IOTA/IOTA-ES occultation update for (1057) Wanda / UCAC2 22043913 event on 2008 Apr 03, 05:51 UT Visible from Brazil, Peru, Ecuador Summary ------- On 2008 Apr 03 UT, the 41 km diameter asteroid (1057) Wanda will occult a 11.1 mag star in the constellation Ophiuchus for observers along a path across Brazil, Peru, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 16.5 mag (the magnitude of the asteroid) for at most 10.5 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: 27 * date and approx. time of event: 2008 Apr 03, 05:24 - 2008 Apr 03, 06:03 UT * midpoint of event [JD]: 2454559.74419583 * magnitude of target star: 11.1 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 10.5 * Moon: 11 % sunlit, 76° distance * Sun: 114° distance * rough path description: Brazil, Peru, Ecuador The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 2.50 * 1 sigma uncertainty interval [seconds]: +/- 26.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .052", 90° ) * approx speed of asteroid's shadow [km/s]: 3.8743 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 22043913 by 1057 Wanda on 2008 Apr 3 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 -100 0 0 7 50 26 5 24 42 1 115 -66 7 38 6 8 2 46 6 36 32 9 4 34 - 99 0 0 7 23 13 5 24 43 2 115 -67 7 10 53 7 35 33 6 9 19 8 37 20 - 98 0 0 6 56 0 5 24 44 3 115 -68 6 43 40 7 8 20 5 42 7 8 10 7 - 97 0 0 6 28 47 5 24 46 4 115 -70 6 16 28 6 41 7 5 14 56 7 42 53 - 96 0 0 6 1 37 5 24 49 5 115 -71 5 49 17 6 13 56 4 47 47 7 15 41 - 95 0 0 5 34 28 5 24 52 6 115 -72 5 22 9 5 46 48 4 20 40 6 48 31 - 94 0 0 5 7 23 5 24 56 8 115 -73 4 55 4 5 19 42 3 53 36 6 21 23 - 93 0 0 4 40 21 5 25 0 9 115 -74 4 28 3 4 52 40 3 26 37 5 54 19 - 92 0 0 4 13 23 5 25 6 10 115 -75 4 1 6 4 25 42 2 59 42 5 27 20 - 91 0 0 3 46 31 5 25 11 11 116 -76 3 34 14 3 58 49 2 32 52 5 0 25 - 90 0 0 3 19 45 5 25 18 12 116 -77 3 7 28 3 32 3 2 6 9 4 33 36 - 89 0 0 2 53 6 5 25 25 13 116 -78 2 40 49 3 5 23 1 39 33 4 6 53 - 88 0 0 2 26 34 5 25 33 14 116 -79 2 14 18 2 38 50 1 13 5 3 40 18 - 87 0 0 2 0 11 5 25 41 15 116 -80 1 47 55 2 12 26 0 46 45 3 13 50 - 86 0 0 1 33 56 5 25 50 16 116 -81 1 21 42 1 46 11 0 20 35 2 47 32 - 85 0 0 1 7 52 5 26 0 18 116 -82 0 55 38 1 20 6 - 0 5 25 2 21 23 - 84 0 0 0 41 58 5 26 10 19 116 -83 0 29 45 0 54 11 - 0 31 15 1 55 24 - 83 0 0 0 16 15 5 26 21 20 116 -84 0 4 3 0 28 28 - 0 56 52 1 29 37 - 82 0 0 - 0 9 15 5 26 32 21 116 -85 - 0 21 27 0 2 56 - 1 22 18 1 4 1 - 81 0 0 - 0 34 33 5 26 44 22 116 -85 - 0 46 43 - 0 22 22 - 1 47 30 0 38 39 - 80 0 0 - 0 59 37 5 26 57 23 116 -85 - 1 11 46 - 0 47 27 - 2 12 28 0 13 29 - 79 0 0 - 1 24 26 5 27 10 24 116 -85 - 1 36 35 - 1 