IOTA/IOTA-ES occultation update for (224) Oceana / TYC 6342-01372-1 event on 2012 Oct 31, 20:18 UT Visible from Europe Summary ------- On 2012 Oct 31 UT, the 54 km diameter asteroid (224) Oceana will occult a 11.5 mag star in the constellation Capricornus for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.6 mag (the magnitude of the asteroid) for at most 2.8 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: 42 * date and approx. time of event: 2012 Oct 31, 20:19 - 2012 Oct 31, 20:22 UT * geocentric midpoint of event [JD]: 2456232.34619167 * magnitude of target star: 11.5 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 2.8 * Moon: 96 % sunlit, 114° distance * Sun: 88° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 78 * 1 sigma uncertainty interval [path widths]: +/- 1.54 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .033", 359° ) * approx speed of asteroid's shadow [km/s]: 19.1590 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6342-01372-1 by 224 Oceana on 2012 Oct 31 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 - 45 0 0 25 26 17 20 19 17 43 168 -1 25 2 16 25 50 30 23 49 28 27 6 25 - 44 0 0 25 56 54 20 19 23 42 169 -2 25 32 44 26 21 16 24 19 30 27 37 41 - 43 0 0 26 28 12 20 19 29 42 170 -3 26 3 53 26 52 44 24 50 12 28 9 39 - 42 0 0 27 0 11 20 19 35 42 172 -4 26 35 42 27 24 52 25 21 34 28 42 18 - 41 0 0 27 32 49 20 19 41 41 173 -5 27 8 11 27 57 40 25 53 35 29 15 38 - 40 0 0 28 6 7 20 19 47 41 174 -6 27 41 19 28 31 8 26 26 15 29 49 38 - 39 0 0 28 40 3 20 19 53 40 176 -7 28 15 5 29 5 14 26 59 32 30 24 17 - 38 0 0 29 14 36 20 19 59 40 177 -8 28 49 28 29 39 58 27 33 26 30 59 35 - 37 0 0 29 49 46 20 20 4 39 178 -9 29 24 28 30 15 18 28 7 55 31 35 29 - 36 0 0 30 25 31 20 20 10 39 179 -10 30 0 2 30 51 13 28 43 0 32 11 59 - 35 0 0 31 1 50 20 20 15 38 181 -11 30 36 11 31 27 43 29 18 38 32 49 5 - 34 0 0 31 38 42 20 20 21 38 182 -12 31 12 53 32 4 47 29 54 49 33 26 44 - 33 0 0 32 16 7 20 20 26 37 183 -13 31 50 7 32 42 22 30 31 31 34 4 55 - 32 0 0 32 54 2 20 20 32 36 184 -14 32 27 51 33 20 28 31 8 44 34 43 38 - 31 0 0 33 32 26 20 20 37 35 185 -15 33 6 4 33 59 4 31 46 26 35 22 50 - 30 0 0 34 11 18 20 20 42 35 186 -16 33 44 45 34 38 7 32 24 35 36 2 31 - 29 0 0 34 50 37 20 20 47 34 188 -16 34 23 53 35 17 37 33 3 11 36 42 38 - 28 0 0 35 30 20 20 20 52 33 189 -17 35 3 25 35 57 32 33 42 11 37 23 11 - 27 0 0 36 10 27 20 20 57 32 190 -18 35 43 21 36 37 50 34 21 35 38 4 7 - 26 0 0 36 50 56 20 21 1 32 191 -19 36 23 39 37 18 30 35 1 20 38 45 24 - 25 0 0 37 31 44 20 21 6 31 192 -20 37 4 16 37 59 30 35 41 25 39 27 2 - 24 0 0 38 12 51 20 21 11 30 193 -21 37 45 11 38 40 48 36 21 49 40 8 58 - 23 0 0 38 54 13 20 21 15 29 194 -22 38 26 23 39 22 22 37 2 29 40 51 9 - 22 0 0 39 35 51 20 21 19 28 195 -22 39 7 50 40 4 11 37 43 24 41 33 35 - 21 0 0 40 17 41 20 21 23 27 196 -23 39 49 29 40 46 12 38 24 32 42 16 13 - 20 0 0 40 59 41 20 21 27 26 197 -24 40 31 18 41 28 23 39 5 51 42 59 2 - 19 0 0 41 41 50 20 21 31 26 198 -25 41 13 17 42 10 43 39 47 19 43 41 58 - 18 0 0 42 24 5 20 21 35 25 198 -25 41 55 22 42 53 9 40 28 55 44 24 59 - 17 0 0 43 6 25 20 21 38 24 199 -26 42 37 31 43 35 39 41 10 35 45 8 4 - 16 0 0 43 48 47 20 21 41 23 200 -27 43 19 44 44 18 11 41 52 19 45 51 11 - 15 0 0 44 31 9 20 21 45 22 201 -27 