IOTA/IOTA-ES occultation update for (334) Chicago / UCAC2 33507763 event on 2008 Oct 14, 01:26 UT Visible from SW Asia, Africa, Brazil, Peru Summary ------- On 2008 Oct 14 UT, the 159 km diameter asteroid (334) Chicago will occult a 11.2 mag star in the constellation Pisces for observers along a path across SW Asia, Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.2 mag (the magnitude of the asteroid) for at most 10.8 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: 94 * date and approx. time of event: 2008 Oct 14, 01:19 - 2008 Oct 14, 01:33 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 10.8 * Moon: 99 % sunlit, 20° distance * Sun: 171° distance * rough path description: SW Asia, Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 161 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .034", 357° ) * approx speed of asteroid's shadow [km/s]: 14.6881 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 33507763 by 334 Chicago on 2008 Oct 14 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 -106 0 0 -13 56 33 1 33 39 1 84 -8 -13 12 41 -14 40 19 -12 32 15 -15 20 32 -105 0 0 -13 50 33 1 33 39 2 84 -9 -13 6 40 -14 34 21 -12 26 12 -15 14 35 -104 0 0 -13 44 9 1 33 39 3 84 -10 -13 0 14 -14 27 59 -12 19 44 -15 8 15 -103 0 0 -13 37 21 1 33 38 4 84 -11 -12 53 24 -14 21 13 -12 12 53 -15 1 31 -102 0 0 -13 30 9 1 33 38 5 84 -12 -12 46 10 -14 14 4 -12 5 37 -14 54 23 -101 0 0 -13 22 34 1 33 37 6 83 -13 -12 38 32 -14 6 30 -11 57 56 -14 46 51 -100 0 0 -13 14 34 1 33 36 7 83 -14 -12 30 30 -13 58 33 -11 49 52 -14 38 56 - 99 0 0 -13 6 10 1 33 35 8 83 -15 -12 22 4 -13 50 12 -11 41 24 -14 30 37 - 98 0 0 -12 57 23 1 33 34 9 83 -16 -12 13 14 -13 41 27 -11 32 32 -14 21 55 - 97 0 0 -12 48 13 1 33 33 10 82 -17 -12 4 1 -13 32 19 -11 23 17 -14 12 49 - 96 0 0 -12 38 39 1 33 32 11 82 -18 -11 54 24 -13 22 48 -11 13 37 -14 3 20 - 95 0 0 -12 28 41 1 33 30 12 82 -19 -11 44 24 -13 12 53 -11 3 34 -13 53 28 - 94 0 0 -12 18 20 1 33 28 13 82 -20 -11 34 0 -13 2 35 -10 53 8 -13 43 13 - 93 0 0 -12 7 36 1 33 27 14 82 -21 -11 23 13 -12 51 54 -10 42 18 -13 32 35 - 92 0 0 -11 56 29 1 33 25 15 81 -22 -11 12 3 -12 40 50 -10 31 6 -13 21 33 - 91 0 0 -11 44 59 1 33 23 16 81 -23 -11 0 30 -12 29 23 -10 19 30 -13 10 10 - 90 0 0 -11 33 7 1 33 21 17 81 -24 -10 48 34 -12 17 34 -10 7 31 -12 58 23 - 89 0 0 -11 20 52 1 33 19 18 81 -25 -10 36 16 -12 5 22 - 9 55 9 -12 46 14 - 88 0 0 -11 8 14 1 33 16 19 81 -26 -10 23 35 -11 52 47 - 9 42 25 -12 33 43 - 87 0 0 -10 55 14 1 33 14 20 81 -27 -10 10 31 -11 39 51 - 9 29 18 -12 20 49 - 86 0 0 -10 41 51 1 33 11 21 80 -28 - 9 57 5 -11 26 32 - 9 15 49 -12 7 33 - 85 0 0 -10 28 7 1 33 8 22 80 -29 - 9 43 17 -11 12 51 - 9 1 58 -11 53 56 - 84 0 0 -10 14 0 1 33 5 23 80 -30 - 9 29 7 -10 58 48 - 8 47 44 -11 39 56 - 83 0 0 - 9 59 32 1 33 2 24 80 -31 - 9 14 36 -10 44 24 - 8 33 9 -11 25 35 - 82 0 0 - 9 44 43 1 32 59 25 80 -32 - 8 59 42 -10 29 38 - 8 18 13 -11 10 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259 -21 32 24 40 30 56 58 33 5 8 30 16 44 48 0 0 31 46 20 1 20 5 26 260 -20 32 30 11 31 2 33 33 10 37 