IOTA/IOTA-ES occultation update for (1071) Brita / TYC 6170-01136-1 event on 2009 Feb 08, 19:46 UT Visible from Summary ------- On 2009 Feb 08 UT, the 50 km diameter asteroid (1071) Brita will occult a 10.1 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.7 mag (the magnitude of the asteroid) for at most 3.1 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: 59 * date and approx. time of event: 2009 Feb 08, 19:41 - 2009 Feb 08, 19:46 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 3.1 * Moon: 99 % sunlit, 103° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 1.06 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .025", 100° ) * approx speed of asteroid's shadow [km/s]: 16.2157 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6170-01136-1 by 1071 Brita on 2009 Feb 8 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 79 0 0 38 27 55 19 41 9 0 111 -64 38 12 13 .. .. .. 37 39 2 .. .. .. 80 0 0 38 9 37 19 41 9 1 112 -64 37 53 53 38 25 23 37 20 39 38 58 54 81 0 0 37 50 59 19 41 9 2 112 -64 37 35 14 38 6 47 37 1 56 38 40 22 82 0 0 37 32 2 19 41 10 3 113 -64 37 16 15 37 47 51 36 42 54 38 21 30 83 0 0 37 12 45 19 41 10 3 113 -64 36 56 57 37 28 36 36 23 32 38 2 18 84 0 0 36 53 10 19 41 10 4 114 -64 36 37 19 37 9 2 36 3 51 37 42 47 85 0 0 36 33 15 19 41 11 5 115 -64 36 17 23 36 49 9 35 43 51 37 22 58 86 0 0 36 13 1 19 41 12 6 115 -63 35 57 7 36 28 56 35 23 33 37 2 49 87 0 0 35 52 28 19 41 12 7 116 -63 35 36 33 36 8 25 35 2 55 36 42 21 88 0 0 35 31 37 19 41 13 8 116 -63 35 15 41 35 47 36 34 41 59 36 21 35 89 0 0 35 10 28 19 41 14 9 117 -62 34 54 30 35 26 28 34 20 45 36 0 30 90 0 0 34 49 0 19 41 15 10 118 -62 34 33 1 35 5 2 33 59 13 35 39 7 91 0 0 34 27 15 19 41 16 11 118 -62 34 11 14 34 43 18 33 37 24 35 17 26 92 0 0 34 5 12 19 41 18 11 119 -61 33 49 10 34 21 17 33 15 16 34 55 28 93 0 0 33 42 52 19 41 19 12 119 -61 33 26 49 33 58 58 32 52 52 34 33 12 94 0 0 33 20 15 19 41 21 13 120 -60 33 4 10 33 36 22 32 30 11 34 10 39 95 0 0 32 57 22 19 41 22 14 120 -60 32 41 15 33 13 30 32 7 14 33 47 50 96 0 0 32 34 12 19 41 24 15 121 -59 32 18 4 32 50 21 31 44 0 33 24 44 97 0 0 32 10 46 19 41 26 16 122 -59 31 54 38 32 26 57 31 20 31 33 1 22 98 0 0 31 47 5 19 41 28 17 122 -58 31 30 55 32 3 17 30 56 46 32 37 44 99 0 0 31 23 9 19 41 30 18 123 -57 31 6 58 31 39 22 30 32 47 32 13 52 100 0 0 30 58 58 19 41 32 19 123 -57 30 42 46 31 15 12 30 8 33 31 49 44 101 0 0 30 34 33 19 41 34 20 124 -56 30 18 20 30 50 48 29 44 5 31 25 22 102 0 0 30 9 54 19 41 37 21 124 -55 29 53 41 30 26 10 29 19 23 31 0 46 103 0 0 29 45 2 19 41 40 22 125 -55 29 28 48 30 1 19 28 54 29 30 35 57 104 0 0 29 19 58 19 41 42 23 126 -54 