IOTA/IOTA-ES occultation update for (1441) Bolyai / TYC 0515-01950-1 event on 2009 Oct 09, 01:16 UT Visible from Summary ------- On 2009 Oct 09 UT, the 15 km diameter asteroid (1441) Bolyai will occult a 10.0 mag star in the constellation Delphinus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.6 mag (the magnitude of the asteroid) for at most 1.8 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: 12 * date and approx. time of event: 2009 Oct 09, 01:08 - 2009 Oct 09, 01:26 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 1.8 * Moon: 75 % sunlit, 119° distance * Sun: 115° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 5.72 * 1 sigma uncertainty interval [seconds]: +/- 9.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .087 +/- .076) * 1 sigma uncertainty ellipse (major, minor, PA): ( .093", .069", 59° ) * approx speed of asteroid's shadow [km/s]: 8.0896 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0515-01950-1 by 1441 Bolyai on 2009 Oct 9 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 -120 0 0 58 14 16 1 8 33 28 140 0 58 8 32 58 19 59 57 3 43 59 26 8 -119 0 0 58 0 11 1 8 38 29 141 -1 57 54 27 58 5 56 56 49 26 59 12 17 -118 0 0 57 45 45 1 8 43 29 142 -1 57 40 0 57 51 31 56 34 48 58 58 5 -117 0 0 57 30 58 1 8 48 30 143 -2 57 25 12 57 36 45 56 19 48 58 43 31 -116 0 0 57 15 50 1 8 54 30 144 -2 57 10 3 57 21 38 56 4 27 58 28 36 -115 0 0 57 0 20 1 8 59 31 145 -3 56 54 31 57 6 9 55 48 44 58 13 19 -114 0 0 56 44 28 1 9 5 31 146 -3 56 38 38 56 50 17 55 32 39 57 57 40 -113 0 0 56 28 14 1 9 11 32 147 -4 56 22 23 56 34 4 55 16 12 57 41 39 -112 0 0 56 11 37 1 9 17 32 148 -4 56 5 46 56 17 29 54 59 23 57 25 17 -111 0 0 55 54 39 1 9 23 33 149 -5 55 48 46 56 0 32 54 42 12 57 8 31 -110 0 0 55 37 18 1 9 29 33 150 -5 55 31 25 55 43 12 54 24 39 56 51 24 -109 0 0 55 19 35 1 9 36 34 151 -6 55 13 40 55 25 30 54 6 43 56 33 54 -108 0 0 55 1 29 1 9 43 34 152 -7 54 55 34 55 7 25 53 48 25 56 16 1 -107 0 0 54 43 1 1 9 49 35 153 -7 54 37 4 54 48 58 53 29 45 55 57 46 -106 0 0 54 24 10 1 9 56 36 154 -8 54 18 13 54 30 8 53 10 41 55 39 8 -105 0 0 54 4 57 1 10 4 36 156 -8 53 58 58 54 10 56 52 51 16 55 20 8 -104 0 0 53 45 21 1 10 11 37 157 -9 53 39 21 53 51 21 52 31 28 55 0 44 -103 0 0 53 25 22 1 10 18 37 158 -10 53 19 21 53 31 23 52 11 17 54 40 58 -102 0 0 53 5 0 1 10 26 38 159 -10 52 58 59 53 11 3 51 50 45 54 20 48 -101 0 0 52 44 17 1 10 34 38 160 -11 52 38 14 52 50 20 51 29 49 54 0 16 -100 0 0 52 23 10 1 10 42 39 161 -12 52 17 7 52 29 14 51 8 32 53 39 22 - 99 0 0 52 1 42 1 10 50 39 163 -12 51 55 37 52 7 46 50 46 53 53 18 4 - 98 0 0 51 39 51 1 10 59 40 164 -13 51 33 46 51 45 56 50 24 51 52 56 25 - 97 0 0 51 17 38 1 11 7 40 165 -14 51 11 32 51 23 44 50 2 28 52 34 22 - 96 0 0 50 55 3 1 11 16 41 166 -14 50 48 56 51 1 10 49 39 44 52 11 58 - 95 0 0 