IOTA/IOTA-ES occultation update for (3144) Brosche / TYC 6268-01213-1 event on 2007 Jul 01, 13:34 UT Visible from Taiwan, China Summary ------- On 2007 Jul 01 UT, the 28 km diameter asteroid (3144) Brosche will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across Taiwan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 15.4 mag (the magnitude of the asteroid) for at most 3.6 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: 30 * date and approx. time of event: 2007 Jul 01, 13:22 - 2007 Jul 01, 13:45 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 3.6 * Moon: 99 % sunlit, 21° distance * Sun: 171° distance * rough path description: Taiwan, China The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 2.20 * 1 sigma uncertainty interval [seconds]: +/- 9.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .107 +/- .086) * 1 sigma uncertainty ellipse (major, minor, PA): ( .107", .085", 83° ) * approx speed of asteroid's shadow [km/s]: 7.6812 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6268-01213-1 by 3144 Brosche on 2007 Jul 01 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 75 0 0 .. .. .. .. .. .. .. .. .. .. .. .. 43 45 0 .. .. .. .. .. .. 76 0 0 43 34 5 13 45 50 1 116 8 43 44 19 43 23 53 44 29 35 .. .. .. 77 0 0 43 12 45 13 45 50 2 117 7 43 22 59 43 2 32 44 8 18 .. .. .. 78 0 0 42 51 9 13 45 49 2 118 6 43 1 24 42 40 55 43 46 47 .. .. .. 79 0 0 42 29 19 13 45 48 3 118 5 42 39 35 42 19 5 43 25 1 .. .. .. 80 0 0 42 7 16 13 45 48 4 119 5 42 17 32 41 57 1 43 3 1 .. .. .. 81 0 0 41 44 59 13 45 46 5 120 4 41 55 16 41 34 43 42 40 47 40 49 51 82 0 0 41 22 29 13 45 45 6 120 3 41 32 46 41 12 13 42 18 20 40 27 18 83 0 0 40 59 46 13 45 44 7 121 2 41 10 4 40 49 30 41 55 40 40 4 33 84 0 0 40 36 52 13 45 42 7 122 1 40 47 10 40 26 35 41 32 47 39 41 36 85 0 0 40 13 45 13 45 40 8 122 0 40 24 4 40 3 28 41 9 43 39 18 28 86 0 0 39 50 28 13 45 38 9 123 0 40 0 47 39 40 10 40 46 28 38 55 9 87 0 0 39 27 0 13 45 35 10 124 -1 39 37 19 39 16 42 40 23 1 38 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Data for the target star ------------------------ * name: TYC 6268-01213-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 51.5666 DE: -18 18 32.071 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .041 ) * V mag [mag]: 11.4 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3144) Brosche approx. diameter [km]: 28 approx. diameter ["]: .040 distance from Earth [AU]: 0.96500 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 576 number of rejected observations: 8 time covered by the observations: 1931 Oct 19 - 2007 Jun 27 1 sigma uncertainty ellipse (major, minor, PA): 0.105, 0.075, 83° remarks: * orbital elements for (3144) Brosche : Mean anomaly = 312.54615138 deg Arg. of pericenter = 95.41181806 deg Long. of node = 248.90344610 deg Inclination = 5.50711059 deg Eccentricity = 0.20953054 Semimajor axis = 2.22549534 AU Perihelion dist = 1.75918611 AU Mag: H = 13.73, G = 0.15 Epoch of elements : MJD 54282.56600000 TDT (2007 Jul 01.566) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 01 3144 Brosche 13h 34.3m UT 11.4 18 8 51.567-18 18 32.07TYC 6268-01213-1 11.9 15.4 28 3.6 0.965 -2.702 9.01 149.408 -18.310 -22.62 23.11 13.5719 .12553 .53689 -4.22134 0.98829 0.00062 -0.00043 2000 311.7843862007 629.00000 95.411818248.903446 5.5071110.209530542.225495341.7591861113.65 0.15 RATE 2.9686850 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.107 0.085 83.3 3.200 0.088 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 01:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org