IOTA/IOTA-ES occultation update for (535) Montague / TYC 6380-01039-1 event on 2012 Nov 12, 10:17 UT Visible from E Australia Summary ------- On 2012 Nov 12 UT, the 75 km diameter asteroid (535) Montague will occult a 8.9 mag star in the constellation Aquarius for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.4 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: 82 * date and approx. time of event: 2012 Nov 12, 10:16 - 2012 Nov 12, 10:24 UT * geocentric midpoint of event [JD]: 2456243.92885 * magnitude of target star: 8.9 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 5.4 * Moon: 4 % sunlit, 118° distance * Sun: 97° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .026", 87° ) * approx speed of asteroid's shadow [km/s]: 13.9185 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6380-01039-1 by 535 Montague on 2012 Nov 12 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 ' " Longitude Longitude Longitude Longitude -151 9 45 10 0 0 10 24 39 1 250 -78 -150 6 29 -152 11 14 ... .. .. -153 28 46 -153 42 40 9 0 0 10 24 37 4 249 -79 -152 43 48 -154 40 8 -151 24 58 -155 52 54 Latitude Latitude Latitude Latitude -155 0 0 8 27 48 10 24 36 6 249 -79 8 3 54 8 51 39 7 32 42 9 22 31 -156 0 0 8 1 58 10 24 35 7 249 -79 7 37 57 8 25 55 7 6 36 8 56 56 -157 0 0 7 35 22 10 24 34 8 249 -79 7 11 14 7 59 26 6 39 45 8 30 35 -158 0 0 7 8 1 10 24 33 9 249 -79 6 43 46 7 32 11 6 12 8 8 3 30 -159 0 0 6 39 54 10 24 31 10 249 -79 6 15 32 7 4 11 5 43 45 7 35 39 -160 0 0 6 11 2 10 24 30 11 249 -78 5 46 32 6 35 26 5 14 35 7 7 3 -161 0 0 5 41 23 10 24 28 12 249 -78 5 16 47 6 5 55 4 44 40 6 37 41 -162 0 0 5 10 59 10 24 26 13 248 -77 4 46 15 5 35 38 4 13 58 6 7 34 -163 0 0 4 39 49 10 24 23 14 248 -76 4 14 58 5 4 36 3 42 31 5 36 41 -164 0 0 4 7 54 10 24 21 16 248 -76 3 42 54 4 32 48 3 10 17 5 5 3 -165 0 0 3 35 12 10 24 18 17 248 -75 3 10 5 4 0 15 2 37 18 4 32 40 -166 0 0 3 1 46 10 24 15 18 248 -74 2 36 30 3 26 56 2 3 32 3 59 31 -167 0 0 2 27 33 10 24 12 19 248 -73 2 2 10 2 52 52 1 29 1 3 25 38 -168 0 0 1 52 36 10 24 9 20 248 -72 1 27 4 2 18 3 0 53 45 2 50 59 -169 0 0 1 16 54 10 24 5 21 248 -71 0 51 14 1 42 29 0 17 43 2 15 36 -170 0 0 0 40 27 10 24 1 22 248 -70 0 14 39 1 6 10 - 0 19 3 1 39 28 -171 0 0 0 3 17 10 23 57 24 248 -69 - 0 22 40 0 29 8 - 0 56 33 1 2 36 -172 0 0 - 0 34 38 10 23 53 25 249 -68 - 1 0 43 - 0 8 38 - 1 34 47 0 25 1 -173 0 0 - 1 13 15 10 23 49 26 249 -67 - 1 39 29 - 0 47 7 - 2 13 45 - 0 13 17 -174 0 0 - 1 52 35 10 23 44 27 249 -66 - 2 18 58 - 1 26 19 - 2 53 25 - 0 52 18 -175 0 0 - 2 32 37 10 23 39 28 249 -65 - 2 59 9 - 2 6 12 - 3 33 47 - 1 32 0 -176 0 0 - 3 13 20 10 23 34 30 249 -64 - 3 40 0 - 2 46 46 - 4 14 50 - 2 12 23 -177 0 0 - 3 54 44 10 23 29 31 249 -62 - 4 21 32 - 3 28 1 - 4 56 33 - 2 53 