IOTA/IOTA-ES occultation update for (37) Fides / TYC 6893-00827-1 event on 2009 Oct 05, 10:39 UT Visible from Summary ------- On 2009 Oct 05 UT, the 108 km diameter asteroid (37) Fides will occult a 9.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 12.4 mag (the magnitude of the asteroid) for at most 10.1 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: 96 * date and approx. time of event: 2009 Oct 05, 10:39 - 2009 Oct 05, 10:46 UT * magnitude of target star: 9.0 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 10.1 * Moon: 98 % sunlit, 95° distance * Sun: 99° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 89° ) * approx speed of asteroid's shadow [km/s]: 10.7197 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6893-00827-1 by 37 Fides on 2009 Oct 5 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 107 0 0 13 57 42 10 39 0 50 162 -1 13 17 32 14 38 17 12 44 55 15 11 53 108 0 0 14 16 24 10 39 11 50 163 -2 13 36 6 14 57 8 13 3 22 15 30 52 109 0 0 14 35 51 10 39 22 50 165 -3 13 55 24 15 16 44 13 22 32 15 50 35 110 0 0 14 56 1 10 39 33 49 166 -4 14 15 25 15 37 3 13 42 26 16 11 3 111 0 0 15 16 56 10 39 44 49 168 -5 14 36 10 15 58 7 14 3 4 16 32 15 112 0 0 15 38 33 10 39 55 49 169 -6 14 57 38 16 19 55 14 24 24 16 54 11 113 0 0 16 0 54 10 40 7 49 171 -7 15 19 49 16 42 27 14 46 27 17 16 51 114 0 0 16 23 58 10 40 18 49 172 -8 15 42 43 17 5 41 15 9 12 17 40 15 115 0 0 16 47 45 10 40 29 49 174 -9 16 6 19 17 29 39 15 32 40 18 4 22 116 0 0 17 12 14 10 40 40 48 175 -10 16 30 37 17 54 19 15 56 49 18 29 11 117 0 0 17 37 25 10 40 51 48 177 -11 16 55 37 18 19 41 16 21 40 18 54 43 118 0 0 18 3 17 10 41 2 47 178 -12 17 21 18 18 45 45 16 47 12 19 20 57 119 0 0 18 29 50 10 41 12 47 179 -13 17 47 39 19 12 30 17 13 25 19 47 52 120 0 0 18 57 4 10 41 23 47 181 -14 18 14 41 19 39 56 17 40 17 20 15 28 121 0 0 19 24 57 10 41 34 46 182 -15 18 42 23 20 8 2 18 7 49 20 43 45 122 0 0 19 53 30 10 41 45 46 183 -16 19 10 43 20 36 47 18 36 0 21 12 41 123 0 0 20 22 42 10 41 55 45 185 -17 19 39 42 21 6 12 19 4 49 21 42 16 124 0 0 20 52 31 10 42 6 44 186 -18 20 9 19 21 36 14 19 34 16 22 12 30 125 0 0 21 22 58 10 42 16 44 187 -19 20 39 33 22 6 54 20 4 20 22 43 21 126 0 0 21 54 1 10 42 27 43 189 -20 21 10 23 22 38 11 20 35 0 23 14 49 127 0 0 22 25 40 10 42 37 43 190 -21 21 41 49 23 10 3 21 6 15 23 46 53 128 0 0 22 57 54 10 42 47 42 191 -22 22 13 50 23 42 31 21 38 5 24 19 32 129 0 0 23 30 41 10 42 57 41 192 -23 22 46 24 24 15 32 22 10 29 24 52 45 130 0 0 24 4 1 10 43 7 40 193 -24 23 19 31 24 49 6 22 43 25 25 26 31 131 0 0 24 37 53 10 43 16 40 194 -24 23 53 9 25 23 12 23 16 53 26 0 49 132 0 0 25 12 16 10 43 26 39 195 -25 24 27 19 25 57 49 23 50 52 26 35 37 133 0 0 25 47 9 10 43 35 38 196 -26 25 1 58 26 32 55 24 25 20 27 10 56 134 0 0 26 22 30 10 43 44 37 197 -27 25 37 5 27 8 30 25 0 17 27 46 43 135 0 0 26 58 18 10 43 53 36 198 -28 26 12 40 27 44 33 25 35 41 28 22 57 136 0 0 27 34 32 10 44 2 35 199 -29 26 48 40 28 21 1 26 11 30 28 59 37 137 0 0 28 11 10 10 44 11 35 200 -29 27 25 5 28 57 53 26 47 45 29 36 41 138 0 0 28 48 12 10 44 19 34 201 -30 28 1 53 29 35 9 27 24 22 30 14 9 139 0 0 29 25 35 10 44 27 33 202 -31 28 39 4 30 12 46 28 1 22 30 51 58 140 0 0 30 3 19 10 44 35 32 203 -32 29 16 34 30 50 44 28 38 42 31 30 7 141 0 0 30 41 22 10 44 43 31 204 -32 29 54 24 31 29 0 29 16 21 32 8 35 142 0 0 31 19 41 10 44 50 30 205 -33 30 32 31 32 7 33 29 54 18 32 47 20 143 0 0 31 58 17 10 44 58 29 206 -34 31 10 53 32 46 22 30 32 31 33 26 20 144 0 0 32 37 6 10 45 5 28 206 -34 31 49 30 33 25 