IOTA/IOTA-ES occultation update for (705) Erminia / 2UCAC 15750818 event on 2008 May 08, 09:48 UT Visible from near Hawaii Summary ------- On 2008 May 08 UT, the 134 km diameter asteroid (705) Erminia will occult a 12.2 mag star in the constellation Centaurus for observers along a path across near Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.9 mag (the magnitude of the asteroid) for at most 9.6 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: 99 * date and approx. time of event: 2008 May 08, 09:45 - 2008 May 08, 09:52 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 9.6 * Moon: 12 % sunlit, 129° distance * Sun: 154° distance * rough path description: near Hawaii The occultation path -------------------- * approximate projected width [km]: 287 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .027", 109° ) * approx speed of asteroid's shadow [km/s]: 13.9381 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 15750818 by 705 Erminia on 2008 May 8 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 160 6 23 47 0 0 9 52 23 0 154 -11 162 18 16 ... .. .. 163 45 52 ... .. .. 160 50 0 46 0 0 9 52 23 1 155 -12 163 1 26 158 43 56 164 28 50 ... .. .. 161 35 59 45 0 0 9 52 23 3 155 -13 163 47 14 159 30 14 165 14 34 ... .. .. 162 24 23 44 0 0 9 52 22 4 156 -14 164 35 42 160 18 44 166 3 11 ... .. .. 163 15 19 43 0 0 9 52 20 5 157 -16 165 26 57 161 9 31 166 54 46 ... .. .. 164 8 51 42 0 0 9 52 18 6 157 -17 166 21 6 162 2 40 167 49 28 160 44 41 165 5 7 41 0 0 9 52 16 7 158 -18 167 18 17 162 58 18 168 47 26 161 40 0 166 4 16 40 0 0 9 52 13 8 159 -19 168 18 43 163 56 31 169 48 53 162 37 47 167 6 30 39 0 0 9 52 10 10 159 -20 169 22 35 164 57 30 170 54 6 163 38 8 168 12 2 38 0 0 9 52 6 11 160 -22 170 30 12 166 1 26 172 3 23 164 41 14 169 21 7 37 0 0 9 52 1 12 161 -23 171 41 54 167 8 32 173 17 10 165 47 17 170 34 8 36 0 0 9 51 56 13 162 -24 172 58 6 168 19 4 174 35 57 166 56 32 171 51 27 35 0 0 9 51 50 15 163 -26 174 19 22 169 33 22 176 0 25 168 9 15 173 13 37 34 0 0 9 51 43 16 164 -27 175 46 23 170 51 50 177 31 25 169 25 48 174 41 16 33 0 0 9 51 36 17 165 -29 177 20 4 172 14 58 179 10 9 170 46 36 176 15 16 32 0 0 9 51 27 18 166 -31 179 1 40 173 43 24 -179 1 45 172 12 11 177 56 45 31 0 0 9 51 18 20 167 -32 -179 7 6 175 17 56 -177 1 51 173 43 12 179 47 18 30 0 0 9 51 7 21 168 -34 -177 3 38 176 59 37 -174 46 21 175 20 32 -178 10 48 29 0 0 9 50 54 22 170 -36 -174 43 52 178 49 57 -172 8 33 177 5 20 Latitude Latitude Latitude Latitude -178 0 0 28 54 59 9 50 53 22 170 -36 30 26 33 27 28 25 31 28 16 26 35 16 -177 0 0 28 28 0 9 50 47 23 171 -37 29 58 20 27 2 29 30 59 7 26 9 55 -176 0 0 28 2 28 9 50 40 24 172 -38 29 31 40 26 37 55 30 31 37 25 45 54 -175 0 0 27 38 22 9 50 33 24 172 -38 29 6 31 26 14 42 30 5 41 25 23 12 -174 0 0 27 15 39 9 50 27 