IOTA/IOTA-ES occultation update for (2271) Kiso / 2UCAC 24388068 event on 2007 Jul 05, 02:32 UT Visible from Brazil, Bolivia Summary ------- On 2007 Jul 05 UT, the 32 km diameter asteroid (2271) Kiso will occult a 11.1 mag star in the constellation Ophiuchus for observers along a path across Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 14.9 mag (the magnitude of the asteroid) for at most 3.7 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: 38 * date and approx. time of event: 2007 Jul 05, 02:19 - 2007 Jul 05, 02:44 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 3.7 * Moon: 78 % sunlit, 80° distance * Sun: 156° distance * rough path description: Brazil, Bolivia The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 1.76 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .063 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .045", 93° ) * approx speed of asteroid's shadow [km/s]: 8.5716 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 24388068 by 2271 Kiso on 2007 Jul 05 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 -154 0 0 1 3 0 2 44 35 1 109 22 1 12 15 0 53 46 1 44 49 0 21 16 -153 0 0 0 42 21 2 44 35 2 109 21 0 51 35 0 33 7 1 24 8 0 0 38 -152 0 0 0 21 49 2 44 34 3 109 20 0 31 3 0 12 35 1 3 34 - 0 19 53 -151 0 0 0 1 25 2 44 34 4 109 19 0 10 39 - 0 7 48 0 43 9 - 0 40 14 -150 0 0 - 0 18 50 2 44 33 5 109 18 - 0 9 37 - 0 28 3 0 22 52 - 1 0 28 -149 0 0 - 0 38 56 2 44 31 6 109 17 - 0 29 43 - 0 48 8 0 2 44 - 1 20 32 -148 0 0 - 0 58 52 2 44 30 7 109 16 - 0 49 40 - 1 8 4 - 0 17 15 - 1 40 26 -147 0 0 - 1 18 39 2 44 28 8 109 15 - 1 9 27 - 1 27 50 - 0 37 4 - 2 0 11 -146 0 0 - 1 38 15 2 44 26 9 109 14 - 1 29 4 - 1 47 26 - 0 56 42 - 2 19 45 -145 0 0 - 1 57 41 2 44 23 10 109 13 - 1 48 30 - 2 6 52 - 1 16 10 - 2 39 9 -144 0 0 - 2 16 56 2 44 21 11 109 12 - 2 7 46 - 2 26 6 - 1 35 27 - 2 58 21 -143 0 0 - 2 36 0 2 44 18 12 109 11 - 2 26 50 - 2 45 10 - 1 54 33 - 3 17 23 -142 0 0 - 2 54 52 2 44 15 13 109 10 - 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2007 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.040, 96° remarks: * orbital elements for (2271) Kiso : Mean anomaly = 320.37795694 deg Arg. of pericenter = 175.70037158 deg Long. of node = 136.53718122 deg Inclination = 3.38315948 deg Eccentricity = 0.06058714 Semimajor axis = 2.76059927 AU Perihelion dist = 2.59334245 AU Mag: H = 10.91, G = 0.15 Epoch of elements : MJD 54286.10600000 TDT (2007 Jul 05.106) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 05 2271 Kiso 2h 32.3m UT 11.1 17 13 58.656-19 0 26.402UCAC 24388068 0.0 14.9 32 3.7 1.674 -1.786 -1.92 -62.286 -19.007 -216.94 22.83 2.5376 -.00804 .09942 -4.82424 -0.36497 0.00212 -0.00052 2000 319.0658902007 629.00000175.700372136.537181 3.3831590.060587142.760599272.5933424511.15 0.15 RATE 2.1488150 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.063 0.045 93.5 2.760 0.046 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 04, 18:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org