IOTA/IOTA-ES occultation update for (313) Chaldaea / 2UCAC 31789938 event on 2008 Jul 06, 07:40 UT Visible from S USA, Mexico Summary ------- On 2008 Jul 06 UT, the 96 km diameter asteroid (313) Chaldaea will occult a 13.4 mag star in the constellation Aquarius for observers along a path across S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 13.6 mag (the magnitude of the asteroid) for at most 32.7 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: 66 * date and approx. time of event: 2008 Jul 06, 07:25 - 2008 Jul 06, 08:09 UT * magnitude of target star: 13.4 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 32.7 * Moon: 14 % sunlit, 168° distance * Sun: 128° distance * rough path description: S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 118 * 1 sigma uncertainty interval [path widths]: +/- 0.91 * 1 sigma uncertainty interval [seconds]: +/- 24.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .049", 360° ) * approx speed of asteroid's shadow [km/s]: 2.9441 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 31789938 by 313 Chaldaea on 2008 Jul 6 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 -162 0 0 24 24 16 8 9 22 0 90 -29 24 56 24 23 52 20 25 55 28 .. .. .. -161 0 0 24 24 16 8 9 21 1 91 -29 24 56 24 23 52 21 25 55 26 .. .. .. -160 0 0 24 24 30 8 9 20 2 91 -30 24 56 37 23 52 36 25 55 38 .. .. .. -159 0 0 24 24 58 8 9 18 3 92 -30 24 57 4 23 53 4 25 56 4 .. .. .. -158 0 0 24 25 39 8 9 16 4 92 -31 24 57 45 23 53 46 25 56 44 .. .. .. -157 0 0 24 26 34 8 9 13 5 92 -32 24 58 39 23 54 41 25 57 37 .. .. .. -156 0 0 24 27 42 8 9 9 6 93 -32 24 59 46 23 55 49 25 58 43 22 58 21 -155 0 0 24 29 3 8 9 4 7 93 -33 25 1 7 23 57 11 26 0 3 22 59 43 -154 0 0 24 30 37 8 8 59 8 94 -33 25 2 41 23 58 45 26 1 36 23 1 18 -153 0 0 24 32 24 8 8 53 8 94 -34 25 4 27 24 0 33 26 3 22 23 3 6 -152 0 0 24 34 23 8 8 47 9 94 -34 25 6 27 24 2 33 26 5 21 23 5 6 -151 0 0 24 36 36 8 8 40 10 95 -35 25 8 39 24 4 45 26 7 32 23 7 20 -150 0 0 24 39 0 8 8 33 11 95 -35 25 11 3 24 7 10 26 9 56 23 9 45 -149 0 0 24 41 37 8 8 24 12 96 -35 25 13 40 24 9 48 26 12 33 23 12 23 -148 0 0 24 44 27 8 8 16 13 96 -36 25 16 29 24 12 37 26 15 21 23 15 12 -147 0 0 24 47 28 8 8 7 14 97 -36 25 19 30 24 15 39 26 18 22 23 18 14 -146 0 0 24 50 41 8 7 57 14 97 -37 25 22 43 24 18 52 26 21 35 23 21 28 -145 0 0 24 54 6 8 7 46 15 97 -37 25 26 8 24 22 17 26 25 0 23 24 53 -144 0 0 24 57 43 8 7 35 16 98 -37 25 29 45 24 25 54 26 28 37 23 28 29 -143 0 0 25 1 31 8 7 24 17 98 -38 25 33 33 24 29 42 26 32 25 23 32 17 -142 0 0 25 5 30 8 7 12 18 99 -38 25 37 32 24 33 41 26 36 24 23 36 17 -141 0 0 25 9 41 8 6 59 19 99 -38 25 41 43 24 37 51 26 40 35 23 40 27 -140 0 0 25 14 2 8 6 46 20 100 -39 25 46 5 24 42 13 26 44 57 23 44 48 -139 0 0 25 18 35 8 6 33 20 100 -39 25 50 37 24 46 45 26 49 30 23 49 20 -138 0 0 25 