IOTA/IOTA-ES occultation update for (1086) Nata / 2UCAC 39606062 event on 2012 Nov 01, 02:57 UT Visible from Europe, E Canada, USA, NW Mexico Summary ------- On 2012 Nov 01 UT, the 85 km diameter asteroid (1086) Nata will occult a 12.6 mag star in the constellation Pisces for observers along a path across Europe, E Canada, USA, NW Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.9 mag (the magnitude of the asteroid) for at most 6.7 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: 83 * date and approx. time of event: 2012 Nov 01, 02:50 - 2012 Nov 01, 03:04 UT * geocentric midpoint of event [JD]: 2456232.62346667 * magnitude of target star: 12.6 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 6.7 * Moon: 95 % sunlit, 37° distance * Sun: 165° distance * rough path description: Europe, E Canada, USA, NW Mexico The occultation path -------------------- * approximate projected width [km]: 100 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .034", 78° ) * approx speed of asteroid's shadow [km/s]: 12.7045 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 39606062 by 1086 Nata on 2012 Nov 1 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 -143 0 0 14 32 38 3 4 32 15 70 -1 15 3 42 14 1 46 15 43 9 13 23 7 -142 0 0 15 5 47 3 4 29 17 71 -2 15 36 59 14 34 47 16 16 35 13 55 59 -141 0 0 15 39 24 3 4 25 18 71 -3 16 10 43 15 8 16 16 50 30 14 29 19 -140 0 0 16 13 28 3 4 22 19 71 -4 16 44 55 15 42 13 17 24 51 15 3 7 -139 0 0 16 47 58 3 4 18 20 72 -5 17 19 33 16 16 35 17 59 39 15 37 20 -138 0 0 17 22 54 3 4 14 21 72 -6 17 54 37 16 51 24 18 34 53 16 11 59 -137 0 0 17 58 14 3 4 10 22 72 -7 18 30 5 17 26 36 19 10 30 16 47 2 -136 0 0 18 33 58 3 4 5 23 73 -8 19 5 56 18 2 12 19 46 31 17 22 29 -135 0 0 19 10 3 3 4 1 24 73 -9 19 42 9 18 38 11 20 22 55 17 58 18 -134 0 0 19 46 31 3 3 56 25 74 -10 20 18 44 19 14 30 20 59 39 18 34 29 -133 0 0 20 23 18 3 3 51 26 74 -11 20 55 39 19 51 10 21 36 44 19 11 0 -132 0 0 21 0 24 3 3 46 27 75 -12 21 32 52 20 28 9 22 14 7 19 47 50 -131 0 0 21 37 48 3 3 41 28 75 -13 22 10 24 21 5 26 22 51 48 20 24 58 -130 0 0 22 15 29 3 3 35 29 76 -14 22 48 12 21 43 0 23 29 45 21 2 23 -129 0 0 22 53 25 3 3 30 30 77 -15 23 26 15 22 20 49 24 7 58 21 40 4 -128 0 0 23 31 36 3 3 24 31 77 -16 24 4 32 22 58 53 24 46 24 22 17 59 -127 0 0 24 9 59 3 3 18 32 78 -17 24 43 3 23 37 9 25 25 3 22 56 8 -126 0 0 24 48 34 3 3 12 33 78 -18 25 21 44 24 15 38 26 3 53 23 34 28 -125 0 0 25 27 19 3 3 5 34 79 -19 26 0 35 24 54 16 26 42 53 24 12 59 -124 0 0 26 6 12 3 2 59 35 80 -20 26 39 36 25 33 4 27 22 2 24 51 39 -123 0 0 26 45 14 3 2 52 36 81 -21 27 18 43 26 11 59 28 1 17 25 30 26 -122 0 0 27 24 21 3 2 46 37 82 -22 27 57 57 26 51 1 28 40 38 26 9 21 -121 0 0 28 3 33 3 2 39 38 82 -23 28 37 15 27 30 7 29 20 4 26 48 21 -120 0 0 28 42 49 3 2 32 39 83 -24 29 16 36 28 9 18 29 59 32 27 27 24 -119 0 0 29 22 6 3 2 25 40 84 -25 29 55 58 