IOTA/IOTA-ES occultation update for (1115) Sabauda / UCAC2 26365837 event on 2009 Oct 03, 02:41 UT Visible from Summary ------- On 2009 Oct 03 UT, the 69 km diameter asteroid (1115) Sabauda will occult a 11.3 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 4.8 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: 56 * date and approx. time of event: 2009 Oct 03, 02:35 - 2009 Oct 03, 02:47 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 4.8 * Moon: 98 % sunlit, 27° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 1.11 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .046", 76° ) * approx speed of asteroid's shadow [km/s]: 14.2994 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26365837 by 1115 Sabauda on 2009 Oct 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 -122 0 0 21 8 7 2 47 12 0 106 -13 21 32 53 20 43 30 .. .. .. .. .. .. -121 0 0 20 52 48 2 47 12 1 106 -14 21 17 31 20 28 14 22 12 55 .. .. .. -120 0 0 20 37 53 2 47 12 2 106 -15 21 2 33 20 13 22 21 57 50 .. .. .. -119 0 0 20 23 22 2 47 12 3 107 -16 20 47 59 19 58 54 21 43 10 .. .. .. -118 0 0 20 9 16 2 47 11 4 107 -17 20 33 51 19 44 51 21 28 54 .. .. .. -117 0 0 19 55 35 2 47 10 5 107 -18 20 20 6 19 31 12 21 15 4 .. .. .. -116 0 0 19 42 19 2 47 9 6 108 -19 20 6 48 19 17 58 21 1 39 18 24 25 -115 0 0 19 29 28 2 47 8 7 108 -20 19 53 54 19 5 10 20 48 39 18 11 42 -114 0 0 19 17 2 2 47 7 8 108 -21 19 41 26 18 52 47 20 36 5 17 59 24 -113 0 0 19 5 2 2 47 6 9 109 -22 19 29 23 18 40 49 20 23 56 17 47 32 -112 0 0 18 53 27 2 47 4 10 109 -23 19 17 46 18 29 17 20 12 14 17 36 5 -111 0 0 18 42 19 2 47 2 11 109 -23 19 6 35 18 18 11 20 0 58 17 25 4 -110 0 0 18 31 36 2 47 0 12 110 -24 18 55 50 18 7 30 19 50 8 17 14 28 -109 0 0 18 21 20 2 46 58 13 110 -25 18 45 31 17 57 16 19 39 44 17 4 19 -108 0 0 18 11 29 2 46 56 14 111 -26 18 35 39 17 47 28 19 29 46 16 54 35 -107 0 0 18 2 5 2 46 54 15 111 -27 18 26 13 17 38 6 19 20 16 16 45 17 -106 0 0 17 53 8 2 46 51 16 111 -28 18 17 13 17 29 10 19 11 12 16 36 26 -105 0 0 17 44 37 2 46 49 17 112 -29 18 8 40 17 20 41 19 2 35 16 28 0 -104 0 0 17 36 32 2 46 46 17 112 -30 18 0 34 17 12 38 18 54 24 16 20 1 -103 0 0 17 28 54 2 46 43 18 112 -31 17 52 54 17 5 2 18 46 41 16 12 29 -102 0 0 17 21 43 2 46 40 19 113 -32 17 45 42 16 57 52 18 39 24 16 5 22 -101 0 0 17 14 59 2 46 37 20 113 -33 17 38 56 16 51 9 18 32 35 15 58 43 -100 0 0 17 8 41 2 46 34 21 113 -34 17 32 37 16 44 53 18 26 13 15 52 30 - 99 0 0 17 2 50 2 46 30 22 114 -35 17 26 45 16 39 4 18 20 18 15 46 43 - 98 0 0 16 57 27 2 46 27 23 114 -36 17 21 20 16 33 41 18 14 50 15 41 23 - 97 0 0 16 52 30 2 46 23 24 115 -37 17 16 22 16 28 45 18 9 49 15 36 30 - 96 0 0 16 48 0 2 46 19 25 115 -38 17 11 51 16 24 17 18 5 16 15 32 3 - 95 0 0 16 