IOTA/IOTA-ES occultation update for (465) Alekto / TYC 0577-00861-1 event on 2012 Nov 03, 05:04 UT Visible from Caribbean, Central America Summary ------- On 2012 Nov 03 UT, the 73 km diameter asteroid (465) Alekto will occult a 11.3 mag star in the constellation Pisces for observers along a path across Caribbean, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 15.5 mag (the magnitude of the asteroid) for at most 17.7 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: 65 * date and approx. time of event: 2012 Nov 03, 04:38 - 2012 Nov 03, 05:22 UT * geocentric midpoint of event [JD]: 2456234.71132917 * magnitude of target star: 11.3 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 17.7 * Moon: 84 % sunlit, 98° distance * Sun: 129° distance * rough path description: Caribbean, Central America The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 0.92 * 1 sigma uncertainty interval [seconds]: +/- 16.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .032", 87° ) * approx speed of asteroid's shadow [km/s]: 4.1081 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0577-00861-1 by 465 Alekto on 2012 Nov 3 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude -164 0 0 -33 27 10 5 22 1 46 45 0 -33 2 58 -33 51 25 -32 18 32 -34 36 8 -163 0 0 -32 52 51 5 21 42 47 45 -1 -32 28 34 -33 17 11 -31 43 58 -34 2 4 -162 0 0 -32 17 56 5 21 22 48 44 -2 -31 53 33 -32 42 21 -31 8 48 -33 27 23 -161 0 0 -31 42 25 5 21 3 49 43 -3 -31 17 57 -32 6 55 -30 33 3 -32 52 6 -160 0 0 -31 6 18 5 20 42 49 43 -4 -30 41 45 -31 30 53 -29 56 42 -32 16 13 -159 0 0 -30 29 36 5 20 21 50 42 -5 -30 4 58 -30 54 15 -29 19 47 -31 39 45 -158 0 0 -29 52 19 5 20 0 51 41 -6 -29 27 37 -30 17 3 -28 42 17 -31 2 41 -157 0 0 -29 14 27 5 19 38 52 41 -7 -28 49 41 -29 39 16 -28 4 13 -30 25 2 -156 0 0 -28 36 2 5 19 16 53 40 -8 -28 11 12 -29 0 55 -27 25 36 -29 46 49 -155 0 0 -27 57 4 5 18 53 54 39 -9 -27 32 10 -28 22 1 -26 46 27 -29 8 3 -154 0 0 -27 17 34 5 18 30 55 39 -10 -26 52 36 -27 42 35 -26 6 45 -28 28 44 -153 0 0 -26 37 32 5 18 6 56 38 -11 -26 12 30 -27 2 37 -25 26 33 -27 48 53 -152 0 0 -25 56 59 5 17 42 58 37 -12 -25 31 54 -26 22 7 -24 45 50 -27 8 30 -151 0 0 -25 15 56 5 17 18 59 36 -13 -24 50 47 -25 41 8 -24 4 37 -26 27 37 -150 0 0 -24 34 24 5 16 53 60 36 -14 -24 9 12 -24 59 39 -23 22 56 -25 46 14 -149 0 0 -23 52 24 5 16 27 61 35 -15 -23 27 9 -24 17 42 -22 40 48 -25 4 22 -148 0 0 -23 9 56 5 16 1 62 34 -16 -22 44 39 -23 35 17 -21 