IOTA/IOTA-ES occultation update for (1071) Brita / TYC 0858-00346-1 event on 2012 Nov 23, 05:06 UT Visible from Europe, E Canada Summary ------- On 2012 Nov 23 UT, the 63 km diameter asteroid (1071) Brita will occult a 10.3 mag star in the constellation Leo for observers along a path across Europe, E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.7 mag (the magnitude of the asteroid) for at most 2.6 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: 71 * date and approx. time of event: 2012 Nov 23, 05:02 - 2012 Nov 23, 05:06 UT * geocentric midpoint of event [JD]: 2456254.713025 * magnitude of target star: 10.3 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 2.6 * Moon: 76 % sunlit, 161° distance * Sun: 76° distance * rough path description: Europe, E Canada The occultation path -------------------- * approximate projected width [km]: 72 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .026", 101° ) * approx speed of asteroid's shadow [km/s]: 23.9761 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0858-00346-1 by 1071 Brita on 2012 Nov 23 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 - 70 0 0 46 30 20 5 2 53 1 75 -63 46 10 10 46 50 35 45 37 37 47 23 31 - 69 0 0 46 41 23 5 2 53 1 76 -62 46 21 14 47 1 35 45 48 44 47 34 28 - 68 0 0 46 52 8 5 2 53 2 77 -62 46 32 1 47 12 18 45 59 34 47 45 8 - 67 0 0 47 2 35 5 2 53 3 77 -62 46 42 30 47 22 44 46 10 7 47 55 31 - 66 0 0 47 12 45 5 2 54 3 78 -61 46 52 42 47 32 52 46 20 22 48 5 36 - 65 0 0 47 22 38 5 2 54 4 79 -61 47 2 37 47 42 43 46 30 19 48 15 24 - 64 0 0 47 32 13 5 2 54 5 80 -60 47 12 14 47 52 17 46 39 59 48 24 55 - 63 0 0 47 41 31 5 2 55 5 80 -60 47 21 34 48 1 33 46 49 22 48 34 8 - 62 0 0 47 50 32 5 2 55 6 81 -59 47 30 36 48 10 32 46 58 27 48 43 4 - 61 0 0 47 59 15 5 2 55 7 82 -59 47 39 21 48 19 14 47 7 15 48 51 43 - 60 0 0 48 7 42 5 2 56 8 83 -58 47 47 49 48 27 38 47 15 45 49 0 5 - 59 0 0 48 15 50 5 2 56 8 83 -58 47 55 59 48 35 45 47 23 58 49 8 9 - 58 0 0 48 23 42 5 2 57 9 84 -57 48 3 52 48 43 35 47 31 54 49 15 57 - 57 0 0 48 31 16 5 2 57 10 85 -57 48 11 28 48 51 8 47 39 32 49 23 27 - 56 0 0 48 38 33 5 2 58 10 86 -56 48 18 47 48 58 24 47 46 53 49 30 40 - 55 0 0 48 45 33 5 2 59 11 86 -56 48 25 48 49 5 22 47 53 57 49 37 36 - 54 0 0 48 52 16 5 2 59 12 87 -55 48 32 33 49 12 4 48 0 43 49 44 15 - 53 0 0 48 58 42 5 3 0 12 88 -55 48 39 0 49 18 28 48 7 12 49 50 37 - 52 0 0 49 4 51 5 3 1 13 89 -54 48 45 10 49 24 35 48 13 25 49 56 43 - 51 0 0 49 10 42 5 3 2 14 89 -54 48 51 3 49 30 26 48 19 19 50 2 31 - 50 0 0 49 16 17 5 3 3 14 90 -53 48 56 38 49 35 59 48 24 57 50 8 2 - 49 0 0 49 21 34 5 3 3 15 91 -52 49 1 57 49 41 15 48 30 18 50 13 17 - 48 0 0 49 26 35 5 3 4 15 92 -52 49 6 59 49 46 15 48 35 21 50 18 14 - 47 0 0 49 31 19 5 3 5 16 93 -51 49 11 44 49 50 58 48 40 8 50 22 55 - 46 0 0 49 35 46 5 3 6 17 93 -51 49 16 11 49 55 23 48 44 37 50 27 20 - 45 0 0 49 39 55 5 3 7 17 94 -50 49 20 22 49 59 32 48 48 49 50 31 27 - 44 0 0 49 43 49 5 3 8 18 95 -50 49 24 16 50 3 25 48 52 45 50 35 18 - 43 0 0 49 47 25 5 3 9 19 96 -49 49 27 53 50 7 0 48 56 23 50 38 52 - 42 0 0 49 50 44 5 3 11 19 97 -48 49 31 13 50 10 18 48 59 44 50 42 9 - 41 0 0 49 53 47 5 3 12 20 97 -48 49 34 17 50 13 