IOTA/IOTA-ES occultation update for (1172) Aneas / TYC 6752-00301-1 event on 2008 Feb 03, 05:34 UT Visible from W Africa Summary ------- On 2008 Feb 03 UT, the 143 km diameter asteroid (1172) Aneas will occult a 10.4 mag star in the constellation Hydra for observers along a path across W Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 16.1 mag (the magnitude of the asteroid) for at most 8.7 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: 72 * date and approx. time of event: 2008 Feb 03, 05:29 - 2008 Feb 03, 05:40 UT * midpoint of event [JD]: 2454499.7325375 * magnitude of target star: 10.4 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 8.7 * Moon: 15 % sunlit, 38° distance * Sun: 84° distance * rough path description: W Africa The occultation path -------------------- * approximate projected width [km]: 175 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 10.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .029", 90° ) * approx speed of asteroid's shadow [km/s]: 16.4398 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6752-00301-1 by 1172 Aneas on 2008 Feb 03 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 - 50 0 0 .. .. .. .. .. .. .. .. .. 46 11 17 .. .. .. .. .. .. .. .. .. - 49 0 0 46 38 0 5 29 35 0 129 -51 45 37 41 .. .. .. .. .. .. .. .. .. - 48 0 0 46 4 1 5 29 35 1 130 -51 45 3 36 47 5 24 .. .. .. .. .. .. - 47 0 0 45 29 33 5 29 35 2 131 -51 44 29 4 46 31 1 .. .. .. 48 12 52 - 46 0 0 44 54 38 5 29 36 3 132 -51 43 54 5 45 56 10 .. .. .. 47 38 7 - 45 0 0 44 19 16 5 29 36 4 132 -50 43 18 41 45 20 51 .. .. .. 47 2 54 - 44 0 0 43 43 29 5 29 37 5 133 -50 42 42 51 44 45 7 .. .. .. 46 27 14 - 43 0 0 43 7 18 5 29 37 6 134 -50 42 6 38 44 8 57 .. .. .. 45 51 6 - 42 0 0 42 30 42 5 29 38 7 134 -49 41 30 2 43 32 22 39 53 40 45 14 34 - 41 0 0 41 53 45 5 29 39 8 135 -49 40 53 4 42 55 25 39 16 41 44 37 36 - 40 0 0 41 16 26 5 29 40 9 136 -49 40 15 45 42 18 5 38 39 23 44 0 16 - 39 0 0 40 38 46 5 29 42 10 136 -48 39 38 7 41 40 25 38 1 47 43 22 33 - 38 0 0 40 0 48 5 29 43 11 137 -48 39 0 11 41 2 25 37 23 54 42 44 29 - 37 0 0 39 22 33 5 29 45 12 138 -47 38 21 58 40 24 6 36 45 44 42 6 6 - 36 0 0 38 44 1 5 29 47 13 138 -47 37 43 29 39 45 31 36 7 21 41 27 24 - 35 0 0 38 5 14 5 29 49 14 139 -46 37 4 47 39 6 40 35 28 44 40 48 26 - 34 0 0 37 26 15 5 29 51 15 140 -45 36 25 52 38 27 35 34 49 56 40 9 13 - 33 0 0 36 47 3 5 29 53 16 140 -45 35 46 45 37 48 18 34 10 58 