IOTA/IOTA-ES occultation update for (505) Cava / 2UCAC 21218097 event on 2008 Oct 13, 03:03 UT Visible from Canada, USA, Mexico, Central America, Chile, Argentina Summary ------- On 2008 Oct 13 UT, the 108 km diameter asteroid (505) Cava will occult a 12.6 mag star in the constellation Piscis Austrinus for observers along a path across Canada, USA, Mexico, Central America, Chile, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 13.2 mag (the magnitude of the asteroid) for at most 34.4 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: 83 * date and approx. time of event: 2008 Oct 13, 02:32 - 2008 Oct 13, 03:35 UT * midpoint of event [JD]: 2454752.62715 * magnitude of target star: 12.6 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 34.4 * Moon: 96 % sunlit, 39° distance * Sun: 120° distance * rough path description: Canada, USA, Mexico, Central America, Chile, Argentina The occultation path -------------------- * approximate projected width [km]: 112 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 20.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .049", 89° ) * approx speed of asteroid's shadow [km/s]: 3.1432 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 21218097 by 505 Cava on 2008 Oct 13 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 19 4 3 -73 46 52 2 32 43 20 243 0 18 31 19 -74 22 38 19 37 58 -73 10 29 17 51 42 -75 6 56 20 22 30 -72 23 41 5 52 4 -74 42 41 2 33 33 23 255 -3 4 59 31 -75 14 51 6 44 5 -74 10 6 3 52 19 -75 54 49 7 49 5 -73 28 24 - 6 24 48 -74 48 15 2 34 22 26 267 -5 - 7 34 25 -75 16 51 - 5 16 51 -74 19 15 - 9 4 51 -75 52 21 - 3 53 19 -73 42 8 - 17 10 54 -74 18 4 2 35 11 29 276 -6 - 18 31 14 -74 43 11 - 15 52 37 -73 52 33 - 20 15 39 -75 14 14 - 14 16 40 -73 19 48 - 26 14 29 -73 23 30 2 36 0 32 285 -8 - 27 39 21 -73 45 24 - 24 51 33 -73 1 9 - 29 29 13 -74 12 23 - 23 9 37 -72 32 23 - 33 42 28 -72 12 58 2 36 50 34 291 -10 - 35 7 36 -72 32 6 - 32 18 58 -71 53 24 - 36 57 14 -72 55 35 - 30 35 55 -71 28 6 - 39 49 50 -70 52 22 2 37 39 36 297 -11 - 41 12 47 -71 9 11 - 38 28 8 -70 35 8 - 42 59 10 -71 29 44 - 36 46 56 -70 12 48 - 44 52 26 -69 25 36 2 38 28 39 301 -13 - 46 12 4 -69 40 29 - 43 33 45 -69 10 19 - 47 53 49 -69 58 38 - 41 55 56 -68 50 28 - 49 4 1 -67 55 12 2 39 17 41 304 -14 - 50 19 57 -68 8 29 - 47 48 49 -67 41 32 - 51 56 39 -68 24 40 - 46 15 4 -67 23 45 - 52 35 35 -66 22 48 2 40 7 43 307 -16 - 53 47 47 -66 34 46 - 51 23 56 -66 10 28 - 55 19 31 -66 49 18 - 49 54 25 -65 54 25 - 55 35 38 -64 49 26 2 40 56 44 309 -17 - 56 44 16 -65 0 18 - 54 27 24 -64 38 14 - 58 11 19 -65 13 29 - 53 2 1 -64 23 38 - 58 10 37 -63 15 48 2 41 45 46 310 -18 - 59 15 57 -63 25 44 - 57 5 35 -63 5 33 - 60 38 42 -63 37 47 - 55 44 6 -62 52 10 - 60 25 29 -61 42 18 2 42 34 48 311 -19 - 61 27 47 -61 51 27 - 59 23 25 -61 32 51 - 62 46 37 -62 2 32 - 58 5 32 -61 20 31 - 62 24 2 -60 9 13 2 43 24 50 312 -21 - 63 23 35 -60 17 42 - 61 24 39 -60 0 28 - 64 38 51 -60 27 58 - 60 10 5 -59 49 1 - 64 9 11 -58 36 43 2 44 13 51 313 -22 - 65 6 13 -58 44 37 - 63 12 16 -58 28 33 - 66 18 17 -58 54 11 - 62 0 43 -58 17 53 - 65 43 13 -57 4 53 2 45 2 53 313 -23 - 66 38 0 -57 12 17 - 64 48 32 -56 57 14 - 67 47 8 -57 21 14 - 63 39 46 -56 47 14 - 67 7 57 -55 33 46 2 45 51 54 313 -24 - 68 0 40 -55 40 43 - 66 15 19 -55 26 34 - 69 7 11 -55 49 9 - 65 9 4 -55 17 9 - 68 24 50 -54 3 23 2 46 41 56 313 -25 - 69 15 41 -54 9 58 - 67 34 3 -53 56 35 - 70 19 48 -54 17 55 - 66 30 7 -53 47 41 - 69 35 2 -52 33 44 2 47 30 57 313 -26 - 70 24 9 -52 39 58 - 68 45 56 -52 27 17 - 71 26 6 -52 47 31 - 67 44 6 -52 18 51 - 70 39 28 -51 4 48 2 48 19 59 313 -27 - 71 27 2 -51 10 44 - 69 51 54 -50 58 40 - 72 26 59 -51 17 54 - 68 52 1 -50 50 37 - 71 38 55 -49 36 33 2 49 8 60 312 -28 - 72 25 3 -49 42 12 - 70 52 47 -49 30 41 - 73 23 12 -49 49 3 - 69 54 39 -49 23 0 - 72 34 2 -48 8 56 2 49 58 61 311 -29 - 73 18 52 -48 14 21 - 71 49 12 -48 3 19 - 74 15 20 -48 20 55 - 70 52 42 -47 55 58 - 73 25 21 -46 41 56 2 50 47 63 310 -30 - 74 8 58 -46 47 8 - 72 41 43 -46 36 32 - 75 3 55 -46 53 26 - 71 46 43 -46 29 28 - 74 13 18 -45 15 29 2 51 36 64 309 -31 - 74 55 49 -45 20 30 - 73 30 46 -45 10 18 - 75 49 21 -45 26 34 - 72 37 10 -45 3 30 - 74 58 16 -43 49 34 2 52 25 65 307 -32 - 75 39 46 -43 54 25 - 74 16 46 -43 44 34 - 76 32 0 -44 0 16 - 73 24 26 -43 37 59 - 75 40 36 -42 24 8 2 53 15 66 305 -33 - 76 21 8 -42 28 49 - 75 0 2 -42 19 17 - 77 12 10 -42 34 28 - 74 8 53 -42 12 56 - 76 20 32 -40 59 7 2 54 4 67 303 -34 - 77 0 11 -41 3 39 - 75 40 50 -40 54 25 - 77 50 7 -41 9 8 - 74 50 47 -40 48 15 - 76 58 19 -39 34 30 2 54 53 68 301 -35 - 77 37 10 -39 38 54 - 76 19 26 -39 29 56 - 78 26 4 -39 44 14 - 75 30 24 -39 23 57 - 77 34 10 -38 10 13 2 55 42 69 299 -36 - 78 12 15 -38 14 30 - 76 56 2 -38 5 46 - 79 0 11 -38 19 41 - 76 7 57 -37 59 57 - 78 8 14 -36 46 14 2 56 32 70 296 -37 - 78 45 37 -36 50 25 - 77 30 49 -36 41 54 - 79 32 41 -36 55 28 - 76 43 36 -36 36 13 - 78 