IOTA/IOTA-ES occultation update for (270) Anahita / TYC 0263-00185-1 event on 2012 Nov 19, 03:16 UT Visible from Europe Summary ------- On 2012 Nov 19 UT, the 47 km diameter asteroid (270) Anahita will occult a 10.5 mag star in the constellation Leo for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 14.0 mag (the magnitude of the asteroid) for at most 1.7 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: 47 * date and approx. time of event: 2012 Nov 19, 03:13 - 2012 Nov 19, 03:15 UT * geocentric midpoint of event [JD]: 2456250.63676667 * magnitude of target star: 10.5 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 1.7 * Moon: 34 % sunlit, 139° distance * Sun: 68° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 1.37 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .029", 0° ) * approx speed of asteroid's shadow [km/s]: 27.1393 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0263-00185-1 by 270 Anahita on 2012 Nov 19 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 - 30 0 0 52 23 34 3 13 28 0 87 -53 52 9 18 52 37 53 .. .. .. 53 17 14 - 29 0 0 52 25 40 3 13 28 1 87 -53 52 11 24 52 39 58 .. .. .. 53 19 18 - 28 0 0 52 27 27 3 13 28 1 88 -52 52 13 12 52 41 45 .. .. .. 53 21 4 - 27 0 0 52 28 56 3 13 28 2 89 -52 52 14 41 52 43 14 51 35 46 53 22 32 - 26 0 0 52 30 7 3 13 28 3 90 -51 52 15 52 52 44 24 51 36 58 53 23 41 - 25 0 0 52 30 59 3 13 28 3 90 -51 52 16 44 52 45 16 51 37 51 53 24 32 - 24 0 0 52 31 33 3 13 29 4 91 -50 52 17 18 52 45 49 51 38 25 53 25 5 - 23 0 0 52 31 48 3 13 29 4 92 -50 52 17 33 52 46 4 51 38 40 53 25 20 - 22 0 0 52 31 45 3 13 29 5 93 -50 52 17 30 52 46 1 51 38 37 53 25 17 - 21 0 0 52 31 23 3 13 29 6 94 -49 52 17 8 52 45 39 51 38 16 53 24 56 - 20 0 0 52 30 43 3 13 30 6 94 -49 52 16 28 52 44 59 51 37 35 53 24 16 - 19 0 0 52 29 44 3 13 30 7 95 -48 52 15 29 52 44 1 51 36 36 53 23 18 - 18 0 0 52 28 27 3 13 30 7 96 -48 52 14 12 52 42 44 51 35 18 53 22 2 - 17 0 0 52 26 52 3 13 31 8 97 -47 52 12 36 52 41 9 51 33 42 53 20 27 - 16 0 0 52 24 58 3 13 31 9 98 -47 52 10 42 52 39 15 51 31 46 53 18 35 - 15 0 0 52 22 45 3 13 31 9 98 -46 52 8 29 52 37 3 51 29 32 53 16 24 - 14 0 0 52 20 14 3 13 32 10 99 -46 52 5 57 52 34 33 51 26 59 53 13 54 - 13 0 0 52 17 24 3 13 32 10 100 -45 52 3 7 52 31 43 51 24 8 53 11 6 - 12 0 0 52 14 16 3 13 33 11 101 -45 51 59 58 52 28 35 51 20 57 53 8 0 - 11 0 0 52 10 48 3 13 34 12 102 -44 51 56 30 52 25 9 51 17 27 53 4 35 - 10 0 0 52 7 2 3 13 34 12 102 -44 51 52 43 52 21 23 51 13 38 53 0 52 - 9 0 0 52 2 57 3 13 35 13 103 -43 51 48 37 52 17 19 51 9 31 52 56 49 - 8 0 0 51 58 33 3 13 35 14 104 -43 51 44 13 52 12 56 51 5 4 52 52 29 - 7 0 0 51 53 50 3 13 36 14 105 -42 51 39 29 52 8 14 51 0 17 52 47 49 - 6 0 0 51 48 48 3 13 37 15 106 -42 51 34 26 52 3 12 50 55 12 52 42 50 - 5 0 0 51 