IOTA/IOTA-ES occultation update for (706) Hirundo / UCAC2 30778465 event on 2009 Oct 09, 09:03 UT Visible from Summary ------- On 2009 Oct 09 UT, the 29 km diameter asteroid (706) Hirundo will occult a 11.1 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.6 mag (the magnitude of the asteroid) for at most 10.9 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: 33 * date and approx. time of event: 2009 Oct 09, 08:35 - 2009 Oct 09, 09:23 UT * midpoint of event [JD]: 2455113.87755833 * magnitude of target star: 11.1 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 10.9 * Moon: 72 % sunlit, 110° distance * Sun: 132° distance * rough path description: Additional comments ------------------- Wide double star The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 2.05 * 1 sigma uncertainty interval [seconds]: +/- 18.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .048", 66° ) * approx speed of asteroid's shadow [km/s]: 2.6835 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 30778465 by 706 Hirundo on 2009 Oct 9 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 153 17 30 -63 50 53 8 35 8 26 32 -1 152 52 40 -63 56 41 153 42 3 -63 45 6 151 7 47 -64 20 32 155 19 59 -63 21 26 154 7 52 -61 38 36 8 35 58 28 31 -2 153 45 42 -61 44 3 154 29 50 -61 33 9 152 12 27 -62 6 30 155 57 47 -61 10 51 154 40 35 -59 33 57 8 36 48 30 31 -3 154 20 24 -59 39 8 155 0 37 -59 28 47 152 55 47 -60 0 24 156 21 0 -59 7 38 155 0 55 -57 35 38 8 37 39 32 31 -4 154 42 17 -57 40 34 155 19 26 -57 30 42 153 24 21 -58 0 51 156 33 54 -57 10 31 155 12 12 -55 42 39 8 38 29 34 31 -5 154 54 48 -55 47 23 155 29 29 -55 37 55 153 42 11 -56 6 49 156 39 10 -55 18 34 155 16 37 -53 54 13 8 39 20 35 31 -5 155 0 14 -53 58 47 155 32 54 -53 49 40 153 51 59 -54 17 29 156 38 38 -53 31 2 155 15 42 -52 9 45 8 40 10 37 32 -6 155 0 10 -52 14 9 155 31 9 -52 5 22 153 55 34 -52 32 13 156 33 35 -51 47 22 155 10 33 -50 28 45 8 41 0 38 32 -7 154 55 45 -50 33 1 155 25 17 -50 24 30 153 54 13 -50 50 30 156 24 53 -50 7 4 155 1 58 -48 50 49 8 41 51 40 33 -7 154 47 47 -48 54 57 155 16 5 -48 46 41 153 48 54 -49 11 56 156 13 15 -48 29 45 154 50 32 -47 15 36 8 42 41 41 34 -8 154 36 54 -47 19 38 155 4 7 -47 11 35 153 40 18 -47 36 9 155 59 10 -46 55 6 154 36 43 -45 42 50 8 43 32 42 34 -8 154 23 33 -45 46 45 154 49 50 -45 38 54 153 28 58 -46 2 51 155 43 0 -45 22 50 154 20 52 -44 12 15 8 44 22 44 35 -9 154 8 8 -44 16 5 154 33 34 -44 8 25 153 15 19 -44 31 49 155 25 5 -43 52 43 154 3 16 -42 43 40 8 45 12 45 36 -9 153 50 54 -42 47 25 154 15 35 -42 39 55 152 59 40 -43 2 48 155 5 38 -42 24 33 153 44 8 -41 16 53 8 46 3 46 37 -9 153 32 6 -41 20 33 153 56 7 -41 13 12 152 42 17 -41 35 38 154 44 50 -40 58 9 153 23 38 -39 51 44 8 46 53 47 38 -10 153 11 54 -39 55 21 153 35 20 -39 48 8 152 23 22 -40 10 8 154 22 51 -39 33 21 153 1 56 -38 28 6 8 47 44 48 39 -10 152 50 28 -38 31 39 153 13 21 -38 24 34 152 3 4 -38 46 10 153 59 47 -38 10 3 152 39 8 -37 5 51 8 48 34 49 41 -10 152 27 55 -37 9 20 152 50 19 -37 2 22 151 41 34 -37 23 37 153 35 46 -36 48 6 152 15 20 -35 44 52 8 49 24 50 42 -10 152 4 21 -35 48 18 152 26 17 -35 