IOTA/IOTA-ES occultation update for (95) Arethusa / TYC 4915-01270-1 event on 2009 Jun 07, 14:20 UT Visible from Summary ------- On 2009 Jun 07 UT, the 136 km diameter asteroid (95) Arethusa will occult a 9.5 mag star in the constellation Sextans for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 14.0 mag (the magnitude of the asteroid) for at most 7.5 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: 86 * date and approx. time of event: 2009 Jun 07, 14:20 - 2009 Jun 07, 14:25 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 7.5 * Moon: 100 % sunlit, 92° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 147 * 1 sigma uncertainty interval [path widths]: +/- 0.59 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .033", 94° ) * approx speed of asteroid's shadow [km/s]: 18.0985 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4915-01270-1 by 95 Arethusa on 2009 Jun 7 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 43 0 0 -26 45 8 14 20 1 67 14 0 -27 25 8 -26 5 20 -28 12 35 -25 18 36 44 0 0 -26 46 25 14 20 7 67 12 -1 -27 26 25 -26 6 37 -28 13 52 -25 19 53 45 0 0 -26 47 38 14 20 13 67 9 -2 -27 27 37 -26 7 50 -28 15 4 -25 21 6 46 0 0 -26 48 46 14 20 18 67 6 -3 -27 28 45 -26 8 58 -28 16 12 -25 22 14 47 0 0 -26 49 49 14 20 24 67 4 -4 -27 29 48 -26 10 1 -28 17 15 -25 23 17 48 0 0 -26 50 48 14 20 30 67 1 -5 -27 30 47 -26 11 0 -28 18 13 -25 24 16 49 0 0 -26 51 41 14 20 35 67 358 -5 -27 31 40 -26 11 53 -28 19 6 -25 25 10 50 0 0 -26 52 30 14 20 41 67 356 -6 -27 32 29 -26 12 42 -28 19 55 -25 25 59 51 0 0 -26 53 14 14 20 46 67 353 -7 -27 33 13 -26 13 27 -28 20 39 -25 26 43 52 0 0 -26 53 54 14 20 52 67 350 -8 -27 33 53 -26 14 6 -28 21 18 -25 27 23 53 0 0 -26 54 28 14 20 58 67 348 -9 -27 34 27 -26 14 41 -28 21 53 -25 27 57 54 0 0 -26 54 58 14 21 3 67 345 -10 -27 34 57 -26 15 10 -28 22 23 -25 28 27 55 0 0 -26 55 23 14 21 9 66 343 -11 -27 35 22 -26 15 35 -28 22 47 -25 28 52 56 0 0 -26 55 43 14 21 14 66 340 -11 -27 35 42 -26 15 55 -28 23 8 -25 29 12 57 0 0 -26 55 58 14 21 20 66 338 -12 -27 35 57 -26 16 11 -28 23 23 -25 29 28 58 0 0 -26 56 9 14 21 25 66 336 -13 -27 36 7 -26 16 21 -28 23 33 -25 29 38 59 0 0 -26 56 14 14 21 31 65 333 -14 -27 36 13 -26 16 27 -28 23 39 -25 29 44 60 0 0 -26 56 15 14 21 36 65 331 -15 -27 36 14 -26 16 28 -28 23 40 -25 29 44 61 0 0 -26 56 11 14 21 42 64 329 -16 -27 36 10 -26 16 24 -28 23 36 -25 29 40 62 0 0 -26 56 2 14 21 47 64 327 -17 -27 36 1 -26 16 15 -28 23 27 -25 29 31 63 0 0 -26 55 48 14 21 53 63 325 -17 -27 35 47 -26 16 1 -28 23 13 -25 29 18 64 0 0 -26 55 30 14 21 58 63 323 -18 -27 35 29 -26 15 42 -28 22 55 -25 28 59 65 0 0 -26 55 6 14 22 4 62 321 -19 -27 35 5 -26 15 19 -28 22 31 -25 28 36 66 0 0 -26 54 38 14 22 9 62 319 -20 -27 34 37 -26 14 51 -28 22 3 -25 28 7 67 0 0 -26 54 5 14 22 14 61 318 -21 -27 34 4 -26 14 18 -28 21 30 -25 27 34 68 0 0 -26 53 28 14 22 20 60 316 -22 -27 33 27 -26 13 40 -28 20 53 -25 26 56 69 0 0 -26 52 45 14 22 25 60 314 -23 -27 32 44 -26 12 57 -28 20 10 -25 26 14 70 0 0 -26 51 58 14 22 30 59 313 -24 -27 31 57 -26 12 10 -28 19 23 -25 25 26 71 0 0 -26 51 6 14 22 35 58 311 -24 -27 31 5 -26 11 18 -28 18 31 -25 24 34 72 0 0 -26 50 9 14 22 40 58 310 -25 -27 30 8 -26 10 21 -28 17 35 -25 23 37 73 0 0 -26 49 