IOTA/IOTA-ES occultation update for (554) Peraga / 2UCAC 23257408 event on 2009 Jul 01, 03:21 UT Visible from Africa, SE USA Summary ------- On 2009 Jul 01 UT, the 96 km diameter asteroid (554) Peraga will occult a 13.4 mag star in the constellation Sagittarius for observers along a path across Africa, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 12.5 mag (the magnitude of the asteroid) for at most 8.9 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: 43 * date and approx. time of event: 2009 Jul 01, 03:14 - 2009 Jul 01, 03:28 UT * magnitude of target star: 13.4 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 8.9 * Moon: 66 % sunlit, 85° distance * Sun: 165° distance * rough path description: Africa, SE USA The occultation path -------------------- * approximate projected width [km]: 139 * 1 sigma uncertainty interval [path widths]: +/- 1.51 * 1 sigma uncertainty interval [seconds]: +/- 12.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .126 +/- .126) * 1 sigma uncertainty ellipse (major, minor, PA): ( .126", .126", 90° ) * approx speed of asteroid's shadow [km/s]: 10.7955 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 23257408 by 554 Peraga on 2009 Jul 1 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 37 5 6 3 28 13 0 118 -10 37 48 28 36 22 23 .. .. .. .. .. .. -106 0 0 36 39 56 3 28 12 1 119 -11 37 23 9 35 57 21 .. .. .. .. .. .. -105 0 0 36 15 1 3 28 12 2 119 -12 36 58 5 35 32 35 39 12 20 .. .. .. -104 0 0 35 50 23 3 28 11 3 120 -13 36 33 18 35 8 5 38 47 2 .. .. .. -103 0 0 35 26 2 3 28 11 4 120 -14 36 8 48 34 43 53 38 22 2 .. .. .. -102 0 0 35 1 59 3 28 10 5 121 -15 35 44 36 34 19 59 37 57 20 .. .. .. -101 0 0 34 38 14 3 28 8 6 122 -15 35 20 42 33 56 23 37 32 57 .. .. .. -100 0 0 34 14 49 3 28 7 7 122 -16 34 57 8 33 33 6 37 8 53 .. .. .. - 99 0 0 33 51 43 3 28 5 8 123 -17 34 33 53 33 10 9 36 45 8 .. .. .. - 98 0 0 33 28 58 3 28 3 9 123 -18 34 10 59 32 47 32 36 21 45 30 45 41 - 97 0 0 33 6 33 3 28 1 9 124 -19 33 48 25 32 25 16 35 58 42 30 23 48 - 96 0 0 32 44 30 3 27 59 10 124 -20 33 26 14 32 3 22 35 36 1 30 2 17 - 95 0 0 32 22 49 3 27 56 11 125 -21 33 4 24 31 41 49 35 13 43 29 41 8 - 94 0 0 32 1 31 3 27 54 12 126 -21 32 42 57 31 20 38 34 51 47 29 20 21 - 93 0 0 31 40 35 3 27 51 13 126 -22 32 21 52 30 59 51 34 30 15 28 59 56 - 92 0 0 31 20 3 3 27 47 14 127 -23 32 1 12 30 39 27 34 9 7 28 39 54 - 91 0 0 30 59 54 3 27 44 15 127 -24 31 40 55 30 19 26 33 48 23 28 20 16 - 90 0 0 30 40 10 3 27 41 16 128 -25 31 21 3 29 59 50 33 28 4 28 1 2 - 89 0 0 30 20 50 3 27 37 17 128 -25 31 1 35 29 40 38 33 8 10 27 42 11 - 88 0 0 30 1 55 3 27 33 17 129 -26 30 42 32 29 21 50 32 48 41 27 23 45 - 87 0 0 29 43 26 3 27 29 18 130 -27 30 23 55 29 3 29 32 29 39 27 5 44 - 86 0 0 29 25 22 3 27 24 19 130 -28 30 5 44 28 45 32 32 11 2 26 48 8 - 85 0 0 29 7 45 3 27 20 20 131 -28 29 47 59 28 28 1 31 52 53 26 30 58 - 84 0 0 28 50 33 3 27 15 21 131 -29 29 30 40 28 10 57 31 35 10 26 14 13 - 83 0 0 28 33 48 3 27 10 22 132 -30 29 13 