IOTA/IOTA-ES occultation update for (1320) Impala / TYC 6422-00966-1 event on 2007 Oct 04, 07:42 UT Visible from Caribbean, Venezuela, Colombia, Central America Summary ------- On 2007 Oct 04 UT, the 40 km diameter asteroid (1320) Impala will occult a 10.5 mag star in the constellation Sculptor for observers along a path across Caribbean, Venezuela, Colombia, Central America. 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 3.2 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: 50 * date and approx. time of event: 2007 Oct 04, 07:32 - 2007 Oct 04, 07:47 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 3.2 * Moon: 41 % sunlit, 108° distance * Sun: 151° distance * rough path description: Caribbean, Venezuela, Colombia, Central America The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 1.28 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .037", 62° ) * approx speed of asteroid's shadow [km/s]: 12.3228 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6422-00966-1 by 1320 Impala on 2007 Oct 04 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 166 0 0 22 12 41 7 47 35 1 117 -16 22 26 30 21 58 54 23 2 1 .. .. .. 167 0 0 21 44 26 7 47 35 2 118 -17 21 58 13 21 30 40 22 33 41 .. .. .. 168 0 0 21 16 19 7 47 34 3 118 -18 21 30 5 21 2 35 22 5 29 .. .. .. 169 0 0 20 48 21 7 47 33 4 118 -19 21 2 5 20 34 38 21 37 26 .. .. .. 170 0 0 20 20 33 7 47 33 5 119 -20 20 34 16 20 6 52 21 9 32 19 31 58 171 0 0 19 52 56 7 47 32 6 119 -21 20 6 37 19 39 16 20 41 49 19 4 26 172 0 0 19 25 30 7 47 30 7 119 -22 19 39 10 19 11 52 20 14 18 18 37 6 173 0 0 18 58 16 7 47 29 8 120 -23 19 11 54 18 44 39 19 46 58 18 9 58 174 0 0 18 31 15 7 47 27 9 120 -24 18 44 52 18 17 40 19 19 51 17 43 3 175 0 0 18 4 28 7 47 26 10 120 -25 18 18 3 17 50 54 18 52 58 17 16 21 176 0 0 17 37 54 7 47 24 11 121 -26 17 51 28 17 24 23 18 26 18 16 49 54 177 0 0 17 11 36 7 47 22 12 121 -27 17 25 8 16 58 6 17 59 54 16 23 42 178 0 0 16 45 33 7 47 19 13 121 -28 16 59 3 16 32 5 17 33 45 15 57 45 179 0 0 16 19 46 7 47 17 14 122 -29 16 33 14 16 6 20 17 7 52 15 32 5 180 0 0 15 54 16 7 47 14 15 122 -30 16 7 43 15 40 52 16 42 15 15 6 41 -179 0 0 15 29 4 7 47 11 16 122 -31 15 42 28 15 15 41 16 16 56 14 41 35 -178 0 0 15 4 9 7 47 8 17 123 -32 15 17 31 14 50 48 15 51 54 14 16 46 -177 0 0 14 39 32 7 47 5 18 123 -33 14 52 53 14 26 13 15 27 11 13 52 16 -176 0 0 14 15 15 7 47 1 19 123 -34 14 28 34 14 1 58 15 2 47 13 28 5 -175 0 0 13 51 17 7 46 58 20 124 -35 14 4 34 13 38 1 14 38 42 13 4 13 -174 0 0 13 27 39 7 46 54 21 124 -35 13 40 54 13 14 25 14 14 57 12 40 42 -173 0 0 13 4 21 7 46 50 22 124 -36 13 17 34 12 51 9 13 51 33 12 17 30 -172 0 0 12 41 24 7 46 46 23 124 -37 12 54 35 12 