24 31 10 58 34 5 33 145 0 0 33 16 8 10 45 12 27 207 -35 32 28 20 34 4 38 31 49 38 34 44 59 146 0 0 33 55 20 10 45 18 26 208 -36 33 7 21 34 44 3 32 28 29 35 24 34 147 0 0 34 34 42 10 45 24 25 209 -36 33 46 30 35 23 37 33 7 30 36 4 18 148 0 0 35 14 11 10 45 31 24 210 -37 34 25 48 36 3 18 33 46 39 36 44 9 149 0 0 35 53 45 10 45 36 23 210 -37 35 5 11 36 43 3 34 25 53 37 24 5 150 0 0 36 33 23 10 45 42 22 211 -38 35 44 39 37 22 53 35 5 13 38 4 3 151 0 0 37 13 3 10 45 47 21 212 -38 36 24 9 38 2 43 35 44 35 38 44 3 152 0 0 37 52 44 10 45 52 20 213 -38 37 3 40 38 42 34 36 23 58 39 24 3 153 0 0 38 32 23 10 45 57 19 213 -39 37 43 9 39 22 23 37 3 20 40 4 0 154 0 0 39 11 59 10 46 1 18 214 -39 38 22 36 40 2 8 37 42 41 40 43 53 155 0 0 39 51 30 10 46 6 17 215 -39 39 1 59 40 41 48 38 21 57 41 23 40 156 0 0 40 30 54 10 46 10 16 216 -40 39 41 16 41 21 21 39 1 7 42 3 20 157 0 0 41 10 10 10 46 13 15 216 -40 40 20 25 42 0 44 39 40 10 42 42 51 158 0 0 41 49 17 10 46 17 14 217 -40 40 59 24 42 39 58 40 19 5 43 22 10 159 0 0 42 28 11 10 46 20 13 218 -40 41 38 13 43 18 59 40 57 48 44 1 17 160 0 0 43 6 53 10 46 23 12 218 -41 42 16 49 43 57 46 41 36 20 44 40 9 161 0 0 43 45 19 10 46 26 11 219 -41 42 55 11 44 36 18 42 14 38 45 18 46 162 0 0 44 23 30 10 46 28 10 220 -41 43 33 17 45 14 33 42 52 41 45 57 5 163 0 0 45 1 23 10 46 30 9 221 -41 44 11 6 45 52 30 43 30 28 46 35 5 164 0 0 45 38 57 10 46 32 9 221 -41 44 48 37 46 30 7 44 7 56 47 12 45 165 0 0 46 16 11 10 46 34 8 222 -41 45 25 48 47 7 24 44 45 6 47 50 4 166 0 0 46 53 2 10 46 36 7 223 -41 46 2 38 47 44 17 45 21 54 48 26 59 167 0 0 47 29 31 10 46 37 6 224 -41 46 39 6 48 20 47 45 58 22 49 3 30 168 0 0 48 5 36 10 46 38 5 224 -41 47 15 11 48 56 53 46 34 26 49 39 36 169 0 0 48 41 16 10 46 39 4 225 -41 47 50 51 49 32 32 47 10 6 50 15 15 170 0 0 49 16 30 10 46 40 3 226 -41 48 26 5 50 7 45 47 45 21 50 50 27 171 0 0 49 51 16 10 46 40 2 227 -41 49 0 53 50 42 30 48 20 10 51 25 11 172 0 0 50 25 34 10 46 41 1 227 -40 49 35 14 51 16 46 48 54 33 51 59 25 173 0 0 50 59 23 10 46 41 1 228 -40 50 9 6 .. .. .. 49 28 27 .. .. .. Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6893-00827-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 35 26.0984 DE: -24 32 21.084 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .023 ) * V mag [mag]: 9.0 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (37) Fides approx. diameter [km]: 108 approx. diameter ["]: .061 distance from Earth [AU]: 2.44400 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1246 number of rejected observations: 153 time covered by the observations: 1900 Feb 24 - 2008 Apr 17 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.008, 80° remarks: * orbital elements for (37) Fides : Mean anomaly = 261.37176991 deg Arg. of pericenter = 62.44179446 deg Long. of node = 7.34167127 deg Inclination = 3.07335415 deg Eccentricity = 0.17483237 Semimajor axis = 2.64437051 AU Perihelion dist = 2.18204894 AU Mag: H = 7.38, G = 0.24 Epoch of elements : MJD 55109.44400000 TDT (2009 Oct 05.444) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 5 37 Fides 10h 39.1m UT 9.0 19 35 26.098-24 32 21.08TYC 6893-00827-1 10.2 12.4 108 10.1 2.444 1.515 6.85 119.8308 -24.540 17.32 -4.87 10.6524 -0.20525 0.61498 5.74301 1.90431 0.00556 0.00095 2000 259.2071752009 926.00000 62.441794 7.341671 3.0733540.17483237 2.6443705 2.1820489 7.3 5.00.24 RATE 2.2920320 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.024 89 1.41 0.025 0 54581.5020091005_0827-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org