50 32 7 1 11 25 41 168 -15 50 25 59 50 38 15 49 16 38 51 49 11 - 94 0 0 50 8 49 1 11 34 42 169 -16 50 2 40 50 14 58 48 53 11 51 26 3 - 93 0 0 49 45 10 1 11 44 42 170 -16 49 39 1 49 51 19 48 29 23 51 2 33 - 92 0 0 49 21 10 1 11 53 43 172 -17 49 15 0 49 27 20 48 5 15 50 38 42 - 91 0 0 48 56 50 1 12 3 43 173 -18 48 50 40 49 3 1 47 40 47 50 14 30 - 90 0 0 48 32 10 1 12 13 44 175 -19 48 25 59 48 38 21 47 15 59 49 49 58 - 89 0 0 48 7 10 1 12 23 44 176 -19 48 0 58 48 13 22 46 50 53 49 25 5 - 88 0 0 47 41 51 1 12 33 45 177 -20 47 35 39 47 48 3 46 25 27 48 59 53 - 87 0 0 47 16 13 1 12 44 45 179 -21 47 10 0 47 22 26 45 59 43 48 34 22 - 86 0 0 46 50 17 1 12 55 46 180 -22 46 44 4 46 56 30 45 33 42 48 8 31 - 85 0 0 46 24 3 1 13 5 46 182 -23 46 17 50 46 30 17 45 7 23 47 42 23 - 84 0 0 45 57 32 1 13 16 47 183 -23 45 51 19 46 3 47 44 40 48 47 15 57 - 83 0 0 45 30 45 1 13 28 47 185 -24 45 24 31 45 37 0 44 13 57 46 49 14 - 82 0 0 45 3 43 1 13 39 47 187 -25 44 57 28 45 9 58 43 46 51 46 22 14 - 81 0 0 44 36 25 1 13 51 48 188 -26 44 30 10 44 42 40 43 19 31 45 54 59 - 80 0 0 44 8 53 1 14 2 48 190 -27 44 2 38 44 15 8 42 51 57 45 27 30 - 79 0 0 43 41 7 1 14 14 48 192 -28 43 34 52 43 47 23 42 24 10 44 59 46 - 78 0 0 43 13 9 1 14 26 49 193 -29 43 6 54 43 19 24 41 56 11 44 31 48 - 77 0 0 42 44 59 1 14 38 49 195 -29 42 38 44 42 51 14 41 28 0 44 3 38 - 76 0 0 42 16 38 1 14 51 49 197 -30 42 10 23 42 22 53 40 59 39 43 35 17 - 75 0 0 41 48 6 1 15 3 49 198 -31 41 41 52 41 54 22 40 31 9 43 6 45 - 74 0 0 41 19 26 1 15 16 50 200 -32 41 13 11 41 25 41 40 2 30 42 38 3 - 73 0 0 40 50 37 1 15 28 50 202 -33 40 44 23 40 56 53 39 33 44 42 9 12 - 72 0 0 40 21 42 1 15 41 50 204 -34 40 15 27 40 27 57 39 4 51 41 40 13 - 71 0 0 39 52 40 1 15 54 50 205 -35 39 46 26 39 58 54 38 35 52 41 11 8 - 70 0 0 39 23 32 1 16 7 50 207 -36 39 17 19 39 29 47 38 6 48 40 41 56 - 69 0 0 38 54 21 1 16 20 50 209 -37 38 48 8 39 0 35 37 37 41 40 12 40 - 68 0 0 38 25 6 1 16 33 50 211 -38 38 18 53 38 31 20 37 8 32 39 43 20 - 67 0 0 37 55 50 1 16 47 50 213 -39 37 49 37 38 2 3 36 39 21 39 13 58 - 66 0 0 37 26 32 1 17 0 50 215 -40 37 20 20 37 32 45 36 10 9 38 44 33 - 65 0 0 36 57 14 1 17 13 50 216 -41 36 51 3 37 3 26 35 40 58 38 15 9 - 64 0 0 36 27 58 1 17 27 50 218 -42 36 21 47 36 34 10 35 11 49 37 45 45 - 63 0 0 35 58 44 1 17 40 50 220 -43 35 52 34 36 4 55 34 42 43 37 16 23 - 62 0 0 35 29 34 1 17 53 50 222 -44 35 23 24 35 35 44 34 13 41 36 47 4 - 61 0 0 35 0 28 1 18 7 49 223 -45 34 54 19 35 6 37 33 44 43 36 17 49 - 60 0 0 34 31 27 1 18 20 49 225 -46 34 25 19 34 37 36 33 15 52 35 48 39 - 59 0 0 34 2 33 1 18 34 49 227 -47 33 56 26 34 8 41 32 47 7 35 19 35 - 58 0 0 33 33 47 1 18 47 48 228 -48 33 27 41 33 39 54 32 18 31 34 50 38 - 57 0 0 33 5 10 1 19 1 48 230 -49 32 59 5 33 11 16 31 50 4 34 21 50 - 56 0 0 32 36 43 1 19 14 48 