IOTA/IOTA-ES occultation update for (19) Fortuna / TYC 6293-02458-1 event on 2008 Nov 03, 10:51 UT Visible from E Australia Summary ------- On 2008 Nov 03 UT, the 221 km diameter asteroid (19) Fortuna will occult a 12.5 mag star in the constellation Sagittarius 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 0.7 mag to 12.3 mag (the magnitude of the asteroid) for at most 7.0 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: 98 * date and approx. time of event: 2008 Nov 03, 10:52 - 2008 Nov 03, 10:54 UT * midpoint of event [JD]: 2454773.95215833 * magnitude of target star: 12.5 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 7.0 * Moon: 25 % sunlit, 5° distance * Sun: 62° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 237 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .038", 360° ) * approx speed of asteroid's shadow [km/s]: 31.5812 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6293-02458-1 by 19 Fortuna on 2008 Nov 3 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 115 0 0 -36 45 23 10 52 39 54 285 0 -37 53 2 -35 38 16 -38 39 21 -34 52 54 116 0 0 -36 29 39 10 52 42 54 283 -1 -37 37 25 -35 22 26 -38 23 49 -34 37 0 117 0 0 -36 13 37 10 52 45 53 282 -2 -37 21 29 -35 6 17 -38 7 57 -34 20 46 118 0 0 -35 57 16 10 52 47 52 281 -3 -37 5 15 -34 49 49 -37 51 48 -34 4 15 119 0 0 -35 40 37 10 52 50 51 280 -4 -36 48 42 -34 33 4 -37 35 19 -33 47 25 120 0 0 -35 23 39 10 52 52 51 279 -5 -36 31 51 -34 16 0 -37 18 33 -33 30 17 121 0 0 -35 6 24 10 52 55 50 278 -6 -36 14 42 -33 58 38 -37 1 29 -33 12 51 122 0 0 -34 48 51 10 52 57 49 277 -7 -35 57 15 -33 40 59 -36 44 7 -32 55 7 123 0 0 -34 31 0 10 53 0 48 276 -7 -35 39 31 -33 23 2 -36 26 27 -32 37 6 124 0 0 -34 12 52 10 53 2 47 275 -8 -35 21 29 -33 4 47 -36 8 29 -32 18 47 125 0 0 -33 54 26 10 53 5 47 274 -9 -35 3 10 -32 46 16 -35 50 14 -32 0 12 126 0 0 -33 35 44 10 53 7 46 273 -10 -34 44 33 -32 27 27 -35 31 42 -31 41 19 127 0 0 -33 16 44 10 53 10 45 272 -11 -34 25 40 -32 8 22 -35 12 53 -31 22 10 128 0 0 -32 57 28 10 53 12 44 271 -12 -34 6 30 -31 49 0 -34 53 47 -31 2 45 129 0 0 -32 37 56 10 53 14 43 270 -13 -33 47 4 -31 29 23 -34 34 24 -30 43 3 130 0 0 -32 18 8 10 53 17 42 269 -14 -33 27 21 -31 9 29 -34 14 46 -30 23 6 131 0 0 -31 58 4 10 53 19 42 269 -15 -33 7 23 -30 49 19 -33 54 51 -30 2 53 132 0 0 -31 37 45 10 53 21 41 268 -15 -32 47 9 -30 28 55 -33 34 41 -29 42 25 133 0 0 -31 17 10 10 53 24 40 267 -16 -32 26 39 -30 8 15 -33 14 15 -29 21 42 134 0 0 -30 56 21 10 53 26 39 266 -17 -32 5 55 -29 47 21 -32 53 34 -29 0 44 135 0 0 -30 35 17 10 53 28 38 266 -18 -31 44 56 -29 26 13 -32 32 39 -28 39 33 136 0 0 -30 13 59 10 53 30 37 265 -19 -31 23 43 -29 4 50 -32 11 29 -28 18 7 137 0 0 -29 52 28 10 53 32 36 264 -20 -31 2 16 -28 43 14 -31 50 5 -27 56 28 138 0 0 -29 30 43 10 53 34 35 263 -21 -30 40 35 -28 21 25 -31 28 28 -27 34 36 139 0 0 -29 8 45 10 53 37 34 263 -22 -30 18 42 -27 59 23 -31 6 37 -27 12 32 140 0 0 -28 46 35 10 53 39 33 262 -23 -29 56 35 -27 37 9 -30 44 33 -26 50 15 141 0 0 -28 24 12 10 53 41 33 261 -24 -29 34 17 -27 14 43 -30 22 17 -26 27 47 142 0 0 -28 1 38 10 53 42 32 261 -25 -29 11 46 -26 52 6 -29 59 49 -26 5 7 143 0 0 -27 38 53 10 53 44 31 260 -26 -28 49 4 -26 29 17 -29 37 9 -25 42 17 144 0 0 -27 15 57 10 53 46 30 260 -27 -28 26 11 -26 6 19 -29 14 18 -25 19 16 145 0 0 -26 52 51 10 53 48 29 259 -28 -28 3 8 -25 43 10 -28 51 17 -24 56 6 146 0 0 -26 29 35 10 53 50 28 258 -29 -27 39 55 -25 19 52 -28 28 5 -24 32 46 147 0 0 -26 6 10 10 53 51 27 258 -30 -27 16 32 -24 56 24 -28 4 44 -24 9 17 148 0 0 -25 42 37 10 53 53 26 257 -31 -26 53 0 -24 32 49 -27 41 14 -23 45 40 149 