IOTA/IOTA-ES occultation update for (823) Sisigambis / HIP 23589 event on 2008 Apr 03, 03:42 UT Visible from N Canada Summary ------- On 2008 Apr 03 UT, the 15 km diameter asteroid (823) Sisigambis will occult a 6.2 mag star in the constellation Taurus for observers along a path across N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 9.5 mag to 15.7 mag (the magnitude of the asteroid) for at most 0.5 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: . The event at a glimpse ---------------------- * Rank: 45 * date and approx. time of event: 2008 Apr 03, 03:42 - 2008 Apr 03, 03:44 UT * midpoint of event [JD]: 2454559.65424167 * magnitude of target star: 6.2 * magnitude drop [mag]: 9.5 * estimated maximum duration [s]: 0.5 * Moon: 12 % sunlit, 103° distance * Sun: 63° distance * rough path description: N Canada The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .013) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .013", 89° ) * approx speed of asteroid's shadow [km/s]: 32.3151 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 23589 by 823 Sisigambis on 2008 Apr 3 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 Latitude Latitude Latitude Latitude -127 0 0 72 46 23 3 42 59 33 231 0 72 39 19 72 53 27 72 18 56 73 14 7 -126 0 0 72 39 57 3 43 0 33 232 0 72 32 52 72 47 3 72 12 25 73 7 47 -125 0 0 72 33 18 3 43 1 33 233 -1 72 26 11 72 40 25 72 5 40 73 1 14 -124 0 0 72 26 24 3 43 2 32 234 -1 72 19 16 72 33 33 71 58 41 72 54 26 -123 0 0 72 19 16 3 43 3 32 236 -1 72 12 6 72 26 27 71 51 27 72 47 25 -122 0 0 72 11 54 3 43 4 32 237 -2 72 4 42 72 19 6 71 43 58 72 40 9 -121 0 0 72 4 16 3 43 5 32 238 -2 71 57 3 72 11 31 71 36 15 72 32 38 -120 0 0 71 56 24 3 43 6 32 239 -2 71 49 9 72 3 40 71 28 16 72 24 52 -119 0 0 71 48 17 3 43 7 31 240 -3 71 41 0 71 55 35 71 20 2 72 16 52 -118 0 0 71 39 54 3 43 8 31 241 -3 71 32 36 71 47 13 71 11 32 72 8 36 -117 0 0 71 31 15 3 43 9 31 242 -3 71 23 55 71 38 37 71 2 47 72 0 4 -116 0 0 71 22 21 3 43 10 31 243 -4 71 14 59 71 29 44 70 53 46 71 51 17 -115 0 0 71 13 10 3 43 11 31 245 -4 71 5 46 71 20 35 70 44 28 71 42 13 -114 0 0 71 3 43 3 43 12 30 246 -4 70 56 17 71 11 9 70 34 54 71 32 53 -113 0 0 70 53 59 3 43 13 30 247 -5 70 46 32 71 1 27 70 25 3 71 23 16 -112 0 0 70 43 58 3 43 14 30 248 -5 70 36 29 70 51 28 70 14 55 71 13 23 -111 0 0 70 33 40 3 43 15 30 249 -6 70 26 9 70 41 12 70 4 29 71 3 12 -110 0 0 70 23 4 3 43 17 29 250 -6 70 15 31 70 30 38 69 53 46 70 52 44 -109 0 0 70 12 11 3 43 18 29 251 -6 70 4 36 70 19 47 69 42 46 70 41 58 -108 0 0 70 0 59 3 43 19 29 252 -7 69 53 23 70 8 37 69 31 27 70 30 55 -107 0 0 69 49 30 3 43 20 29 253 -7 69 41 51 69 57 10 69 19 50 70 19 33 -106 0 0 69 37 41 3 43 21 28 255 -7 69 30 1 69 45 23 69 7 54 70 7 52 -105 