IOTA/IOTA-ES occultation update for (3642) Frieden / 2UCAC 26993803 event on 2007 Jul 03, 23:56 UT Visible from Madagascar, S Africa, Argentina, Chile Summary ------- On 2007 Jul 03 UT, the 35 km diameter asteroid (3642) Frieden will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across Madagascar, S Africa, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 15.4 mag (the magnitude of the asteroid) for at most 2.7 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: 26 * date and approx. time of event: 2007 Jul 03, 23:47 - 2007 Jul 04, 00:03 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.7 * Moon: 87 % sunlit, 33° distance * Sun: 167° distance * rough path description: Madagascar, S Africa, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 2.63 * 1 sigma uncertainty interval [seconds]: +/- 10.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .101 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .101", .057", 91° ) * approx speed of asteroid's shadow [km/s]: 12.8514 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 26993803 by 3642 Frieden on 2007 Jul 03 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 - 90 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -36 42 21 - 89 0 0 -35 53 7 24 3 58 1 106 -14 -35 42 58 -36 3 18 .. .. .. -36 56 56 - 88 0 0 -36 7 26 24 3 58 2 106 -15 -35 57 18 -36 17 36 .. .. .. -37 11 7 - 87 0 0 -36 21 22 24 3 58 2 105 -16 -36 11 14 -36 31 30 .. .. .. -37 24 55 - 86 0 0 -36 34 54 24 3 57 3 105 -16 -36 24 47 -36 45 0 .. .. .. -37 38 20 - 85 0 0 -36 48 2 24 3 57 4 104 -17 -36 37 57 -36 58 8 -35 45 0 -37 51 21 - 84 0 0 -37 0 47 24 3 56 5 103 -18 -36 50 43 -37 10 51 -35 57 51 -38 4 0 - 83 0 0 -37 13 8 24 3 55 6 103 -19 -37 3 5 -37 23 12 -36 10 20 -38 16 14 - 82 0 0 -37 25 7 24 3 55 7 102 -20 -37 15 4 -37 35 9 -36 22 24 -38 28 6 - 81 0 0 -37 36 42 24 3 54 7 102 -20 -37 26 40 -37 46 43 -36 34 6 -38 39 35 - 80 0 0 -37 47 53 24 3 53 8 101 -21 -37 37 53 -37 57 54 -36 45 24 -38 50 40 - 79 0 0 -37 58 42 24 3 52 9 100 -22 -37 48 43 -38 8 42 -36 56 18 -39 1 23 - 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2007 Jun 27 1 sigma uncertainty ellipse (major, minor, PA): 0.074, 0.048, 92° remarks: * orbital elements for (3642) Frieden : Mean anomaly = 133.51738628 deg Arg. of pericenter = 16.84810631 deg Long. of node = 131.33540327 deg Inclination = 13.46603828 deg Eccentricity = 0.08056684 Semimajor axis = 2.78791851 AU Perihelion dist = 2.56330472 AU Mag: H = 11.04, G = 0.15 Epoch of elements : MJD 54284.99700000 TDT (2007 Jul 03.997) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 03 3642 Frieden 23h 56.0m UT 10.9 19 30 28.395-13 41 0.142UCAC 26993803 0.0 15.4 35 2.7 1.953 -2.071 -12.53 12.005 -13.680 -177.92 22.93 23.9326 .09361 -.22540 -6.69934 -2.78114 -0.00092 -0.00092 2000 132.4593672007 629.00000 16.848106131.335403 13.4660380.080566842.787918512.5633047211.25 0.15 RATE 2.1173080 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.101 0.057 91.1 3.630 0.065 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org