IOTA/IOTA-ES occultation update for (1829) Dawson / TYC 1929-01002-1 event on 2009 Nov 02, 05:23 UT Visible from Summary ------- On 2009 Nov 02 UT, the 11 km diameter asteroid (1829) Dawson will occult a 8.8 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 7.3 mag to 16.1 mag (the magnitude of the asteroid) for at most 1.0 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: 25 * date and approx. time of event: 2009 Nov 02, 05:14 - 2009 Nov 02, 05:25 UT * magnitude of target star: 8.8 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 1.0 * Moon: 99 % sunlit, 83° distance * Sun: 105° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 2.64 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .026", 108° ) * approx speed of asteroid's shadow [km/s]: 11.0192 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1929-01002-1 by 1829 Dawson on 2009 Nov 2 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 -110 0 0 33 26 55 5 14 38 0 60 -59 33 23 11 33 30 40 .. .. .. 33 50 25 -109 0 0 33 56 11 5 14 38 1 60 -60 33 52 27 33 59 55 33 32 47 34 19 38 -108 0 0 34 25 5 5 14 39 2 61 -60 34 21 22 34 28 48 34 1 44 34 48 30 -107 0 0 34 53 38 5 14 39 3 62 -60 34 49 55 34 57 21 34 30 20 35 17 0 -106 0 0 35 21 48 5 14 40 4 62 -61 35 18 6 35 25 31 34 58 33 35 45 8 -105 0 0 35 49 36 5 14 41 5 63 -61 35 45 54 35 53 18 35 26 24 36 12 53 -104 0 0 36 17 1 5 14 42 6 63 -61 36 13 19 36 20 43 35 53 51 36 40 15 -103 0 0 36 44 2 5 14 43 7 64 -62 36 40 21 36 47 43 36 20 56 37 7 13 -102 0 0 37 10 40 5 14 44 8 65 -62 37 6 59 37 14 20 36 47 36 37 33 47 -101 0 0 37 36 53 5 14 46 9 65 -62 37 33 13 37 40 33 37 13 53 37 59 57 -100 0 0 38 2 41 5 14 48 10 66 -62 37 59 2 38 6 21 37 39 44 38 25 42 - 99 0 0 38 28 4 5 14 49 11 66 -62 38 24 26 38 31 43 38 5 11 38 51 2 - 98 0 0 38 53 3 5 14 51 12 67 -62 38 49 24 38 56 41 38 30 13 39 15 56 - 97 0 0 39 17 35 5 14 53 12 68 -63 39 13 58 39 21 13 38 54 49 39 40 25 - 96 0 0 39 41 42 5 14 55 13 68 -63 39 38 5 39 45 20 39 19 0 40 4 29 - 95 0 0 40 5 24 5 14 58 14 69 -63 40 1 47 40 9 0 39 42 45 40 28 6 - 94 0 0 40 28 39 5 15 0 15 70 -63 40 25 3 40 32 15 40 6 4 40 51 17 - 93 0 0 40 51 27 5 15 2 16 70 -62 40 47 52 40 55 3 40 28 57 41 14 2 - 92 0 0 41 13 50 5 15 5 17 71 -62 41 10 15 41 17 25 40 51 23 41 36 21 - 91 0 0 41 35 46 5 15 8 18 72 -62 41 32 12 41 39 20 41 13 23 41 58 13 - 90 0 0 41 57 16 5 15 11 18 72 -62 41 53 42 42 0 49 41 34 56 42 19 38 - 89 0 0 42 18 19 5 15 14 19 73 -62 42 14 46 42 21 51 41 56 3 42 40 37 - 88 0 0 42 38 55 5 15 17 20 74 -62 42 35 23 42 42 27 42 16 44 43 1 10 - 87 0 0 42 59 5 5 15 20 21 75 -62 42 55 33 43 2 36 42 36 58 43 21 16 - 86 0 0 43 18 48 5 15 23 22 75 -61 43 15 17 43 22 19 42 56 45 43 40 55 - 85 0 0 43 38 5 5 15 26 22 76 -61 43 34 34 43 41 35 43 16 5 44 0 7 - 84 0 0 43 56 55 5 15 30 23 77 -61 43 53 25 44 0 24 43 35 0 44 18 53 - 83 0 0 44 15 18 5 15 33 24 78 -61 44 