IOTA/IOTA-ES occultation update for (823) Sisigambis / 2UCAC 39793861 event on 2007 Nov 03, 05:41 UT Visible from W Africa, N Brazil, Colombia, Ecuador Summary ------- On 2007 Nov 03 UT, the 17 km diameter asteroid (823) Sisigambis will occult a 11.5 mag star in the constellation Taurus for observers along a path across W Africa, N Brazil, Colombia, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 13.8 mag (the magnitude of the asteroid) for at most 2.2 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: 45 * date and approx. time of event: 2007 Nov 03, 05:28 - 2007 Nov 03, 05:55 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 2.2 * Moon: 37 % sunlit, 86° distance * Sun: 160° distance * rough path description: W Africa, N Brazil, Colombia, Ecuador The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .028", 83° ) * approx speed of asteroid's shadow [km/s]: 7.5920 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 39793861 by 823 Sisigambis on 2007 Nov 03 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 -145 0 0 -36 21 53 5 55 4 0 61 -19 -36 16 12 -36 27 34 .. .. .. -36 44 5 -144 0 0 -35 54 48 5 55 4 1 60 -20 -35 49 6 -36 0 30 -35 32 36 -36 17 3 -143 0 0 -35 27 20 5 55 4 2 60 -21 -35 21 37 -35 33 3 -35 5 6 -35 49 38 -142 0 0 -34 59 29 5 55 3 3 59 -22 -34 53 46 -35 5 13 -34 37 13 -35 21 50 -141 0 0 -34 31 17 5 55 2 4 59 -23 -34 25 33 -34 37 1 -34 8 58 -34 53 40 -140 0 0 -34 2 43 5 55 1 5 58 -24 -33 56 59 -34 8 28 -33 40 21 -34 25 9 -139 0 0 -33 33 48 5 54 59 6 57 -25 -33 28 3 -33 39 33 -33 11 24 -33 56 16 -138 0 0 -33 4 33 5 54 58 7 57 -26 -32 58 47 -33 10 19 -32 42 6 -33 27 3 -137 0 0 -32 34 58 5 54 56 8 56 -27 -32 29 11 -32 40 44 -32 12 29 -32 57 30 -136 0 0 -32 5 3 5 54 53 9 56 -27 -31 59 17 -32 10 50 -31 42 33 -32 27 38 -135 0 0 -31 34 51 5 54 51 10 55 -28 -31 29 4 -31 40 38 -31 12 19 -31 57 27 -134 0 0 -31 4 20 5 54 48 11 55 -29 -30 58 33 -31 10 8 -30 41 47 -31 26 58 -133 0 0 -30 33 32 5 54 45 12 54 -30 -30 27 45 -30 39 21 -30 10 58 -30 56 12 -132 0 0 -30 2 29 5 54 42 13 54 -31 -29 56 41 -30 8 17 -29 39 53 -30 25 9 -131 0 0 -29 31 9 5 54 38 14 53 -32 -29 25 21 -29 36 58 -29 8 32 -29 53 51 -130 0 0 -28 59 35 5 54 34 15 53 -33 -28 53 47 -29 5 24 -28 36 57 -29 22 18 -129 0 0 -28 27 47 5 54 30 16 52 -34 -28 21 59 -28 33 36 -28 5 8 -28 50 31 -128 0 0 -27 55 46 5 54 26 17 52 -35 -27 49 57 -28 1 36 -27 33 7 -28 18 30 -127 0 0 -27 23 33 5 54 21 18 51 -36 -27 17 44 -27 29 23 -27 0 53 -27 46 18 -126 0 0 -26 51 9 5 54 16 19 51 -37 -26 45 20 -26 56 58 -26 28 29 -27 13 54 -125 0 0 -26 18 34 5 54 10 20 50 -38 -26 12 45 -26 24 24 -25 55 54 -26 41 19 -124 0 0 -25 45 50 5 54 5 21 50 -39 -25 40 1 -25 51 39 -25 23 9 -26 8 35 -123 0 0 -25 12 57 5 53 59 22 49 -40 -25 7 8 -25 18 47 -24 50 17 -25 35 42 -122 0 0 -24 39 57 5 53 53 23 49 -41 -24 34 8 -24 45 46 -24 17 17 -25 2 41 -121 0 0 -24 6 50 5 53 46 24 48 -42 -24 1 1 -24 12 39 -23 44 10 -24 29 34 -120 0 0 -23 33 37 5 53 39 25 48 -43 -23 27 49 -23 39 27 -23 10 59 -23 56 21 -119 0 0 -23 0 20 5 53 32 26 47 -44 -22 54 32 -23 6 9 -22 37 42 -23 23 2 -118 0 0 -22 26 59 5 53 25 27 47 -45 -22 21 11 -22 32 48 -22 4 22 -22 49 41 -117 0 0 -21 53 35 5 53 17 28 46 -46 -21 47 