IOTA/IOTA-ES occultation update for (983) Gunila / UCAC2 39436325 event on 2008 Dec 06, 13:04 UT Visible from Tasmania Summary ------- On 2008 Dec 06 UT, the 74 km diameter asteroid (983) Gunila will occult a 11.7 mag star in the constellation Taurus for observers along a path across Tasmania. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.5 mag (the magnitude of the asteroid) for at most 4.7 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: 68 * date and approx. time of event: 2008 Dec 06, 13:00 - 2008 Dec 06, 13:08 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.7 * Moon: 57 % sunlit, 76° distance * Sun: 174° distance * rough path description: Tasmania The occultation path -------------------- * approximate projected width [km]: 122 * 1 sigma uncertainty interval [path widths]: +/- 0.88 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .032", 91° ) * approx speed of asteroid's shadow [km/s]: 15.8134 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39436325 by 983 Gunila on 2008 Dec 6 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 123 52 31 -62 0 0 13 8 55 3 28 -1 122 29 39 125 15 46 ... .. .. 127 43 24 125 9 51 -61 0 0 13 8 54 4 27 -2 123 49 13 126 30 53 ... .. .. 128 54 41 126 26 8 -60 0 0 13 8 53 5 26 -3 125 7 32 127 45 10 ... .. .. 130 5 28 127 41 35 -59 0 0 13 8 52 6 25 -4 126 24 51 128 58 47 124 10 45 131 15 53 128 56 22 -58 0 0 13 8 50 7 24 -5 127 41 19 130 11 53 125 30 15 132 26 5 130 10 39 -57 0 0 13 8 48 9 22 -7 128 57 8 131 24 39 126 48 49 133 36 12 131 24 34 -56 0 0 13 8 46 10 21 -8 130 12 28 132 37 11 128 6 39 134 46 21 132 38 17 -55 0 0 13 8 43 11 20 -9 131 27 27 133 49 39 129 23 55 135 56 38 133 51 55 -54 0 0 13 8 40 12 19 -10 132 42 14 135 2 8 130 40 46 137 7 10 135 5 35 -53 0 0 13 8 37 13 18 -11 133 56 56 136 14 47 131 57 21 138 18 4 136 19 25 -52 0 0 13 8 34 15 17 -13 135 11 42 137 27 43 133 13 47 139 29 26 137 33 31 -51 0 0 13 8 30 16 16 -14 136 26 38 138 41 1 134 30 13 140 41 21 138 48 1 -50 0 0 13 8 26 17 15 -15 137 41 51 139 54 48 135 46 46 141 53 57 140 3 1 -49 0 0 13 8 21 18 14 -16 138 57 29 141 9 12 137 3 33 143 7 20 141 18 39 -48 0 0 13 8 17 19 13 -17 140 13 38 142 24 18 138 20 42 144 21 35 142 35 0 -47 0 0 13 8 12 20 12 -19 141 30 26 143 40 14 139 38 20 145 36 51 143 52 12 -46 0 0 13 8 6 22 10 -20 142 48 0 144 57 7 140 56 35 146 53 14 145 10 23 -45 0 0 13 8 0 23 9 -21 144 6 26 146 15 4 142 15 33 148 10 52 146 29 40 -44 0 0 13 7 54 24 8 -22 145 25 53 147 34 14 143 35 22 149 29 53 147 