IOTA/IOTA-ES occultation update for (31) Euphrosyne / 2UCAC 25773064 event on 2008 Apr 18, 06:40 UT Visible from USA, Canada Summary ------- On 2008 Apr 18 UT, the 256 km diameter asteroid (31) Euphrosyne will occult a 13.2 mag star in the constellation Virgo for observers along a path across USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 11.6 mag (the magnitude of the asteroid) for at most 14.9 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: 84 * date and approx. time of event: 2008 Apr 18, 06:35 - 2008 Apr 18, 06:41 UT * magnitude of target star: 13.2 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 14.9 * Moon: 96 % sunlit, 33° distance * Sun: 171° distance * rough path description: USA, Canada The occultation path -------------------- * approximate projected width [km]: 506 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .090 +/- .091) * 1 sigma uncertainty ellipse (major, minor, PA): ( .091", .090", 178° ) * approx speed of asteroid's shadow [km/s]: 17.1907 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 25773064 by 31 Euphrosyne on 2008 Apr 18 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 - 34 6 50 59 0 0 6 35 22 2 234 -3 - 42 23 51 ... .. .. - 53 37 3 ... .. .. - 37 0 7 58 0 0 6 35 23 3 231 -5 - 45 14 11 - 29 12 26 - 56 30 39 ... .. .. Latitude Latitude Latitude Latitude - 39 0 0 57 18 29 6 35 24 5 230 -6 60 12 24 54 40 59 .. .. .. .. .. .. - 40 0 0 56 57 45 6 35 25 5 229 -7 59 51 3 54 20 42 63 59 40 .. .. .. - 41 0 0 56 37 3 6 35 25 6 228 -7 59 29 44 54 0 27 63 37 9 .. .. .. - 42 0 0 56 16 24 6 35 26 7 227 -8 59 8 27 53 40 17 63 14 40 50 42 58 - 43 0 0 55 55 48 6 35 27 7 226 -9 58 47 13 53 20 10 62 52 13 50 23 19 - 44 0 0 55 35 18 6 35 28 8 225 -9 58 26 3 53 0 9 62 29 49 50 3 46 - 45 0 0 55 14 52 6 35 30 8 224 -10 58 4 58 52 40 13 62 7 29 49 44 19 - 46 0 0 54 54 33 6 35 31 9 224 -11 57 43 59 52 20 24 61 45 14 49 24 59 - 47 0 0 54 34 19 6 35 32 10 223 -11 57 23 5 52 0 41 61 23 5 49 5 45 - 48 0 0 54 14 14 6 35 34 10 222 -12 57 2 19 51 41 7 61 1 3 48 46 40 - 49 0 0 53 54 16 6 35 35 11 221 -13 56 41 40 51 21 40 60 39 8 48 27 43 - 50 0 0 53 34 27 6 35 37 12 220 -13 56 21 10 51 2 22 60 17 22 48 8 55 - 51 0 0 53 14 47 6 35 39 12 219 -14 56 0 49 50 43 13 59 55 45 47 50 17 - 52 0 0 52 55 17 6 35 41 13 219 -15 55 40 38 50 24 14 59 34 18 47 31 49 - 53 0 0 52 35 57 6 35 43 14 218 -15 55 20 37 50 5 26 59 13 2 47 13 31 - 54 0 0 52 16 49 6 35 45 14 217 -16 55 0 48 49 46 49 58 51 58 46 55 25 - 55 0 0 51 57 52 6 35 47 15 216 -17 54 41 10 49 28 24 58 31 6 46 37 30 - 56 0 0 51 39 8 6 35 49 15 215 -17 54 21 45 49 10 11 58 10 27 46 19 47 - 57 0 0 51 20 37 6 35 52 16 214 -18 54 2 34 48 52 11 57 50 3 46 2 18 - 58 0 0 51 2 19 6 35 54 17 213 -19 53 43 36 48 34 24 57 29 53 45 45 1 - 59 0 0 50 44 15 6 35 57 17 212 -19 53 24 52 48 16 51 57 9 58 45 27 58 - 60 0 0 50 26 26 6 36 0 18 212 -20 53 6 23 47 59 32 56 50 19 45 11 9 - 61 0 0 50 8 52 6 36 2 18 