IOTA/IOTA-ES occultation update for (663) Gerlinde / UCAC2 35341084 event on 2008 Mar 31, 02:27 UT Visible from NE Canada Summary ------- On 2008 Mar 31 UT, the 101 km diameter asteroid (663) Gerlinde will occult a 11.8 mag star in the constellation Orion for observers along a path across NE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.9 mag (the magnitude of the asteroid) for at most 4.2 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: 59 * date and approx. time of event: 2008 Mar 31, 02:28 - 2008 Mar 31, 02:30 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 4.2 * Moon: 39 % sunlit, 146° distance * Sun: 73° distance * rough path description: NE Canada The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 1.05 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .048", 91° ) * approx speed of asteroid's shadow [km/s]: 23.7754 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 35341084 by 663 Gerlinde on 2008 Mar 31 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 -119 0 0 56 50 34 2 28 24 40 211 0 56 12 23 57 29 11 54 53 30 58 51 42 -118 0 0 56 52 28 2 28 27 39 212 -1 56 14 18 57 31 4 54 55 26 58 53 34 -117 0 0 56 54 12 2 28 29 39 213 -1 56 16 2 57 32 47 54 57 12 58 55 15 -116 0 0 56 55 45 2 28 31 39 215 -2 56 17 36 57 34 19 54 58 46 58 56 47 -115 0 0 56 57 7 2 28 34 39 216 -2 56 18 59 57 35 41 55 0 10 58 58 8 -114 0 0 56 58 19 2 28 36 38 217 -3 56 20 11 57 36 53 55 1 24 58 59 18 -113 0 0 56 59 21 2 28 38 38 218 -4 56 21 13 57 37 54 55 2 26 59 0 19 -112 0 0 57 0 12 2 28 40 37 219 -4 56 22 5 57 38 45 55 3 18 59 1 9 -111 0 0 57 0 53 2 28 43 37 221 -5 56 22 46 57 39 26 55 4 0 59 1 49 -110 0 0 57 1 23 2 28 45 37 222 -5 56 23 16 57 39 56 55 4 30 59 2 19 -109 0 0 57 1 43 2 28 47 36 223 -6 56 23 36 57 40 16 55 4 51 59 2 39 -108 0 0 57 1 53 2 28 49 36 224 -6 56 23 46 57 40 25 55 5 0 59 2 48 -107 0 0 57 1 52 2 28 51 36 225 -7 56 23 45 57 40 24 55 4 59 59 2 47 -106 0 0 57 1 40 2 28 53 35 226 -7 56 23 33 57 40 13 55 4 47 59 2 36 -105 0 0 57 1 19 2 28 55 35 227 -8 56 23 11 57 39 51 55 4 25 59 2 15 -104 0 0 57 0 46 2 28 57 34 229 -8 56 22 39 57 39 19 55 3 52 59 1 44 -103 0 0 57 0 4 2 28 59 34 230 -9 56 21 56 57 38 37 55 3 8 59 1 2 -102 0 0 56 59 11 2 29 1 34 231 -9 56 21 2 57 37 44 55 2 14 59 0 10 -101 0 0 56 58 7 2 29 3 33 232 -10 56 19 58 57 36 41 55 1 9 58 59 8 -100 0 0 56 56 53 2 29 5 33 233 -10 56 18 44 57 35 28 54 59 53 58 57 56 - 99 0 0 56 55 29 2 29 7 32 234 -11 56 17 19 57 34 4 54 58 27 58 56 34 - 98 0 0 56 53 54 2 29 9 32 235 -11 56 15 43 57 32 30 54 56 51 58 55 1 - 97 0 0 56 52 9 2 29 11 31 236 -12 56 13 58 57 30 46 54 55 3 58 53 18 - 96 0 0 56 50 13 2 29 13 31 237 -12 56 12 1 57 28 51 54 53 5 58 51 25 - 95 0 0 56 48 7 2 29 15 31 238 -13 56 9 54 57 26 46 54 50 57 58 49 22 - 94 0 0 56 45 51 2 29 17 30 239 -13 56 7 37 57 24 30 54 48 38 58 47 9 - 93 0 0 56 43 24 2 29 19 30 240 -14 56 5 9 57 22 4 54 46 8 58 44 45 - 92 0 0 56 40 47 2 29 20 29 241 -14 56 2 31 57 19 28 54 43 28 58 42 11 - 91 0 0 56 37 59 2 29 22 29 242 -15 55 59 43 57 16 42 54 40 37 58 39 27 - 90 0 0 56 35 2 2 29 24 28 243 -15 55 56 43 57 13 45 54 37 36 58 36 33 - 89 0 0 56 31 53 2 29 26 28 244 -16 55 53 34 57 10 38 54 34 24 58 33 29 - 88 0 0 56 28 34 2 29 27 27 245 -16 55 50 14 57 7 21 54 31 2 58 30 14 - 87 0 0 56 25 5 2 29 29 27 246 -17 55 46 44 57 3 53 54 27 29 58 26 49 - 86 0 0 56 21 26 2 29 31 26 247 -17 55 43 3 57 0 15 54 23 45 58 23 14 - 85 0 0 56 17 36 2 29 32 26 248 -18 55 39 12 56 56 26 54 19 51 58 19 29 - 84 0 0 56 13 36 2 29 34 25 249 -18 55 35 10 56 52 28 54 15 47 58 15 34 - 83 0 0 56 9 26 2 29 36 25 250 -19 55 30 58 56 48 19 54 11 32 58 11 28 - 82 0 0 56 5 5 2 29 37 24 251 -19 55 26 36 56 44 0 54 7 6 58 7 13 - 81 0 0 56 0 34 2 29 39 24 252 -20 55 22 3 56 39 30 54 2 31 58 2 47 - 80 0 0 55 55 52 2 29 40 23 253 -20 55 17 20 56 34 50 53 57 44 57 58 11 - 79 0 0 55 51 1 2 29 42 23 254 -21 55 12 27 56 30 0 53 52 48 57 53 24 - 78 0 0 55 45 59 2 29 43 22 255 -21 55 7 23 56 25 0 53 47 40 57 48 28 - 77 0 0 55 40 46 2 29 44 22 256 -22 55 2 9 56 19 50 53 42 23 57 43 22 - 76 0 0 55 35 24 2 29 46 21 257 -22 54 56 45 56 14 29 53 36 55 57 38 5 - 75 0 0 55 29 51 2 29 47 21 257 -22 54 51 10 56 8 58 53 31 17 57 32 38 - 74 0 0 55 24 8 2 29 49 20 258 -23 54 45 26 56 3 17 53 25 29 57 27 1 - 73 0 0 55 18 15 2 29 50 20 259 -23 54 39 31 55 57 26 53 19 30 57 21 15 - 72 0 0 55 12 12 2 29 51 19 260 -24 54 33 25 55 51 25 53 13 21 57 15 18 - 71 0 0 55 5 59 2 29 52 18 261 -24 54 27 10 55 45 13 53 7 2 57 9 11 - 70 0 0 54 59 35 2 29 54 18 262 -25 54 20 45 55 38 52 53 0 33 57 2 54 - 69 0 0 54 53 2 2 29 55 17 263 -25 54 14 9 55 32 20 52 53 53 56 56 27 - 68 0 0 54 46 18 2 29 56 17 264 -26 54 7 24 55 25 39 52 47 4 56 49 50 - 67 0 0 54 39 24 2 29 57 16 265 -26 54 0 28 55 18 47 52 40 4 56 43 3 - 66 0 0 54 32 21 2 29 58 16 265 -26 53 53 23 55 11 46 52 32 54 56 36 6 - 65 0 0 54 25 7 2 29 59 15 266 -27 53 46 7 55 4 35 52 25 35 56 28 59 - 64 0 0 54 17 44 2 30 0 15 267 -27 53 38 42 54 57 13 52 18 6 56 21 42 - 63 0 0 54 10 11 2 30 1 14 268 -28 53 31 7 54 49 42 52 10 26 56 14 16 - 62 0 0 54 2 28 2 30 2 13 269 -28 53 23 22 54 42 1 52 2 37 56 6 40 - 61 0 0 53 54 35 2 30 3 13 270 -28 53 15 27 54 34 11 51 54 38 55 58 54 - 60 0 0 53 46 33 2 30 4 12 270 -29 53 7 22 54 26 11 51 46 30 55 50 58 - 59 0 0 53 38 21 2 30 5 12 271 -29 52 59 9 54 18 1 51 38 12 55 42 53 - 58 0 0 53 30 0 2 30 5 11 272 -30 52 50 45 