28 14 13 28 29 11 54 40 -171 0 0 12 18 48 7 46 42 25 125 -38 12 31 57 12 5 40 13 5 47 11 32 11 -170 0 0 11 56 34 7 46 37 25 125 -39 12 9 41 11 43 28 12 43 26 11 10 3 -169 0 0 11 34 42 7 46 33 26 125 -40 11 47 47 11 21 37 12 21 27 10 48 17 -168 0 0 11 13 12 7 46 28 27 126 -41 11 26 16 11 0 9 11 59 51 10 26 54 -167 0 0 10 52 5 7 46 23 28 126 -42 11 5 7 10 39 4 11 38 37 10 5 53 -166 0 0 10 31 21 7 46 18 29 126 -43 10 44 22 10 18 22 11 17 47 9 45 16 -165 0 0 10 11 1 7 46 13 30 127 -44 10 23 59 9 58 4 10 57 20 9 25 2 -164 0 0 9 51 4 7 46 8 31 127 -45 10 4 1 9 38 9 10 37 17 9 5 11 -163 0 0 9 31 31 7 46 2 32 128 -46 9 44 27 9 18 38 10 17 38 8 45 45 -162 0 0 9 12 23 7 45 57 33 128 -47 9 25 16 8 59 31 9 58 24 8 26 42 -161 0 0 8 53 39 7 45 51 34 128 -48 9 6 31 8 40 49 9 39 34 8 8 5 -160 0 0 8 35 20 7 45 45 35 129 -49 8 48 10 8 22 32 9 21 9 7 49 51 -159 0 0 8 17 26 7 45 39 36 129 -50 8 30 15 8 4 39 9 3 9 7 32 3 -158 0 0 7 59 57 7 45 33 37 130 -51 8 12 44 7 47 12 8 45 34 7 14 40 -157 0 0 7 42 54 7 45 27 38 130 -52 7 55 39 7 30 11 8 28 25 6 57 42 -156 0 0 7 26 17 7 45 20 39 130 -53 7 39 0 7 13 34 8 11 42 6 41 10 -155 0 0 7 10 5 7 45 14 40 131 -54 7 22 47 6 57 24 7 55 25 6 25 4 -154 0 0 6 54 19 7 45 7 41 131 -55 7 7 0 6 41 40 7 39 34 6 9 23 -153 0 0 6 38 59 7 45 1 42 132 -56 6 51 38 6 26 22 7 24 9 5 54 9 -152 0 0 6 24 6 7 44 54 42 132 -57 6 36 44 6 11 30 7 9 10 5 39 21 -151 0 0 6 9 39 7 44 47 43 133 -58 6 22 15 5 57 4 6 54 38 5 24 59 -150 0 0 5 55 39 7 44 40 44 134 -59 6 8 14 5 43 5 6 40 33 5 11 3 -149 0 0 5 42 5 7 44 33 45 134 -60 5 54 39 5 29 33 6 26 55 4 57 34 -148 0 0 5 28 58 7 44 26 46 135 -61 5 41 31 5 16 27 6 13 43 4 44 32 -147 0 0 5 16 18 7 44 19 47 135 -62 5 28 49 5 3 49 6 0 59 4 31 56 -146 0 0 5 4 5 7 44 11 48 136 -63 5 16 35 4 51 37 5 48 42 4 19 47 -145 0 0 4 52 20 7 44 4 48 137 -64 5 4 48 4 39 52 5 36 52 4 8 6 -144 0 0 4 41 1 7 43 56 49 138 -65 4 53 29 4 28 35 5 25 29 3 56 51 -143 0 0 4 30 10 7 43 49 50 138 -66 4 42 36 4 17 45 5 14 34 3 46 4 -142 0 0 4 19 46 7 43 41 51 139 -67 4 32 11 4 7 22 5 4 6 3 35 43 -141 0 0 4 9 49 7 43 33 51 140 -68 4 22 13 3 57 26 4 54 6 3 25 50 -140 0 0 4 0 20 7 43 25 52 141 -69 4 12 43 3 47 58 4 44 33 3 16 24 -139 0 0 3 51 18 7 43 17 53 142 -70 4 3 41 3 38 57 4 35 28 3 7 26 -138 0 0 3 42 44 7 43 10 54 143 -71 3 55 6 3 30 24 4 26 51 2 58 55 -137 0 0 3 34 37 7 43 2 54 144 -72 3 46 58 3 22 18 4 18 41 2 50 51 -136 0 0 3 26 59 7 42 53 55 145 -73 3 39 19 3 14 40 4 11 0 2 43 15 -135 0 0 3 19 47 7 42 45 56 146 -73 3 32 7 3 7 29 4 3 46 2 36 6 -134 0 0 3 13 4 7 42 37 56 147 -74 3 25 22 3 0 46 3 57 0 2 29 25 -133 0 0 3 6 48 7 42 29 57 148 -75 3 19 6 2 54 31 3 50 42 2 23 12 -132 0 0 3 1 0 7 42 21 57 150 -76 3 13 17 