IOTA/IOTA-ES occultation update for (771) Libera / TYC 0005-00626-1 event on 2012 Dec 14, 05:00 UT Visible from Mexico Summary ------- On 2012 Dec 14 UT, the 29 km diameter asteroid (771) Libera will occult a 10.4 mag star in the constellation Pisces for observers along a path across Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 14.6 mag (the magnitude of the asteroid) for at most 2.2 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: 50 * date and approx. time of event: 2012 Dec 14, 04:57 - 2012 Dec 14, 05:08 UT * geocentric midpoint of event [JD]: 2456275.7090125 * magnitude of target star: 10.4 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 2.2 * Moon: 1 % sunlit, 89° distance * Sun: 102° distance * rough path description: Mexico The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 1.27 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .029", 88° ) * approx speed of asteroid's shadow [km/s]: 12.8473 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0005-00626-1 by 771 Libera on 2012 Dec 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 180 0 0 30 47 8 4 57 33 54 133 0 30 38 30 30 55 46 30 16 38 31 17 45 -179 0 0 30 42 48 4 57 40 55 134 -1 30 34 10 30 51 26 30 12 18 31 13 26 -178 0 0 30 38 21 4 57 47 56 136 -2 30 29 43 30 46 59 30 7 50 31 8 59 -177 0 0 30 33 47 4 57 54 56 137 -3 30 25 9 30 42 25 30 3 16 31 4 25 -176 0 0 30 29 5 4 58 1 57 139 -3 30 20 27 30 37 44 29 58 34 30 59 44 -175 0 0 30 24 16 4 58 8 58 140 -4 30 15 38 30 32 55 29 53 44 30 54 55 -174 0 0 30 19 20 4 58 15 58 142 -5 30 10 42 30 27 59 29 48 48 30 50 0 -173 0 0 30 14 18 4 58 22 59 143 -6 30 5 39 30 22 57 29 43 45 30 44 57 -172 0 0 30 9 8 4 58 29 59 145 -6 30 0 29 30 17 47 29 38 35 30 39 48 -171 0 0 30 3 51 4 58 37 60 147 -7 29 55 13 30 12 30 29 33 18 30 34 32 -170 0 0 29 58 28 4 58 44 61 148 -8 29 49 49 30 7 7 29 27 54 30 29 9 -169 0 0 29 52 58 4 58 52 61 150 -9 29 44 19 30 1 37 29 22 24 30 23 39 -168 0 0 29 47 21 4 58 59 62 152 -10 29 38 42 29 56 1 29 16 47 30 18 3 -167 0 0 29 41 38 4 59 7 62 154 -10 29 32 59 29 50 18 29 11 3 30 12 20 -166 0 0 29 35 49 4 59 14 63 156 -11 29 27 9 29 44 28 29 5 13 30 6 31 -165 0 0 29 29 53 4 59 22 63 158 -12 29 21 13 29 38 33 28 59 17 30 0 36 -164 0 0 29 23 51 4 59 30 63 160 -13 29 15 11 29 32 31 28 53 14 29 54 34 -163 0 0 29 17 43 4 59 37 64 162 -14 29 9 3 29 26 23 28 47 6 29 48 27 -162 0 0 29 11 28 4 59 45 64 165 -15 29 2 49 29 20 9 28 40 51 29 42 13 -161 0 0 29 5 8 4 59 53 65 167 -15 28 56 28 29 13 49 28 34 30 29 35 53 -160 0 0 28 58 42 5 0 1 65 169 -16 28 50 2 29 7 23 28 28 4 29 29 28 -159 0 0 28 52 11 5 0 9 65 172 -17 28 43 31 29 0 51 28 21 32 29 22 57 -158 0 0 28 45 34 5 0 16 65 174 -18 28 36 53 28 54 14 28 14 54 29 16 20 -157 0 0 28 38 51 5 0 24 65 176 -19 28 30 11 28 47 32 28 8 11 29 9 38 -156 0 0 28 32 3 5 0 32 66 179 -20 28 23 22 28 40 44 28 1 23 29 2 50 -155 0 0 28 25 10 5 0 40 66 181 -20 28 16 29 28 33 51 27 54 29 28 55 57 -154 0 0 28 18 11 5 0 48 66 184 -21 28 9 31 28 26 53 27 47 31 28 48 59 -153 0 0 28 11 8 5 0 56 66 187 -22 28 2 27 28 19 49 27 40 27 28 41 56 -152 0 0 28 4 0 5 1 4 66 189 -23 27 55 19 28 12 41 27 33 18 28 34 49 -151 0 0 27 56 47 5 1 12 66 192 -24 27 48 6 28 5 29 27 26 5 28 27 36 -150 0 0 27 49 29 5 1 20 66 194 -25 27 40 48 27 58 11 27 18 47 28 20 19 -149 0 0 27 42 8 5 1 28 66 197 -25 27 33 26 27 50 49 27 11 25 28 12 58 -148 0 0 27 34 41 5 1 36 65 199 -26 27 26 0 27 43 23 27 3 58 28 5 32 -147 0 0 27 27 11 5 1 44 65 202 -27 27 18 29 27 35 53 26 56 27 27 58 2 -146 0 0 27 19 36 5 1 52 65 204 -28 27 10 55 27 28 19 26 48 53 27 50 28 -145 0 0 27 11 58 5 2 0 65 206 -29 27 3 16 27 20 40 26 41 14 27 42 50 -144 0 0 27 4 16 5 2 8 64 209 -30 26 55 34 27 12 58 26 33 31 27 35 8 -143 0 0 26 56 30 5 2 16 64 211 -31 26 47 48 27 5 13 26 25 45 27 27 22 -142 0 0 26 48 41 5 2 24 64 213 -32 26 39 59 26 57 24 26 17 56 27 19 34 -141 0 0 26 40 49 5 2 32 63 215 -32 26 32 7 26 49 31 26 10 3 27 11 42 -140 0 0 26 32 53 5 2 40 63 217 -33 26 24 11 26 41 36 26 2 7 27 3 46 -139 0 0 26 24 54 5 2 47 62 219 -34 26 16 12 26 33 37 25 54 8 26 55 48 -138 0 0 26 16 53 5 2 55 62 221 -35 26 8 11 26 25 36 25 46 7 26 47 47 -137 0 0 26 8 49 5 3 3 61 223 -36 26 0 7 26 17 32 25 38 2 26 39 43 -136 0 0 26 0 42 5 3 11 61 225 -37 25 52 0 26 9 25 25 29 56 26 31 37 -135 0 0 25 52 34 5 3 19 60 227 -38 25 43 51 26 1 17 25 21 46 26 23 28 -134 0 0 25 44 22 5 3 26 60 229 -39 25 35 40 25 53 6 25 13 35 26 15 17 -133 0 0 25 36 9 5 3 34 59 230 -39 25 27 27 25 44 53 25 5 22 26 7 4 -132 0 0 25 27 54 5 3 42 58 232 -40 25 19 12 25 36 38 24 57 7 25 58 49 -131 0 0 25 19 38 5 3 49 58 233 -41 25 10 55 25 28 21 24 48 50 25 50 33 -130 0 0 25 11 20 5 3 57 57 235 -42 25 2 37 25 20 3 24 40 32 25 42 15 -129 0 0 25 3 0 5 4 4 56 236 -43 24 54 17 25 11 43 24 32 12 25 33 56 -128 0 0 24 54 39 5 4 12 56 238 -44 24 45 57 25 3 23 24 23 51 25 25 35 -127 0 0 24 46 18 5 4 19 55 239 -45 24 37 35 24 55 1 24 15 29 25 17 14 -126 0 0 24 37 55 5 4 26 54 240 -46 24 29 12 24 46 39 24 7 7 25 8 51 -125 0 0 24 29 32 5 4 34 53 241 -47 24 20 49 24 38 16 23 58 44 25 0 28 -124 0 0 24 21 9 5 4 41 53 243 -48 24 12 26 24 29 52 23 50 20 24 52 5 -123 0 0 24 12 45 5 4 48 52 244 -48 24 4 2 24 21 28 23 41 56 24 43 41 -122 0 0 24 4 21 5 4 55 51 245 -49 23 55 38 24 13 4 23 33 32 24 35 17 -121 0 0 23 55 57 5 5 2 50 246 -50 23 47 