IOTA/IOTA-ES occultation update for (1765) Wrubel / HIP 16961 event on 2008 Mar 29, 05:44 UT Visible from N Pacific Summary ------- On 2008 Mar 29 UT, the 42 km diameter asteroid (1765) Wrubel will occult a 7.7 mag star in the constellation Taurus for observers along a path across N Pacific. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.3 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.2 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: . The event at a glimpse ---------------------- * Rank: 54 * date and approx. time of event: 2008 Mar 29, 05:47 - 2008 Mar 29, 05:47 UT * midpoint of event [JD]: 2454554.73961667 * magnitude of target star: 7.7 * magnitude drop [mag]: 8.3 * estimated maximum duration [s]: 1.2 * Moon: 56 % sunlit, 145° distance * Sun: 48° distance * rough path description: N Pacific The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 1.17 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .019", 72° ) * approx speed of asteroid's shadow [km/s]: 35.8934 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 16961 by 1765 Wrubel on 2008 Mar 29 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 -171 0 0 50 19 45 5 47 1 41 249 0 50 7 37 50 31 54 49 39 18 51 0 23 -170 0 0 50 20 42 5 47 2 40 250 -1 50 8 34 50 32 51 49 40 15 51 1 19 -169 0 0 50 21 17 5 47 3 40 251 -1 50 9 10 50 33 26 49 40 51 51 1 54 -168 0 0 50 21 31 5 47 5 39 252 -2 50 9 24 50 33 40 49 41 5 51 2 8 -167 0 0 50 21 24 5 47 6 39 253 -3 50 9 16 50 33 32 49 40 57 51 2 1 -166 0 0 50 20 55 5 47 7 38 254 -3 50 8 47 50 33 4 49 40 28 51 1 32 -165 0 0 50 20 5 5 47 9 37 255 -4 50 7 57 50 32 14 49 39 38 51 0 43 -164 0 0 50 18 53 5 47 10 37 255 -5 50 6 45 50 31 2 49 38 25 50 59 32 -163 0 0 50 17 21 5 47 11 36 256 -5 50 5 12 50 29 30 49 36 52 50 58 0 -162 0 0 50 15 26 5 47 13 36 257 -6 50 3 18 50 27 36 49 34 56 50 56 7 -161 0 0 50 13 11 5 47 14 35 258 -7 50 1 2 50 25 21 49 32 39 50 53 53 -160 0 0 50 10 34 5 47 15 34 259 -7 49 58 24 50 22 44 49 30 0 50 51 17 -159 0 0 50 7 35 5 47 16 34 260 -8 49 55 25 50 19 46 49 27 0 50 48 21 -158 0 0 50 4 15 5 47 17 33 261 -8 49 52 4 50 16 26 49 23 38 50 45 2 -157 0 0 50 0 33 5 47 19 32 262 -9 49 48 21 50 12 45 49 19 54 50 41 23 -156 0 0 49 56 29 5 47 20 32 263 -10 49 44 17 50 8 42 49 15 48 50 37 22 -155 0 0 49 52 4 5 47 21 31 263 -10 49 39 51 50 4 18 49 11 20 50 32 59 -154 0 0 49 47 17 5 47 22 31 264 -11 49 35 3 49 59 31 49 6 30 50 28 15 -153 0 0 49 42 7 5 47 23 30 265 -12 49 29 53 49 54 23 49 1 17 50 23 8 -152 0 0 49 36 36 5 47 24 29 266 -12 49 24 21 49 48 53 48 55 43 50 17 41 -151 0 0 49 30 43 5 47 25 29 267 -13 49 18 26 49 43 1 48 49 46 50 11 51 -150 0 0 49 24 28 5 47 26 28 268 -14 49 12 10 49 36 46 48 43 27 50 5 39 -149 0 0 49 17 50 5 47 27 27 268 -14 49 5 31 49 30 10 48 36 46 49 59 5 -148 0 0 49 10 50 5 47 28 27 269 -15 48 58 30 49 23 11 48 29 42 49 52 9 -147 0 0 49 3 27 5 47 29 26 270 -16 48 51 5 49 15 49 48 22 15 49 44 50 -146 0 0 48 55 41 5 47 30 25 271 -16 48 43 19 49 8 5 48 14 25 49 37 9 -145 0 0 48 47 33 5 47 31 25 272 -17 48 35 9 48 59 58 48 6 12 49 29 6 -144 0 0 48 39 2 5 47 32 24 273 -18 48 26 37 48 51 28 47 57 36 49 20 39 -143 0 0 48 30 8 5 47 33 23 273 -18 48 17 41 48 42 36 47 48 37 49 11 50 -142 0 0 48 20 50 5 47 34 23 274 -19 48 8 22 48 33 20 47 39 15 49 2 38 -141 0 0 48 11 10 5 47 35 22 275 -19 47 58 40 48 23 41 47 29 29 48 53 2 -140 0 0 48 1 5 5 47 36 21 276 -20 47 48 34 48 13 38 47 19 19 48 43 4 -139 0 0 47 50 38 5 47 37 21 276 -21 47 38 4 48 3 12 47 8 46 48 32 41 -138 0 0 47 39 46 5 47 37 20 277 -22 47 27 11 47 52 22 46 57 48 48 21 56 -137 