50 12 -43 0 0 13 7 47 25 7 -23 146 46 29 148 54 44 144 56 10 150 50 26 149 12 8 -42 0 0 13 7 40 26 5 -25 148 8 23 150 16 44 146 18 5 152 12 40 150 35 36 -41 0 0 13 7 33 27 4 -26 149 31 43 151 40 23 147 41 16 153 36 47 152 0 48 -40 0 0 13 7 25 28 3 -27 150 56 40 153 5 54 149 5 54 155 2 58 153 27 55 -39 0 0 13 7 17 29 1 -28 152 23 24 154 33 27 150 32 7 156 31 27 154 57 10 -38 0 0 13 7 8 30 360 -29 153 52 9 156 3 16 152 0 7 158 2 28 156 28 47 -37 0 0 13 6 59 31 358 -30 155 23 7 157 35 37 153 30 7 159 36 20 158 3 4 -36 0 0 13 6 50 32 356 -32 156 56 35 159 10 48 155 2 21 161 13 23 159 40 19 -35 0 0 13 6 39 33 355 -33 158 32 50 160 49 10 156 37 4 162 54 1 161 20 54 -34 0 0 13 6 29 34 353 -34 160 12 12 162 31 7 158 14 35 164 38 43 163 5 17 -33 0 0 13 6 17 35 351 -35 161 55 7 164 17 7 159 55 15 166 28 5 164 54 0 -32 0 0 13 6 5 35 349 -35 163 42 3 166 7 48 161 39 29 168 22 49 166 47 41 -31 0 0 13 5 53 36 346 -36 165 33 35 168 3 53 163 27 45 170 23 52 168 47 10 -30 0 0 13 5 40 36 344 -37 167 30 28 170 6 18 165 20 41 172 32 27 170 53 30 -29 0 0 13 5 25 37 341 -38 169 33 36 172 16 17 167 19 0 174 50 10 Latitude Latitude Latitude Latitude 171 0 0 -28 57 1 13 5 25 37 341 -38 -28 19 53 -29 34 45 -27 15 54 -30 42 45 172 0 0 -28 29 51 13 5 18 37 340 -38 -27 52 59 -29 7 18 -26 49 27 -30 14 47 173 0 0 -28 3 30 13 5 11 37 339 -38 -27 26 53 -28 40 41 -26 23 47 -29 47 38 174 0 0 -27 37 57 13 5 4 37 338 -38 -27 1 35 -28 14 52 -25 58 53 -29 21 21 175 0 0 -27 13 12 13 4 58 37 337 -39 -26 37 5 -27 49 53 -25 34 47 -28 55 53 176 0 0 -26 49 17 13 4 51 37 335 -39 -26 13 23 -27 25 43 -25 11 27 -28 31 16 177 0 0 -26 26 10 13 4 44 37 334 -39 -25 50 29 -27 2 22 -24 48 55 -28 7 30 178 0 0 -26 3 51 13 4 38 37 333 -39 -25 28 23 -26 39 51 -24 27 10 -27 44 34 179 0 0 -25 42 22 13 4 31 37 332 -39 -25 7 6 -26 18 9 -24 6 12 -27 22 28 180 0 0 -25 21 41 13 4 24 37 331 -39 -24 46 36 -25 57 16 -23 46 2 -27 1 13 -179 0 0 -25 1 49 13 4 18 37 330 -39 -24 26 55 -25 37 13 -23 26 39 -26 40 48 -178 0 0 -24 42 45 13 4 11 37 329 -39 -24 8 2 -25 17 58 -23 8 3 -26 21 14 -177 0 0 -24 24 31 13 4 5 36 328 -39 -23 49 57 -24 59 34 -22 50 15 -26 2 30 -176 0 0 -24 7 5 13 3 58 36 327 -39 -23 32 41 -24 41 58 -22 33 14 -25 44 36 -175 0 0 -23 50 28 13 3 52 36 325 -39 -23 16 13 -24 25 12 -22 17 0 -25 27 33 -174 0 0 -23 34 40 13 3 46 36 324 -38 -23 0 33 -24 9 15 -22 1 34 -25 11 19 -173 0 0 -23 19 41 13 3 39 35 323 -38 -22 45 41 -23 54 7 -21 46 56 -24 55 57 -172 0 0 -23 5 30 13 3 33 35 322 -38 -22 31 38 -23 