43 27 3 13 38 15 106 -41 51 29 3 51 57 52 50 49 47 52 37 33 - 4 0 0 51 37 46 3 13 38 16 107 -41 51 23 22 51 52 13 50 44 3 52 31 56 - 3 0 0 51 31 47 3 13 39 17 108 -40 51 17 21 51 46 14 50 37 59 52 26 1 - 2 0 0 51 25 27 3 13 40 17 109 -40 51 11 1 51 39 56 50 31 35 52 19 46 - 1 0 0 51 18 48 3 13 41 18 110 -39 51 4 20 51 33 18 50 24 52 52 13 11 0 0 0 51 11 50 3 13 42 19 111 -39 50 57 21 51 26 21 50 17 49 52 6 18 1 0 0 51 4 32 3 13 43 19 111 -38 50 50 1 51 19 4 50 10 26 51 59 5 2 0 0 50 56 54 3 13 44 20 112 -37 50 42 22 51 11 28 50 2 42 51 51 32 3 0 0 50 48 56 3 13 45 20 113 -37 50 34 23 51 3 31 49 54 39 51 43 39 4 0 0 50 40 38 3 13 46 21 114 -36 50 26 3 50 55 15 49 46 16 51 35 27 5 0 0 50 32 0 3 13 47 22 115 -36 50 17 23 50 46 38 49 37 32 51 26 55 6 0 0 50 23 1 3 13 48 22 115 -35 50 8 23 50 37 41 49 28 28 51 18 2 7 0 0 50 13 43 3 13 49 23 116 -34 49 59 3 50 28 24 49 19 3 51 8 49 8 0 0 50 4 3 3 13 51 24 117 -34 49 49 22 50 18 46 49 9 18 50 59 16 9 0 0 49 54 3 3 13 52 24 118 -33 49 39 21 50 8 48 48 59 12 50 49 23 10 0 0 49 43 43 3 13 53 25 119 -33 49 28 58 49 58 29 48 48 44 50 39 9 11 0 0 49 33 1 3 13 54 26 120 -32 49 18 15 49 47 50 48 37 56 50 28 35 12 0 0 49 21 59 3 13 56 26 120 -31 49 7 11 49 36 49 48 26 47 50 17 39 13 0 0 49 10 36 3 13 57 27 121 -31 48 55 46 49 25 28 48 15 17 50 6 23 14 0 0 48 58 51 3 13 59 28 122 -30 48 43 59 49 13 45 48 3 25 49 54 45 15 0 0 48 46 45 3 14 0 28 123 -29 48 31 51 49 1 41 47 51 12 49 42 47 16 0 0 48 34 18 3 14 2 29 124 -29 48 19 22 48 49 16 47 38 38 49 30 27 17 0 0 48 21 29 3 14 3 30 125 -28 48 6 31 48 36 29 47 25 41 49 17 46 18 0 0 48 8 19 3 14 5 30 126 -27 47 53 19 48 23 21 47 12 23 49 4 43 19 0 0 47 54 47 3 14 7 31 127 -27 47 39 45 48 9 51 46 58 44 48 51 19 20 0 0 47 40 53 3 14 8 32 127 -26 47 25 49 47 55 59 46 44 42 48 37 33 21 0 0 47 26 37 3 14 10 32 128 -25 47 11 31 47 41 45 46 30 18 48 23 25 22 0 0 47 11 59 3 14 12 33 129 -25 46 56 51 47 27 9 46 15 33 48 8 55 23 0 0 46 56 59 3 14 14 34 130 -24 46 41 49 47 12 12 46 0 25 47 54 3 24 0 0 46 41 37 3 14 16 34 131 -23 46 26 24 46 56 52 45 44 55 47 38 50 25 0 0 46 25 53 3 14 18 35 132 -23 46 10 38 46 41 10 45 29 2 47 23 14 26 0 0 46 9 46 3 14 20 36 133 -22 45 54 29 46 25 5 45 12 48 47 7 15 27 0 0 45 53 17 3 14 22 36 134 -21 45 37 58 46 8 39 44 56 11 46 50 55 28 0 0 45 36 26 3 14 24 37 135 -20 45 21 5 45 51 50 44 39 11 46 34 12 29 0 0 45 19 12 3 14 26 38 136 -20 45 3 49 45 34 38 44 21 50 46 17 7 30 0 0 45 1 36 3 14 28 39 137 -19 44 46 11 45 17 4 44 4 5 45 59 39 31 0 0 44 43 38 3 14 30 39 138 -18 44 28 10 44 59 8 43 45 59 45 41 49 32 0 0 44 25 17 3 14 33 40 139 -17 44 9 47 44 40 50 43 27 30 45 23 37 33 0 0 44 6 34 3 14 35 41 140 -17 43 51 1 44 22 8 43 8 38 45 5 2 34 0 0 43 47 28 3 14 37 41 141 -16 43 31 54 44 3 5 42 49 25 44 46 4 35 0 0 43 28 0 3 14 40 