IOTA/IOTA-ES occultation update for (3396) Muazzez / TYC 7346-00412-1 event on 2007 Jul 03, 11:52 UT Visible from Australia Summary ------- On 2007 Jul 03 UT, the 38 km diameter asteroid (3396) Muazzez will occult a 11.2 mag star in the constellation Scorpius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.0 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: 18 * date and approx. time of event: 2007 Jul 03, 11:41 - 2007 Jul 03, 12:02 UT * midpoint of event [JD]: 2454284.99436667 * magnitude of target star: 11.2 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 3.7 * Moon: 91 % sunlit, 62° distance * Sun: 152° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 3.68 * 1 sigma uncertainty interval [seconds]: +/- 18.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .126 +/- .083) * 1 sigma uncertainty ellipse (major, minor, PA): ( .129", .079", 105° ) * approx speed of asteroid's shadow [km/s]: 10.4053 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7346-00412-1 by 3396 Muazzez 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 63 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 4 57 9 64 0 0 6 1 43 12 2 6 0 121 27 6 13 44 5 49 42 .. .. .. 4 21 20 65 0 0 5 25 51 12 2 6 1 121 26 5 37 53 5 13 50 7 6 27 3 45 25 66 0 0 4 49 54 12 2 5 3 121 24 5 1 56 4 37 53 6 30 32 3 9 26 67 0 0 4 13 52 12 2 5 4 121 23 4 25 54 4 1 51 5 54 32 2 33 23 68 0 0 3 37 47 12 2 4 5 121 22 3 49 49 3 25 46 5 18 28 1 57 17 69 0 0 3 1 40 12 2 2 6 121 21 3 13 42 2 49 39 4 42 21 1 21 9 70 0 0 2 25 32 12 2 1 7 121 20 2 37 34 2 13 30 4 6 12 0 45 2 71 0 0 1 49 24 12 1 59 8 121 19 2 1 26 1 37 23 3 30 3 0 8 55 72 0 0 1 13 18 12 1 57 10 121 18 1 25 19 1 1 16 2 53 55 - 0 27 10 73 0 0 0 37 13 12 1 55 11 121 16 0 49 15 0 25 12 2 17 48 - 1 3 12 74 0 0 0 1 12 12 1 53 12 121 15 0 13 13 - 0 10 48 1 41 44 - 1 39 10 75 0 0 - 0 34 44 12 1 50 13 121 14 - 0 22 43 - 0 46 44 1 5 44 - 2 15 2 76 0 0 - 1 10 35 12 1 47 14 121 13 - 0 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4 13 20 .. .. .. - 5 41 32 -112 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 5 5 54 Data for the target star ------------------------ * name: TYC 7346-00412-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 46 18.5751 DE: -30 34 25.561 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .022 ) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * Apparent position with proper motion RA(deg): 251.7042615419 DE(deg): -30.5902642022 * Equation of equinoxes (radians) : 0.000028746212976 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3396) Muazzez approx. diameter [km]: 38 approx. diameter ["]: .022 distance from Earth [AU]: 2.35100 * orbital information: orbit source: Preston date of fit: 2007 Apr 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 569 number of rejected observations: 15 time covered by the observations: 1915 Oct 15 - 2006 Aug 20 1 sigma uncertainty ellipse (major, minor, PA): 0.126, 0.076, 106° remarks: * orbital elements for (3396) Muazzez : Mean anomaly = 290.24367852 deg Arg. of pericenter = 315.56490282 deg Long. of node = 38.19560120 deg Inclination = 8.35847734 deg Eccentricity = 0.18830392 Semimajor axis = 3.38908787 AU Perihelion dist = 2.75090932 AU Mag: H = 10.86, G = 0.15 Epoch of elements : MJD 54284.49500000 TDT (2007 Jul 03.495) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 03 3396 Muazzez 11h 51.9m UT 11.2 16 46 18.575-30 34 25.56TYC 7346-00412-1 11.7 16.0 38 3.7 2.351 -1.692 2.21 152.477 -30.574 3.08 22.97 11.8648 .00218 .02425 -5.84329 0.59033 0.00261 0.00038 2000 289.5335952007 629.00000315.564903 38.195601 8.3584770.188303923.389087872.7509093211.05 0.15 RATE 1.5797190 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.129 0.079 105.3 4.680 0.081 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 05, 17:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org