IOTA/IOTA-ES occultation update for (213) Lilaea / UCAC2 24471722 event on 2009 Jul 08, 04:02 UT Visible from Summary ------- On 2009 Jul 08 UT, the 83 km diameter asteroid (213) Lilaea will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 11.4 mag (the magnitude of the asteroid) for at most 9.3 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: 88 * date and approx. time of event: 2009 Jul 08, 03:56 - 2009 Jul 08, 04:07 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 9.3 * Moon: 99 % sunlit, 7° distance * Sun: 176° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 186 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .045", 89° ) * approx speed of asteroid's shadow [km/s]: 8.9224 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24471722 by 213 Lilaea on 2009 Jul 8 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 - 47 40 53 67 0 0 3 56 37 4 187 0 - 49 58 45 - 45 26 8 - 52 34 32 ... .. .. - 48 22 39 66 0 0 3 56 39 5 186 -1 - 50 36 8 - 46 12 10 - 53 6 56 - 43 51 41 - 49 7 0 65 0 0 3 56 42 6 186 -2 - 51 16 34 - 47 0 21 - 53 42 55 - 44 43 58 - 49 53 47 64 0 0 3 56 45 7 185 -3 - 51 59 50 - 47 50 33 - 54 22 14 - 45 37 52 - 50 42 52 63 0 0 3 56 49 8 184 -4 - 52 45 48 - 48 42 42 - 55 4 40 - 46 33 22 - 51 34 12 62 0 0 3 56 54 9 183 -6 - 53 34 21 - 49 36 47 - 55 50 5 - 47 30 25 - 52 27 43 61 0 0 3 56 59 10 183 -7 - 54 25 24 - 50 32 44 - 56 38 22 - 48 29 1 - 53 23 22 60 0 0 3 57 4 11 182 -8 - 55 18 53 - 51 30 33 - 57 29 26 - 49 29 13 - 54 21 10 59 0 0 3 57 10 12 181 -9 - 56 14 47 - 52 30 15 - 58 23 14 - 50 31 1 - 55 21 7 58 0 0 3 57 17 13 180 -10 - 57 13 5 - 53 31 51 - 59 19 44 - 51 34 27 - 56 23 14 57 0 0 3 57 25 14 179 -11 - 58 13 48 - 54 35 23 - 60 18 58 - 52 39 34 - 57 27 34 56 0 0 3 57 33 15 178 -12 - 59 16 59 - 55 40 54 - 61 20 55 - 53 46 26 - 58 34 10 55 0 0 3 57 42 16 177 -13 - 60 22 40 - 56 48 29 - 62 25 41 - 54 55 7 - 59 43 8 54 0 0 3 57 51 17 176 -14 - 61 30 58 - 57 58 11 - 63 33 20 - 56 5 43 - 60 54 34 53 0 0 3 58 1 18 175 -15 - 62 41 58 - 59 10 8 - 64 43 59 - 57 18 19 - 62 8 35 52 0 0 3 58 12 19 173 -16 - 63 55 49 - 60 24 26 - 65 57 47 - 58 33 2 - 63 25 21 51 0 0 3 58 24 20 172 -17 - 65 12 40 - 61 41 15 - 67 14 55 - 59 50 2 - 64 45 3 50 0 0 3 58 36 21 171 -17 - 66 32 44 - 63 0 45 - 68 35 38 - 61 9 27 - 66 7 55 49 0 0 3 58 50 21 169 -18 - 67 56 16 - 64 23 7 - 70 0 11 - 62 31 29 - 67 34 12 48 0 0 3 59 4 22 168 -19 - 69 23 35 - 65 48 37 - 71 28 58 - 63 56 20 - 69 4 13 47 0 0 3 59 19 23 166 -20 - 70 55 1 - 67 17 31 - 73 2 23 - 65 24 16 - 70 38 23 46 0 0 3 59 35 24 165 -21 - 72 31 3 - 68 50 10 - 74 41 0 - 66 55 35 - 72 17 10 45 0 0 3 59 52 24 163 -22 - 74 12 16 - 70 26 59 - 76 25 32 - 68 30 