IOTA/IOTA-ES occultation update for (23) Thalia / 2UCAC 21835207 event on 2008 Feb 01, 23:12 UT Visible from China Summary ------- On 2008 Feb 01 UT, the 108 km diameter asteroid (23) Thalia will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 12.8 mag (the magnitude of the asteroid) for at most 2.9 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: 86 * date and approx. time of event: 2008 Feb 01, 23:10 - 2008 Feb 01, 23:14 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 2.9 * Moon: 25 % sunlit, 18° distance * Sun: 43° distance * rough path description: China The occultation path -------------------- * approximate projected width [km]: 153 * 1 sigma uncertainty interval [path widths]: +/- 0.58 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .025", 91° ) * approx speed of asteroid's shadow [km/s]: 37.1634 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 21835207 by 23 Thalia on 2008 Feb 01 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 88 0 0 44 12 48 23 10 2 1 126 -24 43 22 16 .. .. .. .. .. .. .. .. .. 89 0 0 43 41 35 23 10 2 1 127 -24 42 51 10 44 32 56 .. .. .. 45 33 45 90 0 0 43 10 20 23 10 3 2 128 -23 42 20 3 44 1 33 .. .. .. 45 2 12 91 0 0 42 39 4 23 10 3 3 128 -22 41 48 55 43 30 8 .. .. .. 44 30 37 92 0 0 42 7 48 23 10 3 4 129 -21 41 17 47 42 58 43 .. .. .. 43 59 1 93 0 0 41 36 33 23 10 3 5 130 -21 40 46 40 42 27 19 .. .. .. 43 27 26 94 0 0 41 5 20 23 10 4 6 130 -20 40 15 36 41 55 57 39 18 57 42 55 52 95 0 0 40 34 10 23 10 4 7 131 -19 39 44 36 41 24 38 38 48 7 42 24 21 96 0 0 40 3 5 23 10 5 8 132 -18 39 13 40 40 53 23 38 17 22 41 52 54 97 0 0 39 32 6 23 10 5 9 132 -17 38 42 50 40 22 14 37 46 43 41 21 32 98 0 0 39 1 14 23 10 6 10 133 -17 38 12 8 39 51 11 37 16 11 40 50 16 99 0 0 38 30 29 23 10 6 10 134 -16 37 41 33 39 20 16 36 45 47 40 19 8 100 0 0 37 59 54 23 10 7 11 134 -15 37 11 8 38 49 30 36 15 33 39 48 9 101 0 0 37 29 28 23 10 8 12 135 -14 36 40 53 38 18 53 35 45 30 39 17 19 102 0 0 36 59 14 23 10 9 13 136 -13 36 10 50 37 48 28 35 15 38 38 46 40 103 0 0 36 29 13 23 10 10 14 136 -12 35 40 58 37 18 15 34 45 58 38 16 14 104 0 0 35 59 24 23 10 11 15 137 -11 35 11 21 36 48 15 34 16 32 37 46 0 105 0 0 35 29 50 23 10 12 16 138 -10 34 41 57 36 18 30 33 47 20 37 16 1 106 0 0 35 0 31 23 10 13 17 138 -10 34 12 49 35 49 0 33 18 24 36 46 16 107 0 0 34 31 28 23 10 14 18 139 -9 33 43 57 35 19 45 32 49 45 36 16 48 108 0 0 34 2 43 23 10 16 19 140 -8 33 15 23 34 50 49 32 21 22 35 47 37 109 0 0 33 34 16 23 10 17 20 140 -7 32 47 7 34 22 10 31 53 18 35 18 44 110 0 0 33 6 8 23 10 18 21 141 -6 32 19 9 33 53 50 31 25 33 34 50 11 111 0 0 32 38 19 23 10 20 21 142 -5 31 51 32 33 25 51 30 58 8 34 21 57 112 0 0 32 10 52 23 10 21 22 142 -4 31 24 16 32 58 12 30 31 3 33 54 5 113 0 0 31 43 46 23 10 23 23 143 -3 30 57 21 32 30 55 30 4 21 33 26 34 114 0 0 31 17 3 23 10 24 24 144 -2 30 30 49 32 4 1 29 38 0 32 59 25 115 0 0 30 50 43 23 10 26 25 144 -1 30 4 39 31 37 29 29 12 3 32 32 40 116 0 0 30 24 47 23 10 