IOTA/IOTA-ES occultation update for (554) Peraga / TYC 6311-00249-1 event on 2009 Jul 05, 15:38 UT Visible from Summary ------- On 2009 Jul 05 UT, the 96 km diameter asteroid (554) Peraga will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.4 mag (the magnitude of the asteroid) for at most 8.5 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: 99 * date and approx. time of event: 2009 Jul 05, 15:33 - 2009 Jul 05, 15:42 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 8.5 * Moon: 97 % sunlit, 28° distance * Sun: 171° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 200 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .027", 86° ) * approx speed of asteroid's shadow [km/s]: 11.3488 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6311-00249-1 by 554 Peraga on 2009 Jul 5 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 179 35 57 55 0 0 15 33 53 5 218 -1 177 9 41 -178 1 56 175 30 34 -176 30 7 177 38 11 54 0 0 15 33 56 7 217 -2 175 11 41 -179 59 45 173 32 13 -178 28 8 175 37 52 53 0 0 15 34 0 8 215 -4 173 10 38 178 0 18 171 30 28 179 31 59 Latitude Latitude Latitude Latitude 174 0 0 52 12 16 15 34 4 10 214 -5 53 24 16 51 3 40 54 13 56 50 20 1 173 0 0 51 43 30 15 34 7 10 213 -6 52 54 48 50 35 31 53 43 57 49 52 14 172 0 0 51 15 9 15 34 10 11 212 -7 52 25 46 50 7 46 53 14 23 49 24 50 171 0 0 50 47 13 15 34 13 12 211 -7 51 57 9 49 40 25 52 45 17 48 57 50 170 0 0 50 19 43 15 34 16 12 211 -8 51 29 0 49 13 28 52 16 38 48 31 14 169 0 0 49 52 39 15 34 20 13 210 -9 51 1 18 48 46 58 51 48 27 48 5 4 168 0 0 49 26 2 15 34 23 14 209 -10 50 34 4 48 20 54 51 20 46 47 39 19 167 0 0 48 59 54 15 34 27 15 208 -10 50 7 19 47 55 17 50 53 34 47 14 1 166 0 0 48 34 13 15 34 31 15 207 -11 49 41 4 47 30 8 50 26 53 46 49 11 165 0 0 48 9 3 15 34 36 16 206 -12 49 15 19 47 5 27 50 0 43 46 24 48 164 0 0 47 44 22 15 34 40 17 205 -12 48 50 5 46 41 16 49 35 5 46 0 54 163 0 0 47 20 11 15 34 45 17 205 -13 48 25 22 46 17 33 49 9 58 45 37 29 162 0 0 46 56 31 15 34 49 18 204 -14 48 1 11 45 54 21 48 45 24 45 14 33 161 0 0 46 33 22 15 34 54 18 203 -14 47 37 32 45 31 39 48 21 23 44 52 7 160 0 0 46 10 45 15 34 59 19 202 -15 47 14 26 45 9 28 47 57 55 44 30 12 159 0 0 45 48 40 15 35 5 20 201 -16 46 51 52 44 47 48 47 35 2 44 8 47 158 0 0 45 27 7 15 35 10 20 200 -16 46 29 52 44 26 39 47 12 42 43 47 53 157 0 0 45 6 7 15 35 16 21 199 -17 46 8 26 44 6 3 46 50 57 43 27 31 156 0 0 44 45 41 15 35 21 21 198 -18 45 47 34 43 45 59 46 29 46 43 7 41 155 0 0 44 25 47 15 35 27 22 198 -18 45 27 17 43 26 28 46 9 11 42 48 23 154 0 0 44 6 28 15 35 33 22 197 -19 45 7 34 43 7 30 45 49 10 42 29 38 153 0 0 43 47 42 15 35 39 23 196 -20 44 48 25 42 49 5 45 29 46 42 11 25 152 0 0 43 29 31 15 35 45 23 195 -20 44 29 52 42 31 13 45 10 57 41 53 45 151 0 0 43 11 55 15 35 52 24 194 -21 44 11 55 42 13 55 44 52 44 41 36 39 150 0 0 42 54 53 15 35 58 24 193 -21 43 54 33 41 57 11 44 35 8 41 20 6 149 0 0 42 38 26 15 36 5 25 192 -22 43 37 46 41 41 2 44 18 8 41 4 7 148 0 0 42 22 34 15 36 11 25 191 -22 43 21 36 41 25 27 44 1 44 40 48 42 147 0 0 42 7 17 15 36 18 25 190 -23 43 6 2 41 10 26 43 45 57 40 33 51 146 0 0 41 52 36 15 36 25 26 189 -23 42 51 4 40 56 0 43 30 47 40 19 35 145 0 0 41 