IOTA/IOTA-ES occultation update for (423) Diotima / TYC 6226-01378-1 event on 2007 Mar 09, 15:26 UT Visible from Fiji, Pacific Islands, Papua New Guinea Summary ------- On 2007 Mar 09 UT, the 209 km diameter asteroid (423) Diotima will occult a 9.9 mag star in the constellation Ophiuchus for observers along a path across Fiji, Pacific Islands, Papua New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 12.8 mag (the magnitude of the asteroid) for at most 14.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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 Mar 09, 15:19 - 2007 Mar 09, 15:33 UT * magnitude of target star: 9.9 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 14.2 * Moon: 74 % sunlit, 25° distance * Sun: 94° distance * rough path description: Fiji, Pacific Islands, Papua New Guinea The occultation path -------------------- * approximate projected width [km]: 211 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .021", 97° ) * approx speed of asteroid's shadow [km/s]: 14.7397 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6226-01378-1 by 423 Diotima on 2007 Mar 09 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 129 0 0 5 20 41 15 19 39 0 110 -86 4 19 38 6 21 33 3 55 10 .. .. .. 130 0 0 4 59 6 15 19 39 1 110 -87 3 57 57 6 0 3 3 33 26 6 24 24 131 0 0 4 37 11 15 19 39 3 110 -88 3 35 56 5 38 15 3 11 23 6 2 38 132 0 0 4 14 58 15 19 40 4 110 -89 3 13 37 5 16 8 2 49 2 5 40 33 133 0 0 3 52 27 15 19 40 5 110 -89 2 51 0 4 53 43 2 26 22 5 18 10 134 0 0 3 29 38 15 19 41 6 110 -88 2 28 5 4 31 0 2 3 25 4 55 29 135 0 0 3 6 32 15 19 42 7 110 -87 2 4 53 4 7 59 1 40 10 4 32 31 136 0 0 2 43 8 15 19 43 8 110 -86 1 41 24 3 44 41 1 16 38 4 9 15 137 0 0 2 19 28 15 19 44 9 110 -85 1 17 38 3 21 7 0 52 50 3 45 43 138 0 0 1 55 32 15 19 46 10 110 -84 0 53 36 2 57 16 0 28 46 3 21 55 139 0 0 1 31 20 15 19 47 11 110 -83 0 29 19 2 33 10 0 4 27 2 57 50 140 0 0 1 6 53 15 19 49 12 110 -82 0 4 47 2 8 48 - 0 20 7 2 33 31 141 0 0 0 42 11 15 19 51 13 110 -81 - 0 20 0 1 44 11 - 0 44 56 2 8 56 142 0 0 0 17 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Data for the target star ------------------------ * name: TYC 6226-01378-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 53 43.3891 DE: -19 24 24.993 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 9.9 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (423) Diotima approx. diameter [km]: 209 approx. diameter ["]: .106 distance from Earth [AU]: 2.72900 * orbital information: orbit source: Preston date of fit: 2007 Feb 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1034 number of rejected observations: 115 time covered by the observations: 1904 Mar 12 - 2006 Jun 01 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.009, 109° remarks: * orbital elements for (423) Diotima : Mean anomaly = 322.50460281 deg Arg. of pericenter = 205.55069974 deg Long. of node = 69.55214560 deg Inclination = 11.24091364 deg Eccentricity = 0.04123016 Semimajor axis = 3.06976302 AU Perihelion dist = 2.94319621 AU Mag: H = 7.10, G = 0.15 Epoch of elements : MJD 54168.64400000 TDT (2007 Mar 09.644) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Mar 09 423 Diotima 15h 26.8m UT 9.9 16 53 43.389-19 24 24.99TYC 6226-01378-1 10.0 12.8 209 14.2 2.729 1.836 -6.60 214.793 -19.405 310.96 -4.48 15.4465 -.03496 -.14339 8.06310 -2.04961 -0.00582 0.00065 2000 320.9205792007 3 1.00000205.550700 69.552146 11.2409140.041230163.069763022.943196217.245 0.15 RATE 1.8325120 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.024 0.021 97.2 1.200 0.021 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Feb 24, 03:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org