IOTA/IOTA-ES occultation update for (495) Eulalia / TYC 6243-00231-1 event on 2007 Jul 25, 03:26 UT Visible from S USA Summary ------- On 2007 Jul 25 UT, the 39 km diameter asteroid (495) Eulalia will occult a 12.0 mag star in the constellation Ophiuchus for observers along a path across S USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.7 mag (the magnitude of the asteroid) for at most 6.4 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: 45 * date and approx. time of event: 2007 Jul 25, 03:14 - 2007 Jul 25, 03:34 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 6.4 * Moon: 77 % sunlit, 21° distance * Sun: 142° distance * rough path description: S USA The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 9.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .045", 90° ) * approx speed of asteroid's shadow [km/s]: 6.1174 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6243-00231-1 by 495 Eulalia on 2007 Jul 25 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 ... .. .. 54 0 0 .. .. .. .. .. .. - 27 30 9 ... .. .. - 30 8 43 ... .. .. - 29 0 4 53 0 0 3 14 2 1 233 -16 - 29 53 43 - 28 6 42 - 32 31 4 ... .. .. - 31 23 59 52 0 0 3 14 4 3 232 -17 - 32 17 18 - 30 30 59 - 34 53 53 ... .. .. Latitude Latitude Latitude Latitude - 33 0 0 51 20 2 3 14 6 4 230 -18 51 42 11 50 58 8 52 47 49 .. .. .. - 34 0 0 50 55 8 3 14 8 5 230 -19 51 17 12 50 33 18 52 22 36 .. .. .. - 35 0 0 50 30 17 3 14 10 6 229 -19 50 52 17 50 8 31 51 57 26 49 6 39 - 36 0 0 50 5 31 3 14 13 7 228 -20 50 27 26 49 43 50 51 32 21 48 42 10 - 37 0 0 49 40 51 3 14 16 7 227 -20 50 2 41 49 19 15 51 7 20 48 17 48 - 38 0 0 49 16 17 3 14 19 8 226 -21 49 38 2 48 54 45 50 42 26 47 53 32 - 39 0 0 48 51 50 3 14 22 9 226 -21 49 13 30 48 30 24 50 17 39 47 29 24 - 40 0 0 48 27 32 3 14 26 10 225 -22 48 49 6 48 6 10 49 52 59 47 5 24 - 41 0 0 48 3 22 3 14 30 10 224 -22 48 24 51 47 42 5 49 28 28 46 41 33 - 42 0 0 47 39 22 3 14 35 11 223 -23 48 0 46 47 18 11 49 4 7 46 17 52 - 43 0 0 47 15 32 3 14 40 12 223 -23 47 36 51 46 54 26 48 39 56 45 54 22 - 44 0 0 46 51 54 3 14 45 13 222 -23 47 13 8 46 30 53 48 15 56 45 31 2 - 45 0 0 46 28 28 3 14 50 13 221 -24 46 49 36 46 7 31 47 52 8 45 7 55 - 46 0 0 46 5 14 3 14 56 14 220 -24 46 26 17 45 44 23 47 28 33 44 45 1 - 47 0 0 45 42 13 3 15 2 15 220 -25 46 3 11 45 21 27 47 5 10 44 22 19 - 48 0 0 45 19 26 3 15 8 16 219 -25 45 40 19 44 58 46 46 42 2 43 59 52 - 49 0 0 44 56 54 3 15 15 16 218 -25 45 17 42 44 36 19 46 19 9 43 37 39 - 50 0 0 44 34 38 3 15 22 17 217 -26 44 55 19 44 14 7 45 56 30 43 15 42 - 51 0 0 44 12 36 3 15 29 18 216 -26 44 33 13 43 52 11 45 34 8 42 54 0 - 52 0 0 43 50 52 3 15 36 18 216 -26 44 11 23 43 30 32 45 12 2 42 32 34 - 53 0 0 43 29 24 3 15 44 19 215 -27 43 49 51 43 9 9 44 50 14 42 11 26 - 54 0 0 43 8 14 3 15 52 20 214 -27 43 28 35 42 48 4 44 28 43 41 50 34 - 55 0 0 42 47 22 3 16 1 20 213 -27 43 7 38 42 27 17 44 7 30 41 30 1 - 56 0 0 42 26 48 3 16 9 21 212 -27 42 47 0 42 6 48 43 46 36 41 9 46 - 57 0 0 42 6 34 3 16 