38 30 15 36 31 26 188 -24 42 36 42 40 42 9 43 16 14 40 5 53 144 0 0 41 25 1 15 36 38 26 187 -24 42 22 57 40 28 53 43 2 18 39 52 45 143 0 0 41 12 7 15 36 45 27 186 -25 42 9 49 40 16 12 42 48 59 39 40 13 142 0 0 40 59 49 15 36 52 27 185 -25 41 57 18 40 4 7 42 36 18 39 28 15 141 0 0 40 48 7 15 37 0 27 184 -25 41 45 23 39 52 37 42 24 14 39 16 52 140 0 0 40 37 2 15 37 7 27 183 -26 41 34 5 39 41 43 42 12 47 39 6 5 139 0 0 40 26 33 15 37 14 28 182 -26 41 23 25 39 31 24 42 1 59 38 55 52 138 0 0 40 16 40 15 37 21 28 181 -26 41 13 21 39 21 41 41 51 47 38 46 15 137 0 0 40 7 24 15 37 28 28 180 -27 41 3 55 39 12 34 41 42 14 38 37 14 136 0 0 39 58 44 15 37 36 28 179 -27 40 55 6 39 4 3 41 33 18 38 28 48 135 0 0 39 50 41 15 37 43 28 178 -27 40 46 54 38 56 8 41 25 1 38 20 58 134 0 0 39 43 15 15 37 50 28 177 -27 40 39 20 38 48 49 41 17 21 38 13 43 133 0 0 39 36 25 15 37 58 28 176 -28 40 32 23 38 42 6 41 10 19 38 7 4 132 0 0 39 30 12 15 38 5 29 175 -28 40 26 4 38 35 59 41 3 55 38 1 1 131 0 0 39 24 37 15 38 13 29 174 -28 40 20 23 38 30 28 40 58 9 37 55 34 130 0 0 39 19 38 15 38 20 29 173 -28 40 15 19 38 25 34 40 53 2 37 50 43 129 0 0 39 15 16 15 38 27 28 172 -28 40 10 52 38 21 17 40 48 32 37 46 27 128 0 0 39 11 31 15 38 35 28 171 -28 40 7 4 38 17 35 40 44 41 37 42 48 127 0 0 39 8 24 15 38 42 28 170 -28 40 3 53 38 14 30 40 41 28 37 39 45 126 0 0 39 5 53 15 38 50 28 169 -28 40 1 20 38 12 2 40 38 53 37 37 18 125 0 0 39 4 0 15 38 57 28 168 -28 39 59 25 38 10 10 40 36 57 37 35 27 124 0 0 39 2 43 15 39 4 28 167 -28 39 58 7 38 8 55 40 35 39 37 34 12 123 0 0 39 2 4 15 39 11 28 166 -28 39 57 28 38 8 16 40 34 59 37 33 34 122 0 0 39 2 2 15 39 19 28 165 -28 39 57 26 38 8 14 40 34 58 37 33 32 121 0 0 39 2 38 15 39 26 27 164 -28 39 58 3 38 8 49 40 35 35 37 34 6 120 0 0 39 3 50 15 39 33 27 163 -28 39 59 17 38 10 0 40 36 50 37 35 16 119 0 0 39 5 40 15 39 40 27 162 -28 40 1 9 38 11 48 40 38 44 37 37 3 118 0 0 39 8 8 15 39 47 27 161 -28 40 3 39 38 14 12 40 41 16 37 39 26 117 0 0 39 11 12 15 39 54 26 160 -28 40 6 48 38 17 14 40 44 27 37 42 25 116 0 0 39 14 54 15 40 1 26 159 -27 40 10 34 38 20 52 40 48 16 37 46 0 115 0 0 39 19 13 15 40 8 26 158 -27 40 14 58 38 25 6 40 52 44 37 50 12 114 0 0 39 24 10 15 40 14 25 157 -27 40 20 0 38 29 57 40 57 50 37 55 0 113 0 0 39 29 44 15 40 21 25 156 -27 40 25 40 38 35 25 41 3 35 38 0 25 112 0 0 39 35 55 15 40 27 25 155 -26 40 31 58 38 41 30 41 9 58 38 6 25 111 0 0 39 42 43 15 40 34 24 154 -26 40 38 55 38 48 11 41 17 0 38 13 2 110 0 0 39 50 9 15 40 40 24 153 -26 40 46 29 38 55 29 41 24 40 38 20 15 109 0 0 39 58 12 15 40 46 23 153 -25 40 54 41 39 3 24 41 32 58 38 28 5 108 0 0 40 6 52 15 40 52 23 152 -25 41 3 31 39 11 55 41 41 55 38 36 30 107 0 0 40 16 9 15 40 58 22 151 -25 41 12 59 39 21 3 41 51 31 38 45 32 106 0 0 40 26 4 15 41 4 22 150 -24 41 23 5 39 30 47 42 1 45 38 55 10 105 0 0 40 36 35 15 41 10 21 149 -24 41 33 48 39 41 7 42 12 37 39 5 24 104 0 0 40 47 44 15 41 16 21 148 -23 41 45 10 39 52 4 42 24 8 39 16 13 103 0 0 40 59 29 15 41 21 20 147 -23 41 57 9 40 3 37 42 36 17 39 27 39 102 0 0 41 11 52 15 41 26 20 147 -23 42 9 46 40 15 47 42 49 4 39 39 40 101 0 0 41 24 51 15 41 32 19 146 -22 42 23 0 40 28 32 43 2 29 39 52 17 100 0 0 41 