IOTA/IOTA-ES occultation update for (7530) Mizusawa / TYC 6395-00553-1 event on 2012 Nov 03, 16:25 UT Visible from W Australia Summary ------- On 2012 Nov 03 UT, the 12 km diameter asteroid (7530) Mizusawa will occult a 10.5 mag star in the constellation Aquarius for observers along a path across W Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 16.0 mag (the magnitude of the asteroid) for at most 2.3 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: 17 * date and approx. time of event: 2012 Nov 03, 16:17 - 2012 Nov 03, 16:44 UT * geocentric midpoint of event [JD]: 2456235.1837 * magnitude of target star: 10.5 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 2.3 * Moon: 81 % sunlit, 110° distance * Sun: 120° distance * rough path description: W Australia The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 4.01 * 1 sigma uncertainty interval [seconds]: +/- 14.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .067 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .067", .044", 88° ) * approx speed of asteroid's shadow [km/s]: 4.9043 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6395-00553-1 by 7530 Mizusawa on 2012 Nov 3 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 35 0 0 -39 29 36 16 17 16 58 51 0 -39 33 11 -39 26 1 -40 2 0 -38 57 20 36 0 0 -39 35 9 16 17 33 59 49 -1 -39 38 44 -39 31 34 -40 7 32 -39 2 55 37 0 0 -39 40 26 16 17 51 59 47 -2 -39 44 0 -39 36 51 -40 12 46 -39 8 13 38 0 0 -39 45 25 16 18 9 60 46 -3 -39 49 0 -39 41 50 -40 17 44 -39 13 14 39 0 0 -39 50 8 16 18 27 60 44 -3 -39 53 42 -39 46 33 -40 22 26 -39 17 57 40 0 0 -39 54 33 16 18 45 61 42 -4 -39 58 7 -39 50 59 -40 26 50 -39 22 24 41 0 0 -39 58 42 16 19 3 61 40 -5 -40 2 16 -39 55 8 -40 30 57 -39 26 34 42 0 0 -40 2 34 16 19 21 62 38 -5 -40 6 8 -39 59 0 -40 34 48 -39 30 27 43 0 0 -40 6 8 16 19 39 62 36 -6 -40 9 42 -40 2 34 -40 38 22 -39 34 3 44 0 0 -40 9 26 16 19 57 63 34 -7 -40 13 0 -40 5 52 -40 41 38 -39 37 22 45 0 0 -40 12 27 16 20 16 63 32 -8 -40 16 0 -40 8 53 -40 44 38 -39 40 23 46 0 0 -40 15 10 16 20 34 63 30 -8 -40 18 44 -40 11 37 -40 47 21 -39 43 8 47 0 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Uncertainty in time = +/- 15 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 6395-00553-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 10 14.6858 DE: -16 20 52.967 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .042, .027 ) * V mag [mag]: 10.5 * B mag [mag]: 10.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7530) Mizusawa approx. diameter [km]: 12 approx. diameter ["]: .011 distance from Earth [AU]: 1.52000 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 891 number of rejected observations: 14 time covered by the observations: 1978 Aug 31 - 2012 Oct 08 1 sigma uncertainty ellipse (major, minor, PA): 0.052, 0.035, 86° remarks: * orbital elements for (7530) Mizusawa : Mean anomaly = 10.92167797 deg Arg. of pericenter = 192.38817425 deg Long. of node = 158.15663967 deg Inclination = 15.12010612 deg Eccentricity = 0.16839503 Semimajor axis = 2.62345403 AU Perihelion dist = 2.18167740 AU Mag: H = 12.30, G = 0.15 Epoch of elements : MJD 56234.68400000 TDT (2012 Nov 03.684) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 3 7530 Mizusawa 16h 24.5m UT 10.5 23 10 14.686-16 20 52.97TYC 6395-00553-1 10.9 16.0 12 2.3 1.520 1.114 0.29 58.0979 -16.349 -70.24 -15.33 16.4088 0.00742 -0.40534 2.76770 0.04787 0.00417 0.00234 2000 9.83522520121030.00000192.388174158.156640 15.1201060.16839503 2.6234540 2.181677412.3 5.00.15 RATE 2.3194980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.067 0.044 88 5.01 0.044 0 0-2 3 056226.0020121103_0553-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org