IOTA/IOTA-ES occultation update for (1310) Villigera / TYC 0006-00086-1 event on 2012 Sep 15, 04:16 UT Visible from Africa, USA Summary ------- On 2012 Sep 15 UT, the 17 km diameter asteroid (1310) Villigera will occult a 11.3 mag star in the constellation Pisces for observers along a path across Africa, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 13.6 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: 30 * date and approx. time of event: 2012 Sep 15, 04:07 - 2012 Sep 15, 04:25 UT * geocentric midpoint of event [JD]: 2456185.6780625 * magnitude of target star: 11.3 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 1.5 * Moon: 1 % sunlit, 154° distance * Sun: 165° distance * rough path description: Africa, USA The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 2.27 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .035", 56° ) * approx speed of asteroid's shadow [km/s]: 11.4013 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0006-00086-1 by 1310 Villigera on 2012 Sep 15 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 -148 0 0 37 24 44 4 25 19 0 84 -6 37 29 33 37 19 54 37 51 30 36 58 1 -147 0 0 37 29 37 4 25 19 1 85 -7 37 34 26 37 24 47 37 56 22 37 2 55 -146 0 0 37 34 11 4 25 19 2 85 -7 37 39 1 37 29 22 38 0 56 37 7 30 -145 0 0 37 38 27 4 25 19 3 86 -8 37 43 16 37 33 38 38 5 11 37 11 47 -144 0 0 37 42 24 4 25 18 4 87 -9 37 47 13 37 37 35 38 9 7 37 15 44 -143 0 0 37 46 2 4 25 18 4 87 -10 37 50 51 37 41 13 38 12 44 37 19 23 -142 0 0 37 49 21 4 25 17 5 88 -10 37 54 10 37 44 32 38 16 3 37 22 43 -141 0 0 37 52 22 4 25 16 6 88 -11 37 57 10 37 47 33 38 19 3 37 25 44 -140 0 0 37 55 4 4 25 15 7 89 -12 37 59 52 37 50 15 38 21 44 37 28 27 -139 0 0 37 57 27 4 25 14 8 90 -13 38 2 16 37 52 39 38 24 7 37 30 50 -138 0 0 37 59 32 4 25 13 8 90 -13 38 4 20 37 54 43 38 26 12 37 32 56 -137 0 0 38 1 18 4 25 12 9 91 -14 38 6 7 37 56 30 38 27 58 37 34 42 -136 0 0 38 2 46 4 25 11 10 91 -15 38 7 34 37 57 58 38 29 25 37 36 10 -135 0 0 38 3 55 4 25 9 11 92 -16 38 8 44 37 59 7 38 30 34 37 37 20 -134 0 0 38 4 46 4 25 8 11 93 -16 38 9 34 37 59 58 38 31 25 37 38 10 -133 0 0 38 5 18 4 25 6 12 93 -17 38 10 7 38 0 30 38 31 57 37 38 43 -132 0 0 38 5 32 4 25 4 13 94 -18 38 10 21 38 0 44 38 32 11 37 38 57 -131 0 0 38 5 28 4 25 2 14 95 -19 38 10 16 38 0 40 38 32 7 37 38 52 -130 0 0 38 5 5 4 25 1 15 95 -19 38 9 53 38 0 17 38 31 44 37 38 29 -129 0 0 38 4 24 4 24 58 15 96 -20 38 9 12 37 59 35 38 31 3 37 37 48 -128 0 0 38 3 24 4 24 56 16 96 -21 38 8 13 37 58 36 38 30 4 37 36 48 -127 0 0 38 2 7 4 24 54 17 97 -22 38 6 55 37 57 18 38 28 47 37 35 30 -126 0 0 38 0 31 4 24 52 18 98 -22 38 5 19 37 55 42 38 27 11 37 33 