211 -20 52 48 10 47 42 28 56 30 56 44 54 35 - 62 0 0 49 51 33 6 36 5 19 210 -21 52 30 14 47 25 40 56 11 51 44 38 16 - 63 0 0 49 34 31 6 36 8 19 209 -22 52 12 33 47 9 7 55 53 3 44 22 12 - 64 0 0 49 17 45 6 36 11 20 208 -22 51 55 10 46 52 50 55 34 34 44 6 24 - 65 0 0 49 1 16 6 36 14 21 207 -23 51 38 4 46 36 50 55 16 23 43 50 53 - 66 0 0 48 45 5 6 36 18 21 206 -24 51 21 17 46 21 8 54 58 32 43 35 38 - 67 0 0 48 29 12 6 36 21 22 205 -24 51 4 48 46 5 42 54 41 1 43 20 40 - 68 0 0 48 13 37 6 36 24 22 204 -25 50 48 38 45 50 35 54 23 50 43 6 0 - 69 0 0 47 58 21 6 36 28 23 203 -25 50 32 48 45 35 46 54 7 0 42 51 38 - 70 0 0 47 43 24 6 36 31 23 202 -26 50 17 17 45 21 15 53 50 31 42 37 34 - 71 0 0 47 28 47 6 36 35 24 201 -26 50 2 7 45 7 4 53 34 24 42 23 48 - 72 0 0 47 14 30 6 36 39 24 201 -27 49 47 18 44 53 12 53 18 39 42 10 21 - 73 0 0 47 0 32 6 36 42 25 200 -28 49 32 49 44 39 40 53 3 17 41 57 14 - 74 0 0 46 46 56 6 36 46 25 199 -28 49 18 42 44 26 28 52 48 17 41 44 26 - 75 0 0 46 33 41 6 36 50 25 198 -29 49 4 57 44 13 36 52 33 41 41 31 58 - 76 0 0 46 20 46 6 36 54 26 197 -29 48 51 34 44 1 5 52 19 28 41 19 49 - 77 0 0 46 8 14 6 36 58 26 196 -30 48 38 33 43 48 54 52 5 40 41 8 2 - 78 0 0 45 56 3 6 37 2 27 195 -30 48 25 55 43 37 5 51 52 15 40 56 34 - 79 0 0 45 44 15 6 37 6 27 194 -30 48 13 40 43 25 38 51 39 15 40 45 28 - 80 0 0 45 32 48 6 37 10 27 193 -31 48 1 49 43 14 32 51 26 40 40 34 43 - 81 0 0 45 21 45 6 37 15 28 192 -31 47 50 20 43 3 49 51 14 30 40 24 19 - 82 0 0 45 11 5 6 37 19 28 190 -32 47 39 16 42 53 27 51 2 46 40 14 17 - 83 0 0 45 0 47 6 37 23 28 189 -32 47 28 36 42 43 28 50 51 27 40 4 36 - 84 0 0 44 50 53 6 37 28 28 188 -33 47 18 20 42 33 52 50 40 34 39 55 18 - 85 0 0 44 41 23 6 37 32 29 187 -33 47 8 29 42 24 38 50 30 7 39 46 21 - 86 0 0 44 32 17 6 37 37 29 186 -33 46 59 2 42 15 48 50 20 6 39 37 47 - 87 0 0 44 23 34 6 37 41 29 185 -34 46 50 0 42 7 21 50 10 32 39 29 36 - 88 0 0 44 15 16 6 37 45 29 184 -34 46 41 23 41 59 18 50 1 25 39 21 47 - 89 0 0 44 7 22 6 37 50 29 183 -34 46 33 12 41 51 38 49 52 44 39 14 22 - 90 0 0 43 59 52 6 37 55 30 182 -34 46 25 26 41 44 21 49 44 31 39 7 19 - 91 0 0 43 52 48 6 37 59 30 181 -35 46 18 6 41 37 29 49 36 45 39 0 39 - 92 0 0 43 46 8 6 38 4 30 180 -35 46 11 11 41 31 1 49 29 26 38 54 23 - 93 0 0 43 39 53 6 38 8 30 179 -35 46 4 43 41 24 57 49 22 34 38 48 30 - 94 0 0 43 34 3 6 38 13 30 178 -35 45 58 40 41 19 17 49 16 10 38 43 1 - 95 0 0 43 28 38 6 38 18 30 177 -35 45 53 3 41 14 2 49 10 14 38 37 55 - 96 0 0 43 23 38 6 38 22 30 175 -36 45 47 53 41 9 11 49 4 46 38 33 13 - 97 0 0 43 19 4 6 38 27 30 174 -36 45 43 9 41 4 45 48 59 46 38 28 55 - 98 0 0 43 14 56 6 38 32 30 173 -36 45 38 52 41 0 44 48 55 14 38 25 1 - 99 0 0 43 11 13 6 38 36 30 172 -36 45 35 1 40 57 7 48 51 10 38 21 31 -100 0 0 43 7 56 6 38 41 30 171 -36 45 31 37 40 53 56 48 47 34 38 18 25 -101 0 0 43 5 4 6 38 46 30 170 -36 45 28 39 40 51 9 48 44 26 38 15 43 -102 0 0 43 2 38 6 38 50 30 