39 29 45 - 32 0 0 36 7 41 5 29 55 17 141 -44 35 7 29 37 8 50 33 31 51 38 50 6 - 31 0 0 35 28 10 5 29 58 18 142 -43 34 28 5 36 29 12 32 52 37 38 10 16 - 30 0 0 34 48 32 5 30 1 19 142 -43 33 48 34 35 49 26 32 13 17 37 30 17 - 29 0 0 34 8 49 5 30 4 20 143 -42 33 8 59 35 9 35 31 33 53 36 50 11 - 28 0 0 33 29 1 5 30 7 21 144 -41 32 29 20 34 29 38 30 54 27 36 9 59 - 27 0 0 32 49 11 5 30 10 22 144 -41 31 49 39 33 49 39 30 15 0 35 29 44 - 26 0 0 32 9 21 5 30 13 23 145 -40 31 9 58 33 9 39 29 35 34 34 49 26 - 25 0 0 31 29 32 5 30 17 24 146 -39 30 30 19 32 29 39 28 56 10 34 9 8 - 24 0 0 30 49 45 5 30 21 25 146 -38 29 50 43 31 49 41 28 16 50 33 28 51 - 23 0 0 30 10 3 5 30 25 26 147 -37 29 11 11 31 9 47 27 37 35 32 48 37 - 22 0 0 29 30 26 5 30 29 27 148 -36 28 31 46 30 29 59 26 58 28 32 8 28 - 21 0 0 28 50 57 5 30 33 28 148 -35 27 52 29 29 50 17 26 19 29 31 28 25 - 20 0 0 28 11 38 5 30 37 29 149 -35 27 13 22 29 10 45 25 40 40 30 48 31 - 19 0 0 27 32 29 5 30 42 30 150 -34 26 34 25 28 31 23 25 2 3 30 8 46 - 18 0 0 26 53 32 5 30 47 31 151 -33 25 55 42 27 52 13 24 23 40 29 29 13 - 17 0 0 26 14 49 5 30 51 32 151 -32 25 17 12 27 13 16 23 45 31 28 49 52 - 16 0 0 25 36 22 5 30 56 33 152 -31 24 38 59 26 34 35 23 7 38 28 10 47 - 15 0 0 24 58 12 5 31 2 34 153 -30 24 1 2 25 56 10 22 30 2 27 31 57 - 14 0 0 24 20 20 5 31 7 35 154 -29 23 23 24 25 18 4 21 52 46 26 53 26 - 13 0 0 23 42 48 5 31 12 36 155 -28 22 46 6 24 40 17 21 15 50 26 15 13 - 12 0 0 23 5 37 5 31 18 37 155 -27 22 9 9 24 2 51 20 39 15 25 37 22 - 11 0 0 22 28 48 5 31 24 38 156 -26 21 32 35 23 25 47 20 3 3 24 59 52 - 10 0 0 21 52 23 5 31 29 39 157 -25 20 56 25 22 49 7 19 27 15 24 22 46 - 9 0 0 21 16 23 5 31 35 40 158 -24 20 20 40 22 12 52 18 51 53 23 46 4 - 8 0 0 20 40 49 5 31 41 41 159 -23 19 45 21 21 37 2 18 16 57 23 9 49 - 7 0 0 20 5 43 5 31 48 42 160 -22 19 10 29 21 1 40 17 42 28 22 34 1 - 6 0 0 19 31 5 5 31 54 43 161 -21 18 36 6 20 26 47 17 8 27 21 58 41 - 5 0 0 18 56 56 5 32 0 43 162 -20 18 2 12 19 52 23 16 34 57 21 23 50 - 4 0 0 18 23 18 5 32 7 44 163 -18 17 28 48 19 18 29 16 1 56 20 49 30 - 3 0 0 17 50 11 5 32 13 45 164 -17 16 55 56 18 45 7 15 29 27 20 15 42 - 2 0 0 17 17 36 5 32 20 46 165 -16 16 23 36 18 12 17 14 57 30 19 42 26 - 1 0 0 16 45 35 5 32 26 47 167 -15 15 51 50 17 40 1 14 26 5 19 9 44 0 0 0 16 14 7 5 32 33 47 168 -14 15 20 37 17 8 18 13 55 15 18 37 36 1 0 0 15 43 15 5 32 40 48 169 -13 14 49 58 16 37 11 13 24 59 18 6 3 2 0 