47 -21 59 24 -21 30 59 -22 16 16 -116 0 0 -21 20 10 5 53 9 29 46 -47 -21 14 22 -21 25 58 -20 57 35 -21 42 49 -115 0 0 -20 46 44 5 53 1 30 46 -48 -20 40 56 -20 52 31 -20 24 10 -21 9 21 -114 0 0 -20 13 18 5 52 53 31 45 -49 -20 7 31 -20 19 5 -19 50 46 -20 35 54 -113 0 0 -19 39 53 5 52 44 32 45 -50 -19 34 6 -19 45 40 -19 17 22 -20 2 27 -112 0 0 -19 6 30 5 52 35 33 44 -51 -19 0 44 -19 12 16 -18 44 1 -19 29 3 -111 0 0 -18 33 10 5 52 25 34 44 -52 -18 27 25 -18 38 56 -18 10 44 -18 55 41 -110 0 0 -17 59 55 5 52 16 35 43 -53 -17 54 9 -18 5 40 -17 37 30 -18 22 23 -109 0 0 -17 26 44 5 52 6 36 43 -54 -17 20 59 -17 32 29 -17 4 21 -17 49 11 -108 0 0 -16 53 39 5 51 56 37 42 -55 -16 47 55 -16 59 23 -16 31 19 -17 16 4 -107 0 0 -16 20 41 5 51 46 38 42 -55 -16 14 58 -16 26 25 -15 58 23 -16 43 3 -106 0 0 -15 47 51 5 51 35 39 41 -56 -15 42 8 -15 53 34 -15 25 35 -16 10 10 -105 0 0 -15 15 9 5 51 24 40 40 -57 -15 9 27 -15 20 51 -14 52 56 -15 37 26 -104 0 0 -14 42 37 5 51 13 41 40 -58 -14 36 55 -14 48 18 -14 20 26 -15 4 51 -103 0 0 -14 10 15 5 51 2 42 39 -59 -14 4 34 -14 15 56 -13 48 7 -14 32 26 -102 0 0 -13 38 4 5 50 51 43 39 -60 -13 32 24 -13 43 44 -13 15 59 -14 0 13 -101 0 0 -13 6 5 5 50 39 44 38 -61 -13 0 25 -13 11 44 -12 44 3 -13 28 11 -100 0 0 -12 34 18 5 50 27 45 38 -61 -12 28 40 -12 39 57 -12 12 19 -12 56 22 - 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0 4 43 18 0 0 - 0 6 58 5 29 0 5 293 14 - 0 1 38 - 0 12 19 0 13 49 - 0 27 49 19 0 0 - 0 30 32 5 28 58 4 293 15 - 0 25 11 - 0 35 53 - 0 9 40 - 0 51 27 20 0 0 - 0 54 36 5 28 58 2 293 16 - 0 49 14 - 0 59 59 .. .. .. - 1 15 35 21 0 0 - 1 19 12 5 28 57 1 293 17 - 1 13 49 - 1 24 35 .. .. .. - 1 40 15 22 0 0 - 1 44 18 5 28 57 0 293 18 - 1 38 54 - 1 49 42 .. .. .. - 2 5 25 Data for the target star ------------------------ * name: 2UCAC 39793861 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 49 01.7499 DE: +22 51 00.970 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .017 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (823) Sisigambis approx. diameter [km]: 17 approx. diameter ["]: .020 distance from Earth [AU]: 1.15500 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 704 number of rejected observations: 71 time covered by the observations: 1916 Apr 01 - 2007 Sep 20 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.022, 81° remarks: * orbital elements for (823) Sisigambis : Mean anomaly = 306.29831952 deg Arg. of pericenter = 218.35630319 deg Long. of node = 255.20514516 deg Inclination = 3.64605635 deg Eccentricity = 0.09090555 Semimajor axis = 2.22131826 AU Perihelion dist = 2.01938810 AU Mag: H = 11.00, G = 0.15 Epoch of elements : MJD 54407.23700000 TDT (2007 Nov 03.237) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 03 823 Sisigambis 5h 42.0m UT 11.5 3 49 1.750 22 51 0.972UCAC 39793861 0.0 13.8 17 2.2 1.155 -2.233 -10.64 -70.356 22.853 90.40 -14.95 5.7002 .11719 -.33887 -4.05130 -1.39625 -0.00179 -0.00065 2000 304.14382020071027.00000218.356303255.205145 3.6460560.090905552.221318262.0193881011.25 0.15 RATE 2.9770620 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.054 0.028 82.9 2.450 0.029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org