IOTA/IOTA-ES occultation update for (2729) Urumqi / TYC 1845-02384-1 event on 2009 Nov 22, 13:23 UT Visible from W USA, E Russia, China Summary ------- On 2009 Nov 22 UT, the 19 km diameter asteroid (2729) Urumqi will occult a 9.9 mag star in the constellation Taurus for observers along a path across W USA, E Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.8 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.6 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: 18 * date and approx. time of event: 2009 Nov 22, 13:16 - 2009 Nov 22, 13:31 UT * magnitude of target star: 9.9 * magnitude drop [mag]: 5.8 * estimated maximum duration [s]: 1.6 * Moon: 29 % sunlit, 132° distance * Sun: 163° distance * rough path description: W USA, E Russia, China The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.73 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .048", 82° ) * approx speed of asteroid's shadow [km/s]: 11.8822 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1845-02384-1 by 2729 Urumqi on 2009 Nov 22 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 72 0 0 24 4 44 13 31 39 1 65 -15 24 11 5 23 58 24 24 58 37 .. .. .. 73 0 0 24 31 29 13 31 39 2 65 -16 24 37 50 24 25 9 25 25 24 .. .. .. 74 0 0 24 58 13 13 31 38 3 65 -17 25 4 34 24 51 52 25 52 9 .. .. .. 75 0 0 25 24 56 13 31 38 4 66 -18 25 31 17 25 18 35 26 18 53 .. .. .. 76 0 0 25 51 36 13 31 37 5 66 -19 25 57 57 25 45 15 26 45 35 .. .. .. 77 0 0 26 18 13 13 31 36 6 67 -20 26 24 35 26 11 52 27 12 13 25 24 40 78 0 0 26 44 47 13 31 35 7 67 -21 26 51 9 26 38 26 27 38 48 25 51 13 79 0 0 27 11 16 13 31 33 8 68 -22 27 17 38 27 4 55 28 5 18 26 17 42 80 0 0 27 37 41 13 31 32 9 68 -23 27 44 3 27 31 19 28 31 43 26 44 6 81 0 0 28 4 0 13 31 30 10 68 -24 28 10 21 27 57 38 28 58 2 27 10 24 82 0 0 28 30 12 13 31 28 11 69 -25 28 36 34 28 23 51 29 24 15 27 36 37 83 0 0 28 56 18 13 31 26 12 69 -26 29 2 40 28 49 56 29 50 20 28 2 43 84 0 0 29 22 16 13 31 24 13 70 -27 29 28 38 29 15 55 30 16 18 28 28 41 85 0 0 29 48 6 13 31 22 14 70 -28 29 54 28 29 41 45 30 42 7 28 54 32 86 0 0 30 13 47 13 31 20 15 71 -29 30 20 9 30 7 26 31 7 47 29 20 14 87 0 0 30 39 19 13 31 17 16 72 -30 30 45 41 30 32 58 31 33 18 29 45 47 88 0 0 31 4 41 13 31 14 16 72 -31 31 11 3 30 58 20 31 58 39 30 11 10 89 0 0 31 29 53 13 31 11 17 73 -31 31 36 14 31 23 32 32 23 49 30 36 24 90 0 0 31 54 54 13 31 8 18 73 -32 32 1 15 31 48 33 32 48 48 31 1 26 91 0 0 32 19 43 13 31 5 19 74 -33 32 26 4 32 13 23 33 13 36 31 26 17 92 0 0 32 44 21 13 31 2 20 74 -34 32 50 41 32 38 1 33 38 11 31 50 57 93 0 0 33 8 46 13 30 58 21 75 -35 33 15 6 33 2 26 34 2 34 32 15 24 94 0 0 33 32 58 13 30 55 22 76 -36 33 39 18 33 26 38 34 26 44 32 39 39 95 0 0 33 56 57 13 30 51 23 76 -37 34 3 16 33 50 38 34 50 40 33 3 40 96 0 0 34 20 42 13 30 48 24 77 -37 34 27 1 34 14 23 35 14 22 33 27 28 97 0 0 34 44 13 13 30 44 25 77 -38 34 50 32 34 37 54 35 37 50 33 51 2 98 0 0 35 7 29 13 30 40 25 78 -39 35 13 48 35 1 11 36 1 3 34 14 22 99 0 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33 -107 0 0 34 49 25 13 16 26 23 283 -7 34 55 44 34 43 6 35 43 2 33 56 15 -106 0 0 34 25 56 13 16 23 22 284 -6 34 32 15 34 19 37 35 19 35 33 32 43 -105 0 0 34 2 12 13 16 19 22 285 -5 34 8 32 33 55 53 34 55 55 33 8 56 -104 0 0 33 38 15 13 16 16 21 285 -4 33 44 35 33 31 55 34 32 0 32 44 56 -103 0 0 33 14 4 13 16 12 20 286 -3 33 20 24 33 7 44 34 7 52 32 20 43 -102 0 0 32 49 41 13 16 9 19 286 -2 32 56 1 32 43 20 33 43 31 31 56 17 -101 0 0 32 25 4 13 16 6 18 287 -2 32 31 25 32 18 44 33 18 57 31 31 39 -100 0 0 32 0 16 13 16 3 17 288 -1 32 6 37 31 53 55 32 54 11 31 6 48 Uncertainty in time = +/- 9 secs Prediction of 2009 Nov 15.0 Data for the target star ------------------------ * name: TYC 1845-02384-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 06 20.3851 DE: +23 29 58.808 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 9.9 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2729) Urumqi approx. diameter [km]: 19 approx. diameter ["]: .013 distance from Earth [AU]: 1.96700 * orbital information: orbit source: Preston date of fit: 2009 Oct 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1028 number of rejected observations: 18 time covered by the observations: 1979 Sep 22 - 2008 Dec 01 1 sigma uncertainty ellipse (major, minor, PA): 0.070, 0.045, 82° remarks: * orbital elements for (2729) Urumqi : Mean anomaly = 96.56975014 deg Arg. of pericenter = 263.27826685 deg Long. of node = 64.21396911 deg Inclination = 3.17072889 deg Eccentricity = 0.06982204 Semimajor axis = 2.88685535 AU Perihelion dist = 2.68528922 AU Mag: H = 11.49, G = 0.15 Epoch of elements : MJD 55157.55800000 TDT (2009 Nov 22.558) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 22 2729 Urumqi 13h 23.6m UT 9.9 5 6 20.385 23 29 58.81TYC 1845-02384-1 11.1 15.7 19 1.6 1.967 -2.181 -0.20 174.0116 23.500 -24.35 -20.23 13.3939 -0.00319 0.44190 -6.70652 -0.04320 -0.00175 -0.00023 2000 95.05104520091115.00000263.278267 64.213969 3.1707290.06982204 2.8868554 2.685289211.4 5.00.15 RATE 2.0094010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.048 82 4.73 0.050 0 055150.0020091122_2384-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Oct 16, 11:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org