IOTA/IOTA-ES occultation update for (1054) Forsytia / TYC 6933-00126-1 event on 2009 Nov 05, 11:15 UT Visible from Summary ------- On 2009 Nov 05 UT, the 50 km diameter asteroid (1054) Forsytia will occult a 9.5 mag star in the constellation Microscopium for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.0 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.4 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: 62 * date and approx. time of event: 2009 Nov 05, 11:15 - 2009 Nov 05, 11:18 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 6.0 * estimated maximum duration [s]: 2.4 * Moon: 91 % sunlit, 130° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 1.00 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .026", 86° ) * approx speed of asteroid's shadow [km/s]: 20.8116 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6933-00126-1 by 1054 Forsytia on 2009 Nov 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 94 0 0 14 3 4 11 15 50 48 175 -1 13 43 8 14 23 7 13 3 34 15 3 33 95 0 0 14 33 29 11 15 55 47 176 -2 14 13 25 14 53 39 13 33 37 15 34 21 96 0 0 15 4 44 11 16 1 47 177 -3 14 44 33 15 25 3 14 4 30 16 6 0 97 0 0 15 36 50 11 16 7 46 179 -4 15 16 31 15 57 17 14 36 13 16 38 31 98 0 0 16 9 46 11 16 13 46 180 -5 15 49 19 16 30 21 15 8 45 17 11 52 99 0 0 16 43 32 11 16 18 45 181 -6 16 22 56 17 4 15 15 42 7 17 46 3 100 0 0 17 18 7 11 16 24 44 183 -8 16 57 23 17 38 58 16 16 17 18 21 3 101 0 0 17 53 30 11 16 29 44 184 -9 17 32 37 18 14 30 16 51 15 18 56 53 102 0 0 18 29 41 11 16 35 43 185 -10 18 8 40 18 50 50 17 27 0 19 33 32 103 0 0 19 6 40 11 16 40 42 186 -11 18 45 30 19 27 58 18 3 33 20 10 59 104 0 0 19 44 26 11 16 46 42 187 -12 19 23 6 20 5 53 18 40 51 20 49 13 105 0 0 20 22 57 11 16 51 41 188 -13 20 1 28 20 44 34 19 18 55 21 28 13 106 0 0 21 2 13 11 16 56 40 189 -14 20 40 35 21 24 0 19 57 44 22 7 59 107 0 0 21 42 14 11 17 2 39 191 -15 21 20 26 22 4 10 20 37 16 22 48 30 108 0 0 22 22 58 11 17 7 39 192 -16 22 1 0 22 45 4 21 17 31 23 29 44 109 0 0 23 4 24 11 17 12 38 193 -17 22 42 16 23 26 40 21 58 28 24 11 40 110 0 0 23 46 30 11 17 17 37 194 -18 23 24 13 24 8 57 22 40 5 24 54 18 111 0 0 24 29 16 11 17 22 36 195 -19 24 6 49 24 51 53 23 22 22 25 37 36 112 0 0 25 12 41 11 17 26 35 195 -20 24 50 3 25 35 28 24 5 16 26 21 32 113 0 0 25 56 42 11 17 31 34 196 -21 25 33 54 26 19 40 24 48 47 27 6 6 114 0 0 26 41 19 11 17 36 33 197 -22 26 18 21 27 4 27 25 32 54 27 51 15 115 0 0 27 26 29 11 17 40 32 198 -23 27 3 20 27 49 48 26 17 33 28 36 58 116 0 0 28 12 11 11 17 44 31 199 -24 27 48 52 28 35 41 27 2 45 29 23 13 117 0 0 28 58 23 11 17 49 30 200 -25 28 34 54 29 22 4 27 48 26 30 9 58 118 0 0 29 45 4 11 17 53 29 201 -26 29 21 24 30 8 55 28 34 36 30 57 11 119 0 0 30 32 11 11 17 57 28 201 -27 30 8 20 30 56 12 29 21 12 31 44 51 120 0 0 31 19 41 11 18 0 27 202 -28 30 55 41 31 43 54 30 8 12 32 32 55 121 0 0 32 7 34 11 18 4 26 203 -29 31 43 23 32 31 57 30 55 35 33 21 20 122 0 0 32 55 47 11 18 8 25 204 -30 32 31 25 33 20 20 31 43 17 34 10 5 123 0 0 33 44 17 11 18 11 24 204 -31 33 19 45 34 9 1 32 31 18 34 59 7 124 0 0 34 33 2 11 18 