IOTA/IOTA-ES occultation update for (213) Lilaea / TYC 6294-00638-1 event on 2009 Aug 02, 21:27 UT Visible from Summary ------- On 2009 Aug 02 UT, the 83 km diameter asteroid (213) Lilaea will occult a 10.9 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 1.4 mag to 11.9 mag (the magnitude of the asteroid) for at most 12.9 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: 84 * date and approx. time of event: 2009 Aug 02, 21:15 - 2009 Aug 02, 21:35 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 12.9 * Moon: 91 % sunlit, 9° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 7.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .049", 91° ) * approx speed of asteroid's shadow [km/s]: 6.4432 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6294-00638-1 by 213 Lilaea on 2009 Aug 2 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 43 12 10 65 0 0 21 15 52 1 206 -8 41 41 29 44 42 41 39 48 42 ... .. .. 41 59 32 64 0 0 21 15 53 2 205 -9 40 31 52 43 27 0 38 42 46 ... .. .. 40 48 47 63 0 0 21 15 54 3 204 -10 39 23 51 42 13 29 37 38 8 ... .. .. 39 39 38 62 0 0 21 15 56 5 203 -11 38 17 12 41 1 47 36 34 34 42 43 22 38 31 50 61 0 0 21 15 58 6 202 -12 37 11 42 39 51 40 35 31 53 41 30 21 37 25 11 60 0 0 21 16 2 7 201 -12 36 7 10 38 42 54 34 29 56 40 18 54 36 19 31 59 0 0 21 16 5 8 200 -13 35 3 26 37 35 16 33 28 35 39 8 50 35 14 39 58 0 0 21 16 9 9 199 -14 34 0 21 36 28 37 32 27 41 37 59 55 34 10 26 57 0 0 21 16 14 10 198 -15 32 57 46 35 22 45 31 27 8 36 51 59 33 6 45 56 0 0 21 16 20 11 198 -16 31 55 36 34 17 33 30 26 49 35 44 53 32 3 29 55 0 0 21 16 26 12 197 -17 30 53 43 33 12 52 29 26 38 34 38 27 31 0 30 54 0 0 21 16 33 14 196 -18 29 52 1 32 8 36 28 26 31 33 32 34 29 57 43 53 0 0 21 16 40 15 195 -19 28 50 24 31 4 38 27 26 21 32 27 7 28 55 2 52 0 0 21 16 48 16 194 -20 27 48 48 30 0 52 26 26 4 31 21 59 27 52 21 51 0 0 21 16 56 17 193 -20 26 47 7 28 57 11 25 25 35 30 17 3 26 49 36 50 0 0 21 17 5 18 192 -21 25 45 16 27 53 31 24 24 51 29 12 14 25 46 42 49 0 0 21 17 15 19 191 -22 24 43 10 26 49 47 23 23 46 28 7 27 24 43 33 48 0 0 21 17 25 20 190 -23 23 40 46 25 45 53 22 22 16 27 2 35 23 40 6 47 0 0 21 17 36 21 189 -23 22 37 59 24 41 44 21 20 18 25 57 35 22 36 15 46 0 0 21 17 48 22 188 -24 21 34 45 23 37 17 20 17 47 24 52 21 21 31 57 45 0 0 21 18 0 24 187 -25 20 30 58 22 32 26 19 14 40 23 46 49 20 27 6 44 0 0 21 18 13 25 186 -25 19 26 36 21 27 7 18 10 51 22 40 53 19 21 40 43 0 0 21 18 27 26 185 -26 18 21 33 20 21 15 17 6 16 21 34 29 18 15 32 42 0 0 21 18 41 27 184 -27 17 15 45 19 14 46 16 0 52 20 27 33 17 8 38 41 0 0 21 18 56 28 183 -27 16 9 8 18 7 36 14 54 33 19 20 0 16 0 54 40 0 