0 15 12 57 5 32 47 49 170 -12 14 19 55 16 6 39 12 55 18 17 35 6 3 0 0 14 43 16 5 32 54 49 172 -11 13 50 28 15 36 43 12 26 12 17 4 45 4 0 0 14 14 12 5 33 1 50 173 -10 13 21 38 15 7 24 11 57 43 16 35 2 5 0 0 13 45 45 5 33 8 50 174 -9 12 53 24 14 38 43 11 29 51 16 5 57 6 0 0 13 17 55 5 33 15 51 176 -8 12 25 48 14 10 39 11 2 36 15 37 30 7 0 0 12 50 44 5 33 22 52 177 -7 11 58 51 13 43 15 10 35 59 15 9 42 8 0 0 12 24 12 5 33 29 52 179 -5 11 32 32 13 16 29 10 10 1 14 42 33 9 0 0 11 58 20 5 33 36 52 180 -4 11 6 52 12 50 23 9 44 40 14 16 5 10 0 0 11 33 6 5 33 44 53 182 -3 10 41 51 12 24 57 9 19 59 13 50 17 11 0 0 11 8 33 5 33 51 53 183 -2 10 17 30 12 0 11 8 55 58 13 25 9 12 0 0 10 44 40 5 33 58 54 185 -1 9 53 49 11 36 6 8 32 36 13 0 43 13 0 0 10 21 28 5 34 5 54 186 0 9 30 49 11 12 42 8 9 54 12 36 58 14 0 0 9 58 57 5 34 13 54 188 1 9 8 29 10 49 59 7 47 52 12 13 55 15 0 0 9 37 7 5 34 20 54 190 2 8 46 50 10 27 57 7 26 30 11 51 34 16 0 0 9 15 58 5 34 27 54 191 3 8 25 53 10 6 37 7 5 49 11 29 55 17 0 0 8 55 31 5 34 34 55 193 4 8 5 36 9 45 59 6 45 49 11 8 59 18 0 0 8 35 46 5 34 42 55 195 5 7 46 1 9 26 4 6 26 30 10 48 45 19 0 0 8 16 43 5 34 49 55 196 6 7 27 8 9 6 50 6 7 52 10 29 14 20 0 0 7 58 21 5 34 56 55 198 7 7 8 56 8 48 19 5 49 55 10 10 26 21 0 0 7 40 42 5 35 3 55 200 9 6 51 26 8 30 30 5 32 40 9 52 21 22 0 0 7 23 45 5 35 10 55 201 10 6 34 38 8 13 24 5 16 6 9 35 0 23 0 0 7 7 31 5 35 17 54 203 11 6 18 32 7 57 0 5 0 13 9 18 21 24 0 0 6 51 58 5 35 25 54 204 12 6 3 8 7 41 20 4 45 2 9 2 26 25 0 0 6 37 9 5 35 32 54 206 13 5 48 26 7 26 22 4 30 32 8 47 15 26 0 0 6 23 1 5 35 39 54 207 14 5 34 26 7 12 7 4 16 44 8 32 46 27 0 0 6 9 36 5 35 46 53 209 15 5 21 9 6 58 34 4 3 38 8 19 2 28 0 0 5 56 54 5 35 53 53 210 16 5 8 33 6 45 45 3 51 13 8 6 1 29 0 0 5 44 55 5 36 0 53 212 17 4 56 40 6 33 39 3 39 30 7 53 43 30 0 0 5 33 37 5 36 6 52 213 18 4 45 29 6 22 15 3 28 28 7 42 9 31 0 0 5 23 3 5 36 13 52 214 19 4 35 0 6 11 35 3 18 8 7 31 18 32 0 0 5 13 11 5 36 20 52 216 20 4 25 13 6 1 37 3 8 30 7 21 11 33 0 0 5 4 1 5 36 27 51 217 21 4 16 9 5 52 22 2 59 34 7 11 48 34 0 0 4 55 34 5 36 33 51 218 22 4 7 46 5 43 50 2 51 18 7 3 8 35 0 0 4 47 49 5 36 40 50 219 23 4 0 6 5 36 1 2 43 45 6 55 11 36 0 0 4 40 47 5 36 46 49 220 24 3 53 8 5 28 55 2 36 53 6 47 58 37 0 0 4 34 27 5 36 53 49 221 25 3 46 52 5 22 32 2 30 42 6 41 28 38 0 0 4 28 50 5 36 59 48 222 26 3 41 17 5 16 51 2 25 13 6 35 42 39 0 0 4 23 55 5 37 6 48 223 27 3 36 25 5 