53 -125 0 0 37 58 36 4 24 49 18 98 -23 38 3 25 37 53 48 38 25 18 37 31 59 -124 0 0 37 56 24 4 24 47 19 99 -24 38 1 13 37 51 35 38 23 6 37 29 46 -123 0 0 37 53 53 4 24 44 20 100 -25 37 58 42 37 49 4 38 20 35 37 27 14 -122 0 0 37 51 4 4 24 41 21 100 -25 37 55 53 37 46 15 38 17 47 37 24 25 -121 0 0 37 47 57 4 24 38 22 101 -26 37 52 46 37 43 8 38 14 41 37 21 17 -120 0 0 37 44 32 4 24 35 22 101 -27 37 49 21 37 39 42 38 11 16 37 17 51 -119 0 0 37 40 48 4 24 32 23 102 -27 37 45 38 37 35 59 38 7 34 37 14 6 -118 0 0 37 36 47 4 24 29 24 103 -28 37 41 36 37 31 57 38 3 33 37 10 4 -117 0 0 37 32 27 4 24 26 25 103 -29 37 37 17 37 27 37 37 59 15 37 5 43 -116 0 0 37 27 49 4 24 22 25 104 -30 37 32 39 37 22 59 37 54 38 37 1 4 -115 0 0 37 22 53 4 24 19 26 105 -30 37 27 44 37 18 3 37 49 43 36 56 7 -114 0 0 37 17 39 4 24 15 27 105 -31 37 22 30 37 12 49 37 44 30 36 50 52 -113 0 0 37 12 8 4 24 12 28 106 -32 37 16 58 37 7 17 37 39 0 36 45 19 -112 0 0 37 6 18 4 24 8 29 107 -32 37 11 9 37 1 27 37 33 11 36 39 28 -111 0 0 37 0 10 4 24 4 29 107 -33 37 5 1 36 55 19 37 27 4 36 33 19 -110 0 0 36 53 44 4 24 0 30 108 -34 36 58 35 36 48 52 37 20 40 36 26 52 -109 0 0 36 47 0 4 23 56 31 109 -35 36 51 52 36 42 8 37 13 57 36 20 6 -108 0 0 36 39 58 4 23 51 32 109 -35 36 44 50 36 35 6 37 6 57 36 13 3 -107 0 0 36 32 38 4 23 47 32 110 -36 36 37 31 36 27 46 36 59 39 36 5 42 -106 0 0 36 25 1 4 23 43 33 111 -37 36 29 53 36 20 9 36 52 3 35 58 3 -105 0 0 36 17 6 4 23 38 34 111 -37 36 21 58 36 12 13 36 44 9 35 50 6 -104 0 0 36 8 52 4 23 33 35 112 -38 36 13 45 36 3 59 36 35 58 35 41 51 -103 0 0 36 0 21 4 23 29 36 113 -39 36 5 15 35 55 28 36 27 28 35 33 18 -102 0 0 35 51 32 4 23 24 36 113 -39 35 56 26 35 46 39 36 18 41 35 24 28 -101 0 0 35 42 26 4 23 19 37 114 -40 35 47 20 35 37 32 36 9 36 35 15 19 -100 0 0 35 33 2 4 23 14 38 115 -41 35 37 56 35 28 8 36 0 14 35 5 53 - 99 0 0 35 23 20 4 23 9 39 116 -41 35 28 15 35 18 25 35 50 34 34 56 10 - 98 0 0 35 13 21 4 23 3 40 116 -42 35 18 16 35 8 26 35 40 36 34 46 9 - 97 0 0 35 3 4 4 22 58 40 117 -43 35 7 59 34 58 8 35 30 21 34 35 50 - 96 0 0 34 52 29 4 22 53 41 118 -44 34 57 25 34 47 34 35 19 49 34 25 13 - 95 0 0 34 41 37 4 22 47 42 119 -44 34 46 33 34 36 41 35 8 59 34 14 20 - 94 0 0 34 30 28 4 22 41 43 119 -45 34 35 24 34 25 32 34 57 51 34 3 8 - 93 0 0 34 19 1 4 22 36 44 120 -45 34 23 58 34 14 5 34 46 27 33 51 40 - 92 0 0 34 7 17 4 22 30 44 121 -46 34 12 15 34 2 21 34 34 45 33 39 54 - 91 0 0 33 55 16 4 22 24 45 122 -47 34 0 14 33 50 19 34 22 46 33 27 51 - 90 0 0 33 42 58 4 22 18 46 122 -47 33 47 56 33 38 1 34 10 30 33 15 31 - 89 0 0 33 30 23 4 22 12 47 123 -48 33 35 21 33 25 25 33 57 57 33 2 54 - 88 0 0 33 17 31 