IOTA/IOTA-ES occultation update for (1234) Elyna / TYC 7366-00500-1 event on 2008 May 12, 14:43 UT Visible from Japan Summary ------- On 2008 May 12 UT, the 26 km diameter asteroid (1234) Elyna will occult a 9.8 mag star in the constellation Scorpius for observers along a path across Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 16.5 mag (the magnitude of the asteroid) for at most 2.7 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: 0 * date and approx. time of event: 2008 May 12, 14:37 - 2008 May 12, 14:48 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 2.7 * Moon: 54 % sunlit, 115° distance * Sun: 149° distance * rough path description: Japan The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 0.00 * 1 sigma uncertainty interval [seconds]: +/- 0.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .044", 88° ) * approx speed of asteroid's shadow [km/s]: 9.4733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7366-00500-1 by 1234 Elyna** on 2008 May 12 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 -148 53 15 44 0 0 14 37 32 5 213 0 -149 21 59 -148 24 48 -152 26 0 ... .. .. -150 12 10 43 0 0 14 37 35 7 212 -1 -150 41 14 -149 43 23 -153 47 54 ... .. .. -151 34 40 42 0 0 14 37 39 8 211 -3 -152 4 11 -151 5 28 -155 14 12 ... .. .. -153 1 9 41 0 0 14 37 45 9 210 -4 -153 31 14 -152 31 26 -156 45 28 -149 34 57 -154 32 5 40 0 0 14 37 51 11 209 -6 -155 2 51 -154 1 42 -158 22 21 -151 1 49 -156 8 2 39 0 0 14 37 59 12 208 -7 -156 39 40 -155 36 50 -160 5 43 -152 32 44 -157 49 43 38 0 0 14 38 8 14 207 -9 -158 22 26 -157 17 30 -161 56 43 -154 8 12 -159 38 5 37 0 0 14 38 18 15 206 -10 -160 12 8 -159 4 36 -163 56 55 -155 48 52 -161 34 22 36 0 0 14 38 30 17 204 -12 -162 10 8 -160 59 17 -166 8 33 -157 35 31 -163 40 16 35 0 0 14 38 45 18 203 -14 -164 18 14 -163 3 8 -168 35 0 -159 29 12 Latitude Latitude Latitude Latitude -165 0 0 34 24 36 14 38 54 19 202 -15 34 41 34 34 7 49 36 30 31 32 27 44 -166 0 0 33 59 16 14 39 2 20 201 -16 34 16 3 33 42 39 36 3 43 32 3 34 -167 0 0 33 35 3 14 39 9 21 200 -17 33 51 39 33 18 36 35 38 7 31 40 27 -168 0 0 33 11 55 14 39 17 21 200 -18 33 28 22 32 55 37 35 13 42 31 18 21 -169 0 0 32 49 51 14 39 25 22 199 -19 33 6 9 32 33 43 34 50 27 30 57 16 -170 0 0 32 28 52 14 39 34 22 198 -20 32 45 1 32 12 52 34 28 20 30 37 12 -171 0 0 32 8 56 14 39 42 23 197 -21 32 24 58 31 53 4 34 7 22 30 18 7 -172 0 0 31 50 4 14 39 50 24 196 -21 32 5 58 31 34 18 33 47 30 30 0 3 -173 0 0 31 32 13 14 39 59 24 196 -22 31 48 0 31 16 35 33 28 45 29 42 57 -174 0 0 31 15 24 14 40 8 25 195 -23 31 31 5 30 59 52 33 11 6 29 26 50 -175 0 0 30 59 37 14 40 17 25 194 -24 31 15 11 30 44 11 32 54 31 29 11 42 -176 0 0 30 44 50 14 40 26 25 193 -25 31 0 19 30 29 30 32 39 1 28 57 31 -177 0 0 30 31 4 14 40 35 26 192 -25 30 46 28 30 15 48 32 24 35 28 44 18 -178 0 0 30 18 18 14 40 44 26 191 -26 30 33 37 30 3 