IOTA/IOTA-ES occultation update for (227) Philosophia / TYC 2419-00278-1 event on 2008 Mar 05, 05:30 UT Visible from Canada, USA, Mexico, Central America, Colombia Summary ------- On 2008 Mar 05 UT, the 87 km diameter asteroid (227) Philosophia will occult a 10.5 mag star in the constellation Auriga for observers along a path across Canada, USA, Mexico, Central America, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 14.6 mag (the magnitude of the asteroid) for at most 12.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 89 * date and approx. time of event: 2008 Mar 05, 05:21 - 2008 Mar 05, 05:42 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 12.2 * Moon: 8 % sunlit, 137° distance * Sun: 105° distance * rough path description: Canada, USA, Mexico, Central America, Colombia The occultation path -------------------- * approximate projected width [km]: 110 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .021", 92° ) * approx speed of asteroid's shadow [km/s]: 7.1850 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2419-00278-1 by 227 Philosophia on 2008 Mar 5 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 86 50 35 84 28 35 5 21 7 27 58 -1 80 14 1 84 21 43 93 30 19 84 30 34 73 14 35 84 8 31 100 39 57 84 27 18 101 46 37 85 56 30 5 21 25 29 73 -2 92 51 3 85 59 37 110 6 54 85 47 36 82 51 45 85 55 45 118 17 6 85 32 10 126 55 20 86 53 29 5 21 42 31 98 -3 116 39 54 87 11 56 134 57 26 86 30 24 102 47 26 87 24 23 141 42 12 86 1 33 159 45 8 86 59 11 5 22 0 32 132 -4 154 45 31 87 31 55 163 5 25 86 25 55 145 43 39 88 6 10 165 38 7 85 49 12 -174 27 52 86 15 49 5 22 18 34 158 -5 -173 29 19 86 50 33 -175 13 23 85 41 30 -171 58 38 87 29 16 -175 53 57 85 4 16 -159 10 54 85 7 52 5 22 36 35 174 -7 -156 27 21 85 39 31 -161 23 2 84 36 10 -152 35 15 86 14 2 -163 22 13 84 1 22 -150 2 49 83 50 55 5 22 54 36 184 -8 -147 8 9 84 19 25 -152 32 8 83 22 4 -143 18 41 84 50 5 -154 53 8 82 50 4 -144 6 14 82 31 6 5 23 12 38 191 -9 -141 22 28 82 57 3 -146 31 30 82 4 39 -137 56 54 83 24 50 -148 53 16 81 35 9 -139 55 2 81 10 46 5 23 29 39 196 -10 -137 25 44 81 34 43 -142 10 44 80 46 17 -134 23 38 82 0 17 -144 26 12 80 18 54 -136 46 32 79 50 54 5 23 47 40 199 -11 -134 30 51 80 13 13 -138 51 58 79 28 3 -131 48 29 80 37 3 -140 59 15 79 2 26 -134 18 1 78 31 54 5 24 5 41 203 -12 -132 14 10 78 52 53 -136 13 53 78 10 25 -129 47 58 79 15 17 -138 12 55 77 46 18 -132 16 25 77 13 57 5 24 23 42 206 -13 -130 22 41 77 33 47 -134 3 50 76 53 38 -128 9 44 77 54 59 -135 55 10 76 30 49 -130 33 49 75 57 5 5 24 41 43 208 -14 -128 48 40 76 15 57 -132 13 49 75 37 47 -126 46 42 76 36 6 -133 58 13 75 16 5 -129 5 5 74 41 18 5 24 58 44 211 -15 -127 27 17 74 59 18 -130 38 37 74 22 53 -125 34 32 75 18 32 -132 16 