0 0 47 28 30 5 47 38 19 278 -22 47 15 54 47 41 8 46 46 27 48 10 46 -136 0 0 47 16 51 5 47 39 19 279 -23 47 4 12 47 29 30 46 34 41 47 59 12 -135 0 0 47 4 47 5 47 40 18 280 -24 46 52 7 47 17 29 46 22 31 47 47 15 -134 0 0 46 52 19 5 47 40 17 280 -24 46 39 36 47 5 2 46 9 57 47 34 53 -133 0 0 46 39 26 5 47 41 16 281 -25 46 26 42 46 52 11 45 56 58 47 22 7 -132 0 0 46 26 9 5 47 42 16 282 -26 46 13 22 46 38 56 45 43 34 47 8 56 -131 0 0 46 12 26 5 47 42 15 283 -26 45 59 38 46 25 16 45 29 45 46 55 20 -130 0 0 45 58 19 5 47 43 14 283 -27 45 45 29 46 11 10 45 15 31 46 41 20 -129 0 0 45 43 47 5 47 44 13 284 -28 45 30 54 45 56 40 45 0 51 46 26 55 -128 0 0 45 28 49 5 47 44 13 285 -28 45 15 54 45 41 45 44 45 47 46 12 4 -127 0 0 45 13 26 5 47 45 12 285 -29 45 0 29 45 26 24 44 30 16 45 56 48 -126 0 0 44 57 37 5 47 45 11 286 -30 44 44 38 45 10 37 44 14 21 45 41 7 -125 0 0 44 41 23 5 47 46 10 287 -30 44 28 22 44 54 25 43 57 59 45 25 0 -124 0 0 44 24 43 5 47 46 10 288 -31 44 11 40 44 37 47 43 41 12 45 8 27 -123 0 0 44 7 37 5 47 47 9 288 -32 43 54 31 44 20 43 43 23 58 44 51 29 -122 0 0 43 50 5 5 47 47 8 289 -33 43 36 57 44 3 14 43 6 19 44 34 4 -121 0 0 43 32 6 5 47 47 7 290 -33 43 18 57 43 45 18 42 48 13 44 16 14 -120 0 0 43 13 42 5 47 48 7 290 -34 43 0 30 43 26 56 42 29 41 43 57 57 -119 0 0 42 54 51 5 47 48 6 291 -35 42 41 37 43 8 7 42 10 43 43 39 14 -118 0 0 42 35 34 5 47 48 5 292 -36 42 22 18 42 48 52 41 51 18 43 20 5 -117 0 0 42 15 51 5 47 48 4 292 -36 42 2 32 42 29 11 41 31 27 43 0 29 -116 0 0 41 55 41 5 47 49 3 293 -37 41 42 20 42 9 4 41 11 9 42 40 27 -115 0 0 41 35 5 5 47 49 3 294 -38 41 21 41 41 48 30 40 50 25 42 19 58 -114 0 0 41 14 2 5 47 49 2 294 -38 41 0 36 41 27 29 40 29 15 41 59 3 -113 0 0 40 52 32 5 47 49 1 295 -39 40 39 4 41 6 2 40 7 38 41 37 42 -112 0 0 40 30 37 5 47 49 0 296 -40 .. .. .. 40 44 8 .. .. .. 41 15 53 Uncertainty in time = +/- 2 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: HIP 16961 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 38 10.9488 DE: +19 21 37.340 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .019, .015 ) * V mag [mag]: 7.7 * B mag [mag]: 8.1 * Apparent position with proper motion RA(deg): 54.6626889090 DE(deg): 19.3884836966 * Equation of equinoxes (radians) : 0.000041116459473 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1765) Wrubel approx. diameter [km]: 42 approx. diameter ["]: .016 distance from Earth [AU]: 3.72500 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 666 number of rejected observations: 24 time covered by the observations: 1917 Dec 05 - 2008 Jan 23 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.012, 55° remarks: * orbital elements for (1765) Wrubel : Mean anomaly = 76.97204918 deg Arg. of pericenter = 262.50282431 deg Long. of node = 70.75525544 deg Inclination = 19.98716101 deg Eccentricity = 0.17585445 Semimajor axis = 3.17490532 AU Perihelion dist = 2.61658409 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 54554.24000000 TDT (2008 Mar 29.240) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 29 1765 Wrubel 5h 45.0m UT 7.7 3 38 10.949 19 21 37.34HIP 16961 8.1 16.0 42 1.2 3.725 3.123 18.29 141.2786 19.356 94.93 3.54 5.7508 -0.13633 0.32736 18.71918 7.74776 0.00425 0.00100 2000 76.2333392008 325.00000262.502824 70.755255 19.9871610.17585445 3.1749053 2.6165841 9.9 5.00.15 RATE 1.7422400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.019 72 2.17 0.018 0 54510.5020080329__16961 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 20:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org