232 -50 32 30 38 32 42 48 31 21 47 33 53 12 - 55 0 0 32 8 27 1 19 27 47 233 -51 32 2 23 32 14 31 30 53 42 33 24 44 - 54 0 0 31 40 22 1 19 41 47 235 -52 31 34 19 31 46 26 30 25 49 32 56 28 - 53 0 0 31 12 31 1 19 54 46 236 -53 31 6 29 31 18 33 29 58 9 32 28 24 - 52 0 0 30 44 53 1 20 7 46 238 -54 30 38 52 30 50 55 29 30 43 32 0 35 - 51 0 0 30 17 31 1 20 20 45 239 -55 30 11 31 30 23 32 29 3 33 31 33 0 - 50 0 0 29 50 24 1 20 33 45 240 -56 29 44 25 29 56 24 28 36 39 31 5 40 - 49 0 0 29 23 35 1 20 46 44 242 -57 29 17 37 29 29 33 28 10 1 30 38 37 - 48 0 0 28 57 3 1 20 58 44 243 -58 28 51 6 29 3 0 27 43 42 30 11 52 - 47 0 0 28 30 49 1 21 11 43 244 -59 28 24 53 28 36 46 27 17 41 29 45 25 - 46 0 0 28 4 55 1 21 23 42 246 -60 27 59 0 28 10 51 26 52 0 29 19 17 - 45 0 0 27 39 21 1 21 35 42 247 -61 27 33 27 27 45 16 26 26 39 28 53 30 - 44 0 0 27 14 8 1 21 47 41 248 -61 27 8 16 27 20 2 26 1 39 28 28 3 - 43 0 0 26 49 17 1 21 59 40 249 -62 26 43 26 26 55 9 25 37 1 28 2 59 - 42 0 0 26 24 49 1 22 11 39 250 -63 26 18 58 26 30 40 25 12 45 27 38 16 - 41 0 0 26 0 43 1 22 23 39 251 -64 25 54 54 26 6 33 24 48 53 27 13 57 - 40 0 0 25 37 2 1 22 34 38 252 -65 25 31 13 25 42 51 24 25 24 26 50 1 - 39 0 0 25 13 44 1 22 45 37 253 -66 25 7 57 25 19 32 24 2 20 26 26 31 - 38 0 0 24 50 52 1 22 56 36 254 -67 24 45 6 24 56 39 23 39 41 26 3 25 - 37 0 0 24 28 26 1 23 7 35 255 -68 24 22 41 24 34 12 23 17 28 25 40 45 - 36 0 0 24 6 26 1 23 17 35 256 -69 24 0 42 24 12 10 22 55 40 25 18 31 - 35 0 0 23 44 52 1 23 28 34 256 -70 23 39 9 23 50 36 22 34 19 24 56 44 - 34 0 0 23 23 46 1 23 38 33 257 -70 23 18 4 23 29 28 22 13 26 24 35 24 - 33 0 0 23 3 7 1 23 47 32 258 -71 22 57 26 23 8 49 21 53 0 24 14 33 - 32 0 0 22 42 57 1 23 57 31 259 -72 22 37 17 22 48 37 21 33 1 23 54 9 - 31 0 0 22 23 15 1 24 6 30 259 -73 22 17 36 22 28 54 21 13 31 23 34 14 - 30 0 0 22 4 1 1 24 15 29 260 -73 21 58 23 22 9 40 20 54 30 23 14 48 - 29 0 0 21 45 17 1 24 24 29 261 -74 21 39 40 21 50 55 20 35 58 22 55 52 - 28 0 0 21 27 3 1 24 33 28 261 -74 21 21 27 21 32 39 20 17 55 22 37 25 - 27 0 0 21 9 18 1 24 41 27 262 -75 21 3 43 21 14 54 20 0 22 22 19 29 - 26 0 0 20 52 4 1 24 49 26 262 -75 20 46 30 20 57 39 19 43 19 22 2 2 - 25 0 0 20 35 20 1 24 57 25 263 -76 20 29 46 20 40 54 19 26 46 21 45 7 - 24 0 0 20 19 6 1 25 4 24 264 -76 20 13 34 20 24 39 19 10 43 21 28 42 - 23 0 0 20 3 24 1 25 11 23 264 -76 19 57 52 20 8 56 18 55 11 21 12 49 - 22 0 0 19 48 12 1 25 18 22 265 -76 19 42 42 19 53 44 18 40 9 20 57 26 - 21 0 0 19 33 32 1 25 25 21 265 -76 19 28 2 19 39 2 18 25 39 20 42 36 - 20 0 0 19 19 23 1 25 31 20 266 -76 19 13 54 19 24 53 18 11 40 20 28 17 - 19 0 0 19 5 46 1 25 37 19 266 -76 19 0 17 19 11 15 17 58 12 20 14 29 - 18 0 0 18 52 40 1 25 43 18 266 -76 18 47 12 18 58 8 17 45 15 20 1 14 - 17 0 0 18 40 6 1 25 48 17 267 -76 18 34 39 