58 12 -24 22 2 -147 0 0 -22 27 3 5 15 35 63 33 -17 -22 1 42 -22 52 26 -21 15 11 -23 39 16 -146 0 0 -21 43 44 5 15 8 64 32 -18 -21 18 21 -22 9 9 -20 31 46 -22 56 3 -145 0 0 -21 0 1 5 14 41 65 31 -19 -20 34 36 -21 25 28 -19 47 56 -22 12 26 -144 0 0 -20 15 54 5 14 14 66 30 -20 -19 50 28 -20 41 24 -19 3 45 -21 28 26 -143 0 0 -19 31 27 5 13 46 67 29 -21 -19 5 58 -19 56 58 -18 19 12 -20 44 3 -142 0 0 -18 46 38 5 13 18 68 28 -22 -18 21 8 -19 12 11 -17 34 19 -19 59 18 -141 0 0 -18 1 30 5 12 49 69 26 -23 -17 35 59 -18 27 4 -16 49 8 -19 14 14 -140 0 0 -17 16 4 5 12 20 70 25 -24 -16 50 32 -17 41 40 -16 3 39 -18 28 51 -139 0 0 -16 30 22 5 11 51 71 23 -26 -16 4 49 -16 55 58 -15 17 54 -17 43 11 -138 0 0 -15 44 24 5 11 22 72 22 -27 -15 18 50 -16 10 0 -14 31 54 -16 57 15 -137 0 0 -14 58 12 5 10 52 73 20 -28 -14 32 37 -15 23 49 -13 45 40 -16 11 4 -136 0 0 -14 11 47 5 10 22 74 18 -29 -13 46 12 -14 37 24 -12 59 15 -15 24 40 -135 0 0 -13 25 11 5 9 51 75 15 -30 -12 59 36 -13 50 48 -12 12 38 -14 38 3 -134 0 0 -12 38 25 5 9 21 76 13 -31 -12 12 50 -13 4 2 -11 25 53 -13 51 17 -133 0 0 -11 51 30 5 8 50 77 10 -32 -11 25 56 -12 17 7 -10 38 59 -13 4 21 -132 0 0 -11 4 29 5 8 19 78 6 -33 -10 38 55 -11 30 5 - 9 51 59 -12 17 18 -131 0 0 -10 17 21 5 7 48 79 2 -34 - 9 51 49 -10 42 57 - 9 4 54 -11 30 8 -130 0 0 - 9 30 10 5 7 17 80 357 -35 - 9 4 38 - 9 55 44 - 8 17 45 -10 42 54 -129 0 0 - 8 42 56 5 6 46 80 352 -37 - 8 17 25 - 9 8 29 - 7 30 34 - 9 55 36 -128 0 0 - 7 55 41 5 6 14 81 346 -38 - 7 30 11 - 8 21 12 - 6 43 23 - 9 8 17 -127 0 0 - 7 8 26 5 5 43 81 339 -39 - 6 42 58 - 7 33 56 - 5 56 12 - 8 20 57 -126 0 0 - 6 21 12 5 5 11 82 332 -40 - 5 55 46 - 6 46 40 - 5 9 3 - 7 33 39 -125 0 0 - 5 34 2 5 4 40 82 323 -41 - 5 8 37 - 5 59 28 - 4 21 58 - 6 46 23 -124 0 0 - 4 46 56 5 4 8 82 315 -42 - 4 21 33 - 5 12 20 - 3 34 58 - 5 59 11 -123 0 0 - 3 59 56 5 3 37 82 307 -43 - 3 34 36 - 4 25 18 - 2 48 4 - 5 12 4 -122 0 0 - 3 13 3 5 3 5 81 299 -44 - 2 47 45 - 3 38 22 - 2 1 18 - 4 25 4 -121 0 0 - 2 26 19 5 2 34 81 292 -46 - 2 1 4 - 2 51 36 - 1 14 41 - 3 38 12 -120 0 0 - 1 39 44 5 2 3 80 286 -47 - 1 14 32 - 2 4 59 - 0 28 14 - 2 51 30 -119 0 0 - 0 53 22 5 1 31 80 281 -48 - 0 28 12 - 1 18 33 0 18 1 - 2 4 59 -118 0 0 - 0 7 12 5 1 0 79 276 -49 0 17 55 - 0 32 20 1 4 2 - 1 18 40 -117 0 0 0 38 45 5 0 29 78 272 -50 1 3 48 0 13 39 1 49 50 - 0 32 35 -116 0 0 1 24 25 4 59 58 77 268 -51 1 49 26 0 59 24 2 35 21 0 13 15 -115 0 0 2 9 50 4 59 28 76 265 -52 2 34 47 1 