169 -36 45 26 8 40 48 47 48 41 47 38 13 26 -103 0 0 43 0 38 6 38 55 30 168 -36 45 24 4 40 46 51 48 39 36 38 11 33 -104 0 0 42 59 4 6 38 59 30 167 -36 45 22 27 40 45 19 48 37 54 38 10 4 -105 0 0 42 57 56 6 39 4 30 166 -36 45 21 17 40 44 13 48 36 40 38 8 59 -106 0 0 42 57 14 6 39 8 29 165 -36 45 20 33 40 43 31 48 35 54 38 8 19 -107 0 0 42 56 58 6 39 13 29 164 -36 45 20 17 40 43 15 48 35 38 38 8 3 -108 0 0 42 57 7 6 39 18 29 163 -36 45 20 27 40 43 25 48 35 49 38 8 11 -109 0 0 42 57 43 6 39 22 29 161 -36 45 21 5 40 43 59 48 36 29 38 8 44 -110 0 0 42 58 45 6 39 26 28 160 -35 45 22 9 40 44 58 48 37 38 38 9 41 -111 0 0 43 0 13 6 39 31 28 159 -35 45 23 41 40 46 23 48 39 16 38 11 3 -112 0 0 43 2 6 6 39 35 28 158 -35 45 25 39 40 48 13 48 41 21 38 12 49 -113 0 0 43 4 26 6 39 40 28 157 -35 45 28 4 40 50 28 48 43 56 38 15 0 -114 0 0 43 7 11 6 39 44 27 156 -35 45 30 56 40 53 8 48 46 59 38 17 35 -115 0 0 43 10 23 6 39 48 27 155 -34 45 34 15 40 56 14 48 50 30 38 20 34 -116 0 0 43 14 0 6 39 52 27 154 -34 45 38 1 40 59 44 48 54 30 38 23 57 -117 0 0 43 18 3 6 39 56 26 153 -34 45 42 13 41 3 39 48 58 58 38 27 45 -118 0 0 43 22 32 6 40 0 26 152 -33 45 46 52 41 8 0 49 3 54 38 31 56 -119 0 0 43 27 26 6 40 4 25 151 -33 45 51 58 41 12 45 49 9 18 38 36 32 -120 0 0 43 32 46 6 40 8 25 151 -33 45 57 30 41 17 55 49 15 11 38 41 32 -121 0 0 43 38 31 6 40 12 25 150 -32 46 3 29 41 23 29 49 21 31 38 46 55 -122 0 0 43 44 42 6 40 16 24 149 -32 46 9 54 41 29 29 49 28 20 38 52 43 -123 0 0 43 51 18 6 40 20 24 148 -32 46 16 45 41 35 52 49 35 36 38 58 54 -124 0 0 43 58 19 6 40 23 23 147 -31 46 24 2 41 42 40 49 43 20 39 5 29 -125 0 0 44 5 45 6 40 27 23 146 -31 46 31 45 41 49 52 49 51 32 39 12 27 -126 0 0 44 13 36 6 40 31 22 145 -30 46 39 54 41 57 29 50 0 10 39 19 49 -127 0 0 44 21 51 6 40 34 22 144 -30 46 48 28 42 5 29 50 9 17 39 27 34 -128 0 0 44 30 31 6 40 37 21 143 -29 46 57 28 42 13 53 50 18 50 39 35 42 -129 0 0 44 39 36 6 40 41 21 142 -29 47 6 54 42 22 41 50 28 50 39 44 13 -130 0 0 44 49 5 6 40 44 20 142 -28 47 16 44 42 31 52 50 39 17 39 53 6 -131 0 0 44 58 57 6 40 47 19 141 -28 47 26 59 42 41 27 50 50 10 40 2 22 -132 0 0 45 9 14 6 40 50 19 140 -27 47 37 39 42 51 24 51 1 30 40 12 1 -133 0 0 45 19 54 6 40 53 18 139 -27 47 48 44 43 1 45 51 13 16 40 22 2 -134 0 0 45 30 58 6 40 56 18 138 -26 48 0 13 43 12 28 51 25 27 40 32 25 -135 0 0 45 42 24 6 40 59 17 137 -25 48 12 6 43 23 34 51 38 4 40 43 9 -136 0 0 45 54 14 6 41 1 16 137 -25 48 24 22 43 35 2 51 51 7 40 54 16 -137 0 0 46 6 26 6 41 4 16 136 -24 48 37 2 43 46 52 52 4 34 41 5 43 -138 0 0 46 19 0 6 41 6 15 135 -24 48 50 5 43 59 3 52 18 27 41 17 32 -139 0 0 46 31 57 6 41 9 15 134 -23 49 3 31 44 11 36 52 32 43 41 29 41 -140 0 0 46 45 15 6 41 11 14 133 -22 49 17 20 44 24 30 52 47 24 41 42 11 -141 0 0 46 58 55 6 41 13 13 133 -22 49 31 31 44 37 45 53 2 28 41 55 1 -142 0 0 47 12 55 6 41 15 13 132 -21 49 46 4 44 51 21 53 17 56 42 8 11 -143 0 0 47 27 17 6 41 17 12 131 -21 50 0 58 45 5 16 53 33 47 42 21 41 -144 0 0 47 41 59 6 41 19 11 130 -20 50 16 14 45 19 32 53 50 0 42 35 30 -145 0 0 47 57 1 6 41 21 11 129 -19 50 31 50 45 34 7 54 6 36 42 49 38 -146 0 0 48 12 22 6 41 22 10 129 -19 50 47 46 45 49 1 54 23 33 43 4 5 -147 0 0 48 28 3 6 41 24 9 128 -18 51 4 3 46 4 14 54 40 52 43 18 50 -148 0 0 48 44 3 6 41 25 9 127 -17 51 20 39 46 19 45 54 58 31 43 33 53 -149 0 0 49 0 21 6 41 26 8 126 -17 51 37 34 46 35 34 55 16 31 43 49 14 -150 0 0 49 16 57 6 41 28 7 126 -16 51 54 47 46 51 41 55 34 50 .. .. .. -151 0 0 49 33 50 6 41 29 6 125 -15 52 12 19 47 8 4 55 53 29 .. .. .. -152 0 0 49 51 1 6 41 30 6 124 -14 52 30 8 47 24 45 56 12 26 .. .. .. -153 0 0 50 8 28 6 41 31 5 123 -14 52 48 13 47 41 41 56 31 41 .. .. .. -154 0 0 50 26 11 6 41 31 4 122 -13 53 6 36 47 58 54 56 51 14 .. .. .. -155 0 0 50 44 9 6 41 32 4 122 -12 53 25 14 48 16 21 57 11 3 .. .. .. -156 0 0 51 2 22 6 41 32 3 121 -12 53 44 8 48 34 3 .. .. .. .. .. .. -157 0 0 51 20 50 6 41 33 2 120 -11 54 3 16 48 52 0 .. .. .. .. .. .. -158 0 0 51 39 32 6 41 33 2 119 -10 54 22 38 49 10 10 .. .. .. .. .. .. -159 0 0 51 58 26 6 41 33 1 119 -10 .. .. .. 49 28 33 .. .. .. .. .. .. -160 0 0 52 17 33 6 41 33 0 118 -9 .. .. .. 49 47 8 .. .. .. .. .. .. Uncertainty in time = +/- 9 secs [Prediction of 2008 Apr 17.0] Data for the target star ------------------------ * name: 2UCAC 25773064 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 17 16.8494 DE: -16 25 48.000 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .090, .090 ) * V mag [mag]: 13.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (31) Euphrosyne approx. diameter [km]: 256 approx. diameter ["]: .147 distance from Earth [AU]: 2.40100 * orbital information: orbit source: Preston date of fit: 2008 Apr 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 966 number of rejected observations: 86 time covered by the observations: 1907 Apr 10 - 2008 Apr 16 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.013, 135° remarks: * orbital elements for (31) Euphrosyne : Mean anomaly = 98.22297682 deg Arg. of pericenter = 61.95569783 deg Long. of node = 31.23340561 deg Inclination = 26.31723842 deg Eccentricity = 0.22553719 Semimajor axis = 3.14849797 AU Perihelion dist = 2.43839457 AU Mag: H = 6.75, G = 0.15 Epoch of elements : MJD 54574.27800000 TDT (2008 Apr 18.278) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 18 31 Euphrosyne 6h 38.5m UT 13.2 14 17 16.849-16 25 48.002UCAC 25773064 0.0 11.6 256 14.9 2.401 -2.464 -2.69 -92.0470 -16.428 80.22 10.98 6.6409 -0.06524 0.86027 -9.67500 -0.73535 -0.00076 0.00054 2000 97.4682502008 414.00000 61.955698 31.233406 26.3172380.22553719 3.1484980 2.4383946 6.7 5.00.15 RATE 1.7642050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.091 0.090 178 1.62 0.091 0 54573.5020080418_773064 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 17, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org