18 22 212 -28 42 26 40 41 46 38 43 26 1 40 49 49 - 58 0 0 41 46 39 3 16 27 22 211 -28 42 6 40 41 26 48 43 5 47 40 30 12 - 59 0 0 41 27 4 3 16 37 23 210 -28 41 47 0 41 7 17 42 45 52 40 10 54 - 60 0 0 41 7 49 3 16 46 24 209 -28 41 27 40 40 48 7 42 26 18 39 51 57 - 61 0 0 40 48 54 3 16 56 24 208 -28 41 8 42 40 29 18 42 7 5 39 33 20 - 62 0 0 40 30 21 3 17 7 25 207 -28 40 50 4 40 10 49 41 48 13 39 15 3 - 63 0 0 40 12 10 3 17 17 26 207 -29 40 31 48 39 52 42 41 29 43 38 57 8 - 64 0 0 39 54 20 3 17 28 26 206 -29 40 13 54 39 34 56 41 11 36 38 39 35 - 65 0 0 39 36 53 3 17 39 27 205 -29 39 56 22 39 17 33 40 53 51 38 22 23 - 66 0 0 39 19 48 3 17 50 27 204 -29 39 39 13 39 0 32 40 36 29 38 5 34 - 67 0 0 39 3 5 3 18 1 28 203 -29 39 22 26 38 43 54 40 19 30 37 49 7 - 68 0 0 38 46 46 3 18 12 28 202 -29 39 6 3 38 27 39 40 2 54 37 33 2 - 69 0 0 38 30 51 3 18 24 29 201 -29 38 50 4 38 11 47 39 46 42 37 17 21 - 70 0 0 38 15 19 3 18 36 29 200 -29 38 34 28 37 56 19 39 30 55 37 2 3 - 71 0 0 38 0 10 3 18 48 30 199 -28 38 19 16 37 41 14 39 15 32 36 47 9 - 72 0 0 37 45 26 3 19 0 30 198 -28 38 4 28 37 26 34 39 0 33 36 32 38 - 73 0 0 37 31 7 3 19 13 31 197 -28 37 50 5 37 12 17 38 45 59 36 18 32 - 74 0 0 37 17 12 3 19 25 31 197 -28 37 36 6 36 58 26 38 31 50 36 4 49 - 75 0 0 37 3 41 3 19 38 32 196 -28 37 22 33 36 44 59 38 18 6 35 51 31 - 76 0 0 36 50 36 3 19 51 32 195 -28 37 9 24 36 31 57 38 4 48 35 38 38 - 77 0 0 36 37 56 3 20 4 32 194 -28 36 56 41 36 19 19 37 51 55 35 26 9 - 78 0 0 36 25 41 3 20 17 33 193 -27 36 44 23 36 7 8 37 39 29 35 14 5 - 79 0 0 36 13 52 3 20 31 33 192 -27 36 32 31 35 55 21 37 27 28 35 2 27 - 80 0 0 36 2 28 3 20 44 34 190 -27 36 21 5 35 44 0 37 15 53 34 51 13 - 81 0 0 35 51 31 3 20 57 34 189 -27 36 10 4 35 33 5 37 4 44 34 40 25 - 82 0 0 35 40 59 3 21 11 34 188 -26 35 59 30 35 22 36 36 54 2 34 30 3 - 83 0 0 35 30 53 3 21 25 34 187 -26 35 49 22 35 12 33 36 43 47 34 20 6 - 84 0 0 35 21 14 3 21 38 35 186 -26 35 39 40 35 2 55 36 33 58 34 10 35 - 85 0 0 35 12 1 3 21 52 35 185 -25 35 30 25 34 53 45 36 24 36 34 1 30 - 86 0 0 35 3 14 3 22 6 35 184 -25 35 21 36 34 45 0 36 15 41 33 52 52 - 87 0 0 34 54 54 3 22 20 35 183 -25 35 13 14 34 36 42 36 7 13 33 44 39 - 88 0 0 34 47 1 3 22 34 35 182 -24 35 5 19 34 28 50 35 59 12 33 36 52 - 89 0 0 34 39 34 3 22 48 36 181 -24 34 57 51 34 21 25 35 51 38 33 29 32 - 90 0 0 34 32 34 3 23 3 36 180 -23 34 50 49 34 14 27 35 44 32 33 22 39 - 91 0 0 34 26 1 3 23 17 36 179 -23 34 44 15 34 7 56 35 37 53 33 16 11 - 92 0 0 34 19 56 3 23 31 36 178 -22 34 38 8 34 1 52 35 31 41 33 10 11 - 93 0 0 34 14 17 3 23 45 36 177 -22 34 32 28 33 56 14 35 25 58 33 4 37 - 94 0 0 34 9 6 3 23 59 36 175 -21 34 27 15 33 51 4 35 20 41 32 59 30 - 95 0 0 34 4 21 3 24 14 36 174 -21 34 22 30 33 46 21 35 15 53 32 54 50 - 96 0 0 34 0 5 3 24 28 36 173 -20 34 18 12 33 42 5 35 11 32 32 50 36 - 97 0 0 33 56 15 3 24 42 36 172 -20 34 14 22 33 38 16 35 7 39 32 46 50 - 98 0 0 33 52 53 3 24 56 36 171 -19 34 10 59 33 34 55 35 4 14 32 43 31 - 99 0 0 33 49 58 3 