IOTA/IOTA-ES occultation update for (1166) Sakuntala / 2UCAC 17383687 event on 2007 Oct 03, 16:08 UT Visible from Australia Summary ------- On 2007 Oct 03 UT, the 29 km diameter asteroid (1166) Sakuntala will occult a 11.5 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 1.5 mag to 12.7 mag (the magnitude of the asteroid) for at most 1.8 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: 43 * date and approx. time of event: 2007 Oct 03, 16:02 - 2007 Oct 03, 16:14 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 1.8 * Moon: 47 % sunlit, 171° distance * Sun: 97° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 1.52 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .036", 98° ) * approx speed of asteroid's shadow [km/s]: 16.3577 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 17383687 by 1166 Sakuntala on 2007 Oct 03 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 - 60 0 0 -11 55 39 16 2 24 1 125 81 -12 5 38 -11 45 41 -12 36 1 .. .. .. - 59 0 0 -12 36 59 16 2 24 2 125 80 -12 46 59 -12 27 0 -13 17 25 .. .. .. - 58 0 0 -13 18 23 16 2 24 3 124 79 -13 28 24 -13 8 24 -13 58 53 .. .. .. - 57 0 0 -13 59 51 16 2 25 4 124 78 -14 9 52 -13 49 50 -14 40 23 -13 19 28 - 56 0 0 -14 41 19 16 2 25 5 124 77 -14 51 21 -14 31 18 -15 21 54 -14 0 54 - 55 0 0 -15 22 47 16 2 26 7 124 76 -15 32 50 -15 12 45 -16 3 24 -14 42 20 - 54 0 0 -16 4 14 16 2 27 8 123 75 -16 14 16 -15 54 11 -16 44 53 -15 23 44 - 53 0 0 -16 45 37 16 2 29 9 123 74 -16 55 40 -16 35 34 -17 26 17 -16 5 6 - 52 0 0 -17 26 55 16 2 30 10 123 73 -17 36 58 -17 16 52 -18 7 36 -16 46 23 - 51 0 0 -18 8 6 16 2 31 11 122 71 -18 18 10 -17 58 3 -18 48 48 -17 27 34 - 50 0 0 -18 49 10 16 2 33 12 122 70 -18 59 13 -18 39 7 -19 29 52 -18 8 37 - 49 0 0 -19 30 4 16 2 35 14 122 69 -19 40 7 -19 20 1 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Data for the target star ------------------------ * name: 2UCAC 17383687 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 19 36.9284 DE: -34 04 53.373 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .034 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1166) Sakuntala approx. diameter [km]: 29 approx. diameter ["]: .024 distance from Earth [AU]: 1.66100 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 601 number of rejected observations: 30 time covered by the observations: 1930 Jun 30 - 2007 Sep 24 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.014, 113° remarks: * orbital elements for (1166) Sakuntala : Mean anomaly = 14.15441600 deg Arg. of pericenter = 189.15999732 deg Long. of node = 106.78850088 deg Inclination = 18.89397330 deg Eccentricity = 0.20704346 Semimajor axis = 2.53631431 AU Perihelion dist = 2.01118702 AU Mag: H = 10.31, G = 0.15 Epoch of elements : MJD 54376.67300000 TDT (2007 Oct 03.673) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 03 1166 Sakuntala 16h 8.7m UT 11.5 19 19 36.928-34 4 53.372UCAC 17383687 0.0 12.7 29 1.8 1.661 3.934 -0.78 35.752 -34.082 -64.89 -3.99 16.1445 -.00485 -.25685 9.23151 -0.14947 0.00520 0.00086 2000 12.52616782007 927.00000189.159997106.788501 18.8939730.207043462.536314312.01118702 8.85 0.15 RATE 2.4400541 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.042 0.036 98.1 2.520 0.037 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org