7 32 11 12 28 32 3 -179 0 0 30 6 32 14 40 54 27 190 -27 30 21 46 29 51 24 31 58 52 28 20 44 -180 0 0 29 55 44 14 41 3 27 190 -28 30 10 55 29 40 41 31 47 34 28 10 22 179 0 0 29 45 56 14 41 13 27 189 -28 30 1 3 29 30 56 31 37 18 28 0 57 178 0 0 29 37 7 14 41 22 27 188 -29 29 52 11 29 22 10 31 28 4 27 52 28 177 0 0 29 29 16 14 41 32 28 187 -30 29 44 17 29 14 22 31 19 52 27 44 56 176 0 0 29 22 23 14 41 41 28 186 -30 29 37 22 29 7 31 31 12 40 27 38 19 175 0 0 29 16 29 14 41 51 28 185 -31 29 31 25 29 1 39 31 6 29 27 32 38 174 0 0 29 11 32 14 42 1 28 184 -32 29 26 27 28 56 44 31 1 19 27 27 53 173 0 0 29 7 33 14 42 11 28 183 -32 29 22 27 28 52 46 30 57 9 27 24 3 172 0 0 29 4 32 14 42 21 28 182 -33 29 19 24 28 49 46 30 54 0 27 21 9 171 0 0 29 2 28 14 42 30 28 181 -33 29 17 20 28 47 43 30 51 51 27 19 10 170 0 0 29 1 22 14 42 40 29 181 -34 29 16 13 28 46 38 30 50 41 27 18 6 169 0 0 29 1 13 14 42 50 29 180 -34 29 16 5 28 46 29 30 50 32 27 17 58 168 0 0 29 2 2 14 43 0 29 179 -35 29 16 54 28 47 18 30 51 24 27 18 45 167 0 0 29 3 49 14 43 10 28 178 -35 29 18 41 28 49 3 30 53 15 27 20 27 166 0 0 29 6 33 14 43 20 28 177 -36 29 21 26 28 51 46 30 56 6 27 23 5 165 0 0 29 10 14 14 43 29 28 176 -36 29 25 9 28 55 27 30 59 58 27 26 38 164 0 0 29 14 54 14 43 39 28 175 -36 29 29 50 29 0 5 31 4 50 27 31 7 163 0 0 29 20 31 14 43 49 28 174 -37 29 35 29 29 5 40 31 10 43 27 36 31 162 0 0 29 27 6 14 43 59 28 173 -37 29 42 7 29 12 13 31 17 36 27 42 51 161 0 0 29 34 40 14 44 8 28 172 -37 29 49 43 29 19 44 31 25 30 27 50 7 160 0 0 29 43 11 14 44 18 27 171 -38 29 58 18 29 28 13 31 34 26 27 58 19 159 0 0 29 52 42 14 44 27 27 171 -38 30 7 52 29 37 40 31 44 23 28 7 27 158 0 0 30 3 12 14 44 37 27 170 -38 30 18 25 29 48 6 31 55 22 28 17 32 157 0 0 30 14 40 14 44 46 26 169 -38 30 29 58 29 59 30 32 7 24 28 28 33 156 0 0 30 27 9 14 44 55 26 168 -38 30 42 31 30 11 54 32 20 28 28 40 32 155 0 0 30 40 37 14 45 5 26 167 -38 30 56 4 30 25 17 32 34 35 28 53 28 154 0 0 30 55 5 14 45 14 25 166 -38 31 10 38 30 39 41 32 49 46 29 7 21 153 0 0 31 10 34 14 45 23 25 165 -38 31 26 13 30 55 4 33 6 2 29 22 12 152 0 0 31 27 5 14 45 31 24 165 -38 31 42 50 31 11 28 33 23 21 29 38 1 151 0 0 31 44 37 14 45 40 24 164 -38 32 0 29 31 28 54 33 41 47 29 54 49 150 0 0 32 3 11 14 45 49 23 163 -38 32 19 10 31 47 21 34 1 18 30 12 36 149 0 0 32 22 48 14 45 57 23 162 -38 32 38 55 32 6 50 34 21 57 30 31 23 148 0 0 32 43 28 14 46 5 22 161 -38 32 59 43 32 27 22 34 43 43 30 51 9 147 0 0 33 5 12 14 46 13 21 161 -38 33 21 36 32 48 57 35 6 38 31 11 56 146 0 0 33 28 1 14 46 21 21 160 -38 33 44 35 33 11 37 35 30 42 31 33 44 145 0 0 33 51 55 14 46 29 20 159 -37 34 8 39 33 35 21 35 55 56 31 56 33 144 0 0 34 16 55 14 46 37 19 158 -37 34 33 50 34 0 11 36 22 23 32 20 24 143 0 0 34 43 2 14 46 44 19 158 -37 35 0 8 34 26 6 36 50 2 32 45 17 142 0 0 35 10 17 14 46 51 18 157 -36 35 27 35 34 53 9 37 18 