14 24 4 40 23 25 8 24 26 53 -120 0 0 23 47 33 5 5 9 50 247 -51 23 38 50 23 56 16 23 16 44 24 18 29 -119 0 0 23 39 9 5 5 16 49 248 -52 23 30 26 23 47 53 23 8 21 24 10 6 -118 0 0 23 30 47 5 5 23 48 249 -53 23 22 4 23 39 30 22 59 58 24 1 43 -117 0 0 23 22 25 5 5 29 47 250 -54 23 13 42 23 31 8 22 51 36 23 53 21 -116 0 0 23 14 3 5 5 36 46 251 -55 23 5 20 23 22 47 22 43 15 23 45 0 -115 0 0 23 5 43 5 5 42 45 251 -56 22 57 0 23 14 27 22 34 55 23 36 39 -114 0 0 22 57 25 5 5 49 44 252 -57 22 48 42 23 6 8 22 26 36 23 28 21 -113 0 0 22 49 7 5 5 55 44 253 -58 22 40 25 22 57 51 22 18 19 23 20 3 -112 0 0 22 40 52 5 6 1 43 254 -59 22 32 9 22 49 35 22 10 3 23 11 47 -111 0 0 22 32 38 5 6 7 42 255 -59 22 23 55 22 41 21 22 1 50 23 3 33 -110 0 0 22 24 26 5 6 13 41 255 -60 22 15 43 22 33 9 21 53 38 22 55 21 -109 0 0 22 16 16 5 6 19 40 256 -61 22 7 34 22 25 0 21 45 28 22 47 12 -108 0 0 22 8 9 5 6 25 39 257 -62 21 59 26 22 16 52 21 37 21 22 39 4 -107 0 0 22 0 4 5 6 31 38 257 -63 21 51 21 22 8 47 21 29 16 22 30 59 -106 0 0 21 52 2 5 6 37 37 258 -64 21 43 19 22 0 45 21 21 14 22 22 56 -105 0 0 21 44 2 5 6 42 37 259 -65 21 35 20 21 52 45 21 13 15 22 14 57 -104 0 0 21 36 6 5 6 47 36 259 -66 21 27 23 21 44 49 21 5 19 22 7 0 -103 0 0 21 28 12 5 6 53 35 260 -67 21 19 30 21 36 55 20 57 26 21 59 6 -102 0 0 21 20 22 5 6 58 34 260 -68 21 11 40 21 29 5 20 49 36 21 51 16 -101 0 0 21 12 36 5 7 3 33 261 -69 21 3 53 21 21 18 20 41 49 21 43 29 -100 0 0 21 4 53 5 7 8 32 261 -70 20 56 10 21 13 35 20 34 7 21 35 46 - 99 0 0 20 57 13 5 7 12 31 262 -70 20 48 31 21 5 56 20 26 28 21 28 6 - 98 0 0 20 49 38 5 7 17 30 262 -71 20 40 56 20 58 21 20 18 53 21 20 31 - 97 0 0 20 42 7 5 7 22 29 263 -72 20 33 25 20 50 50 20 11 22 21 13 0 - 96 0 0 20 34 40 5 7 26 28 263 -73 20 25 58 20 43 23 20 3 56 21 5 32 - 95 0 0 20 27 18 5 7 30 27 264 -74 20 18 36 20 36 0 19 56 34 20 58 10 - 94 0 0 20 20 0 5 7 34 26 264 -75 20 11 18 20 28 42 19 49 16 20 50 51 - 93 0 0 20 12 47 5 7 38 25 265 -76 20 4 5 20 21 29 19 42 3 20 43 38 - 92 0 0 20 5 38 5 7 42 25 265 -77 19 56 57 20 14 20 19 34 55 20 36 29 - 91 0 0 19 58 35 5 7 46 24 266 -78 19 49 54 20 7 17 19 27 52 20 29 25 - 90 0 0 19 51 37 5 7 50 23 266 -78 19 42 56 20 0 19 19 20 54 20 22 27 - 89 0 0 19 44 44 5 7 53 22 267 -79 19 36 3 19 53 26 19 14 2 20 15 33 - 88 0 0 19 37 56 5 7 56 21 267 -80 19 29 15 19 46 38 19 7 14 20 8 45 - 87 0 0 19 31 14 5 7 59 20 267 -81 19 22 33 19 39 56 19 0 33 20 2 3 - 86 0 0 19 24 38 5 8 2 19 268 -82 19 15 57 19 33 19 18 53 57 19 55 26 - 85 0 0 19 18 7 5 8 5 18 268 -82 19 9 26 19 26 48 18 47 26 19 48 55 - 84 0 0 19 11 42 5 8 8 17 268 -83 19 3 2 19 20 24 18 41 2 19 42 30 - 83 0 0 19 5 24 5 