IOTA/IOTA-ES occultation update for (1167) Dubiago / TYC 5788-00725-1 event on 2012 Nov 23, 13:06 UT Visible from NW Australia Summary ------- On 2012 Nov 23 UT, the 76 km diameter asteroid (1167) Dubiago will occult a 10.2 mag star in the constellation Aquarius for observers along a path across NW Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.8 mag (the magnitude of the asteroid) for at most 3.7 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: 2012 Nov 23, 13:07 - 2012 Nov 23, 13:11 UT * geocentric midpoint of event [JD]: 2456255.04650833 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 3.7 * Moon: 78 % sunlit, 41° distance * Sun: 84° distance * rough path description: NW Australia The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.82 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .027", 82° ) * approx speed of asteroid's shadow [km/s]: 20.3756 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5788-00725-1 by 1167 Dubiago on 2012 Nov 23 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 82 0 0 -28 27 10 13 7 53 65 320 -1 -28 50 13 -28 4 11 -29 28 10 -27 26 37 83 0 0 -28 13 53 13 7 58 64 318 -1 -28 36 57 -27 50 53 -29 14 55 -27 13 19 84 0 0 -28 0 29 13 8 3 64 315 -2 -28 23 34 -27 37 29 -29 1 33 -26 59 53 85 0 0 -27 46 58 13 8 8 63 313 -3 -28 10 3 -27 23 57 -28 48 3 -26 46 20 86 0 0 -27 33 20 13 8 13 63 311 -4 -27 56 26 -27 10 19 -28 34 27 -26 32 41 87 0 0 -27 19 36 13 8 18 62 309 -5 -27 42 42 -26 56 34 -28 20 45 -26 18 55 88 0 0 -27 5 46 13 8 23 62 307 -6 -27 28 52 -26 42 43 -28 6 56 -26 5 3 89 0 0 -26 51 49 13 8 27 61 306 -7 -27 14 57 -26 28 46 -27 53 1 -25 51 6 90 0 0 -26 37 47 13 8 32 61 304 -8 -27 0 55 -26 14 43 -27 39 0 -25 37 2 91 0 0 -26 23 40 13 8 37 60 302 -9 -26 46 48 -26 0 36 -27 24 54 -25 22 54 92 0 0 -26 9 27 13 8 42 59 301 -10 -26 32 36 -25 46 23 -27 10 42 -25 8 40 93 0 0 -25 55 10 13 8 47 59 299 -11 -26 18 19 -25 32 5 -26 56 26 -24 54 22 94 0 0 -25 40 48 13 8 52 58 298 -12 -26 3 57 -25 17 43 -26 42 5 -24 39 59 95 0 0 -25 26 22 13 8 56 57 296 -12 -25 49 32 -25 3 16 -26 27 40 -24 25 32 96 0 0 -25 11 52 13 9 1 57 295 -13 -25 35 2 -24 48 46 -26 13 11 -24 11 1 97 0 0 -24 57 18 13 9 6 56 293 -14 -25 20 29 -24 34 12 -25 58 38 -23 56 27 98 0 0 -24 42 41 13 9 10 55 292 -15 -25 5 52 -24 19 35 -25 44 1 -23 41 49 99 0 0 -24 28 1 13 9 15 54 291 -16 -24 51 12 -24 4 54 -25 29 22 -23 27 9 100 0 0 -24 13 18 13 9 20 53 290 -17 -24 36 29 -23 50 11 -25 14 39 -23 12 25 101 0 0 -23 58 33 13 9 24 53 289 -18 -24 21 44 -23 35 26 -24 59 54 -22 57 40 102 0 0 -23 43 46 13 9 29 52 288 -19 -24 6 57 -23 20 39 -24 45 7 -22 42 52 103 0 0 -23 28 57 13 9 33 51 287 -20 -23 52 8 -23 5 50 -24 30 19 -22 28 3 104 0 0 -23 14 6 13 9 38 50 285 -21 -23 37 18 -22 50 