39 49 -21 33 5 -24 41 24 -171 0 0 -22 52 8 13 3 27 35 322 -38 -22 18 23 -23 26 20 -21 20 1 -24 27 41 -170 0 0 -22 39 35 13 3 21 34 321 -37 -22 5 56 -23 13 40 -21 7 45 -24 14 49 -169 0 0 -22 27 50 13 3 15 34 320 -37 -21 54 18 -23 1 49 -20 56 17 -24 2 47 -168 0 0 -22 16 54 13 3 9 33 319 -37 -21 43 27 -22 50 48 -20 45 35 -23 51 34 -167 0 0 -22 6 47 13 3 3 33 318 -36 -21 33 25 -22 40 36 -20 35 42 -23 41 12 -166 0 0 -21 57 29 13 2 58 32 317 -36 -21 24 12 -22 31 12 -20 26 36 -23 31 40 -165 0 0 -21 48 59 13 2 52 32 316 -35 -21 15 46 -22 22 38 -20 18 17 -23 22 58 -164 0 0 -21 41 18 13 2 46 31 315 -35 -21 8 9 -22 14 54 -20 10 46 -23 15 7 -163 0 0 -21 34 26 13 2 41 31 315 -34 -21 1 20 -22 7 58 -20 4 3 -23 8 5 -162 0 0 -21 28 23 13 2 35 30 314 -34 -20 55 19 -22 1 52 -19 58 7 -23 1 53 -161 0 0 -21 23 8 13 2 30 30 313 -33 -20 50 7 -21 56 35 -19 52 59 -22 56 31 -160 0 0 -21 18 43 13 2 25 29 312 -33 -20 45 43 -21 52 7 -19 48 38 -22 52 0 -159 0 0 -21 15 6 13 2 20 28 312 -32 -20 42 8 -21 48 29 -19 45 5 -22 48 18 -158 0 0 -21 12 18 13 2 15 28 311 -32 -20 39 21 -21 45 39 -19 42 20 -22 45 27 -157 0 0 -21 10 19 13 2 10 27 310 -31 -20 37 23 -21 43 40 -19 40 22 -22 43 26 -156 0 0 -21 9 9 13 2 5 26 310 -30 -20 36 13 -21 42 29 -19 39 13 -22 42 16 -155 0 0 -21 8 48 13 2 1 26 309 -30 -20 35 51 -21 42 9 -19 38 51 -22 41 55 -154 0 0 -21 9 16 13 1 56 25 308 -29 -20 36 19 -21 42 38 -19 39 18 -22 42 26 -153 0 0 -21 10 33 13 1 52 24 308 -28 -20 37 35 -21 43 56 -19 40 32 -22 43 46 -152 0 0 -21 12 40 13 1 47 23 307 -28 -20 39 40 -21 46 5 -19 42 35 -22 45 58 -151 0 0 -21 15 36 13 1 43 23 307 -27 -20 42 34 -21 49 3 -19 45 25 -22 49 0 -150 0 0 -21 19 22 13 1 39 22 306 -26 -20 46 18 -21 52 51 -19 49 4 -22 52 53 -149 0 0 -21 23 57 13 1 35 21 305 -25 -20 50 50 -21 57 29 -19 53 32 -22 57 37 -148 0 0 -21 29 22 13 1 31 20 305 -25 -20 56 11 -22 2 57 -19 58 48 -23 3 11 -147 0 0 -21 35 36 13 1 28 19 304 -24 -21 2 22 -22 9 16 -20 4 52 -23 9 37 -146 0 0 -21 42 41 13 1 24 19 304 -23 -21 9 23 -22 16 25 -20 11 45 -23 16 55 -145 0 0 -21 50 36 13 1 21 18 303 -22 -21 17 13 -22 24 25 -20 19 28 -23 25 4 -144 0 0 -21 59 21 13 1 18 17 303 -22 -21 25 53 -22 33 15 -20 27 59 -23 34 4 -143 0 0 -22 8 56 13 1 15 16 302 -21 -21 35 22 -22 42 56 -20 37 19 -23 43 56 -142 0 0 -22 19 22 13 1 12 15 302 -20 -21 45 42 -22 53 29 -20 47 28 -23 54 40 -141 0 0 -22 30 38 13 1 9 14 302 -19 -21 56 52 -23 4 52 -20 58 27 -24 6 17 -140 0 0 -22 42 46 13 1 6 13 301 -18 -22 8 52 -23 17 7 -21 10 15 -24 18 45 -139 0 0 -22 55 44 