IOTA/IOTA-ES occultation update for (893) Leopoldina / TYC 0270-00080-1 event on 2012 Oct 28, 10:10 UT Visible from E Canada Summary ------- On 2012 Oct 28 UT, the 76 km diameter asteroid (893) Leopoldina will occult a 7.6 mag star in the constellation Leo for observers along a path across E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.3 mag to 15.9 mag (the magnitude of the asteroid) for at most 2.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 64 * date and approx. time of event: 2012 Oct 28, 10:07 - 2012 Oct 28, 10:08 UT * geocentric midpoint of event [JD]: 2456228.92389167 * magnitude of target star: 7.6 * magnitude drop [mag]: 8.3 * estimated maximum duration [s]: 2.2 * Moon: 98 % sunlit, 148° distance * Sun: 47° distance * rough path description: E Canada The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.94 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .024", 91° ) * approx speed of asteroid's shadow [km/s]: 34.4056 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0270-00080-1 by 893 Leopoldina on 2012 Oct 28 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 -117 0 0 50 54 19 10 7 56 0 79 -41 50 28 9 51 20 38 .. .. .. 52 10 31 -116 0 0 51 1 45 10 7 56 1 80 -40 50 35 37 51 28 2 .. .. .. 52 17 52 -115 0 0 51 8 58 10 7 56 2 81 -40 50 42 52 51 35 14 .. .. .. 52 25 1 -114 0 0 51 15 58 10 7 57 2 81 -39 50 49 53 51 42 12 .. .. .. 52 31 56 -113 0 0 51 22 45 10 7 57 3 82 -39 50 56 42 51 48 57 .. .. .. 52 38 38 -112 0 0 51 29 18 10 7 57 3 83 -38 51 3 17 51 55 29 .. .. .. 52 45 7 -111 0 0 51 35 39 10 7 57 4 84 -37 51 9 39 52 1 48 50 21 9 52 51 23 -110 0 0 51 41 46 10 7 57 5 84 -37 51 15 47 52 7 54 50 27 20 52 57 26 -109 0 0 51 47 40 10 7 57 5 85 -36 51 21 43 52 13 46 50 33 18 53 3 16 -108 0 0 51 53 21 10 7 58 6 86 -36 51 27 25 52 19 26 50 39 3 53 8 53 -107 0 0 51 58 49 10 7 58 7 87 -35 51 32 54 52 24 52 50 44 34 53 14 17 -106 0 0 52 4 3 10 7 58 7 88 -34 51 38 10 52 30 5 50 49 52 53 19 27 -105 0 0 52 9 4 10 7 59 8 88 -34 51 43 12 52 35 5 50 54 57 53 24 25 -104 0 0 52 13 52 10 7 59 8 89 -33 51 48 1 52 39 52 50 59 49 53 29 9 -103 0 0 52 18 27 10 7 59 9 90 -33 51 52 38 52 44 26 51 4 27 53 33 41 -102 0 0 52 22 49 10 8 0 10 91 -32 51 57 0 52 48 47 51 8 52 53 38 0 -101 0 0 52 26 58 10 8 0 10 92 -31 52 1 10 52 52 54 51 13 3 53 42 5 -100 0 0 52 30 53 10 8 1 11 92 -31 52 5 7 52 56 49 51 17 2 53 45 57 - 99 0 0 52 34 36 10 8 1 11 93 -30 52 8 50 53 0 30 51 20 47 53 49 37 - 98 0 0 52 38 5 10 8 2 12 94 -30 52 12 20 53 3 58 51 24 19 53 53 3 - 97 0 0 52 41 21 10 8 2 13 95 -29 52 15 37 53 7 13 51 27 37 53 56 17 - 96 0 0 52 44 24 10 8 3 13 96 -29 52 18 40 53 10 15 51 30 42 53 59 17 - 95 0 0 52 47 13 10 8 3 14 96 -28 52 21 31 53 13 4 51 33 34 54 2 5 - 94 0 0 52 49 50 10 8 4 14 97 -27 52 24 8 53 15 40 51 36 13 54 4 39 - 93 0 0 52 52 13 10 8 4 15 98 -27 52 26 32 53 18 3 51 38 38 54 7 1 - 92 0 0 52 54 24 10 8 5 16 99 -26 52 28 43 53 20 13 51 40 50 54 9 9 - 91 0 0 52 56 21 10 8 6 16 100 -26 52 30 41 53 22 9 51 42 49 54 11 5 - 90 0 0 52 58 5 10 8 7 17 101 -25 52 32 25 53 23 53 51 44 34 54 12 47 - 89 0 0 52 59 36 10 8 7 17 101 -24 52 33 57 53 25 23 51 46 6 54 14 17 - 88 0 0 53 0 53 10 8 8 18 102 -24 52 35 15 53 26 41 51 47 25 54 15 34 - 87 0 0 53 1 58 10 8 9 19 103 -23 52 36 20 53 27 45 51 48 31 54 16 37 - 86 0 0 53 2 50 10 8 10 19 104 -23 52 37 12 53 28 36 51 49 23 54 17 28 - 85 0 0 53 3 28 10 8 10 20 105 -22 52 37 50 53 29 14 51 50 2 54 18 6 - 84 0 0 53 3 53 10 8 11 20 106 -21 52 38 16 53 29 40 51 50 28 54 18 31 - 83 0 0 53 4 6 10 8 12 21 107 -21 52 38 28 53 29 52 51 50 40 54 18 42 - 82 0 0 53 4 5 10 8 13 22 107 -20 52 38 27 53 29 51 51 50 39 54 18 41 - 81 0 0 53 3 50 10 8 14 22 108 -20 52 38 13 53 29 37 51 50 25 54 18 27 - 80 0 0 53 3 23 10 8 15 23 109 -19 52 37 46 53 29 9 51 49 57 54 18 0 - 79 0 0 53 2 43 10 8 16 23 110 -18 52 37 5 53 