12 17 - 2 37 12 - 0 11 26 - 78 0 0 - 1 49 1 5 27 24 25 116 -85 - 2 1 8 - 1 36 53 - 3 1 40 - 0 36 6 - 77 0 0 - 2 13 19 5 27 39 27 116 -85 - 2 25 26 - 2 1 12 - 3 25 53 - 1 0 31 - 76 0 0 - 2 37 21 5 27 54 28 116 -84 - 2 49 27 - 2 25 15 - 3 49 48 - 1 24 39 - 75 0 0 - 3 1 6 5 28 10 29 116 -83 - 3 13 10 - 2 49 1 - 4 13 27 - 1 48 31 - 74 0 0 - 3 24 33 5 28 26 30 116 -82 - 3 36 36 - 3 12 29 - 4 36 47 - 2 12 4 - 73 0 0 - 3 47 41 5 28 43 31 116 -82 - 3 59 43 - 3 35 39 - 4 59 48 - 2 35 19 - 72 0 0 - 4 10 30 5 29 0 32 116 -81 - 4 22 31 - 3 58 29 - 5 22 30 - 2 58 15 - 71 0 0 - 4 32 59 5 29 18 33 116 -80 - 4 44 59 - 4 20 59 - 5 44 52 - 3 20 51 - 70 0 0 - 4 55 8 5 29 36 34 116 -78 - 5 7 6 - 4 43 9 - 6 6 53 - 3 43 7 - 69 0 0 - 5 16 55 5 29 55 36 116 -77 - 5 28 52 - 5 4 57 - 6 28 33 - 4 5 2 - 68 0 0 - 5 38 20 5 30 15 37 116 -76 - 5 50 17 - 5 26 24 - 6 49 51 - 4 26 35 - 67 0 0 - 5 59 24 5 30 35 38 116 -75 - 6 11 19 - 5 47 28 - 7 10 47 - 4 47 45 - 66 0 0 - 6 20 4 5 30 56 39 116 -74 - 6 31 58 - 6 8 10 - 7 31 20 - 5 8 33 - 65 0 0 - 6 40 21 5 31 17 40 116 -73 - 6 52 13 - 6 28 28 - 7 51 29 - 5 28 58 - 64 0 0 - 7 0 14 5 31 38 41 116 -72 - 7 12 5 - 6 48 22 - 8 11 14 - 5 48 58 - 63 0 0 - 7 19 42 5 32 0 42 116 -71 - 7 31 32 - 7 7 52 - 8 30 35 - 6 8 35 - 62 0 0 - 7 38 45 5 32 23 43 116 -70 - 7 50 34 - 7 26 57 - 8 49 30 - 6 27 46 - 61 0 0 - 7 57 23 5 32 45 45 116 -69 - 8 9 11 - 7 45 36 - 9 8 0 - 6 46 31 - 60 0 0 - 8 15 35 5 33 9 46 116 -68 - 8 27 21 - 8 3 49 - 9 26 5 - 7 4 51 - 59 0 0 - 8 33 21 5 33 33 47 116 -66 - 8 45 6 - 8 21 36 - 9 43 43 - 7 22 44 - 58 0 0 - 8 50 40 5 33 57 48 117 -65 - 9 2 23 - 8 38 56 -10 0 54 - 7 40 11 - 57 0 0 - 9 7 32 5 34 21 49 117 -64 - 9 19 14 - 8 55 49 -10 17 38 - 7 57 10 - 56 0 0 - 9 23 56 5 34 46 50 117 -63 - 9 35 36 - 9 12 14 -10 33 54 - 8 13 42 - 55 0 0 - 9 39 52 5 35 11 51 117 -62 - 9 51 31 - 9 28 12 -10 49 43 - 8 29 45 - 54 0 0 - 9 55 20 5 35 37 52 117 -61 -10 6 58 - 9 43 41 -11 5 3 - 8 45 20 - 53 0 0 -10 10 19 5 36 3 53 117 -60 -10 21 56 - 9 58 41 -11 19 55 - 9 0 27 - 52 0 0 -10 24 49 5 36 30 54 117 -59 -10 36 25 -10 13 13 -11 34 19 - 9 15 4 - 51 0 0 -10 38 50 5 36 56 55 118 -58 -10 50 25 -10 27 15 -11 48 13 - 9 29 12 - 50 0 0 -10 52 21 5 37 23 57 118 -56 -11 3 55 -10 40 47 -12 1 37 - 9 42 50 - 49 0 0 -11 5 23 5 37 51 58 118 -55 -11 16 55 -10 53 50 -12 14 32 - 9 55 58 - 48 0 0 -11 17 54 5 38 18 59 119 -54 -11 29 26 -11 6 23 -12 26 57 -10 8 36 - 47 0 0 -11 29 56 5 38 46 60 119 -53 -11 41 26 -11 18 25 -12 38 52 -10 20 44 - 46 0 0 -11 41 26 5 39 14 61 119 -52 -11 52 56 -11 29 56 -12 50 17 -10 32 20 - 45 0 0 -11 52 26 5 39 43 62 120 -51 -12 3 55 -11 40 57 -13 1 11 -10 43 26 - 44 0 0 -12 2 55 5 40 12 63 120 -50 -12 14 23 -11 51 27 -13 11 34 -10 54 1 - 43 0 0 -12 12 53 5 40 41 64 121 -49 -12 24 19 -12 1 26 -13 21 26 -11 4 4 - 42 0 0 -12 22 19 5 41 10 65 122 -48 -12 33 45 -12 10 53 -13 30 48 -11 13 36 - 41 0 0 -12 31 14 5 41 39 66 122 -46 -12 42 39 -12 19 49 -13 39 38 -11 22 35 - 40 0 0 -12 39 38 5 42 9 67 123 -45 -12 51 2 -12 28 13 -13 47 56 -11 31 3 - 39 0 0 -12 47 29 5 42 39 68 124 -44 -12 58 52 -12 36 5 -13 55 44 -11 38 59 - 38 0 0 -12 54 49 5 43 8 69 125 -43 -13 6 11 -12 43 25 -14 2 59 -11 46 23 - 37 0 0 -13 1 36 5 43 39 70 126 -42 -13 12 58 -12 50 14 -14 9 43 -11 53 14 - 36 0 0 -13 7 51 5 44 9 71 128 -41 -13 19 13 -12 56 29 -14 15 54 -11 59 33 - 35 0 0 -13 13 34 5 44 39 72 129 -40 -13 24 55 -13 2 13 -14 21 34 -12 5 19 - 34 0 0 -13 18 45 5 45 10 73 131 -39 -13 30 6 -13 7 24 -14 26 42 -12 10 33 - 33 0 0 -13 23 23 5 45 41 73 133 -38 -13 34 43 -13 12 3 -14 31 17 -12 15 14 - 32 0 0 -13 27 29 5 46 12 74 135 -37 -13 38 49 -13 16 9 -14 35 21 -12 19 22 - 31 0 0 -13 31 2 5 46 43 75 138 -35 -13 42 21 -13 19 42 -14 38 52 -12 22 57 - 30 0 0 -13 34 3 5 47 14 76 141 -34 -13 45 22 -13 22 43 -14 41 51 -12 25 59 - 29 0 0 -13 36 30 5 47 45 76 144 -33 -13 47 49 -13 25 11 -14 44 17 -12 28 28 - 28 0 0 -13 38 25 5 48 16 77 147 -32 -13 49 44 -13 27 6 -14 46 11 -12 30 24 - 27 0 0 -13 39 47 5 48 48 78 151 -31 -13 51 6 -13 28 28 -14 47 32 -12 31 47 - 26 0 0 -13 40 36 5 49 19 78 156 -30 -13 51 55 -13 29 18 -14 48 21 -12 32 37 - 25 0 0 -13 40 53 5 49 51 79 160 -29 -13 52 11 -13 29 34 -14 48 37 -12 32 53 - 24 0 0 -13 40 36 5 50 22 79 165 -28 -13 51 55 -13 29 17 -14 48 21 -12 32 37 - 23 0 0 -13 39 47 5 50 54 79 171 -27 -13 51 5 -13 28 28 -14 47 32 -12 31 46 - 22 0 0 -13 38 24 5 51 25 79 176 -26 -13 49 43 -13 27 5 -14 46 10 -12 30 23 - 21 0 0 -13 36 29 5 51 57 79 182 -24 -13 47 48 -13 25 10 -14 44 16 -12 28 27 - 20 0 0 -13 34 1 5 52 29 79 187 -23 -13 45 20 -13 22 41 -14 41 49 -12 25 57 - 19 0 0 -13 31 0 5 53 0 79 193 -22 -13 42 19 -13 19 40 -14 38 50 -12 22 54 - 18 0 0 -13 27 26 5 53 32 79 198 -21 -13 38 45 -13 16 5 -14 35 18 -12 19 18 - 17 0 0 -13 23 19 5 54 4 78 202 -20 -13 34 39 -13 11 58 -14 31 14 -12 15 8 - 16 0 0 -13 18 39 5 54 35 78 207 -19 -13 30 0 -13 7 18 -14 26 37 -12 10 26 - 15 0 0 -13 13 26 5 55 7 77 210 -18 -13 24 48 -13 2 5 -14 21 27 -12 5 10 - 14 0 0 -13 7 41 5 55 38 76 214 -17 -13 19 3 -12 56 19 -14 15 46 -11 59 22 - 13 0 0 -13 1 23 5 56 10 76 217 -16 -13 12 46 -12 50 1 -14 9 31 -11 53 0 - 12 0 0 -12 54 33 5 56 41 75 220 -14 -13 5 56 -12 43 10 -14 2 45 -11 46 6 - 11 0 0 -12 47 10 5 57 12 74 222 -13 -12 58 34 -12 35 46 -13 55 26 -11 38 38 - 10 0 0 -12 39 15 5 57 43 73 224 -12 -12 