IOTA/IOTA-ES occultation update for (51) Nemausa / TYC 5736-00305-1 event on 2008 Oct 16, 10:12 UT Visible from Australia Summary ------- On 2008 Oct 16 UT, the 166 km diameter asteroid (51) Nemausa will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.3 mag (the magnitude of the asteroid) for at most 9.5 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: 99 * date and approx. time of event: 2008 Oct 16, 10:12 - 2008 Oct 16, 10:18 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 9.5 * Moon: 96 % sunlit, 110° distance * Sun: 92° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 169 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .022", 90° ) * approx speed of asteroid's shadow [km/s]: 17.5357 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5736-00305-1 by 51 Nemausa on 2008 Oct 16 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 118 0 0 -24 53 32 10 12 32 80 357 0 -25 39 39 -24 7 32 -25 59 58 -23 47 19 119 0 0 -25 0 24 10 12 38 79 351 -1 -25 46 29 -24 14 26 -26 6 48 -23 54 14 120 0 0 -25 7 1 10 12 44 79 346 -2 -25 53 4 -24 21 3 -26 13 22 -24 0 52 121 0 0 -25 13 21 10 12 50 79 341 -3 -25 59 23 -24 27 25 -26 19 40 -24 7 15 122 0 0 -25 19 24 10 12 56 78 336 -4 -26 5 25 -24 33 31 -26 25 42 -24 13 21 123 0 0 -25 25 12 10 13 2 78 332 -5 -26 11 11 -24 39 20 -26 31 27 -24 19 10 124 0 0 -25 30 43 10 13 8 77 328 -6 -26 16 41 -24 44 52 -26 36 56 -24 24 44 125 0 0 -25 35 58 10 13 13 77 325 -7 -26 21 54 -24 50 8 -26 42 9 -24 30 0 126 0 0 -25 40 57 10 13 19 76 321 -8 -26 26 51 -24 55 8 -26 47 6 -24 35 1 127 0 0 -25 45 38 10 13 25 75 318 -8 -26 31 32 -24 59 51 -26 51 46 -24 39 44 128 0 0 -25 50 4 10 13 31 75 316 -9 -26 35 56 -25 4 18 -26 56 10 -24 44 11 129 0 0 -25 54 13 10 13 37 74 313 -10 -26 40 4 -25 8 28 -27 0 17 -24 48 22 130 0 0 -25 58 5 10 13 42 73 311 -11 -26 43 56 -25 12 21 -27 4 8 -24 52 16 131 0 0 -26 1 41 10 13 48 73 308 -12 -26 47 31 -25 15 58 -27 7 42 -24 55 53 132 0 0 -26 5 0 10 13 54 72 306 -13 -26 50 49 -25 19 18 -27 11 0 -24 59 13 133 0 0 -26 8 3 10 13 59 71 304 -14 -26 53 51 -25 22 21 -27 14 2 -25 2 17 134 0 0 -26 10 49 10 14 5 70 303 -15 -26 56 36 -25 25 8 -27 16 47 -25 5 4 135 0 0 -26 13 18 10 14 10 69 301 -15 -26 59 4 -25 27 38 -27 19 15 -25 7 34 136 0 0 -26 15 31 10 14 16 69 299 -16 -27 1 16 -25 29 51 -27 21 27 -25 9 47 137 0 0 -26 17 26 10 14 22 68 298 -17 -27 3 12 -25 31 47 -27 23 22 -25 11 44 138 0 0 -26 19 6 10 14 27 67 296 -18 -27 4 51 -25 33 27 -27 25 0 -25 13 24 139 0 0 -26 20 28 10 14 32 66 295 -19 -27 6 13 -25 34 50 -27 26 22 -25 14 47 140 0 0 -26 21 34 10 14 38 65 294 -20 -27 7 18 -25 35 56 -27 27 28 -25 15 53 141 0 0 -26 22 23 10 14 43 64 293 -20 -27 8 7 -25 36 45 -27 28 17 -25 16 43 142 0 0 -26 22 56 10 14 48 64 292 -21 -27 8 39 -25 37 18 -27 28 49 -25 17 15 143 0 0 -26 23 11 10 14 54 63 290 -22 -27 8 55 -25 37 34 -27 29 5 -25 17 31 144 0 0 -26 23 10 10 14 59 62 289 -23 -27 8 54 -25 37 33 -27 29 4 -25 17 30 145 0 0 -26 22 53 10 15 4 61 288 -24 -27 8 37 -25 37 15 -27 28 46 -25 17 12 146 0 0 -26 22 18 10 15 9 60 287 -25 -27 8 3 -25 36 40 -27 28 12 -25 16 37 147 0 0 -26 21 27 10 15 14 59 286 -26 -27 7 12 -25 35 49 -27 27 22 -25 15 46 148 0 0 -26 20 20 10 