IOTA/IOTA-ES occultation update for (76) Freia / 2UCAC 39283459 event on 2008 Mar 27, 07:57 UT Visible from Alaska, NW Canada Summary ------- On 2008 Mar 27 UT, the 184 km diameter asteroid (76) Freia will occult a 12.4 mag star in the constellation Orion for observers along a path across Alaska, NW Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 13.4 mag (the magnitude of the asteroid) for at most 9.2 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: 99 * date and approx. time of event: 2008 Mar 27, 07:57 - 2008 Mar 27, 08:00 UT * magnitude of target star: 12.4 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 9.2 * Moon: 74 % sunlit, 156° distance * Sun: 85° distance * rough path description: Alaska, NW Canada The occultation path -------------------- * approximate projected width [km]: 295 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .019", 91° ) * approx speed of asteroid's shadow [km/s]: 19.9698 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 39283459 by 76 Freia on 2008 Mar 27 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 161 0 0 72 58 31 7 57 49 38 196 0 71 39 20 74 20 6 71 6 44 74 55 8 162 0 0 72 56 49 7 57 51 38 197 0 71 37 34 74 18 28 71 4 55 74 53 33 163 0 0 72 54 56 7 57 53 38 198 -1 71 35 35 74 16 41 71 2 55 74 51 48 164 0 0 72 52 51 7 57 54 38 199 -1 71 33 25 74 14 42 71 0 42 74 49 52 165 0 0 72 50 35 7 57 56 37 200 -1 71 31 3 74 12 33 70 58 18 74 47 46 166 0 0 72 48 8 7 57 58 37 202 -1 71 28 29 74 10 13 70 55 41 74 45 29 167 0 0 72 45 29 7 57 59 37 203 -2 71 25 43 74 7 42 70 52 53 74 43 2 168 0 0 72 42 39 7 58 1 37 204 -2 71 22 45 74 5 0 70 49 52 74 40 24 169 0 0 72 39 37 7 58 3 37 205 -2 71 19 35 74 2 8 70 46 39 74 37 35 170 0 0 72 36 24 7 58 4 37 206 -3 71 16 13 73 59 3 70 43 13 74 34 35 171 0 0 72 32 59 7 58 6 37 208 -3 71 12 39 73 55 48 70 39 35 74 31 24 172 0 0 72 29 21 7 58 8 37 209 -3 71 8 52 73 52 21 70 35 45 74 28 2 173 0 0 72 25 32 7 58 9 37 210 -4 71 4 53 73 48 43 70 31 41 74 24 28 174 0 0 72 21 31 7 58 11 37 211 -4 71 0 41 73 44 53 70 27 25 74 20 44 175 0 0 72 17 17 7 58 13 37 212 -4 70 56 16 73 40 51 70 22 56 74 16 47 176 0 0 72 12 51 7 58 14 37 213 -5 70 51 39 73 36 37 70 18 14 74 12 39 177 0 0 72 8 12 7 58 16 36 215 -5 70 46 48 73 32 12 70 13 19 74 8 19 178 0 0 72 3 21 7 58 18 36 216 -5 70 41 45 73 27 34 70 8 11 74 3 47 179 0 0 71 58 17 7 58 20 36 217 -6 70 36 28 73 22 44 70 2 49 73 59 4 180 0 0 71 53 0 7 58 21 36 218 -6 70 30 57 73 17 41 69 57 13 73 54 7 -179 0 0 71 47 29 7 58 23 36 219 -6 70 25 13 73 12 26 69 51 24 73 48 59 -178 0 0 71 41 46 7 58 25 36 221 -6 70 19 16 73 6 57 69 45 21 73 43 37 -177 0 0 71 35 49 7 58 27 36 222 -7 70 13 4 73 1 16 69 39 4 73 38 3 -176 0 0 71 29 38 7 58 28 36 223 -7 70 6 39 72 55 22 69 32 32 73 32 16 -175 0 0 71 23 13 7 58 30 35 224 -7 69 59 59 72 49 14 69 25 47 73 26 16 -174 0 0 71 16 35 7 58 32 35 225 -8 69 53 5 72 42 53 69 18 46 73 20 2 -173 0 0 71 9 42 7 58 34 35 226 -8 69 45 56 72 36 17 69 11 31 73 13 35 -172 0 0 71 2 35 7 58 36 35 228 -8 69 38 33 72 29 28 69 4 1 73 6 54 -171 0 0 70 55 13 7 58 37 35 229 -9 69 30 54 72 22 25 68 56 16 72 59 59 -170 0 0 70 47 36 7 58 39 35 230 -9 69 23 0 72 15 7 68 48 16 72 52 50 -169 0 0 70 39 45 7 58 41 34 231 -9 69 14 52 72 7 35 68 40 0 72 45 26 -168 0 0 70 31 38 7 58 43 34 232 -10 69 6 27 71 