IOTA/IOTA-ES occultation update for (1006) Lagrangea / TYC 6314-00538-1 event on 2012 Nov 07, 03:44 UT Visible from W USA Summary ------- On 2012 Nov 07 UT, the 32 km diameter asteroid (1006) Lagrangea will occult a 10.1 mag star in the constellation Sagittarius for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.3 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: 46 * date and approx. time of event: 2012 Nov 07, 03:45 - 2012 Nov 07, 03:47 UT * geocentric midpoint of event [JD]: 2456238.6558625 * magnitude of target star: 10.1 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 1.3 * Moon: 49 % sunlit, 164° distance * Sun: 74° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 1.43 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .027", 76° ) * approx speed of asteroid's shadow [km/s]: 25.4407 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6314-00538-1 by 1006 Lagrangea on 2012 Nov 7 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 -156 0 0 20 33 32 3 45 30 54 191 -1 20 22 37 20 44 29 19 51 30 21 15 55 -155 0 0 20 54 52 3 45 35 53 192 -2 20 43 56 21 5 50 20 12 45 21 37 19 -154 0 0 21 16 28 3 45 39 53 194 -3 21 5 30 21 27 27 20 34 17 21 59 0 -153 0 0 21 38 19 3 45 43 52 195 -4 21 27 20 21 49 19 20 56 3 22 20 55 -152 0 0 22 0 24 3 45 47 51 197 -5 21 49 24 22 11 25 21 18 4 22 43 5 -151 0 0 22 22 43 3 45 51 51 198 -6 22 11 42 22 33 46 21 40 19 23 5 28 -150 0 0 22 45 16 3 45 55 50 199 -7 22 34 14 22 56 19 22 2 48 23 28 5 -149 0 0 23 8 1 3 45 59 49 201 -8 22 56 58 23 19 6 22 25 29 23 50 54 -148 0 0 23 30 58 3 46 3 49 202 -9 23 19 54 23 42 4 22 48 22 24 13 56 -147 0 0 23 54 7 3 46 7 48 203 -10 23 43 2 24 5 14 23 11 27 24 37 9 -146 0 0 24 17 27 3 46 11 47 204 -11 24 6 21 24 28 34 23 34 43 25 0 32 -145 0 0 24 40 56 3 46 15 47 205 -12 24 29 49 24 52 5 23 58 9 25 24 6 -144 0 0 25 4 36 3 46 18 46 207 -13 24 53 28 25 15 45 24 21 45 25 47 49 -143 0 0 25 28 24 3 46 22 45 208 -14 25 17 15 25 39 34 24 45 29 26 11 40 -142 0 0 25 52 20 3 46 26 44 209 -15 25 41 10 26 3 31 25 9 22 26 35 40 -141 0 0 26 16 24 3 46 29 44 210 -16 26 5 13 26 27 36 25 33 22 26 59 47 -140 0 0 26 40 34 3 46 33 43 211 -17 26 29 22 26 51 47 25 57 30 27 24 1 -139 0 0 27 4 51 3 46 36 42 212 -18 26 53 38 27 16 5 26 21 43 27 48 20 -138 0 0 27 29 13 3 46 40 41 213 -18 27 17 59 27 40 27 26 46 2 28 12 45 -137 0 0 27 53 39 3 46 43 40 214 -19 27 42 25 28 4 55 27 10 26 28 37 15 -136 0 0 28 18 10 3 46 46 39 215 -20 28 6 55 28 29 26 27 34 54 29 1 48 -135 0 0 28 42 44 3 46 49 39 215 -21 28 31 29 28 54 1 27 59 26 29 26 25 -134 0 0 29 7 21 3 46 52 38 216 -22 28 56 5 29 18 38 28 24 0 29 51 4 -133 0 0 29 31 59 3 46 56 37 217 -23 29 20 43 29 43 17 28 48 36 30 15 44 -132 0 0 29 56 39 3 46 58 36 218 -24 29 45 22 30 7 57 29 13 14 30 40 26 -131 0 0 30 21 19 3 47 1 35 219 -25 30 10 2 30 32 38 29 37 53 31 5 8 -130 0 0 30 45 59 3 47 4 34 220 -26 30 34 41 30 57 19 30 2 31 31 29 50 -129 0 0 31 10 38 3 47 7 33 220 -27 30 59 20 31 21 58 30 27 9 31 54 31 -128 0 0 31 35 16 3 47 10 32 221 -28 31 23 58 31 46 36 30 51 45 32 19 10 -127 0 0 31 59 52 3 47 12 32 222 -29 31 48 33 32 11 12 31 16 20 32 43 47 -126 0 0 32 24 24 3 47 15 31 223 -29 32 13 5 32 35 45 31 40 52 33 8 20 -125 0 0 32 48 54 3 47 17 30 223 -30 32 37 34 33 0 14 32 5 20 33 32 50 -124 0 0 33 13 19 3 47 20 29 224 -31 33 1 59 33 24 40 32 29 44 33 57 16 -123 0 0 33 37 39 3 47 22 28 225 -32 33 26 19 33 49 0 32 54 4 34 21 37 -122 0 0 34 1 54 3 47 24 27 226 -33 33 50 34 34 13 15 33 18 19 34 45 52 -121 0 0 34 26 3 3 47 26 26 226 -34 34 14 43 34 37 24 33 42 28 35 10 0 -120 0 0 34 50 5 3 47 28 25 227 -34 34 38 45 35 1 26 34 6 30 35 34 2 -119 0 0 35 14 0 3 