20 49 2 49 50 45 10 - 40 0 0 49 56 32 5 3 13 21 98 -47 49 37 3 50 16 5 49 5 36 50 47 54 - 39 0 0 49 59 1 5 3 14 21 99 -47 49 39 33 50 18 34 49 8 7 50 50 21 - 38 0 0 50 1 14 5 3 15 22 100 -46 49 41 45 50 20 45 49 10 20 50 52 32 - 37 0 0 50 3 9 5 3 17 23 101 -45 49 43 41 50 22 40 49 12 17 50 54 26 - 36 0 0 50 4 48 5 3 18 23 102 -45 49 45 20 50 24 19 49 13 57 50 56 4 - 35 0 0 50 6 10 5 3 20 24 102 -44 49 46 43 50 25 40 49 15 20 50 57 25 - 34 0 0 50 7 15 5 3 21 24 103 -44 49 47 48 50 26 45 49 16 26 50 58 29 - 33 0 0 50 8 4 5 3 22 25 104 -43 49 48 37 50 27 34 49 17 15 50 59 17 - 32 0 0 50 8 35 5 3 24 26 105 -42 49 49 9 50 28 5 49 17 47 50 59 48 - 31 0 0 50 8 50 5 3 25 26 106 -42 49 49 24 50 28 20 49 18 2 51 0 3 - 30 0 0 50 8 49 5 3 27 27 107 -41 49 49 22 50 28 18 49 18 1 51 0 1 - 29 0 0 50 8 30 5 3 28 28 107 -41 49 49 4 50 28 0 49 17 42 50 59 43 - 28 0 0 50 7 55 5 3 30 28 108 -40 49 48 29 50 27 25 49 17 7 50 59 8 - 27 0 0 50 7 3 5 3 32 29 109 -39 49 47 37 50 26 33 49 16 14 50 58 17 - 26 0 0 50 5 54 5 3 33 29 110 -39 49 46 28 50 25 25 49 15 5 50 57 8 - 25 0 0 50 4 29 5 3 35 30 111 -38 49 45 2 50 23 59 49 13 39 50 55 44 - 24 0 0 50 2 46 5 3 37 31 112 -38 49 43 19 50 22 17 49 11 56 50 54 2 - 23 0 0 50 0 47 5 3 39 31 113 -37 49 41 19 50 20 18 49 9 55 50 52 4 - 22 0 0 49 58 31 5 3 40 32 114 -36 49 39 3 50 18 3 49 7 38 50 49 49 - 21 0 0 49 55 58 5 3 42 32 115 -36 49 36 29 50 15 30 49 5 4 50 47 17 - 20 0 0 49 53 8 5 3 44 33 116 -35 49 33 39 50 12 41 49 2 12 50 44 29 - 19 0 0 49 50 1 5 3 46 34 116 -34 49 30 31 50 9 35 48 59 4 50 41 24 - 18 0 0 49 46 38 5 3 48 34 117 -34 49 27 7 50 6 12 48 55 38 50 38 2 - 17 0 0 49 42 57 5 3 50 35 118 -33 49 23 25 50 2 32 48 51 55 50 34 23 - 16 0 0 49 38 59 5 3 52 35 119 -33 49 19 27 49 58 35 48 47 55 50 30 28 - 15 0 0 49 34 44 5 3 54 36 120 -32 49 15 11 49 54 21 48 43 38 50 26 15 - 14 0 0 49 30 12 5 3 56 37 121 -31 49 10 38 49 49 50 48 39 4 50 21 45 - 13 0 0 49 25 23 5 3 58 37 122 -31 49 5 48 49 45 1 48 34 12 50 16 59 - 12 0 0 49 20 16 5 4 0 38 123 -30 49 0 40 49 39 56 48 29 3 50 11 55 - 11 0 0 49 14 53 5 4 3 38 124 -29 48 55 15 49 34 33 48 23 36 50 6 35 - 10 0 0 49 9 12 5 4 5 39 125 -29 48 49 33 49 28 54 48 17 52 50 0 57 - 9 0 0 49 3 13 5 4 7 40 126 -28 48 43 34 49 22 57 48 11 51 49 55 2 - 8 0 0 48 56 58 5 4 9 40 127 -27 48 37 17 49 16 42 48 5 32 49 48 49 - 7 0 0 48 50 24 5 4 12 41 128 -27 48 30 42 49 10 10 47 58 55 49 42 20 - 6 0 0 48 43 34 5 4 14 41 129 -26 48 23 50 49 3 21 47 52 1 49 35 33 - 5 0 0 48 36 26 5 4 16 42 130 -25 48 16 41 48 56 14 47 44 49 49 28 28 - 4 0 0 48 29 0 5 4 19 43 131 -25 48 9 14 48 48 50 47 37 20 49 21 7 - 3 0 0 48 21 17 5 4 21 43 132 -24 48 1 29 48 41 9 47 29 32 49 13 27 - 2 0 0 48 13 16 5 4 24 44 134 -23 47 53 26 48 33 9 47 21 27 49 5 31 - 1 0 0 48 4 57 5 4 26 44 135 -23 47 45 6 48 24 52 47 13 4 48 57 16 0 0 0 47 56 21 5 4 29 45 136 -22 47 36 28 48 16 17 47 4 24 48 48 44 1 0 0 47 47 27 5 4 32 46 137 -21 47 27 32 48 7 25 46 55 25 48 39 55 2 0 0 47 38 15 5 4 34 46 138 -20 47 18 18 47 58 15 46 46 9 48 30 47 3 0 0 47 28 45 5 4 37 47 139 -20 47 8 47 47 48 46 46 36 34 48 21 22 4 0 0 47 18 57 5 4 40 47 140 -19 46 58 57 47 39 0 46 26 42 48 11 39 5 0 0 47 8 51 5 4 42 48 142 -18 46 48 