50 74 2 11 -127 46 49 73 26 33 5 25 16 45 213 -16 -126 15 21 73 43 47 -129 14 42 73 8 55 -124 30 23 74 2 13 -130 47 24 72 49 6 -126 36 37 72 12 47 5 25 34 45 215 -18 -125 10 38 72 29 20 -127 59 32 71 55 52 -123 32 22 72 47 2 -129 27 20 71 36 50 -125 32 47 70 59 57 5 25 52 46 217 -19 -124 11 36 71 15 52 -126 51 19 70 43 40 -122 39 7 71 32 56 -128 14 45 70 25 22 -124 34 3 69 47 59 5 26 10 47 219 -20 -123 17 5 70 3 20 -125 48 42 69 32 17 -121 49 39 70 19 47 -127 8 13 69 14 38 -123 39 28 68 36 49 5 26 28 48 221 -21 -122 26 14 68 51 39 -124 50 39 68 21 39 -121 3 15 69 7 33 -126 6 39 68 4 37 -122 48 18 67 26 24 5 26 45 48 223 -22 -121 38 24 67 40 45 -123 56 22 67 11 44 -120 19 22 67 56 9 -125 9 12 66 55 15 -121 59 59 66 16 41 5 27 3 49 226 -23 -120 53 4 66 30 35 -123 5 15 66 2 28 -119 37 33 66 45 30 -124 15 13 65 46 30 -121 14 3 65 7 36 5 27 21 49 228 -24 -120 9 50 65 21 5 -122 16 47 64 53 49 -118 57 27 65 35 33 -123 24 9 64 38 20 -120 30 8 63 59 6 5 27 39 50 230 -25 -119 28 21 64 12 12 -121 30 35 63 45 44 -118 18 48 64 26 15 -122 35 33 63 30 42 -119 47 56 62 51 9 5 27 57 50 232 -26 -118 48 21 63 3 53 -120 46 17 62 38 9 -117 41 22 63 17 32 -121 49 5 62 23 33 -119 7 11 61 43 42 5 28 15 51 234 -27 -118 9 37 61 56 4 -120 3 37 61 31 3 -117 4 59 62 9 21 -121 4 26 61 16 51 -118 27 41 60 36 41 5 28 32 51 236 -28 -117 31 58 60 48 44 -119 22 22 60 24 23 -116 29 27 61 1 39 -120 21 21 60 10 34 -117 49 15 59 30 5 5 28 50 51 238 -29 -116 55 13 59 41 48 -118 42 20 59 18 6 -115 54 39 59 54 24 -119 39 37 59 4 39 -117 11 44 58 23 51 5 29 8 52 240 -30 -116 19 15 58 35 16 -118 3 19 58 12 11 -115 20 28 58 47 32 -118 59 3 57 59 4 -116 34 59 57 17 56 5 29 26 52 242 -31 -115 43 57 57 29 4 -117 25 12 57 6 34 -114 46 48 57 41 1 -118 19 29 56 53 47 -115 58 54 56 12 19 5 29 44 52 244 -32 -115 9 11 56 23 11 -116 47 51 56 1 14 -114 13 33 56 34 49 -117 40 47 55 48 46 -115 23 22 55 6 57 5 30 1 52 246 -33 -114 34 52 55 17 32 -116 11 8 54 56 8 -113 40 38 55 28 54 -117 2 49 54 43 58 -114 48 17 54 1 48 5 30 19 52 248 -34 -114 0 55 54 12 8 -115 34 57 53 51 15 -113 7 59 54 23 12 -116 25 30 53 39 23 -114 13 34 52 56 50 5 30 37 52 250 -35 -113 27 15 53 6 55 -114 59 14 52 46 32 -112 35 32 53 17 43 -115 48 41 52 34 57 -113 39 9 51 52 1 5 30 55 52 252 -36 -112 53 49 52 1 50 -114 23 52 51 41 58 -112 3 12 52 12 23 -115 12 19 51 30 39 -113 4 57 50 47 18 5 31 13 52 254 -37 -112 20 32 50 56 54 -113 48 47 50 37 30 -111 30 57 51 7 10 -114 36 19 50 26 27 -112 30 55 49 42 40 5 31 31 52 256 -38 -111 47 20 49 52 2 -113 13 55 49 33 6 -110 58 43 50 2 3 -114 0 34 49 22 19 -111 56 57 48 38 5 5 31 48 52 258 -40 -111 14 9 48 47 13 -112 39 12 48 28 45 -110 26 26 48 56 59 -113 25 2 48 18 13 -111 23 1 47 33 30 5 32 6 52 260 -41 -110 40 57 47 