8 11 16 269 -84 18 56 43 19 14 5 18 34 44 19 36 11 - 82 0 0 18 59 11 5 8 13 15 269 -84 18 50 31 19 7 52 18 28 31 19 29 58 - 81 0 0 18 53 5 5 8 15 14 270 -85 18 44 25 19 1 46 18 22 26 19 23 51 - 80 0 0 18 47 5 5 8 18 13 270 -85 18 38 25 18 55 46 18 16 26 19 17 51 - 79 0 0 18 41 12 5 8 20 12 270 -85 18 32 31 18 49 52 18 10 33 19 11 57 - 78 0 0 18 35 25 5 8 21 11 271 -85 18 26 45 18 44 5 18 4 47 19 6 10 - 77 0 0 18 29 45 5 8 23 10 271 -85 18 21 5 18 38 25 17 59 7 19 0 30 - 76 0 0 18 24 11 5 8 25 9 271 -84 18 15 32 18 32 52 17 53 34 18 54 56 - 75 0 0 18 18 45 5 8 26 8 272 -84 18 10 5 18 27 25 17 48 8 18 49 29 - 74 0 0 18 13 26 5 8 27 7 272 -83 18 4 46 18 22 6 17 42 49 18 44 9 - 73 0 0 18 8 13 5 8 28 6 272 -83 17 59 34 18 16 53 17 37 37 18 38 57 - 72 0 0 18 3 8 5 8 29 5 273 -82 17 54 29 18 11 48 17 32 32 18 33 51 - 71 0 0 17 58 10 5 8 30 5 273 -81 17 49 31 18 6 50 17 27 35 18 28 53 - 70 0 0 17 53 20 5 8 31 4 273 -80 17 44 41 18 2 0 17 22 45 18 24 2 - 69 0 0 17 48 37 5 8 31 3 273 -79 17 39 58 17 57 16 17 18 2 18 19 19 - 68 0 0 17 44 1 5 8 32 2 274 -79 17 35 23 17 52 41 .. .. .. 18 14 43 - 67 0 0 17 39 33 5 8 32 1 274 -78 17 30 55 17 48 13 .. .. .. 18 10 15 Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0005-00626-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 10 41.0438 DE: +04 00 22.904 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .026 ) * V mag [mag]: 10.4 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (771) Libera approx. diameter [km]: 29 approx. diameter ["]: .023 distance from Earth [AU]: 1.75700 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 933 number of rejected observations: 48 time covered by the observations: 1913 Nov 27 - 2012 Nov 27 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.013, 85° remarks: * orbital elements for (771) Libera : Mean anomaly = 325.48537768 deg Arg. of pericenter = 227.44134534 deg Long. of node = 218.23241530 deg Inclination = 14.94309752 deg Eccentricity = 0.24883025 Semimajor axis = 2.65058466 AU Perihelion dist = 1.99103903 AU Mag: H = 10.26, G = 0.15 Epoch of elements : MJD 56275.20900000 TDT (2012 Dec 14.209) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 14 771 Libera 5h 1.0m UT 10.4 0 10 41.044 4 0 22.90TYC 0005-00626-1 10.7 14.6 29 2.2 1.757 2.410 -4.11 -155.8486 4.008 103.44 -23.23 5.0163 0.04635 0.40502 7.20436 -0.82417 0.00513 0.00217 2000 324.295655201212 9.00000227.441345218.232415 14.9430980.24883025 2.6505847 1.991039010.5 5.00.15 RATE 2.2839760 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.029 88 2.27 0.029 0 0-2 4 056264.0020121214_0626-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org