43 57 2 46 15 26 116 -39 17 7 47 16 20 15 18 1 9 15 28 4 - 94 0 0 16 40 21 2 46 11 26 116 -40 17 4 10 16 16 39 17 57 30 15 24 30 - 93 0 0 16 37 12 2 46 7 27 117 -41 17 1 0 16 13 31 17 54 19 15 21 24 - 92 0 0 16 34 30 2 46 3 28 117 -41 16 58 17 16 10 50 17 51 35 15 18 44 - 91 0 0 16 32 15 2 45 58 29 118 -42 16 56 2 16 8 36 17 49 17 15 16 31 - 90 0 0 16 30 27 2 45 54 30 118 -43 16 54 13 16 6 48 17 47 28 15 14 45 - 89 0 0 16 29 6 2 45 49 31 119 -44 16 52 52 16 5 27 17 46 5 15 13 25 - 88 0 0 16 28 11 2 45 44 32 119 -45 16 51 57 16 4 33 17 45 10 15 12 32 - 87 0 0 16 27 44 2 45 39 32 120 -46 16 51 30 16 4 6 17 44 42 15 12 5 - 86 0 0 16 27 44 2 45 34 33 120 -47 16 51 29 16 4 6 17 44 41 15 12 5 - 85 0 0 16 28 10 2 45 29 34 121 -48 16 51 55 16 4 33 17 45 7 15 12 32 - 84 0 0 16 29 3 2 45 24 35 121 -49 16 52 49 16 5 26 17 46 0 15 13 25 - 83 0 0 16 30 23 2 45 19 36 122 -50 16 54 9 16 6 46 17 47 21 15 14 44 - 82 0 0 16 32 10 2 45 13 36 123 -51 16 55 55 16 8 32 17 49 8 15 16 30 - 81 0 0 16 34 23 2 45 8 37 123 -52 16 58 9 16 10 45 17 51 22 15 18 43 - 80 0 0 16 37 3 2 45 2 38 124 -52 17 0 49 16 13 24 17 54 3 15 21 21 - 79 0 0 16 40 9 2 44 56 39 125 -53 17 3 56 16 16 30 17 57 11 15 24 26 - 78 0 0 16 43 42 2 44 51 39 126 -54 17 7 29 16 20 3 18 0 46 15 27 57 - 77 0 0 16 47 41 2 44 45 40 126 -55 17 11 29 16 24 1 18 4 47 15 31 54 - 76 0 0 16 52 7 2 44 39 41 127 -56 17 15 55 16 28 26 18 9 15 15 36 17 - 75 0 0 16 56 58 2 44 33 41 128 -57 17 20 48 16 33 16 18 14 9 15 41 6 - 74 0 0 17 2 16 2 44 26 42 129 -58 17 26 6 16 38 33 18 19 30 15 46 21 - 73 0 0 17 8 0 2 44 20 43 130 -59 17 31 51 16 44 16 18 25 17 15 52 2 - 72 0 0 17 14 9 2 44 14 43 131 -59 17 38 2 16 50 25 18 31 30 15 58 8 - 71 0 0 17 20 45 2 44 8 44 132 -60 17 44 38 16 56 59 18 38 10 16 4 40 - 70 0 0 17 27 46 2 44 1 45 133 -61 17 51 41 17 3 59 18 45 15 16 11 37 - 69 0 0 17 35 12 2 43 55 45 134 -62 17 59 9 17 11 24 18 52 46 16 18 59 - 68 0 0 17 43 5 2 43 48 46 135 -63 18 7 2 17 19 15 19 0 43 16 26 47 - 67 0 0 17 51 22 2 43 41 46 136 -63 18 15 21 17 27 30 19 9 5 16 35 0 - 66 0 0 18 0 4 2 43 35 47 137 -64 18 24 5 17 36 11 19 17 53 16 43 37 - 65 0 0 18 9 12 2 43 28 47 138 -65 18 33 14 17 45 17 19 27 6 16 52 40 - 64 0 0 18 18 45 2 43 21 48 139 -65 18 42 49 17 54 48 19 36 44 17 2 7 - 63 0 0 18 28 42 2 43 14 48 140 -66 18 52 48 18 4 44 19 46 47 17 11 58 - 62 0 0 18 39 3 2 43 7 49 142 -67 19 3 11 18 15 3 19 57 15 17 22 14 - 61 0 0 18 49 50 2 43 0 49 143 -67 19 13 59 18 25 48 20 8 8 17 32 54 - 60 0 0 19 1 0 2 42 53 50 144 -68 19 25 12 18 36 56 20 19 25 17 43 58 - 59 0 0 19 12 34 2 42 46 50 146 -68 19 36 48 18 48 28 20 31 6 17 55 26 - 58 0 0 19 24 32 2 42 39 50 147 -69 19 48 49 19 0 24 20 43 11 18 7 17 - 57 0 0 19 36 54 2 42 32 51 148 -69 20 1 13 19 12 44 