54 9 41 51 29 44 55 34 39 - 57 0 0 53 21 29 2 30 6 10 273 -30 52 42 12 54 1 13 51 21 7 55 26 14 - 56 0 0 53 12 48 2 30 7 10 274 -30 52 33 30 53 52 34 51 12 21 55 17 41 - 55 0 0 53 3 58 2 30 8 9 275 -31 52 24 38 53 43 47 51 3 25 55 8 58 - 54 0 0 52 55 0 2 30 8 9 275 -31 52 15 37 53 34 50 50 54 20 55 0 5 - 53 0 0 52 45 51 2 30 9 8 276 -31 52 6 27 53 25 44 50 45 6 54 51 4 - 52 0 0 52 36 34 2 30 9 7 277 -32 51 57 8 53 16 28 50 35 44 54 41 53 - 51 0 0 52 27 8 2 30 10 7 278 -32 51 47 40 53 7 4 .. .. .. 54 32 33 - 50 0 0 52 17 33 2 30 10 6 279 -32 51 38 3 52 57 31 .. .. .. 54 23 4 - 49 0 0 52 7 49 2 30 11 5 279 -33 51 28 17 52 47 49 .. .. .. 54 13 27 - 48 0 0 51 57 57 2 30 11 5 280 -33 51 18 23 52 37 59 .. .. .. 54 3 40 - 47 0 0 51 47 55 2 30 12 4 281 -33 51 8 20 52 27 59 .. .. .. 53 53 45 - 46 0 0 51 37 46 2 30 12 3 282 -34 50 58 8 52 17 51 .. .. .. 53 43 41 - 45 0 0 51 27 28 2 30 12 3 283 -34 50 47 49 52 7 35 .. .. .. 53 33 29 - 44 0 0 51 17 2 2 30 12 2 283 -34 50 37 21 51 57 11 .. .. .. 53 23 9 - 43 0 0 51 6 28 2 30 12 2 284 -34 50 26 45 51 46 38 .. .. .. 53 12 40 - 42 0 0 50 55 45 2 30 12 1 285 -35 50 16 1 51 35 58 .. .. .. 53 2 3 - 41 0 0 50 44 55 2 30 13 0 286 -35 50 5 10 51 25 10 .. .. .. 52 51 18 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: UCAC2 35341084 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 32 43.3339 DE: +10 04 11.356 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .047, .047 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (663) Gerlinde approx. diameter [km]: 101 approx. diameter ["]: .046 distance from Earth [AU]: 3.03900 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 785 number of rejected observations: 71 time covered by the observations: 1908 Jun 24 - 2008 Jan 22 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.010, 105° remarks: * orbital elements for (663) Gerlinde : Mean anomaly = 297.46274289 deg Arg. of pericenter = 310.53437270 deg Long. of node = 233.02711009 deg Inclination = 17.84921616 deg Eccentricity = 0.15307156 Semimajor axis = 3.06212632 AU Perihelion dist = 2.59340186 AU Mag: H = 9.08, G = 0.15 Epoch of elements : MJD 54556.10200000 TDT (2008 Mar 31.102) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 31 663 Gerlinde 2h 27.0m UT 11.8 5 32 43.334 10 4 11.36UCAC2 35341084 0.0 14.9 101 4.2 3.039 2.609 4.75 -142.4163 10.069 144.29 4.26 2.4504 -0.08703 0.69498 13.31873 1.64150 0.00555 -0.00012 2000 296.3403592008 325.00000310.534373233.027110 17.8492160.15307156 3.0621263 2.5934019 9.2 5.00.15 RATE 1.8393710 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.048 91 2.05 0.048 0 54553.5020080331_341084 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org