IOTA/IOTA-ES occultation update for (533) Sara / TYC 5771-01229-1 event on 2008 May 20, 21:27 UT Visible from SE Asia Summary ------- On 2008 May 20 UT, the 31 km diameter asteroid (533) Sara will occult a 9.7 mag star in the constellation Aquarius for observers along a path across SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.0 mag (the magnitude of the asteroid) for at most 3.1 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: 45 * date and approx. time of event: 2008 May 20, 21:18 - 2008 May 20, 21:30 UT * midpoint of event [JD]: 2454607.3942875 * magnitude of target star: 9.7 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 3.1 * Moon: 99 % sunlit, 69° distance * Sun: 103° distance * rough path description: SE Asia The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .024", 83° ) * approx speed of asteroid's shadow [km/s]: 10.1364 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5771-01229-1 by 533 Sara on 2008 May 20 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 29 0 0 - 4 9 21 21 18 7 0 99 -71 - 4 18 35 - 4 0 7 .. .. .. - 3 33 16 30 0 0 - 4 18 45 21 18 7 1 99 -72 - 4 27 58 - 4 9 31 .. .. .. - 3 42 42 31 0 0 - 4 27 36 21 18 7 2 99 -72 - 4 36 48 - 4 18 23 .. .. .. - 3 51 35 32 0 0 - 4 35 54 21 18 8 3 99 -73 - 4 45 6 - 4 26 42 - 5 11 43 - 3 59 56 33 0 0 - 4 43 41 21 18 9 4 99 -73 - 4 52 52 - 4 34 29 - 5 19 27 - 4 7 45 34 0 0 - 4 50 54 21 18 10 5 99 -74 - 5 0 5 - 4 41 43 - 5 26 39 - 4 15 0 35 0 0 - 4 57 35 21 18 11 6 99 -74 - 5 6 45 - 4 48 24 - 5 33 18 - 4 21 43 36 0 0 - 5 3 43 21 18 12 7 99 -74 - 5 12 53 - 4 54 33 - 5 39 24 - 4 27 53 37 0 0 - 5 9 18 21 18 14 8 99 -75 - 5 18 28 - 5 0 8 - 5 44 58 - 4 33 29 38 0 0 - 5 14 21 21 18 16 9 98 -75 - 5 23 30 - 5 5 11 - 5 49 59 - 4 38 33 39 0 0 - 5 18 50 21 18 18 10 98 -75 - 5 27 59 - 5 9 40 - 5 54 27 - 4 43 3 40 0 0 - 5 22 46 21 18 20 11 98 -75 - 5 31 54 - 5 13 36 - 5 58 22 - 4 47 0 41 0 0 - 5 26 8 21 18 23 12 98 -75 - 5 35 17 - 5 16 59 - 6 1 44 - 4 50 24 42 0 0 - 5 28 58 21 18 25 13 98 -75 - 5 38 6 - 5 19 49 - 6 4 32 - 4 53 13 43 0 0 - 5 31 14 21 18 28 14 98 -75 - 5 40 22 - 5 22 5 - 6 6 48 - 4 55 30 44 0 0 - 5 32 56 21 18 31 15 98 -75 - 5 42 4 - 5 23 47 - 6 8 30 - 4 57 12 45 0 0 - 5 34 5 21 18 34 16 98 -74 - 5 43 13 - 5 24 56 - 6 9 39 - 4 58 21 46 0 0 - 5 34 40 21 18 38 17 98 -74 - 5 43 48 - 5 25 31 - 6 10 14 - 4 58 56 47 0 0 - 5 34 41 21 18 42 18 98 -74 - 5 43 49 - 5 25 32 - 6 10 16 - 4 58 57 48 0 0 - 5 34 8 21 18 45 19 98 -73 - 5 43 17 - 5 24 59 - 6 9 44 - 4 58 24 49 0 0 - 5 33 2 21 18 50 20 98 -73 - 5 42 10 - 5 23 53 - 6 8 38 - 4 57 17 50 0 0 - 5 31 21 21 18 54 21 98 -72 - 5 40 30 - 5 22 12 - 6 6 58 - 4 55 35 51 0 0 - 5 29 7 21 18 58 22 98 -71 - 5 38 16 - 5 19 57 - 6 4 44 - 4 53 19 52 0 0 - 5 26 18 21 19 3 23 98 -71 - 5 35 27 - 5 17 8 - 6 1 57 - 4 50 29 53 0 0 - 5 22 54 21 19 8 24 98 -70 - 5 32 4 - 5 13 44 - 5 58 35 - 4 47 4 54 0 0 - 5 18 57 21 19 13 25 98 -69 - 5 28 7 - 5 9 46 - 5 54 39 - 4 43 5 55 0 0 - 5 14 25 21 19 18 26 98 -69 - 5 23 35 - 5 5 13 - 5 50 9 - 4 38 31 56 0 0 - 5 9 18 21 19 24 27 98 -68 - 5 18 29 - 5 0 6 - 5 45 4 - 4 33 22 57 0 0 - 5 3 37 21 19 30 28 98 -67 - 5 12 49 - 4 54 25 - 5 39 25 - 4 27 39 58 0 0 - 4 57 21 21 19 35 29 98 -66 - 5 6 33 - 4 48 8 - 5 33 12 - 4 21 21 59 0 0 - 4 50 31 21 19 41 30 98 -65 - 4 59 44 - 4 41 17 - 5 26 24 - 4 14 27 60 0 0 - 4 43 5 21 19 48 31 98 -64 - 4 52 19 - 4 33 51 - 5 19 1 - 4 6 59 61 0 0 - 4 35 5 21 19 54 32 98 -64 - 4 44 19 - 4 25 50 - 5 11 4 - 3 58 56 62 0 0 - 4 26 29 21 20 1 33 98 -63 - 4 35 45 - 4 17 13 - 5 2 31 - 3 50 17 63 0 0 - 4 17 19 21 20 8 34 98 -62 - 4 26 35 - 4 8 2 - 4 53 25 - 3 41 4 64 0 0 - 4 7 34 21 20 15 35 98 -61 - 4 16 51 - 3 58 16 - 4 43 43 - 3 31 15 65 0 0 - 3 57 13 21 20 22 36 98 -60 - 4 6 31 - 3 47 54 - 4 33 26 - 3 20 50 66 0 0 - 3 46 17 21 20 30 37 99 -59 - 3 55 37 - 3 36 58 - 4 22 34 - 3 9 51 67 0 0 - 3 34 47 21 20 37 38 99 -58 - 3 44 7 - 3 25 26 - 4 11 7 - 2 58 16 68 0 0 - 3 22 40 21 20 45 39 99 -57 - 3 32 2 - 3 13 19 - 3 59 5 - 2 46 5 69 0 0 - 3 9 59 21 20 53 40 99 -56 - 3 19 21 - 3 0 36 - 3 46 28 - 2 33 19 70 0 0 - 2 56 42 21 21 1 41 100 -55 - 3 6 6 - 2 47 18 - 3 33 16 - 2 19 58 71 0 0 - 2 42 50 21 21 10 42 100 -54 - 2 52 15 - 2 33 25 - 3 19 29 - 2 6 1 72 0 0 - 2 28 23 21 21 18 43 100 -53 - 2 37 49 - 2 18 56 - 3 5 7 - 1 51 29 73 0 0 - 2 13 20 21 21 27 44 101 -52 - 2 22 48 - 2 3 52 - 2 50 9 - 1 36 21 74 0 0 - 1 57 42 21 21 36 45 101 -51 - 2 7 11 - 1 48 13 - 2 34 36 - 1 20 38 75 0 0 - 1 41 29 21 21 45 46 101 -50 - 1 50 59 - 1 31 58 - 2 18 29 - 1 4 19 76 0 0 - 1 24 41 21 21 54 47 102 -49 - 1 34 13 - 1 15 9 - 2 1 46 - 0 47 25 77 0 0 - 1 7 18 21 22 4 48 102 -48 - 1 16 51 - 0 57 44 - 1 44 29 - 0 29 56 78 0 0 - 0 49 19 21 22 14 49 103 -47 - 0 58 54 - 0 39 44 - 1 26 36 - 0 11 51 79 0 0 - 0 30 46 21 22 23 50 104 -46 - 0 40 22 - 0 21 9 - 1 8 9 0 6 48 80 0 0 - 0 11 38 21 22 33 51 104 -45 - 0 21 16 - 0 1 59 - 0 49 7 0 26 2 81 0 0 0 8 5 21 22 44 52 105 -44 - 0 1 34 0 17 45 - 0 29 30 0 45 52 82 0 0 0 28 22 21 22 54 53 106 -43 0 18 41 0 38 4 - 0 9 19 1 6 16 83 0 0 0 49 14 21 23 4 54 107 -42 0 39 31 0 58 58 0 11 26 1 27 14 84 0 0 1 10 40 21 23 15 54 108 -40 1 0 56 1 20 25 0 32 45 1 48 46 85 0 0 1 32 40 21 23 26 55 109 -39 1 22 54 1 42 27 0 54 38 2 10 53 86 0 0 1 55 13 21 23 37 56 110 -38 1 45 25 2 5 2 1 17 5 2 33 33 87 0 0 2 18 20 21 23 48 57 111 -37 2 8 30 2 28 10 1 40 5 2 56 47 88 0 0 2 42 0 21 23 59 58 112 -36 2 32 8 2 51 52 2 3 37 3 20 34 89 0 0 3 6 13 21 24 11 59 113 -35 2 56 19 3 16 7 2 27 43 3 44 54 90 0 0 3 30 58 21 24 22 59 115 -34 3 21 2 3 40 54 2 52 21 4 9 47 91 0 0 3 56 15 21 24 34 60 116 -33 3 46 18 4 6 13 3 17 31 4 35 11 92 0 0 4 22 3 21 24 45 61 118 -32 4 12 5 4 32 3 3 43 12 5 1 7 93 0 0 4 48 23 21 24 57 62 119 -30 4 38 22 4 58 25 4 9 25 5 27 34 94 0 0 5 15 14 21 25 9 62 121 -29 5 5 11 5 25 17 4 36 8 5 54 32 95 0 0 5 42 34 21 25 21 63 123 -28 5 32 30 5 52 40 5 3 21 6 22 0 96 0 0 6 10 24 21 25 34 64 125 -27 6 0 18 6 20 31 5 31 4 6 49 57 97 0 0 6 38 43 21 25 46 64 127 -26 6 28 35 6 48 52 5 59 15 7 18 24 98 0 0 7 7 30 21 25 58 65 130 -25 6 57 20 7 17 41 6 27 55 7 47 18 99 0 0 7 36 45 21 26 11 65 132 -24 7 26 33 7 46 58 6 57 3 8 16 40 100 0 0 8 6 27 21 26 23 66 134 -22 7 56 13 8 16 42 7 26 38 8 46 29 101 0 0 8 36 35 21 26 36 66 137 -21 8 26 19 8 46 51 7 56 38 9 16 45 102 0 0 9 7 8 21 26 48 66 140 -20 8 56 50 9 17 26 8 27 5 9 47 25 103 0 0 9 38 6 21 27 1 66 142 -19 9 27 46 9 48 26 8 57 55 10 18 30 104 0 0 10 9 27 21 27 14 67 145 -18 9 59 6 10 19 49 9 29 10 10 49 58 105 0 0 10 41 11 21 27 26 67 148 -17 10 30 48 10 51 35 10 0 47 11 21 49 106 0 0 11 13 17 21 27 39 67 151 -15 11 2 52 11 23 42 10 32 46 11 54 1 107 0 0 11 45 44 21 27 52 67 154 -14 11 35 17 11 56 11 11 5 7 12 26 34 108 0 0 12 18 30 21 28 5 67 157 -13 12 8 2 12 28 59 11 37 47 12 59 27 109 0 0 12 51 35 21 28 18 67 160 -12 12 41 6 13 2 5 12 10 46 13 32 38 110 0 0 13 24 58 21 28 30 66 163 -11 13 14 27 13 35 30 12 44 3 14 6 7 111 0 0 13 58 37 21 28 43 66 166 -10 13 48 5 14 9 10 13 17 36 14 39 52 112 0 0 14 32 32 21 28 56 66 168 -8 14 21 58 14 43 6 13 51 25 15 13 52 113 0 0 15 6 41 21 29 8 66 171 -7 14 56 5 15 17 17 14 25 29 15 48 7 114 0 0 15 41 2 21 29 21 65 174 -6 15 30 26 15 51 40 14 59 46 16 22 34 115 0 0 16 15 36 21 29 34 65 176 -5 16 4 58 16 26 15 15 34 14 16 57 12 116 0 0 16 50 20 21 29 46 64 179 -4 16 39 41 17 1 0 16 8 54 17 32 1 117 0 0 17 25 13 21 29 59 63 181 -3 17 14 33 17 35 54 16 43 43 18 6 58 118 0 0 18 0 15 21 30 11 63 183 -2 17 49 34 18 10 57 17 18 40 18 42 4 119 0 0 18 35 23 21 30 23 62 185 0 18 24 41 18 46 6 17 53 45 19 17 16 Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: TYC 5771-01229-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 11 12.0547 DE: -09 12 18.370 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .019 ) * V mag [mag]: 9.7 * B mag [mag]: 10.8 * Apparent position with proper motion RA(deg): 317.9166800122 DE(deg): -9.1713132331 * Equation of equinoxes (radians) : 0.000040057615881 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (533) Sara approx. diameter [km]: 31 approx. diameter ["]: .017 distance from Earth [AU]: 2.55800 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 906 number of rejected observations: 75 time covered by the observations: 1901 Nov 12 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.015, 78° remarks: * orbital elements for (533) Sara : Mean anomaly = 72.63193944 deg Arg. of pericenter = 39.61702169 deg Long. of node = 180.42467674 deg Inclination = 6.54964183 deg Eccentricity = 0.04432573 Semimajor axis = 2.98237563 AU Perihelion dist = 2.85017966 AU Mag: H = 9.62, G = 0.15 Epoch of elements : MJD 54606.89400000 TDT (2008 May 20.894) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 20 533 Sara 21h 27.8m UT 9.7 21 11 12.055- 9 12 18.37TYC 5771-01229-1 10.8 15.0 31 3.1 2.558 1.180 9.01 116.9533 -9.207 -142.80 20.20 21.4629 -0.17865 0.34955 5.08544 2.62130 -0.00519 -0.00176 2000 71.3126752008 514.00000 39.617022180.424677 6.5496420.04432573 2.9823756 2.8501797 9.7 5.00.15 RATE 1.9136410 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.024 83 2.45 0.024 0 54565.5020080520_1229-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org