IOTA/IOTA-ES occultation update for (2601) Bologna / TYC 1889-00340-1 event on 2008 Dec 04, 18:05 UT Visible from Australia Summary ------- On 2008 Dec 04 UT, the 19 km diameter asteroid (2601) Bologna will occult a 8.9 mag star in the constellation Auriga for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.7 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: 4 * date and approx. time of event: 2008 Dec 04, 17:59 - 2008 Dec 04, 18:10 UT * magnitude of target star: 8.9 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 1.7 * Moon: 39 % sunlit, 122° distance * Sun: 160° distance * rough path description: Australia Additional comments ------------------- 0.4" double m8.9/9.5 The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 15.97 * 1 sigma uncertainty interval [seconds]: +/- 24.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .217 +/- .207) * 1 sigma uncertainty ellipse (major, minor, PA): ( .217", .207", 92° ) * approx speed of asteroid's shadow [km/s]: 11.2837 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1889-00340-1 by 2601 Bologna on 2008 Dec 4 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 ' " Longitude Longitude Longitude Longitude 55 57 5 -49 0 0 18 10 54 0 43 -14 55 40 5 56 14 7 ... .. .. 65 40 43 57 21 29 -48 0 0 18 10 54 2 42 -16 57 4 38 57 38 23 ... .. .. 67 1 16 58 46 15 -47 0 0 18 10 53 3 40 -17 58 29 31 59 3 1 ... .. .. 68 23 4 60 11 31 -46 0 0 18 10 52 4 39 -18 59 54 53 60 28 11 ... .. .. 69 46 17 61 37 27 -45 0 0 18 10 50 6 38 -20 61 20 54 61 54 3 ... .. .. 71 11 7 63 4 12 -44 0 0 18 10 47 7 37 -21 62 47 42 63 20 45 ... .. .. 72 37 43 64 31 56 -43 0 0 18 10 44 9 36 -22 64 15 27 64 48 28 ... .. .. 74 6 19 66 0 49 -42 0 0 18 10 41 10 35 -23 65 44 20 66 17 21 ... .. .. 75 37 7 67 31 2 -41 0 0 18 10 36 12 34 -25 67 14 31 67 47 36 ... .. .. 77 10 25 69 2 46 -40 0 0 18 10 31 13 33 -26 68 46 11 69 19 24 ... .. .. 78 46 28 70 36 14 -39 0 0 18 10 26 15 32 -27 70 19 34 70 52 57 ... .. .. 80 25 39 72 11 39 -38 0 0 18 10 19 16 31 -29 71 54 52 72 28 30 ... .. .. 82 8 20 73 49 17 -37 0 0 18 10 12 18 30 -30 73 32 20 74 6 19 ... .. .. 83 55 0 75 29 26 -36 0 0 18 10 4 19 29 -31 75 12 16 75 46 40 66 36 45 85 46 13 77 12 24 -35 0 0 18 9 55 21 27 -32 76 54 59 77 29 53 68 14 10 87 42 42 78 58 34 -34 0 0 18 9 45 22 26 -33 78 40 51 79 16 22 69 53 26 89 45 20 80 48 22 -33 0 0 18 9 34 24 25 -35 80 30 18 81 6 33 71 34 50 91 55 15 82 42 21 -32 0 0 18 9 23 25 23 -36 82 23 50 83 0 59 73 18 39 94 13 59 84 41 8 -31 0 0 18 9 10 27 22 -37 84 22 5 85 0 19 75 5 12 