IOTA/IOTA-ES occultation update for (3598) Saucier / TYC 5811-01366-1 event on 2012 Dec 04, 22:24 UT Visible from Africa,Venezuela Summary ------- On 2012 Dec 04 UT, the 26 km diameter asteroid (3598) Saucier will occult a 9.4 mag star in the constellation Aquarius for observers along a path across Africa,Venezuela. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.7 mag to 18.1 mag (the magnitude of the asteroid) for at most 1.4 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: 21 * date and approx. time of event: 2012 Dec 04, 22:24 - 2012 Dec 04, 22:29 UT * geocentric midpoint of event [JD]: 2456266.43345 * magnitude of target star: 9.4 * magnitude drop [mag]: 8.7 * estimated maximum duration [s]: 1.4 * Moon: 68 % sunlit, 163° distance * Sun: 84° distance * rough path description: Africa,Venezuela The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 3.22 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .035", 74° ) * approx speed of asteroid's shadow [km/s]: 18.6935 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5811-01366-1 by 3598 Saucier on 2012 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 ' " Latitude Latitude Latitude Latitude - 70 0 0 5 48 7 22 24 47 75 184 -1 5 40 16 5 55 59 4 49 47 6 46 42 - 69 0 0 6 13 23 22 24 53 75 188 -2 6 5 31 6 21 15 5 15 0 7 12 2 - 68 0 0 6 38 49 22 25 0 74 191 -3 6 30 57 6 46 42 5 40 22 7 37 31 - 67 0 0 7 4 25 22 25 6 74 194 -4 6 56 32 7 12 18 6 5 54 8 3 10 - 66 0 0 7 30 9 22 25 13 73 197 -5 7 22 16 7 38 2 6 31 35 8 28 58 - 65 0 0 7 56 1 22 25 19 72 200 -6 7 48 7 8 3 55 6 57 24 8 54 53 - 64 0 0 8 22 0 22 25 25 71 203 -7 8 14 6 8 29 54 7 23 20 9 20 55 - 63 0 0 8 48 6 22 25 32 71 205 -9 8 40 11 8 56 0 7 49 23 9 47 3 - 62 0 0 9 14 17 22 25 38 70 207 -10 9 6 22 9 22 12 8 15 32 10 13 17 - 61 0 0 9 40 33 22 25 44 69 209 -11 9 32 39 9 48 29 8 41 46 10 39 36 - 60 0 0 10 6 54 22 25 51 68 211 -12 9 58 59 10 14 50 9 8 5 11 5 59 - 59 0 0 10 33 19 22 25 57 67 213 -13 10 25 23 10 41 14 9 34 28 11 32 25 - 58 0 0 10 59 46 22 26 3 66 214 -14 10 51 50 11 7 42 10 0 54 11 58 54 - 57 0 0 11 26 15 22 26 9 65 216 -15 11 18 20 11 34 12 10 27 22 12 25 24 - 56 0 0 11 52 46 22 26 15 64 217 -16 11 44 50 12 0 43 10 53 51 12 51 56 - 55 0 0 12 19 18 22 26 21 63 218 -17 12 11 22 12 27 14 11 20 22 13 18 29 - 54 0 0 12 45 49 22 26 27 62 220 -18 12 37 53 12 53 46 11 46 53 13 45 1 - 53 0 0 13 12 20 22 26 33 61 221 -20 13 4 24 13 20 17 12 13 23 14 11 32 - 52 0 0 13 38 49 22 26 39 60 222 -21 13 30 53 13 46 46 12 39 52 14 38 1 - 51 0 0 14 5 16 22 26 45 59 223 -22 13 57 20 14 13 13 13 6 19 15 4 28 - 50 0 0 14 31 40 22 26 50 58 224 -23 14 23 44 14 39 37 13 32 43 15 30 52 - 49 0 0 14 58 1 22 26 56 57 225 -24 14 50 4 15 5 57 13 59 4 15 57 12 - 48 0 0 15 24 17 22 27 2 56 225 -25 15 16 20 15 32 13 14 25 21 16 23 27 - 47 0 0 15 50 28 22 27 7 55 226 -26 15 42 32 15 58 24 14 51 33 16 