IOTA/IOTA-ES occultation update for (924) Toni / TYC 5731-01734-1 event on 2009 Jul 06, 09:54 UT Visible from Summary ------- On 2009 Jul 06 UT, the 69 km diameter asteroid (924) Toni will occult a 9.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 13.3 mag (the magnitude of the asteroid) for at most 6.3 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: 90 * date and approx. time of event: 2009 Jul 06, 09:45 - 2009 Jul 06, 10:03 UT * magnitude of target star: 9.4 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 6.3 * Moon: 99 % sunlit, 22° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 0.52 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .026", 88° ) * approx speed of asteroid's shadow [km/s]: 11.0076 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5731-01734-1 by 924 Toni on 2009 Jul 6 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 119 0 0 -37 23 20 10 3 8 1 105 -12 -37 2 36 -37 44 7 -36 41 6 -38 5 46 120 0 0 -37 36 23 10 3 8 1 105 -13 -37 15 41 -37 57 8 -36 54 12 -38 18 46 121 0 0 -37 49 7 10 3 7 2 104 -14 -37 28 27 -38 9 51 -37 7 0 -38 31 27 122 0 0 -38 1 34 10 3 7 3 103 -15 -37 40 56 -38 22 16 -37 19 30 -38 43 51 123 0 0 -38 13 43 10 3 6 4 103 -16 -37 53 6 -38 34 23 -37 31 43 -38 55 56 124 0 0 -38 25 35 10 3 6 5 102 -16 -38 4 59 -38 46 13 -37 43 37 -39 7 44 125 0 0 -38 37 8 10 3 5 5 101 -17 -38 16 34 -38 57 45 -37 55 13 -39 19 14 126 0 0 -38 48 23 10 3 4 6 101 -18 -38 27 51 -39 8 58 -38 6 32 -39 30 26 127 0 0 -38 59 20 10 3 3 7 100 -19 -38 38 49 -39 19 54 -38 17 32 -39 41 20 128 0 0 -39 10 0 10 3 2 8 100 -20 -38 49 30 -39 30 32 -38 28 15 -39 51 57 129 0 0 -39 20 21 10 3 1 9 99 -20 -38 59 53 -39 40 52 -38 38 39 -40 2 15 130 0 0 -39 30 25 10 2 59 9 98 -21 -39 9 58 -39 50 54 -38 48 45 -40 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3 28 - 7 45 2 - 6 41 55 - 8 6 44 - 56 0 0 - 7 7 52 9 45 19 10 259 -4 - 6 47 8 - 7 28 40 - 6 25 37 - 7 50 20 - 55 0 0 - 6 51 49 9 45 17 9 258 -3 - 6 31 6 - 7 12 34 - 6 9 37 - 7 34 13 - 54 0 0 - 6 36 3 9 45 16 8 258 -2 - 6 15 21 - 6 56 47 - 5 53 53 - 7 18 24 - 53 0 0 - 6 20 35 9 45 14 7 258 0 - 5 59 55 - 6 41 17 - 5 38 28 - 7 2 53 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5731-01734-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 32 12.8603 DE: -12 23 27.765 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 9.4 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (924) Toni approx. diameter [km]: 69 approx. diameter ["]: .053 distance from Earth [AU]: 1.78800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 957 number of rejected observations: 99 time covered by the observations: 1906 Jan 22 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.018, 87° remarks: * orbital elements for (924) Toni : Mean anomaly = 297.05713463 deg Arg. of pericenter = 219.37540329 deg Long. of node = 150.53129625 deg Inclination = 8.99677455 deg Eccentricity = 0.15946131 Semimajor axis = 2.93662329 AU Perihelion dist = 2.46834550 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 55018.41300000 TDT (2009 Jul 06.413) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 6 924 Toni 9h 54.2m UT 9.4 19 32 12.860-12 23 27.76TYC 5731-01734-1 10.4 13.3 69 6.3 1.788 -2.000 -8.73 -140.0022 -12.389 32.66 22.65 9.9026 0.10457 -0.35089 -5.95433 -1.77396 -0.00066 -0.00099 2000 295.4094182009 628.00000219.375403150.531296 8.9967750.15946131 2.9366233 2.4683455 9.4 5.00.15 RATE 1.9585370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.026 88 1.52 0.028 0 54545.5020090706_1734-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org