IOTA/IOTA-ES occultation update for (1724) Vladimir / UCAC2 29715802 event on 2009 Jul 01, 14:23 UT Visible from Australia Summary ------- On 2009 Jul 01 UT, the 35 km diameter asteroid (1724) Vladimir will occult a 11.6 mag star in the constellation Aquila 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 3.8 mag to 15.4 mag (the magnitude of the asteroid) for at most 2.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 41 * date and approx. time of event: 2009 Jul 01, 14:14 - 2009 Jul 01, 14:31 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 2.8 * Moon: 71 % sunlit, 73° distance * Sun: 163° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 1.59 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .041", 91° ) * approx speed of asteroid's shadow [km/s]: 12.2239 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 29715802 by 1724 Vladimir on 2009 Jul 1 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 54 0 0 -32 13 32 14 31 9 0 97 -13 -32 3 19 -32 23 45 .. .. .. -32 56 21 55 0 0 -32 19 57 14 31 9 1 97 -13 -32 9 45 -32 30 10 .. .. .. -33 2 45 56 0 0 -32 26 11 14 31 9 2 96 -14 -32 15 58 -32 36 24 -31 43 36 -33 8 58 57 0 0 -32 32 12 14 31 8 3 96 -15 -32 22 0 -32 42 25 -31 49 38 -33 14 58 58 0 0 -32 38 2 14 31 8 3 95 -16 -32 27 50 -32 48 15 -31 55 29 -33 20 47 59 0 0 -32 43 40 14 31 7 4 95 -17 -32 33 28 -32 53 52 -32 1 8 -33 26 24 60 0 0 -32 49 6 14 31 7 5 94 -18 -32 38 55 -32 59 18 -32 6 35 -33 31 49 61 0 0 -32 54 20 14 31 6 6 93 -18 -32 44 9 -33 4 32 -32 11 50 -33 37 2 62 0 0 -32 59 22 14 31 5 7 93 -19 -32 49 11 -33 9 34 -32 16 53 -33 42 3 63 0 0 -33 4 12 14 31 4 8 92 -20 -32 54 2 -33 14 24 -32 21 44 -33 46 52 64 0 0 -33 8 50 14 31 3 9 92 -21 -32 58 40 -33 19 1 -32 26 23 -33 51 30 65 0 0 -33 13 16 14 31 2 9 91 -22 -33 3 6 -33 23 27 -32 30 49 -33 55 55 66 0 0 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39 44 -11 5 19 -122 0 0 -10 14 45 14 14 57 5 265 -3 -10 4 31 -10 24 59 - 9 32 4 -10 57 38 -121 0 0 -10 7 16 14 14 56 4 264 -2 - 9 57 3 -10 17 31 - 9 24 37 -10 50 8 -120 0 0 -10 0 0 14 14 56 3 264 -1 - 9 49 47 -10 10 14 - 9 17 22 -10 42 51 -119 0 0 - 9 52 57 14 14 55 2 264 0 - 9 42 44 -10 3 11 .. .. .. -10 35 47 Uncertainty in time = +/- 5 secs Prediction of 2009 Jun 30.0 Data for the target star ------------------------ * name: UCAC2 29715802 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 00 48.0647 DE: -06 11 47.309 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .032 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1724) Vladimir approx. diameter [km]: 35 approx. diameter ["]: .026 distance from Earth [AU]: 1.88300 * orbital information: orbit source: Preston date of fit: 2009 Jun 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 958 number of rejected observations: 36 time covered by the observations: 1932 Feb 28 - 2009 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.026, 91° remarks: * orbital elements for (1724) Vladimir : Mean anomaly = 183.68074230 deg Arg. of pericenter = 295.65420918 deg Long. of node = 164.10809771 deg Inclination = 12.23526313 deg Eccentricity = 0.05832438 Semimajor axis = 2.71149954 AU Perihelion dist = 2.55335301 AU Mag: H = 11.29, G = 0.15 Epoch of elements : MJD 55013.59900000 TDT (2009 Jul 01.599) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 1 1724 Vladimir 14h 23.0m UT 11.6 19 0 48.065- 6 11 47.31UCAC2 29715802 0.0 15.4 35 2.8 1.883 -2.119 -6.31 149.6680 -6.195 -34.78 23.07 14.3840 0.06980 -0.35056 -6.76615 -1.35004 -0.00038 -0.00161 2000 182.8862832009 628.00000295.654209164.108098 12.2352630.05832438 2.7114995 2.553353011.3 5.00.15 RATE 2.2074440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.041 91 2.59 0.041 0 55012.0020090701_715802 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 30, 15:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org