IOTA/IOTA-ES occultation update for (1724) Vladimir / UCAC2 29521429 event on 2009 Jul 07, 20:12 UT Visible from Summary ------- On 2009 Jul 07 UT, the 35 km diameter asteroid (1724) Vladimir will occult a 11.2 mag star in the constellation Scutum for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 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, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2009 Jul 07, 20:04 - 2009 Jul 07, 20:20 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 2.8 * Moon: 100 % sunlit, 18° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 3.05 * 1 sigma uncertainty interval [seconds]: +/- 9.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .090 +/- .078) * 1 sigma uncertainty ellipse (major, minor, PA): ( .090", .078", 90° ) * approx speed of asteroid's shadow [km/s]: 12.4653 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 29521429 by 1724 Vladimir on 2009 Jul 7 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 - 40 0 0 -30 17 23 20 20 57 1 97 -6 -30 7 29 -30 27 17 .. .. .. -31 27 52 - 39 0 0 -30 23 54 20 20 57 2 97 -7 -30 14 0 -30 33 47 .. .. .. -31 34 20 - 38 0 0 -30 30 9 20 20 57 3 96 -8 -30 20 16 -30 40 2 .. .. .. -31 40 33 - 37 0 0 -30 36 9 20 20 56 3 96 -9 -30 26 16 -30 46 2 -29 26 10 -31 46 31 - 36 0 0 -30 41 54 20 20 56 4 95 -10 -30 32 1 -30 51 46 -29 31 57 -31 52 13 - 35 0 0 -30 47 23 20 20 55 5 95 -10 -30 37 31 -30 57 16 -29 37 28 -31 57 41 - 34 0 0 -30 52 37 20 20 54 6 94 -11 -30 42 45 -31 2 29 -29 42 44 -32 2 53 - 33 0 0 -30 57 36 20 20 53 7 93 -12 -30 47 44 -31 7 28 -29 47 45 -32 7 50 - 32 0 0 -31 2 19 20 20 52 8 93 -13 -30 52 28 -31 12 11 -29 52 30 -32 12 32 - 31 0 0 -31 6 48 20 20 51 9 92 -14 -30 56 57 -31 16 39 -29 57 0 -32 16 59 - 30 0 0 -31 11 1 20 20 50 9 92 -15 -31 1 10 -31 20 52 -30 1 14 -32 21 10 - 29 0 0 -31 14 58 20 20 49 10 91 -15 -31 5 7 -31 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264 -5 - 0 32 25 - 0 52 14 .. .. .. - 1 52 53 146 0 0 - 0 35 2 20 4 31 1 264 -4 - 0 25 8 - 0 44 56 .. .. .. - 1 45 33 147 0 0 - 0 28 1 20 4 31 0 264 -3 .. .. .. - 0 37 55 .. .. .. - 1 38 30 Uncertainty in time = +/- 10 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 29521429 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 55 28.3287 DE: -06 30 15.645 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .072, .072 ) * V mag [mag]: 11.2 * 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]: 1.87900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 861 number of rejected observations: 36 time covered by the observations: 1932 Feb 28 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.054, 0.031, 91° remarks: * orbital elements for (1724) Vladimir : Mean anomaly = 185.06023359 deg Arg. of pericenter = 295.65328859 deg Long. of node = 164.10760347 deg Inclination = 12.23531628 deg Eccentricity = 0.05830365 Semimajor axis = 2.71155278 AU Perihelion dist = 2.55345935 AU Mag: H = 11.28, G = 0.15 Epoch of elements : MJD 55019.84200000 TDT (2009 Jul 07.842) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 7 1724 Vladimir 20h 12.7m UT 11.2 18 55 28.329- 6 30 15.65UCAC2 29521429 0.0 15.4 35 2.8 1.879 -2.135 -8.46 54.7568 -6.502 -121.93 22.50 20.2123 0.06797 -0.25567 -6.79992 -1.80629 0.00028 -0.00153 2000 182.8877312009 628.00000295.653289164.107603 12.2353160.05830365 2.7115528 2.553459411.3 5.00.15 RATE 2.2073800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.090 0.078 90 4.05 0.078 0 54545.5020090707_521429 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org