23 18 8 6 18 21 101 -39 25 55 20 24 51 28 26 54 13 23 54 3 -137 0 0 25 28 11 8 6 4 22 101 -39 26 0 14 24 56 21 26 59 7 23 58 56 -136 0 0 25 33 16 8 5 49 23 102 -40 26 5 19 25 1 25 27 4 12 24 3 59 -135 0 0 25 38 30 8 5 33 24 102 -40 26 10 33 25 6 39 27 9 27 24 9 13 -134 0 0 25 43 54 8 5 17 24 103 -40 26 15 58 25 12 3 27 14 52 24 14 36 -133 0 0 25 49 28 8 5 1 25 103 -40 26 21 32 25 17 37 27 20 28 24 20 10 -132 0 0 25 55 12 8 4 44 26 104 -40 26 27 17 25 23 21 27 26 13 24 25 53 -131 0 0 26 1 6 8 4 27 27 104 -40 26 33 11 25 29 14 27 32 8 24 31 45 -130 0 0 26 7 9 8 4 9 28 105 -40 26 39 14 25 35 17 27 38 12 24 37 47 -129 0 0 26 13 22 8 3 51 28 106 -40 26 45 27 25 41 29 27 44 26 24 43 59 -128 0 0 26 19 43 8 3 32 29 106 -40 26 51 49 25 47 50 27 50 49 24 50 19 -127 0 0 26 26 14 8 3 13 30 107 -41 26 58 20 25 54 20 27 57 21 24 56 48 -126 0 0 26 32 53 8 2 53 31 107 -41 27 5 0 26 0 59 28 4 1 25 3 26 -125 0 0 26 39 41 8 2 34 31 108 -41 27 11 49 26 7 47 28 10 51 25 10 13 -124 0 0 26 46 38 8 2 13 32 109 -41 27 18 46 26 14 43 28 17 49 25 17 8 -123 0 0 26 53 43 8 1 53 33 109 -40 27 25 52 26 21 47 28 24 56 25 24 11 -122 0 0 27 0 56 8 1 32 34 110 -40 27 33 5 26 29 0 28 32 11 25 31 23 -121 0 0 27 8 17 8 1 11 34 111 -40 27 40 27 26 36 20 28 39 34 25 38 42 -120 0 0 27 15 46 8 0 49 35 111 -40 27 47 57 26 43 49 28 47 5 25 46 9 -119 0 0 27 23 23 8 0 27 36 112 -40 27 55 35 26 51 25 28 54 44 25 53 44 -118 0 0 27 31 8 8 0 5 36 113 -40 28 3 20 26 59 8 29 2 30 26 1 27 -117 0 0 27 38 59 7 59 42 37 113 -40 28 11 12 27 7 0 29 10 24 26 9 17 -116 0 0 27 46 58 7 59 19 38 114 -40 28 19 12 27 14 58 29 18 25 26 17 14 -115 0 0 27 55 5 7 58 56 38 115 -39 28 27 19 27 23 3 29 26 34 26 25 18 -114 0 0 28 3 18 7 58 32 39 116 -39 28 35 33 27 31 16 29 34 49 26 33 29 -113 0 0 28 11 38 7 58 8 40 117 -39 28 43 53 27 39 35 29 43 11 26 41 47 -112 0 0 28 20 4 7 57 44 40 117 -39 28 52 21 27 48 0 29 51 40 26 50 11 -111 0 0 28 28 37 7 57 20 41 118 -39 29 0 54 27 56 32 30 0 15 26 58 42 -110 0 0 28 37 16 7 56 55 42 119 -38 29 9 34 28 5 11 30 8 57 27 7 19 -109 0 0 28 46 2 7 56 31 42 120 -38 29 18 21 28 13 55 30 17 44 27 16 2 -108 0 0 28 54 53 7 56 5 43 121 -38 29 27 13 28 22 46 30 26 38 27 24 51 -107 0 0 29 3 50 7 55 40 43 122 -37 29 36 11 28 31 42 30 35 38 27 33 46 -106 0 0 29 12 53 7 55 15 44 123 -37 29 45 14 28 40 44 30 44 43 27 42 46 -105 0 0 29 22 1 7 54 49 45 124 -37 29 54 24 28 49 52 30 53 54 27 51 52 -104 0 0 29 31 15 7 54 23 45 125 -36 30 3 38 28 59 5 31 3 10 28 1 3 -103 0 0 29 40 34 7 53 57 46 126 -36 30 12 58 29 8 23 31 12 32 28 10 20 -102 0 0 29 49 58 7 53 30 46 127 -36 30 22 23 29 17 46 31 21 58 28 19 41 -101 0 0 29 59 26 7 53 4 47 128 -35 30 31 52 29 27 13 31 31 29 28 29 8 -100 0 0 30 9 0 7 52 37 47 129 -35 30 41 27 29 36 46 31 41 5 28 38 39 - 99 0 0 30 18 38 7 52 10 48 130 -34 30 51 6 29 46 23 31 50 46 28 48 