39 - 74 1 11 44 0 0 4 0 10 25 161 -22 - 75 59 21 - 72 8 29 - 78 16 54 - 70 9 53 - 75 51 11 43 0 0 4 0 29 25 159 -23 - 77 53 17 - 73 55 17 - 80 16 18 - 71 53 49 - 77 48 9 42 0 0 4 0 50 26 157 -23 - 79 55 17 - 75 48 13 - 82 25 27 - 73 43 8 - 79 53 26 41 0 0 4 1 12 26 155 -24 - 82 7 6 - 77 48 18 - 84 46 45 - 75 38 40 Latitude Latitude Latitude Latitude - 81 0 0 40 29 53 4 1 24 26 154 -24 41 29 55 39 32 13 42 39 8 38 31 12 - 82 0 0 40 3 46 4 1 35 26 153 -24 41 3 6 39 6 43 42 11 26 38 6 19 - 83 0 0 39 38 37 4 1 45 26 152 -24 40 37 18 38 42 10 41 44 47 37 42 20 - 84 0 0 39 14 26 4 1 56 26 151 -24 40 12 30 38 18 32 41 19 12 37 19 15 - 85 0 0 38 51 13 4 2 6 26 150 -24 39 48 42 37 55 50 40 54 40 36 57 4 - 86 0 0 38 28 57 4 2 16 26 149 -24 39 25 53 37 34 4 40 31 10 36 35 47 - 87 0 0 38 7 38 4 2 27 26 148 -24 39 4 3 37 13 12 40 8 42 36 15 22 - 88 0 0 37 47 15 4 2 37 26 147 -24 38 43 11 36 53 15 39 47 14 35 55 51 - 89 0 0 37 27 49 4 2 47 26 146 -24 38 23 18 36 34 13 39 26 47 35 37 13 - 90 0 0 37 9 18 4 2 57 26 145 -24 38 4 22 36 16 5 39 7 20 35 19 28 - 91 0 0 36 51 43 4 3 7 25 144 -24 37 46 23 35 58 52 38 48 52 35 2 36 - 92 0 0 36 35 4 4 3 17 25 143 -24 37 29 22 35 42 32 38 31 24 34 46 36 - 93 0 0 36 19 20 4 3 27 25 142 -23 37 13 17 35 27 6 38 14 54 34 31 28 - 94 0 0 36 4 31 4 3 36 25 141 -23 36 58 9 35 12 34 37 59 23 34 17 13 - 95 0 0 35 50 36 4 3 46 24 140 -23 36 43 58 34 58 56 37 44 50 34 3 51 - 96 0 0 35 37 37 4 3 55 24 139 -23 36 30 42 34 46 11 37 31 15 33 51 20 - 97 0 0 35 25 32 4 4 4 24 138 -22 36 18 23 34 34 20 37 18 37 33 39 42 - 98 0 0 35 14 22 4 4 13 23 137 -22 36 7 0 34 23 22 37 6 58 33 28 56 - 99 0 0 35 4 7 4 4 22 23 137 -22 35 56 32 34 13 17 36 56 16 33 19 3 -100 0 0 34 54 46 4 4 31 22 136 -21 35 47 1 34 4 6 36 46 31 33 10 1 -101 0 0 34 46 19 4 4 40 22 135 -21 35 38 25 33 55 48 36 37 43 33 1 51 -102 0 0 34 38 47 4 4 48 21 134 -20 35 30 44 33 48 23 36 29 53 32 54 34 -103 0 0 34 32 9 4 4 56 21 133 -20 35 24 0 33 41 52 36 23 0 32 48 9 -104 0 0 34 26 26 4 5 4 20 133 -20 35 18 11 33 36 13 36 17 4 32 42 36 -105 0 0 34 21 37 4 5 12 20 132 -19 35 13 17 33 31 29 36 12 5 32 37 56 -106 0 0 34 17 43 4 5 19 19 131 -19 35 9 20 33 27 38 36 8 3 32 34 7 -107 0 0 34 14 43 4 5 27 19 130 -18 35 6 18 33 24 40 36 4 59 32 31 12 -108 0 0 34 12 39 4 5 34 18 130 -17 35 4 12 33 22 36 36 2 52 32 29 9 -109 0 0 34 11 29 4 5 41 18 129 -17 35 3 2 33 21 26 36 1 42 32 27 58 -110 0 0 34 11 14 4 5 48 17 128 -16 35 2 49 33 21 10 36 1 30 32 27 41 -111 0 0 34 11 54 4 5 54 16 128 -16 35 3 32 33 21 48 36 2 16 32 28 16 -112 0 0 34 13 30 4 6 0 16 127 -15 35 5 11 33 23 20 36 4 0 32 29 45 -113 0 0 34 16 1 4 6 6 15 126 -14 35 7 47 33 25 46 36 6 42 32 32 7 -114 