28 48 30 30 39 2 28 6 30 -118 0 0 30 1 24 3 2 18 41 85 -26 30 35 22 29 27 43 31 18 31 28 45 37 -117 0 0 30 40 42 3 2 10 42 86 -27 31 14 43 30 6 55 31 57 59 29 24 44 -116 0 0 31 19 56 3 2 3 43 87 -27 31 54 3 30 46 6 32 37 25 30 3 49 -115 0 0 31 59 7 3 1 55 43 88 -28 32 33 18 31 25 13 33 16 45 30 42 51 -114 0 0 32 38 13 3 1 48 44 89 -29 33 12 28 32 4 15 33 56 1 31 21 49 -113 0 0 33 17 13 3 1 40 45 91 -30 33 51 31 32 43 11 34 35 8 32 0 40 -112 0 0 33 56 5 3 1 33 46 92 -31 34 30 26 33 21 59 35 14 8 32 39 25 -111 0 0 34 34 47 3 1 25 47 93 -31 35 9 12 34 0 39 35 52 57 33 18 1 -110 0 0 35 13 19 3 1 17 47 94 -32 35 47 46 34 39 8 36 31 35 33 56 27 -109 0 0 35 51 39 3 1 10 48 96 -33 36 26 9 35 17 26 37 10 1 34 34 42 -108 0 0 36 29 46 3 1 2 49 97 -34 37 4 18 35 55 31 37 48 12 35 12 45 -107 0 0 37 7 39 3 0 54 50 99 -34 37 42 12 36 33 22 38 26 9 35 50 34 -106 0 0 37 45 16 3 0 46 50 100 -35 38 19 50 37 10 58 39 3 49 36 28 8 -105 0 0 38 22 36 3 0 38 51 101 -36 38 57 11 37 48 17 39 41 11 37 5 27 -104 0 0 38 59 39 3 0 30 51 103 -36 39 34 14 38 25 19 40 18 15 37 42 28 -103 0 0 39 36 22 3 0 22 52 105 -37 40 10 58 39 2 3 40 54 59 38 19 11 -102 0 0 40 12 45 3 0 15 53 106 -37 40 47 21 39 38 26 41 31 22 38 55 35 -101 0 0 40 48 48 3 0 7 53 108 -38 41 23 23 40 14 29 42 7 23 39 31 38 -100 0 0 41 24 28 2 59 59 54 110 -39 41 59 2 40 50 10 42 43 1 40 7 20 - 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Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: 2UCAC 39606062 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 30 54.1660 DE: +22 19 24.966 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .028, .030 ) * V mag [mag]: 12.6 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1086) Nata approx. diameter [km]: 85 approx. diameter ["]: .054 distance from Earth [AU]: 2.16300 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1052 number of rejected observations: 66 time covered by the observations: 1900 Dec 21 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.017, 65° remarks: * orbital elements for (1086) Nata : Mean anomaly = 283.17158310 deg Arg. of pericenter = 162.28622708 deg Long. of node = 313.37069732 deg Inclination = 8.34559841 deg Eccentricity = 0.05603901 Semimajor axis = 3.16212300 AU Perihelion dist = 2.98492074 AU Mag: H = 9.46, G = 0.15 Epoch of elements : MJD 56232.12300000 TDT (2012 Nov 01.123) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 1 1086 Nata 2h 57.8m UT 12.6 1 30 54.166 22 19 24.972UCAC 39606062 0.0 13.9 85 6.7 2.163 -1.921 -11.80 -62.5298 22.327 131.45 -14.53 2.9632 -0.21389 0.48604 -6.55720 -2.90230 0.00135 -0.00075 2000 282.79946120121030.00000162.286227313.370697 8.3455980.05603901 3.1621230 2.9849208 9.3 5.00.15 RATE 1.7528140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.034 78 1.63 0.034 0 0 0-4 056226.0020121101_606062 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org