IOTA/IOTA-ES occultation update for (757) Portlandia / TYC 1814-00959-1 event on 2007 Sep 02, 11:02 UT Visible from W Canada, NW USA Summary ------- On 2007 Sep 02 UT, the 32 km diameter asteroid (757) Portlandia will occult a 11.6 mag star in the constellation Taurus for observers along a path across W Canada, NW USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.4 mag (the magnitude of the asteroid) for at most 1.9 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: 71 * date and approx. time of event: 2007 Sep 02, 10:58 - 2007 Sep 02, 11:08 UT * midpoint of event [JD]: 2454345.960475 * magnitude of target star: 11.6 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 1.9 * Moon: 68 % sunlit, 17° distance * Sun: 95° distance * rough path description: W Canada, NW USA The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .019", 79° ) * approx speed of asteroid's shadow [km/s]: 16.8147 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1814-00959-1 by 757 Portlandia on 2007 Sep 02 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 13 21 31 10 58 6 0 66 -64 .. .. .. 13 33 42 .. .. .. 13 53 31 -178 0 0 13 48 18 10 58 6 1 66 -65 13 36 6 14 0 33 .. .. .. 14 20 28 -177 0 0 14 15 49 10 58 6 2 66 -65 14 3 32 14 28 7 .. .. .. 14 48 9 -176 0 0 14 44 1 10 58 7 3 67 -65 14 31 41 14 56 24 .. .. .. 15 16 32 -175 0 0 15 12 56 10 58 7 4 67 -65 15 0 32 15 25 23 .. .. .. 15 45 37 -174 0 0 15 42 33 10 58 8 5 67 -65 15 30 5 15 55 3 15 9 58 16 15 25 -173 0 0 16 12 51 10 58 9 6 67 -64 16 0 19 16 25 26 15 40 5 16 45 54 -172 0 0 16 43 51 10 58 10 8 68 -64 16 31 14 16 56 30 16 10 54 17 17 5 -171 0 0 17 15 31 10 58 12 9 68 -64 17 2 50 17 28 15 16 42 23 17 48 57 -170 0 0 17 47 52 10 58 13 10 68 -64 17 35 7 18 0 40 17 14 33 18 21 29 -169 0 0 18 20 53 10 58 15 11 69 -63 18 8 3 18 33 45 17 47 22 18 54 42 -168 0 0 18 54 32 10 58 17 12 69 -63 18 41 38 19 7 29 18 20 50 19 28 33 -167 0 0 19 28 51 10 58 19 13 69 -63 19 15 52 19 41 52 18 54 56 20 3 4 -166 0 0 20 3 47 10 58 21 14 70 -62 19 50 44 20 16 53 19 29 41 20 38 13 -165 0 0 20 39 21 10 58 23 15 70 -61 20 26 13 20 52 32 20 5 2 21 13 59 -164 0 0 21 15 31 10 58 26 16 71 -61 21 2 18 21 28 46 20 41 0 21 50 21 -163 0 0 21 52 16 10 58 28 17 71 -60 21 38 59 22 5 36 21 17 33 22 27 19 -162 0 0 22 29 36 10 58 31 18 72 -60 22 16 14 22 43 1 21 54 40 23 4 52 -161 0 0 23 7 30 10 58 34 20 72 -59 22 54 3 23 21 0 22 32 21 23 42 59 -160 0 0 23 45 56 10 58 38 21 73 -58 23 32 24 23 59 31 23 10 35 24 21 38 -159 0 0 24 24 53 10 58 41 22 73 -57 24 11 16 24 38 33 23 49 20 25 0 49 -158 0 0 25 4 21 10 58 45 23 74 -56 24 50 39 25 18 6 24 28 35 25 40 29 -157 0 0 25 44 18 10 58 49 24 74 -56 25 30 31 25 58 7 25 8 19 26 20 39 -156 0 0 26 24 42 10 58 53 25 75 -55 26 10 50 26 38 37 25 48 30 27 1 16 -155 0 0 27 5 32 10 58 57 26 76 -54 26 51 36 27 19 32 26 29 8 27 42 19 -154 0 0 27 