IOTA/IOTA-ES occultation update for (3328) Interposita / TYC 1853-00315-1 event on 2012 Nov 24, 11:19 UT Visible from Mexico, W USA, Japan, China Summary ------- On 2012 Nov 24 UT, the 19 km diameter asteroid (3328) Interposita will occult a 10.2 mag star in the constellation Taurus for observers along a path across Mexico, W USA, Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.5 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: 13 * date and approx. time of event: 2012 Nov 24, 11:11 - 2012 Nov 24, 11:26 UT * geocentric midpoint of event [JD]: 2456255.97157083 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 1.5 * Moon: 85 % sunlit, 61° distance * Sun: 164° distance * rough path description: Mexico, W USA, Japan, China The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 5.04 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .085 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .087", .060", 74° ) * approx speed of asteroid's shadow [km/s]: 13.1966 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1853-00315-1 by 3328 Interposita on 2012 Nov 24 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 98 0 0 24 45 50 11 26 46 0 61 -11 24 51 58 24 39 41 25 54 9 .. .. .. 99 0 0 25 16 25 11 26 46 1 61 -12 25 22 34 25 10 17 26 24 39 .. .. .. 100 0 0 25 46 44 11 26 45 2 62 -13 25 52 52 25 40 36 26 54 53 .. .. .. 101 0 0 26 16 45 11 26 45 3 62 -14 26 22 52 26 10 38 27 24 48 .. .. .. 102 0 0 26 46 28 11 26 44 4 63 -15 26 52 35 26 40 21 27 54 25 .. .. .. 103 0 0 27 15 51 11 26 43 5 63 -16 27 21 58 27 9 45 28 23 43 26 8 27 104 0 0 27 44 56 11 26 42 6 63 -17 27 51 2 27 38 50 28 52 41 26 37 37 105 0 0 28 13 40 11 26 41 7 64 -18 28 19 45 28 7 35 29 21 18 27 6 28 106 0 0 28 42 4 11 26 40 8 64 -19 28 48 8 28 36 0 29 49 35 27 34 59 107 0 0 29 10 7 11 26 39 9 65 -20 29 16 11 29 4 3 30 17 31 28 3 9 108 0 0 29 37 48 11 26 37 10 65 -21 29 43 52 29 31 45 30 45 5 28 30 58 109 0 0 30 5 8 11 26 36 11 66 -22 30 11 11 29 59 6 31 12 17 28 58 25 110 0 0 30 32 6 11 26 34 12 66 -23 30 38 8 30 26 4 31 39 7 29 25 30 111 0 0 30 58 41 11 26 32 13 67 -24 31 4 42 30 52 40 32 5 34 29 52 13 112 0 0 31 24 53 11 26 30 14 67 -25 31 30 53 31 18 53 32 31 38 30 18 34 113 0 0 31 50 42 11 26 28 15 68 -25 31 56 42 31 44 43 32 57 19 30 44 31 114 0 0 32 16 8 11 26 26 16 69 -26 32 22 7 32 10 9 33 22 36 31 10 5 115 0 0 32 41 10 11 26 23 17 69 -27 32 47 8 32 35 12 33 47 29 31 35 15 116 0 0 33 5 48 11 26 21 18 70 -28 33 11 45 32 59 51 34 11 58 32 0 2 117 0 0 33 30 2 11 26 18 19 70 -29 33 35 58 33 24 6 34 36 4 32 24 25 118 0 0 33 53 52 11 26 16 20 71 -30 33 59 47 33 47 56 34 59 44 32 48 24 119 0 0 34 17 17 11 26 13 21 71 -31 34 23 12 34 11 22 35 23 1 33 11 58 120 0 0 34 40 18 11 26 10 22 72 -32 34 46 12 34 34 24 35 45 52 33 35 8 121 0 0 35 2 54 11 26 7 22 73 -32 35 8 47 34 57 1 36 8 19 33 57 53 122 0 0 35 25 5 11 26 4 23 73 -33 35 30 58 35 19 13 36 30 21 34 20 13 123 0 0 35 46 52 11 26 1 24 74 -34 35 52 43 35 41 0 36 51 58 34 42 9 124 0 0 36 8 13 11 25 57 