44 52 3 20 36 0 58 50 -114 0 0 2 54 57 4 58 57 76 263 -53 3 19 50 2 30 2 4 5 33 1 44 7 -113 0 0 3 39 45 4 58 27 75 261 -54 4 4 34 3 14 54 4 50 11 2 29 5 -112 0 0 4 24 13 4 57 57 74 259 -55 4 48 58 3 59 25 5 34 28 3 13 44 -111 0 0 5 8 19 4 57 27 73 257 -56 5 33 1 4 43 36 6 18 24 3 58 3 -110 0 0 5 52 4 4 56 58 72 256 -58 6 16 42 5 27 25 7 1 57 4 41 59 -109 0 0 6 35 26 4 56 28 70 254 -59 6 59 59 6 10 51 7 45 7 5 25 32 -108 0 0 7 18 23 4 55 59 69 253 -60 7 42 52 6 53 52 8 27 52 6 8 42 -107 0 0 8 0 55 4 55 31 68 252 -61 8 25 20 7 36 28 9 10 12 6 51 26 -106 0 0 8 43 1 4 55 3 67 251 -62 9 7 21 8 18 39 9 52 5 7 33 45 -105 0 0 9 24 40 4 54 35 66 251 -63 9 48 56 9 0 22 10 33 31 8 15 37 -104 0 0 10 5 51 4 54 7 65 250 -64 10 30 2 9 41 38 11 14 29 8 57 1 -103 0 0 10 46 33 4 53 40 64 249 -65 11 10 40 10 22 25 11 54 58 9 37 57 -102 0 0 11 26 46 4 53 13 63 249 -66 11 50 48 11 2 43 12 34 58 10 18 24 -101 0 0 12 6 29 4 52 46 62 249 -67 12 30 26 11 42 31 13 14 27 10 58 21 -100 0 0 12 45 41 4 52 20 61 248 -68 13 9 33 12 21 47 13 53 25 11 37 47 - 99 0 0 13 24 21 4 51 55 60 248 -69 13 48 8 13 0 33 14 31 51 12 16 41 - 98 0 0 14 2 29 4 51 29 59 248 -70 14 26 11 13 38 46 15 9 45 12 55 4 - 97 0 0 14 40 5 4 51 4 58 248 -70 15 3 42 14 16 27 15 47 6 13 32 54 - 96 0 0 15 17 7 4 50 40 57 247 -71 15 40 39 14 53 34 16 23 54 14 10 11 - 95 0 0 15 53 35 4 50 16 56 247 -72 16 17 2 15 30 8 17 0 8 14 46 54 - 94 0 0 16 29 30 4 49 52 55 247 -73 16 52 51 16 6 7 17 35 47 15 23 3 - 93 0 0 17 4 49 4 49 29 54 247 -74 17 28 5 16 41 32 18 10 52 15 58 37 - 92 0 0 17 39 33 4 49 6 53 247 -75 18 2 45 17 16 21 18 45 22 16 33 37 - 91 0 0 18 13 42 4 48 44 52 247 -76 18 36 48 17 50 35 19 19 16 17 8 1 - 90 0 0 18 47 16 4 48 22 51 247 -76 19 10 16 18 24 14 19 52 34 17 41 49 - 89 0 0 19 20 13 4 48 1 50 247 -77 19 43 8 18 57 16 20 25 16 18 15 1 - 88 0 0 19 52 34 4 47 40 49 248 -78 20 15 24 19 29 42 20 57 22 18 47 37 - 87 0 0 20 24 18 4 47 19 48 248 -78 20 47 3 20 1 32 21 28 51 19 19 36 - 86 0 0 20 55 25 4 46 59 47 248 -79 21 18 5 20 32 45 21 59 44 19 50 59 - 85 0 0 21 25 56 4 46 40 46 248 -79 21 48 30 21 3 21 22 30 0 20 21 44 - 84 0 0 21 55 49 4 46 20 45 248 -80 22 18 18 21 33 19 22 59 38 20 51 53 - 83 0 0 22 25 5 4 46 2 44 248 -80 22 47 29 22 2 41 23 28 40 21 21 24 - 82 0 0 22 53 44 4 45 43 43 249 -80 23 16 3 22 31 25 23 57 4 21 50 17 - 81 0 0 23 21 46 4 45 25 42 249 -80 23 43 59 22 59 32 24 24 51 22 18 34 - 80 0 0 23 49 10 4 45 8 41 249 -80 24 11 18 23 27 