47 30 25 228 -35 35 2 40 35 25 21 34 30 25 35 57 57 -118 0 0 35 37 47 3 47 32 24 228 -36 35 26 27 35 49 8 34 54 13 36 21 44 -117 0 0 36 1 26 3 47 34 23 229 -37 35 50 6 36 12 46 35 17 52 36 45 22 -116 0 0 36 24 55 3 47 36 22 230 -38 36 13 37 36 36 16 35 41 23 37 8 51 -115 0 0 36 48 16 3 47 38 21 230 -38 36 36 57 36 59 36 36 4 45 37 32 10 -114 0 0 37 11 26 3 47 39 20 231 -39 37 0 8 37 22 46 36 27 56 37 55 20 -113 0 0 37 34 27 3 47 41 19 232 -40 37 23 9 37 45 46 36 50 58 38 18 18 -112 0 0 37 57 16 3 47 42 19 233 -40 37 45 58 38 8 35 37 13 49 38 41 6 -111 0 0 38 19 53 3 47 44 18 233 -41 38 8 36 38 31 12 37 36 28 39 3 42 -110 0 0 38 42 19 3 47 45 17 234 -42 38 31 3 38 53 38 37 58 56 39 26 6 -109 0 0 39 4 33 3 47 46 16 235 -43 38 53 17 39 15 51 38 21 12 39 48 17 -108 0 0 39 26 34 3 47 47 15 235 -43 39 15 18 39 37 51 38 43 15 40 10 16 -107 0 0 39 48 22 3 47 49 14 236 -44 39 37 7 39 59 38 39 5 5 40 32 1 -106 0 0 40 9 56 3 47 50 13 237 -44 39 58 42 40 21 12 39 26 42 40 53 33 -105 0 0 40 31 17 3 47 51 13 237 -45 40 20 3 40 42 32 39 48 5 41 14 51 -104 0 0 40 52 23 3 47 52 12 238 -46 40 41 10 41 3 38 40 9 14 41 35 55 -103 0 0 41 13 15 3 47 52 11 239 -46 41 2 3 41 24 29 40 30 9 41 56 43 -102 0 0 41 33 52 3 47 53 10 239 -47 41 22 41 41 45 5 40 50 49 42 17 17 -101 0 0 41 54 14 3 47 54 9 240 -47 41 43 4 42 5 26 41 11 14 42 37 36 -100 0 0 42 14 21 3 47 54 8 241 -48 42 3 11 42 25 32 41 31 24 42 57 39 - 99 0 0 42 34 12 3 47 55 8 241 -48 42 23 3 42 45 22 41 51 18 43 17 27 - 98 0 0 42 53 47 3 47 56 7 242 -49 42 42 39 43 4 56 42 10 57 43 36 58 - 97 0 0 43 13 5 3 47 56 6 243 -49 43 1 59 43 24 14 42 30 20 43 56 13 - 96 0 0 43 32 8 3 47 56 5 243 -50 43 21 2 43 43 15 42 49 26 44 15 12 - 95 0 0 43 50 54 3 47 57 4 244 -50 43 39 49 44 2 0 43 8 16 44 33 54 - 94 0 0 44 9 23 3 47 57 4 245 -51 43 58 19 44 20 28 43 26 49 44 52 19 - 93 0 0 44 27 36 3 47 57 3 245 -51 44 16 33 44 38 40 43 45 5 45 10 27 - 92 0 0 44 45 31 3 47 57 2 246 -52 44 34 29 44 56 34 .. .. .. 45 28 19 - 91 0 0 45 3 9 3 47 58 1 247 -52 44 52 8 45 14 11 .. .. .. 45 45 53 - 90 0 0 45 20 30 3 47 58 1 248 -52 45 9 30 45 31 31 .. .. .. 46 3 9 Uncertainty in time = +/- 2 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 6314-00538-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 01 15.8862 DE: -15 13 13.526 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .023 ) * V mag [mag]: 10.1 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1006) Lagrangea approx. diameter [km]: 32 approx. diameter ["]: .019 distance from Earth [AU]: 2.37700 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 910 number of rejected observations: 22 time covered by the observations: 1923 Sep 16 - 2012 Sep 27 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.015, 65° remarks: * orbital elements for (1006) Lagrangea : Mean anomaly = 332.10214166 deg Arg. of pericenter = 86.31512172 deg Long. of node = 294.80453068 deg Inclination = 10.91871267 deg Eccentricity = 0.35191659 Semimajor axis = 3.15121757 AU Perihelion dist = 2.04225184 AU Mag: H = 11.15, G = 0.15 Epoch of elements : MJD 56238.15600000 TDT (2012 Nov 07.156) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 7 1006 Lagrangea 3h 44.4m UT 10.1 20 1 15.886-15 13 13.53TYC 6314-00538-1 10.3 16.0 32 1.3 2.377 3.539 14.09 -162.5481 -15.224 119.81 -16.38 3.7407 -0.13775 0.51278 13.84488 3.80961 0.00531 0.00124 2000 330.66511920121030.00000 86.315122294.804531 10.9187130.35191659 3.1512176 2.042251811.2 5.00.15 RATE 1.7619210 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.027 76 2.43 0.026 0 0 2 4 056208.0020121107_0538-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org