96 43 39 86 45 31 -30 0 0 18 8 55 28 20 -38 86 25 49 87 5 22 76 54 52 99 27 21 Latitude Latitude Latitude Latitude 87 0 0 -29 53 12 18 8 53 28 20 -38 -29 43 56 -30 2 31 -25 3 47 -35 21 40 88 0 0 -29 25 28 18 8 46 29 19 -38 -29 16 16 -29 34 43 -24 37 49 -34 51 20 89 0 0 -28 58 26 18 8 39 30 18 -39 -28 49 17 -29 7 37 -24 12 29 -34 21 48 90 0 0 -28 32 5 18 8 31 31 17 -39 -28 23 0 -28 41 13 -23 47 48 -33 53 3 91 0 0 -28 6 26 18 8 24 31 16 -39 -27 57 24 -28 15 30 -23 23 46 -33 25 4 92 0 0 -27 41 29 18 8 16 32 16 -40 -27 32 30 -27 50 30 -23 0 23 -32 57 53 93 0 0 -27 17 15 18 8 8 32 15 -40 -27 8 19 -27 26 12 -22 37 39 -32 31 28 94 0 0 -26 53 42 18 8 0 33 14 -40 -26 44 50 -27 2 37 -22 15 34 -32 5 51 95 0 0 -26 30 53 18 7 52 34 13 -40 -26 22 3 -26 39 44 -21 54 9 -31 41 2 96 0 0 -26 8 46 18 7 44 34 12 -41 -25 59 59 -26 17 34 -21 33 23 -31 17 0 97 0 0 -25 47 22 18 7 36 35 11 -41 -25 38 38 -25 56 7 -21 13 18 -30 53 45 98 0 0 -25 26 40 18 7 28 35 10 -41 -25 17 59 -25 35 23 -20 53 52 -30 31 17 99 0 0 -25 6 42 18 7 19 36 9 -41 -24 58 3 -25 15 22 -20 35 6 -30 9 37 100 0 0 -24 47 26 18 7 11 36 8 -41 -24 38 50 -24 56 4 -20 17 1 -29 48 44 101 0 0 -24 28 54 18 7 2 37 7 -41 -24 20 20 -24 37 29 -19 59 35 -29 28 39 102 0 0 -24 11 5 18 6 54 37 6 -41 -24 2 33 -24 19 38 -19 42 50 -29 9 20 103 0 0 -23 53 58 18 6 45 37 5 -41 -23 45 29 -24 2 29 -19 26 45 -28 50 49 104 0 0 -23 37 35 18 6 36 38 4 -41 -23 29 8 -23 46 4 -19 11 20 -28 33 6 105 0 0 -23 21 55 18 6 28 38 3 -41 -23 13 30 -23 30 22 -18 56 36 -28 16 9 106 0 0 -23 6 59 18 6 19 38 2 -41 -22 58 35 -23 15 24 -18 42 32 -28 0 0 107 0 0 -22 52 45 18 6 10 38 1 -40 -22 44 23 -23 1 8 -18 29 9 -27 44 38 108 0 0 -22 39 15 18 6 1 39 360 -40 -22 30 54 -22 47 36 -18 16 26 -27 30 3 109 0 0 -22 26 27 18 5 52 39 359 -40 -22 18 9 -22 34 48 -18 4 23 -27 16 15 110 0 0 -22 14 23 18 5 43 39 357 -40 -22 6 6 -22 22 42 -17 53 1 -27 3 13 111 0 0 -22 3 2 18 5 34 39 356 -40 -21 54 46 -22 11 20 -17 42 20 -26 50 59 112 0 0 -21 52 25 18 5 25 39 355 -39 -21 44 10 -22 0 41 -17 32 19 -26 39 32 113 0 0 -21 42 30 18 5 16 39 354 -39 -21 34 17 -21 50 45 -17 22 59 -26 28 51 114 0 0 -21 33 19 18 5 7 39 353 -39 -21 25 7 -21 41 33 -17 14 19 -26 18 57 115 0 0 -21 24 51 18 4 59 39 352 -38 -21 16 39 -21 33 4 -17 6 19 -26 9 51 116 0 0 -21 17 6 18 4 50 39 351 -38 -21 8 55 -21 25 18 -16 59 1 -26 1 30 117 0 0 -21 10 4 18 4 41 39 350 -37 -21 1 54 -21 18 15 -16 52 22 -25 53 57 118 0 0 -21 3 46 18 4 32 39 349 -37 -20 55 37 -21 11 56 -16 46 25 -25 47 10 119 0 0 -20 58 10 18 4 23 39 348 -36 -20 50 2 -21 6 