1 24 52 0 22 46 12 - 79 0 0 24 15 57 4 44 51 40 249 -80 24 38 0 23 53 52 25 18 32 23 13 13 - 78 0 0 24 42 6 4 44 35 39 250 -80 25 4 4 24 20 7 25 44 27 23 39 37 - 77 0 0 25 7 38 4 44 18 38 250 -80 25 29 31 24 45 43 26 9 45 24 5 23 - 76 0 0 25 32 32 4 44 3 37 250 -80 25 54 20 25 10 42 26 34 25 24 30 31 - 75 0 0 25 56 49 4 43 47 36 251 -79 26 18 32 25 35 4 26 58 28 24 55 2 - 74 0 0 26 20 28 4 43 33 35 251 -79 26 42 7 25 58 48 27 21 54 25 18 55 - 73 0 0 26 43 30 4 43 18 34 251 -78 27 5 4 26 21 55 27 44 43 25 42 10 - 72 0 0 27 5 55 4 43 4 33 252 -78 27 27 24 26 44 25 28 6 54 26 4 48 - 71 0 0 27 27 43 4 42 51 33 252 -77 27 49 8 27 6 17 28 28 29 26 26 49 - 70 0 0 27 48 54 4 42 37 32 253 -77 28 10 14 27 27 33 28 49 27 26 48 13 - 69 0 0 28 9 27 4 42 25 31 253 -76 28 30 43 27 48 11 29 9 48 27 8 59 - 68 0 0 28 29 24 4 42 12 30 253 -75 28 50 36 28 8 12 29 29 33 27 29 8 - 67 0 0 28 48 45 4 42 0 29 254 -75 29 9 52 28 27 37 29 48 41 27 48 41 - 66 0 0 29 7 28 4 41 49 28 254 -74 29 28 32 28 46 25 30 7 13 28 7 36 - 65 0 0 29 25 36 4 41 38 27 255 -73 29 46 35 29 4 36 30 25 9 28 25 55 - 64 0 0 29 43 7 4 41 27 26 255 -73 30 4 2 29 22 11 30 42 29 28 43 37 - 63 0 0 30 0 2 4 41 16 25 255 -72 30 20 53 29 39 9 30 59 13 29 0 43 - 62 0 0 30 16 20 4 41 6 25 256 -71 30 37 8 29 55 32 31 15 21 29 17 13 - 61 0 0 30 32 3 4 40 57 24 256 -70 30 52 47 30 11 18 31 30 53 29 33 6 - 60 0 0 30 47 10 4 40 47 23 257 -70 31 7 51 30 26 29 31 45 50 29 48 23 - 59 0 0 31 1 42 4 40 38 22 257 -69 31 22 18 30 41 4 32 0 12 30 3 4 - 58 0 0 31 15 37 4 40 30 21 258 -68 31 36 11 30 55 3 32 13 59 30 17 9 - 57 0 0 31 28 58 4 40 21 20 258 -67 31 49 28 31 8 27 32 27 10 30 30 38 - 56 0 0 31 41 43 4 40 14 19 259 -67 32 2 11 31 21 15 32 39 47 30 43 32 - 55 0 0 31 53 53 4 40 6 19 259 -66 32 14 18 31 33 28 32 51 48 30 55 51 - 54 0 0 32 5 28 4 39 59 18 260 -65 32 25 50 31 45 6 33 3 15 31 7 34 - 53 0 0 32 16 28 4 39 52 17 260 -64 32 36 47 31 56 8 33 14 8 31 18 41 - 52 0 0 32 26 53 4 39 45 16 261 -64 32 47 10 32 6 36 33 24 26 31 29 13 - 51 0 0 32 36 44 4 39 39 15 261 -63 32 56 58 32 16 29 33 34 9 31 39 11 - 50 0 0 32 45 59 4 39 33 14 262 -62 33 6 11 32 25 47 33 43 19 31 48 33 - 49 0 0 32 54 40 4 39 28 14 262 -61 33 14 50 32 34 30 33 51 54 31 57 20 - 48 0 0 33 2 47 4 39 23 13 263 -60 33 22 55 32 42 38 33 59 54 32 5 32 - 47 0 0 33 10 19 4 39 18 12 263 -60 33 30 25 32 50 12 34 7 21 32 13 9 - 46 0 0 33 17 16 4 39 14 11 264 -59 33 37 21 32 57 11 34 14 14 32 20 12 - 45 0 