IOTA/IOTA-ES occultation update for (1166) Sakuntala / 2UCAC 20487543 event on 2007 Aug 01, 22:54 UT Visible from Africa Summary ------- On 2007 Aug 01 UT, the 29 km diameter asteroid (1166) Sakuntala will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 11.3 mag (the magnitude of the asteroid) for at most 3.7 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: 42 * date and approx. time of event: 2007 Aug 01, 22:40 - 2007 Aug 01, 23:07 UT * midpoint of event [JD]: 2454314.4542375 * magnitude of target star: 11.5 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 3.7 * Moon: 89 % sunlit, 68° distance * Sun: 150° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 1.57 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .049", 98° ) * approx speed of asteroid's shadow [km/s]: 7.9116 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 20487543 by 1166 Sakuntala on 2007 Aug 01 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 46 2 24 47 0 0 22 40 46 0 227 -22 45 45 31 ... .. .. 44 52 56 ... .. .. 44 30 12 46 0 0 22 40 46 2 226 -23 44 13 59 44 46 29 43 23 29 45 38 0 43 3 20 45 0 0 22 40 47 3 225 -24 42 47 43 43 19 0 41 59 3 44 8 33 41 41 11 44 0 0 22 40 48 4 224 -25 41 26 7 41 56 18 40 39 6 42 44 7 40 23 15 43 0 0 22 40 50 6 223 -27 40 8 40 40 37 53 39 23 9 41 24 7 39 9 7 42 0 0 22 40 52 7 223 -28 38 54 59 39 23 19 38 10 49 40 8 7 37 58 25 41 0 0 22 40 55 8 222 -29 37 44 40 38 12 11 37 1 44 38 55 42 36 50 48 40 0 0 22 40 57 10 221 -30 36 37 25 37 4 13 35 55 37 37 46 32 35 46 1 39 0 0 22 41 1 11 220 -32 35 32 58 35 59 5 34 52 12 36 40 19 34 43 48 38 0 0 22 41 4 12 220 -33 34 31 4 34 56 33 33 51 15 35 36 48 33 43 57 37 0 0 22 41 8 14 219 -34 33 31 30 33 56 25 32 52 35 34 35 44 32 46 16 36 0 0 22 41 13 15 219 -35 32 34 5 32 58 28 31 55 59 33 36 56 31 50 35 35 0 0 22 41 17 16 218 -36 31 38 39 32 2 32 31 1 18 32 40 13 30 56 45 34 0 0 22 41 22 17 218 -37 30 45 2 31 8 28 30 8 24 31 45 25 30 4 37 33 0 0 22 41 27 18 217 -39 29 53 7 30 16 7 29 17 8 30 52 23 29 14 3 32 0 0 22 41 33 20 217 -40 29 2 45 29 25 22 28 27 23 30 1 0 28 24 58 31 0 0 22 41 39 21 216 -41 28 13 51 28 36 6 27 39 4 29 11 8 27 37 15 30 0 0 22 41 45 22 216 -42 27 26 18 27 48 12 26 52 3 28 22 41 26 50 47 29 0 0 22 41 51 23 216 -43 26 40 1 27 1 35 26 6 16 27 35 32 26 5 31 28 0 0 22 41 58 24 215 -44 25 54 53 26 16 9 25 21 37 26 49 38 25 21 21 27 0 0 22 42 5 26 215 -45 25 10 52 25 31 50 24 38 2 26 4 51 24 38 12 26 0 0 22 42 13 27 215 -46 24 27 51 24 48 34 23 55 26 25 21 9 23 56 2 25 0 0 22 42 20 28 214 -47 23 45 48 24 6 16 23 13 47 24 38 27 23 14 45 24 0 0 22 42 28 29 214 -48 23 4 39 23 24 52 22 32 59 23 56 41 22 34 19 23 0 0 22 42 36 30 214 -49 22 24 19 22 44 19 21 53 0 23 15 47 21 54 40 22 0 0 22 42 44 31 214 -50 21 44 46 22 4 34 21 13 47 22 35 42 21 15 45 21 0 0 22 42 53 33 214 -51 21 5 58 21 25 33 20 35 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0 22 45 28 49 213 -65 12 25 29 12 43 22 11 57 27 13 11 28 12 2 28 5 0 0 22 45 40 50 213 -66 11 53 33 12 11 22 11 25 35 12 39 23 11 30 42 4 0 0 22 45 52 52 213 -67 11 21 49 11 39 36 10 53 55 12 7 33 10 59 8 3 0 0 22 46 5 53 214 -67 10 50 16 11 8 1 10 22 25 11 35 54 10 27 45 2 0 0 22 46 17 54 214 -68 10 18 53 