IOTA/IOTA-ES occultation update for (2375) Radek / TYC 1898-03090-1 event on 2009 Apr 05, 14:09 UT Visible from Summary ------- On 2009 Apr 05 UT, the 25 km diameter asteroid (2375) Radek will occult a 10.1 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 16.4 mag (the magnitude of the asteroid) for at most 1.5 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: 20 * date and approx. time of event: 2009 Apr 05, 14:10 - 2009 Apr 05, 14:16 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 1.5 * Moon: 81 % sunlit, 43° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 3.42 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .041", 74° ) * approx speed of asteroid's shadow [km/s]: 16.3571 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1898-03090-1 by 2375 Radek on 2009 Apr 5 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 65 0 0 44 37 58 14 10 50 70 204 -1 44 30 51 44 45 6 43 42 18 45 33 57 66 0 0 44 39 41 14 10 54 69 206 -1 44 32 34 44 46 49 43 44 2 45 35 39 67 0 0 44 41 3 14 10 59 69 209 -2 44 33 56 44 48 10 43 45 24 45 36 59 68 0 0 44 42 2 14 11 4 69 211 -3 44 34 55 44 49 9 43 46 24 45 37 58 69 0 0 44 42 39 14 11 9 68 213 -3 44 35 33 44 49 46 43 47 2 45 38 35 70 0 0 44 42 55 14 11 14 68 216 -4 44 35 49 44 50 2 43 47 18 45 38 50 71 0 0 44 42 49 14 11 19 67 218 -5 44 35 42 44 49 56 43 47 11 45 38 45 72 0 0 44 42 21 14 11 23 67 220 -6 44 35 15 44 49 28 43 46 43 45 38 17 73 0 0 44 41 32 14 11 28 66 222 -6 44 34 25 44 48 39 43 45 53 45 37 28 74 0 0 44 40 21 14 11 33 66 224 -7 44 33 14 44 47 28 43 44 41 45 36 18 75 0 0 44 38 47 14 11 38 65 226 -8 44 31 40 44 45 55 43 43 7 45 34 46 76 0 0 44 36 53 14 11 43 65 228 -8 44 29 45 44 44 0 43 41 10 45 32 52 77 0 0 44 34 36 14 11 47 64 229 -9 44 27 28 44 41 43 43 38 52 45 30 37 78 0 0 44 31 57 14 11 52 64 231 -10 44 24 50 44 39 5 43 36 12 45 28 0 79 0 0 44 28 57 14 11 57 63 233 -10 44 21 49 44 36 5 43 33 9 45 25 2 80 0 0 44 25 34 14 12 1 63 235 -11 44 18 26 44 32 43 43 29 45 45 21 42 81 0 0 44 21 50 14 12 6 62 236 -12 44 14 42 44 28 59 43 25 58 45 18 0 82 0 0 44 17 44 14 12 11 62 238 -13 44 10 35 44 24 53 43 21 49 45 13 57 83 0 0 44 13 15 14 12 15 61 239 -13 44 6 6 44 20 25 43 17 17 45 9 31 84 0 0 44 8 25 14 12 20 60 241 -14 44 1 15 44 15 35 43 12 24 45 4 44 85 0 0 44 3 13 14 12 24 60 242 -15 43 56 2 44 10 23 43 7 8 44 59 35 86 0 0 43 57 38 14 12 29 59 244 -15 43 50 27 44 4 49 43 1 29 44 54 5 87 0 0 43 51 41 14 12 34 59 245 -16 43 44 30 43 58 53 42 55 29 44 48 12 88 0 0 43 45 22 14 12 38 58 246 -17 43 38 10 43 52 34 42 49 5 44 41 57 89 0 0 43 38 40 14 12 43 57 248 -18 43 31 28 43 45 53 42 42 19 44 35 20 90 0 0 43 31 36 14 12 47 57 249 -18 43 24 24 43 38 50 42 35 11 44 28 20 91 0 0 43 24 10 14 12 52 56 250 -19 43 16 57 43 31 24 42 27 40 44 20 59 92 0 0 43 16 21 14 12 56 55 251 -20 43 9 7 43 23 35 42 19 46 44 13 15 93 0 0 43 8 9 14 13 1 55 253 -20 43 0 55 43 15 25 42 11 29 44 5 9 94 0 0 42 59 35 14 13 5 54 