11 53 2 20 25 6 30 39 40 0 0 4 19 42 5 37 12 47 224 28 3 32 15 5 7 38 2 16 19 6 26 20 41 0 0 4 16 12 5 37 18 46 225 29 3 28 46 5 4 5 2 12 54 6 22 43 42 0 0 4 13 23 5 37 24 46 226 30 3 26 0 5 1 15 2 10 10 6 19 50 43 0 0 4 11 17 5 37 30 45 227 31 3 23 55 4 59 7 2 8 7 6 17 40 44 0 0 4 9 53 5 37 36 44 228 32 3 22 32 4 57 42 2 6 46 6 16 13 45 0 0 4 9 11 5 37 42 43 228 33 3 21 51 4 57 0 2 6 6 6 15 30 46 0 0 4 9 12 5 37 48 43 229 34 3 21 51 4 57 0 2 6 6 6 15 29 47 0 0 4 9 54 5 37 53 42 230 35 3 22 34 4 57 42 2 6 48 6 16 11 48 0 0 4 11 18 5 37 59 41 230 36 3 23 57 4 59 6 2 8 11 6 17 36 49 0 0 4 13 24 5 38 4 40 231 36 3 26 2 5 1 13 2 10 15 6 19 45 50 0 0 4 16 12 5 38 10 39 232 37 3 28 49 5 4 2 2 13 0 6 22 36 51 0 0 4 19 41 5 38 15 39 232 38 3 32 17 5 7 34 2 16 26 6 26 10 52 0 0 4 23 53 5 38 20 38 233 39 3 36 27 5 11 47 2 20 33 6 30 26 53 0 0 4 28 46 5 38 26 37 233 40 3 41 18 5 16 42 2 25 20 6 35 26 54 0 0 4 34 21 5 38 31 36 234 41 3 46 50 5 22 20 2 30 49 6 41 8 55 0 0 4 40 38 5 38 36 35 234 42 3 53 4 5 28 40 2 36 58 6 47 32 56 0 0 4 47 36 5 38 40 34 234 43 3 59 59 5 35 41 2 43 47 6 54 39 57 0 0 4 55 15 5 38 45 33 235 43 4 7 35 5 43 24 2 51 17 7 2 29 58 0 0 5 3 36 5 38 50 32 235 44 4 15 52 5 51 50 2 59 28 7 11 1 59 0 0 5 12 39 5 38 54 31 236 45 4 24 50 6 0 57 3 8 20 7 20 16 60 0 0 5 22 23 5 38 59 30 236 46 4 34 29 6 10 45 3 17 52 7 30 12 61 0 0 5 32 48 5 39 3 30 236 47 4 44 49 6 21 16 3 28 4 7 40 51 62 0 0 5 43 54 5 39 7 29 237 47 4 55 50 6 32 27 3 38 56 7 52 12 63 0 0 5 55 42 5 39 11 28 237 48 5 7 32 6 44 21 3 50 29 8 4 16 64 0 0 6 8 10 5 39 15 27 237 49 5 19 54 6 56 55 4 2 42 8 17 1 65 0 0 6 21 19 5 39 19 26 238 50 5 32 57 7 10 11 4 15 35 8 30 28 66 0 0 6 35 10 5 39 22 25 238 50 5 46 41 7 24 8 4 29 8 8 44 37 67 0 0 6 49 41 5 39 26 24 238 51 6 1 5 7 38 47 4 43 21 8 59 27 68 0 0 7 4 52 5 39 29 23 238 52 6 16 9 7 54 6 4 58 14 9 14 59 69 0 0 7 20 44 5 39 33 22 239 52 6 31 54 8 10 6 5 13 47 9 31 12 70 0 0 7 37 17 5 39 36 21 239 53 6 48 18 8 26 46 5 29 59 9 48 7 71 0 0 7 54 30 5 39 39 20 239 53 7 5 22 8 44 8 5 46 50 10 5 42 72 0 0 8 12 22 5 39 42 19 239 54 7 23 6 9 2 9 6 4 21 10 23 59 73 0 0 8 30 55 5 39 44 18 240 54 7 41 30 9 20 51 6 22 31 10 42 56 74 0 0 8 50 7 5 39 47 17 240 55 8 0 33 9 40 13 6 41 19 11 2 34 75 0 0 9 9 59 5 39 49 16 240 55 8 20 15 10 0 14 7 0 47 11 22 52 76 0 0 9 30 29 5 39 52 15 240 56 8 40 36 10 20 55 7 20 53 11 43 50 77 0 0 9 51 39 5 39 54 14 240 56 9 1 36 10 42 15 7 41 