4 22 5 47 124 -49 33 22 30 33 12 33 33 45 7 32 50 0 - 87 0 0 33 4 22 4 21 59 48 125 -49 33 9 21 32 59 23 33 32 0 32 36 49 - 86 0 0 32 50 57 4 21 52 49 126 -50 32 55 56 32 45 57 33 18 36 32 23 21 - 85 0 0 32 37 14 4 21 46 50 127 -51 32 42 14 32 32 15 33 4 56 32 9 37 - 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0 12 46 16 0 0 0 0 46 4 8 18 23 275 -11 0 5 42 - 0 4 9 0 28 6 - 0 26 30 17 0 0 - 0 12 40 4 8 14 22 275 -10 - 0 7 44 - 0 17 35 0 14 38 - 0 39 54 18 0 0 - 0 25 46 4 8 10 21 275 -9 - 0 20 51 - 0 30 41 0 1 30 - 0 52 58 19 0 0 - 0 38 32 4 8 6 20 275 -8 - 0 33 38 - 0 43 27 - 0 11 18 - 1 5 43 20 0 0 - 0 50 59 4 8 3 19 276 -7 - 0 46 4 - 0 55 53 - 0 23 46 - 1 18 8 21 0 0 - 1 3 5 4 7 59 18 276 -6 - 0 58 11 - 1 7 59 - 0 35 54 - 1 30 12 22 0 0 - 1 14 51 4 7 56 17 276 -5 - 1 9 57 - 1 19 45 - 0 47 42 - 1 41 56 23 0 0 - 1 26 16 4 7 53 16 276 -4 - 1 21 23 - 1 31 10 - 0 59 8 - 1 53 20 24 0 0 - 1 37 21 4 7 50 15 276 -3 - 1 32 27 - 1 42 14 - 1 10 14 - 2 4 23 25 0 0 - 1 48 4 4 7 48 14 276 -2 - 1 43 11 - 1 52 57 - 1 20 59 - 2 15 5 26 0 0 - 1 58 26 4 7 45 13 276 -1 - 1 53 34 - 2 3 19 - 1 31 23 - 2 25 25 Uncertainty in time = +/- 4 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 0006-00086-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 23 54.5716 DE: +04 50 47.497 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .028 ) * V mag [mag]: 11.3 * B mag [mag]: 12.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1310) Villigera approx. diameter [km]: 17 approx. diameter ["]: .022 distance from Earth [AU]: 1.04700 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 599 number of rejected observations: 38 time covered by the observations: 1932 Feb 28 - 2012 Sep 01 1 sigma uncertainty ellipse (major, minor, PA): 0.050, 0.022, 45° remarks: * orbital elements for (1310) Villigera : Mean anomaly = 313.32975953 deg Arg. of pericenter = 88.67919033 deg Long. of node = 357.35362369 deg Inclination = 21.07746458 deg Eccentricity = 0.35600532 Semimajor axis = 2.39167494 AU Perihelion dist = 1.54022595 AU Mag: H = 11.41, G = 0.15 Epoch of elements : MJD 56185.17800000 TDT (2012 Sep 15.178) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 15 1310 Villigera 4h 16.4m UT 11.3 0 23 54.572 4 50 47.50TYC 0006-00086-1 12.3 13.6 17 1.5 1.047 -3.391 18.95 -52.6610 4.842 114.69 2.88 4.2735 0.10132 0.27101 -6.02728 2.25470 -0.00118 -0.00070 2000 311.9499702012 910.00000 88.679190357.353624 21.0774650.35600532 2.3916749 1.540225911.5 5.00.15 RATE 2.6647160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.056 0.035 56 3.27 0.051 0 0-4-3 056178.0020120915_0086-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org