IOTA/IOTA-ES occultation update for (182) Elsa / UCAC2 39092998 event on 2009 Feb 11, 08:26 UT Visible from Summary ------- On 2009 Feb 11 UT, the 44 km diameter asteroid (182) Elsa will occult a 11.9 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.9 mag (the magnitude of the asteroid) for at most 3.2 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: 47 * date and approx. time of event: 2009 Feb 11, 08:24 - 2009 Feb 11, 08:32 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 3.2 * Moon: 96 % sunlit, 101° distance * Sun: 103° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 1.37 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .053", 88° ) * approx speed of asteroid's shadow [km/s]: 13.8702 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39092998 by 182 Elsa on 2009 Feb 11 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 135 0 0 41 26 33 8 24 40 63 133 0 41 12 14 41 40 55 40 33 8 42 20 23 136 0 0 41 45 56 8 24 47 63 135 -1 41 31 38 42 0 15 40 52 38 42 39 38 137 0 0 42 4 55 8 24 53 63 138 -2 41 50 40 42 19 12 41 11 45 42 58 30 138 0 0 42 23 32 8 25 0 64 140 -3 42 9 19 42 37 48 41 30 30 43 16 59 139 0 0 42 41 47 8 25 6 64 142 -3 42 27 36 42 56 0 41 48 52 43 35 6 140 0 0 42 59 39 8 25 13 64 144 -4 42 45 30 43 13 50 42 6 52 43 52 51 141 0 0 43 17 8 8 25 19 64 147 -5 43 3 1 43 31 17 42 24 28 44 10 12 142 0 0 43 34 15 8 25 25 64 149 -6 43 20 10 43 48 22 42 41 43 44 27 11 143 0 0 43 50 59 8 25 32 64 151 -7 43 36 56 44 5 3 42 58 34 44 43 47 144 0 0 44 7 20 8 25 38 65 154 -7 43 53 19 44 21 23 43 15 3 45 0 0 145 0 0 44 23 18 8 25 44 65 156 -8 44 9 19 44 37 19 43 31 9 45 15 51 146 0 0 44 38 54 8 25 51 65 159 -9 44 24 57 44 52 53 43 46 52 45 31 20 147 0 0 44 54 7 8 25 57 65 161 -10 44 40 12 45 8 4 44 2 12 45 46 25 148 0 0 45 8 58 8 26 3 65 163 -10 44 55 5 45 22 53 44 17 10 46 1 8 149 0 0 45 23 26 8 26 9 65 166 -11 45 9 35 45 37 19 44 31 46 46 15 29 150 0 0 45 37 32 8 26 15 65 168 -12 45 23 42 45 51 22 44 45 58 46 29 27 151 0 0 45 51 15 8 26 21 64 170 -13 45 37 27 46 5 4 44 59 49 46 43 3 152 0 0 46 4 36 8 26 27 64 173 -13 45 50 50 46 18 23 45 13 16 46 56 17 153 0 0 46 17 34 8 26 33 64 175 -14 46 3 51 46 31 19 45 26 22 47 9 9 154 0 0 46 30 11 8 26 39 64 177 -15 46 16 29 46 43 54 45 39 5 47 21 38 155 0 0 46 42 25 8 26 45 64 179 -16 46 28 45 46 56 7 45 51 26 47 33 46 156 0 0 46 54 17 8 26 51 64 181 -16 46 40 39 47 7 57 46 3 25 47 45 32 157 0 0 47 5 48 8 26 56 63 184 -17 46 52 11 47 19 26 46 15 2 47 56 56 158 0 0 47 16 57 8 27 2 63 186 -18 47 3 22 47 30 33 46 26 17 48 7 58 159 0 0 47 27 44 8 27 8 63 188 -18 47 14 10 47 41 18 46 37 10 48 18 39 160 0 0 47 38 9 8 27 13 63 190 -19 47 24 37 47 51 42 46 47 41 48 28 58 161 0 0 47 48 13 8 27 19 62 192 -20 47 34 43 48 1 45 46 57 51 48 38 56 162 0 0 47 57 55 8 27 25 62 194 -20 47 