15 20 58 286 -26 -27 6 5 -25 34 41 -27 26 14 -25 14 38 149 0 0 -26 18 55 10 15 25 58 285 -27 -27 4 41 -25 33 17 -27 24 51 -25 13 13 150 0 0 -26 17 15 10 15 29 57 284 -28 -27 3 0 -25 31 35 -27 23 11 -25 11 32 151 0 0 -26 15 17 10 15 34 56 283 -29 -27 1 3 -25 29 37 -27 21 14 -25 9 34 152 0 0 -26 13 3 10 15 39 55 282 -30 -26 58 50 -25 27 23 -27 19 1 -25 7 19 153 0 0 -26 10 33 10 15 44 54 281 -30 -26 56 20 -25 24 51 -27 16 31 -25 4 47 154 0 0 -26 7 46 10 15 49 53 281 -31 -26 53 34 -25 22 4 -27 13 46 -25 1 59 155 0 0 -26 4 42 10 15 54 52 280 -32 -26 50 32 -25 18 59 -27 10 43 -24 58 54 156 0 0 -26 1 22 10 15 58 51 279 -33 -26 47 13 -25 15 39 -27 7 25 -24 55 33 157 0 0 -25 57 46 10 16 3 50 279 -34 -26 43 37 -25 12 1 -27 3 50 -24 51 56 158 0 0 -25 53 53 10 16 7 50 278 -35 -26 39 46 -25 8 8 -26 59 59 -24 48 1 159 0 0 -25 49 45 10 16 12 49 277 -35 -26 35 38 -25 3 58 -26 55 51 -24 43 51 160 0 0 -25 45 19 10 16 16 48 277 -36 -26 31 14 -24 59 31 -26 51 28 -24 39 24 161 0 0 -25 40 38 10 16 21 47 276 -37 -26 26 34 -24 54 49 -26 46 48 -24 34 41 162 0 0 -25 35 40 10 16 25 46 275 -38 -26 21 37 -24 49 50 -26 41 53 -24 29 41 163 0 0 -25 30 27 10 16 29 45 275 -39 -26 16 25 -24 44 35 -26 36 41 -24 24 26 164 0 0 -25 24 57 10 16 33 44 274 -39 -26 10 57 -24 39 4 -26 31 13 -24 18 54 165 0 0 -25 19 11 10 16 37 43 274 -40 -26 5 13 -24 33 16 -26 25 30 -24 13 6 166 0 0 -25 13 10 10 16 42 42 273 -41 -25 59 12 -24 27 13 -26 19 30 -24 7 2 167 0 0 -25 6 52 10 16 46 41 272 -42 -25 52 56 -24 20 54 -26 13 15 -24 0 43 168 0 0 -25 0 19 10 16 49 40 272 -42 -25 46 25 -24 14 19 -26 6 44 -23 54 7 169 0 0 -24 53 30 10 16 53 40 271 -43 -25 39 38 -24 7 29 -25 59 58 -23 47 16 170 0 0 -24 46 25 10 16 57 39 271 -44 -25 32 35 -24 0 22 -25 52 55 -23 40 9 171 0 0 -24 39 5 10 17 1 38 270 -45 -25 25 16 -23 53 0 -25 45 38 -23 32 46 172 0 0 -24 31 29 10 17 4 37 270 -45 -25 17 42 -23 45 23 -25 38 5 -23 25 8 173 0 0 -24 23 38 10 17 8 36 269 -46 -25 9 53 -23 37 30 -25 30 16 -23 17 14 174 0 0 -24 15 32 10 17 12 35 269 -47 -25 1 49 -23 29 22 -25 22 13 -23 9 5 175 0 0 -24 7 11 10 17 15 34 268 -48 -24 53 29 -23 20 59 -25 13 54 -23 0 41 176 0 0 -23 58 34 10 17 18 33 268 -48 -24 44 55 -23 12 20 -25 5 21 -22 52 2 177 0 0 -23 49 43 10 17 22 32 267 -49 -24 36 5 -23 3 27 -24 56 32 -22 43 7 178 0 0 -23 40 36 10 17 25 31 267 -50 -24 27 1 -22 54 18 -24 47 28 -22 33 58 179 0 0 -23 31 15 10 17 28 30 266 -50 -24 17 42 -22 44 55 -24 38 10 -22 24 34 180 0 0 -23 21 39 10 17 31 29 266 -51 -24 8 8 -22 35 17 -24 28 38 -22 14 55 -179 0 0 -23 11 49 10 17 34 28 265 -52 -23 58 20 -22 25 25 -24 18 50 -22 5 2 -178 0 0 -23 1 44 10 17 37 27 265 -52 -23 48 18 -22 15 18 -24 8 49 -21 54 54 -177 0 0 -22 51 26 10 17 39 27 265 -53 -23 38 1 -22 4 57 -23 58 33 -21 44 32 -176 0 0 -22 40 53 10 17 42 26 264 -54 -23 27 30 -21 54 22 -23 48 3 -21 33 56 -175 0 0 -22 30 6 10 17 45 25 264 -54 -23 16 45 -21 43 33 -23 37 19 -21 23 7 -174 0 0 -22 19 5 10 17 47 24 263 -55 -23 5 47 -21 32 30 -23 26 22 -21 12 3 -173 0 0 -22 7 51 10 17 50 23 263 -56 -22 54 35 -21 21 14 -23 15 11 -21 0 45 -172 0 0 -21 56 23 10 17 52 22 263 -56 -22 43 9 -21 9 44 -23 3 46 -20 49 15 -171 0 0 -21 44 42 10 17 54 21 262 -57 -22 31 30 -20 58 1 -22 52 8 -20 37 30 -170 0 0 -21 32 48 10 17 56 20 262 -57 -22 19 38 -20 46 4 -22 40 17 -20 25 33 -169 0 0 -21 20 41 10 17 58 19 261 -58 -22 7 33 -20 33 55 -22 28 13 -20 13 23 -168 0 0 -21 8 21 10 18 0 18 261 -58 -21 55 15 -20 21 33 -22 15 56 -20 1 0 -167 0 0 -20 55 48 10 18 2 17 261 -59 -21 42 45 -20 8 58 -22 3 27 -19 48 24 -166 0 0 -20 43 3 10 18 4 16 260 -59 -21 30 2 -19 56 11 -21 50 45 -19 35 36 -165 0 0 -20 30 6 10 18 6 15 260 -60 -21 17 7 -19 43 12 -21 37 51 -19 22 36 -164 0 0 -20 16 57 10 18 7 14 259 -60 -21 4 0 -19 30 1 -21 24 45 -19 9 24 -163 0 0 -20 3 36 10 18 9 13 259 -61 -20 50 42 -19 16 38 -21 11 27 -18 56 1 -162 0 0 -19 50 4 10 18 10 12 259 -61 -20 37 11 -19 3 4 -20 57 58 -18 42 25 -161 0 0 -19 36 20 10 18 11 11 258 -61 -20 23 30 -18 49 18 -20 44 17 -18 28 39 -160 0 0 -19 22 26 10 18 13 10 258 -62 -20 9 37 -18 35 22 -20 30 25 -18 14 41 -159 0 0 -19 8 20 10 18 14 9 258 -62 -19 55 33 -18 21 14 -20 16 22 -18 0 33 -158 0 0 -18 54 4 10 18 15 8 257 -62 -19 41 19 -18 6 56 -20 2 9 -17 46 14 -157 0 0 -18 39 37 10 18 15 7 257 -62 -19 26 54 -17 52 28 -19 47 45 -17 31 45 -156 0 0 -18 25 1 10 18 16 6 257 -62 -19 12 19 -17 37 49 -19 33 11 -17 17 5 -155 0 0 -18 10 14 10 18 17 5 256 -63 -18 57 35 -17 23 1 -19 18 27 -17 2 16 -154 0 0 -17 55 18 10 18 17 4 256 -63 -18 42 40 -17 8 3 -19 3 33 -16 47 18 -153 0 0 -17 40 13 10 18 18 3 256 -63 -18 27 37 -16 52 56 -18 48 31 -16 32 10 -152 0 0 -17 24 58 10 18 18 2 256 -63 -18 12 24 -16 37 40 -18 33 19 -16 16 53 -151 0 0 -17 9 35 10 18 18 1 255 -63 -17 57 3 -16 22 15 -18 17 58 -16 1 28 -150 0 0 -16 54 4 10 18 18 0 255 -63 -17 41 33 -16 6 42 -18 2 28 -15 45 54 Uncertainty in time = +/- 2 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 5736-00305-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 42 40.6280 DE: -14 30 30.910 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 11.8 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (51) Nemausa approx. diameter [km]: 166 approx. diameter ["]: .102 distance from Earth [AU]: 2.24300 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 3617 number of rejected observations: 381 time covered by the observations: 1906 Jun 27 - 2008 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.007, 88° remarks: * orbital elements for (51) Nemausa : Mean anomaly = 133.76929859 deg Arg. of pericenter = 3.26276576 deg Long. of node = 176.10367308 deg Inclination = 9.97410817 deg Eccentricity = 0.06710732 Semimajor axis = 2.36613702 AU Perihelion dist = 2.20735191 AU Mag: H = 7.39, G = 0.08 Epoch of elements : MJD 54755.42500000 TDT (2008 Oct 16.425) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 16 51 Nemausa 10h 12.3m UT 11.8 19 42 40.628-14 30 30.91TYC 5736-00305-1 12.6 12.3 166 9.5 2.243 2.652 -4.84 117.2813 -14.507 23.29 -9.10 10.2056 -0.02279 -0.17384 9.82027 -1.23495 0.00555 0.00095 2000 132.30022420081011.00000 3.262766176.103673 9.9741080.06710732 2.3661370 2.2073519 7.4 5.00.08 RATE 2.7079720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.022 90 1.22 0.022 0 54740.5020081016_0305-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 05:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org