11 49 44 18 47 43 53 27 44 37 13 - 82 0 0 44 33 15 5 15 37 25 78 -60 44 29 47 44 36 44 44 11 28 44 55 6 - 81 0 0 44 50 46 5 15 40 26 79 -60 44 47 19 44 54 14 44 29 3 45 12 33 - 80 0 0 45 7 51 5 15 44 26 80 -60 45 4 24 45 11 18 44 46 11 45 29 34 - 79 0 0 45 24 29 5 15 48 27 81 -59 45 21 3 45 27 56 45 2 54 45 46 8 - 78 0 0 45 40 41 5 15 51 28 82 -59 45 37 16 45 44 7 45 19 10 46 2 17 - 77 0 0 45 56 28 5 15 55 29 82 -58 45 53 2 45 59 53 45 35 0 46 17 59 - 76 0 0 46 11 48 5 15 59 29 83 -58 46 8 24 46 15 13 45 50 24 46 33 16 - 75 0 0 46 26 43 5 16 3 30 84 -58 46 23 19 46 30 7 46 5 23 46 48 7 - 74 0 0 46 41 12 5 16 7 31 85 -57 46 37 49 46 44 36 46 19 55 47 2 32 - 73 0 0 46 55 16 5 16 11 31 86 -57 46 51 53 46 58 39 46 34 3 47 16 32 - 72 0 0 47 8 54 5 16 16 32 87 -56 47 5 32 47 12 17 46 47 45 47 30 7 - 71 0 0 47 22 8 5 16 20 33 87 -56 47 18 46 47 25 30 47 1 2 47 43 17 - 70 0 0 47 34 56 5 16 24 34 88 -55 47 31 35 47 38 17 47 13 53 47 56 2 - 69 0 0 47 47 19 5 16 29 34 89 -55 47 43 59 47 50 40 47 26 20 48 8 22 - 68 0 0 47 59 18 5 16 33 35 90 -55 47 55 58 48 2 38 47 38 22 48 20 17 - 67 0 0 48 10 52 5 16 37 36 91 -54 48 7 33 48 14 12 47 49 59 48 31 48 - 66 0 0 48 22 2 5 16 42 36 92 -54 48 18 43 48 25 21 48 1 12 48 42 55 - 65 0 0 48 32 48 5 16 46 37 93 -53 48 29 29 48 36 6 48 12 1 48 53 38 - 64 0 0 48 43 9 5 16 51 38 94 -53 48 39 51 48 46 27 48 22 25 49 3 56 - 63 0 0 48 53 6 5 16 56 38 95 -52 48 49 49 48 56 24 48 32 25 49 13 50 - 62 0 0 49 2 40 5 17 0 39 96 -52 48 59 23 49 5 57 48 42 2 49 23 21 - 61 0 0 49 11 50 5 17 5 40 97 -51 49 8 33 49 15 7 48 51 14 49 32 29 - 60 0 0 49 20 36 5 17 10 40 98 -51 49 17 20 49 23 53 49 0 3 49 41 12 - 59 0 0 49 28 59 5 17 15 41 98 -50 49 25 43 49 32 15 49 8 29 49 49 33 - 58 0 0 49 36 59 5 17 20 41 99 -49 49 33 43 49 40 15 49 16 31 49 57 30 - 57 0 0 49 44 35 5 17 24 42 100 -49 49 41 20 49 47 51 49 24 10 50 5 4 - 56 0 0 49 51 49 5 17 29 43 101 -48 49 48 34 49 55 4 49 31 25 50 12 16 - 55 0 0 49 58 40 5 17 34 43 102 -48 49 55 25 50 1 54 49 38 18 50 19 4 - 54 0 0 50 5 8 5 17 39 44 103 -47 50 1 53 50 8 22 49 44 48 50 25 30 - 53 0 0 50 11 13 5 17 44 45 105 -47 50 7 59 50 14 27 49 50 55 50 31 33 - 52 0 0 50 16 55 5 17 49 45 106 -46 50 13 41 50 20 9 49 56 39 50 37 14 - 51 0 0 50 22 15 5 17 55 46 107 -46 50 19 2 50 25 29 50 2 1 50 42 33 - 50 0 0 50 27 13 5 18 0 46 108 -45 50 24 0 50 30 27 50 7 0 50 47 29 - 49 0 0 50 31 49 5 18 5 47 109 -45 50 28 35 50 35 2 50 11 37 50 52 3 - 48 0 0 50 36 2 5 18 10 48 110 -44 50 32 49 50 39 15 50 15 52 50 56 15 - 47 0 0 50 39 53 5 18 15 48 111 -44 50 36 40 50 43 6 50 19 44 51 0 4 - 46 0 0 50 43 22 5 18 21 49 112 -43 50 40 9 50 46 34 50 23 14 51 3 32 - 45 0 0 50 46 29 5 18 26 49 113 -42 50 43 16 50 49 41 50 26 22 51 6 38 - 44 0 0 50 49 14 5 18 31 50 114 -42 50 46 1 50 52 26 50 29 8 51 9 22 - 43 0 0 50 51 37 5 18 37 50 116 -41 50 48 25 50 54 49 50 31 32 51 11 44 - 42 