40 42 -35 22 30 2 57 21 71 293 -38 - 79 17 26 -35 26 35 - 78 3 56 -35 18 16 - 80 3 40 -35 31 31 - 77 17 32 -35 12 43 - 79 11 41 -33 58 59 2 58 10 72 289 -39 - 79 47 48 -34 2 59 - 78 35 31 -33 54 50 - 80 33 16 -34 7 48 - 77 49 53 -33 49 24 - 79 41 18 -32 35 38 2 58 59 72 286 -40 - 80 16 52 -32 39 33 - 79 5 42 -32 31 34 - 81 1 36 -32 44 17 - 78 20 47 -32 26 15 - 80 9 40 -31 12 24 2 59 49 73 282 -41 - 80 44 42 -31 16 15 - 79 34 35 -31 8 25 - 81 28 47 -31 20 53 - 78 50 19 -31 3 11 - 80 36 51 -29 49 15 3 0 38 73 277 -41 - 81 11 24 -29 53 1 - 80 2 16 -29 45 20 - 81 54 51 -29 57 35 - 79 18 37 -29 40 11 - 81 2 57 -28 26 8 3 1 27 74 273 -42 - 81 37 3 -28 29 51 - 80 28 49 -28 22 16 - 82 19 56 -28 34 21 - 79 45 45 -28 17 12 - 81 28 2 -27 3 0 3 2 17 74 268 -43 - 82 1 42 -27 6 40 - 80 54 20 -26 59 12 - 82 44 3 -27 11 6 - 80 11 47 -26 54 12 - 81 52 10 -25 39 49 3 3 6 74 263 -44 - 82 25 26 -25 43 27 - 81 18 51 -25 36 4 - 83 7 17 -25 47 49 - 80 36 48 -25 31 8 - 82 15 23 -24 16 33 3 3 55 74 258 -45 - 82 48 17 -24 20 8 - 81 42 26 -24 12 50 - 83 29 40 -24 24 27 - 81 0 50 -24 7 58 - 82 37 45 -22 53 8 3 4 44 74 254 -45 - 83 10 19 -22 56 40 - 82 5 8 -22 49 27 - 83 51 16 -23 0 57 - 81 23 58 -22 44 37 - 82 59 18 -21 29 31 3 5 34 74 249 -46 - 83 31 33 -21 33 2 - 82 27 0 -21 25 52 - 84 12 7 -21 37 17 - 81 46 13 -21 21 5 - 83 20 5 -20 5 40 3 6 23 73 245 -47 - 83 52 2 -20 9 10 - 82 48 4 -20 2 3 - 84 32 14 -20 13 22 - 82 7 38 -19 57 18 - 83 40 6 -18 41 32 3 7 12 73 240 -48 - 84 11 48 -18 45 0 - 83 8 21 -18 37 56 - 84 51 40 -18 49 12 - 82 28 16 -18 33 13 - 83 59 25 -17 17 4 3 8 1 72 237 -48 - 84 30 52 -17 20 31 - 83 27 54 -17 13 29 - 85 10 26 -17 24 41 - 82 48 6 -17 8 46 - 84 18 1 -15 52 12 3 8 51 71 233 -49 - 84 49 16 -15 55 39 - 83 46 43 -15 48 37 - 85 28 33 -15 59 48 - 83 7 12 -15 43 56 - 84 35 57 -14 26 53 3 9 40 70 230 -50 - 85 7 0 -14 30 20 - 84 4 51 -14 23 19 - 85 46 2 -14 34 29 - 83 25 34 -14 18 38 - 84 53 13 -13 1 4 3 10 29 70 227 -50 - 85 24 5 -13 4 31 - 84 22 17 -12 57 30 - 86 2 54 -13 8 40 - 83 43 14 -12 52 50 - 85 9 50 -11 34 42 3 11 18 69 224 -51 - 85 40 33 -11 38 8 - 84 39 3 -11 31 7 - 86 19 10 -11 42 17 - 84 0 11 -11 26 26 - 85 25 47 -10 7 41 3 12 8 68 221 -52 - 85 56 22 -10 11 8 - 84 55 9 -10 4 6 - 86 34 49 -10 15 18 - 84 16 26 - 9 59 24 - 85 41 6 - 8 39 59 3 12 57 67 219 -52 - 86 11 35 - 8 43 27 - 85 10 34 - 8 36 23 - 86 49 53 - 8 47 38 - 84 32 0 - 8 31 40 - 85 55 47 - 7 11 30 3 13 46 65 217 -53 - 86 26 10 - 7 14 