37 12 5 27 78 0 0 10 13 28 5 39 56 13 241 56 9 23 15 11 4 14 8 2 59 12 27 45 79 0 0 10 35 55 5 39 58 12 241 57 9 45 31 11 26 52 8 24 59 12 50 41 80 0 0 10 59 0 5 39 59 10 241 57 10 8 25 11 50 9 8 47 36 13 14 17 81 0 0 11 22 43 5 40 1 9 241 57 10 31 57 12 14 3 9 10 51 13 38 30 82 0 0 11 47 4 5 40 2 8 242 57 10 56 6 12 38 35 9 34 43 14 3 22 83 0 0 12 12 1 5 40 3 7 242 57 11 20 52 13 3 45 .. .. .. 14 28 52 84 0 0 12 37 35 5 40 4 6 242 57 11 46 15 13 29 31 .. .. .. 14 54 59 85 0 0 13 3 46 5 40 5 5 242 57 12 12 13 13 55 54 .. .. .. 15 21 43 86 0 0 13 30 32 5 40 6 4 242 57 12 38 47 14 22 53 .. .. .. 15 49 4 87 0 0 13 57 54 5 40 6 3 243 57 13 5 56 14 50 27 .. .. .. 16 17 0 88 0 0 14 25 50 5 40 7 2 243 57 13 33 40 15 18 37 .. .. .. 16 45 32 89 0 0 14 54 21 5 40 7 1 243 57 .. .. .. 15 47 21 .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 6752-00301-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 00 01.3062 DE: -25 36 01.234 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 11.3 * Apparent position with proper motion RA(deg): 225.1261632893 DE(deg): -25.6334796214 * Equation of equinoxes (radians) : 0.000045197732589 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1172) Aneas approx. diameter [km]: 143 approx. diameter ["]: .039 distance from Earth [AU]: 5.05000 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 768 number of rejected observations: 38 time covered by the observations: 1930 Oct 17 - 2007 Aug 09 1 sigma uncertainty ellipse (major, minor, PA): 0.047, 0.019, 90° remarks: * orbital elements for (1172) Aneas : Mean anomaly = 292.26214600 deg Arg. of pericenter = 49.36782488 deg Long. of node = 247.39272647 deg Inclination = 16.68350386 deg Eccentricity = 0.10390643 Semimajor axis = 5.19269692 AU Perihelion dist = 4.65314234 AU Mag: H = 8.08, G = 0.15 Epoch of elements : MJD 54499.23300000 TDT (2008 Feb 03.233) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 03 1172 Aneas 5h 34.9m UT 10.4 15 0 1.306-25 36 1.23TYC 6752-00301-1 11.3 16.1 143 8.7 5.050 1.133 -5.10 8.506 -25.599 99.72 -16.70 5.5809 .18410 .54808 8.80356 -2.93238 -0.00591 0.00165 2000 291.4930902008 125.00000 49.367825247.392726 16.6835040.103906435.192696924.653142348.335 0.15 RATE .8329420 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.052 0.029 90.0 1.810 0.032 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 04, 01:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org