42 142 -15 43 12 23 43 43 39 42 29 49 44 26 45 36 0 0 43 8 10 3 14 42 43 143 -14 42 52 31 43 23 51 42 9 50 44 7 2 37 0 0 42 47 57 3 14 45 44 144 -14 42 32 16 43 3 41 41 49 30 43 46 58 38 0 0 42 27 23 3 14 47 44 145 -13 42 11 40 42 43 8 41 28 48 43 26 32 39 0 0 42 6 26 3 14 50 45 146 -12 41 50 41 42 22 14 41 7 44 43 5 43 40 0 0 41 45 8 3 14 53 46 147 -11 41 29 21 42 0 58 40 46 18 42 44 32 41 0 0 41 23 28 3 14 56 46 148 -10 41 7 39 41 39 20 40 24 30 42 23 0 42 0 0 41 1 26 3 14 59 47 149 -9 40 45 35 41 17 20 40 2 21 42 1 6 43 0 0 40 39 4 3 15 1 48 150 -9 40 23 10 40 54 59 39 39 51 41 38 50 44 0 0 40 16 20 3 15 4 49 152 -8 40 0 24 40 32 17 39 17 0 41 16 14 45 0 0 39 53 15 3 15 7 49 153 -7 39 37 18 40 9 14 38 53 48 40 53 16 46 0 0 39 29 49 3 15 10 50 154 -6 39 13 50 39 45 50 38 30 16 40 29 57 47 0 0 39 6 3 3 15 14 51 155 -5 38 50 3 39 22 6 38 6 24 40 6 18 48 0 0 38 41 57 3 15 17 51 157 -4 38 25 55 38 58 2 37 42 12 39 42 19 49 0 0 38 17 32 3 15 20 52 158 -3 38 1 28 38 33 38 37 17 40 39 17 59 50 0 0 37 52 47 3 15 23 53 160 -2 37 36 42 38 8 55 36 52 50 38 53 20 51 0 0 37 27 43 3 15 27 53 161 -2 37 11 36 37 43 53 36 27 40 38 28 22 52 0 0 37 2 21 3 15 30 54 162 -1 36 46 13 37 18 32 36 2 13 38 3 5 Uncertainty in time = +/- 2 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0263-00185-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 17 46.4689 DE: +02 15 28.157 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .033 ) * V mag [mag]: 10.5 * B mag [mag]: 11.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (270) Anahita approx. diameter [km]: 47 approx. diameter ["]: .024 distance from Earth [AU]: 2.73200 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1219 number of rejected observations: 129 time covered by the observations: 1900 Sep 20 - 2012 Apr 09 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.005, 113° remarks: * orbital elements for (270) Anahita : Mean anomaly = 171.16331037 deg Arg. of pericenter = 80.31474422 deg Long. of node = 254.49343814 deg Inclination = 2.36761862 deg Eccentricity = 0.15095404 Semimajor axis = 2.19774560 AU Perihelion dist = 1.86598702 AU Mag: H = 8.76, G = 0.15 Epoch of elements : MJD 56250.13700000 TDT (2012 Nov 19.137) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 19 270 Anahita 3h 16.9m UT 10.5 11 17 46.469 2 15 28.16TYC 0263-00185-1 11.9 14.0 47 1.7 2.732 2.978 -20.95 61.6444 2.264 127.12 -19.53 3.2824 0.19278 0.41185 13.86645 -6.50907 -0.00499 0.00203 2000 171.12186620121119.00000 80.314744254.493438 2.3676190.15095404 2.1977456 1.8659870 8.8 5.00.15 RATE 3.0250880 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.029 0 2.37 0.033 0 0-1-3 056247.0020121119_0185-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 02:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org