IOTA/IOTA-ES occultation update for (3915) Fukushima / HIP 41345 event on 2012 Dec 16, 04:34 UT Visible from Europe, S USA, Mexico Summary ------- On 2012 Dec 16 UT, the 23 km diameter asteroid (3915) Fukushima will occult a 8.5 mag star in the constellation Hydra for observers along a path across Europe, S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.8 mag to 16.3 mag (the magnitude of the asteroid) for at most 4.3 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: . The event at a glimpse ---------------------- * Rank: 24 * date and approx. time of event: 2012 Dec 16, 04:20 - 2012 Dec 16, 04:47 UT * geocentric midpoint of event [JD]: 2456277.689975 * magnitude of target star: 8.5 * magnitude drop [mag]: 7.8 * estimated maximum duration [s]: 4.3 * Moon: 11 % sunlit, 165° distance * Sun: 133° distance * rough path description: Europe, S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 2.76 * 1 sigma uncertainty interval [seconds]: +/- 15.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .048", 88° ) * approx speed of asteroid's shadow [km/s]: 5.2562 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 41345 by 3915 Fukushima on 2012 Dec 16 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 -120 0 0 30 23 35 4 47 3 0 90 -48 30 32 55 30 14 17 31 24 57 .. .. .. -119 0 0 30 24 9 4 47 2 1 90 -48 30 33 29 30 14 51 31 25 30 .. .. .. -118 0 0 30 25 8 4 47 2 2 91 -49 30 34 27 30 15 50 31 26 28 .. .. .. -117 0 0 30 26 31 4 47 1 3 91 -50 30 35 50 30 17 13 31 27 50 .. .. .. -116 0 0 30 28 18 4 46 59 4 92 -51 30 37 38 30 19 1 31 29 37 .. .. .. -115 0 0 30 30 30 4 46 57 5 93 -52 30 39 49 30 21 12 31 31 48 .. .. .. -114 0 0 30 33 6 4 46 55 5 93 -53 30 42 25 30 23 48 31 34 23 .. .. .. -113 0 0 30 36 5 4 46 52 6 94 -54 30 45 25 30 26 48 31 37 23 29 35 59 -112 0 0 30 39 28 4 46 49 7 94 -54 30 48 48 30 30 11 31 40 47 29 39 21 -111 0 0 30 43 15 4 46 45 8 95 -55 30 52 34 30 33 57 31 44 34 29 43 8 -110 0 0 30 47 25 4 46 41 9 95 -56 30 56 45 30 38 7 31 48 45 29 47 17 -109 0 0 30 51 58 4 46 37 10 96 -57 31 1 18 30 42 40 31 53 19 29 51 49 -108 0 0 30 56 54 4 46 32 11 96 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66 8 21 65 49 46 67 0 15 .. .. .. 64 0 0 65 59 31 4 20 4 1 268 -7 66 8 49 65 50 14 67 0 42 .. .. .. 65 0 0 65 59 47 4 20 3 1 269 -7 66 9 5 65 50 31 67 0 57 .. .. .. 66 0 0 65 59 52 4 20 3 0 270 -6 66 9 10 65 50 35 67 1 1 .. .. .. Uncertainty in time = +/- 16 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 41345 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 26 07.0695 DE: +00 13 47.764 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .024, .020 ) * V mag [mag]: 8.5 * B mag [mag]: 8.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3915) Fukushima approx. diameter [km]: 23 approx. diameter ["]: .018 distance from Earth [AU]: 1.75500 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 905 number of rejected observations: 38 time covered by the observations: 1950 Aug 21 - 2012 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.061, 0.044, 88° remarks: * orbital elements for (3915) Fukushima : Mean anomaly = 151.19206370 deg Arg. of pericenter = 144.97719254 deg Long. of node = 173.52292654 deg Inclination = 14.43126085 deg Eccentricity = 0.04118364 Semimajor axis = 2.43865024 AU Perihelion dist = 2.33821774 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 56277.19000000 TDT (2012 Dec 16.190) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 16 3915 Fukushima 4h 33.6m UT 8.5 8 26 7.070 0 13 47.76HIP 41345 8.6 16.3 23 4.3 1.755 -0.945 -4.52 -27.0897 0.232 110.53 -23.33 4.5594 -0.22815 0.70613 -2.82548 -0.90460 -0.00364 0.00231 2000 149.331225201212 9.00000144.977193173.522927 14.4312610.04118364 2.4386502 2.338217712.2 5.00.15 RATE 2.5880930 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.048 88 3.76 0.050 0 0-5 4 056264.0020121216__41345 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 05:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org