IOTA/IOTA-ES occultation update for (654) Zelinda / TYC 1106-01551-1 event on 2007 Sep 01, 01:21 UT Visible from Africa, Brazil, Ecuador Summary ------- On 2007 Sep 01 UT, the 127 km diameter asteroid (654) Zelinda will occult a 11.3 mag star in the constellation Equuleus for observers along a path across Africa, Brazil, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.7 mag (the magnitude of the asteroid) for at most 9.4 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: 99 * date and approx. time of event: 2007 Sep 01, 01:14 - 2007 Sep 01, 01:29 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 9.4 * Moon: 83 % sunlit, 61° distance * Sun: 155° distance * rough path description: Africa, Brazil, Ecuador The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .022", 356° ) * approx speed of asteroid's shadow [km/s]: 13.5422 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1106-01551-1 by 654 Zelinda on 2007 Sep 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 -129 0 0 -13 12 14 1 29 44 0 82 14 -12 37 25 -13 47 4 -12 14 25 -14 10 3 -128 0 0 -13 3 20 1 29 44 1 81 13 -12 28 29 -13 38 11 -12 5 29 -14 1 11 -127 0 0 -12 54 10 1 29 44 2 81 12 -12 19 18 -13 29 2 -11 56 17 -13 52 3 -126 0 0 -12 44 45 1 29 43 3 81 11 -12 9 52 -13 19 39 -11 46 49 -13 42 40 -125 0 0 -12 35 5 1 29 43 4 81 10 -12 0 10 -13 10 0 -11 37 7 -13 33 2 -124 0 0 -12 25 10 1 29 42 5 80 9 -11 50 13 -13 0 6 -11 27 9 -13 23 10 -123 0 0 -12 15 0 1 29 41 6 80 8 -11 40 2 -12 49 58 -11 16 57 -13 13 2 -122 0 0 -12 4 35 1 29 40 7 80 8 -11 29 36 -12 39 35 -11 6 30 -13 2 40 -121 0 0 -11 53 56 1 29 39 8 80 7 -11 18 55 -12 28 57 -10 55 48 -12 52 3 -120 0 0 -11 43 3 1 29 38 9 80 6 -11 8 0 -12 18 5 -10 44 52 -12 41 12 -119 0 0 -11 31 55 1 29 37 10 79 5 -10 56 51 -12 6 59 -10 33 42 -12 30 7 -118 0 0 -11 20 34 1 29 35 11 79 4 -10 45 28 -11 55 39 -10 22 18 -12 18 48 -117 0 0 -11 8 58 1 29 34 12 79 3 -10 33 51 -11 44 5 -10 10 41 -12 7 15 -116 0 0 -10 57 9 1 29 32 13 79 2 -10 22 1 -11 32 18 - 9 58 49 -11 55 29 -115 0 0 -10 45 7 1 29 30 14 79 1 -10 9 57 -11 20 17 - 9 46 44 -11 43 29 -114 0 0 -10 32 52 1 29 28 15 78 0 - 9 57 40 -11 8 3 - 9 34 26 -11 31 16 -113 0 0 -10 20 23 1 29 25 16 78 -1 - 9 45 10 -10 55 36 - 9 21 55 -11 18 50 -112 0 0 -10 7 42 1 29 23 17 78 -2 - 9 32 28 -10 42 56 - 9 9 12 -11 6 11 -111 0 0 - 9 54 48 1 29 21 18 78 -3 - 9 19 32 -10 30 4 - 8 56 15 -10 53 20 -110 0 0 - 9 41 42 1 29 18 19 78 -4 - 9 6 25 -10 16 59 - 8 43 7 -10 40 16 -109 0 0 - 9 28 24 1 29 15 20 78 -5 - 8 53 5 -10 3 43 - 8 29 46 -10 27 1 -108 0 0 - 9 14 54 1 29 12 21 77 -5 - 8 39 34 - 9 50 14 - 8 16 14 -10 13 33 -107 0 0 - 9 1 12 1 29 9 22 77 -6 - 8 25 50 - 9 36 34 - 8 2 30 - 9 59 54 -106 0 0 - 8 47 19 1 29 6 23 77 -7 - 8 11 56 - 9 22 42 - 7 48 34 - 9 46 3 -105 0 0 - 8 33 15 1 29 3 24 77 -8 - 7 57 50 - 9 8 39 - 7 34 28 - 9 32 1 -104 0 0 - 8 19 0 1 28 59 25 77 -9 - 7 43 34 - 8 54 25 - 7 20 10 - 9 17 48 -103 0 0 - 8 4 34 1 28 56 26 77 -10 - 7 29 7 - 8 40 1 - 7 5 42 - 9 3 25 -102 0 0 - 7 49 58 1 28 52 27 77 -11 - 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Data for the target star ------------------------ * name: TYC 1106-01551-1 * constellation : Equuleus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 23 19.0577 DE: +08 07 56.723 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .030 ) * V mag [mag]: 11.3 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (654) Zelinda approx. diameter [km]: 127 approx. diameter ["]: .095 distance from Earth [AU]: 1.83500 * orbital information: orbit source: Preston date of fit: 2007 Aug 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 831 number of rejected observations: 68 time covered by the observations: 1908 Jan 04 - 2007 Aug 27 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.011, 53° remarks: * orbital elements for (654) Zelinda : Mean anomaly = 209.88954556 deg Arg. of pericenter = 214.00505699 deg Long. of node = 278.57187224 deg Inclination = 18.12869101 deg Eccentricity = 0.23229447 Semimajor axis = 2.29600440 AU Perihelion dist = 1.76265528 AU Mag: H = 8.51, G = 0.15 Epoch of elements : MJD 54344.05700000 TDT (2007 Sep 01.057) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 01 654 Zelinda 1h 21.9m UT 11.3 21 23 19.058 8 7 56.72TYC 1106-01551-1 12.6 12.7 127 9.4 1.835 -2.388 -9.17 320.520 8.135 159.59 8.47 1.3649 -.00543 .01976 -7.40050 -1.91241 0.00178 -0.00158 2000 208.7402022007 828.00000214.005057278.571872 18.1286910.232294472.296004401.762655288.525 0.15 RATE 2.8329890 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.032 0.022 355.9 1.330 0.032 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 28, 22:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org