44 27 48 11 26 47 7 39 48 48 33 163 0 0 48 7 17 8 27 30 62 196 -21 47 53 49 48 20 45 47 17 5 48 57 49 164 0 0 48 16 17 8 27 36 61 198 -22 48 2 51 48 29 44 47 26 11 49 6 43 165 0 0 48 24 55 8 27 41 61 200 -22 48 11 31 48 38 21 47 34 55 49 15 17 166 0 0 48 33 13 8 27 46 61 201 -23 48 19 50 48 46 38 47 43 18 49 23 30 167 0 0 48 41 10 8 27 52 60 203 -24 48 27 49 48 54 34 47 51 19 49 31 22 168 0 0 48 48 47 8 27 57 60 205 -24 48 35 26 49 2 8 47 59 0 49 38 53 169 0 0 48 56 2 8 28 2 60 207 -25 48 42 43 49 9 23 48 6 20 49 46 4 170 0 0 49 2 57 8 28 7 59 208 -26 48 49 39 49 16 17 48 13 19 49 52 55 171 0 0 49 9 31 8 28 13 59 210 -26 48 56 14 49 22 50 48 19 57 49 59 25 172 0 0 49 15 45 8 28 18 58 212 -27 49 2 29 49 29 3 48 26 15 50 5 35 173 0 0 49 21 39 8 28 23 58 213 -28 49 8 24 49 34 55 48 32 12 50 11 25 174 0 0 49 27 12 8 28 28 57 215 -28 49 13 58 49 40 28 48 37 49 50 16 55 175 0 0 49 32 25 8 28 33 57 216 -29 49 19 12 49 45 40 48 43 5 50 22 5 176 0 0 49 37 18 8 28 38 56 218 -30 49 24 6 49 50 32 48 48 1 50 26 55 177 0 0 49 41 51 8 28 43 56 219 -30 49 28 39 49 55 4 48 52 37 50 31 25 178 0 0 49 46 4 8 28 48 55 221 -31 49 32 53 49 59 16 48 56 53 50 35 35 179 0 0 49 49 57 8 28 52 55 222 -31 49 36 47 50 3 9 49 0 48 50 39 26 180 0 0 49 53 30 8 28 57 55 224 -32 49 40 20 50 6 41 49 4 23 50 42 57 -179 0 0 49 56 44 8 29 2 54 225 -33 49 43 34 50 9 54 49 7 39 50 46 8 -178 0 0 49 59 37 8 29 7 54 226 -33 49 46 28 50 12 47 49 10 34 50 49 0 -177 0 0 50 2 11 8 29 11 53 228 -34 49 49 3 50 15 21 49 13 10 50 51 32 -176 0 0 50 4 26 8 29 16 53 229 -34 49 51 18 50 17 35 49 15 26 50 53 45 -175 0 0 50 6 20 8 29 21 52 230 -35 49 53 13 50 19 29 49 17 21 50 55 39 -174 0 0 50 7 55 8 29 25 51 232 -36 49 54 48 50 21 4 49 18 57 50 57 13 -173 0 0 50 9 11 8 29 30 51 233 -36 49 56 4 50 22 20 49 20 14 50 58 28 -172 0 0 50 10 7 8 29 34 50 234 -37 49 57 0 50 23 16 49 21 10 50 59 24 -171 0 0 50 10 44 8 29 39 50 235 -37 49 57 37 50 23 52 49 21 47 51 0 0 -170 0 0 50 11 1 8 29 43 49 237 -38 49 57 54 50 24 9 49 22 5 51 0 17 -169 0 0 50 10 59 8 29 47 49 238 -39 49 57 52 50 24 7 49 22 2 51 0 15 -168 0 0 50 10 37 8 29 52 48 239 -39 49 57 30 50 23 45 49 21 40 50 59 53 -167 0 0 50 9 56 8 29 56 48 240 -40 49 56 48 50 23 4 49 20 58 50 59 13 -166 0 0 50 8 55 8 30 0 47 241 -40 49 55 47 50 22 4 49 19 57 50 58 13 -165 0 0 50 7 35 8 30 5 47 242 -41 49 54 27 50 20 44 49 18 36 50 56 54 -164 0 0 50 5 55 8 30 9 46 244 -41 49 52 47 50 19 5 49 16 55 50 55 15 -163 0 0 50 3 56 8 30 13 45 245 -42 49 50 48 50 17 6 49 14 54 50 53 18 -162 0 0 50 1 38 8 30 17 45 246 -43 49 48 29 50 14 48 49 12 34 50 51 1 -161 0 0 49 59 0 8 30 21 44 247 -43 49 45 50 50 12 10 49 9 54 50 48 25 -160 0 0 49 56 2 8 30 25 44 248 -44 49 42 52 50 9 13 49 6 54 50 45 29 -159 0 0 49 52 45 8 30 29 43 249 -44 49 39 34 50 5 57 49 3 35 50 42 