20 -16 41 8 -25 41 10 120 0 0 -20 53 18 18 4 14 39 347 -36 -20 45 10 -21 1 27 -16 36 31 -25 35 56 121 0 0 -20 49 9 18 4 5 39 345 -35 -20 41 2 -20 57 18 -16 32 36 -25 31 29 122 0 0 -20 45 43 18 3 56 39 344 -35 -20 37 36 -20 53 52 -16 29 21 -25 27 49 123 0 0 -20 43 1 18 3 48 39 343 -34 -20 34 54 -20 51 9 -16 26 46 -25 24 56 124 0 0 -20 41 1 18 3 39 38 342 -34 -20 32 55 -20 49 9 -16 24 52 -25 22 49 125 0 0 -20 39 45 18 3 30 38 341 -33 -20 31 39 -20 47 53 -16 23 39 -25 21 29 126 0 0 -20 39 12 18 3 22 38 340 -33 -20 31 6 -20 47 20 -16 23 7 -25 20 55 127 0 0 -20 39 23 18 3 13 37 339 -32 -20 31 16 -20 47 31 -16 23 16 -25 21 9 128 0 0 -20 40 17 18 3 5 37 338 -31 -20 32 10 -20 48 25 -16 24 5 -25 22 9 129 0 0 -20 41 54 18 2 56 37 337 -31 -20 33 47 -20 50 2 -16 25 35 -25 23 56 130 0 0 -20 44 15 18 2 48 36 336 -30 -20 36 8 -20 52 23 -16 27 46 -25 26 29 131 0 0 -20 47 19 18 2 39 36 335 -29 -20 39 11 -20 55 28 -16 30 38 -25 29 50 132 0 0 -20 51 7 18 2 31 36 335 -28 -20 42 59 -20 59 16 -16 34 11 -25 33 58 133 0 0 -20 55 38 18 2 23 35 334 -28 -20 47 29 -21 3 48 -16 38 24 -25 38 53 134 0 0 -21 0 53 18 2 15 35 333 -27 -20 52 43 -21 9 4 -16 43 19 -25 44 35 135 0 0 -21 6 52 18 2 7 34 332 -26 -20 58 41 -21 15 3 -16 48 55 -25 51 4 136 0 0 -21 13 34 18 1 59 34 331 -25 -21 5 23 -21 21 46 -16 55 12 -25 58 21 137 0 0 -21 21 0 18 1 51 33 330 -25 -21 12 48 -21 29 14 -17 2 10 -26 6 25 138 0 0 -21 29 10 18 1 44 32 329 -24 -21 20 57 -21 37 25 -17 9 49 -26 15 16 139 0 0 -21 38 4 18 1 36 32 329 -23 -21 29 50 -21 46 20 -17 18 10 -26 24 55 140 0 0 -21 47 42 18 1 29 31 328 -22 -21 39 27 -21 55 59 -17 27 12 -26 35 22 141 0 0 -21 58 4 18 1 22 31 327 -21 -21 49 47 -22 6 22 -17 36 55 -26 46 37 142 0 0 -22 9 10 18 1 14 30 326 -21 -22 0 52 -22 17 30 -17 47 20 -26 58 39 143 0 0 -22 21 1 18 1 7 29 326 -20 -22 12 41 -22 29 22 -17 58 26 -27 11 30 144 0 0 -22 33 35 18 1 0 29 325 -19 -22 25 14 -22 41 58 -18 10 13 -27 25 9 145 0 0 -22 46 54 18 0 54 28 324 -18 -22 38 31 -22 55 19 -18 22 42 -27 39 36 146 0 0 -23 0 58 18 0 47 27 324 -17 -22 52 33 -23 9 24 -18 35 53 -27 54 51 147 0 0 -23 15 45 18 0 40 26 323 -16 -23 7 18 -23 24 14 -18 49 45 -28 10 55 148 0 0 -23 31 18 18 0 34 26 322 -15 -23 22 49 -23 39 48 -19 4 19 -28 27 48 149 0 0 -23 47 35 18 0 28 25 322 -15 -23 39 4 -23 56 7 -19 19 34 -28 45 29 150 0 0 -24 4 36 18 0 22 24 321 -14 -23 56 3 -24 13 11 -19 35 31 -29 4 0 151 0 0 -24 22 22 18 0 16 23 320 -13 -24 13 46 -24 31 0 -19 52 10 -29 23 19 152 0 0 -24 40 53 18 0 10 23 320 -12 -24 32 15 -24 49 33 -20 9 31 -29 43 27 153 0 0 -25 