50 39 -12 27 50 -13 47 36 -11 30 38 - 9 0 0 -12 30 47 5 58 14 72 226 -11 -12 42 13 -12 19 21 -13 39 13 -11 22 6 - 8 0 0 -12 21 47 5 58 45 71 228 -10 -12 33 14 -12 10 21 -13 30 18 -11 13 1 - 7 0 0 -12 12 16 5 59 16 70 230 -9 -12 23 43 -12 0 48 -13 20 52 -11 3 24 - 6 0 0 -12 2 12 5 59 47 69 231 -8 -12 13 40 -11 50 43 -13 10 54 -10 53 14 - 5 0 0 -11 51 36 6 0 17 69 232 -7 -12 3 5 -11 40 7 -13 0 24 -10 42 33 - 4 0 0 -11 40 29 6 0 48 68 233 -6 -11 51 59 -11 28 59 -12 49 23 -10 31 20 - 3 0 0 -11 28 50 6 1 18 67 234 -4 -11 40 22 -11 17 19 -12 37 51 -10 19 35 - 2 0 0 -11 16 41 6 1 48 66 235 -3 -11 28 13 -11 5 8 -12 25 47 -10 7 18 - 1 0 0 -11 4 0 6 2 18 64 236 -2 -11 15 33 -10 52 26 -12 13 13 - 9 54 31 0 0 0 -10 50 48 6 2 47 63 236 -1 -11 2 23 -10 39 13 -12 0 8 - 9 41 12 1 0 0 -10 37 6 6 3 17 62 237 0 -10 48 41 -10 25 30 -11 46 33 - 9 27 23 Uncertainty in time = +/- 29 secs [Prediction of 2008 Mar 7.0] Data for the target star ------------------------ * name: UCAC2 22043913 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 13 40.3487 DE: -24 11 16.113 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .046, .046 ) * V mag [mag]: 11.1 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 258.5491741665 DE(deg): -24.1994773007 * Equation of equinoxes (radians) : 0.000041028350887 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1057) Wanda approx. diameter [km]: 41 approx. diameter ["]: .021 distance from Earth [AU]: 2.66200 * orbital information: orbit source: Preston date of fit: 2008 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 870 number of rejected observations: 69 time covered by the observations: 1925 Aug 19 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.026, 91° remarks: * orbital elements for (1057) Wanda : Mean anomaly = 257.01036131 deg Arg. of pericenter = 112.12005586 deg Long. of node = 258.93605810 deg Inclination = 3.52276870 deg Eccentricity = 0.24911686 Semimajor axis = 2.89157313 AU Perihelion dist = 2.17123351 AU Mag: H = 10.85, G = 0.15 Epoch of elements : MJD 54559.24400000 TDT (2008 Apr 03.244) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 1057 Wanda 5h 51.6m UT 11.1 17 13 40.349-24 11 16.11UCAC2 22043913 0.0 16.5 41 10.5 2.662 0.527 0.22 -21.4301 -24.188 92.91 5.47 5.8607 -0.00490 0.18493 2.18582 0.06513 -0.00534 0.00048 2000 255.1574152008 325.00000112.120056258.936058 3.5227690.24911686 2.8915731 2.171233511.0 5.00.15 RATE 2.0044850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.052 90 3.50 0.052 0 54532.5020080403_043913 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 13:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org