IOTA/IOTA-ES occultation update for (464) Megaira / UCAC2 33511308 event on 2012 Nov 20, 03:38 UT Visible from Brazil, Peru Summary ------- On 2012 Nov 20 UT, the 79 km diameter asteroid (464) Megaira will occult a 11.8 mag star in the constellation Cetus for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.7 mag (the magnitude of the asteroid) for at most 8.0 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: 90 * date and approx. time of event: 2012 Nov 20, 03:28 - 2012 Nov 20, 03:48 UT * geocentric midpoint of event [JD]: 2456251.65179167 * magnitude of target star: 11.8 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 8.0 * Moon: 46 % sunlit, 88° distance * Sun: 165° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 7.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .071 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .071", .039", 86° ) * approx speed of asteroid's shadow [km/s]: 9.8924 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 33511308 by 464 Megaira on 2012 Nov 20 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 -147 0 0 - 8 52 14 3 48 52 8 84 -1 - 8 30 1 - 9 14 30 - 8 6 30 - 9 38 8 -146 0 0 - 8 47 46 3 48 51 9 83 -2 - 8 25 33 - 9 10 2 - 8 2 2 - 9 33 40 -145 0 0 - 8 43 26 3 48 49 10 83 -2 - 8 21 13 - 9 5 41 - 7 57 42 - 9 29 19 -144 0 0 - 8 39 12 3 48 47 11 83 -3 - 8 16 59 - 9 1 27 - 7 53 29 - 9 25 4 -143 0 0 - 8 35 5 3 48 44 12 83 -4 - 8 12 52 - 8 57 20 - 7 49 22 - 9 20 57 -142 0 0 - 8 31 5 3 48 42 13 83 -5 - 8 8 52 - 8 53 19 - 7 45 23 - 9 16 57 -141 0 0 - 8 27 12 3 48 39 14 83 -6 - 8 5 0 - 8 49 26 - 7 41 30 - 9 13 3 -140 0 0 - 8 23 26 3 48 36 15 82 -7 - 8 1 14 - 8 45 40 - 7 37 45 - 9 9 17 -139 0 0 - 8 19 48 3 48 33 16 82 -8 - 7 57 36 - 8 42 2 - 7 34 7 - 9 5 38 -138 0 0 - 8 16 17 3 48 30 17 82 -9 - 7 54 5 - 8 38 30 - 7 30 36 - 9 2 7 -137 0 0 - 8 12 53 3 48 27 18 82 -10 - 7 50 41 - 8 35 6 - 7 27 12 - 8 58 42 -136 0 0 - 8 9 36 3 48 23 19 82 -11 - 7 47 25 - 8 31 49 - 7 23 56 - 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2012 Oct 30 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.014, 69° remarks: * orbital elements for (464) Megaira : Mean anomaly = 34.88021168 deg Arg. of pericenter = 258.92804910 deg Long. of node = 102.39065139 deg Inclination = 10.16392339 deg Eccentricity = 0.20312492 Semimajor axis = 2.80430928 AU Perihelion dist = 2.23468419 AU Mag: H = 9.64, G = 0.15 Epoch of elements : MJD 56251.15200000 TDT (2012 Nov 20.152) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 20 464 Megaira 3h 38.6m UT 11.8 3 23 1.947 5 3 0.25UCAC2 33511308 0.0 12.7 79 8.0 1.419 -2.305 3.14 -63.4492 5.049 121.77 -19.76 3.6430 -0.02269 -0.25267 -5.56069 0.50463 0.00051 0.00146 2000 34.63843320121119.00000258.928049102.390651 10.1639230.20312492 2.8043093 2.2346842 9.5 5.00.15 RATE 2.0987720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.071 0.039 86 1.53 0.040 0 0 0 5 056247.0020121120_511308 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org