25 173 -39 28 42 51 25 52 49 29 41 18 25 1 47 -173 0 0 26 54 20 9 50 20 25 174 -40 28 20 38 25 32 15 29 18 26 24 41 39 -172 0 0 26 34 21 9 50 13 25 175 -41 27 59 50 25 12 59 28 57 3 24 22 47 -171 0 0 26 15 43 9 50 6 26 176 -41 27 40 27 24 55 0 28 37 7 24 5 10 -170 0 0 25 58 24 9 49 59 26 177 -42 27 22 27 24 38 16 28 18 37 23 48 47 -169 0 0 25 42 23 9 49 53 27 177 -43 27 5 49 24 22 47 28 1 31 23 33 37 -168 0 0 25 27 39 9 49 46 27 178 -43 26 50 31 24 8 33 27 45 49 23 19 39 -167 0 0 25 14 12 9 49 39 27 179 -44 26 36 33 23 55 32 27 31 29 23 6 54 -166 0 0 25 2 0 9 49 31 27 180 -44 26 23 54 23 43 44 27 18 30 22 55 20 -165 0 0 24 51 4 9 49 24 27 181 -45 26 12 33 23 33 9 27 6 52 22 44 56 -164 0 0 24 41 21 9 49 17 28 182 -45 26 2 30 23 23 45 26 56 33 22 35 44 -163 0 0 24 32 53 9 49 10 28 183 -46 25 53 43 23 15 33 26 47 33 22 27 41 -162 0 0 24 25 39 9 49 3 28 183 -46 25 46 13 23 8 32 26 39 51 22 20 48 -161 0 0 24 19 37 9 48 56 28 184 -47 25 39 59 23 2 42 26 33 28 22 15 4 -160 0 0 24 14 49 9 48 49 28 185 -47 25 35 0 22 58 2 26 28 22 22 10 29 -159 0 0 24 11 13 9 48 42 28 186 -47 25 31 17 22 54 33 26 24 33 22 7 4 -158 0 0 24 8 49 9 48 35 28 187 -48 25 28 49 22 52 14 26 22 2 22 4 47 -157 0 0 24 7 38 9 48 28 28 188 -48 25 27 35 22 51 5 26 20 47 22 3 39 -156 0 0 24 7 40 9 48 21 27 189 -48 25 27 37 22 51 6 26 20 49 22 3 40 -155 0 0 24 8 54 9 48 14 27 189 -48 25 28 54 22 52 17 26 22 8 22 4 50 -154 0 0 24 11 20 9 48 7 27 190 -48 25 31 26 22 54 38 26 24 44 22 7 8 -153 0 0 24 14 59 9 48 0 27 191 -48 25 35 14 22 58 10 26 28 38 22 10 36 -152 0 0 24 19 51 9 47 53 27 192 -48 25 40 17 23 2 52 26 33 49 22 15 12 -151 0 0 24 25 56 9 47 46 26 193 -48 25 46 35 23 8 45 26 40 17 22 20 58 -150 0 0 24 33 15 9 47 39 26 194 -48 25 54 11 23 15 50 26 48 4 22 27 54 -149 0 0 24 41 47 9 47 33 26 194 -48 26 3 2 23 24 5 26 57 10 22 36 0 -148 0 0 24 51 34 9 47 26 25 195 -48 26 13 12 23 33 33 27 7 35 22 45 16 -147 0 0 25 2 36 9 47 20 25 196 -48 26 24 39 23 44 13 27 19 21 22 55 43 -146 0 0 25 14 54 9 47 13 24 197 -48 26 37 25 23 56 5 27 32 28 23 7 22 -145 0 0 25 28 28 9 47 7 24 198 -47 26 51 30 24 9 12 27 46 56 23 20 12 -144 0 0 25 43 19 9 47 0 23 198 -47 27 6 56 24 23 32 28 2 48 23 34 15 -143 0 0 25 59 28 9 46 54 23 199 -47 27 23 44 24 39 8 28 20 3 23 49 32 -142 0 0 26 16 55 9 46 48 22 200 -46 27 41 54 24 55 59 28 38 45 24 6 2 -141 0 0 26 35 43 9 46 42 22 201 -46 28 1 29 25 14 7 28 58 53 24 23 47 -140 0 0 26 55 52 9 46 36 21 201 -45 28 22 28 25 33 32 29 20 29 24 42 47 -139 0 0 27 17 24 9 46 31 20 202 -45 28 44 55 25 54 17 29 43 36 25 3 5 -138 0 0 27 40 19 9 46 25 20 203 -44 29 8 50 26 16 21 30 8 15 25 24 40 -137 0 0 28 4 40 9 46 20 19 203 -44 29 34 15 26 39 46 30 34 29 25 47 34 -136 0 0 28 30 28 9 46 14 18 204 -43 30 1 13 27 4 34 31 2 19 26 11 48 -135 0 0 28 57 44 9 46 9 18 205 -42 