0 8 18 0 5 22 319 -11 -24 51 28 -25 8 51 -20 27 33 -30 4 25 154 0 0 -25 20 9 17 59 59 21 319 -10 -25 11 25 -25 28 54 -20 46 16 -30 26 12 155 0 0 -25 40 53 17 59 54 20 318 -9 -25 32 7 -25 49 41 -21 5 42 -30 48 48 156 0 0 -26 2 23 17 59 49 19 317 -8 -25 53 34 -26 11 14 -21 25 49 -31 12 13 157 0 0 -26 24 37 17 59 45 18 317 -7 -26 15 45 -26 33 31 -21 46 37 -31 36 28 158 0 0 -26 47 36 17 59 40 17 316 -6 -26 38 40 -26 56 33 -22 8 7 -32 1 33 159 0 0 -27 11 19 17 59 36 17 316 -5 -27 2 20 -27 20 19 -22 30 18 -32 27 27 160 0 0 -27 35 46 17 59 32 16 315 -4 -27 26 44 -27 44 50 -22 53 11 -32 54 10 161 0 0 -28 0 58 17 59 28 15 315 -3 -27 51 53 -28 10 5 -23 16 44 -33 21 43 162 0 0 -28 26 54 17 59 24 14 314 -2 -28 17 45 -28 36 5 -23 40 59 -33 50 6 163 0 0 -28 53 34 17 59 20 13 314 -1 -28 44 21 -29 2 49 -24 5 54 -34 19 18 164 0 0 -29 20 58 17 59 17 12 313 0 -29 11 41 -29 30 16 .. .. .. -34 49 19 Uncertainty in time = +/- 28 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 1889-00340-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 11 40.5963 DE: +28 46 05.820 * position source: Pos: mpos:UCAC2 pm:UCAC2, pm: , pi: * standard error: RA,DE ["]: ( .200, .200 ) * V mag [mag]: 8.9 * B mag [mag]: 9.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2601) Bologna approx. diameter [km]: 19 approx. diameter ["]: .013 distance from Earth [AU]: 2.02900 * orbital information: orbit source: Preston date of fit: 2008 Nov 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 769 number of rejected observations: 20 time covered by the observations: 1965 Jan 11 - 2008 Nov 04 1 sigma uncertainty ellipse (major, minor, PA): 0.085, 0.055, 101° remarks: * orbital elements for (2601) Bologna : Mean anomaly = 324.62801631 deg Arg. of pericenter = 197.39633480 deg Long. of node = 288.30152965 deg Inclination = 9.59803864 deg Eccentricity = 0.06319076 Semimajor axis = 3.12859962 AU Perihelion dist = 2.93090105 AU Mag: H = 11.23, G = 0.15 Epoch of elements : MJD 54804.75300000 TDT (2008 Dec 04.753) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 4 2601 Bologna 18h 4.9m UT 8.9 6 11 40.596 28 46 5.82TYC 1889-00340-1 9.1 15.6 19 1.7 2.029 -2.076 -4.25 107.7607 28.769 -93.61 -22.36 18.0823 0.11897 -0.76223 -6.29288 -0.98049 -0.00200 -0.00049 2000 323.78147720081130.00000197.396335288.301530 9.5980390.06319076 3.1285996 2.930901011.2 5.00.15 RATE 1.7810620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.217 0.207 92 16.97 0.206 0 54796.5020081204_0340-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org