42 24 -112 4 33 47 24 23 -109 54 4 47 51 56 -112 49 38 47 14 7 -110 49 3 46 28 54 5 32 24 52 262 -42 -110 7 40 46 37 35 -111 29 55 46 20 1 -109 21 33 46 46 52 -112 14 18 46 9 59 -110 15 0 45 24 15 5 32 42 51 263 -43 -109 34 15 45 32 42 -110 55 15 45 15 34 -108 48 51 45 41 44 -111 38 58 45 5 48 -109 40 47 44 19 29 5 33 0 51 265 -44 -109 0 38 44 27 43 -110 20 28 44 11 2 -108 15 53 44 36 32 -111 3 35 44 1 30 -109 6 23 43 14 36 5 33 17 51 267 -45 -108 26 46 43 22 37 -109 45 32 43 6 22 -107 42 39 43 31 11 -110 28 4 42 57 4 -108 31 43 42 9 33 5 33 35 50 269 -46 -107 52 36 42 17 20 -109 10 23 42 1 32 -107 9 3 42 25 40 -109 52 23 41 52 28 -107 56 44 41 4 17 5 33 53 50 271 -47 -107 18 5 41 11 51 -108 34 56 40 56 29 -106 35 2 41 19 56 -109 16 28 40 47 40 -107 21 22 39 58 46 5 34 11 49 272 -48 -106 43 8 40 6 7 -107 59 9 39 51 11 -106 0 35 40 13 58 -108 40 14 39 42 37 -106 45 34 38 52 57 5 34 29 49 274 -50 -106 7 43 39 0 6 -107 22 58 38 45 36 -105 25 35 39 7 41 -108 3 39 38 37 16 -106 9 15 37 46 49 5 34 47 48 276 -51 -105 31 45 37 53 44 -106 46 19 37 39 41 -104 50 1 38 1 4 -107 26 37 37 31 36 -105 32 22 36 40 17 5 35 4 47 277 -52 -104 55 11 36 46 58 -106 9 8 36 33 23 -104 13 48 36 54 3 -106 49 6 36 25 33 -104 54 50 35 33 19 5 35 22 47 279 -53 -104 17 56 35 39 46 -105 31 20 35 26 39 -103 36 51 35 46 35 -106 11 0 35 19 4 -104 16 35 34 25 52 5 35 40 46 280 -54 -103 39 55 34 32 4 -104 52 50 34 19 26 -102 59 6 34 38 37 -105 32 15 34 12 7 -103 37 31 33 17 52 5 35 58 45 281 -56 -103 1 3 33 23 49 -104 13 35 33 11 41 -102 20 28 33 30 5 -104 52 47 33 4 37 -102 57 34 32 9 15 5 36 16 44 283 -57 -102 21 15 32 14 56 -103 33 27 32 3 19 -101 40 50 32 20 55 -104 12 28 31 56 32 -102 16 35 30 59 56 5 36 34 43 284 -58 -101 40 25 31 5 21 -102 52 22 30 54 16 -101 0 7 31 11 2 -103 31 15 30 47 46 -101 34 30 29 49 52 5 36 51 42 285 -59 -100 58 24 29 55 0 -102 10 12 29 44 29 -100 18 12 30 0 21 -102 48 59 29 38 17 -100 51 10 28 38 56 5 37 9 41 287 -61 -100 15 6 28 43 46 -101 26 49 28 33 50 - 99 34 55 28 48 47 -102 5 34 28 27 57 -100 6 27 27 27 3 5 37 27 40 288 -62 - 99 30 22 27 31 34 -100 42 7 27 22 16 - 98 50 9 27 36 13 -101 20 51 27 16 43 - 99 20 10 26 14 6 5 37 45 39 289 -64 - 98 44 0 26 18 16 - 99 55 54 26 9 39 - 98 3 42 26 22 32 -100 34 42 26 4 28 - 98 32 9 24 59 57 5 38 3 38 290 -65 - 97 55 51 25 3 45 - 99 7 59 24 55 52 - 97 15 22 25 7 36 - 99 46 54 24 51 3 - 97 42 9 23 44 28 5 38 20 37 291 -66 - 97 5 38 23 47 52 - 98 18 11 23 40 46 - 96 24 55 23 51 15 - 98 57 17 23 36 22 - 96 49 55 22 27 28 5 38 38 36 292 -68 - 96 13 7 22 30 25 - 97 26 12 22 24 12 - 95 32 3 22 33 17 - 98 5 35 22 20 15 - 95 55 7 21 8 44 5 38 56 34 293 -70 - 95 17 57 21 11 11 - 96 31 46 21 5 56 - 94 36 25 21 13 29 - 97 11 31 21 2 29 - 94 57 