28 26 145 0 29 38 54 31 11 22 28 46 29 32 6 20 117 0 0 29 59 16 23 10 30 27 146 1 29 13 33 30 45 40 28 21 20 31 40 24 118 0 0 29 34 10 23 10 32 27 147 2 28 48 38 30 20 23 27 56 37 31 14 54 119 0 0 29 9 31 23 10 34 28 147 3 28 24 9 29 55 33 27 32 19 30 49 50 120 0 0 28 45 18 23 10 35 29 148 4 28 0 6 29 31 9 27 8 27 30 25 14 121 0 0 28 21 32 23 10 38 30 149 5 27 36 30 29 7 13 26 45 3 30 1 5 122 0 0 27 58 14 23 10 40 31 150 6 27 13 22 28 43 45 26 22 6 29 37 24 123 0 0 27 35 25 23 10 42 31 151 7 26 50 43 28 20 45 25 59 37 29 14 12 124 0 0 27 13 5 23 10 44 32 151 8 26 28 32 27 58 15 25 37 37 28 51 30 125 0 0 26 51 14 23 10 46 33 152 9 26 6 51 27 36 15 25 16 6 28 29 17 126 0 0 26 29 54 23 10 48 34 153 10 25 45 40 27 14 45 24 55 5 28 7 35 127 0 0 26 9 4 23 10 51 34 154 11 25 24 59 26 53 45 24 34 35 27 46 24 128 0 0 25 48 45 23 10 53 35 155 12 25 4 49 26 33 17 24 14 34 27 25 45 129 0 0 25 28 57 23 10 55 36 156 13 24 45 10 26 13 20 23 55 5 27 5 37 130 0 0 25 9 41 23 10 58 36 157 13 24 26 2 25 53 56 23 36 7 26 46 2 131 0 0 24 50 58 23 11 0 37 158 14 24 7 27 25 35 3 23 17 41 26 27 0 132 0 0 24 32 47 23 11 3 38 159 15 23 49 24 25 16 44 22 59 47 26 8 30 133 0 0 24 15 8 23 11 5 38 160 16 23 31 54 24 58 58 22 42 25 25 50 34 134 0 0 23 58 3 23 11 8 39 161 17 23 14 56 24 41 45 22 25 36 25 33 11 135 0 0 23 41 32 23 11 10 39 162 18 22 58 32 24 25 6 22 9 20 25 16 23 136 0 0 23 25 34 23 11 13 40 163 19 22 42 42 24 9 1 21 53 37 25 0 9 137 0 0 23 10 11 23 11 16 40 164 20 22 27 25 23 53 30 21 38 28 24 44 30 138 0 0 22 55 22 23 11 18 41 165 21 22 12 42 23 38 34 21 23 53 24 29 25 139 0 0 22 41 7 23 11 21 41 166 22 21 58 34 23 24 13 21 9 52 24 14 56 140 0 0 22 27 27 23 11 24 42 167 23 21 45 0 23 10 27 20 56 25 24 1 2 141 0 0 22 14 22 23 11 26 42 169 24 21 32 2 22 57 16 20 43 33 23 47 44 142 0 0 22 1 53 23 11 29 43 170 25 21 19 37 22 44 40 20 31 15 23 35 1 143 0 0 21 49 58 23 11 32 43 171 26 21 7 49 22 32 40 20 19 32 23 22 55 144 0 0 21 38 40 23 11 35 43 172 26 20 56 35 22 21 16 20 8 24 23 11 24 145 0 0 21 27 57 23 11 38 44 173 27 20 45 57 22 10 28 19 57 51 23 0 30 146 0 0 21 17 50 23 11 40 44 175 28 20 35 54 22 0 16 19 47 54 22 50 13 147 0 0 21 8 18 23 11 43 44 176 29 20 26 27 21 50 41 19 38 32 22 40 31 148 0 0 20 59 23 23 11 46 44 177 30 20 17 36 21 41 41 19 29 45 22 31 27 149 0 0 20 51 4 23 11 49 44 178 31 20 9 21 21 33 19 19 21 34 22 23 0 150 0 0 20 43 22 23 11 52 45 180 32 20 1 42 21 25 32 19 13 59 22 15 9 151 0 0 20 36 15 23 11 55 45 181 32 19 54 39 21 18 23 19 7 0 22 7 55 152 0 0 20 29 46 23 11 57 45 182 33 19 48 12 21 11 50 19 0 36 22 1 19 153 0 0 20 23 52 23 12 0 45 184 34 19 42 22 21 5 54 18 54 49 21 55 19 154 0 0 20 18 36 23 12 3 45 185 35 19 37 7 21 0 35 18 49 37 21 49 57 155 0 0 20 13 56 23 12 6 45 186 36 19 32 30 20 55 53 18 45 2 21 45 12 156 0 0 20 9 53 23 12 9 45 188 36 19 28 28 20 51 47 18 41 2 21 41 5 157 0 0 20 6 26 23 12 12 45 189 37 19 25 3 20 48 19 18 37 39 21 37 35 158 0 0 20 3 36 23 12 15 45 190 38 19 22 15 20 45 28 18 