20 55 41 18 19 32 - 56 0 0 19 49 39 2 42 25 51 150 -70 20 14 0 19 25 27 21 8 33 18 32 10 - 55 0 0 20 2 48 2 42 18 51 151 -70 20 27 11 19 38 33 21 21 50 18 45 11 - 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24 0 0 29 34 34 2 38 38 45 196 -59 30 0 29 29 8 48 30 58 39 28 12 10 - 23 0 0 29 57 9 2 38 32 44 198 -58 30 23 8 29 31 21 31 21 25 28 34 37 - 22 0 0 30 19 55 2 38 26 43 199 -57 30 45 57 29 54 4 31 44 21 28 57 14 - 21 0 0 30 42 51 2 38 20 43 200 -57 31 8 55 30 16 56 32 7 26 29 20 0 - 20 0 0 31 5 55 2 38 13 42 201 -56 31 32 3 30 39 58 32 30 40 29 42 56 - 19 0 0 31 29 8 2 38 7 41 202 -55 31 55 19 31 3 8 32 54 2 30 6 0 - 18 0 0 31 52 29 2 38 2 41 203 -54 32 18 42 31 26 27 33 17 32 30 29 12 - 17 0 0 32 15 57 2 37 56 40 204 -53 32 42 13 31 49 52 33 41 9 30 52 32 - 16 0 0 32 39 32 2 37 50 39 205 -52 33 5 50 32 13 24 34 4 53 31 15 59 - 15 0 0 33 3 13 2 37 44 39 206 -51 33 29 34 32 37 2 34 28 42 31 39 31 - 14 0 0 33 26 59 2 37 39 38 207 -51 33 53 22 33 0 46 34 52 36 32 3 10 - 13 0 0 33 50 50 2 37 33 37 208 -50 34 17 15 33 24 34 35 16 35 32 26 53 - 12 0 0 34 14 45 2 37 28 36 209 -49 34 41 13 33 48 27 35 40 37 32 50 41 - 11 0 0 34 38 43 2 37 23 36 210 -48 35 5 13 34 12 23 36 4 43 33 14 33 - 10 0 0 35 2 44 2 37 18 35 211 -47 35 29 16 34 36 22 36 28 51 33 38 27 - 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 26365837 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 02 01.1524 DE: -14 31 59.284 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .042 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1115) Sabauda approx. diameter [km]: 69 approx. diameter ["]: .041 distance from Earth [AU]: 2.33400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 564 number of rejected observations: 71 time covered by the observations: 1928 Dec 18 - 2007 Sep 07 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.018, 61° remarks: * orbital elements for (1115) Sabauda : Mean anomaly = 257.41232178 deg Arg. of pericenter = 56.56253109 deg Long. of node = 71.76327036 deg Inclination = 15.26335355 deg Eccentricity = 0.16817479 Semimajor axis = 3.10260668 AU Perihelion dist = 2.58082646 AU Mag: H = 9.51, G = 0.15 Epoch of elements : MJD 55107.11200000 TDT (2009 Oct 03.112) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 3 1115 Sabauda 2h 41.3m UT 11.3 1 2 1.152-14 31 59.28UCAC2 26365837 0.0 14.2 69 4.8 2.334 -2.014 -8.33 -36.7728 -14.530 136.95 -3.98 2.6889 -0.16795 0.58855 -7.76134 -2.21421 -0.00064 0.00183 2000 256.1296792009 926.00000 56.562531 71.763270 15.2633540.16817479 3.1026067 2.5808265 9.3 5.00.15 RATE 1.8034910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.046 76 2.11 0.045 0 54545.5020091003_365837 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org