0 21 19 12 29 182 -28 15 1 36 16 59 38 13 47 15 18 11 44 14 52 15 39 0 0 21 19 28 30 181 -28 13 53 5 15 50 49 12 38 53 17 2 42 13 42 35 38 0 0 21 19 45 31 180 -29 12 43 30 14 41 4 11 29 21 15 52 47 12 31 49 37 0 0 21 20 3 32 179 -29 11 32 44 13 30 16 10 18 33 14 41 55 11 19 51 36 0 0 21 20 21 33 177 -29 10 20 42 12 18 20 9 6 24 13 30 0 10 6 35 35 0 0 21 20 40 34 176 -30 9 7 18 11 5 10 7 52 47 12 16 57 8 51 54 34 0 0 21 21 0 35 175 -30 7 52 24 9 50 41 6 37 33 11 2 38 7 35 40 33 0 0 21 21 21 36 173 -30 6 35 53 8 34 43 5 20 37 9 46 57 6 17 47 32 0 0 21 21 43 36 172 -30 5 17 36 7 17 11 4 1 48 8 29 47 4 58 5 31 0 0 21 22 5 37 170 -30 3 57 25 5 57 54 2 40 56 7 11 0 3 36 24 30 0 0 21 22 28 38 169 -30 2 35 9 4 36 46 1 17 51 5 50 27 2 12 33 29 0 0 21 22 52 39 167 -30 1 10 36 3 13 34 - 0 7 40 4 27 58 0 46 21 28 0 0 21 23 17 39 165 -30 - 0 16 27 1 48 7 - 1 35 51 3 3 23 - 0 42 28 27 0 0 21 23 43 40 163 -30 - 1 46 15 0 20 12 - 3 6 59 1 36 29 - 2 14 9 26 0 0 21 24 10 41 161 -30 - 3 19 5 - 1 10 26 - 4 41 24 0 7 3 - 3 49 2 25 0 0 21 24 38 41 160 -30 - 4 55 18 - 2 44 4 - 6 19 28 - 1 25 12 - 5 27 27 24 0 0 21 25 7 42 157 -29 - 6 35 19 - 4 21 3 - 8 1 39 - 3 0 33 - 7 9 52 23 0 0 21 25 37 42 155 -29 - 8 19 35 - 6 1 46 - 9 48 30 - 4 39 23 - 8 56 49 22 0 0 21 26 8 42 153 -28 - 10 8 44 - 7 46 43 - 11 40 41 - 6 22 6 - 10 48 57 21 0 0 21 26 41 42 151 -27 - 12 3 28 - 9 36 29 - 13 39 6 - 8 9 14 - 12 47 4 20 0 0 21 27 15 42 148 -26 - 14 4 46 - 11 31 47 - 15 44 52 - 10 1 24 - 14 52 16 19 0 0 21 27 51 42 146 -25 - 16 13 50 - 13 33 32 - 17 59 30 - 11 59 24 Latitude Latitude Latitude Latitude - 16 0 0 18 29 5 21 28 10 42 144 -25 19 6 15 17 52 23 19 53 3 17 7 32 - 17 0 0 18 2 35 21 28 27 42 143 -24 18 39 30 17 26 8 19 25 59 16 41 33 - 18 0 0 17 36 55 21 28 44 42 142 -24 18 13 37 17 0 42 18 59 47 16 16 24 - 19 0 0 17 12 6 21 29 0 41 141 -23 17 48 34 16 36 6 18 34 27 15 52 3 - 20 0 0 16 48 8 21 29 17 41 140 -22 17 24 23 16 12 20 18 9 59 15 28 31 - 21 0 0 16 24 59 21 29 33 41 139 -22 17 1 2 15 49 23 17 46 23 15 5 49 - 22 0 0 16 2 41 21 29 49 40 138 -21 16 38 32 15 27 16 17 23 37 14 43 55 - 23 0 0 15 41 13 21 30 5 40 137 -20 16 16 53 15 5 58 17 1 43 14 22 50 - 24 0 0 15 20 34 21 30 21 40 136 -20 15 56 3 14 45 30 16 40 41 14 2 34 - 25 0 0 15 0 46 21 30 37 39 135 -19 15 36 5 14 25 51 16 20 29 13 43 7 - 26 0 0 14 41 47 21 30 52 39 134 -18 15 16 56 14 7 1 16 1 8 13 24 28 - 27 0 0 14 23 37 21 31 8 38 133 -18 14 58 38 13 49 1 15 42 38 13 6 38 - 28 0 0 14 6 17 21 31 23 38 132 -17 14 41 9 13 31 49 15 24 58 12 49 36 - 29 0 0 13 49 47 21 31 38 37 131 -16 14 24 31 13 15 27 15 8 10 12 33 23 - 30 0 0 13 34 6 21 31 53 37 130 -16 14 8 43 