IOTA/IOTA-ES occultation update for (416) Vaticana / TYC 7381-00715-1 event on 2008 Oct 04, 11:28 UT Visible from Australia Summary ------- On 2008 Oct 04 UT, the 86 km diameter asteroid (416) Vaticana will occult a 11.0 mag star in the constellation Scorpius 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 1.8 mag to 12.6 mag (the magnitude of the asteroid) for at most 3.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 86 * date and approx. time of event: 2008 Oct 04, 11:29 - 2008 Oct 04, 11:32 UT * midpoint of event [JD]: 2454743.97805 * magnitude of target star: 11.0 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 3.0 * Moon: 24 % sunlit, 18° distance * Sun: 75° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.58 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 1° ) * approx speed of asteroid's shadow [km/s]: 28.0962 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7381-00715-1 by 416 Vaticana on 2008 Oct 4 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 99 0 0 -38 12 20 11 29 21 74 280 0 -38 36 4 -37 48 36 -39 3 38 -37 21 6 100 0 0 -38 3 36 11 29 24 73 279 -1 -38 27 23 -37 39 50 -38 55 0 -37 12 17 101 0 0 -37 54 23 11 29 27 73 277 -2 -38 18 13 -37 30 34 -38 45 53 -37 2 58 102 0 0 -37 44 41 11 29 30 72 276 -3 -38 8 33 -37 20 49 -38 36 16 -36 53 10 103 0 0 -37 34 28 11 29 33 71 274 -4 -37 58 24 -37 10 34 -38 26 10 -36 42 51 104 0 0 -37 23 46 11 29 37 70 273 -5 -37 47 45 -36 59 49 -38 15 35 -36 32 2 105 0 0 -37 12 34 11 29 40 69 272 -5 -37 36 36 -36 48 33 -38 4 30 -36 20 43 106 0 0 -37 0 52 11 29 43 69 271 -6 -37 24 57 -36 36 48 -37 52 55 -36 8 54 107 0 0 -36 48 39 11 29 46 68 270 -7 -37 12 48 -36 24 32 -37 40 49 -35 56 33 108 0 0 -36 35 56 11 29 49 67 268 -8 -37 0 8 -36 11 45 -37 28 14 -35 43 42 109 0 0 -36 22 42 11 29 52 66 267 -9 -36 46 58 -35 58 27 -37 15 8 -35 30 20 110 0 0 -36 8 57 11 29 55 65 266 -10 -36 33 17 -35 44 38 -37 1 31 -35 16 27 111 0 0 -35 54 41 11 29 58 65 265 -10 -36 19 4 -35 30 18 -36 47 24 -35 2 3 112 0 0 -35 39 54 11 30 1 64 265 -11 -36 4 21 -35 15 27 -36 32 45 -34 47 7 113 0 0 -35 24 35 11 30 4 63 264 -12 -35 49 6 -35 0 4 -36 17 35 -34 31 39 114 0 0 -35 8 44 11 30 7 62 263 -13 -35 33 20 -34 44 9 -36 1 54 -34 15 39 115 0 0 -34 52 22 11 30 11 61 262 -14 -35 17 2 -34 27 43 -35 45 41 -33 59 8 116 0 0 -34 35 28 11 30 14 60 261 -15 -35 0 13 -34 10 44 -35 28 56 -33 42 4 117 0 0 -34 18 1 11 30 17 59 260 -16 -34 42 51 -33 53 13 -35 11 40 -33 24 28 118 0 0 -34 0 2 11 30 20 59 259 -17 -34 24 56 -33 35 9 -34 53 51 -33 6 19 119 0 0 -33 41 31 11 30 23 58 259 -17 -34 6 30 -33 16 33 -34 35 30 -32 47 37 120 0 0 -33 22 27 11 30 26 57 258 -18 -33 47 31 -32 57 25 -34 16 36 -32 28 23 121 0 0 -33 2 50 11 30 29 56 257 -19 -33 27 59 -32 37 43 -33 57 10 -32 8 36 122 0 0 -32 42 41 11 30 32 55 256 -20 -33 7 54 -32 17 28 -33 37 11 -31 48 16 123 0 0 -32 21 58 11 30 35 54 256 -21 -32 47 16 -31 56 41 -33 16 39 -31 27 22 124 0 0 -32 0 42 11 30 38 53 255 -22 -32 26 6 -31 35 20 -32 55 34 -31 5 55 125 0 0 -31 38 53 11 30 41 52 254 -23 -32 4 21 -31 13 25 -32 33 56 -30 43 55 126 0 0 -31 16 30 11 30 44 51 254 -24 -31 42 4 -30 50 58 -32 11 45 -30 21 21 127 0 0 -30 53 34 11 30 47 50 253 -25 -31 19 13 -30 27 57 -31 49 0 -29 58 14 128 0 0 -30 30 5 11 30 49 49 252 -26 -30 55 49 -30 4 22 -31 25 42 -29 34 33 129 0 0 -30 6 2 11 30 52 49 252 -27 -30 31 52 -29 40 14 -31 1 51 -29 10 19 130 0 0 -29 41 26 11 30 55 48 251 -28 -30 7 21 -29 15 32 -30 37 26 -28 45 31 131 0 0 -29 16 16 11 30 58 47 250 -29 -29 42 16 -28 50 17 -30 12 28 -28 20 9 132 0 0 -28 50 32 11 31 1 46 250 -30 -29 16 38 -28 24 28 -29 46 56 -27 54 14 133 0 0 -28 24 15 11 31 4 45 249 -31 -28 50 27 -27 58 6 -29 20 51 -27 27 46 134 0 0 -27 57 25 11 31 6 44 249 -32 -28 23 42 -27 31 10 -28 54 12 -27 0 44 135 0 0 -27 30 2 11 31 9 43 248 -33 -27 56 24 -27 3 42 -28 27 1 -26 33 10 136 0 0 -27 2 6 11 31 12 42 248 -34 -27 28 33 -26 35 40 -27 59 16 -26 5 2 137 0 0 -26 33 37 11 31 15 41 247 -35 -27 0 9 -26 7 5 -27 30 58 -25 36 21 138 0 0 -26 4 35 11 31 17 40 246 -36 -26 31 13 -25 37 58 -27 2 8 -25 7 8 139 0 0 -25 35 1 11 31 20 39 246 -37 -26 1 44 -25 8 19 -26 32 45 -24 37 23 140 0 0 -25 4 54 11 31 22 38 245 -38 -25 31 43 -24 38 8 -26 2 50 -24 7 5 141 0 0 -24 34 16 11 31 25 36 245 -39 -25 1 10 -24 7 24 -25 32 23 -23 36 16 142 0 0 -24 3 7 11 31 27 35 245 -40 -24 30 5 -23 36 10 -25 1 25 -23 4 56 143 0 0 -23 31 26 11 31 30 34 244 -41 -23 58 30 -23 4 24 -24 29 55 -22 33 5 144 0 0 -22 59 16 11 31 32 33 244 -42 -23 26 24 -22 32 9 -23 57 55 -22 0 43 145 0 0 -22 26 35 11 31 35 32 243 -43 -22 53 48 -21 59 23 -23 25 24 -21 27 52 146 0 0 -21 53 24 11 31 37 31 243 -44 -22 20 42 -21 26 8 -22 52 24 -20 54 31 147 0 0 -21 19 45 11 31 39 30 242 -45 -21 47 7 -20 52 24 -22 18 54 -20 20 42 148 0 0 -20 45 37 11 31 41 29 242 -46 -21 13 4 -20 18 11 -21 44 56 -19 46 25 149 0 0 -20 11 1 11 31 43 28 242 -47 -20 38 33 -19 43 32 -21 10 30 -19 11 40 150 0 0 -19 35 59 11 31 45 27 241 -49 -20 3 35 -19 8 25 -20 35 37 -18 36 29 151 0 0 -19 0 31 11 31 47 26 241 -50 -19 28 10 -18 32 53 -20 0 17 -18 0 52 152 0 0 -18 24 37 11 31 49 24 241 -51 -18 52 20 -17 56 56 -19 24 32 -17 24 50 153 0 0 -17 48 19 11 31 51 23 240 -52 -18 16 6 -17 20 34 -18 48 22 -16 48 24 154 0 0 -17 11 37 11 31 53 22 240 -53 -17 39 28 -16 43 49 -18 11 48 -16 11 34 155 0 0 -16 34 33 11 31 54 21 240 -54 -17 2 27 -16 6 41 -17 34 51 -15 34 23 156 0 0 -15 57 7 11 31 56 20 239 -55 -16 25 4 -15 29 12 -16 57 32 -14 56 50 157 0 0 -15 19 21 11 31 58 19 239 -57 -15 47 21 -14 51 23 -16 19 52 -14 18 58 158 0 0 -14 41 15 11 31 59 18 239 -58 -15 9 18 -14 13 14 -15 41 52 -13 40 46 159 0 0 -14 2 51 11 32 0 16 238 -59 -14 30 56 -13 34 48 -15 3 34 -13 2 17 160 0 0 -13 24 10 11 32 2 15 238 -60 -13 52 17 -12 56 4 -14 24 57 -12 23 30 161 0 0 -12 45 13 11 32 3 14 238 -61 -13 13 22 -12 17 5 -13 46 5 -11 44 29 162 0 0 -12 6 1 11 32 4 13 238 -62 -12 34 12 -11 37 51 -13 6 57 -11 5 13 163 0 0 -11 26 35 11 32 5 12 238 -64 -11 54 48 -10 58 24 -12 27 35 -10 25 44 164 0 0 -10 46 58 11 32 6 11 237 -65 -11 15 12 -10 18 45 -11 48 0 - 9 46 3 165 0 0 -10 7 9 11 32 7 9 237 -66 -10 35 25 - 9 38 55 -11 8 14 - 9 6 12 166 0 0 - 9 27 11 11 32 7 8 237 -67 - 9 55 28 - 8 58 56 -10 28 19 - 8 26 12 167 0 0 - 8 47 5 11 32 8 7 237 -68 - 9 15 23 - 8 18 49 - 9 48 14 - 7 46 5 168 0 0 - 8 6 52 11 32 9 6 237 -70 - 8 35 10 - 7 38 36 - 9 8 2 - 7 5 51 169 0 0 - 7 26 34 11 32 9 5 237 -71 - 7 54 52 - 6 58 18 - 8 27 44 - 6 25 32 170 0 0 - 6 46 12 11 32 9 3 236 -72 - 7 14 30 - 6 17 56 - 7 47 22 - 5 45 10 171 0 0 - 6 5 47 11 32 10 2 236 -73 - 6 34 5 - 5 37 31 - 7 6 57 - 5 4 46 172 0 0 - 5 25 22 11 32 10 1 236 -74 - 5 53 39 - 4 57 6 - 6 26 30 - 4 24 21 Uncertainty in time = +/- 2 secs [Prediction of 2008 Aug 25.0] Data for the target star ------------------------ * name: TYC 7381-00715-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 44 15.2613 DE: -33 44 21.584 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .029 ) * V mag [mag]: 11.0 * B mag [mag]: 11.3 * Apparent position with proper motion RA(deg): 266.2099393908 DE(deg): -33.7455815256 * Equation of equinoxes (radians) : 0.000048980698517 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (416) Vaticana approx. diameter [km]: 86 approx. diameter ["]: .052 distance from Earth [AU]: 2.29100 * orbital information: orbit source: Preston date of fit: 2008 Aug 24 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 839 number of rejected observations: 101 time covered by the observations: 1900 Jan 26 - 2008 Aug 21 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 106° remarks: * orbital elements for (416) Vaticana : Mean anomaly = 23.09011610 deg Arg. of pericenter = 198.90473525 deg Long. of node = 58.19325691 deg Inclination = 12.85840892 deg Eccentricity = 0.21917380 Semimajor axis = 2.79215011 AU Perihelion dist = 2.18018397 AU Mag: H = 7.68, G = 0.20 Epoch of elements : MJD 54743.47800000 TDT (2008 Oct 04.478) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 4 416 Vaticana 11h 28.4m UT 11.0 17 44 15.261-33 44 21.58TYC 7381-00715-1 11.3 12.6 86 3.0 2.291 4.879 -0.28 80.4373 -33.739 5.05 -4.59 11.4732 -0.00178 -0.09620 15.85813 -0.07387 0.00532 -0.00040 2000 22.355390200810 1.00000198.904735 58.193257 12.8584090.21917380 2.7921501 2.1801840 7.9 5.00.20 RATE 2.1124960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.025 1 1.58 0.030 0 54703.5020081004_0715-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Aug 25, 04:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org