59 -24 15 28 -22 13 12 105 0 0 -22 59 15 13 9 42 49 285 -22 -23 22 26 -22 36 7 -24 0 37 -21 58 21 106 0 0 -22 44 22 13 9 46 49 284 -23 -23 7 34 -22 21 15 -23 45 44 -21 43 29 107 0 0 -22 29 29 13 9 51 48 283 -23 -22 52 41 -22 6 22 -23 30 51 -21 28 36 108 0 0 -22 14 36 13 9 55 47 282 -24 -22 37 47 -21 51 29 -23 15 58 -21 13 43 109 0 0 -21 59 44 13 9 59 46 281 -25 -22 22 54 -21 36 37 -23 1 5 -20 58 51 110 0 0 -21 44 51 13 10 3 45 280 -26 -22 8 2 -21 21 44 -22 46 12 -20 43 59 111 0 0 -21 30 0 13 10 7 44 279 -27 -21 53 10 -21 6 53 -22 31 20 -20 29 8 112 0 0 -21 15 9 13 10 11 43 279 -28 -21 38 20 -20 52 3 -22 16 29 -20 14 18 113 0 0 -21 0 21 13 10 15 42 278 -29 -21 23 31 -20 37 15 -22 1 40 -19 59 30 114 0 0 -20 45 34 13 10 19 41 277 -30 -21 8 44 -20 22 28 -21 46 52 -19 44 44 115 0 0 -20 30 49 13 10 23 41 277 -31 -20 53 58 -20 7 43 -21 32 6 -19 30 0 116 0 0 -20 16 7 13 10 27 40 276 -31 -20 39 16 -19 53 2 -21 17 23 -19 15 18 117 0 0 -20 1 27 13 10 30 39 275 -32 -20 24 36 -19 38 22 -21 2 43 -19 0 40 118 0 0 -19 46 51 13 10 34 38 275 -33 -20 9 59 -19 23 47 -20 48 5 -18 46 5 119 0 0 -19 32 18 13 10 38 37 274 -34 -19 55 26 -19 9 14 -20 33 31 -18 31 33 120 0 0 -19 17 49 13 10 41 36 274 -35 -19 40 57 -18 54 46 -20 19 1 -18 17 5 121 0 0 -19 3 24 13 10 44 35 273 -36 -19 26 31 -18 40 21 -20 4 35 -18 2 42 122 0 0 -18 49 4 13 10 48 34 273 -37 -19 12 10 -18 26 1 -19 50 13 -17 48 23 123 0 0 -18 34 48 13 10 51 33 272 -37 -18 57 54 -18 11 46 -19 35 56 -17 34 8 124 0 0 -18 20 38 13 10 54 32 272 -38 -18 43 43 -17 57 36 -19 21 44 -17 19 59 125 0 0 -18 6 33 13 10 57 31 271 -39 -18 29 37 -17 43 32 -19 7 37 -17 5 56 126 0 0 -17 52 33 13 11 0 30 271 -40 -18 15 37 -17 29 33 -18 53 36 -16 51 58 127 0 0 -17 38 40 13 11 3 29 270 -41 -18 1 43 -17 15 40 -18 39 41 -16 38 6 128 0 0 -17 24 53 13 11 6 28 270 -42 -17 47 56 -17 1 54 -18 25 52 -16 24 21 129 0 0 -17 11 12 13 11 9 27 269 -42 -17 34 14 -16 48 14 -18 12 10 -16 10 42 130 0 0 -16 57 39 13 11 11 26 269 -43 -17 20 40 -16 34 41 -17 58 35 -15 57 10 131 0 0 -16 44 12 13 11 14 25 269 -44 -17 7 13 -16 21 16 -17 45 6 -15 43 46 132 0 0 -16 30 53 13 11 16 24 268 -45 -16 53 53 -16 7 57 -17 31 46 -15 30 29 133 0 0 -16 17 42 13 11 19 23 268 -45 -16 40 42 -15 54 47 -17 18 32 -15 17 20 134 0 0 -16 4 39 13 11 21 22 267 -46 -16 27 38 -15 41 45 -17 5 27 -15 4 19 135 0 0 -15 51 45 13 11 23 21 267 -47 -16 14 42 -15 28 51 -16 52 31 -14 51 26 136 0 0 -15 38 59 13 11 25 20 267 -48 -16 1 56 -15 16 6 -16 39 43 -14 38 42 137 0 0 -15 26 21 13 11 27 19 266 -48 -15 49 18 -15 3 29 -16 27 3 -14 26 7 138 0 0 -15 13 53 13 11 29 19 266 -49 -15 36 49 -14 51 2 -16 14 33 -14 13 41 139 0 0 -15 1 35 13 11 31 18 266 -50 -15 24 29 -14 38 44 -16 2 12 -14 1 24 140 0 0 -14 49 26 13 11 33 17 266 -50 -15 12 19 -14 26 36 -15 50 1 -13 49 17 141 0 0 -14 37 26 13 11 35 16 265 -51 -15 0 19 -14 14 37 -15 37 59 -13 37 20 142 0 0 -14 25 37 13 11 36 15 265 -51 -14 48 29 -14 2 49 -15 26 8 -13 25 34 143 0 0 -14 13 59 13 11 37 14 265 -52 -14 36 50 -13 51 11 -15 14 27 -13 13 57 144 0 0 -14 2 30 13 11 39 13 264 -53 -14 25 21 -13 39 44 -15 2 57 -13 2 31 145 0 0 -13 51 13 13 11 40 12 264 -53 -14 14 3 -13 28 28 -14 51 37 -12 51 16 146 0 0 -13 40 7 13 11 41 11 264 -54 -14 2 56 -13 17 22 -14 40 29 -12 40 12 147 0 0 -13 29 12 13 11 42 10 264 -54 -13 52 0 -13 6 28 -14 29 31 -12 29 19 148 0 0 -13 18 28 13 11 43 9 263 -55 -13 41 15 -12 55 45 -14 18 46 -12 18 38 149 0 0 -13 7 56 13 11 44 8 263 -55 -13 30 42 -12 45 14 -14 8 11 -12 8 8 150 0 0 -12 57 36 13 11 45 7 263 -56 -13 20 22 -12 34 55 -13 57 49 -11 57 50 151 0 0 -12 47 28 13 11 45 6 263 -56 -13 10 13 -12 24 48 -13 47 39 -11 47 44 152 0 0 -12 37 32 13 11 46 5 263 -56 -13 0 16 -12 14 53 -13 37 41 -11 37 51 153 0 0 -12 27 49 13 11 46 4 262 -57 -12 50 32 -12 5 10 -13 27 55 -11 28 9 154 0 0 -12 18 18 13 11 47 3 262 -57 -12 41 0 -11 55 40 -13 18 22 -11 18 41 155 0 0 -12 9 0 13 11 47 2 262 -57 -12 31 41 -11 46 23 -13 9 2 -11 9 25 156 0 0 -11 59 55 13 11 47 1 262 -57 -12 22 35 -11 37 18 -12 59 55 -11 0 22 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 5788-00725-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 42 34.8107 DE: -08 22 01.608 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 10.2 * B mag [mag]: 11.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1167) Dubiago approx. diameter [km]: 76 approx. diameter ["]: .033 distance from Earth [AU]: 3.18500 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1166 number of rejected observations: 56 time covered by the observations: 1930 Oct 19 - 2012 Oct 29 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.013, 72° remarks: * orbital elements for (1167) Dubiago : Mean anomaly = 43.24879141 deg Arg. of pericenter = 69.14893966 deg Long. of node = 223.90847193 deg Inclination = 5.72332095 deg Eccentricity = 0.07628312 Semimajor axis = 3.40806227 AU Perihelion dist = 3.14808464 AU Mag: H = 9.59, G = 0.15 Epoch of elements : MJD 56254.54600000 TDT (2012 Nov 23.546) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 23 1167 Dubiago 13h 7.0m UT 10.2 21 42 34.811- 8 22 1.61TYC 5788-00725-1 11.5 15.8 76 3.7 3.185 2.102 5.93 65.9931 -8.369 -20.10 -20.49 13.1162 0.07214 -0.37904 11.29847 2.14636 0.00559 0.00202 2000 42.53664020121119.00000 69.148940223.908472 5.7233210.07628312 3.4080623 3.1480846 9.9 5.00.15 RATE 1.5665440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.027 82 1.82 0.027 0 0-3 2 056247.0020121123_0725-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org