0 0 50 53 38 5 18 42 51 117 -41 50 50 26 50 56 50 50 33 33 51 13 45 - 41 0 0 50 55 17 5 18 48 52 118 -40 50 52 5 50 58 29 50 35 13 51 15 23 - 40 0 0 50 56 34 5 18 53 52 119 -40 50 53 23 50 59 46 50 36 31 51 16 40 - 39 0 0 50 57 30 5 18 59 53 120 -39 50 54 18 51 0 42 50 37 27 51 17 36 - 38 0 0 50 58 4 5 19 5 53 122 -38 50 54 52 51 1 15 50 38 1 51 18 9 - 37 0 0 50 58 16 5 19 10 54 123 -38 50 55 4 51 1 27 50 38 13 51 18 21 - 36 0 0 50 58 6 5 19 16 54 124 -37 50 54 54 51 1 18 50 38 3 51 18 11 - 35 0 0 50 57 34 5 19 22 55 125 -37 50 54 22 51 0 46 50 37 31 51 17 39 - 34 0 0 50 56 41 5 19 27 55 127 -36 50 53 29 50 59 52 50 36 38 51 16 46 - 33 0 0 50 55 25 5 19 33 56 128 -36 50 52 13 50 58 37 50 35 22 51 15 31 - 32 0 0 50 53 48 5 19 39 56 129 -35 50 50 36 50 57 0 50 33 44 51 13 54 - 31 0 0 50 51 48 5 19 45 57 131 -34 50 48 36 50 55 0 50 31 44 51 11 55 - 30 0 0 50 49 27 5 19 51 57 132 -34 50 46 15 50 52 39 50 29 22 51 9 35 - 29 0 0 50 46 43 5 19 57 58 134 -33 50 43 31 50 49 56 50 26 38 51 6 52 - 28 0 0 50 43 38 5 20 3 58 135 -33 50 40 26 50 46 50 50 23 31 51 3 47 - 27 0 0 50 40 10 5 20 9 59 137 -32 50 36 58 50 43 23 50 20 2 51 0 20 - 26 0 0 50 36 20 5 20 15 59 138 -31 50 33 7 50 39 33 50 16 11 50 56 31 - 25 0 0 50 32 7 5 20 21 60 140 -31 50 28 54 50 35 20 50 11 57 50 52 20 - 24 0 0 50 27 32 5 20 27 60 141 -30 50 24 19 50 30 45 50 7 21 50 47 46 - 23 0 0 50 22 35 5 20 34 61 143 -30 50 19 21 50 25 48 50 2 22 50 42 50 - 22 0 0 50 17 14 5 20 40 61 145 -29 50 14 1 50 20 28 49 57 0 50 37 32 - 21 0 0 50 11 31 5 20 46 62 146 -28 50 8 17 50 14 45 49 51 15 50 31 50 - 20 0 0 50 5 25 5 20 53 62 148 -28 50 2 11 50 8 39 49 45 7 50 25 46 - 19 0 0 49 58 56 5 20 59 63 150 -27 49 55 42 50 2 11 49 38 36 50 19 19 - 18 0 0 49 52 4 5 21 6 63 152 -26 49 48 49 49 55 18 49 31 42 50 12 28 - 17 0 0 49 44 48 5 21 12 63 154 -26 49 41 33 49 48 3 49 24 24 50 5 15 - 16 0 0 49 37 9 5 21 19 64 155 -25 49 33 53 49 40 24 49 16 42 49 57 38 - 15 0 0 49 29 6 5 21 26 64 157 -24 49 25 50 49 32 22 49 8 37 49 49 37 - 14 0 0 49 20 39 5 21 32 65 159 -24 49 17 23 49 23 55 49 0 8 49 41 13 - 13 0 0 49 11 48 5 21 39 65 161 -23 49 8 32 49 15 5 48 51 15 49 32 25 - 12 0 0 49 2 34 5 21 46 65 163 -22 48 59 17 49 5 51 48 41 57 49 23 13 - 11 0 0 48 52 54 5 21 53 66 166 -22 48 49 37 48 56 12 48 32 15 49 13 36 - 10 0 0 48 42 51 5 22 0 66 168 -21 48 39 33 48 46 9 48 22 9 49 3 36 - 9 0 0 48 32 22 5 22 7 66 170 -20 48 29 4 48 35 41 48 11 38 48 53 10 - 8 0 0 48 21 29 5 22 14 67 172 -20 48 18 10 48 24 48 48 0 41 48 42 20 - 7 0 0 48 10 11 5 22 21 67 175 -19 48 6 51 48 13 30 47 49 20 48 31 5 - 6 0 0 47 58 27 5 22 28 67 177 -18 47 55 7 48 1 47 47 37 33 48 19 25 - 5 0 0 47 46 18 5 22 35 67 179 -18 47 42 58 47 49 39 47 25 21 48 7 19 - 4 0 0 47 33 44 5 22 43 67 182 -17 47 30 23 47 37 5 47 12 43 47 54 48 - 3 0 0 47 20 43 5 22 50 68 184 -16 47 17 22 47 24 5 46 59 39 47 41 51 - 2 0 0 