14 - 98 0 0 30 28 20 7 51 43 48 131 -34 31 0 49 29 56 5 32 0 31 28 57 54 - 97 0 0 30 38 7 7 51 16 49 132 -34 31 10 37 30 5 50 32 10 21 29 7 39 - 96 0 0 30 47 58 7 50 49 49 134 -33 31 20 28 30 15 40 32 20 14 29 17 27 - 95 0 0 30 57 52 7 50 21 50 135 -33 31 30 24 30 25 34 32 30 11 29 27 19 - 94 0 0 31 7 51 7 49 54 50 136 -32 31 40 23 30 35 32 32 40 12 29 37 15 - 93 0 0 31 17 53 7 49 26 50 137 -32 31 50 26 30 45 33 32 50 17 29 47 15 - 92 0 0 31 27 58 7 48 58 51 139 -31 32 0 33 30 55 37 33 0 25 29 57 18 - 91 0 0 31 38 7 7 48 30 51 140 -31 32 10 42 31 5 45 33 10 37 30 7 24 - 90 0 0 31 48 19 7 48 2 51 141 -30 32 20 55 31 15 56 33 20 51 30 17 33 - 89 0 0 31 58 34 7 47 34 52 143 -30 32 31 11 31 26 10 33 31 9 30 27 46 - 88 0 0 32 8 52 7 47 6 52 144 -29 32 41 30 31 36 27 33 41 29 30 38 1 - 87 0 0 32 19 12 7 46 38 52 145 -29 32 51 51 31 46 47 33 51 52 30 48 19 - 86 0 0 32 29 35 7 46 10 53 147 -28 33 2 15 31 57 9 34 2 18 30 58 40 - 85 0 0 32 40 0 7 45 42 53 148 -28 33 12 41 32 7 33 34 12 45 31 9 3 - 84 0 0 32 50 28 7 45 13 53 150 -27 33 23 9 32 18 0 34 23 15 31 19 28 - 83 0 0 33 0 57 7 44 45 53 151 -27 33 33 40 32 28 29 34 33 47 31 29 55 - 82 0 0 33 11 29 7 44 17 54 153 -26 33 44 12 32 38 59 34 44 21 31 40 24 - 81 0 0 33 22 2 7 43 48 54 154 -26 33 54 46 32 49 31 34 54 57 31 50 55 - 80 0 0 33 32 37 7 43 20 54 156 -25 34 5 21 33 0 5 35 5 34 32 1 27 - 79 0 0 33 43 13 7 42 51 54 157 -24 34 15 58 33 10 41 35 16 12 32 12 1 - 78 0 0 33 53 50 7 42 23 54 159 -24 34 26 37 33 21 17 35 26 52 32 22 37 - 77 0 0 34 4 29 7 41 55 54 160 -23 34 37 16 33 31 55 35 37 33 32 33 13 - 76 0 0 34 15 8 7 41 26 54 162 -23 34 47 56 33 42 34 35 48 14 32 43 50 - 75 0 0 34 25 48 7 40 58 54 163 -22 34 58 37 33 53 13 35 58 57 32 54 29 - 74 0 0 34 36 29 7 40 30 54 165 -21 35 9 19 34 3 53 36 9 40 33 5 8 - 73 0 0 34 47 11 7 40 1 54 166 -21 35 20 1 34 14 34 36 20 23 33 15 47 - 72 0 0 34 57 52 7 39 33 54 168 -20 35 30 43 34 25 15 36 31 7 33 26 27 - 71 0 0 35 8 34 7 39 5 54 169 -20 35 41 26 34 35 56 36 41 51 33 37 7 - 70 0 0 35 19 16 7 38 37 54 171 -19 35 52 9 34 46 38 36 52 35 33 47 47 - 69 0 0 35 29 58 7 38 9 54 172 -18 36 2 51 34 57 19 37 3 19 33 58 27 - 68 0 0 35 40 40 7 37 41 54 174 -18 36 13 33 35 8 0 37 14 2 34 9 7 - 67 0 0 35 51 21 7 37 13 54 176 -17 36 24 15 35 18 41 37 24 45 34 19 47 - 66 0 0 36 2 2 7 36 45 54 177 -17 36 34 56 35 29 21 37 35 27 34 30 26 - 65 0 0 36 12 41 7 36 18 54 179 -16 36 45 37 35 40 0 37 46 9 34 41 4 - 64 0 0 36 23 21 7 35 50 54 180 -15 36 56 16 35 50 39 37 56 49 34 51 42 - 63 0 0 36 33 59 7 35 23 53 182 -15 37 6 55 36 1 16 38 7 29 35 2 19 - 62 0 0 36 44 35 7 34 55 53 183 -14 37 17 32 36 11 53 38 18 7 35 12 54 - 61 0 0 36 55 11 7 34 28 53 184 -13 37 28 8 36 22 28 38 28 44 35 23 28 - 60 0 0 37 5 45 7 34 1 53 186 -13 37 38 43 36 33 1 38 39 20 35 34 1 - 59 0 0 37 16 18 7 33 34 52 187 -12 37 49 16 36 43 34 38 49 53 35 44 33 - 58 0 0 37 26 48 7 33 7 52 189 -11 37 59 47 36 54 4 39 0 25 35 55 3 - 57 0 0 37 37 17 7 32 41 52 190 -11 38 10 16 37 4 33 39 10 55 36 5 31 - 56 0 0 37 47 44 7 32 14 52 192 -10 38 20 43 37 14 59 39 21 23 36 15 57 - 55 0 0 37 58 9 7 31 48 51 193 -9 38 31 8 37 25 23 39 31 48 36 26 21 - 54 0 0 38 8 31 7 31 22 51 194 -9 38 41 31 37 35 46 39 42 12 36 36 42 - 53 0 0 38 18 51 7 30 56 51 196 -8 38 51 51 37 46 5 39 52 32 36 47 1 - 52 0 0 38 29 9 7 30 30 50 197 -7 39 2 9 37 56 22 40 2 50 36 57 18 - 51 0 0 38 39 23 7 30 4 50 198 -7 39 12 24 38 6 37 40 13 5 37 7 32 - 50 0 0 38 49 35 7 29 39 49 199 -6 39 22 35 38 16 48 40 23 17 37 17 44 - 49 0 0 38 59 44 7 29 13 49 201 -5 39 32 44 38 26 57 40 33 26 37 27 52 - 48 0 0 39 9 49 7 28 48 49 202 -5 39 42 50 38 37 3 40 43 32 37 37 57 - 47 0 0 39 19 52 7 28 23 48 203 -4 39 52 52 38 47 5 40 53 35 37 48 0 - 46 0 0 39 29 50 7 27 59 48 204 -3 40 2 51 38 57 4 41 3 33 37 57 58 - 45 0 0 39 39 46 7 27 34 47 206 -3 40 12 46 39 6 59 41 13 29 38 7 54 - 44 0 0 39 49 37 7 27 10 47 207 -2 40 22 38 39 16 51 41 23 20 38 17 45 - 43 0 0 39 59 25 7 26 46 46 208 -1 40 32 26 39 26 38 41 33 8 38 27 33 - 42 0 0 40 9 9 7 26 22 46 209 -1 40 42 9 39 36 22 41 42 51 38 37 17 - 41 0 0 40 18 49 7 25 58 45 210 0 40 51 49 39 46 2 41 52 31 38 46 58 Uncertainty in time = +/- 30 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: 2UCAC 31789938 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 17 51.5979 DE: -00 13 45.181 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .046, .058 ) * V mag [mag]: 13.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (313) Chaldaea approx. diameter [km]: 96 approx. diameter ["]: .064 distance from Earth [AU]: 2.06300 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 912 number of rejected observations: 117 time covered by the observations: 1902 Sep 02 - 2008 Jun 07 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 81° remarks: * orbital elements for (313) Chaldaea : Mean anomaly = 188.66008240 deg Arg. of pericenter = 316.15660127 deg Long. of node = 176.70465824 deg Inclination = 11.64882077 deg Eccentricity = 0.18044102 Semimajor axis = 2.37583011 AU Perihelion dist = 1.94713291 AU Mag: H = 9.04, G = 0.15 Epoch of elements : MJD 54653.32000000 TDT (2008 Jul 06.320) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 6 313 Chaldaea 7h 40.0m UT 13.4 22 17 51.598- 0 13 45.182UCAC 31789938 0.0 13.6 96 32.7 2.063 -0.465 -1.39 -65.1977 -0.228 66.20 22.64 7.6666 -0.11246 0.57009 -1.62971 -0.32464 -0.00385 -0.00213 2000 187.7665322008 7 3.00000316.156601176.704658 11.6488210.18044102 2.3758301 1.9471329 8.9 5.00.15 RATE 2.6914170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.049 360 1.91 0.059 0 54650.5020080706_789938 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org