IOTA/IOTA-ES occultation update for (334) Chicago / UCAC2 38393442 event on 2009 Oct 04, 19:31 UT Visible from Summary ------- On 2009 Oct 04 UT, the 159 km diameter asteroid (334) Chicago will occult a 11.0 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 14.2 mag (the magnitude of the asteroid) for at most 29.2 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: 50 * date and approx. time of event: 2009 Oct 04, 19:15 - 2009 Oct 04, 19:33 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 29.2 * Moon: 100 % sunlit, 68° distance * Sun: 107° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 192 * 1 sigma uncertainty interval [path widths]: +/- 1.28 * 1 sigma uncertainty interval [seconds]: +/- 27.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .080", .059", 360° ) * approx speed of asteroid's shadow [km/s]: 5.4240 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 38393442 by 334 Chicago on 2009 Oct 4 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 34 0 0 43 19 54 19 15 1 0 64 -41 .. .. .. 44 19 21 .. .. .. 46 55 28 35 0 0 43 41 27 19 15 2 1 65 -41 42 42 50 44 40 51 .. .. .. 47 16 46 36 0 0 44 2 47 19 15 2 2 65 -41 43 4 14 45 2 6 .. .. .. 47 37 49 37 0 0 44 23 52 19 15 3 3 66 -42 43 25 24 45 23 7 .. .. .. 47 58 37 38 0 0 44 44 43 19 15 4 3 67 -42 43 46 19 45 43 53 .. .. .. 48 19 9 39 0 0 45 5 19 19 15 5 4 67 -42 44 6 59 46 4 23 .. .. .. 48 39 25 40 0 0 45 25 39 19 15 7 5 68 -42 44 27 25 46 24 38 .. .. .. 48 59 24 41 0 0 45 45 43 19 15 9 6 69 -43 44 47 35 46 44 37 .. .. .. 49 19 7 42 0 0 46 5 31 19 15 11 7 70 -43 45 7 29 47 4 19 .. .. .. 49 38 32 43 0 0 46 25 3 19 15 13 7 70 -43 45 27 6 47 23 45 .. .. .. 49 57 41 44 0 0 46 44 18 19 15 16 8 71 -43 45 46 28 47 42 53 .. .. .. 50 16 32 45 0 0 47 3 17 19 15 19 9 72 -43 46 5 32 48 1 45 .. .. .. 50 35 5 46 0 0 47 21 58 19 15 22 10 73 -43 46 24 20 48 20 19 43 59 50 50 53 21 47 0 0 47 40 22 19 15 25 10 73 -43 46 42 51 48 38 36 44 18 37 51 11 18 48 0 0 47 58 28 19 15 29 11 74 -43 47 1 4 48 56 35 44 37 6 51 28 57 49 0 0 48 16 16 19 15 32 12 75 -43 47 18 59 49 14 16 44 55 18 51 46 18 50 0 0 48 33 47 19 15 36 13 76 -43 47 36 37 49 31 39 45 13 13 52 3 20 51 0 0 48 50 59 19 15 40 13 76 -43 47 53 57 49 48 44 45 30 51 52 20 4 52 0 0 49 7 53 19 15 44 14 77 -43 48 10 58 50 5 30 45 48 10 52 36 29 53 0 0 49 24 29 19 15 49 15 78 -43 48 27 41 50 21 58 46 5 12 52 52 35 54 0 0 49 40 46 19 15 54 15 79 -43 48 44 6 50 38 8 46 21 55 53 8 22 55 0 0 49 56 45 19 15 58 16 80 -43 49 0 13 50 53 58 46 38 20 53 23 51 56 0 0 50 12 25 19 16 3 17 80 -43 49 16 1 51 9 30 46 54 27 53 39 0 57 0 0 50 27 46 19 16 9 17 81 -43 49 31 30 51 24 43 47 10 15 53 53 51 58 0 0 50 42 49 19 16 14 18 82 -43 49 46 40 51 39 37 47 25 44 54 8 23 59 0 0 50 57 32 19 16 19 19 83 -43 50 1 32 51 54 13 47 40 55 54 22 35 60 0 0 51 11 57 19 16 25 20 84 -43 50 16 4 52 8 29 47 55 47 