46 47 10 59 1 27 76 -53 27 32 46 28 0 51 27 10 10 28 23 47 -153 0 0 28 28 25 10 59 5 28 77 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96 0 0 62 39 32 11 4 9 50 164 -2 62 25 56 62 53 11 62 4 1 63 15 24 - 95 0 0 62 59 39 11 4 13 50 165 -1 62 46 9 63 13 13 62 24 21 63 35 18 - 94 0 0 63 19 13 11 4 16 50 167 -1 63 5 47 63 32 42 62 44 7 63 54 39 - 93 0 0 63 38 13 11 4 20 49 168 0 63 24 52 63 51 37 63 3 20 64 13 26 - 92 0 0 63 56 40 11 4 23 49 170 0 63 43 24 64 10 0 63 22 0 64 31 40 - 91 0 0 64 14 36 11 4 27 49 171 1 64 1 24 64 27 50 63 40 8 64 49 23 - 90 0 0 64 31 59 11 4 30 49 173 1 64 18 53 64 45 9 63 57 44 65 6 34 - 89 0 0 64 48 52 11 4 33 49 174 2 64 35 50 65 1 57 64 14 49 65 23 14 - 88 0 0 65 5 15 11 4 37 48 176 2 64 52 18 65 18 15 64 31 24 65 39 25 - 87 0 0 65 21 8 11 4 40 48 177 3 65 8 15 65 34 4 64 47 29 65 55 6 - 86 0 0 65 36 32 11 4 43 48 178 3 65 23 44 65 49 23 65 3 5 66 10 18 - 85 0 0 65 51 28 11 4 46 48 180 4 65 38 44 66 4 14 65 18 12 66 25 2 - 84 0 0 66 5 56 11 4 49 47 181 4 65 53 17 66 18 38 65 32 51 66 39 18 - 83 0 0 66 19 57 11 4 52 47 183 5 66 7 22 66 32 34 65 47 3 66 53 7 - 82 0 0 66 33 31 11 4 55 47 184 5 66 21 0 66 46 4 66 0 49 67 6 30 - 81 0 0 66 46 39 11 4 57 47 185 5 66 34 12 66 59 8 66 14 7 67 19 26 - 80 0 0 66 59 21 11 5 0 46 187 6 66 46 59 67 11 46 66 27 1 67 31 58 - 79 0 0 67 11 39 11 5 3 46 188 6 66 59 20 67 24 0 66 39 28 67 44 5 - 78 0 0 67 23 32 11 5 6 46 189 7 67 11 17 67 35 49 66 51 32 67 55 47 - 77 0 0 67 35 1 11 5 8 46 190 7 67 22 50 67 47 14 67 3 11 68 7 6 - 76 0 0 67 46 7 11 5 11 45 192 7 67 34 0 67 58 16 67 14 26 68 18 2 - 75 0 0 67 56 49 11 5 13 45 193 8 67 44 46 68 8 55 67 25 19 68 28 35 - 74 0 0 68 7 9 11 5 16 45 194 8 67 55 10 68 19 11 67 35 48 68 38 46 - 73 0 0 68 17 8 11 5 18 45 196 9 68 5 11 68 29 6 67 45 55 68 48 35 - 72 0 0 68 26 44 11 5 21 44 197 9 68 14 51 68 38 39 67 55 41 68 58 2 - 71 0 0 68 36 0 11 5 23 44 198 9 68 24 10 68 47 51 68 5 5 69 7 9 - 70 0 0 68 44 55 11 5 25 44 199 10 68 33 8 68 56 43 68 14 8 69 15 55 - 69 0 0 68 53 29 11 5 28 44 201 10 68 41 46 69 5 14 68 22 50 69 24 21 - 68 0 0 69 1 43 11 5 30 43 202 10 68 50 3 69 13 26 68 31 13 69 32 28 - 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70 28 25 71 25 48 - 38 0 0 70 57 11 11 6 26 35 236 19 70 46 15 71 8 9 70 28 35 71 25 58 - 37 0 0 70 57 7 11 6 27 35 237 20 70 46 11 71 8 5 70 28 31 71 25 55 - 36 0 0 70 56 49 11 6 29 35 238 20 70 45 53 71 7 47 70 28 13 71 25 37 - 35 0 0 70 56 17 11 6 31 35 239 20 70 45 20 71 7 15 70 27 39 71 25 5 - 34 0 0 70 55 30 11 6 32 34 240 21 70 44 33 71 6 28 70 26 52 71 24 19 - 33 0 0 70 54 28 11 6 34 34 241 21 70 43 31 71 5 27 70 25 49 71 23 19 - 32 0 0 70 53 13 11 6 35 34 242 21 70 42 14 71 4 12 70 24 32 71 22 4 - 31 0 0 70 51 42 11 6 37 33 243 21 70 40 44 71 2 43 70 23 0 71 20 36 - 30 0 0 70 49 58 11 6 38 33 244 22 70 38 58 71 0 59 70 21 