IOTA/IOTA-ES occultation update for (104) Klymene / TYC 6845-00679-1 event on 2012 Oct 19, 08:36 UT Visible from Australia Summary ------- On 2012 Oct 19 UT, the 127 km diameter asteroid (104) Klymene will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 14.8 mag (the magnitude of the asteroid) for at most 4.5 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: 84 * date and approx. time of event: 2012 Oct 19, 08:38 - 2012 Oct 19, 08:40 UT * geocentric midpoint of event [JD]: 2456219.85895833 * magnitude of target star: 11.3 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 4.5 * Moon: 20 % sunlit, 10° distance * Sun: 62° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .028", 90° ) * approx speed of asteroid's shadow [km/s]: 28.4101 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6845-00679-1 by 104 Klymene on 2012 Oct 19 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 ' " Latitude Latitude Latitude Latitude 142 0 0 -27 3 17 8 38 39 61 265 0 -27 38 49 -26 27 48 -28 22 54 -25 43 49 143 0 0 -26 50 6 8 38 42 61 265 -1 -27 25 41 -26 14 33 -28 9 51 -25 30 29 144 0 0 -26 36 30 8 38 45 60 264 -2 -27 12 8 -26 0 53 -27 56 23 -25 16 45 145 0 0 -26 22 29 8 38 48 59 263 -3 -26 58 11 -25 46 48 -27 42 31 -25 2 36 146 0 0 -26 8 4 8 38 52 58 263 -4 -26 43 50 -25 32 20 -27 28 14 -24 48 3 147 0 0 -25 53 15 8 38 55 57 262 -5 -26 29 5 -25 17 27 -27 13 34 -24 33 5 148 0 0 -25 38 1 8 38 58 56 261 -6 -26 13 55 -25 2 9 -26 58 29 -24 17 43 149 0 0 -25 22 23 8 39 1 55 261 -7 -25 58 21 -24 46 27 -26 43 0 -24 1 56 150 0 0 -25 6 22 8 39 4 54 260 -8 -25 42 24 -24 30 22 -26 27 7 -23 45 45 151 0 0 -24 49 56 8 39 7 53 260 -9 -25 26 2 -24 13 52 -26 10 50 -23 29 10 152 0 0 -24 33 6 8 39 10 52 259 -10 -25 9 16 -23 56 58 -25 54 10 -23 12 11 153 0 0 -24 15 52 8 39 13 51 258 -11 -24 52 6 -23 39 40 -25 37 5 -22 54 49 154 0 0 -23 58 15 8 39 16 50 258 -12 -24 34 33 -23 21 58 -25 19 37 -22 37 2 155 0 0 -23 40 14 8 39 19 49 257 -13 -24 16 36 -23 3 53 -25 1 46 -22 18 52 156 0 0 -23 21 50 8 39 22 48 257 -14 -23 58 16 -22 45 25 -24 43 31 -22 0 18 157 0 0 -23 3 2 8 39 25 47 256 -14 -23 39 33 -22 26 33 -24 24 53 -21 41 21 158 0 0 -22 43 51 8 39 27 46 256 -15 -23 20 26 -22 7 18 -24 5 52 -21 22 1 159 0 0 -22 24 18 8 39 30 45 255 -16 -23 0 57 -21 47 40 -23 46 27 -21 2 18 160 0 0 -22 4 21 8 39 33 44 255 -17 -22 41 5 -21 27 40 -23 26 41 -20 42 12 161 0 0 -21 44 3 8 39 36 43 255 -18 -22 20 51 -21 7 17 -23 6 31 -20 21 44 162 0 0 -21 23 22 8 39 38 42 254 -19 -22 0 14 -20 46 32 -22 46 0 -20 0 54 163 0 0 -21 2 19 8 39 41 41 254 -20 -21 39 15 -20 25 25 -22 25 6 -19 39 42 164 0 0 -20 40 54 8 39 44 40 253 -21 -21 17 54 -20 3 56 -22 3 51 -19 18 8 165 0 0 -20 19 8 8 39 46 39 253 -22 -20 56 12 -19 42 6 -21 42 14 -18 56 12 166 0 0 -19 57 1 8 39 49 38 252 -24 -20 34 9 -19 19 54 -21 20 16 -18 33 56 167 0 0 -19 34 32 8 39 51 37 252 -25 -20 11 45 -18 57 22 -20 57 56 -18 11 19 168 0 0 -19 11 44 8 39 54 36 252 -26 -19 49 0 -18 34 29 -20 35 17 -17 48 21 169 0 0 -18 48 35 8 39 56 35 251 -27 -19 25 55 -18 11 17 -20 12 17 -17 25 4 170 0 0 -18 25 6 8 39 58 34 251 -28 -19 2 31 -17 47 44 -19 48 57 -17 1 27 171 0 0 -18 1 18 8 40 0 33 251 -29 -18 38 46 -17 23 53 -19 25 17 -16 37 30 172 0 0 -17 37 11 8 40 3 32 250 -30 -18 14 43 -16 59 42 -19 1 19 -16 13 15 173 0 0 -17 12 46 8 40 5 31 250 -31 -17 50 21 -16 35 13 -18 37 2 -15 48 42 174 0 0 -16 48 2 8 40 7 30 250 -32 -17 25 41 -16 10 26 -18 12 26 -15 23 50 175 0 0 -16 23 1 8 40 9 29 249 -33 -17 0 44 -15 45 21 -17 47 33 -14 58 41 176 0 0 -15 