IOTA/IOTA-ES occultation update for (1342) Brabantia / TYC 8681-00542-1 event on 2008 Mar 25, 16:39 UT Visible from Papua New Guinea, E Australia, Tasmania Summary ------- On 2008 Mar 25 UT, the 18 km diameter asteroid (1342) Brabantia will occult a 11.5 mag star in the constellation Lupus for observers along a path across Papua New Guinea, E Australia, Tasmania. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.3 mag (the magnitude of the asteroid) for at most 1.9 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: 18 * date and approx. time of event: 2008 Mar 25, 16:28 - 2008 Mar 25, 16:47 UT * midpoint of event [JD]: 2454551.19405833 * magnitude of target star: 11.5 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 1.9 * Moon: 86 % sunlit, 31° distance * Sun: 119° distance * rough path description: Papua New Guinea, E Australia, Tasmania The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 3.83 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .080 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .081", .049", 94° ) * approx speed of asteroid's shadow [km/s]: 9.3908 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 8681-00542-1 by 1342 Brabantia on 2008 Mar 25 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 150 22 57 24 33 44 16 28 25 12 177 -46 150 28 22 24 32 23 150 17 33 24 35 8 151 9 37 24 23 1 149 36 0 24 46 50 150 30 41 19 2 25 16 28 42 18 177 -49 150 35 51 19 1 30 150 25 30 19 3 20 151 15 24 18 55 15 149 45 48 19 11 4 150 33 29 14 49 41 16 28 59 22 177 -50 150 38 32 14 48 58 150 28 26 14 50 24 151 17 9 14 44 0 149 49 42 14 56 32 150 33 57 11 16 14 16 29 16 26 177 -51 150 38 55 11 15 37 150 28 58 11 16 51 151 16 57 11 11 24 149 50 51 11 22 4 150 32 59 8 7 25 16 29 33 29 177 -52 150 37 55 8 6 52 150 28 4 8 7 58 151 15 34 8 3 7 149 50 20 8 12 35 150 31 4 5 15 50 16 29 50 32 177 -53 150 35 57 5 15 20 150 26 10 5 16 20 151 13 23 5 11 56 149 48 41 5 20 31 150 28 24 2 37 8 16 30 7 34 177 -53 150 33 17 2 36 41 150 23 32 2 37 36 151 10 35 2 33 32 149 46 11 2 41 29 150 25 11 0 8 32 16 30 24 37 177 -53 150 30 3 0 8 7 150 20 19 0 8 58 151 7 18 0 5 10 149 43 2 0 12 37 150 21 30 - 2 11 55 16 30 41 39 177 -53 150 26 22 - 2 12 19 150 16 37 - 2 11 30 151 3 38 - 2 15 6 149 39 19 - 2 8 3 150 17 24 - 4 25 38 16 30 58 41 176 -53 150 22 17 - 4 26 1 150 12 32 - 4 25 14 150 59 38 - 4 28 40 149 35 9 - 4 21 57 150 12 58 - 6 33 39 16 31 15 43 176 -53 150 17 52 - 6 34 2 150 8 4 - 6 33 17 150 55 20 - 6 36 35 149 30 34 - 6 30 7 150 8 13 - 8 36 50 16 31 32 45 176 -53 150 13 8 - 8 37 11 150 3 18 - 8 36 28 150 50 47 - 8 39 40 149 25 38 - 8 33 25 150 3 11 -10 35 48 16 31 49 47 176 -53 150 8 8 -10 36 9 149 