IOTA/IOTA-ES occultation update for (798) Ruth / TYC 5757-01349-1 event on 2012 Nov 14, 03:41 UT Visible from Canada Summary ------- On 2012 Nov 14 UT, the 45 km diameter asteroid (798) Ruth will occult a 11.0 mag star in the constellation Aquarius for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 15.2 mag (the magnitude of the asteroid) for at most 2.1 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: 43 * date and approx. time of event: 2012 Nov 14, 03:40 - 2012 Nov 14, 03:44 UT * geocentric midpoint of event [JD]: 2456245.65383333 * magnitude of target star: 11.0 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 2.1 * Moon: 0 % sunlit, 79° distance * Sun: 82° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 1.52 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .029", 359° ) * approx speed of asteroid's shadow [km/s]: 21.9368 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5757-01349-1 by 798 Ruth on 2012 Nov 14 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 -168 0 0 44 48 31 3 40 59 35 164 0 44 27 48 45 9 25 43 25 51 46 14 3 -167 0 0 44 50 40 3 41 3 35 166 -1 44 29 57 45 11 34 43 27 58 46 16 13 -166 0 0 44 53 2 3 41 6 35 167 -1 44 32 18 45 13 56 43 30 18 46 18 36 -165 0 0 44 55 36 3 41 10 36 168 -2 44 34 52 45 16 31 43 32 51 46 21 12 -164 0 0 44 58 23 3 41 14 36 169 -3 44 37 39 45 19 18 43 35 37 46 24 1 -163 0 0 45 1 23 3 41 17 36 170 -3 44 40 38 45 22 18 43 38 35 46 27 2 -162 0 0 45 4 35 3 41 21 36 172 -4 44 43 50 45 25 31 43 41 46 46 30 16 -161 0 0 45 8 0 3 41 25 36 173 -5 44 47 14 45 28 56 43 45 9 46 33 43 -160 0 0 45 11 37 3 41 28 36 174 -6 44 50 51 45 32 34 43 48 44 46 37 22 -159 0 0 45 15 27 3 41 32 36 175 -6 44 54 40 45 36 24 43 52 32 46 41 14 -158 0 0 45 19 29 3 41 36 36 177 -7 44 58 41 45 40 26 43 56 31 46 45 18 -157 0 0 45 23 42 3 41 39 36 178 -8 45 2 55 45 44 41 44 0 43 46 49 34 -156 0 0 45 28 8 3 41 43 36 179 -8 45 7 20 45 49 7 44 5 6 46 54 3 -155 0 0 45 32 46 3 41 46 36 180 -9 45 11 57 45 53 45 44 9 42 46 58 43 -154 0 0 45 37 35 3 41 50 36 182 -10 45 16 46 45 58 35 44 14 29 47 3 35 -153 0 0 45 42 36 3 41 54 36 183 -10 45 21 46 46 3 37 44 19 27 47 8 39 -152 0 0 45 47 49 3 41 57 35 184 -11 45 26 58 46 8 50 44 24 37 47 13 54 -151 0 0 45 53 13 3 42 1 35 185 -12 45 32 21 46 14 15 44 29 59 47 19 21 -150 0 0 45 58 48 3 42 4 35 187 -13 45 37 55 46 19 51 44 35 31 47 24 59 -149 0 0 46 4 34 3 42 8 35 188 -13 45 43 41 46 25 37 44 41 14 47 30 48 -148 0 0 46 10 31 3 42 11 35 189 -14 45 49 37 46 31 35 44 47 8 47 36 48 -147 0 0 46 16 38 3 42 15 34 190 -15 45 55 44 46 37 44 44 53 13 47 42 59 -146 0 0 46 22 57 3 42 18 34 191 -15 46 2 2 46 44 3 44 59 29 47 49 20 -145 0 0 46 29 25 3 42 22 34 193 -16 46 8 29 46 50 32 45 5 54 47 55 52 -144 0 0 46 36 4 3 42 25 34 194 -17 46 15 8 46 57 12 45 12 30 48 2 35 -143 0 0 46 42 53 3 42 29 33 195 -18 46 21 56 47 4 2 45 19 16 48 9 27 -142 0 0 46 49 52 3 42 32 33 196 -18 46 28 54 47 11 1 45 26 12 48 16 29 -141 0 0 46 57 0 3 42 35 33 197 -19 46 36 1 47 18 10 45 33 17 48 23 41 -140 0 0 47 4 18 3 42 39 32 198 -20 46 43 18 47 25 29 45 40 32 48 31 3 -139 0 0 47 11 46 3 42 42 32 199 -20 46 50 45 47 32 57 45 47 56 48 38 34 -138 0 0 47 19 22 3 42 45 32 201 -21 46 58 20 47 40 34 45 55 29 48 46 13 -137 0 0 47 27 7 3 42 48 31 202 -22 47 6 5 47 48 20 46 3 11 48 54 2 -136 0 0 47 35 1 3 42 51 31 203 -22 47 13 58 47 56 15 46 11 1 49 2 0 -135 0 0 47 43 3 3 42 54 31 204 -23 47 21 59 48 4 18 46 19 0 49 10 6 -134 0 0 47 51 14 3 42 57 30 205 -24 47 30 9 48 12 30 46 27 7 49 18 20 -133 0 0 47 59 32 3 43 0 30 206 -24 47 38 26 48 20 49 46 35 22 49 26 42 -132 0 0 48 7 58 3 43 3 29 207 -25 47 46 52 48 29 16 46 43 45 49 35 12 -131 0 0 48 16 32 3 43 6 29 208 -26 47 55 25 48 37 51 46 52 16 49 43 50 -130 0 0 48 25 14 3 43 9 29 209 -27 48 4 5 48 46 33 47 0 54 49 52 35 -129 0 0 48 34 2 3 43 12 28 210 -27 48 12 53 48 55 22 47 9 39 50 1 27 -128 0 0 48 42 57 3 43 15 28 211 -28 48 21 47 49 4 18 47 18 31 50 10 26 -127 0 0 48 51 59 3 43 17 27 212 -28 48 30 48 49 13 21 47 27 29 50 19 31 -126 0 0 49 1 7 3 43 20 27 213 -29 48 39 55 49 22 30 47 36 34 50 28 43 -125 0 0 49 10 22 3 43 23 26 214 -30 48 49 9 49 31 45 47 45 46 50 38 1 -124 0 0 49 19 42 3 43 25 26 215 -30 48 58 29 49 41 7 47 55 3 50 47 25 -123 0 0 49 29 8 3 43 28 25 216 -31 49 7 54 49 50 33 48 4 26 50 56 54 -122 0 0 49 38 39 3 43 30 25 217 -32 49 17 24 50 0 6 48 13 54 51 6 29 -121 0 0 49 48 16 3 43 33 24 218 -32 49 27 0 50 9 43 48 23 27 51 16 9 -120 0 0 49 57 57 3 43 35 24 219 -33 49 36 41 50 19 25 48 33 6 51 25 54 -119 0 0 50 7 44 3 43 37 23 220 -34 49 46 26 50 29 12 48 42 49 51 35 44 -118 0 0 50 17 34 3 43 40 22 221 -34 49 56 16 50 39 4 48 52 37 51 45 38 -117 0 0 50 27 29 3 43 42 22 222 -35 50 6 10 50 48 59 49 2 29 51 55 36 -116 0 0 50 37 28 3 43 44 21 223 -35 50 16 8 50 58 59 49 12 25 52 5 37 -115 0 0 50 47 30 3 43 46 21 224 -36 50 26 10 51 9 2 49 22 25 52 15 43 -114 0 0 50 57 36 3 43 48 20 225 -36 50 36 15 51 19 8 49 32 28 52 25 52 -113 0 0 51 7 45 3 43 50 20 226 -37 50 46 23 51 29 18 49 42 34 52 36 3 -112 0 0 51 17 57 3 43 52 19 226 -38 50 56 35 51 39 31 49 52 44 52 46 18 -111 0 0 51 28 11 3 43 54 18 227 -38 51 6 49 51 49 46 50 2 56 52 56 35 -110 0 0 51 38 28 3 43 55 18 228 -39 51 17 5 52 0 3 50 13 10 53 6 55 -109 0 0 51 48 47 3 43 57 17 229 -39 51 27 23 52 10 23 50 23 27 53 17 17 -108 0 0 51 59 9 3 43 59 17 230 -40 51 37 44 52 20 45 50 33 46 53 27 40 -107 0 0 52 9 31 3 44 0 16 231 -40 51 48 6 52 31 8 50 44 7 53 38 5 -106 0 0 52 19 55 3 44 2 16 232 -41 51 58 30 52 41 33 50 54 29 53 48 31 -105 0 0 52 30 21 3 44 3 15 233 -41 52 8 55 52 51 58 51 4 52 53 58 59 -104 0 0 52 40 47 3 44 5 14 233 -42 52 19 20 53 2 25 51 15 17 54 9 27 -103 0 0 52 51 14 3 44 6 14 234 -42 52 29 47 53 12 52 51 25 42 54 19 56 -102 0 0 53 1 41 3 44 7 13 235 -42 52 40 14 53 23 20 51 36 8 54 30 25 -101 0 0 53 12 9 3 44 8 13 236 -43 52 50 41 53 33 48 51 46 34 54 40 54 -100 0 0 53 22 36 3 