IOTA/IOTA-ES occultation update for (337) Devosa / UCAC2 19780680 event on 2009 Oct 01, 10:50 UT Visible from Summary ------- On 2009 Oct 01 UT, the 59 km diameter asteroid (337) Devosa will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.7 mag (the magnitude of the asteroid) for at most 4.4 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: 45 * date and approx. time of event: 2009 Oct 01, 10:49 - 2009 Oct 01, 10:58 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 4.4 * Moon: 92 % sunlit, 53° distance * Sun: 96° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .050", 89° ) * approx speed of asteroid's shadow [km/s]: 13.3454 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 19780680 by 337 Devosa on 2009 Oct 1 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 108 0 0 -36 51 42 10 49 22 81 36 0 -37 9 3 -36 34 21 -37 59 25 -35 44 5 109 0 0 -36 31 14 10 49 29 81 33 -1 -36 48 39 -36 13 49 -37 39 14 -35 23 20 110 0 0 -36 10 6 10 49 37 82 28 -2 -36 27 36 -35 52 37 -37 18 24 -35 1 55 111 0 0 -35 48 20 10 49 44 83 23 -3 -36 5 54 -35 30 45 -36 56 55 -34 39 51 112 0 0 -35 25 53 10 49 52 83 16 -4 -35 43 32 -35 8 14 -36 34 46 -34 17 6 113 0 0 -35 2 47 10 50 0 84 8 -5 -35 20 30 -34 45 3 -36 11 58 -33 53 41 114 0 0 -34 39 0 10 50 7 84 359 -6 -34 56 48 -34 21 11 -35 48 30 -33 29 36 115 0 0 -34 14 32 10 50 15 84 348 -6 -34 32 26 -33 56 39 -35 24 22 -33 4 49 116 0 0 -33 49 23 10 50 23 85 336 -7 -34 7 22 -33 31 25 -34 59 32 -32 39 21 117 0 0 -33 23 33 10 50 31 85 324 -8 -33 41 37 -33 5 30 -34 34 2 -32 13 12 118 0 0 -32 57 2 10 50 39 84 313 -9 -33 15 10 -32 38 54 -34 7 50 -31 46 20 119 0 0 -32 29 48 10 50 47 84 303 -10 -32 48 2 -32 11 35 -33 40 56 -31 18 47 120 0 0 -32 1 52 10 50 56 84 294 -11 -32 20 11 -31 43 34 -33 13 21 -30 50 31 121 0 0 -31 33 14 10 51 4 83 286 -12 -31 51 39 -31 14 51 -32 45 3 -30 21 33 122 0 0 -31 3 54 10 51 12 82 280 -13 -31 22 23 -30 45 25 -32 16 3 -29 51 52 123 0 0 -30 33 51 10 51 21 81 275 -14 -30 52 25 -30 15 17 -31 46 21 -29 21 28 124 0 0 -30 3 5 10 51 29 81 271 -15 -30 21 45 -29 44 26 -31 15 56 -28 50 22 125 0 0 -29 31 36 10 51 38 80 268 -16 -29 50 22 -29 12 52 -30 44 48 -28 18 33 126 0 0 -28 59 25 10 51 47 79 265 -17 -29 18 15 -28 40 35 -30 12 57 -27 46 1 127 0 0 -28 26 31 10 51 55 78 262 -18 -28 45 27 -28 7 36 -29 40 24 -27 12 46 128 0 0 -27 52 54 10 52 4 77 260 -19 -28 11 55 -27 33 53 -29 7 7 -26 38 49 129 0 0 -27 18 35 10 52 13 76 258 -20 -27 37 41 -26 59 29 -28 33 9 -26 4 9 130 0 0 -26 43 33 10 52 22 75 256 -21 -27 2 44 -26 24 22 -27 58 27 -25 28 47 131 0 0 -26 7 49 10 52 31 74 254 -22 -26 27 6 -25 48 33 -27 23 4 -24 52 43 132 0 0 -25 31 24 10 52 40 73 253 -23 -25 50 46 -25 12 3 -26 46 58 -24 15 58 133 0 0 -24 54 17 10 52 49 72 251 -24 -25 13 44 -24 34 51 -26 10 11 -23 38 32 134 0 0 -24 16 30 10 52 58 71 250 -25 -24 36 1 -23 56 58 -25 32 43 -23 0 25 135 0 0 -23 38 2 10 53 7 70 249 -27 -23 57 39 -23 18 26 -24 54 35 -22 21 39 136 0 0 -22 58 55 10 53 16 68 248 -28 -23 18 36 -22 39 14 -24 15 46 -21 42 13 137 0 0 -22 19 8 10 53 25 67 247 -29 -22 38 54 -21 59 23 -23 36 18 -21 2 8 138 0 0 -21 38 44 10 53 34 66 246 -30 -21 58 34 -21 18 54 -22 56 11 -20 21 27 139 0 0 -20 57 42 10 53 43 65 245 -31 -21 17 37 -20 37 48 -22 15 27 -19 40 8 140 0 0 -20 16 4 10 53 52 64 244 -32 -20 36 3 -19 56 6 -21 34 5 -18 58 14 141 0 0 -19 33 51 10 54 1 63 243 -33 -19 53 54 -19 13 49 -20 52 8 -18 15 45 142 0 0 -18 51 4 10 54 10 61 243 -34 -19 11 11 -18 30 58 -20 9 36 -17 32 43 143 0 0 -18 7 44 10 54 19 60 242 -36 -18 27 55 -17 47 34 -19 26 31 -16 49 8 144 0 0 -17 23 53 10 54 27 59 241 -37 -17 44 7 -17 3 39 -18 42 53 -16 5 3 145 0 0 -16 39 31 10 54 36 58 241 -38 -16 59 49 -16 19 14 -17 58 45 -15 20 29 146 0 0 -15 54 41 10 54 45 57 240 -39 -16 15 2 -15 34 21 -17 14 7 -14 35 26 147 0 0 -15 9 23 10 54 54 55 240 -40 -15 29 47 -14 49 1 -16 29 1 -13 49 58 148 0 0 -14 23 41 10 55 2 54 239 -41 -14 44 7 -14 3 15 -15 43 28 -13 4 5 149 0 0 -13 37 34 10 55 11 53 239 -43 -13 58 3 -13 17 7 -14 57 32 -12 17 50 150 0 0 -12 51 6 10 55 19 52 239 -44 -13 11 37 -12 30 36 -14 11 12 -11 31 13 151 0 0 -12 4 18 10 55 27 50 238 -45 -12 24 51 -11 43 46 -13 24 31 -10 44 18 152 0 0 -11 17 12 10 55 36 49 238 -46 -11 37 46 -10 56 38 -12 37 31 - 9 57 5 153 0 0 -10 29 49 10 55 44 48 237 -47 -10 50 25 -10 9 14 -11 50 14 - 9 9 38 154 0 0 - 9 42 13 10 55 51 47 237 -49 -10 2 50 - 9 21 37 -11 2 42 - 8 21 57 155 0 0 - 8 54 24 10 55 59 45 237 -50 - 9 15 2 - 8 33 48 -10 14 57 - 7 34 5 156 0 0 - 8 6 26 10 56 7 44 237 -51 - 8 27 4 - 7 45 49 - 9 27 1 - 6 46 5 157 0 0 - 7 18 20 10 56 14 43 236 -52 - 7 38 59 - 6 57 42 - 8 38 56 - 5 57 58 158 0 0 - 6 30 8 10 56 22 41 236 -53 - 6 50 47 - 6 9 30 - 7 50 44 - 5 9 46 159 0 0 - 5 41 53 10 56 29 40 236 -55 - 6 2 31 - 5 21 15 - 7 2 28 - 4 21 32 160 0 0 - 4 53 36 10 56 36 39 236 -56 - 5 14 14 - 4 32 59 - 6 14 9 - 3 33 17 161 0 0 - 4 5 21 10 56 42 37 236 -57 - 4 25 58 - 3 44 44 - 5 25 51 - 2 45 5 162 0 0 - 3 17 8 10 56 49 36 236 -58 - 3 37 44 - 2 56 33 - 4 37 34 - 1 56 56 163 0 0 - 2 29 0 10 56 55 35 235 -59 - 2 49 35 - 2 8 27 - 3 49 21 - 1 8 54 164 0 0 - 1 41 0 10 57 1 34 235 -60 - 2 1 33 - 1 20 28 - 3 1 14 - 0 21 0 165 0 0 - 0 53 9 10 57 7 32 235 -62 - 1 13 40 - 0 32 39 - 2 13 16 0 26 44 166 0 0 - 0 5 30 10 57 13 31 235 -63 - 0 25 59 0 14 59 - 1 25 29 1 14 15 167 0 0 0 41 57 10 57 18 30 235 -64 0 21 30 1 2 23 - 0 37 54 2 1 33 168 0 0 1 29 8 10 57 23 28 235 -65 1 8 43 1 49 31 0 9 27 2 48 33 169 0 0 2 16 1 10 57 28 27 235 -66 1 55 40 2 36 22 0 56 32 3 35 16 170 0 0 3 2 36 10 57 33 26 235 -67 2 42 17 3 22 53 1 43 18 4 21 40 171 0 0 3 48 50 10 57 38 25 235 -68 3 28 34 4 9 4 2 29 44 5 7 41 