34 53 21 34 42 159 0 0 20 1 24 23 12 17 44 191 39 19 20 3 20 43 14 18 32 42 21 32 27 160 0 0 19 59 48 23 12 20 44 193 39 19 18 28 20 41 38 18 31 7 21 30 49 161 0 0 19 58 48 23 12 23 44 194 40 19 17 29 20 40 38 18 30 9 21 29 49 162 0 0 19 58 26 23 12 26 44 195 41 19 17 7 20 40 15 18 29 47 21 29 26 163 0 0 19 58 41 23 12 29 44 196 41 19 17 22 20 40 30 18 30 2 21 29 41 164 0 0 19 59 32 23 12 31 43 198 42 19 18 13 20 41 22 18 30 52 21 30 33 165 0 0 20 1 0 23 12 34 43 199 43 19 19 40 20 42 50 18 32 19 21 32 2 166 0 0 20 3 5 23 12 37 43 200 43 19 21 44 20 44 56 18 34 22 21 34 9 167 0 0 20 5 47 23 12 40 42 201 44 19 24 25 20 47 39 18 37 2 21 36 54 168 0 0 20 9 6 23 12 42 42 202 44 19 27 42 20 50 59 18 40 17 21 40 16 169 0 0 20 13 1 23 12 45 41 203 45 19 31 35 20 54 56 18 44 9 21 44 15 170 0 0 20 17 33 23 12 48 41 204 45 19 36 5 20 59 30 18 48 36 21 48 51 171 0 0 20 22 41 23 12 50 41 205 46 19 41 12 21 4 41 18 53 40 21 54 5 172 0 0 20 28 26 23 12 53 40 206 46 19 46 54 21 10 29 18 59 20 21 59 56 173 0 0 20 34 48 23 12 55 39 207 47 19 53 13 21 16 53 19 5 35 22 6 24 174 0 0 20 41 45 23 12 58 39 208 47 20 0 7 21 23 54 19 12 26 22 13 29 175 0 0 20 49 19 23 13 1 38 209 47 20 7 38 21 31 32 19 19 53 22 21 10 176 0 0 20 57 30 23 13 3 38 210 48 20 15 45 21 39 46 19 27 56 22 29 29 177 0 0 21 6 16 23 13 6 37 211 48 20 24 27 21 48 36 19 36 34 22 38 24 178 0 0 21 15 38 23 13 8 37 212 48 20 33 45 21 58 3 19 45 48 22 47 56 179 0 0 21 25 36 23 13 10 36 213 48 20 43 39 22 8 5 19 55 36 22 58 4 180 0 0 21 36 10 23 13 13 35 214 49 20 54 8 22 18 44 20 6 0 23 8 49 -179 0 0 21 47 19 23 13 15 35 215 49 21 5 12 22 29 58 20 16 59 23 20 9 -178 0 0 21 59 4 23 13 17 34 216 49 21 16 52 22 41 48 20 28 33 23 32 6 -177 0 0 22 11 24 23 13 20 33 216 49 21 29 6 22 54 14 20 40 41 23 44 38 -176 0 0 22 24 19 23 13 22 32 217 49 21 41 55 23 7 15 20 53 24 23 57 46 -175 0 0 22 37 48 23 13 24 32 218 49 21 55 19 23 20 51 21 6 41 24 11 30 -174 0 0 22 51 53 23 13 26 31 219 49 22 9 17 23 35 1 21 20 32 24 25 48 -173 0 0 23 6 31 23 13 28 30 219 49 22 23 49 23 49 47 21 34 57 24 40 42 -172 0 0 23 21 44 23 13 30 29 220 49 22 38 55 24 5 7 21 49 55 24 56 10 -171 0 0 23 37 31 23 13 32 29 221 49 22 54 35 24 21 0 22 5 27 25 12 13 -170 0 0 23 53 51 23 13 34 28 222 49 23 10 48 24 37 28 22 21 33 25 28 49 -169 0 0 24 10 45 23 13 36 27 222 49 23 27 34 24 54 29 22 38 11 25 46 0 -168 0 0 24 28 11 23 13 38 26 223 48 23 44 53 25 12 4 22 55 21 26 3 44 -167 0 0 24 46 11 23 13 40 25 223 48 24 2 45 25 30 12 23 13 4 26 22 2 -166 0 0 25 4 42 23 13 41 24 224 48 24 21 8 25 48 52 23 31 18 26 40 52 -165 0 0 25 23 46 23 13 43 24 225 48 24 40 4 26 8 4 23 50 5 27 0 15 -164 0 0 25 43 21 23 13 45 23 225 47 24 59 31 26 27 48 24 9 22 27 20 10 -163 0 0 26 3 28 23 13 46 22 226 47 25 19 28 26 48 4 24 29 10 27 40 36 -162 0 0 26 24 5 23 13 48 21 227 47 25 39 57 27 8 50 24 49 29 28 1 34 -161 0 0 26 45 13 23 13 49 20 227 46 26 0 55 27 30 7 25 10 17 28 23 3 -160 0 0 27 6 50 23 13 50 19 228 46 26 22 24 27 51 55 25 