IOTA/IOTA-ES occultation update for (599) Luisa / 2UCAC 15843133 event on 2008 May 11, 12:20 UT Visible from Australia Summary ------- On 2008 May 11 UT, the 65 km diameter asteroid (599) Luisa will occult a 12.2 mag star in the constellation Corona Australis for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.5 mag (the magnitude of the asteroid) for at most 7.3 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: 79 * date and approx. time of event: 2008 May 11, 12:15 - 2008 May 11, 12:26 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 7.3 * Moon: 44 % sunlit, 140° distance * Sun: 134° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .029", 95° ) * approx speed of asteroid's shadow [km/s]: 8.8806 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 15843133 by 599 Luisa on 2008 May 11 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 ' " Longitude Longitude Longitude Longitude 152 15 13 21 0 0 12 15 15 1 131 -45 151 12 5 153 15 7 ... .. .. ... .. .. 153 18 52 20 0 0 12 15 16 3 132 -46 152 19 40 154 15 23 150 52 40 ... .. .. 154 15 32 19 0 0 12 15 18 4 132 -48 153 19 29 155 9 17 151 57 40 ... .. .. 155 6 14 18 0 0 12 15 21 5 132 -49 154 12 45 155 57 41 152 55 7 157 5 48 155 51 43 17 0 0 12 15 24 6 132 -50 155 0 23 156 41 15 153 46 12 157 47 0 156 32 35 16 0 0 12 15 28 8 133 -51 155 43 5 157 20 29 154 31 46 158 24 12 157 9 19 15 0 0 12 15 33 9 133 -53 156 21 22 157 55 48 155 12 28 158 57 47 157 42 17 14 0 0 12 15 38 10 133 -54 156 55 40 158 27 33 155 48 50 159 28 1 158 11 48 13 0 0 12 15 43 11 133 -55 157 26 19 158 56 1 156 21 15 159 55 9 158 38 7 12 0 0 12 15 49 12 133 -56 157 53 37 159 21 25 156 50 5 160 19 24 159 1 26 11 0 0 12 15 55 13 133 -57 158 17 48 159 43 56 157 15 35 160 40 55 159 21 57 10 0 0 12 16 2 14 133 -58 158 39 4 160 3 46 157 37 58 160 59 52 159 39 48 9 0 0 12 16 9 15 133 -59 158 57 33 160 21 1 157 57 26 161 16 22 159 55 6 8 0 0 12 16 16 15 133 -60 159 13 25 160 35 49 158 14 7 161 30 31 160 7 59 7 0 0 12 16 24 16 133 -61 159 26 46 160 48 16 158 28 10 161 42 25 160 18 32 6 0 0 12 16 32 17 132 -62 159 37 42 160 58 27 158 39 41 161 52 7 160 26 48 5 0 0 12 16 40 18 132 -63 159 46 17 161 6 25 158 48 45 161 59 43 160 32 51 4 0 0 12 16 49 19 132 -64 159 52 35 161 12 14 158 55 25 162 5 14 160 36 44 3 0 0 12 16 58 19 132 -65 159 56 39 161 15 56 158 59 46 162 8 43 160 38 28 2 0 0 12 17 7 20 132 -66 159 58 31 161 17 34 159 1 50 162 10 12 160 38 6 1 0 0 12 17 16 21 131 -66 159 58 13 161 17 8 159 1 38 162 9 41 160 35 38 0 0 0 12 17 26 21 131 -67 159 55 45 161 14 40 158 59 10 162 7 12 160 31 4 - 1 0 0 12 17 36 22 131 -68 159 51 8 161 10 9 158 54 28 162 2 45 160 24 24 - 2 0 0 12 17 47 23 130 -69 159 44 20 161 3 34 158 47 31 161 56 19 160 15 35 - 3 0 0 12 17 57 23 130 -69 159 35 22 160 54 56 