14 -158 0 0 49 49 8 8 30 33 42 250 -45 49 35 57 50 2 21 48 59 56 50 38 40 -157 0 0 49 45 11 8 30 37 42 251 -45 49 31 59 49 58 25 48 55 57 50 34 46 -156 0 0 49 40 55 8 30 41 41 252 -46 49 27 43 49 54 9 48 51 38 50 30 33 -155 0 0 49 36 19 8 30 45 41 253 -46 49 23 6 49 49 34 48 46 59 50 26 0 -154 0 0 49 31 24 8 30 49 40 254 -47 49 18 9 49 44 40 48 42 0 50 21 8 -153 0 0 49 26 8 8 30 53 39 255 -47 49 12 53 49 39 25 48 36 41 50 15 56 -152 0 0 49 20 33 8 30 56 39 256 -48 49 7 16 49 33 51 48 31 2 50 10 24 -151 0 0 49 14 37 8 31 0 38 257 -48 49 1 20 49 27 56 48 25 3 50 4 33 -150 0 0 49 8 22 8 31 4 38 258 -49 48 55 4 49 21 42 48 18 43 49 58 21 -149 0 0 49 1 47 8 31 7 37 259 -49 48 48 27 49 15 8 48 12 4 49 51 50 -148 0 0 48 54 51 8 31 11 36 260 -50 48 41 30 49 8 13 48 5 4 49 44 59 -147 0 0 48 47 35 8 31 15 36 261 -50 48 34 13 49 0 59 47 57 43 49 37 48 -146 0 0 48 39 59 8 31 18 35 262 -51 48 26 36 48 53 24 47 50 3 49 30 16 -145 0 0 48 32 3 8 31 22 34 263 -51 48 18 38 48 45 29 47 42 1 49 22 25 -144 0 0 48 23 46 8 31 25 34 263 -52 48 10 20 48 37 13 47 33 39 49 14 13 -143 0 0 48 15 9 8 31 28 33 264 -52 48 1 41 48 28 37 47 24 57 49 5 41 -142 0 0 48 6 11 8 31 32 32 265 -53 47 52 42 48 19 41 47 15 54 48 56 49 -141 0 0 47 56 52 8 31 35 32 266 -53 47 43 22 48 10 24 47 6 30 48 47 36 -140 0 0 47 47 13 8 31 38 31 267 -54 47 33 41 48 0 46 46 56 45 48 38 2 -139 0 0 47 37 13 8 31 41 30 268 -54 47 23 40 47 50 48 46 46 39 48 28 8 -138 0 0 47 26 52 8 31 45 30 269 -55 47 13 17 47 40 29 46 36 12 48 17 54 -137 0 0 47 16 10 8 31 48 29 270 -55 47 2 34 47 29 48 46 25 24 48 7 18 -136 0 0 47 5 8 8 31 51 28 270 -55 46 51 29 47 18 47 46 14 16 47 56 21 -135 0 0 46 53 44 8 31 54 28 271 -56 46 40 4 47 7 25 46 2 45 47 45 4 -134 0 0 46 41 59 8 31 57 27 272 -56 46 28 17 46 55 42 45 50 54 47 33 25 -133 0 0 46 29 53 8 32 0 26 273 -57 46 16 9 46 43 37 45 38 41 47 21 26 -132 0 0 46 17 25 8 32 2 26 274 -57 46 3 40 46 31 12 45 26 8 47 9 5 -131 0 0 46 4 37 8 32 5 25 274 -57 45 50 50 46 18 25 45 13 12 46 56 23 -130 0 0 45 51 26 8 32 8 24 275 -58 45 37 38 46 5 17 44 59 55 46 43 20 -129 0 0 45 37 55 8 32 11 23 276 -58 45 24 5 45 51 47 44 46 17 46 29 56 -128 0 0 45 24 2 8 32 13 23 277 -58 45 10 10 45 37 56 44 32 17 46 16 10 -127 0 0 45 9 48 8 32 16 22 278 -59 44 55 54 45 23 44 44 17 56 46 2 3 -126 0 0 44 55 12 8 32 18 21 278 -59 44 41 16 45 9 10 44 3 13 45 47 34 -125 0 0 44 40 15 8 32 21 20 279 -59 44 26 17 44 54 14 43 48 9 45 32 44 -124 0 0 44 24 56 8 32 23 20 280 -60 44 10 56 44 38 58 43 32 43 45 17 32 -123 0 0 44 9 16 8 32 25 19 281 -60 43 55 14 44 23 19 43 16 56 45 1 59 -122 0 0 43 53 14 8 32 27 18 281 -60 43 39 10 44 7 19 43 0 47 44 46 5 -121 0 0 43 36 50 8 32 29 17 282 -60 43 22 45 43 50 58 42 44 16 44 29 49 -120 0 0 43 20 6 8 32 32 17 283 -60 43 5 58 43 34 15 42 27 25 44 13 11 -119 