49 47 28 57 46 16 31 48 1 38 6 0 0 46 58 27 5 4 45 48 143 -18 46 38 24 47 18 35 46 6 2 47 51 19 7 0 0 46 47 45 5 4 48 49 144 -17 46 27 40 47 7 55 45 55 16 47 40 43 8 0 0 46 36 46 5 4 51 49 145 -16 46 16 38 46 56 57 45 44 11 47 29 48 9 0 0 46 25 28 5 4 54 50 147 -16 46 5 18 46 45 41 45 32 48 47 18 36 10 0 0 46 13 52 5 4 57 51 148 -15 45 53 41 46 34 7 45 21 7 47 7 5 11 0 0 46 1 58 5 5 0 51 149 -14 45 41 44 46 22 15 45 9 7 46 55 16 12 0 0 45 49 46 5 5 3 52 151 -13 45 29 30 46 10 5 44 56 50 46 43 10 13 0 0 45 37 15 5 5 6 52 152 -13 45 16 58 45 57 37 44 44 14 46 30 45 14 0 0 45 24 27 5 5 9 53 154 -12 45 4 8 45 44 51 44 31 21 46 18 2 15 0 0 45 11 21 5 5 12 53 155 -11 44 50 59 45 31 46 44 18 9 46 5 1 16 0 0 44 57 56 5 5 16 54 157 -10 44 37 32 45 18 24 44 4 39 45 51 42 17 0 0 44 44 13 5 5 19 54 158 -10 44 23 48 45 4 43 43 50 51 45 38 5 18 0 0 44 30 13 5 5 22 55 160 -9 44 9 45 44 50 45 43 36 44 45 24 10 19 0 0 44 15 54 5 5 25 55 161 -8 43 55 24 44 36 28 43 22 20 45 9 57 20 0 0 44 1 18 5 5 29 56 163 -7 43 40 45 44 21 54 43 7 38 44 55 26 21 0 0 43 46 23 5 5 32 56 164 -7 43 25 49 44 7 2 42 52 38 44 40 37 22 0 0 43 31 11 5 5 36 56 166 -6 43 10 34 43 51 51 42 37 20 44 25 31 23 0 0 43 15 41 5 5 39 57 168 -5 42 55 2 43 36 23 42 21 45 44 10 6 24 0 0 42 59 53 5 5 43 57 169 -4 42 39 12 43 20 38 42 5 52 43 54 24 25 0 0 42 43 48 5 5 46 58 171 -3 42 23 5 43 4 34 41 49 41 43 38 24 26 0 0 42 27 25 5 5 50 58 173 -3 42 6 40 42 48 14 41 33 13 43 22 7 27 0 0 42 10 44 5 5 53 58 175 -2 41 49 58 42 31 36 41 16 27 43 5 32 28 0 0 41 53 47 5 5 57 59 177 -1 41 32 58 42 14 40 40 59 24 42 48 40 29 0 0 41 36 32 5 6 1 59 179 0 41 15 42 41 57 28 40 42 5 42 31 31 Uncertainty in time = +/- 3 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0858-00346-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 14 16.8610 DE: +10 36 41.536 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 10.3 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1071) Brita approx. diameter [km]: 63 approx. diameter ["]: .032 distance from Earth [AU]: 2.70400 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1146 number of rejected observations: 94 time covered by the observations: 1910 Mar 09 - 2012 Apr 01 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.010, 116° remarks: * orbital elements for (1071) Brita : Mean anomaly = 53.64312385 deg Arg. of pericenter = 26.77229614 deg Long. of node = 52.58614804 deg Inclination = 5.37280882 deg Eccentricity = 0.11014128 Semimajor axis = 2.80015416 AU Perihelion dist = 2.49174161 AU Mag: H = 10.32, G = 0.15 Epoch of elements : MJD 56254.21300000 TDT (2012 Nov 23.213) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 23 1071 Brita 5h 6.8m UT 10.3 11 14 16.861 10 36 41.54TYC 0858-00346-1 10.7 15.7 63 2.6 2.704 2.836 -13.74 29.3016 10.616 99.93 -20.42 5.1126 0.15110 0.45998 12.85607 -4.22580 -0.00517 0.00234 2000 52.75694320121119.00000 26.772296 52.586148 5.3728090.11014128 2.8001542 2.491741610.4 5.00.15 RATE 2.1034450 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.026 101 1.81 0.026 0 0 0-4 056247.0020121123_0346-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 03:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org