25 11 36 170 -19 34 8 4 33 32 1 35 1 17 32 40 38 -100 0 0 33 47 31 3 25 25 36 169 -18 34 5 36 33 29 34 34 58 48 32 38 13 -101 0 0 33 45 32 3 25 39 36 168 -18 34 3 36 33 27 35 34 56 47 32 36 15 -102 0 0 33 44 0 3 25 53 35 167 -17 34 2 4 33 26 3 34 55 14 32 34 44 -103 0 0 33 42 56 3 26 7 35 166 -16 34 1 0 33 24 59 34 54 9 32 33 40 -104 0 0 33 42 19 3 26 21 35 165 -16 34 0 23 33 24 23 34 53 33 32 33 4 -105 0 0 33 42 10 3 26 35 35 164 -15 34 0 14 33 24 14 34 53 24 32 32 55 -106 0 0 33 42 29 3 26 49 35 163 -15 34 0 34 33 24 33 34 53 44 32 33 13 -107 0 0 33 43 16 3 27 3 34 161 -14 34 1 21 33 25 19 34 54 32 32 33 59 -108 0 0 33 44 30 3 27 16 34 160 -13 34 2 36 33 26 33 34 55 48 32 35 12 -109 0 0 33 46 13 3 27 30 34 159 -13 34 4 18 33 28 15 34 57 33 32 36 52 -110 0 0 33 48 23 3 27 43 33 158 -12 34 6 29 33 30 25 34 59 45 32 39 0 -111 0 0 33 51 1 3 27 57 33 157 -11 34 9 8 33 33 2 35 2 27 32 41 35 -112 0 0 33 54 7 3 28 10 33 156 -11 34 12 15 33 36 7 35 5 36 32 44 37 -113 0 0 33 57 40 3 28 23 32 156 -10 34 15 49 33 39 39 35 9 14 32 48 7 -114 0 0 34 1 42 3 28 36 32 155 -9 34 19 52 33 43 40 35 13 20 32 52 4 -115 0 0 34 6 11 3 28 49 32 154 -9 34 24 23 33 48 8 35 17 54 32 56 29 -116 0 0 34 11 8 3 29 2 31 153 -8 34 29 21 33 53 4 35 22 57 33 1 21 -117 0 0 34 16 33 3 29 14 31 152 -7 34 34 48 33 58 27 35 28 28 33 6 41 -118 0 0 34 22 26 3 29 27 30 151 -6 34 40 42 34 4 18 35 34 27 33 12 28 -119 0 0 34 28 47 3 29 39 30 150 -6 34 47 4 34 10 37 35 40 54 33 18 42 -120 0 0 34 35 35 3 29 51 29 149 -5 34 53 54 34 17 24 35 47 50 33 25 23 -121 0 0 34 42 51 3 30 3 29 148 -4 35 1 12 34 24 38 35 55 14 33 32 32 -122 0 0 34 50 35 3 30 15 28 147 -3 35 8 58 34 32 19 36 3 6 33 40 8 -123 0 0 34 58 46 3 30 26 28 146 -3 35 17 11 34 40 28 36 11 26 33 48 11 -124 0 0 35 7 24 3 30 38 27 146 -2 35 25 52 34 49 5 36 20 14 33 56 41 -125 0 0 35 16 31 3 30 49 27 145 -1 35 35 1 34 58 9 36 29 30 34 5 39 -126 0 0 35 26 4 3 31 0 26 144 0 35 44 37 35 7 40 36 39 14 34 15 3 -127 0 0 35 36 5 3 31 10 25 143 0 35 54 41 35 17 38 36 49 25 34 24 54 -128 0 0 35 46 34 3 31 21 25 142 1 36 5 12 35 28 4 37 0 5 34 35 12 -129 0 0 35 57 29 3 31 31 24 142 2 36 16 10 35 38 57 37 11 12 34 45 57 -130 0 0 36 8 51 3 31 41 24 141 3 36 27 35 35 50 16 37 22 46 34 57 8 -131 0 0 36 20 41 3 31 51 23 140 4 36 39 28 36 2 2 37 34 48 35 8 46 -132 0 0 36 32 57 3 32 0 22 139 4 36 51 47 36 14 15 37 47 17 35 20 50 -133 0 0 36 45 40 3 32 10 22 139 5 37 4 34 36 26 55 38 0 14 35 33 21 -134 0 0 36 58 49 3 32 19 21 138 6 37 17 46 36 40 1 38 13 37 35 46 18 -135 0 0 37 12 25 3 32 27 20 137 7 37 31 26 36 53 33 38 27 27 35 59 40 -136 0 0 37 26 27 3 32 36 20 136 8 37 45 31 37 7 32 38 41 44 36 13 29 -137 0 0 37 40 55 3 32 44 19 136 8 38 0 3 37 21 56 38 56 28 36 27 43 -138 0 0 37 55 49 3 32 52 18 135 9 38 15 1 37 36 46 39 11 37 36 42 22 -139 0 0 38 11 8 3 32 59 17 134 10 38 30 24 37 52 2 39 27 13 36 57 27 -140 0 0 38 26 53 3 33 7 17 133 11 38 46 13 38 7 43 39 43 14 37 12 57 -141 0 0 38 43 3 3 33 14 16 133 12 39 2 28 38 23 48 39 59 41 37 