0 0 43 2 59 8 32 33 16 284 -61 42 48 50 43 17 11 42 10 11 43 56 12 -118 0 0 42 45 32 8 32 35 15 284 -61 42 31 20 42 59 45 41 52 37 43 38 52 -117 0 0 42 27 43 8 32 37 14 285 -61 42 13 30 42 41 58 41 34 41 43 21 10 -116 0 0 42 9 33 8 32 39 13 286 -61 41 55 18 42 23 50 41 16 24 43 3 7 -115 0 0 41 51 2 8 32 41 13 286 -61 41 36 45 42 5 20 40 57 45 42 44 43 -114 0 0 41 32 9 8 32 42 12 287 -61 41 17 50 41 46 30 40 38 46 42 25 58 -113 0 0 41 12 56 8 32 44 11 288 -61 40 58 35 41 27 19 40 19 26 42 6 51 -112 0 0 40 53 22 8 32 45 10 288 -61 40 39 0 41 7 46 39 59 46 41 47 24 -111 0 0 40 33 27 8 32 46 9 289 -61 40 19 3 40 47 54 39 39 44 41 27 37 -110 0 0 40 13 12 8 32 47 9 290 -61 39 58 46 40 27 40 39 19 23 41 7 28 -109 0 0 39 52 37 8 32 48 8 290 -61 39 38 9 40 7 7 38 58 41 40 46 59 -108 0 0 39 31 42 8 32 49 7 291 -61 39 17 12 39 46 13 38 37 39 40 26 10 -107 0 0 39 10 26 8 32 50 6 292 -60 38 55 55 39 24 59 38 16 18 40 5 1 -106 0 0 38 48 52 8 32 51 5 292 -60 38 34 19 39 3 26 37 54 37 39 43 33 -105 0 0 38 26 57 8 32 52 4 293 -60 38 12 23 38 41 34 37 32 37 39 21 44 -104 0 0 38 4 44 8 32 52 3 294 -60 37 50 8 38 19 22 37 10 18 38 59 37 -103 0 0 37 42 12 8 32 53 3 294 -59 37 27 35 37 56 51 .. .. .. 38 37 11 -102 0 0 37 19 21 8 32 53 2 295 -59 37 4 43 37 34 2 .. .. .. 38 14 26 -101 0 0 36 56 13 8 32 53 1 295 -59 36 41 33 37 10 55 .. .. .. 37 51 22 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 39092998 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 13 38.7682 DE: +20 34 05.143 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .060, .051 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (182) Elsa approx. diameter [km]: 44 approx. diameter ["]: .039 distance from Earth [AU]: 1.57000 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 766 number of rejected observations: 130 time covered by the observations: 1908 Feb 11 - 2008 Oct 12 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.014, 78° remarks: * orbital elements for (182) Elsa : Mean anomaly = 24.73640935 deg Arg. of pericenter = 310.42240682 deg Long. of node = 107.25368416 deg Inclination = 2.00417040 deg Eccentricity = 0.18529528 Semimajor axis = 2.41668641 AU Perihelion dist = 1.96888582 AU Mag: H = 9.07, G = 0.15 Epoch of elements : MJD 54873.35100000 TDT (2009 Feb 11.351) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 11 182 Elsa 8h 25.9m UT 11.9 4 13 38.768 20 34 5.14UCAC2 39092998 0.0 12.9 44 3.2 1.570 3.027 10.78 155.3871 20.566 57.08 -13.93 8.4324 -0.10554 0.41058 7.58823 1.92554 0.00522 0.00096 2000 23.8572892009 2 8.00000310.422407107.253684 2.0041700.18529528 2.4166864 1.9688858 9.1 5.00.15 RATE 2.6234550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.053 88 2.37 0.053 0 54776.5020090211_092998 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org