IOTA/IOTA-ES occultation update for (224) Oceana / 2UCAC 28472061 event on 2008 Oct 12, 16:15 UT Visible from Japan, China, Russia, Europe Summary ------- On 2008 Oct 12 UT, the 58 km diameter asteroid (224) Oceana will occult a 12.8 mag star in the constellation Aquarius for observers along a path across Japan, China, Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.8 mag (the magnitude of the asteroid) for at most 15.4 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: 42 * date and approx. time of event: 2008 Oct 12, 15:56 - 2008 Oct 12, 16:32 UT * midpoint of event [JD]: 2454752.17698333 * magnitude of target star: 12.8 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 15.4 * Moon: 94 % sunlit, 15° distance * Sun: 136° distance * rough path description: Japan, China, Russia, Europe The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 1.57 * 1 sigma uncertainty interval [seconds]: +/- 24.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .073 +/- .071) * 1 sigma uncertainty ellipse (major, minor, PA): ( .073", .071", 87° ) * approx speed of asteroid's shadow [km/s]: 3.7942 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 28472061 by 224 Oceana on 2008 Oct 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 ' " Latitude Latitude Latitude Latitude 8 0 0 54 41 48 16 32 38 9 120 0 55 7 51 54 16 0 56 31 16 52 56 27 9 0 0 54 29 19 16 32 34 9 121 -1 54 55 22 54 3 30 56 18 51 52 43 53 10 0 0 54 16 42 16 32 30 10 122 -1 54 42 47 53 50 52 56 6 18 52 31 14 11 0 0 54 3 59 16 32 25 10 122 -2 54 30 4 53 38 9 55 53 38 52 18 29 12 0 0 53 51 10 16 32 20 11 123 -2 54 17 16 53 25 19 55 40 52 52 5 37 13 0 0 53 38 15 16 32 14 12 124 -3 54 4 22 53 12 24 55 27 59 51 52 40 14 0 0 53 25 14 16 32 9 12 125 -3 53 51 21 52 59 22 55 15 0 51 39 37 15 0 0 53 12 8 16 32 3 13 126 -4 53 38 15 52 46 16 55 1 56 51 26 30 16 0 0 52 58 56 16 31 56 13 127 -5 53 25 4 52 33 4 54 48 46 51 13 17 17 0 0 52 45 40 16 31 49 14 127 -5 53 11 47 52 19 47 54 35 30 50 59 59 18 0 0 52 32 18 16 31 42 15 128 -6 52 58 26 52 6 25 54 22 9 50 46 37 19 0 0 52 18 52 16 31 35 15 129 -6 52 45 0 51 52 59 54 8 43 50 33 11 20 0 0 52 5 22 16 31 28 16 130 -7 52 31 30 51 39 29 53 55 13 50 19 41 21 0 0 51 51 48 16 31 20 16 131 -7 52 17 55 51 25 54 53 41 38 50 6 7 22 0 0 51 38 9 16 31 11 17 131 -8 52 4 17 51 12 16 53 28 0 49 52 30 23 0 0 51 24 28 16 31 3 18 132 -9 51 50 35 50 58 35 53 14 17 49 38 49 24 0 0 51 10 43 16 30 54 18 133 -9 51 36 50 50 44 51 53 0 31 49 25 6 25 0 0 50 56 55 16 30 45 19 134 -10 51 23 2 50 31 3 52 46 41 49 11 20 26 0 0 50 43 5 16 30 35 19 135 -10 51 9 11 50 17 14 52 32 49 48 57 32 27 0 0 50 29 12 16 30 25 20 136 -11 50 55 18 50 3 21 52 18 54 48 43 41 28 0 0 50 15 18 16 30 15 21 136 -12 50 41 22 49 49 27 52 4 56 48 29 49 29 0 0 50 1 21 16 30 5 21 137 -12 50 27 25 49 35 31 51 50 57 48 15 55 30 0 0 49 47 23 16 29 54 22 138 -13 50 13 26 49 21 34 51 36 55 48 2 0 31 0 0 49 33 24 16 29 43 22 139 -14 49 59 26 49 7 36 51 22 52 47 48 4 32 0 0 49 19 23 16 29 31 23 140 -14 49 45 25 48 53 36 51 8 48 47 34 8 33 0 0 49 5 22 16 29 19 24 141 -15 49 31 23 48 39 36 50 54 43 47 20 11 34 0 0 48 51 21 16 29 7 24 142 -15 49 17 20 48 25 36 50 40 37 47 6 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35 54 7 149 0 0 37 41 32 15 56 59 8 251 -49 38 6 15 37 17 3 39 25 14 36 1 24 150 0 0 37 49 13 15 56 54 7 252 -48 38 13 57 37 24 41 39 33 3 36 8 57 151 0 0 37 57 9 15 56 50 7 253 -47 38 21 55 37 32 35 39 41 7 .. .. .. 152 0 0 38 5 20 15 56 46 6 253 -46 38 30 9 37 40 45 39 49 28 .. .. .. 153 0 0 38 13 48 15 56 43 5 254 -46 38 38 38 37 49 10 39 58 4 .. .. .. 154 0 0 38 22 30 15 56 40 4 254 -45 38 47 23 37 57 51 40 6 56 .. .. .. 155 0 0 38 31 28 15 56 37 4 255 -44 38 56 23 38 6 46 40 16 3 .. .. .. 156 0 0 38 40 42 15 56 36 3 256 -44 39 5 38 38 15 57 40 25 26 .. .. .. 157 0 0 38 50 10 15 56 34 2 256 -43 39 15 9 38 25 24 40 35 4 .. .. .. 158 0 0 38 59 53 15 56 33 1 257 -42 39 24 54 38 35 5 40 44 57 .. .. .. 159 0 0 39 9 51 15 56 33 0 257 -41 39 34 55 38 45 0 .. .. .. .. .. .. Uncertainty in time = +/- 25 secs [Prediction of 2008 Sep 11.0] Data for the target star ------------------------ * name: 2UCAC 28472061 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 31 22.9603 DE: -09 33 03.580 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .069, .069 ) * V mag [mag]: 12.8 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 337.9682524370 DE(deg): -9.5038403604 * Equation of equinoxes (radians) : 0.000048451057647 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (224) Oceana approx. diameter [km]: 58 approx. diameter ["]: .045 distance from Earth [AU]: 1.79500 * orbital information: orbit source: Preston date of fit: 2008 Sep 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 663 number of rejected observations: 116 time covered by the observations: 1910 Dec 21 - 2008 Aug 27 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.015, 62° remarks: * orbital elements for (224) Oceana : Mean anomaly = 70.98114462 deg Arg. of pericenter = 282.30473966 deg Long. of node = 352.91922000 deg Inclination = 5.83865208 deg Eccentricity = 0.04580622 Semimajor axis = 2.64447287 AU Perihelion dist = 2.52333956 AU Mag: H = 8.47, G = 0.15 Epoch of elements : MJD 54751.67700000 TDT (2008 Oct 12.677) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 12 224 Oceana 16h 14.9m UT 12.8 22 31 22.960- 9 33 3.582UCAC 28472061 0.0 12.8 58 15.4 1.795 -0.698 1.72 72.5223 -9.550 -67.13 -7.71 16.2476 0.12331 0.74478 -2.11265 0.35069 0.00365 0.00146 2000 70.59679420081011.00000282.304740352.919220 5.8386520.04580622 2.6444729 2.5233396 8.6 5.00.15 RATE 2.2918980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.073 0.071 87 2.57 0.071 0 54720.5020081012_472061 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 16:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org