31 35 28 45 2 -159 0 0 27 28 57 23 13 52 18 228 45 26 44 21 28 14 11 25 53 22 29 7 30 -158 0 0 27 51 33 23 13 53 17 229 45 27 6 47 28 36 57 26 15 38 29 30 28 -157 0 0 28 14 37 23 13 54 16 229 44 27 29 42 29 0 12 26 38 21 29 53 55 -156 0 0 28 38 9 23 13 55 15 230 44 27 53 4 29 23 54 27 1 32 30 17 50 -155 0 0 29 2 9 23 13 56 14 230 43 28 16 53 29 48 4 27 25 11 30 42 13 -154 0 0 29 26 34 23 13 57 14 231 42 28 41 9 30 12 40 27 49 15 31 7 2 -153 0 0 29 51 26 23 13 58 13 232 42 29 5 51 30 37 43 28 13 45 31 32 18 -152 0 0 30 16 44 23 13 59 12 232 41 29 30 57 31 3 11 28 38 40 31 58 0 -151 0 0 30 42 25 23 14 0 11 233 40 29 56 29 31 29 4 29 4 0 32 24 6 -150 0 0 31 8 31 23 14 1 10 233 40 30 22 24 31 55 21 29 29 44 32 50 36 -149 0 0 31 35 0 23 14 1 9 234 39 30 48 42 32 22 1 29 55 50 33 17 30 -148 0 0 32 1 52 23 14 2 8 234 38 31 15 23 32 49 4 30 22 19 33 44 47 -147 0 0 32 29 5 23 14 2 7 235 38 31 42 26 33 16 29 30 49 10 34 12 25 -146 0 0 32 56 39 23 14 3 6 235 37 32 9 49 33 44 14 .. .. .. 34 40 25 -145 0 0 33 24 33 23 14 3 5 236 36 32 37 32 34 12 19 .. .. .. 35 8 44 -144 0 0 33 52 47 23 14 3 4 237 35 33 5 34 34 40 44 .. .. .. 35 37 23 -143 0 0 34 21 18 23 14 4 3 237 35 33 33 55 35 9 27 .. .. .. 36 6 20 -142 0 0 34 50 7 23 14 4 2 238 34 34 2 33 35 38 28 .. .. .. 36 35 34 -141 0 0 35 19 13 23 14 4 1 238 33 .. .. .. 36 7 44 .. .. .. 37 5 5 -140 0 0 35 48 34 23 14 4 0 239 32 .. .. .. .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: 2UCAC 21835207 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 58 16.9404 DE: -24 46 20.662 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .023 ) * V mag [mag]: 11.1 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (23) Thalia approx. diameter [km]: 108 approx. diameter ["]: .042 distance from Earth [AU]: 3.56800 * orbital information: orbit source: Preston date of fit: 2007 Nov 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1095 number of rejected observations: 121 time covered by the observations: 1909 Mar 24 - 2007 Jul 25 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.008, 100° remarks: * orbital elements for (23) Thalia : Mean anomaly = 106.85062339 deg Arg. of pericenter = 59.51145137 deg Long. of node = 67.22836671 deg Inclination = 10.14218713 deg Eccentricity = 0.23285051 Semimajor axis = 2.62914849 AU Perihelion dist = 2.01694991 AU Mag: H = 6.99, G = 0.15 Epoch of elements : MJD 54497.96700000 TDT (2008 Feb 01.967) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 01 23 Thalia 23h 12.1m UT 11.1 17 58 16.940-24 46 20.662UCAC 21835207 0.0 12.8 108 2.9 3.568 3.781 -4.61 150.020 -24.771 195.38 -17.06 23.2009 .06384 .70537 20.89254 -1.87027 -0.00404 -0.00009 2000 105.0086792008 125.00000 59.511451 67.228367 10.1421870.232850512.629148492.016949916.955 0.15 RATE 2.3119660 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.026 0.025 91.2 1.580 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 17, 18:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org