10 36 36 9 51 5 11 4 27 9 56 30 1 0 0 22 46 30 55 214 -69 9 47 39 10 5 21 9 19 53 10 33 9 9 25 23 0 0 0 22 46 42 56 214 -69 9 16 33 9 34 14 8 48 48 10 2 1 8 54 24 - 1 0 0 22 46 55 57 215 -70 8 45 34 9 3 14 8 17 50 9 31 0 Latitude Latitude Latitude Latitude 7 0 0 - 4 42 49 22 47 45 61 216 -72 - 4 25 33 - 5 0 7 - 3 31 24 - 5 54 33 6 0 0 - 6 40 9 22 48 11 63 217 -73 - 6 22 48 - 6 57 30 - 5 28 28 - 7 52 8 5 0 0 - 8 37 27 22 48 38 65 218 -73 - 8 20 4 - 8 54 52 - 7 25 35 - 9 49 39 4 0 0 -10 34 30 22 49 6 67 219 -73 -10 17 5 -10 51 57 - 9 22 29 -11 46 52 3 0 0 -12 31 2 22 49 34 69 221 -73 -12 13 35 -12 48 30 -11 18 56 -13 43 30 2 0 0 -14 26 49 22 50 2 71 223 -73 -14 9 22 -14 44 18 -13 14 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73 -16 -70 52 37 -71 8 42 -70 27 22 -71 33 59 - 79 0 0 -71 4 53 23 5 1 35 74 -15 -70 56 52 -71 12 54 -70 31 42 -71 38 5 - 80 0 0 -71 8 46 23 5 4 34 75 -15 -71 0 47 -71 16 46 -70 35 42 -71 41 53 - 81 0 0 -71 12 21 23 5 6 34 76 -15 -71 4 23 -71 20 19 -70 39 22 -71 45 21 - 82 0 0 -71 15 36 23 5 9 34 77 -15 -71 7 39 -71 23 33 -70 42 42 -71 48 31 - 83 0 0 -71 18 32 23 5 11 33 78 -14 -71 10 36 -71 26 28 -70 45 43 -71 51 23 - 84 0 0 -71 21 10 23 5 14 33 79 -14 -71 13 15 -71 29 4 -70 48 25 -71 53 56 - 85 0 0 -71 23 28 23 5 16 33 79 -14 -71 15 35 -71 31 22 -70 50 48 -71 56 11 - 86 0 0 -71 25 29 23 5 19 32 80 -13 -71 17 36 -71 33 22 -70 52 52 -71 58 8 - 87 0 0 -71 27 11 23 5 21 32 81 -13 -71 19 19 -71 35 4 -70 54 37 -71 59 48 - 88 0 0 -71 28 35 23 5 23 32 82 -13 -71 20 44 -71 36 27 -70 56 3 -72 1 10 - 89 0 0 -71 29 42 23 5 26 31 83 -12 -71 21 50 -71 37 33 -70 57 11 -72 2 14 - 90 0 0 -71 30 30 23 5 28 31 84 -12 -71 22 39 -71 38 21 -70 58 1 -72 3 1 - 91 0 0 -71 31 0 23 5 30 31 85 -12 -71 23 9 -71 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13 -105 0 0 -71 6 23 23 6 1 26 98 -8 -70 58 23 -71 14 23 -70 33 16 -71 39 32 -106 0 0 -71 2 16 23 6 3 26 99 -7 -70 54 15 -71 10 18 -70 29 3 -71 35 32 -107 0 0 -70 57 50 23 6 5 26 100 -7 -70 49 46 -71 5 53 -70 24 29 -71 31 12 -108 0 0 -70 53 3 23 6 7 25 101 -7 -70 44 57 -71 1 8 -70 19 34 -71 26 33 -109 0 0 -70 47 55 23 6 9 25 102 -7 -70 39 47 -70 56 2 -70 14 18 -71 21 33 -110 0 0 -70 42 25 23 6 11 25 103 -6 -70 34 16 -70 50 35 -70 8 41 -71 16 12 -111 0 0 -70 36 35 23 6 13 24 104 -6 -70 28 23 -70 44 46 -70 2 41 -71 10 31 -112 0 0 -70 30 22 23 6 15 24 105 -6 -70 22 8 -70 38 36 -69 56 18 -71 4 28 -113 0 0 -70 23 46 23 6 17 24 106 -5 -70 15 30 -70 32 3 -69 49 32 -70 58 3 -114 0 0 -70 16 47 23 6 19 23 107 -5 -70 8 28 -70 25 7 -69 42 22 -70 51 15 -115 0 0 -70 9 25 23 6 21 23 108 -5 -70 1 3 -70 17 47 -69 34 48 -70 44 4 -116 0 0 -70 1 38 23 6 23 23 109 -4 -69 53 13 -70 10 3 -69 26 49 -70 36 30 -117 0 0 -69 53 26 23 6 25 22 110 -4 -69 44 59 -70 1 55 -69 18 25 -70 28 31 -118 0 0 -69 44 49 23 6 27 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24 -66 27 35 -67 46 16 -132 0 0 -66 50 33 23 6 54 16 124 2 -66 40 57 -67 0 9 -66 10 50 -67 30 20 -133 0 0 -66 33 29 23 6 56 15 125 2 -66 23 47 -66 43 12 -65 53 20 -67 13 42 -134 0 0 -66 15 40 23 6 58 15 125 3 -66 5 52 -66 25 29 -65 35 5 -66 56 20 -135 0 0 -65 57 4 23 7 0 14 126 3 -65 47 9 -66 7 0 -65 16 1 -66 38 12 -136 0 0 -65 37 39 