44 1 56 45 0 44 42 34 4 46 34 16 - 14 0 0 45 13 29 20 21 48 21 202 -28 44 44 7 45 43 13 43 15 48 47 17 19 - 13 0 0 45 55 45 20 21 51 20 203 -29 45 26 14 46 25 39 43 57 30 48 0 15 - 12 0 0 46 37 55 20 21 53 19 204 -29 46 8 15 47 7 57 44 39 6 48 43 4 - 11 0 0 47 19 56 20 21 56 18 205 -30 46 50 8 47 50 7 45 20 36 49 25 43 - 10 0 0 48 1 47 20 21 59 17 205 -30 47 31 51 48 32 6 46 1 56 50 8 9 - 9 0 0 48 43 25 20 22 1 16 206 -31 48 13 22 49 13 52 46 43 6 50 50 21 - 8 0 0 49 24 49 20 22 3 16 207 -31 48 54 38 49 55 23 47 24 3 51 32 17 - 7 0 0 50 5 55 20 22 5 15 208 -32 49 35 39 50 36 37 48 4 44 52 13 53 - 6 0 0 50 46 43 20 22 7 14 209 -32 50 16 21 51 17 31 48 45 10 52 55 8 - 5 0 0 51 27 11 20 22 9 13 210 -33 50 56 43 51 58 4 49 25 16 53 36 0 - 4 0 0 52 7 16 20 22 10 12 210 -33 51 36 43 52 38 14 50 5 2 54 16 28 - 3 0 0 52 46 56 20 22 12 11 211 -33 52 16 19 53 17 59 50 44 26 54 56 28 - 2 0 0 53 26 11 20 22 13 10 212 -34 52 55 30 53 57 17 51 23 27 55 36 0 - 1 0 0 54 4 57 20 22 15 9 213 -34 53 34 13 54 36 7 52 2 2 56 15 1 0 0 0 54 43 15 20 22 16 8 214 -34 54 12 28 55 14 27 52 40 10 56 53 30 1 0 0 55 21 2 20 22 17 8 215 -34 54 50 13 55 52 16 53 17 49 57 31 25 2 0 0 55 58 16 20 22 18 7 215 -35 55 27 26 56 29 32 53 54 59 58 8 46 3 0 0 56 34 57 20 22 18 6 216 -35 56 4 7 57 6 14 54 31 38 58 45 30 4 0 0 57 11 4 20 22 19 5 217 -35 56 40 14 57 42 20 55 7 45 59 21 36 5 0 0 57 46 35 20 22 19 4 218 -35 57 15 45 58 17 50 .. .. .. 59 57 4 6 0 0 58 21 29 20 22 20 4 219 -35 57 50 41 58 52 43 .. .. .. 60 31 53 7 0 0 58 55 46 20 22 20 3 220 -35 58 24 59 59 26 58 .. .. .. 61 6 0 8 0 0 59 29 24 20 22 21 2 221 -35 58 58 40 60 0 33 .. .. .. 61 39 27 9 0 0 60 2 23 20 22 21 1 221 -35 59 31 43 60 33 29 .. .. .. .. .. .. 10 0 0 60 34 43 20 22 21 1 222 -35 60 4 6 61 5 45 .. .. .. .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 6342-01372-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 39 28.5100 DE: -20 58 38.777 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .049 ) * V mag [mag]: 11.5 * B mag [mag]: 12.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (224) Oceana approx. diameter [km]: 54 approx. diameter ["]: .031 distance from Earth [AU]: 2.40500 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 966 number of rejected observations: 116 time covered by the observations: 1910 Dec 21 - 2012 Oct 14 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.009, 70° remarks: * orbital elements for (224) Oceana : Mean anomaly = 50.48553467 deg Arg. of pericenter = 281.93118985 deg Long. of node = 352.90198910 deg Inclination = 5.83793784 deg Eccentricity = 0.04455170 Semimajor axis = 2.64460794 AU Perihelion dist = 2.52678616 AU Mag: H = 8.50, G = 0.15 Epoch of elements : MJD 56231.84600000 TDT (2012 Oct 31.846) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 31 224 Oceana 20h 18.5m UT 11.5 20 39 28.510-20 58 38.78TYC 6342-01372-1 12.6 13.6 54 2.8 2.405 2.599 15.46 -35.2951 -20.981 -128.73 -14.44 20.3086 -0.28072 0.66236 9.95323 4.22763 0.00555 0.00146 2000 50.06248320121030.00000281.931190352.901989 5.8379380.04455170 2.6446079 2.5267862 8.6 5.00.15 RATE 2.2917230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.033 359 2.54 0.048 0 0 0 3 056226.0020121031_1372-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org