13 71 18 53 - 29 0 0 70 47 58 11 6 40 33 246 22 70 36 58 70 59 0 70 19 12 71 16 56 - 28 0 0 70 45 44 11 6 41 33 247 22 70 34 43 70 56 47 70 16 55 71 14 44 - 27 0 0 70 43 15 11 6 43 32 248 22 70 32 13 70 54 19 70 14 24 71 12 18 - 26 0 0 70 40 31 11 6 44 32 249 23 70 29 28 70 51 36 70 11 37 71 9 37 - 25 0 0 70 37 32 11 6 46 32 250 23 70 26 28 70 48 39 70 8 35 71 6 42 - 24 0 0 70 34 18 11 6 47 31 251 23 70 23 12 70 45 26 70 5 17 71 3 31 - 23 0 0 70 30 49 11 6 49 31 252 23 70 19 42 70 41 58 70 1 44 71 0 6 - 22 0 0 70 27 4 11 6 50 31 253 24 70 15 55 70 38 15 69 57 55 70 56 25 - 21 0 0 70 23 4 11 6 52 31 254 24 70 11 53 70 34 16 69 53 51 70 52 29 - 20 0 0 70 18 48 11 6 53 30 255 24 70 7 35 70 30 2 69 49 30 70 48 17 - 19 0 0 70 14 16 11 6 55 30 256 24 70 3 1 70 25 31 69 44 53 70 43 50 - 18 0 0 70 9 27 11 6 56 30 257 25 69 58 11 70 20 45 69 40 0 70 39 7 - 17 0 0 70 4 22 11 6 58 29 258 25 69 53 4 70 15 42 69 34 50 70 34 7 - 16 0 0 69 59 1 11 6 59 29 259 25 69 47 41 70 10 23 69 29 23 70 28 51 - 15 0 0 69 53 23 11 7 1 29 260 26 69 42 0 70 4 47 69 23 39 70 23 19 - 14 0 0 69 47 27 11 7 2 28 261 26 69 36 3 69 58 54 69 17 37 70 17 30 - 13 0 0 69 41 15 11 7 4 28 262 26 69 29 47 69 52 43 69 11 18 70 11 24 - 12 0 0 69 34 44 11 7 5 28 263 26 69 23 15 69 46 16 69 4 41 70 5 0 - 11 0 0 69 27 56 11 7 6 27 264 27 69 16 24 69 39 30 68 57 46 69 58 18 - 10 0 0 69 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67 38 43 5 0 0 66 53 42 11 7 29 21 280 31 66 41 15 67 6 11 66 21 11 67 26 29 6 0 0 66 40 52 11 7 30 21 281 31 66 28 22 66 53 25 66 8 11 67 13 51 7 0 0 66 27 38 11 7 32 20 282 31 66 15 3 66 40 15 65 54 46 67 0 47 8 0 0 66 13 58 11 7 33 20 283 32 66 1 19 66 26 39 65 40 54 66 47 18 9 0 0 65 59 51 11 7 35 19 284 32 65 47 8 66 12 37 65 26 36 66 33 23 10 0 0 65 45 17 11 7 36 19 285 32 65 32 30 65 58 8 65 11 51 66 19 1 11 0 0 65 30 17 11 7 37 19 286 32 65 17 24 65 43 11 64 56 39 66 4 12 12 0 0 65 14 48 11 7 38 18 287 33 65 1 51 65 27 47 64 40 58 65 48 55 13 0 0 64 58 50 11 7 40 18 288 33 64 45 49 65 11 54 64 24 49 65 33 10 14 0 0 64 42 24 11 7 41 17 289 33 64 29 18 64 55 32 64 8 11 65 16 56 15 0 0 64 25 28 11 7 42 17 290 34 64 12 17 64 38 41 63 51 3 65 0 12 16 0 0 64 8 1 11 7 44 16 291 34 63 54 46 64 21 19 63 33 24 64 42 58 17 0 0 63 50 4 11 7 45 16 292 34 63 36 45 64 3 27 63 15 15 64 25 13 18 0 0 63 31 36 11 7 46 15 293 34 63 18 11 63 45 3 62 56 34 64 6 58 19 0 0 63 12 36 11 7 47 14 293 35 62 59 6 63 26 8 62 37 22 63 48 10 20 0 0 62 53 3 11 7 48 14 294 35 62 39 29 63 6 40 62 17 37 63 28 50 21 0 0 62 32 57 11 7 50 13 295 35 62 19 18 62 46 39 61 57 19 63 8 56 22 0 0 62 12 18 11 7 51 13 296 35 61 58 34 62 26 4 61 36 27 62 48 30 23 0 0 61 51 4 11 7 52 12 297 36 61 37 16 62 4 55 61 15 2 62 27 29 24 0 0 61 29 16 11 7 53 12 298 36 61 15 24 61 43 12 60 53 2 62 5 54 25 0 0 61 6 54 11 7 54 11 299 36 60 52 56 61 20 54 