23 7 1 14 127 4 -65 27 37 -65 47 42 -64 56 7 -66 19 16 -137 0 0 -65 17 23 23 7 3 13 128 4 -65 7 14 -65 27 33 -64 35 21 -65 59 29 -138 0 0 -64 56 13 23 7 5 13 129 5 -64 45 56 -65 6 31 -64 13 40 -65 38 51 -139 0 0 -64 34 8 23 7 7 12 130 5 -64 23 43 -64 44 33 -63 51 2 -65 17 18 -140 0 0 -64 11 3 23 7 8 12 131 6 -64 0 30 -64 21 36 -63 27 24 -64 54 47 -141 0 0 -63 46 57 23 7 10 11 132 6 -63 36 16 -63 57 39 -63 2 43 -64 31 16 -142 0 0 -63 21 47 23 7 12 10 133 7 -63 10 56 -63 32 37 -62 36 56 -64 6 42 -143 0 0 -62 55 29 23 7 13 10 134 7 -62 44 29 -63 6 28 -62 10 1 -63 41 2 -144 0 0 -62 28 0 23 7 15 9 134 8 -62 16 51 -62 39 9 -61 41 53 -63 14 12 -145 0 0 -61 59 17 23 7 16 9 135 9 -61 47 58 -62 10 35 -61 12 29 -62 46 10 -146 0 0 -61 29 15 23 7 18 8 136 9 -61 17 46 -61 40 44 -60 41 45 -62 16 50 -147 0 0 -60 57 51 23 7 19 7 137 10 -60 46 12 -61 9 31 -60 9 38 -61 46 10 -148 0 0 -60 25 1 23 7 20 6 138 11 -60 13 10 -60 36 51 -59 36 2 -61 14 5 -149 0 0 -59 50 39 23 7 21 6 139 11 -59 38 37 -60 2 41 -59 0 53 -60 40 31 -150 0 0 -59 14 41 23 7 23 5 140 12 -59 2 28 -59 26 55 -58 24 7 -60 5 22 -151 0 0 -58 37 3 23 7 23 4 140 13 -58 24 37 -58 49 29 -57 45 38 -59 28 34 -152 0 0 -57 57 38 23 7 24 3 141 13 -57 44 59 -58 10 17 -57 5 20 -58 50 2 -153 0 0 -57 16 20 23 7 25 2 142 14 -57 3 29 -57 29 12 -56 23 9 -58 9 39 -154 0 0 -56 33 4 23 7 25 1 143 15 -56 19 59 -56 46 10 -55 38 57 -57 27 19 -155 0 0 -55 47 44 23 7 26 0 144 16 -55 34 24 -56 1 3 .. .. .. -56 42 57 -156 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -55 56 25 Data for the target star ------------------------ * name: 2UCAC 20487543 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 40 54.2546 DE: -27 35 54.606 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .045, .045 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 280.3529179299 DE(deg): -27.5930121853 * Equation of equinoxes (radians) : 0.000033173629786 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1166) Sakuntala approx. diameter [km]: 29 approx. diameter ["]: .037 distance from Earth [AU]: 1.06900 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 580 number of rejected observations: 30 time covered by the observations: 1930 Jun 30 - 2007 Jun 05 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.019, 108° remarks: * orbital elements for (1166) Sakuntala : Mean anomaly = 358.84948977 deg Arg. of pericenter = 189.16216385 deg Long. of node = 106.78801741 deg Inclination = 18.89349880 deg Eccentricity = 0.20714369 Semimajor axis = 2.53663424 AU Perihelion dist = 2.01118646 AU Mag: H = 10.30, G = 0.15 Epoch of elements : MJD 54313.95400000 TDT (2007 Aug 01.954) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 1166 Sakuntala 22h 54.1m UT 11.5 18 40 54.255-27 35 54.612UCAC 20487543 0.0 11.3 29 3.7 1.069 -1.309 -32.31 -13.465 -27.590 -161.94 17.92 22.9017 .09571 -.05177 -2.11872 -3.93092 0.00249 0.00052 2000 357.8848752007 729.00000189.162164106.788017 18.8934990.207143692.536634242.011186468.8 5 0.15 RATE 2.4395927 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.060 0.049 98.0 2.570 0.059 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 08, 22:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org