2 48 44 3 44 52 2 17 26 -131 0 0 2 55 40 7 42 12 58 151 -77 3 7 57 2 43 24 3 39 29 2 12 7 -130 0 0 2 50 47 7 42 4 59 152 -78 3 3 4 2 38 32 3 34 35 2 7 17 -129 0 0 2 46 23 7 41 56 59 154 -79 2 58 38 2 34 8 3 30 9 2 2 53 -128 0 0 2 42 26 7 41 47 59 155 -80 2 54 41 2 30 12 3 26 10 1 58 58 -127 0 0 2 38 57 7 41 39 60 157 -81 2 51 12 2 26 43 3 22 40 1 55 30 -126 0 0 2 35 56 7 41 30 60 158 -82 2 48 10 2 23 42 3 19 38 1 52 30 -125 0 0 2 33 22 7 41 22 61 160 -83 2 45 37 2 21 9 3 17 4 1 49 58 -124 0 0 2 31 17 7 41 13 61 161 -84 2 43 31 2 19 4 3 14 57 1 47 53 -123 0 0 2 29 39 7 41 4 61 163 -85 2 41 53 2 17 26 3 13 19 1 46 16 -122 0 0 2 28 30 7 40 56 62 165 -86 2 40 44 2 16 17 3 12 9 1 45 7 -121 0 0 2 27 48 7 40 47 62 167 -86 2 40 2 2 15 35 3 11 27 1 44 26 -120 0 0 2 27 34 7 40 39 62 168 -87 2 39 48 2 15 21 3 11 13 1 44 12 -119 0 0 2 27 48 7 40 30 62 170 -88 2 40 2 2 15 35 3 11 27 1 44 26 -118 0 0 2 28 29 7 40 21 62 172 -88 2 40 43 2 16 17 3 12 9 1 45 7 -117 0 0 2 29 39 7 40 12 63 174 -88 2 41 53 2 17 26 3 13 19 1 46 16 -116 0 0 2 31 16 7 40 4 63 176 -87 2 43 31 2 19 4 3 14 57 1 47 53 -115 0 0 2 33 22 7 39 55 63 178 -87 2 45 36 2 21 9 3 17 3 1 49 58 -114 0 0 2 35 55 7 39 46 63 180 -86 2 48 10 2 23 41 3 19 37 1 52 30 -113 0 0 2 38 56 7 39 38 63 182 -85 2 51 11 2 26 42 3 22 39 1 55 30 -112 0 0 2 42 24 7 39 29 62 183 -84 2 54 40 2 30 10 3 26 9 1 58 57 -111 0 0 2 46 21 7 39 20 62 185 -83 2 58 36 2 34 6 3 30 6 2 2 52 -110 0 0 2 50 45 7 39 12 62 187 -82 3 3 1 2 38 30 3 34 32 2 7 15 -109 0 0 2 55 37 7 39 3 62 189 -81 3 7 53 2 43 21 3 39 26 2 12 5 -108 0 0 3 0 56 7 38 54 62 191 -80 3 13 13 2 48 40 3 44 47 2 17 23 -107 0 0 3 6 43 7 38 46 61 193 -79 3 19 1 2 54 27 3 50 36 2 23 8 -106 0 0 3 12 58 7 38 37 61 194 -79 3 25 16 3 0 41 3 56 53 2 29 20 -105 0 0 3 19 40 7 38 28 61 196 -78 3 31 59 3 7 23 4 3 38 2 36 0 -104 0 0 3 26 50 7 38 20 60 198 -77 3 39 10 3 14 32 4 10 50 2 43 8 -103 0 0 3 34 28 7 38 11 60 199 -76 3 46 48 3 22 8 4 18 30 2 50 42 -102 0 0 3 42 33 7 38 3 59 201 -75 3 54 54 3 30 13 4 26 38 2 58 44 -101 0 0 3 51 5 7 37 54 59 202 -74 4 3 27 3 38 44 4 35 14 3 7 14 -100 0 0 4 0 4 7 37 46 58 204 -73 4 12 27 3 47 43 4 44 16 3 16 10 - 99 0 0 4 9 31 7 37 37 58 205 -72 4 21 55 3 57 9 4 53 47 3 25 34 - 98 0 0 4 19 25 7 37 29 57 206 -71 4 31 50 4 7 2 5 3 44 3 35 25 - 97 0 0 4 29 47 7 37 21 57 208 -70 4 42 13 4 17 22 5 14 9 3 45 42 - 96 0 0 4 40 35 7 37 12 56 209 -69 4 53 2 4 28 10 5 25 1 3 56 27 - 95 0 0 4 51 51 7 37 4 55 210 -68 5 4 19 4 39 24 5 36 21 4 7 39 - 94 0 0 5 3 33 7 36 56 55 211 -67 5 16 2 4 51 5 5 48 7 4 19 17 - 93 0 0 5 15 42 7 36 48 54 212 -66 5 28 13 5 3 13 6 0 21 4 31 22 - 92 0 0 5 28 18 7 36 40 53 213 -65 5 40 50 5 15 48 6 13 1 4 43 54 - 