49 37 - 46 0 0 16 16 33 22 27 12 54 227 -27 16 8 37 16 24 29 15 17 39 17 15 41 - 45 0 0 16 42 32 22 27 18 53 228 -28 16 34 36 16 50 28 15 43 40 17 41 39 - 44 0 0 17 8 23 22 27 23 52 229 -29 17 0 28 17 16 19 16 9 33 18 7 29 - 43 0 0 17 34 8 22 27 28 51 229 -30 17 26 12 17 42 3 16 35 19 18 33 11 - 42 0 0 17 59 43 22 27 33 50 230 -31 17 51 49 18 7 38 17 0 57 18 58 45 - 41 0 0 18 25 10 22 27 38 49 231 -32 18 17 16 18 33 5 17 26 26 19 24 9 - 40 0 0 18 50 27 22 27 43 48 231 -33 18 42 33 18 58 22 17 51 46 19 49 24 - 39 0 0 19 15 35 22 27 48 47 232 -34 19 7 41 19 23 29 18 16 56 20 14 28 - 38 0 0 19 40 31 22 27 52 46 233 -35 19 32 38 19 48 25 18 41 55 20 39 22 - 37 0 0 20 5 16 22 27 57 45 233 -36 19 57 23 20 13 9 19 6 43 21 4 4 - 36 0 0 20 29 49 22 28 1 44 234 -38 20 21 57 20 37 42 19 31 20 21 28 34 - 35 0 0 20 54 10 22 28 6 43 234 -39 20 46 18 21 2 3 19 55 44 21 52 51 - 34 0 0 21 18 18 22 28 10 42 235 -40 21 10 27 21 26 10 20 19 55 22 16 55 - 33 0 0 21 42 13 22 28 14 41 235 -41 21 34 22 21 50 4 20 43 54 22 40 46 - 32 0 0 22 5 54 22 28 18 40 236 -42 21 58 3 22 13 44 21 7 39 23 4 23 - 31 0 0 22 29 20 22 28 22 39 237 -43 22 21 30 22 37 10 21 31 9 23 27 45 - 30 0 0 22 52 32 22 28 26 38 237 -44 22 44 42 23 0 21 21 54 25 23 50 53 - 29 0 0 23 15 28 22 28 30 37 238 -45 23 7 39 23 23 17 22 17 26 24 13 45 - 28 0 0 23 38 9 22 28 33 36 238 -46 23 30 21 23 45 58 22 40 11 24 36 21 - 27 0 0 24 0 34 22 28 37 35 239 -46 23 52 46 24 8 22 23 2 41 24 58 41 - 26 0 0 24 22 43 22 28 40 34 239 -47 24 14 56 24 30 30 23 24 54 25 20 45 - 25 0 0 24 44 35 22 28 44 33 240 -48 24 36 48 24 52 21 23 46 51 25 42 32 - 24 0 0 25 6 9 22 28 47 32 240 -49 24 58 24 25 13 55 24 8 31 26 4 2 - 23 0 0 25 27 27 22 28 50 31 241 -50 25 19 42 25 35 12 24 29 53 26 25 14 - 22 0 0 25 48 27 22 28 53 30 241 -51 25 40 42 25 56 11 24 50 58 26 46 9 - 21 0 0 26 9 8 22 28 56 29 242 -52 26 1 25 26 16 52 25 11 45 27 6 46 - 20 0 0 26 29 32 22 28 59 28 242 -53 26 21 49 26 37 15 25 32 14 27 27 4 - 19 0 0 26 49 37 22 29 2 27 243 -54 26 41 55 26 57 20 25 52 24 27 47 4 - 18 0 0 27 9 24 22 29 5 27 243 -55 27 1 42 27 17 5 26 12 16 28 6 45 - 17 0 0 27 28 51 22 29 7 26 244 -56 27 21 10 27 36 32 26 31 49 28 26 6 - 16 0 0 27 47 59 22 29 10 25 244 -57 27 40 19 27 55 39 26 51 3 28 45 9 - 15 0 0 28 6 48 22 29 12 24 245 -58 27 59 9 28 14 28 27 9 57 29 3 53 - 14 0 0 28 25 17 22 29 14 23 245 -58 28 17 39 28 32 56 27 28 32 29 22 16 - 13 0 0 28 43 27 22 29 16 22 246 -59 28 35 49 28 51 5 27 46 47 29 40 20 - 12 0 0 29 1 17 22 29 18 21 246 -60 28 53 40 29 8 54 28 4 42 29 58 4 - 11 0 0 29 18 46 22 29 20 20 247 -61 29 11 10 29 26 23 28 22 18 30 15 29 - 10 0 0 29 35 56 22 29 22 19 248 -62 29 28 21 29 43 32 28 39 33 30 32 33 - 9 0 0 29 52 45 22 29 24 18 248 -63 29 45 11 30 0 20 28 56 28 30 49 16 - 8 0 0 30 9 14 22 29 26 17 249 -63 30 1 40 30 16 49 29 13 2 31 5 40 - 7 0 0 30 25 23 22 29 27 16 249 -64 30 17 50 30 32 56 29 29 16 31 21 43 - 6 0 0 30 41 11 22 29 29 15 250 -65 30 33 38 30 48 43 29 45 9 31 37 25 - 5 0 0 30 56 38 22 29 30 14 250 -66 30 49 6 31 4 10 30 0 42 31 52 47 - 4 0 0 31 11 44 22 29 32 14 251 -67 31 4 13 31 19 16 30 15 54 32 7 48 - 3 0 0 31 26 30 22 29 33 13 251 -67 31 19 0 31 34 1 30 30 45 32 22 28 - 2 0 0 31 40 55 22 29 34 12 252 -68 31 33 26 31 48 25 30 45 15 32 36 48 - 1 0 0 31 54 59 22 29 35 11 252 -69 31 47 30 32 2 28 30 59 24 32 50 47 0 0 0 32 8 42 22 29 36 10 253 -70 32 1 14 32 16 11 31 13 13 33 4 25 1 0 0 32 22 5 22 29 37 9 253 -70 32 14 37 32 29 32 31 26 40 33 17 42 2 0 0 32 35 6 22 29 38 8 254 -71 32 27 39 32 42 33 31 39 46 33 30 38 3 0 0 32 47 46 22 29 39 7 254 -71 32 40 20 32 55 13 31 52 31 33 43 13 4 0 0 33 0 6 22 29 39 7 255 -72 32 52 40 33 7 31 32 4 56 33 55 28 5 0 0 33 12 4 22 29 40 6 256 -73 33 4 39 33 19 29 32 16 59 34 7 21 6 0 0 33 23 41 22 29 40 5 256 -73 33 16 17 33 31 6 32 28 41 34 18 54 7 0 0 33 34 58 22 29 41 4 257 -74 33 27 34 33 42 21 32 40 1 34 30 6 8 0 0 33 45 53 22 29 41 3 257 -74 33 38 30 33 53 16 32 51 1 34 40 57 9 0 0 33 56 27 22 29 41 2 258 -75 33 49 5 34 3 50 33 1 40 34 51 27 10 0 0 34 6 41 22 29 41 1 258 -75 33 59 19 34 14 3 33 11 58 35 1 36 11 0 0 34 16 33 22 29 41 1 259 -76 34 9 12 34 23 55 .. .. .. 35 11 24 Uncertainty in time = +/- 7 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 5811-01366-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 36 43.3432 DE: -08 56 54.380 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .022 ) * V mag [mag]: 9.4 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3598) Saucier approx. diameter [km]: 26 approx. diameter ["]: .011 distance from Earth [AU]: 3.28800 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1208 number of rejected observations: 21 time covered by the observations: 1977 May 18 - 2012 Apr 20 1 sigma uncertainty ellipse (major, minor, PA): 0.047, 0.028, 69° remarks: * orbital elements for (3598) Saucier : Mean anomaly = 115.70067160 deg Arg. of pericenter = 67.05472745 deg Long. of node = 161.72477125 deg Inclination = 0.77997039 deg Eccentricity = 0.10299999 Semimajor axis = 3.17234467 AU Perihelion dist = 2.84559321 AU Mag: H = 12.04, G = 0.15 Epoch of elements : MJD 56265.93300000 TDT (2012 Dec 04.933) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 4 3598 Saucier 22h 24.2m UT 9.4 22 36 43.343- 8 56 54.38TYC 5811-01366-1 10.6 18.1 26 1.4 3.288 1.773 10.31 -70.9937 -8.951 -158.40 -22.38 22.4028 -0.08275 0.21366 9.82223 3.85366 0.00558 0.00223 2000 114.66574920121129.00000 67.054727161.724771 0.7799700.10299999 3.1723447 2.845593212.0 5.00.15 RATE 1.7443500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.035 74 4.22 0.035 0 0 2 0 056264.0020121204_1366-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 04:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org