30 29 46 27 30 46 31 31 49 26 37 24 -134 0 0 29 26 32 9 46 4 17 205 -42 30 59 56 27 58 24 32 3 2 27 4 22 -133 0 0 29 56 52 9 45 59 16 206 -41 31 31 47 28 27 29 32 36 0 27 32 45 -132 0 0 30 28 48 9 45 55 15 207 -40 32 5 20 28 58 4 33 10 47 28 2 34 -131 0 0 31 2 22 9 45 51 14 207 -39 32 40 40 29 30 10 33 47 28 28 33 51 -130 0 0 31 37 36 9 45 46 13 208 -38 33 17 51 30 3 49 34 26 8 29 6 38 -129 0 0 32 14 35 9 45 42 12 208 -38 33 56 56 30 39 5 35 6 51 29 40 57 -128 0 0 32 53 22 9 45 39 11 209 -37 34 38 1 31 16 0 35 49 44 30 16 51 -127 0 0 33 34 0 9 45 35 10 210 -36 35 21 11 31 54 37 36 34 53 30 54 22 -126 0 0 34 16 35 9 45 32 9 210 -35 36 6 32 32 34 59 37 22 28 31 33 32 -125 0 0 35 1 10 9 45 29 8 211 -34 36 54 13 33 17 10 38 12 38 32 14 25 -124 0 0 35 47 53 9 45 27 7 212 -33 37 44 21 34 1 14 39 5 34 32 57 4 -123 0 0 36 36 49 9 45 24 6 212 -32 38 37 6 34 47 16 40 1 31 33 41 34 -122 0 0 37 28 6 9 45 22 5 213 -30 39 32 41 35 35 20 41 0 45 34 27 58 -121 0 0 38 21 54 9 45 21 4 213 -29 40 31 20 36 25 34 42 3 39 35 16 20 -120 0 0 39 18 22 9 45 20 3 214 -28 41 33 21 37 18 2 .. .. .. 36 6 47 -119 0 0 40 17 43 9 45 19 1 215 -27 .. .. .. 38 12 54 .. .. .. .. .. .. -118 0 0 41 20 12 9 45 19 0 215 -26 .. .. .. 39 10 19 .. .. .. .. .. .. Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: 2UCAC 15750818 * constellation : Centaurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 51 20.0942 DE: -37 48 16.902 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .023 ) * V mag [mag]: 12.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (705) Erminia approx. diameter [km]: 134 approx. diameter ["]: .090 distance from Earth [AU]: 2.06300 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 683 number of rejected observations: 48 time covered by the observations: 1910 Oct 06 - 2008 Apr 13 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.016, 134° remarks: * orbital elements for (705) Erminia : Mean anomaly = 120.29962864 deg Arg. of pericenter = 97.22438497 deg Long. of node = 3.02198919 deg Inclination = 25.01239103 deg Eccentricity = 0.05165081 Semimajor axis = 2.92278309 AU Perihelion dist = 2.77181899 AU Mag: H = 8.43, G = 0.15 Epoch of elements : MJD 54594.40900000 TDT (2008 May 08.409) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 8 705 Erminia 9h 48.9m UT 12.2 13 51 20.094-37 48 16.902UCAC 15750818 0.0 12.9 134 9.6 2.063 -2.814 3.33 -165.9777 -37.805 31.91 17.25 9.8143 0.08719 0.87972 -7.82835 0.77911 0.00169 0.00184 2000 119.4299692008 5 4.00000 97.224385 3.021989 25.0123910.05165081 2.9227831 2.7718190 8.4 5.00.15 RATE 1.9724650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.027 109 1.32 0.029 0 54579.5020080508_750818 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 04:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org