91 0 0 5 41 21 7 36 32 53 214 -64 5 53 54 5 28 49 6 26 8 4 56 52 - 90 0 0 5 54 50 7 36 24 52 215 -63 6 7 24 5 42 17 6 39 42 5 10 16 - 89 0 0 6 8 45 7 36 16 51 216 -62 6 21 21 5 56 11 6 53 42 5 24 7 - 88 0 0 6 23 7 7 36 8 51 217 -61 6 35 44 6 10 31 7 8 9 5 38 24 - 87 0 0 6 37 55 7 36 0 50 218 -60 6 50 33 6 25 18 7 23 2 5 53 7 - 86 0 0 6 53 9 7 35 53 49 219 -59 7 5 49 6 40 30 7 38 21 6 8 16 - 85 0 0 7 8 48 7 35 45 48 219 -58 7 21 30 6 56 9 7 54 6 6 23 51 - 84 0 0 7 24 54 7 35 37 47 220 -57 7 37 37 7 12 13 8 10 16 6 39 51 - 83 0 0 7 41 25 7 35 30 46 221 -56 7 54 9 7 28 42 8 26 53 6 56 16 - 82 0 0 7 58 21 7 35 23 46 222 -55 8 11 7 7 45 37 8 43 55 7 13 7 - 81 0 0 8 15 42 7 35 15 45 222 -54 8 28 30 8 2 57 9 1 22 7 30 23 - 80 0 0 8 33 29 7 35 8 44 223 -53 8 46 18 8 20 41 9 19 14 7 48 3 - 79 0 0 8 51 40 7 35 1 43 224 -52 9 4 30 8 38 51 9 37 31 8 6 9 - 78 0 0 9 10 15 7 34 54 42 224 -51 9 23 7 8 57 24 9 56 12 8 24 38 - 77 0 0 9 29 15 7 34 48 41 225 -50 9 42 9 9 16 22 10 15 18 8 43 32 - 76 0 0 9 48 38 7 34 41 40 225 -50 10 1 34 9 35 44 10 34 47 9 2 50 - 75 0 0 10 8 25 7 34 34 39 226 -49 10 21 23 9 55 30 10 54 41 9 22 31 - 74 0 0 10 28 36 7 34 28 39 226 -48 10 41 35 10 15 39 11 14 58 9 42 35 - 73 0 0 10 49 10 7 34 21 38 227 -47 11 2 11 10 36 11 11 35 38 10 3 3 - 72 0 0 11 10 6 7 34 15 37 227 -46 11 23 9 10 57 5 11 56 41 10 23 53 - 71 0 0 11 31 25 7 34 9 36 228 -45 11 44 30 11 18 22 12 18 6 10 45 6 - 70 0 0 11 53 6 7 34 3 35 228 -44 12 6 13 11 40 2 12 39 53 11 6 40 - 69 0 0 12 15 9 7 33 57 34 229 -43 12 28 17 12 2 3 13 2 3 11 28 37 - 68 0 0 12 37 33 7 33 51 33 229 -42 12 50 43 12 24 25 13 24 33 11 50 54 - 67 0 0 13 0 18 7 33 46 32 230 -41 13 13 30 12 47 8 13 47 25 12 13 33 - 66 0 0 13 23 24 7 33 40 31 230 -40 13 36 37 13 10 12 14 10 37 12 36 32 - 65 0 0 13 46 49 7 33 35 30 230 -39 14 0 5 13 33 35 14 34 9 12 59 51 - 64 0 0 14 10 34 7 33 30 29 231 -38 14 23 52 13 57 19 14 58 1 13 23 30 - 63 0 0 14 34 39 7 33 25 28 231 -37 14 47 58 14 21 21 15 22 12 13 47 28 - 62 0 0 14 59 2 7 33 20 27 232 -36 15 12 23 14 45 43 15 46 41 14 11 45 - 61 0 0 15 23 43 7 33 16 26 232 -35 15 37 6 15 10 22 16 11 29 14 36 20 - 60 0 0 15 48 42 7 33 11 25 232 -34 16 2 7 15 35 19 16 36 34 15 1 12 - 59 0 0 16 13 58 7 33 7 24 233 -33 16 27 24 16 0 33 17 1 57 15 26 22 - 58 0 0 16 39 30 7 33 3 23 233 -32 16 52 59 16 26 4 17 27 36 15 51 48 - 57 0 0 17 5 19 7 32 59 22 233 -31 17 18 49 16 51 51 17 53 30 16 17 31 - 56 0 0 17 31 23 7 32 55 21 234 -30 17 44 54 17 17 53 18 19 40 16 43 28 - 55 0 0 17 57 41 7 32 51 20 234 -29 18 11 14 17 44 10 18 46 5 17 9 41 - 54 0 0 18 24 14 7 32 48 19 235 -28 18 37 49 18 10 41 19 12 44 17 36 8 - 53 0 0 18 51 0 7 32 44 18 235 -27 19 4 37 18 37 25 19 