IOTA/IOTA-ES occultation update for (405) Thia / TYC 5725-02296-1 event on 2007 Jul 12, 18:05 UT Visible from Australia, Africa Summary ------- On 2007 Jul 12 UT, the 125 km diameter asteroid (405) Thia will occult a 9.2 mag star in the constellation Aquila for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 11.7 mag (the magnitude of the asteroid) for at most 11.4 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: 99 * date and approx. time of event: 2007 Jul 12, 17:56 - 2007 Jul 12, 18:14 UT * magnitude of target star: 9.2 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 11.4 * Moon: 4 % sunlit, 144° distance * Sun: 165° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .029", 78° ) * approx speed of asteroid's shadow [km/s]: 10.9928 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5725-02296-1 by 405 Thia on 2007 Jul 12 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 2 0 0 .. .. .. .. .. .. .. .. .. .. .. .. -10 45 20 .. .. .. -11 3 15 3 0 0 -10 18 0 18 14 50 1 98 -9 - 9 42 22 -10 53 45 - 9 24 35 -11 11 40 4 0 0 -10 26 31 18 14 50 2 98 -10 - 9 50 52 -11 2 17 - 9 33 5 -11 20 12 5 0 0 -10 35 9 18 14 50 3 97 -11 - 9 59 30 -11 10 55 - 9 41 42 -11 28 51 6 0 0 -10 43 53 18 14 49 4 97 -12 -10 8 13 -11 19 40 - 9 50 26 -11 37 36 7 0 0 -10 52 44 18 14 48 5 97 -13 -10 17 4 -11 28 31 - 9 59 16 -11 46 28 8 0 0 -11 1 41 18 14 47 6 97 -14 -10 26 0 -11 37 29 -10 8 12 -11 55 25 9 0 0 -11 10 45 18 14 46 7 97 -14 -10 35 3 -11 46 33 -10 17 15 -12 4 29 10 0 0 -11 19 54 18 14 45 8 97 -15 -10 44 12 -11 55 42 -10 26 23 -12 13 39 11 0 0 -11 29 8 18 14 43 9 96 -16 -10 53 26 -12 4 57 -10 35 37 -12 22 55 12 0 0 -11 38 28 18 14 41 10 96 -17 -11 2 45 -12 14 18 -10 44 56 -12 32 15 13 0 0 -11 47 54 18 14 40 11 96 -18 -11 12 10 -12 23 44 -10 54 21 -12 41 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17 -25 40 20 -24 11 35 -25 58 10 175 0 0 -24 58 43 17 56 40 15 268 -15 -24 23 14 -25 34 19 -24 5 32 -25 52 9 176 0 0 -24 52 33 17 56 37 14 268 -14 -24 17 3 -25 28 9 -23 59 21 -25 46 0 177 0 0 -24 46 13 17 56 35 13 267 -13 -24 10 43 -25 21 50 -23 53 0 -25 39 41 178 0 0 -24 39 45 17 56 33 12 267 -13 -24 4 14 -25 15 23 -23 46 31 -25 33 14 179 0 0 -24 33 8 17 56 31 11 266 -12 -23 57 37 -25 8 46 -23 39 54 -25 26 38 180 0 0 -24 26 23 17 56 29 11 266 -11 -23 50 51 -25 2 2 -23 33 7 -25 19 53 -179 0 0 -24 19 29 17 56 27 10 266 -10 -23 43 57 -24 55 8 -23 26 13 -25 13 0 -178 0 0 -24 12 27 17 56 26 9 265 -9 -23 36 54 -24 48 7 -23 19 9 -25 5 59 -177 0 0 -24 5 16 17 56 24 8 265 -8 -23 29 42 -24 40 56 -23 11 58 -24 58 49 -176 0 0 -23 57 57 17 56 23 7 264 -7 -23 22 23 -24 33 38 -23 4 38 -24 51 31 -175 0 0 -23 50 30 17 56 22 6 264 -6 -23 14 55 -24 26 12 -22 57 10 -24 44 5 -174 0 0 -23 42 55 17 56 21 5 264 -5 -23 7 19 -24 18 37 -22 49 34 -24 36 31 -173 0 0 -23 35 12 17 56 20 4 263 -5 -22 59 35 -24 10 55 -22 41 49 -24 28 48 -172 0 0 -23 27 21 17 56 20 3 263 -4 -22 51 44 -24 3 4 -22 33 57 -24 20 58 -171 0 0 -23 19 22 17 56 19 2 262 -3 -22 43 44 -23 55 6 -22 25 58 -24 13 0 -170 0 0 -23 11 15 17 56 19 1 262 -2 -22 35 37 -23 47 0 -22 17 50 -24 4 55 -169 0 0 -23 3 1 17 56 19 0 262 -1 -22 27 22 -23 38 47 -22 9 35 -23 56 42 Data for the target star ------------------------ * name: TYC 5725-02296-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 49 11.2649 DE: -07 53 04.019 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .025 ) * V mag [mag]: 9.2 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (405) Thia approx. diameter [km]: 125 approx. diameter ["]: .120 distance from Earth [AU]: 1.43900 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 654 number of rejected observations: 84 time covered by the observations: 1903 Jun 27 - 2007 Jun 24 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.014, 74° remarks: * orbital elements for (405) Thia : Mean anomaly = 62.78074150 deg Arg. of pericenter = 309.19249844 deg Long. of node = 255.29729426 deg Inclination = 11.95209238 deg Eccentricity = 0.24486240 Semimajor axis = 2.58383958 AU Perihelion dist = 1.95115442 AU Mag: H = 8.44, G = 0.15 Epoch of elements : MJD 54293.75400000 TDT (2007 Jul 12.754) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 12 405 Thia 18h 5.6m UT 9.2 19 49 11.265- 7 53 4.02TYC 5725-02296-1 10.7 11.7 125 11.4 1.439 -2.535 4.25 95.649 -7.886 -89.98 21.94 18.0929 -.03203 -.28442 -6.16545 0.69610 -0.00052 -0.00133 2000 61.88990042007 7 9.00000309.192498255.297294 11.9520920.244862402.583839581.951154428.465 0.15 RATE 2.3730438 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.034 0.029 78.2 1.250 0.029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 05:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org