IOTA/IOTA-ES occultation update for (1041) Asta / TYC 5836-00529-1 event on 2008 May 15, 18:25 UT Visible from N Australia Summary ------- On 2008 May 15 UT, the 57 km diameter asteroid (1041) Asta will occult a 8.9 mag star in the constellation Aquarius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.8 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: 60 * date and approx. time of event: 2008 May 15, 18:22 - 2008 May 15, 18:24 UT * midpoint of event [JD]: 2454602.26786667 * magnitude of target star: 8.9 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 1.8 * Moon: 83 % sunlit, 158° distance * Sun: 64° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 57 * 1 sigma uncertainty interval [path widths]: +/- 1.03 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .026", 76° ) * approx speed of asteroid's shadow [km/s]: 31.3718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5836-00529-1 by 1041 Asta on 2008 May 15 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 115 0 0 -14 36 59 18 22 20 1 105 -60 -14 53 0 -14 20 59 -15 25 59 -13 47 59 116 0 0 -14 52 36 18 22 20 2 105 -59 -15 8 36 -14 36 37 -15 41 32 -14 3 40 117 0 0 -15 7 54 18 22 21 3 105 -58 -15 23 52 -14 51 56 -15 56 46 -14 19 1 118 0 0 -15 22 52 18 22 21 4 104 -57 -15 38 49 -15 6 55 -16 11 40 -14 34 3 119 0 0 -15 37 31 18 22 21 5 104 -56 -15 53 26 -15 21 35 -16 26 15 -14 48 45 120 0 0 -15 51 49 18 22 21 6 104 -55 -16 7 44 -15 35 55 -16 40 30 -15 3 8 121 0 0 -16 5 48 18 22 22 7 104 -54 -16 21 41 -15 49 54 -16 54 24 -15 17 10 122 0 0 -16 19 26 18 22 22 8 103 -53 -16 35 18 -16 3 34 -17 7 59 -15 30 52 123 0 0 -16 32 44 18 22 23 9 103 -52 -16 48 35 -16 16 53 -17 21 13 -15 44 13 124 0 0 -16 45 41 18 22 23 10 103 -51 -17 1 31 -16 29 51 -17 34 7 -15 57 14 125 0 0 -16 58 18 18 22 24 11 102 -51 -17 14 7 -16 42 29 -17 46 40 -16 9 55 126 0 0 -17 10 34 18 22 25 12 102 -50 -17 26 21 -16 54 46 -17 58 53 -16 22 14 127 0 0 -17 22 29 18 22 25 13 102 -49 -17 38 15 -17 6 43 -18 10 44 -16 34 13 128 0 0 -17 34 3 18 22 26 14 102 -48 -17 49 48 -17 18 18 -18 22 15 -16 45 50 129 0 0 -17 45 16 18 22 27 15 101 -47 -18 1 0 -17 29 32 -18 33 25 -16 57 6 130 0 0 -17 56 8 18 22 28 16 101 -46 -18 11 51 -17 40 25 -18 44 13 -17 8 1 131 0 0 -18 6 38 18 22 29 17 101 -45 -18 22 20 -17 50 56 -18 54 41 -17 18 35 132 0 0 -18 16 47 18 22 30 18 100 -44 -18 32 28 -18 1 6 -19 4 47 -17 28 47 133 0 0 -18 26 35 18 22 31 19 100 -43 -18 42 15 -18 10 54 -19 14 31 -17 38 37 134 0 0 -18 36 0 18 22 32 20 100 -42 -18 51 40 -18 20 21 -19 23 54 -17 48 6 135 0 0 -18 45 5 18 22 33 21 99 -41 -19 0 43 -18 29 26 -19 32 55 -17 57 13 136 0 0 -18 53 47 18 22 34 22 99 -40 -19 9 25 -18 38 10 -19 41 35 -18 5 58 137 0 0 -19 2 8 18 22 36 22 99 -40 -19 17 44 -18 46 31 -19 49 53 -18 14 21 138 0 0 -19 10 7 18 22 37 23 98 -39 -19 25 42 -18 54 31 -19 57 50 -18 22 22 139 0 0 -19 17 44 18 22 38 24 98 -38 -19 33 18 -19 2 8 -20 5 24 -18 30 2 140 0 0 -19 24 58 18 22 40 25 98 -37 -19 40 33 -19 9 24 -20 12 37 -18 37 19 141 0 0 -19 31 51 18 22 41 26 97 -36 -19 47 25 -19 16 18 -20 19 27 -18 44 14 142 0 0 -19 38 22 18 22 43 27 97 -35 -19 53 55 -19 22 49 -20 25 56 -18 50 47 143 0 0 -19 44 31 18 22 44 28 97 -34 -20 0 3 -19 28 59 -20 32 3 -18 56 58 144 0 0 -19 50 17 18 22 46 29 96 -33 -20 5 49 -19 34 46 -20 37 48 -19 2 46 145 0 0 -19 55 42 18 22 48 30 96 -32 -20 11 13 -19 40 11 -20 43 10 -19 8 12 146 0 0 -20 0 44 18 22 49 31 96 -31 -20 16 14 -19 45 13 -20 48 11 -19 13 16 147 0 0 -20 5 24 18 22 51 32 95 -30 -20 20 54 -19 49 54 -20 52 49 -19 17 57 148 0 0 -20 9 41 18 22 53 33 95 -29 -20 25 11 -19 54 12 -20 57 5 -19 22 16 149 0 0 -20 13 36 18 22 55 34 95 -29 -20 29 5 -19 58 7 -21 0 59 -19 26 13 150 0 0 -20 17 9 18 22 57 35 94 -28 -20 32 38 -20 1 40 -21 4 30 -19 29 47 151 0 0 -20 20 19 18 22 59 36 94 -27 -20 35 48 -20 4 51 -21 7 40 -19 32 58 152 