IOTA/IOTA-ES occultation update for (423) Diotima / UCAC2 20668224 event on 2007 Oct 02, 11:37 UT Visible from N Australia Summary ------- On 2007 Oct 02 UT, the 209 km diameter asteroid (423) Diotima will occult a 11.7 mag star in the constellation Ophiuchus for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.0 mag (the magnitude of the asteroid) for at most 7.4 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: 99 * date and approx. time of event: 2007 Oct 02, 11:34 - 2007 Oct 02, 11:41 UT * midpoint of event [JD]: 2454375.9846 * magnitude of target star: 11.7 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 7.4 * Moon: 60 % sunlit, 170° distance * Sun: 68° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 211 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 2° ) * approx speed of asteroid's shadow [km/s]: 28.1478 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 20668224 by 423 Diotima on 2007 Oct 02 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 - 12 0 0 .. .. .. .. .. .. .. .. .. 12 53 40 .. .. .. 12 14 56 .. .. .. - 11 0 0 13 26 47 11 34 5 1 118 68 12 22 4 14 31 39 11 43 19 15 10 40 - 10 0 0 12 55 4 11 34 5 2 119 69 11 50 17 14 0 0 11 11 29 14 39 2 - 9 0 0 12 23 8 11 34 5 3 119 70 11 18 18 13 28 8 10 39 28 14 7 13 - 8 0 0 11 51 2 11 34 5 4 119 71 10 46 8 12 56 5 10 7 16 13 35 11 - 7 0 0 11 18 45 11 34 6 5 119 72 10 13 49 12 23 51 9 34 55 13 2 59 - 6 0 0 10 46 19 11 34 6 7 119 73 9 41 21 11 51 27 9 2 25 12 30 37 - 5 0 0 10 13 45 11 34 7 8 120 74 9 8 44 11 18 55 8 29 48 11 58 7 - 4 0 0 9 41 4 11 34 7 9 120 75 8 36 1 10 46 16 7 57 3 11 25 28 - 3 0 0 9 8 15 11 34 8 10 120 76 8 3 11 10 13 29 7 24 13 10 52 42 - 2 0 0 8 35 22 11 34 9 11 120 77 7 30 16 9 40 36 6 51 17 10 19 50 - 1 0 0 8 2 23 11 34 10 12 120 78 6 57 17 9 7 39 6 18 18 9 46 53 0 0 0 7 29 21 11 34 11 13 120 78 6 24 15 8 34 37 5 45 15 9 13 51 1 0 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Data for the target star ------------------------ * name: UCAC2 20668224 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 00 04.2969 DE: -27 17 53.712 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .026 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 255.1379151099 DE(deg): -27.3120733655 * Equation of equinoxes (radians) : 0.000029254516634 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (423) Diotima approx. diameter [km]: 209 approx. diameter ["]: .091 distance from Earth [AU]: 3.16900 * orbital information: orbit source: Preston date of fit: 2007 Aug 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1111 number of rejected observations: 116 time covered by the observations: 1904 Mar 12 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.008, 109° remarks: * orbital elements for (423) Diotima : Mean anomaly = 1.43919601 deg Arg. of pericenter = 204.43012789 deg Long. of node = 69.54903856 deg Inclination = 11.23747698 deg Eccentricity = 0.04100597 Semimajor axis = 3.06987325 AU Perihelion dist = 2.94399012 AU Mag: H = 7.14, G = 0.15 Epoch of elements : MJD 54375.48500000 TDT (2007 Oct 02.485) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 02 423 Diotima 11h 37.8m UT 11.7 17 0 4.297-27 17 53.71UCAC2 20668224 0.0 13.0 209 7.4 3.169 3.269 -6.69 69.748 -27.296 2.91 -3.53 11.6304 .01695 .11847 15.70342 -2.41066 0.00531 -0.00072 2000 0.434117392007 927.00000204.430128 69.549039 11.2374770.041005973.069873252.943990127.245 0.15 RATE 1.8324132 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.024 1.6 1.300 0.027 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org