58 14 -10 35 27 150 45 59 -10 38 33 149 20 22 -10 32 29 149 57 53 -12 31 6 16 32 6 49 176 -52 150 2 52 -12 31 26 149 52 55 -12 30 45 150 40 59 -12 33 46 149 14 46 -12 27 51 149 52 20 -14 23 9 16 32 23 51 176 -52 149 57 21 -14 23 29 149 47 19 -14 22 49 150 35 46 -14 25 46 149 8 54 -14 19 59 149 46 32 -16 12 20 16 32 40 53 176 -51 149 51 36 -16 12 39 149 41 29 -16 12 0 150 30 20 -16 14 54 149 2 44 -16 9 13 149 40 31 -17 58 57 16 32 57 55 175 -51 149 45 37 -17 59 16 149 35 24 -17 58 37 150 24 43 -18 1 29 148 56 17 -17 55 53 149 34 15 -19 43 16 16 33 13 56 175 -50 149 39 24 -19 43 35 149 29 5 -19 42 57 150 18 55 -19 45 47 148 49 34 -19 40 14 149 27 45 -21 25 32 16 33 30 58 175 -50 149 32 58 -21 25 50 149 22 32 -21 25 12 150 12 55 -21 28 0 148 42 35 -21 22 31 149 21 1 -23 5 55 16 33 47 60 174 -49 149 26 17 -23 6 13 149 15 44 -23 5 36 150 6 43 -23 8 22 148 35 19 -23 2 56 149 14 2 -24 44 37 16 34 4 61 174 -48 149 19 23 -24 44 55 149 8 42 -24 44 18 150 0 19 -24 47 4 148 27 46 -24 41 39 149 6 49 -26 21 47 16 34 21 63 174 -48 149 12 14 -26 22 5 149 1 24 -26 21 28 149 53 43 -26 24 13 148 19 55 -26 18 49 148 59 21 -27 57 33 16 34 38 64 173 -47 149 4 50 -27 57 52 148 53 51 -27 57 15 149 46 55 -28 0 0 148 11 47 -27 54 36 148 51 37 -29 32 4 16 34 55 66 173 -46 148 57 11 -29 32 23 148 46 2 -29 31 46 149 39 54 -29 34 31 148 3 20 -29 29 7 148 43 36 -31 5 27 16 35 12 67 172 -45 148 49 16 -31 5 45 148 37 56 -31 5 8 149 32 40 -31 7 54 147 54 34 -31 2 28 148 35 18 -32 37 46 16 35 29 69 172 -45 148 41 4 -32 38 5 148 29 33 -32 37 27 149 25 11 -32 40 14 147 45 27 -32 34 47 148 26 42 -34 9 9 16 35 46 70 171 -44 148 32 34 -34 9 28 148 20 51 -34 8 50 149 17 27 -34 11 38 147 35 58 -34 6 9 148 17 47 -35 39 41 16 36 3 72 170 -43 148 23 45 -35 40 0 148 11 49 -35 39 22 149 9 28 -35 42 11 147 26 7 -35 36 39 148 8 30 -37 9 27 16 36 20 73 169 -42 148 14 35 -37 9 46 148 2 26 -37 9 7 149 1 11 -37 11 58 147 15 51 -37 6 23 147 58 52 -38 38 31 16 36 37 75 168 -41 148 5 4 -38 38 50 147 52 40 -38 38 11 148 52 37 -38 41 4 147 5 9 -38 35 24 147 48 49 -40 6 57 16 36 54 76 166 -40 147 55 10 -40 7 17 147 42 29 -40 6 37 148 43 43 -40 9 33 146 53 58 -40 3 48 147 38 21 -41 34 51 16 37 11 77 164 -39 147 44 50 -41 35 11 147 31 53 -41 34 30 148 34 28 -41 37 29 146 42 17 -41 31 39 147 27 25 -43 2 15 16 37 28 79 162 -38 147 34 3 -43 2 35 147 20 47 -43 1 54 148 24 50 -43 4 56 146 30 3 -42 58 59 147 15 58 -44 29 13 16 37 45 80 159 -38 147 22 46 -44 29 34 147 9 11 -44 28 52 148 14 47 -44 31 57 146 17 13 -44 25 54 147 3 58 -45 55 50 16 38 2 81 155 -37 147 10 56 -45 56 11 146 57 0 -45 55 28 148 4 17 -45 58 38 146 3 43 -45 52 26 146 51 21 -47 22 8 16 38 19 82 149 -36 146 58 30 -47 22 30 146 44 12 -47 21 46 147 53 17 -47 25 0 145 49 30 -47 18 40 146 38 4 -48 48 11 16 38 36 83 141 -35 146 45 25 -48 48 33 146 30 43 -48 47 48 147 41 44 -48 51 7 145 34 29 -48 44 37 146 24 2 -50 14 2 16 38 53 84 130 -34 146 31 35 -50 14 25 146 16 28 -50 13 38 147 29 34 -50 17 3 145 18 35 -50 10 22 146 9 9 -51 39 44 16 39 10 84 114 -33 146 16 57 -51 40 7 146 1 21 -51 39 20 147 16 44 -51 42 50 145 1 41 -51 35 58 145 53 21 -53 5 20 16 39 27 85 94 -32 146 1 24 -53 5 44 145 45 18 -53 4 55 147 3 8 -53 8 33 144 43 42 -53 1 27 145 36 30 -54 30 54 16 39 44 84 75 -31 145 44 50 -54 31 19 145 28 10 -54 30 28 146 48 41 -54 34 13 144 24 28 -54 26 52 145 18 28 -55 56 27 16 40 1 84 59 -30 145 27 5 -55 56 53 145 9 50 -55 56 1 146 33 15 -55 59 54 144 3 50 -55 52 17 144 59 4 -57 22 4 16 40 18 83 48 -29 145 8 2 -57 22 31 144 50 7 -57 21 36 146 16 44 -57 25 39 143 41 37 -57 17 44 144 38 8 -58 47 47 16 40 34 82 41 -28 144 47 27 -58 48 16 144 28 49 -58 47 18 145 58 57 -58 51 32 143 17 34 -58 43 16 144 15 25 -60 13 39 16 40 51 81 35 -27 144 25 8 -60 14 9 144 5 42 -60 13 9 145 39 42 -60 17 34 142 51 25 -60 8 55 143 50 38 -61 39 43 16 41 8 80 31 -26 144 0 47 -61 40 14 143 40 28 -61 39 11 145 18 46 -61 43 50 142 22 50 -61 34 45 143 23 24 -63 6 2 16 41 25 78 29 -25 143 34 4 -63 6 35 143 12 46 -63 5 28 144 55 50 -63 10 22 141 51 23 -63 0 47 142 53 19 -64 32 38 16 41 42 77 27 -24 143 4 32 -64 33 13 142 42 7 -64 32 3 144 30 33 -64 37 13 141 16 34 -64 27 6 142 19 49 -65 59 35 16 41 59 76 25 -22 142 31 38 -66 0 12 142 8 0 -65 58 57 144 2 28 -66 4 27 140 37 44 -65 53 41 141 42 10 -67 26 54 16 42 16 74 24 -21 141 54 42 -67 27 34 141 29 39 -67 26 14 143 30 59 -67 32 7 139 54 4 -67 20 37 140 59 28 -68 54 39 16 42 33 73 23 -20 141 12 48 -68 55 21 140 46 8 -68 53 56 142 55 20 -69 0 14 139 4 29 -68 47 53 140 10 29 -70 22 51 16 42 50 71 23 -19 140 24 45 -70 23 36 139 56 14 -70 22 4 142 14 31 -70 28 54 138 7 36 -70 15 33 139 13 36 -71 51 31 16 43 7 70 23 -18 139 28 57 -71 52 21 138 58 16 -71 50 40 141 27 9 -71 58 7 137 1 32 -71 43 35 138 6 32 -73 20 41 16 43 24 69 23 -17 138 23 10 -73 21 36 137 49 56 -73 19 45 140 31 20 -73 27 55 135 43 42 -73 11 59 136 46 7 -74 50 19 16 43 41 67 24 -16 137 4 16 -74 51 20 136 28 0 -74 49 17 139 24 21 -74 58 21 134 10 32 -74 40 41 135 7 41 -76 20 22 16 43 58 66 25 -15 135 27 40 -76 21 30 134 47 45 -76 19 12 138 2 15 -76 29 23 132 16 49 -76 9 34 133 4 13 -77 50 41 16 44 15 64 26 -13 133 26 27 -77 51 58 132 42 4 -77 49 22 136 18 55 -78 0 57 129 54 51 -77 38 26 130 24 38 -79 21 1 16 44 32 62 28 -12 130 49 39 -79 22 31 129 59 45 -79 19 30 134 4 34 -79 32 55 126 52 44 -79 6 53 126 50 40 -80 50 50 16 44 49 61 31 -11 127 19 