48 27 54 19 31 17 55 25 57 54 - 82 0 0 28 17 30 3 27 5 22 133 -31 28 57 23 27 38 7 31 1 7 25 42 1 - 81 0 0 28 1 39 3 27 0 23 133 -31 28 41 25 27 22 23 30 44 47 25 26 35 - 80 0 0 27 46 15 3 26 55 24 134 -32 28 25 55 27 7 6 30 28 55 25 11 35 - 79 0 0 27 31 19 3 26 49 25 135 -33 28 10 52 26 52 16 30 13 32 24 57 3 - 78 0 0 27 16 51 3 26 43 26 135 -33 27 56 18 26 37 53 29 58 37 24 42 57 - 77 0 0 27 2 50 3 26 38 26 136 -34 27 42 11 26 23 59 29 44 11 24 29 19 - 76 0 0 26 49 18 3 26 32 27 137 -35 27 28 33 26 10 32 29 30 13 24 16 8 - 75 0 0 26 36 14 3 26 25 28 137 -35 27 15 23 25 57 33 29 16 45 24 3 25 - 74 0 0 26 23 38 3 26 19 29 138 -36 27 2 42 25 45 3 29 3 46 23 51 9 - 73 0 0 26 11 31 3 26 13 29 139 -36 26 50 30 25 33 1 28 51 17 23 39 22 - 72 0 0 25 59 53 3 26 6 30 139 -37 26 38 47 25 21 28 28 39 17 23 28 2 - 71 0 0 25 48 44 3 25 59 31 140 -37 26 27 32 25 10 23 28 27 47 23 17 11 - 70 0 0 25 38 3 3 25 52 31 141 -38 26 16 47 24 59 47 28 16 47 23 6 47 - 69 0 0 25 27 52 3 25 45 32 142 -38 26 6 31 24 49 40 28 6 16 22 56 52 - 68 0 0 25 18 10 3 25 38 33 142 -39 25 56 45 24 40 2 27 56 16 22 47 26 - 67 0 0 25 8 57 3 25 31 33 143 -39 25 47 28 24 30 53 27 46 46 22 38 28 - 66 0 0 25 0 14 3 25 24 34 144 -40 25 38 41 24 22 13 27 37 46 22 29 59 - 65 0 0 24 51 59 3 25 16 35 145 -40 25 30 23 24 14 3 27 29 16 22 21 58 - 64 0 0 24 44 15 3 25 8 35 146 -40 25 22 35 24 6 22 27 21 17 22 14 26 - 63 0 0 24 37 0 3 25 1 36 147 -41 25 15 17 23 59 10 27 13 48 22 7 23 - 62 0 0 24 30 15 3 24 53 37 148 -41 25 8 29 23 52 27 27 6 50 22 0 49 - 61 0 0 24 23 59 3 24 45 37 149 -41 25 2 10 23 46 14 27 0 23 21 54 44 - 60 0 0 24 18 13 3 24 37 38 149 -42 24 56 22 23 40 31 26 54 26 21 49 7 - 59 0 0 24 12 57 3 24 29 38 150 -42 24 51 3 23 35 17 26 48 59 21 44 0 - 58 0 0 24 8 10 3 24 21 39 151 -42 24 46 14 23 30 33 26 44 4 21 39 22 - 57 0 0 24 3 54 3 24 12 39 152 -42 24 41 56 23 26 18 26 39 39 21 35 12 - 56 0 0 24 0 7 3 24 4 40 153 -43 24 38 7 23 22 33 26 35 45 21 31 32 - 55 0 0 23 56 50 3 23 56 40 154 -43 24 34 49 23 19 17 26 32 21 21 28 21 - 54 0 0 23 54 3 3 23 47 40 155 -43 24 32 0 23 16 32 26 29 28 21 25 39 - 53 0 0 23 51 46 3 23 39 41 157 -43 24 29 42 23 14 15 26 27 6 21 23 25 - 52 0 0 23 49 59 3 23 30 41 158 -43 24 27 54 23 12 29 26 25 15 21 21 41 - 51 0 0 23 48 41 3 23 21 42 159 -43 24 26 36 23 11 12 26 23 55 21 20 27 - 50 0 0 23 47 53 3 23 12 42 160 -43 24 25 48 23 10 25 26 23 5 21 19 41 - 49 0 0 23 47 36 3 23 4 42 161 -43 24 25 30 23 10 8 26 22 46 21 19 24 - 48 0 0 23 47 48 3 22 55 42 162 -43 24 25 42 23 10 20 26 22 58 21 19 36 - 47 0 0 23 48 30 3 22 46 43 163 -43 24 26 24 23 11 1 26 23 40 21 20 17 - 46 0 0 23 49 41 3 22 37 43 164 -43 24 27 36 23 12 13 26 24 54 21 21 28 - 45 0 0 23 51 23 3 22 28 43 166 -43 24 29 18 23 13 53 26 26 37 21 23 7 - 44 0 0 23 53 34 3 22 19 43 167 -43 24 31 29 23 16 4 26 28 52 21 25 15 - 43 0 0 23 56 14 3 22 10 43 168 -43 24 34 11 23 18 44 26 31 37 21 27 52 - 42 0 0 23 59 25 3 22 1 44 169 -42 24 37 23 23 21 53 26 34 53 21 30 58 - 41 0 0 24 3 5 3 21 52 