59 47 68 31 29 72 37 48 -167 0 0 70 23 16 7 58 45 34 233 -10 68 57 47 71 51 45 68 22 41 72 29 54 -166 0 0 70 14 38 7 58 47 34 235 -11 68 48 51 71 43 27 68 13 38 72 21 46 -165 0 0 70 5 44 7 58 48 34 236 -11 68 39 38 71 34 54 68 4 19 72 13 22 -164 0 0 69 56 35 7 58 50 33 237 -11 68 30 10 71 26 5 67 54 43 72 4 42 -163 0 0 69 47 8 7 58 52 33 238 -12 68 20 25 71 17 0 67 44 50 71 55 47 -162 0 0 69 37 26 7 58 54 33 239 -12 68 10 23 71 7 39 67 34 41 71 46 35 -161 0 0 69 27 26 7 58 56 33 240 -12 68 0 4 70 58 1 67 24 14 71 37 7 -160 0 0 69 17 10 7 58 58 33 242 -13 67 49 28 70 48 6 67 13 31 71 27 22 -159 0 0 69 6 36 7 59 0 32 243 -13 67 38 35 70 37 55 67 2 29 71 17 21 -158 0 0 68 55 45 7 59 2 32 244 -13 67 27 24 70 27 26 66 51 11 71 7 2 -157 0 0 68 44 36 7 59 4 32 245 -14 67 15 55 70 16 39 66 39 34 70 56 25 -156 0 0 68 33 10 7 59 6 32 246 -14 67 4 8 70 5 35 66 27 40 70 45 31 -155 0 0 68 21 25 7 59 8 31 247 -15 66 52 4 69 54 12 66 15 27 70 34 19 -154 0 0 68 9 22 7 59 10 31 248 -15 66 39 40 69 42 32 66 2 56 70 22 49 -153 0 0 67 57 0 7 59 12 31 250 -15 66 26 59 69 30 33 65 50 7 70 11 0 -152 0 0 67 44 20 7 59 14 31 251 -16 66 13 58 69 18 15 65 36 58 69 58 53 -151 0 0 67 31 21 7 59 16 30 252 -16 66 0 39 69 5 38 65 23 31 69 46 26 -150 0 0 67 18 2 7 59 18 30 253 -17 65 47 1 68 52 42 65 9 45 69 33 40 -149 0 0 67 4 25 7 59 20 30 254 -17 65 33 3 68 39 26 64 55 40 69 20 35 -148 0 0 66 50 27 7 59 22 29 255 -17 65 18 46 68 25 51 64 41 15 69 7 10 -147 0 0 66 36 10 7 59 24 29 256 -18 65 4 10 68 11 56 64 26 31 68 53 25 -146 0 0 66 21 34 7 59 26 29 257 -18 64 49 14 67 57 41 64 11 28 68 39 20 -145 0 0 66 6 37 7 59 28 28 258 -19 64 33 58 67 43 6 63 56 5 68 24 54 -144 0 0 65 51 20 7 59 30 28 260 -19 64 18 23 67 28 10 63 40 22 68 10 8 -143 0 0 65 35 43 7 59 32 28 261 -19 64 2 27 67 12 54 63 24 19 67 55 1 -142 0 0 65 19 46 7 59 34 27 262 -20 63 46 12 66 57 17 63 7 57 67 39 34 -141 0 0 65 3 28 7 59 36 27 263 -20 63 29 36 66 41 19 62 51 15 67 23 45 -140 0 0 64 46 50 7 59 38 26 264 -21 63 12 41 66 25 0 62 34 13 67 7 35 -139 0 0 64 29 51 7 59 40 26 265 -21 62 55 25 66 8 20 62 16 51 66 51 4 -138 0 0 64 12 31 7 59 43 26 266 -22 62 37 50 65 51 19 61 59 9 66 34 11 -137 0 0 63 54 51 7 59 45 25 267 -22 62 19 54 65 33 57 61 41 7 66 16 58 -136 0 0 63 36 51 7 59 47 25 268 -22 62 1 38 65 16 14 61 22 46 65 59 22 -135 0 0 63 18 30 7 59 49 24 269 -23 61 43 3 64 58 9 61 4 4 65 41 25 -134 0 0 62 59 49 7 59 51 24 270 -23 61 24 8 64 39 44 60 45 4 65 23 7 -133 0 0 62 40 47 7 59 53 23 271 -24 61 4 53 64 20 57 60 25 44 65 4 28 -132 0 0 62 21 25 7 59 55 23 272 -24 60 45 18 64 1 49 60 6 5 64 45 27 -131 0 0 62 1 43 7 59 57 22 273 -25 60 25 24 63 42 21 59 46 6 64 26 4 -130 0 0 61 41 41 7 59 59 22 274 -25 60 5 12 63 22 32 59 25 49 64 6 21 -129 0 0 61 21 20 8 0 1 21 275 -25 59 44 40 63 2 22 59 5 13 63 46 17 -128 0 0 61 0 39 8 0 3 21 276 -26 59 23 49 62 41 52 58 44 19 63 25 51 -127 0 0 60 39 38 8 0 5 20 277 -26 59 2 41 62 21 1 58 23 7 63 5 6 -126 0 0 60 18 19 8 0 7 20 278 -27 58 41 14 61 59 51 58 1 37 62 44 0 -125 0 0 59 56 42 8 0 8 19 279 -27 58 19 29 61 38 22 57 39 50 62 22 34 -124 0 0 59 34 46 8 0 10 19 280 -28 57 57 28 61 16 33 57 17 46 62 0 48 -123 0 0 59 12 33 8 0 12 18 281 -28 57 35 9 60 54 25 56 55 26 61 38 43 -122 0 0 58 50 2 8 0 14 18 282 -28 57 12 34 60 31 59 56 32 49 61 16 19 -121 