7 -80 52 36 126 22 22 -80 49 3 131 2 33 -81 4 56 122 51 28 -80 34 13 121 50 25 -82 19 6 16 45 6 59 36 -10 122 23 5 -82 21 14 121 18 2 -82 16 56 126 42 35 -82 36 17 117 19 29 -81 59 7 114 25 37 -83 43 41 16 45 23 58 43 -8 115 2 52 -83 46 20 113 48 52 -83 40 58 120 4 57 -84 5 19 109 23 32 -83 19 1 102 48 53 -84 59 51 16 45 40 56 54 -7 103 28 39 -85 3 15 102 9 59 -84 56 23 109 3 43 -85 28 4 97 38 11 -84 28 53 84 17 12 -85 57 13 16 45 57 54 72 -6 84 48 33 -86 1 33 83 46 53 -85 52 53 89 29 18 -86 34 0 80 24 5 -85 19 4 58 18 27 -86 17 39 16 46 14 52 97 -4 58 19 33 -86 22 30 58 17 20 -86 12 48 58 26 39 -86 59 39 58 7 49 -85 35 36 32 37 0 -85 48 48 16 46 31 51 123 -3 32 8 45 -85 53 12 33 4 12 -85 44 23 27 51 57 -86 26 10 36 2 59 -85 9 57 14 32 3 -84 41 2 16 46 48 49 140 -2 13 56 14 -84 44 36 15 7 3 -84 37 26 8 52 9 -85 10 28 19 9 27 -84 8 44 3 12 49 -83 10 43 16 47 5 47 152 0 2 39 41 -83 13 35 3 45 29 -83 7 49 - 1 50 38 -83 33 59 7 39 54 -82 44 14 Uncertainty in time = +/- 7 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 8681-00542-1 * constellation : Lupus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 03 04.8657 DE: -52 59 05.396 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .045, .040 ) * V mag [mag]: 11.5 * B mag [mag]: 13.5 * Apparent position with proper motion RA(deg): 225.9271275997 DE(deg): -53.0176878372 * Equation of equinoxes (radians) : 0.000040647634150 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1342) Brabantia approx. diameter [km]: 18 approx. diameter ["]: .021 distance from Earth [AU]: 1.17100 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 580 number of rejected observations: 9 time covered by the observations: 1935 Feb 13 - 2008 Jan 18 1 sigma uncertainty ellipse (major, minor, PA): 0.067, 0.028, 96° remarks: * orbital elements for (1342) Brabantia : Mean anomaly = 19.90160577 deg Arg. of pericenter = 229.55158350 deg Long. of node = 313.03100737 deg Inclination = 20.92118911 deg Eccentricity = 0.20169814 Semimajor axis = 2.28934517 AU Perihelion dist = 1.82758851 AU Mag: H = 11.07, G = 0.15 Epoch of elements : MJD 54550.69400000 TDT (2008 Mar 25.694) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 25 1342 Brabantia 16h 39.4m UT 11.5 15 3 4.866-52 59 5.40TYC 8681-00542-1 13.5 14.3 18 1.9 1.171 0.035 -39.79 152.3989 -52.974 -68.40 2.15 16.6574 -0.06987 -0.00127 0.04535 -5.30023 -0.00336 0.00297 2000 19.7041382008 325.00000229.551584313.031007 20.9211890.20169814 2.2893452 1.827588511.4 5.00.15 RATE 2.8453600 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.081 0.049 94 4.83 0.080 0 54510.5020080325_0542-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org