0 0 69 25 35 3 43 22 28 256 -8 69 17 52 69 33 19 68 55 40 69 55 53 -104 0 0 69 13 9 3 43 23 28 257 -8 69 5 24 69 20 55 68 43 7 69 43 35 -103 0 0 69 0 24 3 43 24 27 258 -9 68 52 37 69 8 11 68 30 14 69 30 57 -102 0 0 68 47 19 3 43 25 27 259 -9 68 39 31 68 55 9 68 17 2 69 18 0 -101 0 0 68 33 55 3 43 26 27 260 -10 68 26 5 68 41 46 68 3 31 69 4 44 -100 0 0 68 20 10 3 43 27 26 261 -10 68 12 18 68 28 4 67 49 39 68 51 7 - 99 0 0 68 6 6 3 43 29 26 262 -10 67 58 12 68 14 2 67 35 27 68 37 10 - 98 0 0 67 51 41 3 43 30 26 263 -11 67 43 46 67 59 39 67 20 56 68 22 53 - 97 0 0 67 36 56 3 43 31 25 264 -11 67 28 59 67 44 55 67 6 3 68 8 15 - 96 0 0 67 21 50 3 43 32 25 265 -12 67 13 51 67 29 51 66 50 50 67 53 16 - 95 0 0 67 6 23 3 43 33 25 266 -12 66 58 22 67 14 26 66 35 17 67 37 57 - 94 0 0 66 50 35 3 43 34 24 267 -13 66 42 32 66 58 40 66 19 22 67 22 16 - 93 0 0 66 34 26 3 43 35 24 268 -13 66 26 22 66 42 33 66 3 6 67 6 14 - 92 0 0 66 17 56 3 43 36 24 270 -14 66 9 50 66 26 4 65 46 30 66 49 50 - 91 0 0 66 1 4 3 43 38 23 271 -14 65 52 56 66 9 14 65 29 32 66 33 5 - 90 0 0 65 43 51 3 43 39 23 272 -15 65 35 41 65 52 2 65 12 12 66 15 58 - 89 0 0 65 26 16 3 43 40 22 273 -15 65 18 5 65 34 29 64 54 32 65 58 29 - 88 0 0 65 8 20 3 43 41 22 274 -15 65 0 8 65 16 34 64 36 30 65 40 39 - 87 0 0 64 50 2 3 43 42 21 275 -16 64 41 48 64 58 18 64 18 7 65 22 27 - 86 0 0 64 31 23 3 43 43 21 276 -16 64 23 8 64 39 40 63 59 22 65 3 53 - 85 0 0 64 12 22 3 43 44 20 277 -17 64 4 6 64 20 41 63 40 16 64 44 58 - 84 0 0 63 53 0 3 43 45 20 278 -17 63 44 42 64 1 20 63 20 49 64 25 40 - 83 0 0 63 33 17 3 43 46 20 279 -18 63 24 58 63 41 37 63 1 1 64 6 1 - 82 0 0 63 13 12 3 43 47 19 280 -18 63 4 52 63 21 34 62 40 53 63 46 1 - 81 0 0 62 52 46 3 43 48 19 281 -19 62 44 25 63 1 9 62 20 23 63 25 40 - 80 0 0 62 32 0 3 43 49 18 282 -20 62 23 38 62 40 24 61 59 33 63 4 57 - 79 0 0 62 10 53 3 43 50 17 283 -20 62 2 30 62 19 18 61 38 23 62 43 53 - 78 0 0 61 49 26 3 43 51 17 284 -21 61 41 2 61 57 51 61 16 53 62 22 29 - 77 0 0 61 27 38 3 43 52 16 284 -21 61 19 14 61 36 5 60 55 3 62 0 45 - 76 0 0 61 5 31 3 43 53 16 285 -22 60 57 7 61 13 58 60 32 54 61 38 40 - 75 0 0 60 43 5 3 43 54 15 286 -22 60 34 40 60 51 33 60 10 26 61 16 16 - 74 0 0 60 20 20 3 43 55 15 287 -23 60 11 54 60 28 48 59 47 39 60 53 33 - 73 0 0 59 57 17 3 43 56 14 288 -23 59 48 51 60 5 45 59 24 34 60 30 31 - 72 0 0 59 33 55 3 43 57 13 289 -24 59 25 29 59 42 24 59 1 12 60 7 10 - 71 0 0 59 10 17 3 43 58 13 290 -24 59 1 50 59 18 45 58 37 33 59 43 32 - 70 0 0 58 46 21 3 43 59 12 291 -25 58 37 55 58 54 50 58 13 37 59 19 37 - 69 0 0 58 22 9 3 44 0 12 292 -25 58 13 43 58 30 38 57 49 25 58 55 24 - 68 0 0 57 57 42 3 44 0 11 293 -26 57 49 16 58 6 10 57 24 59 58 30 56 - 67 0 0 57 32 59 3 44 1 10 294 -26 57 