13 1 4 13 301 -17 -22 21 42 -23 30 13 -21 22 53 -24 32 6 -138 0 0 -23 9 33 13 1 2 12 300 -16 -22 35 23 -23 44 11 -21 36 21 -24 46 20 -137 0 0 -23 24 14 13 1 0 11 300 -15 -22 49 55 -23 59 0 -21 50 38 -25 1 26 -136 0 0 -23 39 45 13 0 58 10 299 -15 -23 5 18 -24 14 42 -22 5 45 -25 17 26 -135 0 0 -23 56 9 13 0 56 9 299 -14 -23 21 32 -24 31 15 -22 21 43 -25 34 18 -134 0 0 -24 13 24 13 0 54 8 298 -13 -23 38 37 -24 48 41 -22 38 31 -25 52 4 -133 0 0 -24 31 31 13 0 53 7 298 -12 -23 56 33 -25 7 0 -22 56 9 -26 10 43 -132 0 0 -24 50 30 13 0 52 6 298 -11 -24 15 21 -25 26 11 -23 14 38 -26 30 17 -131 0 0 -25 10 22 13 0 50 5 297 -10 -24 35 0 -25 46 14 .. .. .. -26 50 44 -130 0 0 -25 31 5 13 0 50 4 297 -9 -24 55 31 -26 7 11 .. .. .. -27 12 5 -129 0 0 -25 52 41 13 0 49 3 296 -8 -25 16 54 -26 29 1 .. .. .. -27 34 20 -128 0 0 -26 15 10 13 0 48 2 296 -7 -25 39 9 -26 51 43 .. .. .. -27 57 30 -127 0 0 -26 38 31 13 0 48 1 295 -6 -26 2 16 -27 15 20 .. .. .. -28 21 35 -126 0 0 -27 2 45 13 0 48 0 295 -5 -26 26 14 -27 39 49 .. .. .. .. .. .. Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: UCAC2 39436325 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 27 40.4385 DE: +21 57 05.642 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .045, .027 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (983) Gunila approx. diameter [km]: 74 approx. diameter ["]: .041 distance from Earth [AU]: 2.47500 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 724 number of rejected observations: 41 time covered by the observations: 1922 Jul 31 - 2008 Oct 26 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.017, 96° remarks: * orbital elements for (983) Gunila : Mean anomaly = 192.25808769 deg Arg. of pericenter = 349.27333408 deg Long. of node = 250.93038758 deg Inclination = 14.87596068 deg Eccentricity = 0.09639248 Semimajor axis = 3.15811406 AU Perihelion dist = 2.85369562 AU Mag: H = 9.33, G = 0.15 Epoch of elements : MJD 54806.54500000 TDT (2008 Dec 06.545) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 6 983 Gunila 13h 4.9m UT 11.7 4 27 40.439 21 57 5.64UCAC2 39436325 0.0 14.5 74 4.7 2.475 -2.092 -12.56 155.0107 21.954 -18.41 -22.57 13.0812 0.31463 -0.72954 -8.19561 -3.53504 0.00066 0.00008 2000 191.10868620081130.00000349.273334250.930388 14.8759610.09639248 3.1581141 2.8536956 9.6 5.00.15 RATE 1.7561530 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.032 91 1.88 0.036 0 54796.5020081206_436325 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org