23 19 48 1 5 39 14 33 294 -71 - 94 19 43 19 49 55 - 95 34 31 19 45 45 - 93 37 35 19 51 34 - 96 14 43 19 42 52 - 93 56 14 18 25 0 5 39 32 31 295 -73 - 93 17 55 18 26 16 - 94 33 57 18 23 21 - 92 35 1 18 27 11 - 95 14 47 18 21 6 - 92 51 3 16 59 20 5 39 50 30 296 -75 - 92 11 54 16 59 51 - 93 29 33 16 58 22 - 91 28 1 16 59 54 - 94 11 9 16 56 51 - 91 41 3 15 30 28 5 40 7 28 296 -77 - 91 0 49 15 30 6 - 92 20 31 15 30 21 - 90 15 39 15 29 7 - 93 3 8 15 29 41 - 90 25 9 13 57 45 5 40 25 26 297 -79 - 89 43 31 13 56 19 - 91 5 55 13 58 38 - 88 56 40 13 54 4 - 91 49 49 13 59 0 - 89 1 52 12 20 16 5 40 43 24 298 -81 - 88 18 22 12 17 29 - 89 44 21 12 22 24 - 87 29 13 12 13 36 - 90 29 58 12 24 3 - 87 29 1 10 36 39 5 41 1 22 299 -83 - 86 42 54 10 32 5 - 88 13 50 10 40 25 - 85 50 33 10 26 1 - 89 1 48 10 43 42 - 85 43 6 8 44 47 5 41 19 19 299 -86 - 84 53 10 8 37 41 - 86 31 19 8 50 48 - 83 55 58 8 28 28 - 87 22 35 8 56 18 - 83 37 57 6 40 54 5 41 36 16 300 -89 - 82 41 48 6 29 52 - 84 31 30 6 50 20 - 81 36 28 6 15 32 - 85 27 50 6 59 6 - 81 0 28 4 17 9 5 41 54 13 300 -88 - 79 52 7 3 58 37 - 82 3 49 4 32 39 - 78 29 13 3 33 34 - 83 8 58 4 46 56 - 77 9 3 1 8 43 5 42 12 8 300 -83 - 75 18 1 0 24 38 - 78 39 17 1 40 25 - 72 1 23 - 1 7 55 - 80 5 6 2 7 15 Uncertainty in time = +/- 7 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 2419-00278-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 00 54.1809 DE: +30 17 18.273 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 10.5 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (227) Philosophia approx. diameter [km]: 87 approx. diameter ["]: .040 distance from Earth [AU]: 3.00800 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 903 number of rejected observations: 75 time covered by the observations: 1908 Jan 30 - 2008 Feb 08 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.013, 95° remarks: * orbital elements for (227) Philosophia : Mean anomaly = 256.53137994 deg Arg. of pericenter = 262.37707248 deg Long. of node = 327.76562456 deg Inclination = 9.14543054 deg Eccentricity = 0.19804736 Semimajor axis = 3.15330457 AU Perihelion dist = 2.52880093 AU Mag: H = 9.01, G = 0.15 Epoch of elements : MJD 54530.23000000 TDT (2008 Mar 05.230) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 5 227 Philosophia 5h 30.6m UT 10.5 6 0 54.181 30 17 18.27TYC 2419-00278-1 11.8 14.6 87 12.2 3.008 0.689 -7.81 -155.7683 30.291 100.22 -5.90 5.5103 0.39937 0.45753 3.05046 -2.67227 0.00578 -0.00020 2000 256.4908962008 3 5.00000262.377072327.765625 9.1454310.19804736 3.1533046 2.5288009 8.7 5.00.15 RATE 1.7601720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.021 92 1.55 0.022 0 54523.5020080305_0278-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org