IOTA/IOTA-ES occultation update for (1351) Uzbekistania / TYC 7422-01354-1 event on 2007 Jul 01, 20:16 UT Visible from SE Asia, Indonesia, Africa Summary ------- On 2007 Jul 01 UT, the 65 km diameter asteroid (1351) Uzbekistania will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across SE Asia, Indonesia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.5 mag (the magnitude of the asteroid) for at most 4.9 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: 72 * date and approx. time of event: 2007 Jul 01, 20:09 - 2007 Jul 01, 20:23 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 4.9 * Moon: 98 % sunlit, 15° distance * Sun: 165° distance * rough path description: SE Asia, Indonesia, Africa The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .030", 85° ) * approx speed of asteroid's shadow [km/s]: 13.3445 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7422-01354-1 by 1351 Uzbekistania on 2007 Jul 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 - 17 0 0 14 52 21 20 23 49 0 128 -10 .. .. .. 14 27 6 .. .. .. .. .. .. - 16 0 0 14 7 14 20 23 49 1 128 -11 14 32 28 13 42 8 15 13 6 .. .. .. - 15 0 0 13 22 38 20 23 49 2 128 -12 13 47 44 12 57 40 14 28 8 .. .. .. - 14 0 0 12 38 35 20 23 48 4 129 -14 13 3 32 12 13 45 13 43 42 .. .. .. - 13 0 0 11 55 5 20 23 47 5 129 -15 12 19 54 11 30 24 12 59 50 10 51 8 - 12 0 0 11 12 10 20 23 46 6 129 -16 11 36 50 10 47 37 12 16 33 10 8 34 - 11 0 0 10 29 51 20 23 45 7 129 -17 10 54 23 10 5 27 11 33 51 9 26 37 - 10 0 0 9 48 9 20 23 43 8 129 -18 10 12 32 9 23 53 10 51 47 8 45 16 - 9 0 0 9 7 5 20 23 42 10 130 -20 9 31 19 8 42 57 10 10 20 8 4 33 - 8 0 0 8 26 39 20 23 40 11 130 -21 8 50 45 8 2 40 9 29 33 7 24 29 - 7 0 0 7 46 53 20 23 37 12 130 -22 8 10 51 7 23 2 8 49 24 6 45 4 - 6 0 0 7 7 47 20 23 35 13 130 -23 7 31 37 6 44 4 8 9 57 6 6 20 - 5 0 0 6 29 23 20 23 32 14 130 -24 6 53 4 6 5 48 7 31 10 5 28 16 - 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Data for the target star ------------------------ * name: TYC 7422-01354-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 08 30.4066 DE: -36 22 46.475 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .022 ) * V mag [mag]: 11.6 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1351) Uzbekistania approx. diameter [km]: 65 approx. diameter ["]: .038 distance from Earth [AU]: 2.36400 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 624 number of rejected observations: 48 time covered by the observations: 1917 Sep 25 - 2007 Jun 13 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.021, 82° remarks: * orbital elements for (1351) Uzbekistania : Mean anomaly = 219.11983290 deg Arg. of pericenter = 58.19295169 deg Long. of node = 9.58444893 deg Inclination = 9.66477580 deg Eccentricity = 0.06199920 Semimajor axis = 3.19939406 AU Perihelion dist = 3.00103419 AU Mag: H = 9.83, G = 0.15 Epoch of elements : MJD 54282.84500000 TDT (2007 Jul 01.845) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 01 1351 Uzbekistania 20h 16.7m UT 11.6 19 8 30.407-36 22 46.47TYC 7422-01354-1 12.5 14.5 65 4.9 2.364 -2.295 -4.15 63.444 -36.378 -123.21 23.09 20.2787 -.06715 .44875 -7.44876 -1.11659 -0.00062 0.00127 2000 218.6298452007 629.00000 58.192952 9.584449 9.6647760.061999203.199394063.001034199.6 5 0.15 RATE 1.7222750 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.044 0.030 85.0 1.800 0.030 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 01:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org