14 23 205 -31 34 8 20 34 57 56 33 19 33 35 48 24 125 0 0 35 22 0 11 18 17 21 206 -32 34 57 8 35 47 4 34 8 2 36 37 53 126 0 0 36 11 7 11 18 20 20 207 -33 35 46 6 36 36 22 34 56 41 37 27 31 127 0 0 37 0 22 11 18 23 19 207 -34 36 35 12 37 25 46 35 45 29 38 17 16 128 0 0 37 49 42 11 18 25 18 208 -34 37 24 22 38 15 16 36 34 22 39 7 6 129 0 0 38 39 4 11 18 28 17 209 -35 38 13 36 39 4 47 37 23 17 39 56 56 130 0 0 39 28 26 11 18 30 16 210 -36 39 2 48 39 54 18 38 12 14 40 46 46 131 0 0 40 17 45 11 18 32 15 210 -36 39 51 59 40 43 45 39 1 8 41 36 31 132 0 0 41 6 57 11 18 34 14 211 -37 40 41 3 41 33 6 39 49 57 42 26 9 133 0 0 41 56 1 11 18 36 13 212 -38 41 29 59 42 22 17 40 38 38 43 15 37 134 0 0 42 44 53 11 18 37 12 212 -38 42 18 44 43 11 17 41 27 10 44 4 53 135 0 0 43 33 32 11 18 39 10 213 -39 43 7 16 44 0 3 42 15 29 44 53 53 136 0 0 44 21 54 11 18 40 9 214 -39 43 55 32 44 48 31 43 3 32 45 42 35 137 0 0 45 9 56 11 18 41 8 215 -39 44 43 28 45 36 39 43 51 17 46 30 56 138 0 0 45 57 37 11 18 42 7 215 -40 45 31 3 46 24 26 44 38 42 47 18 54 139 0 0 46 44 53 11 18 43 6 216 -40 46 18 15 47 11 47 45 25 45 48 6 25 140 0 0 47 31 42 11 18 44 5 217 -41 47 5 0 47 58 41 46 12 22 48 53 28 141 0 0 48 18 3 11 18 44 4 218 -41 47 51 17 48 45 5 46 58 31 49 40 1 142 0 0 49 3 52 11 18 45 3 218 -41 48 37 3 49 30 57 47 44 11 50 26 0 143 0 0 49 49 7 11 18 45 2 219 -41 49 22 16 50 16 15 .. .. .. 51 11 23 144 0 0 50 33 47 11 18 45 1 220 -42 50 6 54 51 0 57 .. .. .. 51 56 10 145 0 0 51 17 50 11 18 45 0 221 -42 50 50 55 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6933-00126-1 * constellation : Microscopium * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 46 44.9925 DE: -28 17 22.228 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .021 ) * V mag [mag]: 9.5 * B mag [mag]: 9.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1054) Forsytia approx. diameter [km]: 50 approx. diameter ["]: .027 distance from Earth [AU]: 2.55300 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 844 number of rejected observations: 49 time covered by the observations: 1925 Nov 20 - 2008 Apr 14 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.016, 84° remarks: * orbital elements for (1054) Forsytia : Mean anomaly = 321.03936170 deg Arg. of pericenter = 293.62026048 deg Long. of node = 86.02605680 deg Inclination = 10.85083933 deg Eccentricity = 0.13891396 Semimajor axis = 2.92289154 AU Perihelion dist = 2.51686111 AU Mag: H = 10.45, G = 0.15 Epoch of elements : MJD 55140.46900000 TDT (2009 Nov 05.469) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 5 1054 Forsytia 11h 14.9m UT 9.5 20 46 44.993-28 17 22.23TYC 6933-00126-1 9.9 15.5 50 2.4 2.553 2.843 15.06 98.1482 -28.293 7.19 -15.79 11.2479 -0.24221 0.60105 10.90267 4.37215 0.00556 0.00143 2000 320.946859200911 5.00000293.620260 86.026057 10.8508390.13891396 2.9228915 2.516861110.3 5.00.15 RATE 1.9723540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.026 86 2.00 0.027 0 54581.5020091105_0126-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 09:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org