44 9 12 237 -43 53 1 8 53 44 16 51 57 0 54 51 23 - 99 0 0 53 33 3 3 44 11 11 238 -44 53 11 35 53 54 44 52 7 26 55 1 51 - 98 0 0 53 43 30 3 44 12 11 239 -44 53 22 2 54 5 11 52 17 52 55 12 19 - 97 0 0 53 53 56 3 44 13 10 239 -44 53 32 27 54 15 37 52 28 17 55 22 47 - 96 0 0 54 4 21 3 44 14 10 240 -45 53 42 52 54 26 2 52 38 42 55 33 13 - 95 0 0 54 14 45 3 44 14 9 241 -45 53 53 16 54 36 26 52 49 5 55 43 37 - 94 0 0 54 25 8 3 44 15 8 242 -45 54 3 38 54 46 49 52 59 27 55 54 1 - 93 0 0 54 35 29 3 44 16 8 243 -46 54 13 59 54 57 10 53 9 47 56 4 22 - 92 0 0 54 45 48 3 44 17 7 244 -46 54 24 18 55 7 29 53 20 6 56 14 42 - 91 0 0 54 56 5 3 44 17 7 244 -46 54 34 35 55 17 47 53 30 23 56 24 59 - 90 0 0 55 6 20 3 44 18 6 245 -47 54 44 50 55 28 2 53 40 38 56 35 14 - 89 0 0 55 16 33 3 44 18 5 246 -47 54 55 3 55 38 14 .. .. .. 56 45 27 - 88 0 0 55 26 42 3 44 19 5 247 -47 55 5 13 55 48 24 .. .. .. 56 55 36 - 87 0 0 55 36 49 3 44 19 4 248 -47 55 15 20 55 58 31 .. .. .. 57 5 43 - 86 0 0 55 46 53 3 44 19 4 249 -48 55 25 24 56 8 35 .. .. .. 57 15 47 - 85 0 0 55 56 54 3 44 20 3 249 -48 55 35 25 56 18 35 .. .. .. 57 25 47 - 84 0 0 56 6 52 3 44 20 2 250 -48 55 45 22 56 28 33 .. .. .. 57 35 44 - 83 0 0 56 16 46 3 44 20 2 251 -48 55 55 17 56 38 26 .. .. .. 57 45 37 - 82 0 0 56 26 36 3 44 20 1 252 -48 56 5 7 56 48 16 .. .. .. 57 55 26 - 81 0 0 56 36 22 3 44 20 1 253 -49 56 14 53 56 58 2 .. .. .. 58 5 11 - 80 0 0 56 46 4 3 44 20 0 254 -49 56 24 36 57 7 44 .. .. .. .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 5757-01349-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 54 18.7141 DE: -08 54 51.114 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .026, .030 ) * V mag [mag]: 11.0 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (798) Ruth approx. diameter [km]: 45 approx. diameter ["]: .021 distance from Earth [AU]: 2.96100 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1146 number of rejected observations: 67 time covered by the observations: 1914 Nov 21 - 2012 Oct 09 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.010, 76° remarks: * orbital elements for (798) Ruth : Mean anomaly = 72.45430564 deg Arg. of pericenter = 41.24832912 deg Long. of node = 214.48960709 deg Inclination = 9.22869951 deg Eccentricity = 0.03911610 Semimajor axis = 3.01298516 AU Perihelion dist = 2.89512893 AU Mag: H = 9.48, G = 0.15 Epoch of elements : MJD 56245.15400000 TDT (2012 Nov 14.154) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 14 798 Ruth 3h 41.5m UT 11.0 20 54 18.714- 8 54 51.11TYC 5757-01349-1 11.7 15.2 45 2.1 2.961 2.477 2.33 -155.4533 -8.914 120.74 -18.31 3.6920 -0.04809 0.80653 12.35694 0.78320 0.00564 0.00176 2000 71.483007201211 9.00000 41.248329214.489607 9.2287000.03911610 3.0129852 2.8951289 9.5 5.00.15 RATE 1.8845540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.029 359 2.52 0.032 0 0 1-4 056226.0020121114_1349-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org