60 30 27 61 43 43 26 0 0 60 43 55 11 7 55 10 300 36 60 29 53 60 58 0 60 7 17 61 20 57 27 0 0 60 20 21 11 7 56 10 301 37 60 6 15 60 34 31 59 43 31 60 57 35 28 0 0 59 56 10 11 7 57 9 302 37 59 42 0 60 10 25 59 19 9 60 33 36 29 0 0 59 31 23 11 7 58 8 302 37 59 17 8 59 45 42 58 54 10 60 9 0 30 0 0 59 5 59 11 7 58 8 303 37 58 51 39 59 20 22 58 28 35 59 43 48 31 0 0 58 39 57 11 7 59 7 304 37 58 25 34 58 54 25 58 2 22 59 17 57 32 0 0 58 13 18 11 8 0 6 305 38 57 58 51 58 27 50 57 35 33 58 51 29 33 0 0 57 46 1 11 8 0 6 306 38 57 31 30 58 0 37 57 8 6 58 24 23 34 0 0 57 18 7 11 8 1 5 307 38 57 3 31 57 32 46 56 40 1 57 56 39 35 0 0 56 49 34 11 8 2 4 308 38 56 34 55 57 4 17 56 11 19 57 28 16 36 0 0 56 20 24 11 8 2 4 308 38 56 5 41 56 35 10 55 41 59 56 59 15 37 0 0 55 50 35 11 8 2 3 309 39 55 35 49 56 5 25 55 12 2 56 29 35 38 0 0 55 20 9 11 8 3 2 310 39 55 5 20 55 35 2 .. .. .. 55 59 18 39 0 0 54 49 5 11 8 3 1 311 39 54 34 13 55 4 1 .. .. .. 55 28 22 40 0 0 54 17 24 11 8 3 1 312 39 54 2 29 54 32 23 .. .. .. 54 56 48 41 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 54 24 37 Data for the target star ------------------------ * name: TYC 1814-00959-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 09 52.4498 DE: +23 28 11.561 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .017 ) * V mag [mag]: 11.6 * B mag [mag]: 12.6 * Apparent position with proper motion RA(deg): 62.5854958117 DE(deg): 23.4919719488 * Equation of equinoxes (radians) : 0.000031670771984 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (757) Portlandia approx. diameter [km]: 32 approx. diameter ["]: .024 distance from Earth [AU]: 1.81000 * orbital information: orbit source: Preston date of fit: 2007 Aug 31 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 815 number of rejected observations: 33 time covered by the observations: 1912 Dec 31 - 2007 Jul 19 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.010, 72° remarks: * orbital elements for (757) Portlandia : Mean anomaly = 335.89225299 deg Arg. of pericenter = 44.37421089 deg Long. of node = 22.57569659 deg Inclination = 8.16660955 deg Eccentricity = 0.10952825 Semimajor axis = 2.37294234 AU Perihelion dist = 2.11303812 AU Mag: H = 9.99, G = 0.15 Epoch of elements : MJD 54345.46000000 TDT (2007 Sep 02.460) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 02 757 Portlandia 11h 3.1m UT 11.6 4 9 52.450 23 28 11.56TYC 1814-00959-1 12.6 14.4 32 1.9 1.810 3.074 18.38 -84.522 23.466 14.18 7.96 11.0514 -.24490 .56425 8.70439 3.78245 -0.00518 -0.00099 2000 334.4200552007 828.00000 44.374211 22.575697 8.1666100.109528252.372942342.1130381210.25 0.15 RATE 2.6963320 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.026 0.019 78.7 1.810 0.019 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 31, 17:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org