25 74 -35 36 14 4 36 2 22 37 13 10 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24 35 28 22 19 34 - 95 0 0 22 56 33 11 12 55 35 287 -20 23 2 41 22 50 25 24 4 46 21 48 47 - 94 0 0 22 25 35 11 12 50 34 288 -19 22 31 44 22 19 27 23 33 52 21 17 47 - 93 0 0 21 54 26 11 12 45 33 288 -18 22 0 35 21 48 18 23 2 45 20 46 35 - 92 0 0 21 23 6 11 12 40 32 289 -17 21 29 15 21 16 57 22 31 26 20 15 13 - 91 0 0 20 51 35 11 12 35 31 289 -16 20 57 44 20 45 26 21 59 57 19 43 40 - 90 0 0 20 19 55 11 12 30 30 290 -15 20 26 4 20 13 46 21 28 18 19 11 59 - 89 0 0 19 48 5 11 12 25 29 290 -14 19 54 15 19 41 56 20 56 29 18 40 9 - 88 0 0 19 16 8 11 12 21 28 290 -13 19 22 18 19 9 59 20 24 33 18 8 11 - 87 0 0 18 44 4 11 12 17 27 291 -12 18 50 13 18 37 55 19 52 29 17 36 6 - 86 0 0 18 11 53 11 12 12 26 291 -10 18 18 3 18 5 44 19 20 18 17 3 56 - 85 0 0 17 39 37 11 12 8 25 292 -9 17 45 47 17 33 28 18 48 1 16 31 41 - 84 0 0 17 7 17 11 12 4 24 292 -8 17 13 26 17 1 8 18 15 40 15 59 21 - 83 0 0 16 34 53 11 12 1 23 292 -7 16 41 2 16 28 44 17 43 15 15 26 58 - 82 0 0 16 2 26 11 11 57 22 293 -6 16 8 35 15 56 18 17 10 46 14 54 33 - 81 0 0 15 29 58 11 11 53 20 293 -5 15 36 7 15 23 50 16 38 16 14 22 7 - 80 0 0 14 57 29 11 11 50 19 293 -4 15 3 37 14 51 20 16 5 44 13 49 40 - 79 0 0 14 25 0 11 11 47 18 294 -3 14 31 8 14 18 52 15 33 12 13 17 14 - 78 0 0 13 52 32 11 11 44 17 294 -2 13 58 40 13 46 24 15 0 41 12 44 48 - 77 0 0 13 20 5 11 11 41 16 294 -1 13 26 13 13 13 58 14 28 12 12 12 26 Uncertainty in time = +/- 10 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1853-00315-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 04 32.9446 DE: +26 25 55.819 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .033 ) * V mag [mag]: 10.2 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3328) Interposita approx. diameter [km]: 19 approx. diameter ["]: .013 distance from Earth [AU]: 2.05800 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 721 number of rejected observations: 11 time covered by the observations: 1949 Dec 22 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.084, 0.050, 73° remarks: * orbital elements for (3328) Interposita : Mean anomaly = 83.44783614 deg Arg. of pericenter = 276.65664034 deg Long. of node = 60.52336711 deg Inclination = 11.46146590 deg Eccentricity = 0.10710935 Semimajor axis = 3.02273443 AU Perihelion dist = 2.69897132 AU Mag: H = 11.40, G = 0.15 Epoch of elements : MJD 56255.47200000 TDT (2012 Nov 24.472) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 24 3328 Interposita 11h 19.1m UT 10.2 5 4 32.945 26 25 55.82TYC 1853-00315-1 10.6 15.8 19 1.5 2.058 -2.330 5.86 -157.4482 26.431 6.94 -20.68 11.3177 0.05356 0.28656 -7.32108 1.37214 -0.00149 -0.00051 2000 82.42159320121119.00000276.656640 60.523367 11.4614660.10710935 3.0227344 2.698971311.4 5.00.15 RATE 1.8754440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.087 0.060 74 6.04 0.064 0 0-4-1 056247.0020121124_0315-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org