254 -21 42 52 20 43 6 51 42 2 49 43 56 40 95 0 0 42 50 38 14 13 9 53 255 -22 42 43 22 42 57 55 41 53 47 43 47 48 96 0 0 42 41 18 14 13 14 53 256 -23 42 34 1 42 48 36 41 44 21 43 38 34 97 0 0 42 31 36 14 13 18 52 257 -23 42 24 18 42 38 54 41 34 32 43 28 58 98 0 0 42 21 30 14 13 23 51 258 -24 42 14 11 42 28 49 41 24 20 43 18 58 99 0 0 42 11 1 14 13 27 51 259 -25 42 3 42 42 18 21 41 13 45 43 8 36 100 0 0 42 0 9 14 13 31 50 260 -25 41 52 49 42 7 30 41 2 47 42 57 51 101 0 0 41 48 54 14 13 35 49 262 -26 41 41 33 41 56 15 40 51 25 42 46 42 102 0 0 41 37 16 14 13 40 49 263 -27 41 29 54 41 44 38 40 39 40 42 35 11 103 0 0 41 25 14 14 13 44 48 264 -28 41 17 51 41 32 37 40 27 31 42 23 16 104 0 0 41 12 49 14 13 48 47 265 -28 41 5 25 41 20 13 40 14 59 42 10 59 105 0 0 41 0 1 14 13 52 46 265 -29 40 52 36 41 7 25 40 2 4 41 58 17 106 0 0 40 46 49 14 13 56 46 266 -30 40 39 23 40 54 14 39 48 44 41 45 13 107 0 0 40 33 13 14 14 0 45 267 -30 40 25 47 40 40 40 39 35 1 41 31 45 108 0 0 40 19 14 14 14 5 44 268 -31 40 11 47 40 26 42 39 20 55 41 17 54 109 0 0 40 4 51 14 14 9 43 269 -32 39 57 23 40 12 20 39 6 24 41 3 39 110 0 0 39 50 5 14 14 13 42 270 -33 39 42 36 39 57 35 38 51 30 40 49 1 111 0 0 39 34 55 14 14 17 42 271 -33 39 27 24 39 42 26 38 36 12 40 33 58 112 0 0 39 19 21 14 14 20 41 272 -34 39 11 50 39 26 53 38 20 30 40 18 33 113 0 0 39 3 24 14 14 24 40 273 -35 38 55 51 39 10 57 38 4 25 40 2 44 114 0 0 38 47 2 14 14 28 39 273 -36 38 39 29 38 54 36 37 47 55 39 46 31 115 0 0 38 30 18 14 14 32 38 274 -36 38 22 43 38 37 53 37 31 2 39 29 54 116 0 0 38 13 9 14 14 36 38 275 -37 38 5 33 38 20 45 37 13 46 39 12 54 117 0 0 37 55 37 14 14 39 37 276 -38 37 48 0 38 3 14 36 56 5 38 55 30 118 0 0 37 37 41 14 14 43 36 277 -39 37 30 3 37 45 19 36 38 1 38 37 43 119 0 0 37 19 22 14 14 47 35 277 -39 37 11 43 37 27 1 36 19 33 38 19 32 120 0 0 37 0 39 14 14 50 34 278 -40 36 52 59 37 8 19 36 0 42 38 0 57 121 0 0 36 41 32 14 14 54 33 279 -41 36 33 51 36 49 14 35 41 28 37 41 59 122 0 0 36 22 3 14 14 57 33 280 -41 36 14 21 36 29 45 35 21 50 37 22 38 123 0 0 36 2 10 14 15 1 32 280 -42 35 54 27 36 9 53 35 1 49 37 2 54 124 0 0 35 41 54 14 15 4 31 281 -43 35 34 10 35 49 39 34 41 25 36 42 46 125 0 0 35 21 15 14 15 7 30 282 -44 35 13 30 35 29 1 34 20 38 36 22 15 126 0 0 35 0 14 14 15 10 29 282 -44 34 52 27 35 8 0 33 59 28 36 1 22 127 0 0 34 38 49 14 15 13 28 283 -45 34 31 2 34 46 37 33 37 56 35 40 6 128 0 0 34 17 3 14 15 17 27 284 -46 34 9 15 34 24 52 33 16 2 35 18 27 129 0 0 33 54 54 14 15 20 26 284 -47 33 47 5 34 2 44 32 53 45 34 56 27 130 0 0 33 32 24 14 15 22 26 285 -47 33 24 33 33 40 14 32 31 7 34 34 4 131 0 0 33 9 31 14 15 25 25 286 -48 33 1 40 33 17 23 32 8 7 34 11 19 132 0 0 32 46 18 14 15 28 24 286 -49 32 38 25 32 54 10 31 44 46 33 48 13 133 0 0 32 22 43 14 15 31 23 287 -49 32 14 50 32 30 36 31 21 4 33 24 45 134 0 0 31 58 47 14 15 33 22 287 -50 31 50 53 32 6 42 30 57 2 33 0 57 135 0 0 31 34 31 14 15 36 21 288 -51 31 26 37 31 42 27 30 32 39 32 36 48 136 0 0 31 9 55 14 15 38 20 289 -51 31 2 0 31 17 51 30 7 57 32 12 19 137 0 0 30 45 0 14 15 40 19 289 -52 30 37 3 30 52 57 29 42 55 31 47 30 138 0 0 30 19 45 14 15 43 18 290 -53 30 11 48 30 27 43 29 17 33 31 22 21 139 0 0 29 54 11 14 15 45 17 290 -53 29 46 13 30 2 10 28 51 54 30 56 54 140 0 0 29 28 19 14 15 47 16 291 -54 29 20 20 29 36 18 28 25 56 30 31 7 141 0 0 29 2 9 14 15 49 15 291 -54 28 54 10 29 10 9 27 59 41 30 5 3 142 0 0 28 35 42 14 15 50 14 292 -55 28 27 42 28 43 43 27 33 8 29 38 41 143 0 0 28 8 58 14 15 52 13 292 -55 28 0 57 28 16 59 27 6 20 29 12 2 144 0 0 27 41 58 14 15 54 12 293 -56 27 33 57 27 50 0 26 39 15 28 45 7 145 0 0 27 14 42 14 15 55 11 293 -57 27 6 40 27 22 44 26 11 54 28 17 56 146 0 0 26 47 11 14 15 57 10 294 -57 26 39 9 26 55 14 25 44 19 27 50 29 147 0 0 26 19 26 14 15 58 9 294 -57 26 11 23 26 27 29 25 16 30 27 22 47 148 0 0 25 51 26 14 15 59 8 295 -58 25 43 23 25 59 30 24 48 27 26 54 52 149 0 0 25 23 14 14 16 0 7 295 -58 25 15 10 25 31 18 24 20 12 26 26 43 150 0 0 24 54 49 14 16 1 6 295 -59 24 46 45 25 2 54 23 51 44 25 58 21 151 0 0 24 26 13 14 16 1 5 296 -59 24 18 8 24 34 18 23 23 5 25 29 47 152 0 0 23 57 25 14 16 2 4 296 -59 23 49 20 24 5 30 .. .. .. 25 1 1 153 0 0 23 28 27 14 16 3 3 297 -60 23 20 22 23 36 32 .. .. .. 24 32 5 154 0 0 22 59 19 14 16 3 2 297 -60 22 51 14 23 7 25 .. .. .. 24 2 59 155 0 0 22 30 3 14 16 3 1 297 -60 22 21 58 22 38 9 .. .. .. 23 33 44 Uncertainty in time = +/- 6 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1898-03090-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 50 37.9419 DE: +25 36 08.016 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 10.1 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2375) Radek approx. diameter [km]: 25 approx. diameter ["]: .012 distance from Earth [AU]: 2.95900 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 566 number of rejected observations: 27 time covered by the observations: 1937 Jun 12 - 2008 Mar 09 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.037, 72° remarks: * orbital elements for (2375) Radek : Mean anomaly = 292.65988638 deg Arg. of pericenter = 102.01800985 deg Long. of node = 110.81731365 deg Inclination = 14.99336810 deg Eccentricity = 0.21563935 Semimajor axis = 3.17568792 AU Perihelion dist = 2.49088463 AU Mag: H = 10.47, G = 0.15 Epoch of elements : MJD 54926.59000000 TDT (2009 Apr 05.590) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 5 2375 Radek 14h 9.9m UT 10.1 6 50 37.942 25 36 8.02TYC 1898-03090-1 11.9 16.4 25 1.5 2.959 2.017 2.99 56.1768 25.602 -31.80 6.27 14.1646 -0.03486 0.31031 9.17739 1.00647 0.00574 -0.00048 2000 291.5121742009 330.00000102.018010110.817314 14.9933680.21563935 3.1756879 2.490884610.6 5.00.15 RATE 1.7415960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.041 74 4.42 0.040 0 54581.5020090405_3090-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org