0 0 -25 18 55 10 53 55 25 257 -31 -26 29 20 -24 9 5 -27 17 35 -23 21 56 150 0 0 -24 55 6 10 53 56 24 256 -32 -26 5 32 -23 45 14 -26 53 49 -22 58 4 151 0 0 -24 31 9 10 53 58 23 256 -33 -25 41 37 -23 21 17 -26 29 54 -22 34 5 152 0 0 -24 7 6 10 53 59 22 255 -34 -25 17 36 -22 57 13 -26 5 53 -22 10 1 153 0 0 -23 42 58 10 54 1 21 255 -35 -24 53 28 -22 33 4 -25 41 46 -21 45 51 154 0 0 -23 18 44 10 54 2 20 255 -36 -24 29 14 -22 8 49 -25 17 33 -21 21 36 155 0 0 -22 54 25 10 54 3 19 254 -37 -24 4 56 -21 44 30 -24 53 14 -20 57 17 156 0 0 -22 30 2 10 54 4 18 254 -38 -23 40 33 -21 20 8 -24 28 52 -20 32 55 157 0 0 -22 5 36 10 54 6 17 253 -39 -23 16 6 -20 55 42 -24 4 25 -20 8 29 158 0 0 -21 41 7 10 54 7 16 253 -40 -22 51 37 -20 31 13 -23 39 55 -19 44 1 159 0 0 -21 16 35 10 54 8 15 252 -41 -22 27 4 -20 6 43 -23 15 22 -19 19 31 160 0 0 -20 52 2 10 54 9 14 252 -42 -22 2 30 -19 42 11 -22 50 47 -18 55 0 161 0 0 -20 27 29 10 54 10 13 252 -43 -21 37 55 -19 17 38 -22 26 11 -18 30 28 162 0 0 -20 2 54 10 54 10 12 251 -44 -21 13 19 -18 53 5 -22 1 34 -18 5 56 163 0 0 -19 38 20 10 54 11 11 251 -45 -20 48 43 -18 28 33 -21 36 57 -17 41 25 164 0 0 -19 13 47 10 54 12 10 251 -46 -20 24 8 -18 4 2 -21 12 20 -17 16 55 165 0 0 -18 49 15 10 54 13 9 250 -47 -19 59 34 -17 39 32 -20 47 44 -16 52 27 166 0 0 -18 24 46 10 54 13 8 250 -48 -19 35 2 -17 15 5 -20 23 10 -16 28 2 167 0 0 -18 0 19 10 54 14 7 250 -48 -19 10 32 -16 50 41 -19 58 39 -16 3 40 168 0 0 -17 35 56 10 54 14 6 249 -49 -18 46 6 -16 26 21 -19 34 10 -15 39 21 169 0 0 -17 11 36 10 54 14 5 249 -50 -18 21 43 -16 2 5 -19 9 46 -15 15 7 170 0 0 -16 47 22 10 54 15 4 249 -51 -17 57 25 -15 37 54 -18 45 25 -14 50 59 171 0 0 -16 23 12 10 54 15 3 248 -52 -17 33 12 -15 13 48 -18 21 10 -14 26 55 172 0 0 -15 59 9 10 54 15 2 248 -53 -17 9 5 -14 49 48 -17 57 0 -14 2 58 173 0 0 -15 35 12 10 54 15 0 248 -54 -16 45 4 -14 25 55 -17 32 56 .. .. .. Uncertainty in time = +/- 2 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 6293-02458-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 55 16.2109 DE: -21 26 02.179 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .038, .039 ) * V mag [mag]: 12.5 * B mag [mag]: 12.4 * Apparent position with proper motion RA(deg): 283.9499220669 DE(deg): -21.4237130293 * Equation of equinoxes (radians) : 0.000047970466806 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (19) Fortuna approx. diameter [km]: 221 approx. diameter ["]: .114 distance from Earth [AU]: 2.68000 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1624 number of rejected observations: 259 time covered by the observations: 1900 Feb 12 - 2008 Aug 23 1 sigma uncertainty ellipse (major, minor, PA): 0.006, 0.005, 84° remarks: * orbital elements for (19) Fortuna : Mean anomaly = 289.24697104 deg Arg. of pericenter = 181.86011863 deg Long. of node = 211.28973109 deg Inclination = 1.57210402 deg Eccentricity = 0.15800863 Semimajor axis = 2.44332838 AU Perihelion dist = 2.05726142 AU Mag: H = 7.14, G = 0.10 Epoch of elements : MJD 54773.45200000 TDT (2008 Nov 03.452) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Nov 3 19 Fortuna 10h 51.1m UT 12.5 18 55 16.211-21 26 2.18TYC 6293-02458-1 12.4 12.3 221 7.0 2.680 4.177 4.63 77.9685 -21.436 13.12 -15.25 10.8518 0.02777 -0.35724 17.76950 1.40963 0.00496 0.00054 2000 288.35612620081031.00000181.860119211.289731 1.5721040.15800863 2.4433284 2.0572614 7.1 5.00.10 RATE 2.5806630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.038 360 1.34 0.039 0 54740.5020081103_2458-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 23:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org