41 26 151 18 56 -36 2 21 153 10 51 -35 27 23 151 50 37 -34 25 3 8 50 15 51 43 -11 151 39 50 -34 28 25 152 1 22 -34 21 40 150 55 17 -34 42 16 152 45 7 -34 7 50 151 25 2 -33 6 18 8 51 5 51 45 -11 151 14 27 -33 9 38 151 35 36 -33 2 58 150 30 41 -33 23 17 152 18 36 -32 49 19 150 58 39 -31 48 33 8 51 56 52 46 -11 150 48 14 -31 51 50 151 9 3 -31 45 16 150 5 11 -32 5 18 151 51 22 -31 31 48 150 31 31 -30 31 43 8 52 46 53 48 -11 150 21 15 -30 34 58 150 41 45 -30 28 28 149 38 52 -30 48 16 151 23 26 -30 15 10 150 3 38 -29 15 44 8 53 36 54 49 -11 149 53 31 -29 18 56 150 13 44 -29 12 31 149 11 44 -29 32 5 150 54 51 -28 59 22 149 35 4 -28 0 31 8 54 27 54 51 -11 149 25 5 -28 3 42 149 45 2 -27 57 21 148 43 52 -28 16 42 150 25 37 -27 44 21 149 5 49 -26 46 2 8 55 17 55 53 -11 148 55 57 -26 49 11 149 15 40 -26 42 54 148 15 14 -27 2 2 149 55 45 -26 30 2 148 35 54 -25 32 14 8 56 8 55 54 -11 148 26 9 -25 35 20 148 45 38 -25 29 7 147 45 55 -25 48 4 149 25 17 -25 16 22 148 5 20 -24 19 2 8 56 58 56 56 -11 147 55 41 -24 22 7 148 14 58 -24 15 57 147 15 53 -24 34 43 148 54 12 -24 3 19 147 34 8 -23 6 24 8 57 48 56 58 -11 147 24 35 -23 9 27 147 43 40 -23 3 21 146 45 9 -23 21 57 148 22 31 -22 50 50 147 2 17 -21 54 18 8 58 39 57 60 -11 146 52 49 -21 57 19 147 11 44 -21 51 16 146 13 45 -22 9 43 147 50 14 -21 38 51 146 29 47 -20 42 40 8 59 29 57 62 -11 146 20 24 -20 45 40 146 39 9 -20 39 40 145 41 40 -20 57 58 147 17 21 -20 27 21 145 56 39 -19 31 29 9 0 19 57 64 -11 145 47 20 -19 34 28 146 5 57 -19 28 30 145 8 54 -19 46 40 146 43 51 -19 16 16 145 22 52 -18 20 42 9 1 10 57 66 -11 145 13 36 -18 23 39 145 32 6 -18 17 44 144 35 27 -18 35 47 146 9 44 -18 5 35 144 48 24 -17 10 16 9 2 0 58 68 -11 144 39 13 -17 13 13 144 57 35 -17 7 20 144 1 18 -17 25 16 145 35 0 -16 55 16 144 13 17 -16 0 11 9 2 51 58 70 -11 144 4 8 -16 3 6 144 22 24 -15 57 15 143 26 26 -16 15 5 144 59 36 -15 45 16 143 37 28 -14 50 23 9 3 41 58 72 -11 143 28 22 -14 53 17 143 46 33 -14 47 28 142 50 52 -15 5 12 144 23 34 -14 35 33 143 0 56 -13 40 51 9 4 31 58 74 -10 142 51 53 -13 43 44 143 9 59 -13 37 57 142 14 33 -13 55 35 143 46 50 -13 26 5 142 23 41 -12 31 32 9 5 22 58 76 -10 142 14 40 -12 34 25 142 32 41 -12 28 39 141 37 29 -12 46 12 143 9 24 -12 16 51 141 45 41 -11 22 26 9 6 12 57 78 -10 141 36 41 -11 25 17 141 54 39 -11 19 34 140 59 37 -11 37 1 142 31 15 -11 7 48 141 6 53 -10 13 29 9 7 3 57 80 -10 140 57 55 -10 16 20 141 15 50 -10 10 38 140 20 57 -10 28 1 141 52 20 - 9 58 55 140 27 17 - 9 4 41 9 7 53 57 82 -9 140 18 20 - 9 7 31 140 36 13 - 9 1 50 139 41 27 - 9 19 10 141 12 38 - 8 50 10 139 46 50 - 7 55 59 9 8 43 57 84 -9 139 37 54 - 7 58 49 139 55 45 - 7 53 9 139 1 4 - 8 10 25 140 32 7 - 7 41 32 139 5 29 - 6 47 23 9 9 34 56 86 -9 138 56 34 - 6 50 12 139 14 24 - 6 44 33 138 19 46 - 7 1 46 139 50 44 - 6 32 58 138 23 13 - 5 38 49 9 10 24 56 87 -8 138 14 18 - 5 41 38 138 32 8 - 5 36 0 137 37 31 - 5 53 10 139 8 27 - 5 24 26 137 39 59 - 4 30 17 9 11 15 55 89 -8 137 31 3 - 4 33 5 137 48 53 - 4 27 28 136 54 15 - 4 44 35 138 25 13 - 4 15 56 136 55 42 - 3 21 44 9 12 5 55 91 -8 136 46 46 - 3 24 33 137 4 37 - 3 18 56 136 9 56 - 3 36 1 137 40 59 - 3 7 26 136 10 21 - 2 13 10 9 12 55 54 92 -7 136 1 24 - 2 15 58 136 19 16 - 2 10 22 135 24 30 - 2 27 25 136 55 42 - 1 58 53 135 23 50 - 1 4 32 9 13 46 54 94 -7 135 14 52 - 1 7 19 135 32 47 - 1 1 44 134 37 53 - 1 18 45 136 9 17 - 0 50 16 134 36 6 0 4 12 9 14 36 53 95 -6 134 27 6 0 1 25 134 45 5 0 7 0 133 50 1 - 0 10 0 135 21 41 0 18 27 133 47 4 1 13 3 9 15 27 52 97 -6 133 38 2 1 10 16 133 56 5 1 15 51 133 0 49 0 58 52 134 32 48 1 27 18 132 56 39 2 22 4 9 16 17 52 98 -5 132 47 35 2 19 17 133 5 42 2 24 51 132 10 12 2 7 53 133 42 35 2 36 17 132 4 45 3 31 15 9 17 7 51 99 -5 131 55 38 3 28 28 132 13 50 3 34 2 131 18 4 3 17 5 132 50 55 3 45 29 131 11 15 4 40 40 9 17 58 50 100 -4 131 2 5 4 37 53 131 20 24 4 43 27 130 24 17 4 26 30 131 57 41 4 54 53 130 16 3 5 50 19 9 18 48 49 102 -4 130 6 49 5 47 32 130 25 16 5 53 6 129 28 45 5 36 9 131 2 47 6 4 33 129 19 0 7 0 16 9 19 38 48 103 -3 129 9 42 6 57 29 129 28 16 7 3 3 128 31 20 6 46 5 130 6 5 7 14 30 128 19 56 8 10 32 9 20 29 47 104 -3 128 10 33 8 7 45 128 29 18 8 13 19 127 31 51 7 56 21 129 7 26 8 24 47 127 18 42 9 21 10 9 21 19 46 104 -2 127 9 14 9 18 22 127 28 9 9 23 57 126 30 7 9 6 58 128 6 40 9 35 25 126 15 5 10 32 12 9 22 10 45 105 -1 126 5 30 10 29 24 126 24 39 10 34 59 125 25 58 10 17 59 127 3 34 10 46 28 125 8 52 11 43 41 9 23 0 44 106 0 124 59 10 11 40 53 125 18 32 11 46 29 124 19 7 11 29 27 125 57 56 11 57 59 Uncertainty in time = +/- 22 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 30778465 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 52 25.0368 DE: -03 10 57.065 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .042 ) * V mag [mag]: 11.1 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 328.2382250735 DE(deg): -3.1336658869 * Equation of equinoxes (radians) : 0.000063805038180 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (706) Hirundo approx. diameter [km]: 29 approx. diameter ["]: .029 distance from Earth [AU]: 1.39300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 746 number of rejected observations: 39 time covered by the observations: 1910 Oct 15 - 2008 Feb 16 1 sigma uncertainty ellipse (major, minor, PA): 0.049, 0.025, 53° remarks: * orbital elements for (706) Hirundo : Mean anomaly = 356.06688605 deg Arg. of pericenter = 29.77225884 deg Long. of node = 325.54256177 deg Inclination = 14.47641562 deg Eccentricity = 0.19604627 Semimajor axis = 2.72788948 AU Perihelion dist = 2.19309692 AU Mag: H = 10.93, G = 0.15 Epoch of elements : MJD 55113.37700000 TDT (2009 Oct 09.377) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 9 706 Hirundo 9h 3.7m UT 11.1 21 52 25.037- 3 10 57.06UCAC2 30778465 0.0 13.6 29 10.9 1.393 -0.249 8.79 174.0636 -3.185 40.90 -6.38 9.0614 -0.49178 -0.20857 -0.59457 1.39305 0.00393 0.00079 2000 355.328140200910 6.00000 29.772259325.542562 14.4764160.19604627 2.7278895 2.193096910.2 5.00.15 RATE 2.1875800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.048 66 3.05 0.059 0 54545.5020091009_778465 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 23:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org