24 33 57 41 28 57 0 17 58 6 13 - 66 0 0 57 8 3 3 44 2 10 294 -27 56 59 37 57 16 30 56 35 22 57 41 15 - 65 0 0 56 42 52 3 44 2 9 295 -27 56 34 27 56 51 20 56 10 13 57 16 3 - 64 0 0 56 17 29 3 44 3 8 296 -28 56 9 4 56 25 56 55 44 52 56 50 38 - 63 0 0 55 51 54 3 44 3 8 297 -28 55 43 30 56 0 20 55 19 19 56 25 0 - 62 0 0 55 26 8 3 44 4 7 298 -29 55 17 44 55 34 33 54 53 35 55 59 11 - 61 0 0 55 0 11 3 44 4 6 299 -29 54 51 48 55 8 36 54 27 41 55 33 11 - 60 0 0 54 34 5 3 44 5 5 299 -30 54 25 43 54 42 29 54 1 38 55 7 2 - 59 0 0 54 7 50 3 44 5 5 300 -30 53 59 29 54 16 13 53 35 27 54 40 43 - 58 0 0 53 41 27 3 44 6 4 301 -31 53 33 7 53 49 49 53 9 8 54 14 16 - 57 0 0 53 14 57 3 44 6 3 302 -31 53 6 39 53 23 18 52 42 43 53 47 42 - 56 0 0 52 48 22 3 44 6 2 303 -32 52 40 4 52 56 42 52 16 12 53 21 2 - 55 0 0 52 21 41 3 44 6 2 304 -32 52 13 25 52 30 0 .. .. .. 52 54 16 - 54 0 0 51 54 57 3 44 6 1 304 -33 51 46 42 52 3 14 .. .. .. 52 27 27 - 53 0 0 51 28 9 3 44 6 0 305 -33 51 19 56 51 36 25 .. .. .. 52 0 34 Uncertainty in time = +/- 1 secs [Prediction of 2008 Feb 28.0] Data for the target star ------------------------ * name: HIP 23589 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 04 21.5978 DE: +21 16 40.342 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .013, .008 ) * V mag [mag]: 6.2 * B mag [mag]: 7.5 * Apparent position with proper motion RA(deg): 76.2130340483 DE(deg): 21.2909409871 * Equation of equinoxes (radians) : 0.000041071326582 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (823) Sisigambis approx. diameter [km]: 15 approx. diameter ["]: .009 distance from Earth [AU]: 2.26100 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 787 number of rejected observations: 71 time covered by the observations: 1916 Apr 01 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.010, 89° remarks: * orbital elements for (823) Sisigambis : Mean anomaly = 351.55376332 deg Arg. of pericenter = 218.32179608 deg Long. of node = 255.20474700 deg Inclination = 3.64602941 deg Eccentricity = 0.09089802 Semimajor axis = 2.22136050 AU Perihelion dist = 2.01944324 AU Mag: H = 11.04, G = 0.15 Epoch of elements : MJD 54559.15400000 TDT (2008 Apr 03.154) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 823 Sisigambis 3h 42.1m UT 6.2 5 4 21.598 21 16 40.34HIP 23589 7.5 15.7 15 0.5 2.261 5.062 5.11 -171.2855 21.277 125.30 5.43 3.7018 -0.05815 0.79037 18.19201 1.31631 0.00475 0.00039 2000 348.8286382008 325.00000218.321796255.204747 3.6460290.09089802 2.2213605 2.019443211.2 5.00.15 RATE 2.9769770 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.013 89 2.45 0.013 0 54524.5020080403__23589 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 13:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org