29 3 42 29 36 15 28 29 21 30 10 55 105 0 0 28 54 41 19 41 45 24 126 -53 28 38 25 29 10 59 28 4 2 29 45 40 106 0 0 28 29 12 19 41 48 25 127 -52 28 12 56 28 45 31 27 38 32 29 20 14 107 0 0 28 3 33 19 41 51 26 127 -52 27 47 15 28 19 52 27 12 50 28 54 36 108 0 0 27 37 43 19 41 55 27 128 -51 27 21 25 27 54 3 26 46 58 28 28 48 109 0 0 27 11 43 19 41 58 28 128 -50 26 55 24 27 28 3 26 20 57 28 2 49 110 0 0 26 45 33 19 42 1 29 129 -49 26 29 15 27 1 54 25 54 46 27 36 41 111 0 0 26 19 16 19 42 5 29 130 -48 26 2 56 26 35 37 25 28 28 27 10 24 112 0 0 25 52 50 19 42 9 30 130 -47 25 36 30 26 9 11 25 2 1 26 43 59 113 0 0 25 26 16 19 42 13 31 131 -47 25 9 57 25 42 38 24 35 27 26 17 27 114 0 0 24 59 37 19 42 17 32 131 -46 24 43 17 25 15 58 24 8 47 25 50 47 115 0 0 24 32 51 19 42 21 33 132 -45 24 16 31 24 49 13 23 42 1 25 24 2 116 0 0 24 6 0 19 42 25 34 133 -44 23 49 40 24 22 22 23 15 10 24 57 11 117 0 0 23 39 4 19 42 30 35 133 -43 23 22 44 23 55 26 22 48 14 24 30 15 118 0 0 23 12 5 19 42 34 36 134 -42 22 55 45 23 28 26 22 21 16 24 3 15 119 0 0 22 45 2 19 42 39 37 135 -41 22 28 43 23 1 24 21 54 14 23 36 12 120 0 0 22 17 58 19 42 44 38 135 -40 22 1 39 22 34 19 21 27 10 23 9 6 121 0 0 21 50 51 19 42 49 39 136 -39 21 34 33 22 7 12 21 0 5 22 41 59 122 0 0 21 23 44 19 42 54 40 137 -38 21 7 26 21 40 5 20 33 0 22 14 50 123 0 0 20 56 38 19 42 59 41 137 -37 20 40 20 21 12 57 20 5 54 21 47 42 124 0 0 20 29 31 19 43 4 42 138 -36 20 13 14 20 45 51 19 38 50 21 20 34 125 0 0 20 2 27 19 43 9 43 139 -35 19 46 10 20 18 45 19 11 47 20 53 27 126 0 0 19 35 24 19 43 15 44 139 -34 19 19 9 19 51 42 18 44 47 20 26 22 127 0 0 19 8 25 19 43 20 45 140 -33 18 52 10 19 24 42 18 17 51 19 59 21 128 0 0 18 41 30 19 43 26 46 141 -32 18 25 16 18 57 46 17 50 58 19 32 23 129 0 0 18 14 40 19 43 32 47 142 -31 17 58 26 18 30 55 17 24 10 19 5 29 130 0 0 17 47 55 19 43 38 48 143 -30 17 31 42 18 4 9 16 57 28 18 38 41 131 0 0 17 21 16 19 43 44 49 144 -29 17 5 5 17 37 29 16 30 53 18 11 59 132 0 0 16 54 44 19 43 50 50 145 -28 16 38 34 17 10 56 16 4 24 17 45 24 133 0 0 16 28 20 19 43 56 51 146 -27 16 12 11 16 44 31 15 38 4 17 18 57 134 0 0 16 2 5 19 44 2 52 147 -26 15 45 57 16 18 15 15 11 52 16 52 37 135 0 0 15 35 59 19 44 9 53 148 -25 15 19 52 15 52 7 14 45 50 16 26 27 136 0 0 15 10 3 19 44 15 54 149 -24 14 53 58 15 26 10 14 19 58 16 0 27 137 0 0 14 44 18 19 44 22 54 150 -23 14 28 14 15 0 23 13 54 17 15 34 38 138 0 0 14 18 44 19 44 28 55 151 -22 14 2 42 14 34 48 13 28 48 15 9 0 139 0 0 13 53 23 19 44 35 56 152 -21 13 37 22 14 9 26 13 3 31 14 43 34 140 0 0 13 28 14 19 44 42 57 154 -20 13 12 15 13 44 16 12 38 27 14 18 21 141 0 0 13 3 19 19 44 48 58 155 -19 12 47 