27 -178 0 0 - 4 36 46 10 23 23 32 250 -61 - 5 3 43 - 4 9 55 - 5 38 55 - 3 35 10 -179 0 0 - 5 19 27 10 23 17 33 250 -60 - 5 46 33 - 4 52 28 - 6 21 56 - 4 17 32 -180 0 0 - 6 2 45 10 23 12 34 250 -59 - 6 30 0 - 5 35 38 - 7 5 34 - 5 0 31 179 0 0 - 6 46 40 10 23 5 36 251 -58 - 7 14 2 - 6 19 23 - 7 49 48 - 5 44 6 178 0 0 - 7 31 9 10 22 59 37 251 -56 - 7 58 40 - 7 3 44 - 8 34 36 - 6 28 16 177 0 0 - 8 16 11 10 22 52 38 251 -55 - 8 43 50 - 7 48 39 - 9 19 58 - 7 13 0 176 0 0 - 9 1 45 10 22 46 39 252 -54 - 9 29 33 - 8 34 5 -10 5 51 - 7 58 16 175 0 0 - 9 47 50 10 22 39 40 252 -53 -10 15 46 - 9 20 2 -10 52 14 - 8 44 3 174 0 0 -10 34 24 10 22 31 42 253 -51 -11 2 27 -10 6 28 -11 39 6 - 9 30 19 173 0 0 -11 21 24 10 22 24 43 254 -50 -11 49 35 -10 53 21 -12 26 24 -10 17 2 172 0 0 -12 8 50 10 22 17 44 254 -49 -12 37 8 -11 40 39 -13 14 6 -11 4 11 171 0 0 -12 56 39 10 22 9 45 255 -48 -13 25 4 -12 28 21 -14 2 12 -11 51 44 170 0 0 -13 44 49 10 22 1 46 256 -46 -14 13 21 -13 16 24 -14 50 37 -12 39 38 169 0 0 -14 33 18 10 21 53 47 257 -45 -15 1 56 -14 4 47 -15 39 22 -13 27 53 168 0 0 -15 22 4 10 21 45 49 257 -44 -15 50 49 -14 53 26 -16 28 22 -14 16 25 167 0 0 -16 11 5 10 21 36 50 258 -43 -16 39 55 -15 42 21 -17 17 37 -15 5 12 166 0 0 -17 0 18 10 21 28 51 259 -41 -17 29 14 -16 31 29 -18 7 3 -15 54 13 165 0 0 -17 49 41 10 21 19 52 261 -40 -18 18 43 -17 20 47 -18 56 39 -16 43 24 164 0 0 -18 39 12 10 21 10 53 262 -39 -19 8 19 -18 10 14 -19 46 21 -17 32 44 163 0 0 -19 28 49 10 21 1 54 263 -37 -19 57 59 -18 59 46 -20 36 7 -18 22 11 162 0 0 -20 18 28 10 20 53 55 264 -36 -20 47 43 -19 49 21 -21 25 56 -19 11 41 161 0 0 -21 8 7 10 20 43 56 266 -35 -21 37 26 -20 38 57 -22 15 43 -20 1 12 160 0 0 -21 57 44 10 20 34 57 267 -34 -22 27 6 -21 28 31 -23 5 28 -20 50 42 159 0 0 -22 47 17 10 20 25 58 269 -32 -23 16 41 -22 18 1 -23 55 7 -21 40 9 158 0 0 -23 36 42 10 20 16 59 271 -31 -24 6 9 -23 7 24 -24 44 37 -22 29 29 157 0 0 -24 25 58 10 20 7 60 273 -30 -24 55 26 -23 56 38 -25 33 57 -23 18 41 156 0 0 -25 15 2 10 19 57 61 275 -29 -25 44 31 -24 45 40 -26 23 3 -24 7 41 155 0 0 -26 3 51 10 19 48 62 277 -27 -26 33 21 -25 34 29 -27 11 54 -24 56 29 154 0 0 -26 52 23 10 19 39 63 279 -26 -27 21 53 -26 23 1 -28 0 27 -25 45 1 153 0 0 -27 40 36 10 19 29 63 281 -25 -28 10 6 -27 11 14 -28 48 39 -26 33 14 152 0 0 -28 28 28 10 19 20 64 284 -24 -28 57 58 -27 59 7 -29 36 30 -27 21 8 151 0 0 -29 15 57 10 19 10 65 286 -22 -29 45 25 -28 46 36 -30 23 55 -28 8 39 150 0 0 -30 2 59 10 19 1 65 289 -21 -30 32 26 -29 33 41 -31 10 54 -28 55 45 149 0 0 -30 49 35 10 18 52 66 292 -20 -31 18 59 -30 20 18 -31 57 24 -29 42 26 148 0 0 -31 35 41 10 18 43 66 295 -19 -32 5 2 -31 6 27 -32 43 24 -30 28 37 147 0 0 -32 21 15 10 18 33 67 298 -18 -32 50 34 -31 52 4 -33 28 52 -31 14 19 146 