57 43 8 40 11 28 249 -34 -16 35 29 -15 20 0 -17 22 22 -14 33 16 177 0 0 -15 32 8 8 40 13 27 249 -35 -16 9 57 -14 54 21 -16 56 54 -14 7 33 178 0 0 -15 6 17 8 40 15 26 248 -36 -15 44 9 -14 28 27 -16 31 10 -13 41 35 179 0 0 -14 40 10 8 40 17 25 248 -37 -15 18 6 -14 2 17 -16 5 10 -13 15 22 180 0 0 -14 13 49 8 40 18 24 248 -38 -14 51 47 -13 35 53 -15 38 55 -12 48 54 -179 0 0 -13 47 13 8 40 20 23 248 -39 -14 25 14 -13 9 14 -15 12 25 -12 22 12 -178 0 0 -13 20 23 8 40 22 22 247 -40 -13 58 26 -12 42 22 -14 45 42 -11 55 16 -177 0 0 -12 53 20 8 40 23 20 247 -41 -13 31 26 -12 15 16 -14 18 44 -11 28 7 -176 0 0 -12 26 4 8 40 24 19 247 -42 -13 4 12 -11 47 58 -13 51 34 -11 0 46 -175 0 0 -11 58 36 8 40 26 18 247 -44 -12 36 47 -11 20 28 -13 24 11 -10 33 13 -174 0 0 -11 30 57 8 40 27 17 246 -45 -12 9 10 -10 52 47 -12 56 37 -10 5 30 -173 0 0 -11 3 8 8 40 28 16 246 -46 -11 41 22 -10 24 55 -12 28 52 - 9 37 36 -172 0 0 -10 35 8 8 40 30 15 246 -47 -11 13 25 - 9 56 54 -12 0 56 - 9 9 32 -171 0 0 -10 7 0 8 40 31 14 246 -48 -10 45 18 - 9 28 44 -11 32 51 - 8 41 20 -170 0 0 - 9 38 42 8 40 32 13 246 -49 -10 17 2 - 9 0 25 -11 4 38 - 8 13 0 -169 0 0 - 9 10 17 8 40 33 12 246 -50 - 9 48 38 - 8 31 59 -10 36 16 - 7 44 32 -168 0 0 - 8 41 45 8 40 33 11 245 -51 - 9 20 8 - 8 3 26 -10 7 46 - 7 15 57 -167 0 0 - 8 13 7 8 40 34 10 245 -52 - 8 51 30 - 7 34 46 - 9 39 10 - 6 47 17 -166 0 0 - 7 44 23 8 40 35 8 245 -53 - 8 22 47 - 7 6 2 - 9 10 28 - 6 18 31 -165 0 0 - 7 15 35 8 40 35 7 245 -54 - 7 53 59 - 6 37 13 - 8 41 41 - 5 49 41 -164 0 0 - 6 46 42 8 40 36 6 245 -56 - 7 25 7 - 6 8 19 - 8 12 50 - 5 20 47 -163 0 0 - 6 17 46 8 40 36 5 245 -57 - 6 56 12 - 5 39 23 - 7 43 55 - 4 51 51 -162 0 0 - 5 48 48 8 40 37 4 245 -58 - 6 27 14 - 5 10 25 - 7 14 57 - 4 22 52 -161 0 0 - 5 19 48 8 40 37 3 245 -59 - 5 58 14 - 4 41 25 - 6 45 57 - 3 53 52 -160 0 0 - 4 50 47 8 40 37 2 244 -60 - 5 29 13 - 4 12 24 - 6 16 55 - 3 24 52 -159 0 0 - 4 21 46 8 40 37 1 244 -61 - 5 0 11 - 3 43 24 - 5 47 54 - 2 55 51 Uncertainty in time = +/- 4 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6845-00679-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 51 40.0234 DE: -25 38 03.114 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .037, .027 ) * V mag [mag]: 11.3 * B mag [mag]: 13.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (104) Klymene approx. diameter [km]: 127 approx. diameter ["]: .045 distance from Earth [AU]: 3.91600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1192 number of rejected observations: 138 time covered by the observations: 1910 Mar 06 - 2012 Aug 12 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.008, 92° remarks: * orbital elements for (104) Klymene : Mean anomaly = 218.69635811 deg Arg. of pericenter = 31.61056250 deg Long. of node = 41.78914488 deg Inclination = 2.78888332 deg Eccentricity = 0.15573025 Semimajor axis = 3.15077618 AU Perihelion dist = 2.66010502 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 56219.35900000 TDT (2012 Oct 19.359) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 19 104 Klymene 8h 36.9m UT 11.3 17 51 40.023-25 38 3.11TYC 6845-00679-1 13.4 14.8 127 4.5 3.916 2.663 0.15 110.4659 -25.634 47.01 -10.18 8.6150 0.00228 -0.08172 16.03530 0.06530 0.00525 -0.00019 2000 217.04702920121010.00000 31.610562 41.789145 2.7888830.15573025 3.1507762 2.6601050 8.3 5.00.15 RATE 1.7622920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.028 90 1.62 0.028 0 0 4-4 056165.0020121019_0679-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org