IOTA/IOTA-ES occultation update for (602) Marianna / TYC 5231-00542-1 event on 2012 Sep 23, 03:14 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2012 Sep 23 UT, the 130 km diameter asteroid (602) Marianna will occult a 11.2 mag star in the constellation Aquarius for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 11.8 mag (the magnitude of the asteroid) for at most 16.2 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: 99 * date and approx. time of event: 2012 Sep 23, 03:01 - 2012 Sep 23, 03:25 UT * geocentric midpoint of event [JD]: 2456193.63497083 * magnitude of target star: 11.2 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 16.2 * Moon: 54 % sunlit, 58° distance * Sun: 152° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 131 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .035", 76° ) * approx speed of asteroid's shadow [km/s]: 8.0215 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5231-00542-1 by 602 Marianna on 2012 Sep 23 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 -143 0 0 0 45 23 3 25 58 27 96 0 1 21 33 0 9 10 1 44 40 - 0 14 3 -142 0 0 0 34 15 3 25 51 28 96 -1 1 10 26 - 0 1 59 1 33 34 - 0 25 12 -141 0 0 0 22 58 3 25 45 29 96 -2 0 59 10 - 0 13 17 1 22 19 - 0 36 31 -140 0 0 0 11 32 3 25 38 30 96 -3 0 47 45 - 0 24 44 1 10 54 - 0 47 59 -139 0 0 - 0 0 3 3 25 31 31 96 -4 0 36 11 - 0 36 20 0 59 21 - 0 59 35 -138 0 0 - 0 11 47 3 25 23 32 96 -5 0 24 28 - 0 48 5 0 47 38 - 1 11 21 -137 0 0 - 0 23 39 3 25 16 33 96 -6 0 12 37 - 0 59 58 0 35 48 - 1 23 14 -136 0 0 - 0 35 39 3 25 8 34 96 -7 0 0 38 - 1 11 59 0 23 49 - 1 35 16 -135 0 0 - 0 47 47 3 25 0 35 96 -8 - 0 11 30 - 1 24 8 0 11 42 - 1 47 26 -134 0 0 - 1 0 3 3 24 52 36 96 -9 - 0 23 45 - 1 36 25 - 0 0 32 - 1 59 43 -133 0 0 - 1 12 27 3 24 44 37 96 -10 - 0 36 7 - 1 48 50 - 0 12 54 - 2 12 8 -132 0 0 - 1 24 58 3 24 35 38 96 -11 - 0 48 37 - 2 1 21 - 0 25 23 - 2 24 41 -131 0 0 - 1 37 35 3 24 27 39 95 -12 - 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2012 Aug 28 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.016, 53° remarks: * orbital elements for (602) Marianna : Mean anomaly = 340.04271521 deg Arg. of pericenter = 46.16267094 deg Long. of node = 331.59859555 deg Inclination = 15.07664724 deg Eccentricity = 0.24544831 Semimajor axis = 3.08927075 AU Perihelion dist = 2.33101445 AU Mag: H = 8.41, G = 0.15 Epoch of elements : MJD 56193.13500000 TDT (2012 Sep 23.135) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 23 602 Marianna 3h 14.4m UT 11.2 22 12 10.793- 5 17 11.32TYC 5231-00542-1 12.3 11.8 130 16.2 1.475 -1.760 6.06 -77.9236 -5.288 129.50 -0.20 3.2393 -0.03238 -0.14142 -4.41190 1.01685 0.00257 0.00048 2000 339.4736562012 920.00000 46.162671331.598596 15.0766470.24544831 3.0892708 2.3310145 8.3 5.00.15 RATE 1.8151810 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.035 76 1.32 0.039 0 0-3-5 056178.0020120923_0542-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 23:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org