158 38 16 161 47 53 160 4 38 - 4 0 0 12 18 8 24 130 -70 159 24 10 160 44 12 158 26 43 161 37 26 159 51 28 - 5 0 0 12 18 20 24 129 -71 159 10 42 160 31 19 158 12 47 161 24 55 159 36 3 - 6 0 0 12 18 31 25 129 -71 158 54 54 160 16 15 157 56 26 161 10 18 159 18 19 - 7 0 0 12 18 43 25 128 -72 158 36 43 159 58 56 157 37 34 160 53 31 158 58 10 - 8 0 0 12 18 55 26 128 -72 158 16 2 159 39 18 157 16 5 160 34 31 158 35 32 - 9 0 0 12 19 8 26 128 -72 157 52 46 159 17 14 156 51 51 160 13 11 158 10 15 -10 0 0 12 19 21 26 127 -72 157 26 46 158 52 38 156 24 45 159 49 26 157 42 13 -11 0 0 12 19 34 27 127 -72 156 57 53 158 25 22 155 54 35 159 23 9 157 11 14 -12 0 0 12 19 47 27 126 -72 156 25 56 157 55 16 155 21 8 158 54 11 Latitude Latitude Latitude Latitude 156 0 0 -13 59 21 12 20 15 27 125 -72 -12 44 41 -15 8 34 -10 49 41 -16 37 5 155 0 0 -15 25 0 12 20 36 27 125 -72 -14 17 13 -16 28 39 -12 35 1 -17 50 57 154 0 0 -16 40 30 12 20 55 27 124 -71 -15 37 48 -17 39 52 -14 4 37 -18 57 15 153 0 0 -17 47 49 12 21 13 27 124 -70 -16 49 5 -18 43 47 -15 22 37 -19 57 12 152 0 0 -18 48 20 12 21 29 27 123 -69 -17 52 46 -19 41 33 -16 31 34 -20 51 39 151 0 0 -19 43 4 12 21 45 27 123 -68 -18 50 6 -20 33 59 -17 33 7 -21 41 19 150 0 0 -20 32 45 12 22 0 26 123 -68 -19 41 57 -21 21 44 -18 28 27 -22 26 42 149 0 0 -21 17 58 12 22 14 26 123 -67 -20 29 0 -22 5 18 -19 18 24 -23 8 14 148 0 0 -21 59 10 12 22 27 26 122 -66 -21 11 46 -22 45 5 -20 3 37 -23 46 16 147 0 0 -22 36 44 12 22 40 25 122 -65 -21 50 41 -23 21 25 -20 44 38 -24 21 4 146 0 0 -23 10 58 12 22 52 25 122 -64 -22 26 5 -23 54 35 -21 21 50 -24 52 53 145 0 0 -23 42 7 12 23 3 24 122 -63 -22 58 15 -24 24 48 -21 55 33 -25 21 56 144 0 0 -24 10 23 12 23 15 24 122 -62 -23 27 24 -24 52 15 -22 26 4 -25 48 21 143 0 0 -24 35 58 12 23 25 23 122 -61 -23 53 45 -25 17 7 -22 53 35 -26 12 19 142 0 0 -24 58 59 12 23 35 23 122 -60 -24 17 26 -25 39 31 -23 18 17 -26 33 56 141 0 0 -25 19 35 12 23 45 22 122 -59 -24 38 37 -25 59 35 -23 40 20 -26 53 19 140 0 0 -25 37 52 12 23 55 22 123 -58 -24 57 24 -26 17 24 -23 59 52 -27 10 33 139 0 0 -25 53 56 12 24 4 21 123 -58 -25 13 53 -26 33 4 -24 16 59 -27 25 42 138 0 0 -26 7 50 12 24 12 20 123 -57 -25 28 9 -26 46 39 -24 31 47 -27 38 51 137 0 0 -26 19 39 12 24 21 20 123 -56 -25 40 15 -26 58 11 -24 44 19 -27 50 3 136 0 0 -26 29 26 12 24 29 19 123 -55 -25 50 15 -27 7 45 -24 54 40 -27 59 20 135 0 0 -26 37 12 12 24 37 19 123 -54 -25 58 12 -27 15 22 -25 2 52 -28 6 44 134 0 0 -26 43 1 12 24 44 18 124 -53 -26 4 7 -27 21 4 -25 8 58 -28 12 18 133 0 0 -26 46 52 12 24 51 17 124 -52 -26 8 2 -27 24 52 -25 12 58 -28 16 1 132 0 0 -26 48 47 12 24 58 16 124 -51 -26 9 58 -27 26 46 -25 14 54 -28 17 55 131 0 0 -26 48 46 12 25 5 16 125 -51 -26 9 54 -27 26 48 -25 14 46 -28 18 0 130 0 0 -26 46 48 12 25 11 