44 171 -42 24 41 4 23 25 32 26 38 39 21 34 33 - 40 0 0 24 7 15 3 21 43 44 172 -42 24 45 16 23 29 40 26 42 55 21 38 37 - 39 0 0 24 11 54 3 21 34 44 173 -42 24 49 56 23 34 17 26 47 42 21 43 9 - 38 0 0 24 17 2 3 21 25 44 174 -41 24 55 7 23 39 23 26 52 59 21 48 10 - 37 0 0 24 22 40 3 21 16 44 175 -41 25 0 47 23 44 59 26 58 47 21 53 39 - 36 0 0 24 28 47 3 21 6 44 177 -41 25 6 57 23 51 4 27 5 4 21 59 38 - 35 0 0 24 35 24 3 20 57 44 178 -40 25 13 36 23 57 38 27 11 52 22 6 4 - 34 0 0 24 42 29 3 20 48 44 179 -40 25 20 44 24 4 41 27 19 10 22 12 59 - 33 0 0 24 50 4 3 20 39 43 180 -40 25 28 22 24 12 12 27 26 58 22 20 22 - 32 0 0 24 58 7 3 20 30 43 182 -39 25 36 29 24 20 13 27 35 15 22 28 14 - 31 0 0 25 6 40 3 20 21 43 183 -39 25 45 5 24 28 42 27 44 3 22 36 34 - 30 0 0 25 15 41 3 20 12 43 184 -38 25 54 10 24 37 39 27 53 20 22 45 21 - 29 0 0 25 25 11 3 20 3 43 185 -38 26 3 44 24 47 6 28 3 6 22 54 37 - 28 0 0 25 35 9 3 19 54 42 186 -37 26 13 46 24 57 0 28 13 22 23 4 20 - 27 0 0 25 45 36 3 19 45 42 188 -37 26 24 17 25 7 23 28 24 7 23 14 31 - 26 0 0 25 56 31 3 19 37 42 189 -36 26 35 17 25 18 14 28 35 21 23 25 10 - 25 0 0 26 7 55 3 19 28 41 190 -36 26 46 45 25 29 32 28 47 4 23 36 16 - 24 0 0 26 19 46 3 19 19 41 191 -35 26 58 41 25 41 19 28 59 16 23 47 49 - 23 0 0 26 32 5 3 19 10 41 192 -35 27 11 5 25 53 33 29 11 57 23 59 50 - 22 0 0 26 44 52 3 19 2 40 193 -34 27 23 57 26 6 15 29 25 6 24 12 17 - 21 0 0 26 58 6 3 18 53 40 194 -33 27 37 17 26 19 24 29 38 44 24 25 11 - 20 0 0 27 11 47 3 18 45 40 196 -33 27 51 4 26 33 0 29 52 49 24 38 32 - 19 0 0 27 25 56 3 18 36 39 197 -32 28 5 18 26 47 3 30 7 23 24 52 20 - 18 0 0 27 40 32 3 18 28 39 198 -31 28 20 0 27 1 33 30 22 24 25 6 33 - 17 0 0 27 55 34 3 18 20 38 199 -31 28 35 8 27 16 29 30 37 53 25 21 13 - 16 0 0 28 11 3 3 18 12 38 200 -30 28 50 43 27 31 52 30 53 48 25 36 18 - 15 0 0 28 26 57 3 18 4 37 201 -29 29 6 45 27 47 40 31 10 11 25 51 49 - 14 0 0 28 43 18 3 17 56 36 202 -29 29 23 12 28 3 55 31 27 0 26 7 46 - 13 0 0 29 0 5 3 17 48 36 203 -28 29 40 5 28 20 35 31 44 16 26 24 7 - 12 0 0 29 17 17 3 17 40 35 204 -27 29 57 24 28 37 40 32 1 58 26 40 53 - 11 0 0 29 34 54 3 17 33 35 204 -26 30 15 9 28 55 10 32 20 6 26 58 4 - 10 0 0 29 52 56 3 17 25 34 205 -26 30 33 18 29 13 5 32 38 39 27 15 39 - 9 0 0 30 11 22 3 17 18 33 206 -25 30 51 52 29 31 24 32 57 37 27 33 39 - 8 0 0 30 30 12 3 17 10 33 207 -24 31 10 50 29 50 7 33 17 0 27 52 1 - 7 0 0 30 49 27 3 17 3 32 208 -23 31 30 11 30 9 14 33 36 48 28 10 47 - 6 0 0 31 9 4 3 16 56 31 209 -22 31 49 57 30 28 44 33 56 59 28 29 56 - 5 0 0 31 29 5 3 16 49 31 210 -22 32 10 6 30 48 37 34 17 34 28 49 28 - 4 0 0 31 49 28 3 16 43 30 211 -21 32 30 37 31 8 52 34 38 32 29 9 21 - 3 0 0 32 10 14 3 16 36 29 211 -20 32 51 31 31 29 30 34 59 53 29 29 37 - 2 0 0 32 31 21 3 16 30 29 212 -19 33 12 46 31 50 29 35 21 35 29 50 14 - 1 0 0 32 52 49 3 16 23 28 213 -18 33 34 23 32 11 49 35 43 40 30 11 12 0 0 0 33 14 38 3 16 17 27 214 -17 33 56 21 32 33 31 36 6 6 30 32 30 1 0 0 33 36 48 3 16 11 26 215 -17 