12 59 53 14 52 11 12 17 58 - 31 0 0 13 19 15 21 32 7 36 130 -15 13 53 44 12 45 8 14 37 4 12 3 22 - 32 0 0 13 5 13 21 32 21 36 129 -14 13 39 35 12 31 13 14 22 46 11 49 33 - 33 0 0 12 52 0 21 32 36 35 128 -13 13 26 16 12 18 6 14 9 20 11 36 33 - 34 0 0 12 39 36 21 32 49 35 127 -12 13 13 47 12 5 47 13 56 43 11 24 22 - 35 0 0 12 28 2 21 33 3 34 127 -12 13 2 7 11 54 18 13 44 57 11 12 58 - 36 0 0 12 17 16 21 33 16 33 126 -11 12 51 18 11 43 37 13 34 1 11 2 23 - 37 0 0 12 7 20 21 33 30 33 125 -10 12 41 17 11 33 46 13 23 55 10 52 36 - 38 0 0 11 58 14 21 33 42 32 125 -9 12 32 7 11 24 43 13 14 40 10 43 38 - 39 0 0 11 49 57 21 33 55 31 124 -8 12 23 46 11 16 28 13 6 15 10 35 27 - 40 0 0 11 42 29 21 34 8 31 124 -8 12 16 16 11 9 3 12 58 40 10 28 6 - 41 0 0 11 35 50 21 34 20 30 123 -7 12 9 35 11 2 27 12 51 56 10 21 32 - 42 0 0 11 30 1 21 34 32 29 123 -6 12 3 44 10 56 40 12 46 3 10 15 47 - 43 0 0 11 25 2 21 34 43 29 122 -5 11 58 43 10 51 42 12 41 0 10 10 51 - 44 0 0 11 20 52 21 34 55 28 122 -4 11 54 32 10 47 33 12 36 48 10 6 44 - 45 0 0 11 17 32 21 35 6 27 121 -3 11 51 11 10 44 14 12 33 26 10 3 25 - 46 0 0 11 15 2 21 35 16 26 121 -2 11 48 41 10 41 44 12 30 56 10 0 55 - 47 0 0 11 13 22 21 35 27 25 120 -2 11 47 1 10 40 4 12 29 17 9 59 15 - 48 0 0 11 12 32 21 35 37 25 120 -1 11 46 12 10 39 13 12 28 29 9 58 24 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6294-00638-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 00 51.0187 DE: -21 18 09.113 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .046 ) * V mag [mag]: 10.9 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (213) Lilaea approx. diameter [km]: 83 approx. diameter ["]: .081 distance from Earth [AU]: 1.40500 * 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): 0.038, 0.018, 91° remarks: * orbital elements for (213) Lilaea : Mean anomaly = 6.99655399 deg Arg. of pericenter = 163.50622295 deg Long. of node = 122.17738609 deg Inclination = 6.80572057 deg Eccentricity = 0.14531084 Semimajor axis = 2.75393397 AU Perihelion dist = 2.35375751 AU Mag: H = 8.85, G = 0.15 Epoch of elements : MJD 55045.89400000 TDT (2009 Aug 02.894) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 2 213 Lilaea 21h 26.9m UT 10.9 19 0 51.019-21 18 9.11TYC 6294-00638-1 11.8 11.9 83 12.9 1.405 -1.402 -11.53 11.8825 -21.298 -140.16 17.55 21.4484 -0.37538 0.63722 -3.13483 -1.84358 0.00240 0.00014 2000 5.7254422009 728.00000163.506223122.177386 6.8057210.14531084 2.7539340 2.3537575 8.6 5.00.15 RATE 2.1566200 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.049 91 1.62 0.050 0 54545.5020090802_0638-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org