IOTA/IOTA-ES occultation update for (423) Diotima / TYC 6840-00435-1 event on 2007 Nov 01, 18:02 UT Visible from Africa Summary ------- On 2007 Nov 01 UT, the 209 km diameter asteroid (423) Diotima will occult a 11.0 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.1 mag (the magnitude of the asteroid) for at most 5.6 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: 98 * date and approx. time of event: 2007 Nov 01, 17:59 - 2007 Nov 01, 18:05 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 5.6 * Moon: 51 % sunlit, 139° distance * Sun: 48° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 209 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .029", 1° ) * approx speed of asteroid's shadow [km/s]: 37.3834 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6840-00435-1 by 423 Diotima on 2007 Nov 01 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 -132 0 0 .. .. .. .. .. .. .. .. .. 3 23 38 .. .. .. 2 37 12 .. .. .. -131 0 0 3 55 27 17 59 33 1 119 49 2 50 55 4 59 59 2 4 28 5 46 29 -130 0 0 3 22 41 17 59 33 2 119 50 2 18 7 4 27 15 1 31 39 5 13 46 -129 0 0 2 49 50 17 59 33 3 119 51 1 45 16 3 54 26 0 58 46 4 40 58 -128 0 0 2 16 56 17 59 34 4 119 52 1 12 21 3 21 33 0 25 51 4 8 6 -127 0 0 1 44 0 17 59 34 6 119 54 0 39 24 2 48 38 - 0 7 7 3 35 11 -126 0 0 1 11 2 17 59 34 7 119 55 0 6 26 2 15 40 - 0 40 5 3 2 14 -125 0 0 0 38 4 17 59 35 8 119 56 - 0 26 33 1 42 41 - 1 13 3 2 29 15 -124 0 0 0 5 6 17 59 35 9 119 57 - 0 59 30 1 9 43 - 1 46 1 1 56 16 -123 0 0 - 0 27 51 17 59 36 10 119 58 - 1 32 26 0 36 45 - 2 18 56 1 23 18 -122 0 0 - 1 0 45 17 59 36 11 119 59 - 2 5 19 0 3 50 - 2 51 48 0 50 22 -121 0 0 - 1 33 36 17 59 37 12 119 60 - 2 38 9 - 0 29 3 - 3 24 37 0 17 28 -120 0 0 - 2 6 23 17 59 38 14 119 61 - 3 10 54 - 1 1 51 - 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5 39 47 - 3 31 16 - 6 26 2 - 2 44 58 42 0 0 - 4 3 23 18 5 14 4 242 -44 - 5 7 41 - 2 59 4 - 5 53 59 - 2 12 44 43 0 0 - 3 31 6 18 5 14 3 242 -45 - 4 35 27 - 2 26 44 - 5 21 47 - 1 40 21 44 0 0 - 2 58 42 18 5 14 2 242 -46 - 4 3 5 - 1 54 16 - 4 49 27 - 1 7 52 45 0 0 - 2 26 10 18 5 14 0 242 -47 - 3 30 36 .. .. .. - 4 17 0 .. .. .. 46 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 3 44 26 .. .. .. Data for the target star ------------------------ * name: TYC 6840-00435-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 44 21.8295 DE: -28 21 19.622 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .028 ) * V mag [mag]: 11.0 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (423) Diotima approx. diameter [km]: 209 approx. diameter ["]: .082 distance from Earth [AU]: 3.51600 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1117 number of rejected observations: 116 time covered by the observations: 1904 Mar 12 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.007, 103° remarks: * orbital elements for (423) Diotima : Mean anomaly = 7.11920622 deg Arg. of pericenter = 204.28852552 deg Long. of node = 69.54699102 deg Inclination = 11.23675810 deg Eccentricity = 0.04088524 Semimajor axis = 3.06946351 AU Perihelion dist = 2.94396776 AU Mag: H = 7.14, G = 0.15 Epoch of elements : MJD 54405.75200000 TDT (2007 Nov 01.752) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 01 423 Diotima 18h 2.4m UT 11.0 17 44 21.829-28 21 19.62TYC 6840-00435-1 11.5 13.1 209 5.6 3.516 3.989 -3.44 -45.153 -28.354 -94.69 -14.48 18.0399 .00119 .02199 21.05516 -1.37811 0.00436 -0.00046 2000 6.0649908920071027.00000204.288526 69.546991 11.2367580.040885243.069463512.943967767.245 0.15 RATE 1.8327801 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.029 0.7 1.360 0.029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org