34 18 39 32 55 32 36 28 52 30 54 8 2 0 0 33 59 17 3 16 5 25 215 -16 34 41 17 33 17 53 36 51 59 31 16 6 3 0 0 34 22 6 3 16 0 25 216 -15 35 4 14 33 40 33 37 15 25 31 38 23 4 0 0 34 45 13 3 15 54 24 217 -14 35 27 30 34 3 32 37 39 9 32 0 59 5 0 0 35 8 38 3 15 49 23 218 -13 35 51 4 34 26 49 38 3 13 32 23 52 6 0 0 35 32 21 3 15 44 22 218 -12 36 14 56 34 50 24 38 27 33 32 47 3 7 0 0 35 56 21 3 15 39 22 219 -11 36 39 4 35 14 15 38 52 11 33 10 31 8 0 0 36 20 37 3 15 34 21 220 -11 37 3 29 35 38 23 39 17 5 33 34 15 9 0 0 36 45 9 3 15 30 20 220 -10 37 28 10 36 2 46 39 42 15 33 58 15 10 0 0 37 9 55 3 15 25 19 221 -9 37 53 5 36 27 24 40 7 40 34 22 30 11 0 0 37 34 56 3 15 21 18 222 -8 38 18 15 36 52 16 40 33 18 34 46 59 12 0 0 38 0 11 3 15 17 17 223 -7 38 43 38 37 17 22 40 59 10 35 11 42 13 0 0 38 25 38 3 15 13 17 223 -6 39 9 14 37 42 41 41 25 15 35 36 38 14 0 0 38 51 17 3 15 10 16 224 -5 39 35 1 38 8 12 41 51 31 36 1 46 15 0 0 39 17 8 3 15 6 15 225 -5 40 1 0 38 33 55 42 17 59 36 27 6 16 0 0 39 43 9 3 15 3 14 225 -4 40 27 10 38 59 48 42 44 36 36 52 37 17 0 0 40 9 19 3 15 0 13 226 -3 40 53 29 39 25 51 43 11 22 37 18 18 18 0 0 40 35 39 3 14 57 12 227 -2 41 19 56 39 52 2 43 38 17 37 44 8 19 0 0 41 2 7 3 14 54 11 227 -1 41 46 32 40 18 22 44 5 19 38 10 7 20 0 0 41 28 41 3 14 52 11 228 0 42 13 15 40 44 50 44 32 28 38 36 13 Uncertainty in time = +/- 14 secs Prediction of 2009 Jun 24.0 Data for the target star ------------------------ * name: 2UCAC 23257408 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 44 04.5306 DE: -21 53 52.766 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .125, .125 ) * V mag [mag]: 13.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (554) Peraga approx. diameter [km]: 96 approx. diameter ["]: .083 distance from Earth [AU]: 1.60200 * orbital information: orbit source: Preston date of fit: 2009 Jun 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 941 number of rejected observations: 157 time covered by the observations: 1900 Oct 01 - 2009 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 77° remarks: * orbital elements for (554) Peraga : Mean anomaly = 239.27796233 deg Arg. of pericenter = 127.14550884 deg Long. of node = 295.54626175 deg Inclination = 2.93881605 deg Eccentricity = 0.15374379 Semimajor axis = 2.37505459 AU Perihelion dist = 2.00990469 AU Mag: H = 9.00, G = 0.15 Epoch of elements : MJD 55013.14000000 TDT (2009 Jul 01.140) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 1 554 Peraga 3h 21.4m UT 13.4 19 44 4.531-21 53 52.772UCAC 23257408 0.0 12.5 96 8.9 1.602 -2.392 -3.32 -33.6544 -21.896 130.61 23.10 3.3569 -0.07181 0.71803 -6.06319 -0.60491 -0.00135 -0.00018 2000 238.4324432009 628.00000127.145509295.546262 2.9388160.15374379 2.3750546 2.0099047 9.0 5.00.15 RATE 2.6927350 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.126 0.126 90 2.51 0.125 0 55006.0020090701_257408 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 24, 16:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org