39 36 18 2 48 - 52 0 0 19 17 59 7 32 41 17 235 -26 19 31 37 19 4 22 20 6 40 18 29 41 - 51 0 0 19 45 10 7 32 38 16 236 -25 19 58 50 19 31 32 20 33 57 18 56 47 - 50 0 0 20 12 32 7 32 35 15 236 -24 20 26 13 19 58 53 21 1 25 19 24 4 - 49 0 0 20 40 5 7 32 33 14 236 -23 20 53 48 20 26 24 21 29 3 19 51 31 - 48 0 0 21 7 48 7 32 30 13 237 -22 21 21 32 20 54 6 21 56 51 20 19 9 - 47 0 0 21 35 40 7 32 28 12 237 -21 21 49 26 21 21 57 22 24 49 20 46 56 - 46 0 0 22 3 41 7 32 26 11 238 -20 22 17 28 21 49 56 22 52 54 21 14 52 - 45 0 0 22 31 49 7 32 24 10 238 -19 22 45 37 22 18 3 23 21 7 21 42 56 - 44 0 0 23 0 4 7 32 23 9 238 -18 23 13 54 22 46 17 23 49 27 22 11 7 - 43 0 0 23 28 25 7 32 21 8 239 -17 23 42 16 23 14 37 24 17 52 22 39 24 - 42 0 0 23 56 52 7 32 20 7 239 -16 24 10 44 23 43 2 24 46 23 23 7 46 - 41 0 0 24 25 23 7 32 19 6 240 -16 24 39 16 24 11 32 25 14 58 23 36 14 - 40 0 0 24 53 58 7 32 18 5 240 -15 25 7 52 24 40 6 25 43 36 24 4 45 - 39 0 0 25 22 35 7 32 17 4 240 -14 25 36 30 25 8 42 26 12 17 .. .. .. - 38 0 0 25 51 15 7 32 17 3 241 -13 26 5 10 25 37 21 26 40 59 .. .. .. - 37 0 0 26 19 55 7 32 16 1 241 -12 26 33 52 26 6 1 27 9 43 .. .. .. - 36 0 0 26 48 36 7 32 16 0 242 -11 27 2 34 26 34 41 27 38 27 .. .. .. Data for the target star ------------------------ * name: TYC 6422-00966-1 * constellation : Sculptor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 54 25.7245 DE: -24 50 37.855 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 10.5 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1320) Impala approx. diameter [km]: 40 approx. diameter ["]: .030 distance from Earth [AU]: 1.86800 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 652 number of rejected observations: 24 time covered by the observations: 1934 May 13 - 2007 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.030, 56° remarks: * orbital elements for (1320) Impala : Mean anomaly = 60.47593884 deg Arg. of pericenter = 204.96403792 deg Long. of node = 72.19655363 deg Inclination = 19.86383825 deg Eccentricity = 0.23424307 Semimajor axis = 2.98458241 AU Perihelion dist = 2.28546465 AU Mag: H = 10.84, G = 0.15 Epoch of elements : MJD 54377.32100000 TDT (2007 Oct 04.321) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 04 1320 Impala 7h 39.9m UT 10.5 0 54 25.725-24 50 37.86TYC 6422-00966-1 11.3 14.6 40 3.2 1.868 -2.403 -1.41 -113.996 -24.843 62.24 -4.24 7.6654 -.02000 .45912 -6.94877 -0.30259 -0.00042 0.00277 2000 59.07651562007 927.00000204.964038 72.196554 19.8638380.234243072.984582412.2854646510.45 0.15 RATE 1.9115194 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.045 0.037 62.4 2.280 0.038 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org