54 33 11 14 141 0 0 35 38 40 14 46 58 17 156 -36 35 56 12 35 21 20 37 49 3 33 38 15 140 0 0 36 8 13 14 47 4 16 155 -36 36 25 59 35 50 39 38 20 28 34 6 20 139 0 0 36 38 57 14 47 11 16 155 -35 36 56 57 36 21 9 38 53 11 34 35 30 138 0 0 37 10 52 14 47 17 15 154 -35 37 29 8 36 52 49 39 27 15 35 5 46 137 0 0 37 44 0 14 47 23 14 153 -34 38 2 34 37 25 41 40 2 40 35 37 9 136 0 0 38 18 23 14 47 28 13 152 -33 38 37 14 37 59 46 40 39 30 36 9 39 135 0 0 38 54 1 14 47 33 12 152 -33 39 13 11 38 35 5 41 17 46 36 43 18 134 0 0 39 30 56 14 47 38 11 151 -32 39 50 27 39 11 41 41 57 30 37 18 6 133 0 0 40 9 9 14 47 43 10 150 -32 40 29 3 39 49 33 42 38 47 37 54 4 132 0 0 40 48 43 14 47 47 10 150 -31 41 9 0 40 28 44 43 21 38 38 31 14 131 0 0 41 29 39 14 47 51 9 149 -30 41 50 21 41 9 16 44 6 7 39 9 36 130 0 0 42 11 59 14 47 54 8 148 -29 42 33 9 41 51 9 44 52 18 39 49 11 129 0 0 42 55 45 14 47 57 7 148 -28 43 17 24 42 34 27 45 40 16 40 30 0 128 0 0 43 41 0 14 48 0 6 147 -28 44 3 11 43 19 12 46 30 6 .. .. .. 127 0 0 44 27 46 14 48 2 5 146 -27 44 50 32 44 5 25 47 21 53 .. .. .. 126 0 0 45 16 6 14 48 4 3 146 -26 45 39 30 44 53 10 48 15 44 .. .. .. 125 0 0 46 6 4 14 48 5 2 145 -25 46 30 8 45 42 29 .. .. .. .. .. .. 124 0 0 46 57 43 14 48 6 1 144 -24 47 22 33 46 33 26 .. .. .. .. .. .. 123 0 0 47 51 8 14 48 7 0 143 -23 .. .. .. 47 26 4 .. .. .. .. .. .. Uncertainty in time = +/- 8 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 7366-00500-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 22 45.0719 DE: -32 34 23.132 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .035 ) * V mag [mag]: 9.8 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1234) Elyna approx. diameter [km]: 26 approx. diameter ["]: .016 distance from Earth [AU]: 2.30400 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 717 number of rejected observations: 33 time covered by the observations: 1931 Oct 20 - 2008 Apr 30 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.027, 87° remarks: * orbital elements for (1234) Elyna : Mean anomaly = 228.68481949 deg Arg. of pericenter = 86.55387517 deg Long. of node = 304.80359822 deg Inclination = 8.52488066 deg Eccentricity = 0.09269219 Semimajor axis = 3.01326155 AU Perihelion dist = 2.73395575 AU Mag: H = 10.73, G = 0.15 Epoch of elements : MJD 54598.61300000 TDT (2008 May 12.613) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 12 1234 Elyna** 14h 42.8m UT 9.8 17 22 45.072-32 34 23.13TYC 7366-00500-1 10.4 16.5 26 2.7 2.304 -1.616 0.00 169.2548 -32.572 -41.60 18.33 14.7128 0.00008 0.87762 -5.34702 -0.00238 -0.00276 0.00099 2000 227.0618762008 5 4.00000 86.553875304.803598 8.5248810.09269219 3.0132616 2.733955711.5 5.00.15 RATE 1.8842950 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Assum 0.047 0.044 88 4.085 0.047 0 54594.5020080512_0500-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org