0 0 -20 23 7 18 23 1 37 94 -26 -20 38 35 -20 7 39 -21 10 27 -19 35 47 153 0 0 -20 25 33 18 23 3 38 93 -25 -20 41 1 -20 10 5 -21 12 51 -19 38 13 154 0 0 -20 27 36 18 23 5 39 93 -24 -20 43 4 -20 12 8 -21 14 54 -19 40 17 155 0 0 -20 29 17 18 23 7 40 93 -23 -20 44 44 -20 13 49 -21 16 34 -19 41 58 156 0 0 -20 30 35 18 23 9 41 92 -22 -20 46 2 -20 15 7 -21 17 52 -19 43 17 157 0 0 -20 31 30 18 23 11 41 92 -21 -20 46 57 -20 16 3 -21 18 47 -19 44 13 158 0 0 -20 32 3 18 23 14 42 92 -20 -20 47 30 -20 16 36 -21 19 20 -19 44 46 159 0 0 -20 32 14 18 23 16 43 91 -19 -20 47 41 -20 16 47 -21 19 30 -19 44 56 160 0 0 -20 32 2 18 23 18 44 91 -18 -20 47 29 -20 16 35 -21 19 18 -19 44 44 161 0 0 -20 31 27 18 23 21 45 91 -18 -20 46 54 -20 16 0 -21 18 44 -19 44 9 162 0 0 -20 30 30 18 23 23 46 90 -17 -20 45 57 -20 15 3 -21 17 47 -19 43 12 163 0 0 -20 29 10 18 23 25 47 90 -16 -20 44 37 -20 13 43 -21 16 27 -19 41 52 164 0 0 -20 27 28 18 23 28 48 90 -15 -20 42 55 -20 12 0 -21 14 46 -19 40 9 165 0 0 -20 25 23 18 23 30 49 89 -14 -20 40 51 -20 9 55 -21 12 41 -19 38 3 166 0 0 -20 22 55 18 23 33 50 89 -13 -20 38 23 -20 7 27 -21 10 15 -19 35 35 167 0 0 -20 20 5 18 23 36 51 89 -12 -20 35 33 -20 4 37 -21 7 25 -19 32 43 168 0 0 -20 16 52 18 23 38 52 89 -11 -20 32 21 -20 1 23 -21 4 14 -19 29 30 169 0 0 -20 13 17 18 23 41 53 88 -10 -20 28 46 -19 57 48 -21 0 40 -19 25 53 170 0 0 -20 9 19 18 23 44 54 88 -9 -20 24 48 -19 53 49 -20 56 43 -19 21 54 171 0 0 -20 4 58 18 23 46 55 88 -8 -20 20 28 -19 49 28 -20 52 24 -19 17 32 172 0 0 -20 0 15 18 23 49 56 87 -7 -20 15 46 -19 44 45 -20 47 42 -19 12 47 173 0 0 -19 55 10 18 23 52 57 87 -6 -20 10 41 -19 39 38 -20 42 38 -19 7 40 174 0 0 -19 49 41 18 23 55 58 87 -6 -20 5 13 -19 34 10 -20 37 12 -19 2 10 175 0 0 -19 43 50 18 23 58 59 87 -5 -19 59 23 -19 28 18 -20 31 23 -18 56 17 176 0 0 -19 37 37 18 24 1 60 86 -4 -19 53 10 -19 22 4 -20 25 12 -18 50 1 177 0 0 -19 31 1 18 24 4 60 86 -3 -19 46 35 -19 15 28 -20 18 38 -18 43 23 178 0 0 -19 24 3 18 24 7 61 86 -2 -19 39 37 -19 8 28 -20 11 42 -18 36 23 179 0 0 -19 16 42 18 24 10 62 86 -1 -19 32 17 -19 1 7 -20 4 24 -18 29 0 Uncertainty in time = +/- 2 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: TYC 5836-00529-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 49 11.8928 DE: -14 55 09.095 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .021 ) * V mag [mag]: 8.9 * B mag [mag]: 10.0 * Apparent position with proper motion RA(deg): 357.4073346772 DE(deg): -14.8717814806 * Equation of equinoxes (radians) : 0.000040059902205 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1041) Asta approx. diameter [km]: 57 approx. diameter ["]: .025 distance from Earth [AU]: 3.16600 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 642 number of rejected observations: 38 time covered by the observations: 1906 Dec 18 - 2007 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.016, 62° remarks: * orbital elements for (1041) Asta : Mean anomaly = 304.62083874 deg Arg. of pericenter = 342.05108828 deg Long. of node = 60.29690855 deg Inclination = 13.89994099 deg Eccentricity = 0.13973717 Semimajor axis = 3.07470011 AU Perihelion dist = 2.64505021 AU Mag: H = 10.07, G = 0.15 Epoch of elements : MJD 54601.76800000 TDT (2008 May 15.768) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 1041 Asta 18h 25.7m UT 8.9 23 49 11.893-14 55 9.09TYC 5836-00529-1 10.0 15.6 57 1.8 3.166 3.256 13.82 -152.9829 -14.923 -97.34 19.09 18.4288 -0.00637 0.02607 16.99301 4.97791 -0.00439 -0.00254 2000 304.2976312008 514.00000342.051088 60.296909 13.8999410.13973717 3.0747001 2.6450502 9.9 5.00.15 RATE 1.8281000 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.026 76 2.03 0.026 0 54565.5020080515_0529-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 09, 17:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org