28 29 51 49 17 54 17 20 - 78 0 0 53 1 49 10 8 17 24 111 -18 52 36 11 53 27 36 51 48 23 54 16 27 - 77 0 0 53 0 43 10 8 18 24 112 -17 52 35 4 53 26 29 51 47 15 54 15 21 - 76 0 0 52 59 23 10 8 19 25 113 -16 52 33 44 53 25 10 51 45 54 54 14 2 - 75 0 0 52 57 50 10 8 20 26 114 -16 52 32 11 53 23 37 51 44 20 54 12 31 - 74 0 0 52 56 3 10 8 21 26 115 -15 52 30 24 53 21 51 51 42 33 54 10 46 - 73 0 0 52 54 4 10 8 22 27 115 -15 52 28 24 53 19 52 51 40 32 54 8 48 - 72 0 0 52 51 51 10 8 23 27 116 -14 52 26 11 53 17 40 51 38 18 54 6 36 - 71 0 0 52 49 25 10 8 24 28 117 -13 52 23 45 53 15 15 51 35 51 54 4 12 - 70 0 0 52 46 46 10 8 25 28 118 -13 52 21 5 53 12 37 51 33 10 54 1 35 - 69 0 0 52 43 54 10 8 27 29 119 -12 52 18 12 53 9 45 51 30 15 53 58 45 - 68 0 0 52 40 49 10 8 28 29 120 -12 52 15 6 53 6 40 51 27 8 53 55 42 - 67 0 0 52 37 30 10 8 29 30 121 -11 52 11 46 53 3 22 51 23 47 53 52 25 - 66 0 0 52 33 58 10 8 30 31 122 -10 52 8 13 52 59 51 51 20 12 53 48 56 - 65 0 0 52 30 12 10 8 32 31 123 -10 52 4 27 52 56 7 51 16 24 53 45 13 - 64 0 0 52 26 14 10 8 33 32 124 -9 52 0 27 52 52 9 51 12 23 53 41 17 - 63 0 0 52 22 2 10 8 34 32 125 -9 51 56 14 52 47 58 51 8 8 53 37 8 - 62 0 0 52 17 36 10 8 36 33 126 -8 51 51 48 52 43 34 51 3 40 53 32 46 - 61 0 0 52 12 58 10 8 37 33 127 -7 51 47 8 52 38 56 50 58 58 53 28 11 - 60 0 0 52 8 6 10 8 38 34 128 -7 51 42 15 52 34 5 50 54 3 53 23 22 - 59 0 0 52 3 0 10 8 40 34 129 -6 51 37 8 52 29 1 50 48 54 53 18 20 - 58 0 0 51 57 42 10 8 41 35 130 -5 51 31 49 52 23 44 50 43 32 53 13 5 - 57 0 0 51 52 10 10 8 43 35 131 -5 51 26 15 52 18 13 50 37 56 53 7 37 - 56 0 0 51 46 24 10 8 44 36 132 -4 51 20 28 52 12 29 50 32 7 53 1 56 - 55 0 0 51 40 25 10 8 46 36 133 -4 51 14 28 52 6 31 50 26 4 52 56 1 - 54 0 0 51 34 13 10 8 47 37 134 -3 51 8 14 52 0 21 50 19 48 52 49 53 - 53 0 0 51 27 47 10 8 49 38 135 -2 51 1 47 51 53 56 50 13 18 52 43 31 - 52 0 0 51 21 8 10 8 50 38 136 -2 50 55 7 51 47 19 50 6 35 52 36 57 - 51 0 0 51 14 16 10 8 52 39 137 -1 50 48 13 51 40 28 49 59 38 52 30 9 - 50 0 0 51 7 10 10 8 54 39 138 0 50 41 5 51 33 23 49 52 27 52 23 7 Uncertainty in time = +/- 2 secs Prediction of 2012 Sep 3.0 Data for the target star ------------------------ * name: TYC 0270-00080-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 21 39.5362 DE: +07 13 22.337 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 7.6 * B mag [mag]: 8.8 * Apparent position with proper motion RA(deg): 170.5800853603 DE(deg): 7.1521315945 * Equation of equinoxes (radians) : 0.000058296432485 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (893) Leopoldina approx. diameter [km]: 76 approx. diameter ["]: .026 distance from Earth [AU]: 4.01700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1090 number of rejected observations: 59 time covered by the observations: 1918 May 31 - 2012 May 08 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 96° remarks: * orbital elements for (893) Leopoldina : Mean anomaly = 138.13075138 deg Arg. of pericenter = 223.31809207 deg Long. of node = 145.07496235 deg Inclination = 17.02278116 deg Eccentricity = 0.15076389 Semimajor axis = 3.04802394 AU Perihelion dist = 2.58849200 AU Mag: H = 9.55, G = 0.15 Epoch of elements : MJD 56228.42400000 TDT (2012 Oct 28.424) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 28 893 Leopoldina 10h 10.4m UT 7.6 11 21 39.536 7 13 22.34TYC 0270-00080-1 8.8 15.9 76 2.2 4.017 2.768 -10.49 -19.3482 7.226 23.35 -13.32 10.1734 0.14788 0.58120 18.81904 -4.79154 -0.00390 0.00188 2000 136.57049920121020.00000223.318092145.074962 17.0227810.15076389 3.0480239 2.5884920 9.5 5.00.15 RATE 1.8521510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.024 91 1.94 0.025 0 0 2-3 056173.0020121028_0080-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 03, 20:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org