38 27 15 41 37 18 145 -21 42 36 52 40 41 54 43 16 33 40 5 30 99 0 0 41 52 40 15 41 42 18 144 -21 42 51 22 40 55 51 43 31 14 40 19 18 98 0 0 42 7 29 15 41 46 17 143 -20 43 6 28 41 10 25 43 46 34 40 33 42 97 0 0 42 22 55 15 41 51 16 143 -20 43 22 12 41 25 34 44 2 31 40 48 41 96 0 0 42 38 57 15 41 55 16 142 -19 43 38 33 41 41 18 44 19 6 41 4 14 95 0 0 42 55 34 15 41 59 15 141 -19 43 55 31 41 57 38 44 36 18 41 20 23 94 0 0 43 12 48 15 42 4 14 140 -18 44 13 6 42 14 33 44 54 8 41 37 7 93 0 0 43 30 38 15 42 7 14 140 -17 44 31 18 42 32 3 45 12 36 41 54 24 92 0 0 43 49 3 15 42 11 13 139 -17 44 50 6 42 50 7 45 31 40 42 12 17 91 0 0 44 8 3 15 42 15 12 138 -16 45 9 30 43 8 47 45 51 21 42 30 43 90 0 0 44 27 39 15 42 18 12 137 -15 45 29 30 43 28 0 46 11 39 42 49 43 89 0 0 44 47 49 15 42 21 11 137 -15 45 50 5 43 47 47 46 32 33 43 9 17 88 0 0 45 8 34 15 42 24 10 136 -14 46 11 16 44 8 9 46 54 3 43 29 24 87 0 0 45 29 53 15 42 27 9 135 -13 46 33 3 44 29 3 47 16 10 43 50 3 86 0 0 45 51 46 15 42 29 9 134 -13 46 55 24 44 50 31 47 38 51 44 11 16 85 0 0 46 14 12 15 42 32 8 134 -12 47 18 20 45 12 31 48 2 8 44 33 0 84 0 0 46 37 12 15 42 34 7 133 -11 47 41 49 45 35 4 48 26 0 44 55 17 83 0 0 47 0 44 15 42 35 6 132 -11 48 5 53 45 58 8 48 50 27 45 18 4 82 0 0 47 24 49 15 42 37 6 131 -10 48 30 29 46 21 44 49 15 27 45 41 23 81 0 0 47 49 25 15 42 39 5 131 -9 48 55 39 46 45 51 49 41 1 46 5 12 80 0 0 48 14 32 15 42 40 4 130 -8 49 21 21 47 10 28 50 7 8 46 29 31 79 0 0 48 40 10 15 42 41 3 129 -8 49 47 34 47 35 35 50 33 47 46 54 19 78 0 0 49 6 18 15 42 42 3 128 -7 50 14 18 48 1 11 51 0 59 47 19 36 77 0 0 49 32 56 15 42 42 2 128 -6 50 41 33 48 27 16 51 28 41 .. .. .. 76 0 0 50 0 2 15 42 43 1 127 -5 51 9 18 48 53 48 .. .. .. .. .. .. 75 0 0 50 27 37 15 42 43 0 126 -4 .. .. .. 49 20 48 .. .. .. .. .. .. Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6311-00249-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 39 36.8028 DE: -21 59 53.857 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (554) Peraga approx. diameter [km]: 96 approx. diameter ["]: .084 distance from Earth [AU]: 1.58400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 837 number of rejected observations: 156 time covered by the observations: 1900 Oct 01 - 2008 Jan 18 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.011, 78° remarks: * orbital elements for (554) Peraga : Mean anomaly = 240.49594993 deg Arg. of pericenter = 127.14205297 deg Long. of node = 295.54633343 deg Inclination = 2.93878534 deg Eccentricity = 0.15373292 Semimajor axis = 2.37508389 AU Perihelion dist = 2.00995531 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 55017.65200000 TDT (2009 Jul 05.652) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 5 554 Peraga 15h 38.2m UT 11.4 19 39 36.803-21 59 53.86TYC 6311-00249-1 11.8 12.4 96 8.5 1.584 -2.546 -3.31 136.5737 -21.996 -53.40 22.73 15.6375 -0.08141 0.87327 -6.37778 -0.59604 -0.00087 -0.00010 2000 238.4355072009 628.00000127.142053295.546333 2.9387850.15373292 2.3750839 2.0099553 9.0 5.00.15 RATE 2.6926860 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.027 86 1.33 0.027 0 54545.5020090705_0249-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org