21 13 19 19 12 13 37 13 53 21 142 0 0 12 38 39 19 44 55 59 156 -18 12 22 42 12 54 37 11 49 1 13 28 36 143 0 0 12 14 13 19 45 2 59 158 -17 11 58 18 12 30 10 11 24 41 13 4 5 144 0 0 11 50 3 19 45 9 60 159 -16 11 34 10 12 5 58 11 0 36 12 39 50 145 0 0 11 26 10 19 45 16 61 161 -15 11 10 18 11 42 3 10 36 47 12 15 51 146 0 0 11 2 33 19 45 23 61 163 -13 10 46 43 11 18 25 10 13 15 11 52 9 147 0 0 10 39 13 19 45 30 62 165 -12 10 23 25 10 55 4 9 50 1 11 28 45 148 0 0 10 16 12 19 45 38 63 166 -11 10 0 25 10 32 0 9 27 5 11 5 38 149 0 0 9 53 29 19 45 45 63 168 -10 9 37 44 10 9 16 9 4 28 10 42 50 150 0 0 9 31 6 19 45 52 64 170 -9 9 15 22 9 46 51 8 42 9 10 20 21 151 0 0 9 9 2 19 45 59 64 173 -8 8 53 20 9 24 45 8 20 11 9 58 11 152 0 0 8 47 18 19 46 7 65 175 -7 8 31 38 9 2 59 7 58 33 9 36 22 153 0 0 8 25 55 19 46 14 65 177 -6 8 10 17 8 41 35 7 37 15 9 14 53 154 0 0 8 4 53 19 46 21 66 179 -5 7 49 17 8 20 31 7 16 18 8 53 46 155 0 0 7 44 13 19 46 29 66 182 -4 7 28 38 7 59 49 6 55 44 8 33 0 156 0 0 7 23 54 19 46 36 66 184 -3 7 8 22 7 39 29 6 35 31 8 12 36 157 0 0 7 3 59 19 46 43 66 187 -2 6 48 28 7 19 31 6 15 41 7 52 35 158 0 0 6 44 26 19 46 51 67 189 -1 6 28 57 6 59 57 5 56 13 7 32 57 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 6170-01136-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 18 58.0452 DE: -16 16 47.409 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .021 ) * V mag [mag]: 10.1 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1071) Brita approx. diameter [km]: 50 approx. diameter ["]: .024 distance from Earth [AU]: 2.84700 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 851 number of rejected observations: 92 time covered by the observations: 1910 Mar 09 - 2008 Jun 10 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 111° remarks: * orbital elements for (1071) Brita : Mean anomaly = 121.56325371 deg Arg. of pericenter = 27.93239339 deg Long. of node = 52.63192630 deg Inclination = 5.37119641 deg Eccentricity = 0.11201475 Semimajor axis = 2.79919682 AU Perihelion dist = 2.48564549 AU Mag: H = 10.30, G = 0.15 Epoch of elements : MJD 54870.82400000 TDT (2009 Feb 08.824) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 8 1071 Brita 19h 47.2m UT 10.1 15 18 58.045-16 16 47.41TYC 6170-01136-1 11.3 15.7 50 3.1 2.847 1.877 -8.30 153.9000 -16.277 -113.24 -14.75 19.7863 0.11618 0.37523 8.74944 -2.68655 -0.00573 0.00153 2000 121.3898412009 2 8.00000 27.932393 52.631926 5.3711960.11201475 2.7991968 2.485645510.1 5.00.15 RATE 2.1045240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.025 100 2.06 0.026 0 54776.5020090208_1136-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org