18 45 33 17 32 50 19 48 31 - 16 0 0 18 28 4 1 25 53 16 267 -75 18 22 38 18 33 31 17 20 56 19 36 20 - 15 0 0 18 16 34 1 25 58 15 268 -75 18 11 8 18 22 0 17 9 34 19 24 41 - 14 0 0 18 5 35 1 26 3 15 268 -74 18 0 11 18 11 1 16 58 44 19 13 35 - 13 0 0 17 55 9 1 26 7 14 268 -74 17 49 45 18 0 34 16 48 25 19 3 0 - 12 0 0 17 45 15 1 26 11 13 269 -73 17 39 51 17 50 39 16 38 38 18 52 59 - 11 0 0 17 35 53 1 26 15 12 269 -72 17 30 30 17 41 17 16 29 23 18 43 29 - 10 0 0 17 27 3 1 26 18 11 269 -72 17 21 41 17 32 26 16 20 40 18 34 33 - 9 0 0 17 18 46 1 26 21 10 270 -71 17 13 24 17 24 8 16 12 29 18 26 8 - 8 0 0 17 11 0 1 26 24 9 270 -70 17 5 38 17 16 22 16 4 49 18 18 16 - 7 0 0 17 3 47 1 26 26 8 270 -70 16 58 25 17 9 8 15 57 41 18 10 57 - 6 0 0 16 57 5 1 26 29 7 271 -69 16 51 45 17 2 26 .. .. .. 18 4 10 - 5 0 0 16 50 56 1 26 31 6 271 -68 16 45 36 16 56 17 .. .. .. 17 57 56 - 4 0 0 16 45 19 1 26 32 5 271 -67 16 39 59 16 50 39 .. .. .. 17 52 13 - 3 0 0 16 40 13 1 26 33 4 271 -66 16 34 54 16 45 33 .. .. .. 17 47 3 - 2 0 0 16 35 40 1 26 34 3 272 -65 16 30 21 16 41 0 .. .. .. 17 42 26 - 1 0 0 16 31 39 1 26 35 2 272 -65 16 26 20 16 36 58 .. .. .. 17 38 20 0 0 0 16 28 9 1 26 36 1 272 -64 16 22 50 16 33 28 .. .. .. 17 34 47 1 0 0 16 25 11 1 26 36 0 273 -63 16 19 52 16 30 30 .. .. .. 17 31 46 Uncertainty in time = +/- 12 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0515-01950-1 * constellation : Delphinus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 38 28.4468 DE: +02 30 16.508 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 10.0 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1441) Bolyai approx. diameter [km]: 15 approx. diameter ["]: .015 distance from Earth [AU]: 1.42300 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 601 number of rejected observations: 23 time covered by the observations: 1937 Nov 27 - 2008 Mar 10 1 sigma uncertainty ellipse (major, minor, PA): 0.091, 0.066, 57° remarks: * orbital elements for (1441) Bolyai : Mean anomaly = 341.76335775 deg Arg. of pericenter = 115.01994461 deg Long. of node = 254.34519993 deg Inclination = 13.90678312 deg Eccentricity = 0.23830092 Semimajor axis = 2.63211259 AU Perihelion dist = 2.00487773 AU Mag: H = 13.04, G = 0.15 Epoch of elements : MJD 55113.05300000 TDT (2009 Oct 09.053) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 9 1441 Bolyai 1h 16.5m UT 10.0 20 38 28.447 2 30 16.51TYC 0515-01950-1 10.5 16.6 15 1.8 1.423 1.729 -11.20 -87.3005 2.509 157.72 -6.25 1.2747 0.25279 0.58677 4.19056 -1.81319 0.00479 0.00046 2000 341.058707200910 6.00000115.019945254.345200 13.9067830.23830092 2.6321126 2.004877713.1 5.00.15 RATE 2.3080610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.093 0.069 59 6.72 0.083 0 54581.5020091009_1950-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org