IOTA/IOTA-ES occultation update for (1548) Palomaa / TYC 0097-01070-1 event on 2012 Sep 04, 17:31 UT Visible from Australia Summary ------- On 2012 Sep 04 UT, the 32 km diameter asteroid (1548) Palomaa will occult a 10.4 mag star in the constellation Orion 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 6.7 mag to 17.1 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 Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 31 * date and approx. time of event: 2012 Sep 04, 17:26 - 2012 Sep 04, 17:32 UT * geocentric midpoint of event [JD]: 2456175.23020833 * magnitude of target star: 10.4 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 1.9 * Moon: 83 % sunlit, 46° distance * Sun: 88° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 2.16 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .034", 77° ) * approx speed of asteroid's shadow [km/s]: 16.7078 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0097-01070-1 by 1548 Palomaa on 2012 Sep 4 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 104 0 0 -28 2 11 17 26 25 1 82 -68 -28 13 7 -27 51 18 -29 0 37 .. .. .. 105 0 0 -27 54 54 17 26 25 2 81 -68 -28 5 49 -27 44 0 -28 53 18 .. .. .. 106 0 0 -27 47 47 17 26 25 3 81 -68 -27 58 42 -27 36 54 -28 46 10 .. .. .. 107 0 0 -27 40 52 17 26 26 3 80 -68 -27 51 46 -27 29 59 -28 39 13 .. .. .. 108 0 0 -27 34 7 17 26 26 4 80 -67 -27 45 1 -27 23 14 -28 32 26 .. .. .. 109 0 0 -27 27 33 17 26 27 5 79 -67 -27 38 28 -27 16 41 -28 25 52 .. .. .. 110 0 0 -27 21 11 17 26 28 6 79 -67 -27 32 5 -27 10 19 -28 19 28 -26 23 38 111 0 0 -27 15 1 17 26 28 7 78 -66 -27 25 55 -27 4 9 -28 13 17 -26 17 29 112 0 0 -27 9 2 17 26 29 8 78 -66 -27 19 56 -26 58 10 -28 7 17 -26 11 31 113 0 0 -27 3 15 17 26 31 9 77 -65 -27 14 8 -26 52 24 -28 1 28 -26 5 46 114 0 0 -26 57 40 17 26 32 10 77 -65 -27 8 33 -26 46 49 -27 55 52 -26 0 12 115 0 0 -26 52 18 17 26 33 11 76 -64 -27 3 10 -26 41 26 -27 50 28 -25 54 50 116 0 0 -26 47 7 17 26 34 12 76 -64 -26 58 0 -26 36 16 -27 45 17 -25 49 41 117 0 0 -26 42 9 17 26 36 12 75 -63 -26 53 1 -26 31 18 -27 40 18 -25 44 43 118 0 0 -26 37 23 17 26 38 13 75 -63 -26 48 16 -26 26 33 -27 35 31 -25 39 59 119 0 0 -26 32 50 17 26 40 14 74 -62 -26 43 42 -26 22 0 -27 30 57 -25 35 27 120 0 0 -26 28 30 17 26 41 15 74 -61 -26 39 22 -26 17 40 -27 26 36 -25 31 8 121 0 0 -26 24 23 17 26 43 16 73 -61 -26 35 15 -26 13 33 -27 22 28 -25 27 1 122 0 0 -26 20 29 17 26 46 17 73 -60 -26 31 20 -26 9 39 -27 18 33 -25 23 8 123 0 0 -26 16 48 17 26 48 18 72 -59 -26 27 39 -26 5 58 -27 14 51 -25 19 27 124 0 0 -26 13 20 17 26 50 19 72 -59 -26 24 11 -26 2 30 -27 11 22 -25 16 0 125 0 0 -26 10 5 17 26 53 20 71 -58 -26 20 56 -25 59 15 -27 8 7 -25 12 46 126 0 0 -26 7 3 17 26 55 20 71 -57 -26 17 55 -25 56 14 -27 5 5 -25 9 45 127 0 0 -26 4 16 17 26 58 21 70 -56 -26 15 7 -25 53 26 -27 2 17 -25 6 57 128 0 0 -26 1 41 17 27 1 22 70 -56 -26 12 32 -25 50 52 -26 59 42 -25 4 24 129 0 0 -25 59 21 17 27 4 23 69 -55 -26 10 11 -25 48 31 -26 57 21 -25 2 3 130 0 0 -25 57 13 17 27 7 24 69 -54 -26 8 4 -25 46 24 -26 55 13 -24 59 57 131 0 0 -25 55 20 17 27 10 25 68 -53 -26 6 11 -25 44 31 -26 53 20 -24 58 4 132 0 0 -25 53 41 17 27 13 26 67 -52 -26 4 31 -25 42 52 -26 51 40 -24 56 24 133 0 0 -25 52 15 17 27 16 26 67 -52 -26 3 6 -25 41 26 -26 50 14 -24 54 59 134 0 0 -25 51 3 17 27 20 27 66 -51 -26 1 54 -25 40 14 -26 49 2 -24 53 47 135 0 0 -25 50 6 17 27 23 28 66 -50 -26 0 56 -25 39 16 -26 48 5 -24 52 50 136 0 0 -25 49 22 17 27 27 29 65 -49 -26 0 12 -25 38 33 -26 47 21 -24 52 6 137 0 0 -25 48 52 17 27 31 30 64 -48 -25 59 43 -25 38 3 -26 46 51 -24 51 36 138 0 0 -25 48 36 17 27 34 31 64 -47 -25 59 27 -25 37 47 -26 46 35 -24 51 20 139 0 0 -25 48 35 17 27 38 31 63 -46 -25 59 25 -25 37 46 -26 46 34 -24 51 18 140 0 0 -25 48 47 17 27 42 32 62 -46 -25 59 38 -25 37 58 -26 46 47 -24 51 31 141 0 0 -25 49 14 17 27 46 33 62 -45 -26 0 4 -25 38 24 -26 47 14 -24 51 57 142 0 0 -25 49 54 17 27 51 34 61 -44 -26 0 45 -25 39 5 -26 47 55 -24 52 37 143 0 0 -25 50 49 17 27 55 35 60 -43 -26 1 40 -25 40 0 -26 48 50 -24 53 32 144 0 0 -25 51 58 17 27 59 35 59 -42 -26 2 49 -25 41 9 -26 49 59 -24 54 40 145 0 0 -25 53 21 17 28 4 36 58 -41 -26 4 12 -25 42 32 -26 51 23 -24 56 3 146 0 0 -25 54 58 17 28 8 37 58 -40 -26 5 49 -25 44 8 -26 53 0 -24 57 39 147 0 0 -25 56 49 17 28 13 38 57 -39 -26 7 41 -25 45 59 -26 54 52 -24 59 30 148 0 0 -25 58 54 17 28 18 38 56 -38 -26 9 46 -25 48 5 -26 56 58 -25 1 34 149 0 0 -26 1 14 17 28 22 39 55 -38 -26 12 5 -25 50 24 -26 59 18 -25 3 52 150 0 0 -26 3 47 17 28 27 40 54 -37 -26 14 38 -25 52 56 -27 1 52 -25 6 25 151 0 0 -26 6 34 17 28 32 41 53 -36 -26 17 26 -25 55 43 -27 4 40 -25 9 11 152 0 0 -26 9 35 17 28 37 41 52 -35 -26 20 27 -25 58 44 -27 7 41 -25 12 11 153 0 0 -26 12 49 17 28 42 42 51 -34 -26 23 41 -26 1 59 -27 10 57 -25 15 25 154 0 0 -26 16 18 17 28 48 43 50 -33 -26 27 10 -26 5 27 -27 14 27 -25 18 52 155 0 0 -26 20 0 17 28 53 43 49 -32 -26 30 52 -26 9 9 -27 18 10 -25 22 33 156 0 0 -26 23 56 17 28 58 44 48 -31 -26 34 48 -26 13 4 -27 22 7 -25 26 28 157 0 0 -26 28 5 17 29 3 45 47 -30 -26 38 58 -26 17 13 -27 26 17 -25 30 36 158 0 0 -26 32 28 17 29 9 45 46 -29 -26 43 21 -26 21 36 -27 30 41 -25 34 58 159 0 0 -26 37 4 17 29 14 46 45 -28 -26 47 57 -26 26 12 -27 35 18 -25 39 33 160 0 0 -26 41 53 17 29 20 46 44 -27 -26 52 47 -26 31 1 -27 40 9 -25 44 21 161 0 0 -26 46 55 17 29 25 47 42 -27 -26 57 49 -26 36 3 -27 45 13 -25 49 22 162 0 0 -26 52 11 17 29 31 47 41 -26 -27 3 5 -26 41 18 -27 50 30 -25 54 36 163 0 0 -26 57 39 17 29 36 48 40 -25 -27 8 34 -26 46 47 -27 55 59 -26 0 3 164 0 0 -27 3 21 17 29 42 49 38 -24 -27 14 15 -26 52 28 -28 1 42 -26 5 43 165 0 0 -27 9 15 17 29 48 49 37 -23 -27 20 10 -26 58 21 -28 7 38 -26 11 36 166 0 0 -27 15 21 17 29 54 49 36 -22 -27 26 16 -27 4 27 -28 13 46 -26 17 41 167 0 0 -27 21 40 17 30 0 50 34 -21 -27 32 36 -27 10 46 -28 20 6 -26 23 58 168 0 0 -27 28 11 17 30 5 50 33 -20 -27 39 7 -27 17 17 -28 26 39 -26 30 28 169 0 0 -27 34 55 17 30 11 51 31 -19 -27 45 51 -27 24 0 -28 33 24 -26 37 10 170 0 0 -27 41 50 17 30 17 51 30 -18 -27 52 47 -27 30 55 -28 40 21 -26 44 3 171 0 0 -27 48 57 17 30 23 51 28 -17 -27 59 54 -27 38 2 -28 47 30 -26 51 9 172 0 0 -27 56 16 17 30 29 52 