0 0 34 19 28 4 6 12 14 126 -14 35 11 20 33 29 8 36 10 23 32 35 23 -115 0 0 34 23 51 4 6 18 14 125 -13 35 15 51 33 33 24 36 15 2 32 39 32 -116 0 0 34 29 10 4 6 23 13 124 -12 35 21 19 33 38 35 36 20 41 32 44 35 -117 0 0 34 35 26 4 6 28 12 124 -12 35 27 44 33 44 42 36 27 19 32 50 33 -118 0 0 34 42 38 4 6 33 11 123 -11 35 35 8 33 51 44 36 34 56 32 57 25 -119 0 0 34 50 48 4 6 37 11 122 -10 35 43 31 33 59 42 36 43 34 33 5 11 -120 0 0 34 59 55 4 6 41 10 122 -10 35 52 52 34 8 37 36 53 12 33 13 53 -121 0 0 35 10 0 4 6 45 9 121 -9 36 3 12 34 18 28 37 3 52 33 23 30 -122 0 0 35 21 4 4 6 48 8 121 -8 36 14 33 34 29 16 37 15 33 33 34 3 -123 0 0 35 33 6 4 6 52 8 120 -7 36 26 53 34 41 2 37 28 16 33 45 32 -124 0 0 35 46 7 4 6 54 7 119 -6 36 40 14 34 53 45 37 42 1 33 57 57 -125 0 0 36 0 8 4 6 57 6 119 -6 36 54 37 35 7 26 37 56 50 34 11 19 -126 0 0 36 15 9 4 6 59 5 118 -5 37 10 1 35 22 6 38 12 42 34 25 38 -127 0 0 36 31 11 4 7 1 4 118 -4 37 26 27 35 37 45 38 29 39 .. .. .. -128 0 0 36 48 13 4 7 3 3 117 -3 37 43 56 35 54 23 38 47 42 .. .. .. -129 0 0 37 6 17 4 7 4 3 116 -2 38 2 29 36 12 2 39 6 50 .. .. .. -130 0 0 37 25 24 4 7 5 2 116 -2 38 22 6 36 30 41 39 27 5 .. .. .. -131 0 0 37 45 33 4 7 5 1 115 -1 38 42 48 36 50 21 .. .. .. .. .. .. Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 24471722 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 20 44.9579 DE: -19 07 08.956 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .041 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (213) Lilaea approx. diameter [km]: 83 approx. diameter ["]: .085 distance from Earth [AU]: 1.33900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 837 number of rejected observations: 118 time covered by the observations: 1914 Oct 13 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.019, 89° remarks: * orbital elements for (213) Lilaea : Mean anomaly = 1.44564862 deg Arg. of pericenter = 163.51055441 deg Long. of node = 122.17726660 deg Inclination = 6.80579711 deg Eccentricity = 0.14523654 Semimajor axis = 2.75369811 AU Perihelion dist = 2.35376052 AU Mag: H = 8.85, G = 0.15 Epoch of elements : MJD 55020.16800000 TDT (2009 Jul 08.168) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 8 213 Lilaea 4h 1.8m UT 11.6 19 20 44.958-19 7 8.96UCAC2 24471722 0.0 11.4 83 9.3 1.339 -2.148 -12.94 -56.5116 -19.114 120.82 22.46 4.0301 -0.35008 0.82339 -4.63458 -1.97036 -0.00025 -0.00031 2000 1.4094132009 7 8.00000163.510554122.177267 6.8057970.14523654 2.7536981 2.3537605 8.6 5.00.15 RATE 2.1568980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.056 0.045 89 1.55 0.047 0 54545.5020090708_471722 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org