54 36 29 61 0 0 51 26 3 19 16 31 20 85 -43 50 30 18 52 22 26 48 10 20 54 50 3 62 0 0 51 39 49 19 16 37 21 86 -43 50 44 13 52 36 5 48 24 34 55 3 19 63 0 0 51 53 17 19 16 43 21 86 -43 50 57 48 52 49 24 48 38 29 55 16 16 64 0 0 52 6 26 19 16 49 22 87 -42 51 11 5 53 2 25 48 52 5 55 28 54 65 0 0 52 19 16 19 16 55 23 88 -42 51 24 3 53 15 6 49 5 22 55 41 13 66 0 0 52 31 46 19 17 2 23 89 -42 51 36 42 53 27 29 49 18 21 55 53 13 67 0 0 52 43 58 19 17 8 24 90 -42 51 49 2 53 39 33 49 30 59 56 4 55 68 0 0 52 55 51 19 17 15 25 91 -42 52 1 3 53 51 18 49 43 19 56 16 18 69 0 0 53 7 26 19 17 22 25 92 -42 52 12 45 54 2 44 49 55 20 56 27 22 70 0 0 53 18 41 19 17 29 26 93 -41 52 24 8 54 13 51 50 7 2 56 38 8 71 0 0 53 29 38 19 17 36 26 94 -41 52 35 12 54 24 40 50 18 24 56 48 35 72 0 0 53 40 15 19 17 43 27 95 -41 52 45 57 54 35 10 50 29 28 56 58 44 73 0 0 53 50 35 19 17 50 28 96 -41 52 56 24 54 45 22 50 40 12 57 8 35 74 0 0 54 0 35 19 17 58 28 96 -40 53 6 31 54 55 15 50 50 38 57 18 8 75 0 0 54 10 17 19 18 5 29 97 -40 53 16 21 55 4 49 51 0 45 57 27 22 76 0 0 54 19 40 19 18 13 29 98 -40 53 25 51 55 14 5 51 10 32 57 36 19 77 0 0 54 28 45 19 18 20 30 99 -40 53 35 3 55 23 3 51 20 1 57 44 58 78 0 0 54 37 32 19 18 28 31 100 -39 53 43 56 55 31 43 51 29 11 57 53 18 79 0 0 54 46 0 19 18 36 31 101 -39 53 52 31 55 40 4 51 38 2 58 1 21 80 0 0 54 54 10 19 18 44 32 102 -39 54 0 48 55 48 8 51 46 34 58 9 7 81 0 0 55 2 2 19 18 52 32 103 -38 54 8 46 55 55 53 51 54 47 58 16 35 82 0 0 55 9 36 19 19 0 33 104 -38 54 16 26 56 3 21 52 2 42 58 23 45 83 0 0 55 16 52 19 19 8 33 105 -38 54 23 47 56 10 30 52 10 18 58 30 38 84 0 0 55 23 49 19 19 17 34 106 -38 54 30 51 56 17 22 52 17 36 58 37 14 85 0 0 55 30 29 19 19 25 34 107 -37 54 37 36 56 23 56 52 24 35 58 43 33 86 0 0 55 36 51 19 19 33 35 109 -37 54 44 3 56 30 12 52 31 15 58 49 34 87 0 0 55 42 55 19 19 42 35 110 -37 54 50 13 56 36 11 52 37 37 58 55 19 88 0 0 55 48 42 19 19 51 36 111 -36 54 56 4 56 41 52 52 43 41 59 0 46 89 0 0 55 54 10 19 19 59 36 112 -36 55 1 38 56 47 16 52 49 26 59 5 57 90 0 0 55 59 21 19 20 8 37 113 -36 55 6 53 56 52 23 52 54 53 59 10 50 91 0 0 56 4 15 19 20 17 37 114 -35 55 11 51 56 57 12 53 0 2 59 15 27 92 0 0 56 8 51 19 20 26 38 115 -35 55 16 31 57 1 43 53 4 52 59 19 48 93 0 0 56 13 9 19 20 35 38 116 -34 55 20 54 57 5 58 53 9 24 59 23 51 94 0 0 56 17 10 19 20 44 39 117 -34 55 24 59 57 9 55 53 13 38 59 27 38 95 0 0 56 20 54 19 20 53 39 118 -34 55 28 46 57 13 35 53 17 34 59 31 9 96 0 0 56 24 21 19 21 2 40 119 -33 55 32 15 57 16 58 53 21 12 59 34 23 97 0 0 56 27 30 19 21 11 40 121 -33 55 35 28 57 20 4 53 24 31 59 37 21 98 0 0 56 30 21 19 21 21 41 122 -33 55 38 22 57 22 53 53 27 33 59 40 2 99 0 0 56 32 56 19 21 30 41 123 -32 55 40 59 57 25 25 53 30 16 59 42 27 100 0 0 56 35 13 19 21 40 42 124 -32 55 43 19 57 27 40 53 32 42 59 44 35 101 0 0 56 37 13 19 21 49 42 125 -31 55 45 21 57 29 38 53 34 49 59 46 28 102 0 0 56 38 56 19 21 59 43 126 -31 55 47 6 57 31 19 53 36 38 59 48 4 103 0 0 56 40 22 19 22 8 43 128 -31 55 48 33 57 32 43 53 38 10 59 49 23 104 0 0 56 41 31 19 22 18 43 129 -30 55 49 43 57 33 50 53 39 23 59 50 27 105 0 0 56 42 22 19 22 28 44 130 -30 55 50 36 57 34 41 53 40 18 59 51 14 106 0 0 56 42 56 19 22 38 44 131 -29 55 51 11 57 35 14 53 40 56 59 51 45 107 0 0 56 43 13 19 22 48 45 133 -29 55 51 29 57 35 30 53 41 15 59 52 0 108 0 0 56 43 13 19 22 58 45 134 -29 55 51 29 57 35 30 53 41 16 59 51 58 109 0 0 56 42 56 19 23 8 46 135 -28 55 51 12 57 35 12 53 40 59 59 51 41 110 0 0 56 42 21 19 23 19 46 136 -28 55 50 37 57 34 38 53 40 24 59 51 7 111 0 0 56 41 30 19 23 29 46 138 -27 55 49 45 57 33 47 53 39 31 59 50 16 112 0 0 56 40 20 19 23 39 47 139 -27 55 48 35 57 32 38 53 38 20 59 49 10 113 0 0 56 38 54 19 23 50 47 140 -26 55 47 8 57 31 13 53 36 50 59 47 47 114 0 0 56 37 10 19 24 0 48 142 -26 55 45 23 57 29 30 53 35 3 59 46 7 115 0 0 56 35 9 19 24 11 48 143 -25 55 43 20 57 27 30 53 32 57 59 44 11 116 0 0 56 32 50 19 24 22 48 144 -25 55 41 0 57 25 13 53 30 33 59 41 59 117 0 0 56 30 14 19 24 32 49 146 -24 55 38 22 57 22 39 53 27 50 59 39 30 118 0 0 56 27 21 19 24 43 49 147 -24 55 35 26 57 19 48 53 24 49 59 36 45 119 0 0 56 24 9 19 24 54 49 149 -24 55 32 12 57 16 39 53 21 29 59 33 42 120 0 0 56 20 40 19 25 5 50 150 -23 55 28 41 57 13 12 53 17 51 59 30 23 121 0 0 56 16 54 19 25 17 50 152 -23 55 24 51 57 9 29 53 13 55 59 26 47 122 0 0 56 12 49 19 25 28 50 153 -22 55 20 43 57 5 27 53 9 39 59 22 55 123 0 0 56 8 26 19 25 39 51 154 -22 55 16 17 57 1 8 53 5 5 59 18 45 124 0 0 56 3 46 19 25 51 51 156 -21 55 11 33 56 56 31 53 0 12 59 14 18 125 0 0 55 58 47 19 26 2 51 157 -21 55 6 31 56 51 37 52 55 0 59 9 34 126 0 0 55 53 30 19 26 14 52 159 -20 55 1 10 56 46 24 52 49 30 59 4 33 127 0 0 55 47 55 19 26 25 52 161 -20 54 55 31 56 40 54 52 43 40 58 59 14 128 0 0 55 42 2 19 26 37 52 162 -19 54 49 33 56 35 5 52 37 30 58 53 38 129 0 0 55 35 50 19 26 49 52 164 -19 54 43 16 56 28 58 52 31 2 58 47 44 130 0 0 55 29 20 19 27 1 53 165 -18 54 36 40 56 22 32 52 24 14 58 41 33 131 0 0 55 22 30 19 27 13 53 167 -17 54 29 46 56 15 49 52 17 7 58 35 4 132 0 0 55 15 22 19 27 25 53 168 -17 54 22 33 56 8 46 52 9 40 58 28 16 133 0 0 55 7 55 19 27 37 53 170 -16 54 15 0 56 1 25 52 1 54 58 21 11 134 0 0 55 0 10 19 27 50 54 172 -16 54 7 8 55 53 45 51 53 47 58 13 48 135 0 0 54 52 4 19 28 2 54 173 -15 53 58 57 55 45 46 51 45 21 58 6 6 136 0 0 54 43 40 19 28 15 54 175 -15 53 50 26 55 37 29 51 36 35 57 58 5 137 0 0 54 34 56 19 28 28 54 177 -14 53 41 36 55 28 51 51 27 29 57 49 46 138 0 0 54 25 53 19 28 40 54 178 -14 53 32 26 55 19 55 51 18 3 57 41 8 139 0 0 54 16 30 19 28 53 55 180 -13 53 22 56 55 10 39 51 8 16 57 32 12 140 0 0 54 6 48 19 29 6 55 182 -12 53 13 7 55 1 4 50 58 9 57 22 56 141 0 0 