47 7 17 5 22 57 68 187 -16 47 3 54 47 10 39 46 46 9 47 28 28 - 1 0 0 46 53 24 5 23 5 68 189 -15 46 50 1 46 56 47 46 32 12 47 14 39 0 0 0 46 39 5 5 23 12 68 192 -14 46 35 41 46 42 28 46 17 49 47 0 23 1 0 0 46 24 19 5 23 20 68 195 -13 46 20 55 46 27 43 46 3 0 46 45 41 2 0 0 46 9 6 5 23 28 68 197 -13 46 5 42 46 12 31 45 47 43 46 30 32 3 0 0 45 53 26 5 23 35 68 200 -12 45 50 1 45 56 52 45 32 0 46 14 57 4 0 0 45 37 20 5 23 43 68 203 -11 45 33 54 45 40 45 45 15 49 45 58 54 5 0 0 45 20 45 5 23 51 68 205 -10 45 17 19 45 24 12 44 59 11 45 42 24 6 0 0 45 3 44 5 23 59 68 208 -10 45 0 17 45 7 11 44 42 5 45 25 26 7 0 0 44 46 14 5 24 7 68 211 -9 44 42 47 44 49 42 44 24 31 45 8 1 8 0 0 44 28 17 5 24 15 68 213 -8 44 24 49 44 31 46 44 6 30 44 50 8 9 0 0 44 9 52 5 24 23 68 216 -7 44 6 23 44 13 21 43 48 1 44 31 47 10 0 0 43 50 59 5 24 31 67 219 -6 43 47 29 43 54 29 43 29 3 44 12 58 11 0 0 43 31 37 5 24 39 67 221 -6 43 28 7 43 35 8 43 9 37 43 53 41 12 0 0 43 11 47 5 24 47 67 224 -5 43 8 16 43 15 19 42 49 43 43 33 55 13 0 0 42 51 29 5 24 56 67 226 -4 42 47 57 42 55 1 42 29 20 43 13 41 14 0 0 42 30 42 5 25 4 66 229 -3 42 27 10 42 34 15 42 8 29 42 52 59 15 0 0 42 9 27 5 25 13 66 231 -2 42 5 54 42 13 0 41 47 10 42 31 48 16 0 0 41 47 43 5 25 21 66 234 -1 41 44 9 41 51 17 41 25 21 42 10 8 17 0 0 41 25 31 5 25 29 65 236 -1 41 21 56 41 29 5 41 3 5 41 48 0 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1929-01002-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 49 30.8534 DE: +25 05 30.533 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .014, .017 ) * V mag [mag]: 8.8 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1829) Dawson approx. diameter [km]: 11 approx. diameter ["]: .010 distance from Earth [AU]: 1.48000 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 729 number of rejected observations: 10 time covered by the observations: 1929 Feb 04 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.020, 110° remarks: * orbital elements for (1829) Dawson : Mean anomaly = 7.57597285 deg Arg. of pericenter = 142.41591874 deg Long. of node = 293.50935470 deg Inclination = 6.33221713 deg Eccentricity = 0.11989618 Semimajor axis = 2.25109991 AU Perihelion dist = 1.98120164 AU Mag: H = 12.22, G = 0.15 Epoch of elements : MJD 55137.22500000 TDT (2009 Nov 02.225) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 2 1829 Dawson 5h 23.6m UT 8.8 7 49 30.853 25 5 30.53TYC 1929-01002-1 10.0 16.1 11 1.0 1.480 2.622 -9.83 -5.1474 25.095 95.00 -14.79 5.3935 0.09897 0.35405 5.99553 -1.65418 -0.00507 0.00084 2000 5.46758920091026.00000142.415919293.509355 6.3322170.11989618 2.2510999 1.981201612.5 5.00.15 RATE 2.9181790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.026 108 3.64 0.027 0 54581.5020091102_1002-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 09:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org