30 22 21 49 0 0 31 51 32 1 20 2 25 260 -19 32 35 22 31 7 47 33 15 46 30 27 37 50 0 0 31 56 24 1 20 0 24 261 -18 32 40 12 31 12 41 33 20 34 30 32 32 51 0 0 32 0 54 1 19 57 23 261 -17 32 44 41 31 17 13 33 25 2 30 37 5 52 0 0 32 5 4 1 19 55 22 262 -17 32 48 49 31 21 24 33 29 9 30 41 18 53 0 0 32 8 53 1 19 52 22 262 -16 32 52 36 31 25 14 33 32 55 30 45 10 54 0 0 32 12 21 1 19 50 21 263 -15 32 56 3 31 28 43 33 36 20 30 48 40 55 0 0 32 15 27 1 19 48 20 263 -14 32 59 8 31 31 51 33 39 25 30 51 49 56 0 0 32 18 13 1 19 46 19 264 -13 33 1 53 31 34 38 33 42 8 30 54 37 57 0 0 32 20 38 1 19 43 18 265 -12 33 4 17 31 37 4 33 44 31 30 57 3 58 0 0 32 22 42 1 19 42 17 265 -12 33 6 20 31 39 9 33 46 33 30 59 9 59 0 0 32 24 24 1 19 40 16 266 -11 33 8 2 31 40 52 33 48 15 31 0 53 60 0 0 32 25 46 1 19 38 16 266 -10 33 9 23 31 42 14 33 49 35 31 2 15 61 0 0 32 26 47 1 19 36 15 267 -9 33 10 23 31 43 15 33 50 35 31 3 17 62 0 0 32 27 26 1 19 35 14 267 -8 33 11 2 31 43 55 33 51 14 31 3 57 63 0 0 32 27 44 1 19 33 13 268 -7 33 11 20 31 44 13 33 51 32 31 4 15 64 0 0 32 27 41 1 19 32 12 268 -7 33 11 17 31 44 10 33 51 29 31 4 12 65 0 0 32 27 17 1 19 30 11 269 -6 33 10 53 31 43 46 33 51 5 31 3 48 66 0 0 32 26 32 1 19 29 11 269 -5 33 10 8 31 43 1 33 50 20 31 3 2 67 0 0 32 25 25 1 19 28 10 270 -4 33 9 2 31 41 54 33 49 14 31 1 55 68 0 0 32 23 58 1 19 27 9 270 -3 33 7 35 31 40 26 33 47 47 31 0 26 69 0 0 32 22 8 1 19 26 8 271 -2 33 5 46 31 38 36 33 45 59 30 58 36 70 0 0 32 19 58 1 19 25 7 272 -2 33 3 36 31 36 25 33 43 50 30 56 24 71 0 0 32 17 26 1 19 24 6 272 -1 33 1 5 31 33 52 33 41 20 30 53 51 Uncertainty in time = +/- 5 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: UCAC2 33507763 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 52 11.6528 DE: +05 04 39.300 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .032 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (334) Chicago approx. diameter [km]: 159 approx. diameter ["]: .075 distance from Earth [AU]: 2.91700 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 869 number of rejected observations: 160 time covered by the observations: 1900 Sep 01 - 2008 Sep 24 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.014, 70° remarks: * orbital elements for (334) Chicago : Mean anomaly = 100.90896879 deg Arg. of pericenter = 152.37226343 deg Long. of node = 130.22083654 deg Inclination = 4.64308202 deg Eccentricity = 0.02368834 Semimajor axis = 3.88559957 AU Perihelion dist = 3.79355616 AU Mag: H = 7.50, G = 0.15 Epoch of elements : MJD 54753.06000000 TDT (2008 Oct 14.060) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 14 334 Chicago 1h 26.5m UT 11.2 1 52 11.653 5 4 39.30UCAC2 33507763 0.0 13.2 159 10.8 2.917 -1.541 -9.71 -16.5487 5.080 154.88 -8.23 1.4417 -0.05978 0.14216 -7.63860 -3.22213 -0.00088 0.00033 2000 100.51520320081011.00000152.372263130.220837 4.6430820.02368834 3.8855996 3.7935562 7.6 5.00.15 RATE 1.2868170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.034 357 1.46 0.034 0 54740.5020081014_507763 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org