172 0 0 4 34 41 10 57 42 23 235 -69 4 14 29 4 54 52 3 15 49 5 53 20 173 0 0 5 20 9 10 57 46 22 235 -70 5 0 0 5 40 16 4 1 30 6 38 33 174 0 0 6 5 10 10 57 50 21 235 -71 5 45 6 6 25 14 4 46 46 7 23 21 175 0 0 6 49 45 10 57 54 20 236 -72 6 29 44 7 9 45 5 31 36 8 7 40 176 0 0 7 33 51 10 57 57 18 236 -73 7 13 54 7 53 47 6 15 58 8 51 31 177 0 0 8 17 28 10 58 0 17 236 -73 7 57 35 8 37 19 6 59 50 9 34 51 178 0 0 9 0 33 10 58 3 16 236 -74 8 40 44 9 20 21 7 43 12 10 17 40 179 0 0 9 43 6 10 58 6 15 236 -75 9 23 22 10 2 49 8 26 3 10 59 56 180 0 0 10 25 6 10 58 8 13 236 -75 10 5 26 10 44 45 9 8 20 11 41 39 -179 0 0 11 6 32 10 58 10 12 236 -76 10 46 57 11 26 6 9 50 4 12 22 47 -178 0 0 11 47 23 10 58 12 11 237 -76 11 27 52 12 6 52 10 31 13 13 3 20 -177 0 0 12 27 37 10 58 14 10 237 -77 12 8 12 12 47 2 11 11 46 13 43 16 -176 0 0 13 7 15 10 58 16 9 237 -77 12 47 54 13 26 36 11 51 42 14 22 36 -175 0 0 13 46 16 10 58 17 7 237 -77 13 27 0 14 5 31 12 31 2 15 1 18 -174 0 0 14 24 39 10 58 18 6 238 -77 14 5 27 14 43 49 13 9 44 15 39 21 -173 0 0 15 2 23 10 58 19 5 238 -77 14 43 16 15 21 28 13 47 47 16 16 46 -172 0 0 15 39 28 10 58 20 4 238 -77 15 20 26 15 58 28 14 25 11 16 53 32 -171 0 0 16 15 53 10 58 21 3 238 -77 15 56 57 16 34 49 15 1 56 17 29 38 -170 0 0 16 51 39 10 58 21 2 239 -76 16 32 47 17 10 29 15 38 1 18 5 5 -169 0 0 17 26 44 10 58 21 1 239 -76 17 7 57 17 45 30 16 13 26 .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 19780680 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 06 19.2923 DE: -29 17 55.780 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .049, .049 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (337) Devosa approx. diameter [km]: 59 approx. diameter ["]: .035 distance from Earth [AU]: 2.34200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 917 number of rejected observations: 116 time covered by the observations: 1903 Sep 23 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 81° remarks: * orbital elements for (337) Devosa : Mean anomaly = 221.96432634 deg Arg. of pericenter = 98.27376852 deg Long. of node = 355.52728119 deg Inclination = 7.85150032 deg Eccentricity = 0.13750116 Semimajor axis = 2.38427855 AU Perihelion dist = 2.05643748 AU Mag: H = 8.68, G = 0.19 Epoch of elements : MJD 55105.45200000 TDT (2009 Oct 01.452) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 1 337 Devosa 10h 50.4m UT 11.8 19 6 19.292-29 17 55.78UCAC2 19780680 0.0 13.7 59 4.4 2.342 1.959 11.98 113.6709 -29.302 14.81 -3.33 10.8402 0.03433 -0.07487 6.82252 3.19244 0.00558 0.00071 2000 220.5047582009 926.00000 98.273769355.527281 7.8515000.13750116 2.3842786 2.0564375 8.7 5.00.19 RATE 2.6771240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.050 89 2.45 0.050 0 54545.5020091001_780680 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org