15 125 -50 -26 7 50 -27 24 56 -25 12 32 -28 16 15 129 0 0 -26 42 53 12 25 17 14 125 -49 -26 3 45 -27 21 9 -25 8 13 -28 12 40 128 0 0 -26 36 58 12 25 23 14 126 -48 -25 57 37 -27 15 27 -25 1 46 -28 7 13 127 0 0 -26 29 2 12 25 29 13 126 -47 -25 49 25 -27 7 46 -24 53 8 -27 59 53 126 0 0 -26 19 2 12 25 34 12 126 -46 -25 39 4 -26 58 6 -24 42 16 -27 50 36 125 0 0 -26 6 55 12 25 39 11 127 -45 -25 26 32 -26 46 21 -24 29 6 -27 39 21 124 0 0 -25 52 35 12 25 44 10 127 -44 -25 11 43 -26 32 29 -24 13 33 -27 26 3 123 0 0 -25 35 59 12 25 48 9 127 -44 -24 54 32 -26 16 24 -23 55 30 -27 10 38 122 0 0 -25 16 59 12 25 52 8 128 -43 -24 34 52 -25 58 1 -23 34 50 -26 53 2 121 0 0 -24 55 28 12 25 56 8 128 -42 -24 12 36 -25 37 12 -23 11 24 -26 33 7 120 0 0 -24 31 18 12 25 59 7 128 -41 -23 47 33 -25 13 51 -22 45 0 -26 10 47 119 0 0 -24 4 18 12 26 2 6 129 -40 -23 19 32 -24 47 46 -22 15 25 -25 45 53 118 0 0 -23 34 15 12 26 5 5 129 -39 -22 48 19 -24 18 48 -21 42 22 .. .. .. 117 0 0 -23 0 54 12 26 7 4 130 -38 -22 13 37 -23 46 42 -21 5 33 .. .. .. 116 0 0 -22 23 58 12 26 8 2 130 -37 -21 35 5 -23 11 11 -20 24 32 .. .. .. 115 0 0 -21 43 2 12 26 9 1 130 -36 -20 52 18 -22 31 56 .. .. .. .. .. .. 114 0 0 -20 57 40 12 26 10 0 131 -35 .. .. .. -21 48 32 .. .. .. .. .. .. Uncertainty in time = +/- 5 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: 2UCAC 15843133 * constellation : Corona Australis * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 27 42.6769 DE: -37 35 06.971 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 12.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (599) Luisa approx. diameter [km]: 65 approx. diameter ["]: .057 distance from Earth [AU]: 1.57800 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 876 number of rejected observations: 56 time covered by the observations: 1906 Apr 29 - 2008 Apr 23 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.018, 97° remarks: * orbital elements for (599) Luisa : Mean anomaly = 312.88509753 deg Arg. of pericenter = 292.82703074 deg Long. of node = 44.68358998 deg Inclination = 16.66572570 deg Eccentricity = 0.29380913 Semimajor axis = 2.77230906 AU Perihelion dist = 1.95777935 AU Mag: H = 8.80, G = 0.15 Epoch of elements : MJD 54597.51400000 TDT (2008 May 11.514) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 11 599 Luisa 12h 20.7m UT 12.2 18 27 42.677-37 35 6.972UCAC 15843133 0.0 12.5 65 7.3 1.578 -0.025 -27.94 -137.9078 -37.577 -6.08 18.06 12.3451 -0.88945 0.00883 -0.04964 -5.01219 -0.00385 0.00078 2000 311.2806972008 5 4.00000292.827031 44.683590 16.6657260.29380913 2.7723091 1.9577793 8.7 5.00.15 RATE 2.1352150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.029 95 1.69 0.039 0 54594.5020080511_843133 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org