IOTA/IOTA-ES occultation update for (2393) Suzuki / TYC 1246-01055-1 event on 2007 Aug 01, 19:07 UT Visible from Australia Summary ------- On 2007 Aug 01 UT, the 49 km diameter asteroid (2393) Suzuki will occult a 11.4 mag star in the constellation Taurus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 16.1 mag (the magnitude of the asteroid) for at most 2.0 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: 40 * date and approx. time of event: 2007 Aug 01, 19:03 - 2007 Aug 01, 19:10 UT * midpoint of event [JD]: 2454314.29669583 * magnitude of target star: 11.4 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 2.0 * Moon: 91 % sunlit, 72° distance * Sun: 73° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 1.66 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .038", 86° ) * approx speed of asteroid's shadow [km/s]: 24.6077 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1246-01055-1 by 2393 Suzuki on 2007 Aug 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 105 0 0 -38 1 3 19 3 39 0 63 -57 -38 18 51 -37 43 19 .. .. .. .. .. .. 106 0 0 -37 36 58 19 3 39 1 63 -57 -37 54 47 -37 19 14 -38 54 24 .. .. .. 107 0 0 -37 12 44 19 3 39 2 62 -56 -37 30 33 -36 55 0 -38 30 11 .. .. .. 108 0 0 -36 48 21 19 3 39 3 61 -56 -37 6 10 -36 30 36 -38 5 48 .. .. .. 109 0 0 -36 23 50 19 3 39 4 61 -55 -36 41 39 -36 6 5 -37 41 17 .. .. .. 110 0 0 -35 59 10 19 3 40 5 60 -55 -36 16 59 -35 41 26 -37 16 38 .. .. .. 111 0 0 -35 34 24 19 3 40 6 60 -54 -35 52 13 -35 16 39 -36 51 51 .. .. .. 112 0 0 -35 9 31 19 3 40 6 59 -53 -35 27 20 -34 51 46 -36 26 57 -33 53 20 113 0 0 -34 44 32 19 3 41 7 58 -53 -35 2 20 -34 26 48 -36 1 57 -33 28 22 114 0 0 -34 19 28 19 3 42 8 58 -52 -34 37 16 -34 1 44 -35 36 51 -33 3 19 115 0 0 -33 54 19 19 3 43 9 57 -51 -34 12 6 -33 36 35 -35 11 41 -32 38 12 116 0 0 -33 29 6 19 3 43 10 57 -51 -33 46 53 -33 11 23 -34 46 25 -32 13 1 117 0 0 -33 3 49 19 3 44 11 56 -50 -33 21 36 -32 46 7 -34 21 7 -31 47 47 118 0 0 -32 38 30 19 3 45 12 56 -49 -32 56 16 -32 20 49 -33 55 45 -31 22 31 119 0 0 -32 13 10 19 3 46 13 55 -49 -32 30 55 -31 55 28 -33 30 21 -30 57 13 120 0 0 -31 47 47 19 3 48 14 54 -48 -32 5 32 -31 30 7 -33 4 55 -30 31 54 121 0 0 -31 22 25 19 3 49 15 54 -47 -31 40 8 -31 4 45 -32 39 29 -30 6 35 122 0 0 -30 57 2 19 3 50 16 53 -46 -31 14 45 -30 39 24 -32 14 2 -29 41 16 123 0 0 -30 31 41 19 3 52 17 53 -45 -30 49 22 -30 14 3 -31 48 36 -29 15 59 124 0 0 -30 6 21 19 3 53 18 52 -44 -30 24 1 -29 48 44 -31 23 11 -28 50 44 125 0 0 -29 41 3 19 3 55 19 52 -44 -29 58 42 -29 23 28 -30 57 49 -28 25 31 126 0 0 -29 15 48 19 3 57 20 51 -43 -29 33 27 -28 58 14 -30 32 29 -28 0 21 127 0 0 -28 50 38 19 3 58 21 50 -42 -29 8 14 -28 33 5 -30 7 12 -27 35 16 128 0 0 -28 25 31 19 4 0 21 50 -41 -28 43 7 -28 8 0 -29 42 0 -27 10 15 129 0 0 -28 0 30 19 4 2 22 49 -40 -28 18 4 -27 43 0 -29 16 53 -26 45 20 130 0 0 -27 35 35 19 4 4 23 49 -39 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14 13 .. .. .. -109 0 0 -22 21 59 19 10 49 5 295 50 -22 39 6 -22 4 55 -23 36 23 .. .. .. -108 0 0 -22 44 15 19 10 50 4 294 49 -23 1 24 -22 27 10 -23 58 48 .. .. .. -107 0 0 -23 6 46 19 10 50 3 294 49 -23 23 57 -22 49 39 -24 21 27 .. .. .. -106 0 0 -23 29 31 19 10 50 2 294 49 -23 46 44 -23 12 22 -24 44 20 .. .. .. -105 0 0 -23 52 29 19 10 50 1 293 48 -24 9 44 -23 35 18 -25 7 26 .. .. .. -104 0 0 -24 15 40 19 10 50 0 293 48 .. .. .. -23 58 27 .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 1246-01055-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 33 37.8172 DE: +20 46 41.271 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .017 ) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * Apparent position with proper motion RA(deg): 53.5175845450 DE(deg): 20.8051272938 * Equation of equinoxes (radians) : 0.000033236103884 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2393) Suzuki approx. diameter [km]: 49 approx. diameter ["]: .023 distance from Earth [AU]: 2.98000 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 592 number of rejected observations: 35 time covered by the observations: 1952 Jan 31 - 2006 Dec 12 1 sigma uncertainty ellipse (major, minor, PA): 0.054, 0.034, 86° remarks: * orbital elements for (2393) Suzuki : Mean anomaly = 43.60572173 deg Arg. of pericenter = 109.52693204 deg Long. of node = 225.15773816 deg Inclination = 10.24054491 deg Eccentricity = 0.18981022 Semimajor axis = 3.22754205 AU Perihelion dist = 2.61492159 AU Mag: H = 10.58, G = 0.15 Epoch of elements : MJD 54313.79700000 TDT (2007 Aug 01.797) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 2393 Suzuki 19h 7.2m UT 11.4 3 33 37.817 20 46 41.27TYC 1246-01055-1 11.8 16.1 49 2.0 2.980 2.897 5.40 -183.413 20.776 -105.22 17.96 19.1207 .07327 -.54661 13.76819 1.83009 -0.00516 -0.00122 2000 42.96031032007 729.00000109.526932225.157738 10.2405450.189810223.227542052.6149215910.55 0.15 RATE 1.6997937 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.056 0.038 86.3 2.660 0.038 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 08, 18:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org