27 -16 -28 7 13 -27 45 21 -28 54 50 -26 58 26 173 0 0 -28 3 46 17 30 35 52 25 -16 -28 14 44 -27 52 51 -29 2 22 -27 5 55 174 0 0 -28 11 28 17 30 41 52 24 -15 -28 22 26 -28 0 32 -29 10 6 -27 13 35 175 0 0 -28 19 21 17 30 47 52 22 -14 -28 30 19 -28 8 24 -29 18 0 -27 21 26 176 0 0 -28 27 25 17 30 53 53 20 -13 -28 38 23 -28 16 28 -29 26 6 -27 29 28 177 0 0 -28 35 39 17 30 59 53 19 -12 -28 46 38 -28 24 42 -29 34 22 -27 37 41 178 0 0 -28 44 4 17 31 5 53 17 -11 -28 55 3 -28 33 7 -29 42 49 -27 46 4 179 0 0 -28 52 40 17 31 11 53 15 -10 -29 3 39 -28 41 42 -29 51 26 -27 54 38 180 0 0 -29 1 25 17 31 17 53 13 -9 -29 12 25 -28 50 27 -30 0 13 -28 3 22 -179 0 0 -29 10 21 17 31 23 53 12 -8 -29 21 21 -28 59 22 -30 9 10 -28 12 16 -178 0 0 -29 19 26 17 31 29 53 10 -8 -29 30 26 -29 8 27 -30 18 17 -28 21 19 -177 0 0 -29 28 41 17 31 35 53 8 -7 -29 39 41 -29 17 42 -30 27 34 -28 30 32 -176 0 0 -29 38 5 17 31 41 53 7 -6 -29 49 6 -29 27 5 -30 37 0 -28 39 55 -175 0 0 -29 47 38 17 31 47 53 5 -5 -29 58 39 -29 36 38 -30 46 35 -28 49 26 -174 0 0 -29 57 20 17 31 53 53 3 -4 -30 8 22 -29 46 20 -30 56 19 -28 59 7 -173 0 0 -30 7 11 17 31 59 53 1 -3 -30 18 13 -29 56 10 -31 6 11 -29 8 56 -172 0 0 -30 17 10 17 32 5 53 360 -2 -30 28 12 -30 6 9 -31 16 12 -29 18 53 -171 0 0 -30 27 17 17 32 11 53 358 -1 -30 38 19 -30 16 16 -31 26 20 -29 28 58 -170 0 0 -30 37 32 17 32 17 52 356 -1 -30 48 34 -30 26 30 -31 36 37 -29 39 12 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 0097-01070-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 59 50.2379 DE: +07 05 03.683 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 10.4 * B mag [mag]: 11.6 * Apparent position with proper motion RA(deg): 75.1341432081 DE(deg): 7.1034032827 * Equation of equinoxes (radians) : 0.000068980725118 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1548) Palomaa approx. diameter [km]: 32 approx. diameter ["]: .016 distance from Earth [AU]: 2.84100 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 776 number of rejected observations: 16 time covered by the observations: 1935 Mar 26 - 2011 Oct 31 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.023, 69° remarks: * orbital elements for (1548) Palomaa : Mean anomaly = 213.90796587 deg Arg. of pericenter = 86.83230758 deg Long. of node = 117.01801914 deg Inclination = 16.51993945 deg Eccentricity = 0.07958935 Semimajor axis = 2.79085944 AU Perihelion dist = 2.56873675 AU Mag: H = 11.47, G = 0.15 Epoch of elements : MJD 56174.73000000 TDT (2012 Sep 04.730) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 4 1548 Palomaa 17h 31.5m UT 10.4 4 59 50.238 7 5 3.68TYC 0097-01070-1 11.6 17.1 32 1.9 2.841 1.939 -4.32 -172.1545 7.085 -83.17 6.84 17.5250 -0.08980 -0.59069 9.32684 -1.39331 -0.00563 -0.00067 2000 212.9080622012 831.00000 86.832308117.018019 16.5199390.07958935 2.7908594 2.568736811.5 5.00.15 RATE 2.1139620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.034 77 3.16 0.035 0 0-1 3 056116.0020120904_1070-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 08, 04:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org