0 0 58 27 14 8 0 16 17 283 -29 56 49 43 60 9 15 56 9 57 60 53 37 -120 0 0 58 4 10 8 0 17 16 284 -29 56 26 37 59 46 14 55 46 50 60 30 37 -119 0 0 57 40 50 8 0 19 16 285 -30 56 3 15 59 22 55 55 23 28 60 7 20 -118 0 0 57 17 15 8 0 21 15 286 -30 55 39 40 58 59 21 54 59 52 59 43 45 -117 0 0 56 53 25 8 0 22 14 287 -30 55 15 51 58 35 30 54 36 3 59 19 54 -116 0 0 56 29 21 8 0 24 14 288 -31 54 51 48 58 11 25 54 12 1 58 55 48 -115 0 0 56 5 4 8 0 25 13 288 -31 54 27 33 57 47 5 53 47 47 58 31 27 -114 0 0 55 40 34 8 0 27 13 289 -32 54 3 7 57 22 31 53 23 22 58 6 51 -113 0 0 55 15 52 8 0 28 12 290 -32 53 38 29 56 57 44 52 58 46 57 42 2 -112 0 0 54 50 59 8 0 29 11 291 -32 53 13 41 56 32 45 52 34 0 57 17 0 -111 0 0 54 25 55 8 0 30 10 292 -33 52 48 43 56 7 34 52 9 4 56 51 46 -110 0 0 54 0 41 8 0 32 10 293 -33 52 23 36 55 42 13 51 44 0 56 26 21 -109 0 0 53 35 19 8 0 33 9 294 -33 51 58 22 55 16 41 51 18 49 56 0 45 -108 0 0 53 9 48 8 0 34 8 294 -33 51 33 0 54 51 1 50 53 30 55 35 0 -107 0 0 52 44 10 8 0 35 8 295 -34 51 7 31 54 25 12 50 28 5 55 9 7 -106 0 0 52 18 26 8 0 35 7 296 -34 50 41 57 53 59 16 50 2 35 54 43 5 -105 0 0 51 52 36 8 0 36 6 297 -34 50 16 19 53 33 13 49 37 1 54 16 57 -104 0 0 51 26 42 8 0 37 5 298 -34 49 50 36 53 7 6 49 11 23 53 50 43 -103 0 0 51 0 43 8 0 38 5 298 -35 49 24 50 52 40 53 48 45 42 53 24 24 -102 0 0 50 34 42 8 0 38 4 299 -35 48 59 2 52 14 37 48 19 59 52 58 1 -101 0 0 50 8 39 8 0 38 3 300 -35 48 33 13 51 48 18 47 54 15 52 31 35 -100 0 0 49 42 35 8 0 39 2 301 -35 48 7 23 51 21 58 47 28 31 52 5 7 - 99 0 0 49 16 31 8 0 39 2 301 -35 47 41 34 50 55 37 47 2 48 51 38 38 - 98 0 0 48 50 28 8 0 39 1 302 -35 .. .. .. 50 29 16 .. .. .. 51 12 8 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 12.0] Data for the target star ------------------------ * name: 2UCAC 39283459 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 09 06.3210 DE: +21 14 07.409 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .017 ) * V mag [mag]: 12.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia approx. diameter [km]: 184 approx. diameter ["]: .091 distance from Earth [AU]: 2.77800 * orbital information: orbit source: Preston date of fit: 2008 Mar 12 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1099 number of rejected observations: 179 time covered by the observations: 1911 Jul 21 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 93° remarks: * orbital elements for (76) Freia : Mean anomaly = 9.89580203 deg Arg. of pericenter = 253.96850652 deg Long. of node = 204.52686973 deg Inclination = 2.11592883 deg Eccentricity = 0.16312499 Semimajor axis = 3.41839560 AU Perihelion dist = 2.86076986 AU Mag: H = 7.86, G = 0.15 Epoch of elements : MJD 54552.33200000 TDT (2008 Mar 27.332) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 27 76 Freia 7h 57.4m UT 12.4 6 9 6.321 21 14 7.412UCAC 39283459 0.0 13.4 184 9.2 2.778 2.552 0.97 147.8142 21.236 61.99 2.79 7.9559 -0.02146 0.78203 11.26736 0.30685 0.00576 -0.00011 2000 9.5321392008 325.00000253.968507204.526870 2.1159290.16312499 3.4183956 2.8607699 7.9 5.00.15 RATE 1.5594470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.019 91 1.21 0.019 0 54537.5020080327_283459 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 12, 23:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org