0 33 23 40 4 39 9 10 264 -58 33 43 42 33 3 36 34 20 32 32 26 39 - 44 0 0 33 29 28 4 39 5 9 265 -57 33 49 29 33 9 26 34 26 17 32 32 32 - 43 0 0 33 34 42 4 39 2 9 266 -57 33 54 42 33 14 42 34 31 28 32 37 50 - 42 0 0 33 39 22 4 38 59 8 266 -56 33 59 21 33 19 23 34 36 4 32 42 32 - 41 0 0 33 43 28 4 38 56 7 267 -55 34 3 25 33 23 29 34 40 7 32 46 41 - 40 0 0 33 46 59 4 38 53 6 267 -54 34 6 56 33 27 1 34 43 36 32 50 14 - 39 0 0 33 49 55 4 38 51 5 268 -54 34 9 51 33 29 58 34 46 30 32 53 12 - 38 0 0 33 52 17 4 38 49 4 268 -53 34 12 13 33 32 20 34 48 50 32 55 35 - 37 0 0 33 54 4 4 38 48 4 269 -52 34 13 59 33 34 7 34 50 37 32 57 23 - 36 0 0 33 55 16 4 38 46 3 269 -51 34 15 12 33 35 20 34 51 48 32 58 36 - 35 0 0 33 55 54 4 38 45 2 270 -50 34 15 49 33 35 57 34 52 26 32 59 13 - 34 0 0 33 55 56 4 38 45 1 270 -50 34 15 52 33 36 0 34 52 29 32 59 15 - 33 0 0 33 55 23 4 38 45 0 271 -49 34 15 19 33 35 27 34 51 57 32 58 42 Uncertainty in time = +/- 17 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 0577-00861-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 16 11.8964 DE: +00 55 21.443 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .032, .031 ) * V mag [mag]: 11.3 * B mag [mag]: 12.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (465) Alekto approx. diameter [km]: 73 approx. diameter ["]: .036 distance from Earth [AU]: 2.78700 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1562 number of rejected observations: 77 time covered by the observations: 1901 Jan 19 - 2012 Oct 23 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.010, 64° remarks: * orbital elements for (465) Alekto : Mean anomaly = 120.07302712 deg Arg. of pericenter = 284.28486058 deg Long. of node = 300.67823852 deg Inclination = 4.65686715 deg Eccentricity = 0.20937647 Semimajor axis = 3.08839373 AU Perihelion dist = 2.44175676 AU Mag: H = 9.75, G = 0.15 Epoch of elements : MJD 56234.21100000 TDT (2012 Nov 03.211) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 3 465 Alekto 5h 4.3m UT 11.3 23 16 11.896 0 55 21.44TYC 0577-00861-1 12.3 15.5 73 17.7 2.787 -0.362 -4.87 -129.8941 0.924 99.82 -15.18 5.0719 0.09361 -0.10453 -1.72750 -1.54669 0.00437 0.00149 2000 119.30832820121030.00000284.284861300.678239 4.6568670.20937647 3.0883937 2.4417568 9.8 5.00.15 RATE 1.8159550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.032 87 1.92 0.033 0 0 4 3 056226.0020121103_0861-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org