7 14 22 46 57 309 -26 -27 29 7 -26 9 19 -28 16 33 -25 22 35 74 0 0 -26 48 1 14 22 51 56 307 -27 -27 28 1 -26 8 13 -28 15 28 -25 21 29 75 0 0 -26 46 50 14 22 56 56 306 -28 -27 26 50 -26 7 2 -28 14 17 -25 20 18 76 0 0 -26 45 35 14 23 1 55 305 -29 -27 25 35 -26 5 47 -28 13 2 -25 19 2 77 0 0 -26 44 15 14 23 6 54 304 -30 -27 24 15 -26 4 26 -28 11 42 -25 17 42 78 0 0 -26 42 50 14 23 11 53 302 -31 -27 22 50 -26 3 2 -28 10 17 -25 16 17 79 0 0 -26 41 21 14 23 15 53 301 -31 -27 21 21 -26 1 32 -28 8 48 -25 14 47 80 0 0 -26 39 47 14 23 20 52 300 -32 -27 19 47 -25 59 58 -28 7 15 -25 13 13 81 0 0 -26 38 9 14 23 25 51 299 -33 -27 18 9 -25 58 20 -28 5 37 -25 11 35 82 0 0 -26 36 26 14 23 30 50 298 -34 -27 16 26 -25 56 37 -28 3 54 -25 9 52 83 0 0 -26 34 39 14 23 34 50 297 -35 -27 14 39 -25 54 49 -28 2 7 -25 8 4 84 0 0 -26 32 47 14 23 39 49 296 -36 -27 12 48 -25 52 58 -28 0 16 -25 6 12 85 0 0 -26 30 51 14 23 43 48 295 -37 -27 10 52 -25 51 1 -27 58 20 -25 4 16 86 0 0 -26 28 51 14 23 48 47 294 -38 -27 8 52 -25 49 1 -27 56 20 -25 2 15 87 0 0 -26 26 46 14 23 52 46 293 -39 -27 6 47 -25 46 56 -27 54 16 -25 0 10 88 0 0 -26 24 37 14 23 57 45 293 -40 -27 4 38 -25 44 47 -27 52 7 -24 58 1 89 0 0 -26 22 24 14 24 1 45 292 -40 -27 2 25 -25 42 34 -27 49 54 -24 55 47 90 0 0 -26 20 6 14 24 5 44 291 -41 -27 0 8 -25 40 16 -27 47 37 -24 53 29 91 0 0 -26 17 45 14 24 9 43 290 -42 -26 57 47 -25 37 54 -27 45 16 -24 51 7 92 0 0 -26 15 19 14 24 14 42 289 -43 -26 55 21 -25 35 28 -27 42 51 -24 48 41 93 0 0 -26 12 49 14 24 18 41 289 -44 -26 52 52 -25 32 59 -27 40 22 -24 46 11 94 0 0 -26 10 16 14 24 22 40 288 -45 -26 50 18 -25 30 25 -27 37 48 -24 43 37 95 0 0 -26 7 38 14 24 26 40 287 -46 -26 47 41 -25 27 47 -27 35 11 -24 40 59 96 0 0 -26 4 56 14 24 29 39 287 -47 -26 44 59 -25 25 5 -27 32 30 -24 38 17 97 0 0 -26 2 11 14 24 33 38 286 -48 -26 42 14 -25 22 19 -27 29 45 -24 35 31 98 0 0 -25 59 22 14 24 37 37 285 -49 -26 39 25 -25 19 30 -27 26 56 -24 32 42 99 0 0 -25 56 29 14 24 40 36 285 -49 -26 36 32 -25 16 37 -27 24 3 -24 29 48 100 0 0 -25 53 32 14 24 44 35 284 -50 -26 33 35 -25 13 40 -27 21 7 -24 26 51 101 0 0 -25 50 31 14 24 48 34 283 -51 -26 30 35 -25 10 39 -27 18 7 -24 23 50 102 0 0 -25 47 27 14 24 51 33 283 -52 -26 27 31 -25 7 35 -27 15 3 -24 20 46 103 0 0 -25 44 20 14 24 54 33 282 -53 -26 24 24 -25 4 27 -27 11 56 -24 17 38 104 0 0 -25 41 9 14 24 57 32 281 -54 -26 21 13 -25 1 16 -27 8 46 -24 14 26 105 0 0 -25 37 54 14 25 1 31 281 -55 -26 17 59 -24 58 1 -27 5 32 -24 11 12 106 0 0 -25 34 37 14 25 4 30 280 -56 -26 14 41 -24 54 43 -27 2 14 -24 7 53 107 0 0 -25 31 16 14 25 7 29 280 -57 -26 11 20 -24 51 22 -26 58 53 -24 4 32 108 0 0 -25 27 51 14 25 10 28 279 -58 -26 7 56 -24 47 58 -26 55 30 -24 1 7 109 0 0 -25 24 24 14 25 12 27 279 -58 -26 4 29 -24 44 30 -26 52 2 -23 57 39 110 0 0 -25 20 53 14 25 15 26 278 -59 -26 0 58 -24 40 59 -26 48 32 -23 54 8 111 0 0 -25 17 19 14 25 18 25 278 -60 -25 57 25 -24 37 25 -26 44 59 -23 50 34 112 0 0 -25 13 43 14 25 20 25 277 -61 -25 53 48 -24 33 48 -26 41 23 -23 46 57 113 0 0 -25 10 3 14 25 23 24 277 -62 -25 50 9 -24 30 9 -26 37 43 -23 43 17 114 0 0 -25 6 21 14 25 25 23 276 -63 -25 46 27 -24 26 26 -26 34 1 -23 39 34 115 0 0 -25 2 35 14 25 28 22 276 -64 -25 42 42 -24 22 41 -26 30 17 -23 35 49 116 0 0 -24 58 47 14 25 30 21 275 -65 -25 38 54 -24 18 52 -26 26 29 -23 32 0 117 0 0 -24 54 57 14 25 32 20 275 -66 -25 35 4 -24 15 2 -26 22 39 -23 28 10 118 0 0 -24 51 4 14 25 34 19 274 -67 -25 31 11 -24 11 8 -26 18 46 -23 24 16 119 0 0 -24 47 8 14 25 36 18 274 -68 -25 27 15 -24 7 13 -26 14 51 -23 20 20 120 0 0 -24 43 10 14 25 38 17 273 -69 -25 23 17 -24 3 14 -26 10 53 -23 16 22 121 0 0 -24 39 10 14 25 40 16 273 -69 -25 19 17 -23 59 14 -26 6 53 -23 12 21 122 0 0 -24 35 7 14 25 41 16 272 -70 -25 15 15 -23 55 11 -26 2 51 -23 8 18 123 0 0 -24 31 2 14 25 43 15 272 -71 -25 11 10 -23 51 6 -25 58 46 -23 4 13 124 0 0 -24 26 55 14 25 45 14 271 -72 -25 7 3 -23 46 59 -25 54 40 -23 0 6 125 0 0 -24 22 46 14 25 46 13 271 -73 -25 2 54 -23 42 50 -25 50 31 -22 55 56 126 0 0 -24 18 35 14 25 47 12 271 -74 -24 58 43 -23 38 39 -25 46 20 -22 51 45 127 0 0 -24 14 22 14 25 48 11 270 -75 -24 54 30 -23 34 26 -25 42 8 -22 47 32 128 0 0 -24 10 8 14 25 50 10 270 -76 -24 50 16 -23 30 11 -25 37 53 -22 43 17 129 0 0 -24 5 51 14 25 51 9 269 -77 -24 46 0 -23 25 54 -25 33 37 -22 39 0 130 0 0 -24 1 33 14 25 51 8 269 -78 -24 41 42 -23 21 36 -25 29 19 -22 34 42 131 0 0 -23 57 13 14 25 52 7 269 -79 -24 37 22 -23 17 16 -25 25 0 -22 30 22 132 0 0 -23 52 52 14 25 53 6 268 -79 -24 33 1 -23 12 55 -25 20 39 -22 26 0 133 0 0 -23 48 30 14 25 54 5 268 -80 -24 28 38 -23 8 32 -25 16 16 -22 21 38 134 0 0 -23 44 6 14 25 54 5 267 -81 -24 24 15 -23 4 8 -25 11 53 -22 17 13 135 0 0 -23 39 40 14 25 55 4 267 -82 -24 19 49 -22 59 43 -25 7 28 -22 12 48 136 0 0 -23 35 14 14 25 55 3 267 -83 -24 15 23 -22 55 17 -25 3 1 -22 8 22 137 0 0 -23 30 47 14 25 55 2 266 -84 -24 10 56 -22 50 49 -24 58 34 -22 3 54 138 0 0 -23 26 18 14 25 55 1 266 -85 -24 6 27 -22 46 21 -24 54 6 -21 59 25 Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 4915-01270-1 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 38 10.3214 DE: -04 12 27.431 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .032 ) * V mag [mag]: 9.5 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (95) Arethusa approx. diameter [km]: 136 approx. diameter ["]: .057 distance from Earth [AU]: 3.31500 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 715 number of rejected observations: 101 time covered by the observations: 1904 Sep 07 - 2008 Apr 16 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 109° remarks: * orbital elements for (95) Arethusa : Mean anomaly = 130.17506263 deg Arg. of pericenter = 154.91749468 deg Long. of node = 243.12676198 deg Inclination = 12.99731940 deg Eccentricity = 0.14960967 Semimajor axis = 3.06806742 AU Perihelion dist = 2.60905487 AU Mag: H = 7.94, G = 0.15 Epoch of elements : MJD 54989.59800000 TDT (2009 Jun 07.598) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 7 95 Arethusa 14h 20.5m UT 9.5 10 38 10.321- 4 12 27.43TYC 4915-01270-1 11.1 14.0 136 7.5 3.315 1.811 -0.41 48.3043 -4.208 -35.39 22.80 14.3415 -0.00699 -0.38134 10.21411 -0.15432 0.00519 -0.00223 2000 128.4147602009 529.00000154.917495243.126762 12.9973190.14960967 3.0680674 2.6090549 7.8 5.00.15 RATE 1.8340310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.033 94 1.59 0.033 0 54581.5020090607_1270-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org