28 51 -142 0 0 38 59 38 3 33 20 15 132 12 39 19 7 38 40 19 40 16 34 37 45 10 -143 0 0 39 16 38 3 33 27 14 131 13 39 36 11 38 57 14 40 33 51 38 1 54 -144 0 0 39 34 2 3 33 33 14 131 14 39 53 39 39 14 34 40 51 33 38 19 1 -145 0 0 39 51 49 3 33 38 13 130 15 40 11 32 39 32 17 41 9 39 38 36 32 -146 0 0 40 10 1 3 33 44 12 129 16 40 29 48 39 50 24 41 28 10 38 54 26 -147 0 0 40 28 36 3 33 49 11 129 16 40 48 28 40 8 55 41 47 4 39 12 44 -148 0 0 40 47 34 3 33 54 11 128 17 41 7 30 40 27 48 42 6 22 39 31 24 -149 0 0 41 6 54 3 33 58 10 127 18 41 26 56 40 47 3 42 26 2 39 50 26 -150 0 0 41 26 37 3 34 2 9 127 19 41 46 43 41 6 41 42 46 5 40 9 51 -151 0 0 41 46 41 3 34 6 8 126 20 42 6 53 41 26 41 43 6 30 40 29 36 -152 0 0 42 7 7 3 34 9 7 125 20 42 27 24 41 47 1 43 27 17 40 49 43 -153 0 0 42 27 53 3 34 12 7 125 21 42 48 15 42 7 43 43 48 24 41 10 10 -154 0 0 42 49 0 3 34 15 6 124 22 43 9 27 42 28 44 44 9 53 .. .. .. -155 0 0 43 10 27 3 34 17 5 123 23 43 30 59 42 50 6 44 31 41 .. .. .. -156 0 0 43 32 13 3 34 19 4 123 23 43 52 50 43 11 46 44 53 48 .. .. .. -157 0 0 43 54 17 3 34 21 3 122 24 44 15 0 43 33 45 45 16 15 .. .. .. -158 0 0 44 16 39 3 34 22 3 121 25 44 37 28 43 56 3 45 38 59 .. .. .. -159 0 0 44 39 19 3 34 23 2 120 26 45 0 13 44 18 37 46 2 1 .. .. .. -160 0 0 45 2 16 3 34 24 1 120 26 45 23 16 44 41 28 46 25 20 .. .. .. -161 0 0 45 25 29 3 34 24 0 119 27 45 46 34 45 4 36 .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 6243-00231-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 33 03.1987 DE: -19 51 11.075 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .037 ) * V mag [mag]: 12.0 * B mag [mag]: 13.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (495) Eulalia approx. diameter [km]: 39 approx. diameter ["]: .031 distance from Earth [AU]: 1.71800 * orbital information: orbit source: Preston date of fit: 2007 Jul 15 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 834 number of rejected observations: 101 time covered by the observations: 1902 Nov 04 - 2007 May 22 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.026, 91° remarks: * orbital elements for (495) Eulalia : Mean anomaly = 257.90874346 deg Arg. of pericenter = 207.00090418 deg Long. of node = 186.56613271 deg Inclination = 2.27827098 deg Eccentricity = 0.12880254 Semimajor axis = 2.48861311 AU Perihelion dist = 2.16807343 AU Mag: H = 10.79, G = 0.15 Epoch of elements : MJD 54306.14300000 TDT (2007 Jul 25.143) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 25 495 Eulalia 3h 24.2m UT 12.0 17 33 3.199-19 51 11.07TYC 6243-00231-1 13.6 14.7 39 6.4 1.718 -1.247 -1.50 -90.257 -19.852 -229.42 19.75 3.4036 -.06947 .80470 -3.44036 -0.29344 0.00338 -0.00041 2000 256.3665152007 719.00000207.000904186.566133 2.2782710.128802542.488613112.1680734310.75 0.15 RATE 2.5105450 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.050 0.045 90.5 2.450 0.045 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 16, 05:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org