IOTA/IOTA-ES occultation update for (667) Denise / 2UCAC 33383658 event on 2007 Sep 01, 08:00 UT Visible from Venezuela Summary ------- On 2007 Sep 01 UT, the 81 km diameter asteroid (667) Denise will occult a 11.3 mag star in the constellation Canis Minor for observers along a path across Venezuela. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 14.3 mag (the magnitude of the asteroid) for at most 2.0 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: 58 * date and approx. time of event: 2007 Sep 01, 07:57 - 2007 Sep 01, 08:03 UT * midpoint of event [JD]: 2454344.83364583 * magnitude of target star: 11.3 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 2.0 * Moon: 81 % sunlit, 88° distance * Sun: 43° distance * rough path description: Venezuela The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 1.07 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .037", 359° ) * approx speed of asteroid's shadow [km/s]: 40.4330 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 33383658 by 667 Denise on 2007 Sep 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 - 72 0 0 0 42 20 7 57 51 1 85 -42 0 20 4 1 4 35 - 0 27 41 1 52 9 - 71 0 0 0 47 5 7 57 51 2 85 -41 0 24 49 1 9 20 - 0 22 54 1 56 53 - 70 0 0 0 51 41 7 57 51 3 85 -40 0 29 25 1 13 55 - 0 18 18 2 1 27 - 69 0 0 0 56 6 7 57 51 4 85 -39 0 33 50 1 18 20 - 0 13 52 2 5 52 - 68 0 0 1 0 21 7 57 51 5 85 -38 0 38 6 1 22 35 - 0 9 36 2 10 7 - 67 0 0 1 4 27 7 57 52 6 85 -37 0 42 12 1 26 41 - 0 5 30 2 14 11 - 66 0 0 1 8 22 7 57 52 7 85 -36 0 46 7 1 30 35 - 0 1 34 2 18 6 - 65 0 0 1 12 7 7 57 52 8 85 -35 0 49 52 1 34 20 0 2 12 2 21 50 - 64 0 0 1 15 41 7 57 53 9 85 -34 0 53 27 1 37 55 0 5 47 2 25 24 - 63 0 0 1 19 6 7 57 53 10 85 -33 0 56 52 1 41 19 0 9 12 2 28 47 - 62 0 0 1 22 20 7 57 54 11 85 -32 1 0 6 1 44 32 0 12 27 2 32 1 - 61 0 0 1 25 23 7 57 54 12 85 -31 1 3 9 1 47 36 0 15 31 2 35 3 - 60 0 0 1 28 16 7 57 55 13 86 -30 1 6 2 1 50 28 0 18 24 2 37 56 - 59 0 0 1 30 58 7 57 55 14 86 -29 1 8 45 1 53 10 0 21 7 2 40 37 - 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2007 Jan 18 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.011, 79° remarks: * orbital elements for (667) Denise : Mean anomaly = 359.41110855 deg Arg. of pericenter = 306.63399721 deg Long. of node = 153.34304730 deg Inclination = 25.40252678 deg Eccentricity = 0.19215457 Semimajor axis = 3.18251654 AU Perihelion dist = 2.57098146 AU Mag: H = 9.27, G = 0.15 Epoch of elements : MJD 54344.33400000 TDT (2007 Sep 01.334) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 01 667 Denise 8h 0.4m UT 11.3 7 46 34.101 4 43 30.512UCAC 33383658 0.0 14.3 81 2.0 3.212 4.133 -9.42 16.420 4.728 59.93 8.37 8.0075 -.02099 -.13825 22.56072 -3.44015 -0.00374 -0.00049 2000 358.6587292007 828.00000306.633997153.343047 25.4025270.192154573.182516542.570981468.9 5 0.15 RATE 1.7359939 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.038 0.037 359.1 2.070 0.037 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 05, 22:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org