53 56 45 19 29 19 55 184 -12 53 2 57 54 51 9 50 47 41 57 13 21 142 0 0 53 46 23 19 29 33 55 185 -11 52 52 27 54 40 54 50 36 53 57 3 27 143 0 0 53 35 40 19 29 46 55 187 -11 52 41 37 54 30 19 50 25 44 56 53 13 144 0 0 53 24 37 19 29 59 55 189 -10 52 30 26 54 19 24 50 14 15 56 42 40 145 0 0 53 13 14 19 30 13 55 191 -9 52 18 55 54 8 9 50 2 24 56 31 47 146 0 0 53 1 30 19 30 26 55 193 -9 52 7 3 53 56 34 49 50 13 56 20 34 147 0 0 52 49 26 19 30 40 55 194 -8 51 54 51 53 44 38 49 37 41 56 9 1 148 0 0 52 37 1 19 30 54 55 196 -8 51 42 17 53 32 22 49 24 47 55 57 7 149 0 0 52 24 15 19 31 8 55 198 -7 51 29 23 53 19 45 49 11 32 55 44 54 150 0 0 52 11 9 19 31 22 55 200 -6 51 16 8 53 6 47 48 57 57 55 32 20 151 0 0 51 57 41 19 31 36 55 202 -6 51 2 32 52 53 28 48 43 59 55 19 25 152 0 0 51 43 53 19 31 50 55 204 -5 50 48 35 52 39 49 48 29 41 55 6 10 153 0 0 51 29 43 19 32 5 55 206 -4 50 34 16 52 25 48 48 15 1 54 52 34 154 0 0 51 15 12 19 32 19 55 207 -4 50 19 37 52 11 26 48 0 0 54 38 37 155 0 0 51 0 20 19 32 34 55 209 -3 50 4 36 51 56 43 47 44 37 54 24 19 156 0 0 50 45 7 19 32 48 55 211 -2 49 49 13 51 41 39 47 28 53 54 9 40 157 0 0 50 29 32 19 33 3 55 213 -2 49 33 30 51 26 14 47 12 47 53 54 40 158 0 0 50 13 36 19 33 18 55 215 -1 49 17 25 51 10 27 46 56 20 53 39 18 159 0 0 49 57 19 19 33 33 55 217 0 49 0 58 50 54 19 46 39 32 53 23 35 Uncertainty in time = +/- 38 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 38393442 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 38 15.1910 DE: +18 53 15.401 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .056, .079 ) * V mag [mag]: 11.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (334) Chicago approx. diameter [km]: 159 approx. diameter ["]: .062 distance from Earth [AU]: 3.55900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 859 number of rejected observations: 159 time covered by the observations: 1900 Sep 01 - 2007 Dec 04 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 84° remarks: * orbital elements for (334) Chicago : Mean anomaly = 145.90857921 deg Arg. of pericenter = 153.15234737 deg Long. of node = 130.21900094 deg Inclination = 4.64307819 deg Eccentricity = 0.02330496 Semimajor axis = 3.88745025 AU Perihelion dist = 3.79685337 AU Mag: H = 7.49, G = 0.15 Epoch of elements : MJD 55108.81300000 TDT (2009 Oct 04.813) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 4 334 Chicago 19h 31.2m UT 11.0 5 38 15.191 18 53 15.40UCAC2 38393442 0.0 14.2 159 29.2 3.559 0.521 -1.55 138.1424 18.888 -115.65 -4.63 19.5200 0.11680 0.55094 2.99643 -0.62771 -0.00565 -0.00008 2000 144.7753162009 926.00000153.152347130.219001 4.6430780.02330496 3.8874503 3.7968534 7.6 5.00.15 RATE 1.2858990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.080 0.059 360 2.28 0.079 0 54545.5020091004_393442 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org