59 - 85 25 20 - 7 7 53 - 87 4 21 - 7 19 11 - 84 46 52 - 7 3 8 - 86 9 48 - 5 42 10 3 14 35 64 215 -53 - 86 40 7 - 5 45 41 - 85 39 25 - 5 38 32 - 87 18 13 - 5 49 55 - 85 1 2 - 5 33 45 - 86 23 9 - 4 11 54 3 15 25 63 213 -54 - 86 53 25 - 4 15 27 - 85 52 49 - 4 8 14 - 87 31 28 - 4 19 43 - 85 14 29 - 4 3 24 - 86 35 50 - 2 40 37 3 16 14 62 212 -54 - 87 6 5 - 2 44 11 - 86 5 31 - 2 36 54 - 87 44 5 - 2 48 30 - 85 27 12 - 2 32 1 - 86 47 49 - 1 8 11 3 17 3 60 210 -55 - 87 18 4 - 1 11 49 - 86 17 29 - 1 4 25 - 87 56 4 - 1 16 11 - 85 39 10 - 0 59 29 - 86 59 4 0 25 29 3 17 52 59 209 -55 - 87 29 21 0 21 48 - 86 28 43 0 29 18 - 88 7 23 0 17 22 - 85 50 22 0 34 19 - 87 9 34 2 0 31 3 18 42 58 208 -56 - 87 39 54 1 56 46 - 86 39 10 2 4 24 - 88 18 0 1 52 16 - 86 0 44 2 9 30 - 87 19 17 3 37 2 3 19 31 56 207 -56 - 87 49 41 3 33 14 - 86 48 48 3 41 0 - 88 27 52 3 28 38 - 86 10 15 3 46 12 - 87 28 8 5 15 13 3 20 20 55 206 -56 - 87 58 39 5 11 20 - 86 57 32 5 19 16 - 88 36 58 5 6 38 - 86 18 51 5 24 35 - 87 36 6 6 55 14 3 21 9 53 205 -56 - 88 6 45 6 51 15 - 87 5 21 6 59 22 - 88 45 14 6 46 26 - 86 26 27 7 4 49 - 87 43 4 8 37 15 3 21 59 52 204 -57 - 88 13 53 8 33 10 - 87 12 8 8 41 31 - 88 52 36 8 28 14 - 86 33 0 8 47 6 - 87 48 58 10 21 32 3 22 48 50 203 -57 - 88 20 0 10 17 19 - 87 17 48 10 25 55 - 88 58 58 10 12 14 - 86 38 24 10 31 41 - 87 53 40 12 8 18 3 23 37 48 203 -57 - 88 24 59 12 3 57 - 87 22 15 12 12 50 - 89 4 16 11 58 42 - 86 42 30 12 18 48 - 87 57 4 13 57 53 3 24 26 47 202 -57 - 88 28 41 13 53 22 - 87 25 20 14 2 36 - 89 8 21 13 47 55 - 86 45 9 14 8 47 - 87 58 58 15 50 39 3 25 16 45 202 -57 - 88 30 57 15 45 56 - 87 26 51 15 55 33 - 89 11 4 15 40 15 - 86 46 11 16 2 0 - 87 59 10 17 46 59 3 26 5 43 201 -56 - 88 31 35 17 42 3 - 87 26 36 17 52 8 - 89 12 13 17 36 6 - 86 45 21 17 58 54 - 87 57 23 19 47 27 3 26 54 41 201 -56 - 88 30 18 19 42 15 - 87 24 17 19 52 52 - 89 11 35 19 35 59 - 86 42 21 20 0 0 - 87 53 15 21 52 42 3 27 43 39 201 -56 - 88 26 48 21 47 10 - 87 19 32 21 58 27 - 89 8 49 21 40 32 - 86 36 46 22 6 1 - 87 46 20 24 3 31 3 28 33 37 200 -55 - 88 20 36 23 57 37 - 87 11 51 24 9 40 - 89 3 31 23 50 32 - 86 28 6 24 17 47 - 87 35 57 26 21 1 3 29 22 35 200 -55 - 88 11 7 26 14 38 - 87 0 33 26 27 40 - 88 55 7 26 6 59 - 86 15 35 26 36 26 - 87 21 13 28 46 36 3 30 11 32 200 -54 - 87 57 29 28 39 38 - 86 44 41 28 53 52 - 88 42 48 28 31 16 - 85 58 13 29 3 30 - 87 0 48 31 22 17 3 31 0 30 200 -53 - 87 38 26 31 14 32 - 86 22 49 31 30 23 - 88 