IOTA/IOTA-ES occultation update for (924) Toni / TYC 5730-01460-1 event on 2009 Jul 11, 17:36 UT Visible from Australia Summary ------- On 2009 Jul 11 UT, the 69 km diameter asteroid (924) Toni will occult a 12.1 mag star in the constellation Sagittarius 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 1.4 mag to 13.2 mag (the magnitude of the asteroid) for at most 6.1 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: 62 * date and approx. time of event: 2009 Jul 11, 17:27 - 2009 Jul 11, 17:44 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 6.1 * Moon: 84 % sunlit, 45° distance * Sun: 171° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 1.00 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .047", 360° ) * approx speed of asteroid's shadow [km/s]: 11.3971 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5730-01460-1 by 924 Toni on 2009 Jul 11 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 - 5 0 0 -41 32 59 17 44 45 0 107 -7 -41 11 40 -41 54 21 .. .. .. -42 37 18 - 4 0 0 -41 46 34 17 44 45 1 106 -8 -41 25 17 -42 7 55 -40 42 54 -42 50 47 - 3 0 0 -41 59 50 17 44 45 2 105 -9 -41 38 35 -42 21 9 -40 56 16 -43 3 57 - 2 0 0 -42 12 47 17 44 44 3 105 -9 -41 51 34 -42 34 4 -41 9 19 -43 16 48 - 1 0 0 -42 25 25 17 44 44 3 104 -10 -42 4 14 -42 46 40 -41 22 3 -43 29 20 0 0 0 -42 37 44 17 44 43 4 103 -11 -42 16 35 -42 58 57 -41 34 28 -43 41 33 1 0 0 -42 49 44 17 44 43 5 103 -12 -42 28 37 -43 10 55 -41 46 34 -43 53 27 2 0 0 -43 1 25 17 44 42 6 102 -12 -42 40 20 -43 22 34 -41 58 20 -44 5 2 3 0 0 -43 12 47 17 44 41 6 101 -13 -42 51 44 -43 33 54 -42 9 48 -44 16 19 4 0 0 -43 23 50 17 44 40 7 101 -14 -43 2 49 -43 44 55 -42 20 57 -44 27 16 5 0 0 -43 34 35 17 44 39 8 100 -15 -43 13 35 -43 55 38 -42 31 46 -44 37 55 6 0 0 -43 45 0 17 44 38 9 99 -15 -43 24 2 -44 6 2 -42 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- 8 23 35 -10 31 51 180 0 0 - 9 9 34 17 28 0 12 259 -12 - 8 48 15 - 9 30 57 - 8 5 48 -10 13 53 -179 0 0 - 8 52 1 17 27 58 11 259 -11 - 8 30 44 - 9 13 22 - 7 48 21 - 9 56 14 -178 0 0 - 8 34 47 17 27 56 10 258 -10 - 8 13 32 - 8 56 6 - 7 31 12 - 9 38 55 -177 0 0 - 8 17 53 17 27 54 9 258 -9 - 7 56 39 - 8 39 10 - 7 14 23 - 9 21 55 -176 0 0 - 8 1 18 17 27 52 8 258 -8 - 7 40 7 - 8 22 33 - 6 57 54 - 9 5 15 -175 0 0 - 7 45 4 17 27 51 7 258 -7 - 7 23 54 - 8 6 17 - 6 41 45 - 8 48 55 -174 0 0 - 7 29 11 17 27 50 6 258 -6 - 7 8 3 - 7 50 22 - 6 25 57 - 8 32 56 -173 0 0 - 7 13 38 17 27 49 5 258 -5 - 6 52 32 - 7 34 48 - 6 10 30 - 8 17 18 -172 0 0 - 6 58 27 17 27 48 4 258 -4 - 6 37 22 - 7 19 35 - 5 55 24 - 8 2 1 -171 0 0 - 6 43 37 17 27 47 3 258 -3 - 6 22 34 - 7 4 43 - 5 40 39 - 7 47 6 -170 0 0 - 6 29 9 17 27 47 2 257 -2 - 6 8 8 - 6 50 13 .. .. .. - 7 32 33 -169 0 0 - 6 15 3 17 27 46 1 257 -1 - 5 54 3 - 6 36 6 .. .. .. - 7 18 22 Uncertainty in time = +/- 6 secs Prediction of 2009 Jun 25.0 Data for the target star ------------------------ * name: TYC 5730-01460-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 27 52.2092 DE: -12 43 22.317 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .051 ) * V mag [mag]: 12.1 * B mag [mag]: 12.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (924) Toni approx. diameter [km]: 69 approx. diameter ["]: .054 distance from Earth [AU]: 1.77300 * orbital information: orbit source: Preston date of fit: 2009 Jun 24 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1036 number of rejected observations: 99 time covered by the observations: 1906 Jan 22 - 2009 Jun 07 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 87° remarks: * orbital elements for (924) Toni : Mean anomaly = 298.10627733 deg Arg. of pericenter = 219.36795328 deg Long. of node = 150.53103410 deg Inclination = 8.99682038 deg Eccentricity = 0.15946318 Semimajor axis = 2.93668635 AU Perihelion dist = 2.46839299 AU Mag: H = 9.33, G = 0.15 Epoch of elements : MJD 55023.73300000 TDT (2009 Jul 11.733) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 11 924 Toni 17h 36.3m UT 12.1 19 27 52.209-12 43 22.32TYC 5730-01460-1 13.0 13.2 69 6.1 1.773 -2.073 -9.96 98.1383 -12.721 -82.67 22.02 17.6045 0.12853 -0.39190 -6.11184 -2.00663 -0.00011 -0.00090 2000 297.3751792009 7 8.00000219.367953150.531034 8.9968200.15946318 2.9366864 2.4683930 9.4 5.00.15 RATE 1.9584730 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.047 360 2.00 0.053 0 55007.0020090711_1460-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 24, 17:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org