0 0 -33 6 17 10 18 24 67 301 -17 -33 35 32 -32 37 10 -34 13 45 -31 59 29 145 0 0 -33 50 45 10 18 15 68 304 -15 -34 19 56 -33 21 41 -34 58 4 -32 44 5 144 0 0 -34 34 36 10 18 6 68 308 -14 -35 3 43 -34 5 37 -35 41 45 -33 28 7 143 0 0 -35 17 51 10 17 57 68 311 -13 -35 46 53 -34 48 56 -36 24 48 -34 11 32 142 0 0 -36 0 27 10 17 49 68 314 -12 -36 29 24 -35 31 37 -37 7 12 -34 54 19 141 0 0 -36 42 23 10 17 40 68 318 -11 -37 11 14 -36 13 39 -37 48 56 -35 36 28 140 0 0 -37 23 39 10 17 31 68 321 -10 -37 52 24 -36 55 1 -38 29 58 -36 17 57 139 0 0 -38 4 14 10 17 23 68 324 -9 -38 32 53 -37 35 42 -39 10 18 -36 58 46 138 0 0 -38 44 6 10 17 14 68 327 -8 -39 12 39 -38 15 40 -39 49 56 -37 38 53 137 0 0 -39 23 15 10 17 6 68 331 -7 -39 51 41 -38 54 56 -40 28 49 -38 18 17 136 0 0 -40 1 41 10 16 58 68 334 -6 -40 30 0 -39 33 29 -41 6 59 -38 56 59 135 0 0 -40 39 23 10 16 50 68 337 -5 -41 7 35 -40 11 18 -41 44 24 -39 34 58 134 0 0 -41 16 21 10 16 42 67 340 -4 -41 44 25 -40 48 23 -42 21 4 -40 12 12 133 0 0 -41 52 34 10 16 34 67 343 -3 -42 20 30 -41 24 44 -42 57 0 -40 48 43 132 0 0 -42 28 2 10 16 27 67 346 -2 -42 55 51 -42 0 20 -43 32 10 -41 24 29 131 0 0 -43 2 46 10 16 19 66 348 -1 -43 30 26 -42 35 12 -44 6 34 -41 59 30 130 0 0 -43 36 44 10 16 12 66 351 0 -44 4 17 -43 9 18 -44 40 14 -42 33 47 Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 6380-01039-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 07 44.9207 DE: -19 41 14.457 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .024 ) * V mag [mag]: 8.9 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (535) Montague approx. diameter [km]: 75 approx. diameter ["]: .044 distance from Earth [AU]: 2.32500 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1188 number of rejected observations: 100 time covered by the observations: 1904 May 07 - 2012 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 74° remarks: * orbital elements for (535) Montague : Mean anomaly = 197.82777418 deg Arg. of pericenter = 67.29623845 deg Long. of node = 84.84419045 deg Inclination = 6.78201159 deg Eccentricity = 0.02529770 Semimajor axis = 2.56847520 AU Perihelion dist = 2.50349868 AU Mag: H = 9.28, G = 0.15 Epoch of elements : MJD 56243.42900000 TDT (2012 Nov 12.429) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 12 535 Montague 10h 17.5m UT 8.9 22 7 44.921-19 41 14.46TYC 6380-01039-1 10.0 14.3 75 5.4 2.325 1.773 16.01 125.6011 -19.692 21.67 -17.86 10.2924 0.19779 -0.30835 6.61906 4.23141 0.00541 0.00215 2000 197.006745201211 9.00000 67.296238 84.844190 6.7820120.02529770 2.5684752 2.5034987 9.3 5.00.15 RATE 2.3943690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.026 87 1.65 0.029 0 0-3 3 056226.0020121112_1039-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org