25 26 31 5 15 - 85 34 27 31 41 6 - 86 32 36 34 11 0 3 31 50 27 200 -52 - 87 12 3 34 2 12 - 85 52 44 34 20 14 - 88 1 12 33 51 41 - 85 1 51 34 32 30 - 85 53 9 37 17 29 3 32 39 24 201 -50 - 86 35 5 37 7 8 - 85 10 38 37 28 21 - 87 27 11 36 54 49 - 84 16 13 37 42 52 - 84 55 45 40 50 3 3 33 28 20 201 -49 - 85 41 26 40 37 14 - 84 9 14 41 3 36 - 86 37 54 40 22 5 - 83 9 19 41 21 50 - 83 24 57 45 6 43 3 34 17 15 202 -46 - 84 17 17 44 49 8 - 82 31 4 45 25 37 - 85 21 19 44 28 37 - 81 20 37 45 51 31 - 80 23 36 51 7 54 3 35 7 9 204 -43 - 81 35 9 50 34 55 - 79 5 55 51 45 55 - 82 58 53 49 58 43 - 77 15 6 52 44 22 Uncertainty in time = +/- 22 secs [Prediction of 2008 Sep 5.0] Data for the target star ------------------------ * name: 2UCAC 21218097 * constellation : Piscis Austrinus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 52 56.5422 DE: -26 22 45.095 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .048, .047 ) * V mag [mag]: 12.6 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 328.3681796801 DE(deg): -26.3376238936 * Equation of equinoxes (radians) : 0.000048166624353 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (505) Cava approx. diameter [km]: 108 approx. diameter ["]: .082 distance from Earth [AU]: 1.82300 * orbital information: orbit source: Preston date of fit: 2008 Sep 04 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 675 number of rejected observations: 106 time covered by the observations: 1904 Jan 10 - 2008 Aug 06 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.015, 82° remarks: * orbital elements for (505) Cava : Mean anomaly = 301.22373199 deg Arg. of pericenter = 337.16964191 deg Long. of node = 90.92074030 deg Inclination = 9.84013210 deg Eccentricity = 0.24466845 Semimajor axis = 2.68470882 AU Perihelion dist = 2.02784527 AU Mag: H = 8.48, G = -0.03 Epoch of elements : MJD 54752.12800000 TDT (2008 Oct 13.128) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 505 Cava 3h 3.1m UT 12.6 21 52 56.542-26 22 45.102UCAC 21218097 0.0 13.2 108 34.4 1.823 0.010 8.56 -99.5918 -26.382 130.79 -7.88 3.0516 0.27256 -0.00434 0.02359 1.77393 0.00430 0.00227 2000 300.74693920081011.00000337.169642 90.920740 9.8401320.24466845 2.6847088 2.0278453 8.6 5.0-.03 RATE 2.2405690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.049 89 1.63 0.051 0 54714.5020081013_218097 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 17:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org