21 43 30 26 8 1 20 50 29 139 0 0 23 30 13 16 21 43 25 199 -38 25 15 5 21 51 17 26 16 51 20 58 5 140 0 0 23 39 40 16 21 36 24 200 -38 25 25 1 22 0 19 26 27 6 21 6 55 141 0 0 23 50 25 16 21 30 24 201 -37 25 36 20 22 10 36 26 38 48 21 16 58 142 0 0 24 2 31 16 21 23 23 201 -37 25 49 3 22 22 9 26 51 56 21 28 15 143 0 0 24 15 56 16 21 17 23 202 -36 26 3 12 22 34 59 27 6 33 21 40 47 144 0 0 24 30 43 16 21 11 22 203 -35 26 18 47 22 49 6 27 22 39 21 54 35 145 0 0 24 46 53 16 21 5 21 203 -35 26 35 49 23 4 32 27 40 16 22 9 39 146 0 0 25 4 26 16 20 59 21 204 -34 26 54 21 23 21 17 27 59 26 22 26 1 147 0 0 25 23 24 16 20 53 20 205 -33 27 14 23 23 39 22 28 20 11 22 43 40 148 0 0 25 43 48 16 20 48 19 205 -32 27 35 57 23 58 49 28 42 32 23 2 38 149 0 0 26 5 41 16 20 42 19 206 -31 27 59 6 24 19 38 29 6 33 23 22 57 150 0 0 26 29 2 16 20 37 18 207 -31 28 23 52 24 41 52 29 32 14 23 44 38 151 0 0 26 53 56 16 20 32 17 207 -30 28 50 16 25 5 31 29 59 41 24 7 41 152 0 0 27 20 22 16 20 27 16 208 -29 29 18 23 25 30 37 30 28 55 24 32 8 153 0 0 27 48 24 16 20 22 16 209 -28 29 48 14 25 57 12 31 0 0 24 58 1 154 0 0 28 18 5 16 20 17 15 209 -27 30 19 53 26 25 18 31 33 0 25 25 22 155 0 0 28 49 26 16 20 13 14 210 -26 30 53 24 26 54 57 32 8 1 25 54 12 156 0 0 29 22 32 16 20 9 13 210 -25 31 28 51 27 26 12 32 45 7 26 24 34 157 0 0 29 57 24 16 20 5 12 211 -24 32 6 19 27 59 4 33 24 24 26 56 29 158 0 0 30 34 8 16 20 1 11 212 -23 32 45 53 28 33 36 34 6 0 27 30 0 159 0 0 31 12 47 16 19 58 10 212 -22 33 27 40 29 9 52 34 50 2 28 5 10 160 0 0 31 53 26 16 19 55 9 213 -21 34 11 46 29 47 56 35 36 40 28 42 1 161 0 0 32 36 11 16 19 52 8 213 -20 34 58 21 30 27 49 36 26 5 29 20 36 162 0 0 33 21 6 16 19 49 7 214 -19 35 47 33 31 9 38 37 18 31 30 1 0 163 0 0 34 8 20 16 19 47 6 214 -18 36 39 34 31 53 26 38 14 15 30 43 15 164 0 0 34 58 0 16 19 45 5 215 -17 37 34 39 32 39 18 39 13 36 31 27 26 165 0 0 35 50 16 16 19 44 4 216 -15 38 33 5 33 27 21 .. .. .. 32 13 38 166 0 0 36 45 19 16 19 43 2 216 -14 39 35 12 34 17 42 .. .. .. 33 1 56 167 0 0 37 43 21 16 19 42 1 217 -13 .. .. .. 35 10 27 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: TYC 7916-01971-1 * constellation : Corona Australis * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 51 44.7351 DE: -38 35 19.703 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .026 ) * V mag [mag]: 11.6 * B mag [mag]: 12.5 * Apparent position with proper motion RA(deg): 283.0934226436 DE(deg): -38.5791039338 * Equation of equinoxes (radians) : 0.000050249134899 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (96) Aegle approx. diameter [km]: 170 approx. diameter ["]: .108 distance from Earth [AU]: 2.16100 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 618 number of rejected observations: 103 time covered by the observations: 1911 Mar 23 - 2008 May 19 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 72° remarks: * orbital elements for (96) Aegle : Mean anomaly = 95.47852633 deg Arg. of pericenter = 207.60909766 deg Long. of node = 321.74381798 deg Inclination = 15.94543925 deg Eccentricity = 0.13241192 Semimajor axis = 3.06188498 AU Perihelion dist = 2.65645490 AU Mag: H = 7.60, G = 0.15 Epoch of elements : MJD 54649.68300000 TDT (2008 Jul 02.683) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 2 96 Aegle 16h 23.3m UT 11.6 18 51 44.735-38 35 19.70TYC 7916-01971-1 12.5 12.3 170 12.4 2.161 -2.652 5.48 116.0449 -38.589 -64.77 22.97 16.3875 0.15372 0.87328 -7.64224 1.34416 -0.00009 0.00152 2000 93.6972522008 623.00000207.609098321.743818 15.9454390.13241192 3.0618850 2.6564549 7.7 5.00.15 RATE 1.8395890 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.030 81 1.28 0.030 0 54612.5020080702_1971-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 14:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org