IOTA/IOTA-ES occultation update for (76) Freia / TYC 1325-01001-1 event on 2008 Mar 24, 18:01 UT Visible from Africa, Madagascar Summary ------- On 2008 Mar 24 UT, the 184 km diameter asteroid (76) Freia will occult a 11.9 mag star in the constellation Orion for observers along a path across Africa, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.4 mag (the magnitude of the asteroid) for at most 9.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 Mar 24, 18:01 - 2008 Mar 24, 18:05 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 9.7 * Moon: 91 % sunlit, 127° distance * Sun: 87° distance * rough path description: Africa, Madagascar The occultation path -------------------- * approximate projected width [km]: 238 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .019", 91° ) * approx speed of asteroid's shadow [km/s]: 18.9556 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1325-01001-1 by 76 Freia on 2008 Mar 24 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 1 0 0 -18 19 32 18 1 37 50 357 0 -19 24 47 -17 15 16 -19 52 30 -16 48 34 2 0 0 -18 18 14 18 1 43 50 355 -1 -19 23 29 -17 14 0 -19 51 12 -16 47 18 3 0 0 -18 17 26 18 1 48 50 354 -2 -19 22 40 -17 13 12 -19 50 23 -16 46 31 4 0 0 -18 17 8 18 1 54 50 352 -3 -19 22 22 -17 12 54 -19 50 5 -16 46 13 5 0 0 -18 17 20 18 2 0 50 351 -4 -19 22 34 -17 13 6 -19 50 16 -16 46 24 6 0 0 -18 18 1 18 2 5 50 349 -5 -19 23 15 -17 13 47 -19 50 58 -16 47 5 7 0 0 -18 19 12 18 2 11 50 348 -6 -19 24 27 -17 14 57 -19 52 10 -16 48 15 8 0 0 -18 20 52 18 2 17 49 346 -7 -19 26 8 -17 16 37 -19 53 51 -16 49 54 9 0 0 -18 23 2 18 2 22 49 345 -8 -19 28 19 -17 18 46 -19 56 3 -16 52 3 10 0 0 -18 25 42 18 2 28 49 344 -9 -19 31 0 -17 21 24 -19 58 45 -16 54 40 11 0 0 -18 28 51 18 2 33 49 342 -10 -19 34 11 -17 24 31 -20 1 56 -16 57 47 12 0 0 -18 32 29 18 2 39 48 341 -11 -19 37 51 -17 28 8 -20 5 37 -17 1 23 13 0 0 -18 36 37 18 2 45 48 340 -12 -19 42 1 -17 32 14 -20 9 49 -17 5 28 14 0 0 -18 41 14 18 2 50 47 338 -13 -19 46 41 -17 36 48 -20 14 29 -17 10 2 15 0 0 -18 46 21 18 2 55 47 337 -14 -19 51 50 -17 41 52 -20 19 39 -17 15 4 16 0 0 -18 51 56 18 3 1 46 336 -15 -19 57 28 -17 47 24 -20 25 19 -17 20 36 17 0 0 -18 58 0 18 3 6 46 335 -16 -20 3 36 -17 53 26 -20 31 28 -17 26 36 18 0 0 -19 4 34 18 3 11 45 333 -17 -20 10 13 -17 59 56 -20 38 6 -17 33 4 19 0 0 -19 11 36 18 3 17 45 332 -18 -20 17 19 -18 6 54 -20 45 14 -17 40 1 20 0 0 -19 19 6 18 3 22 44 331 -19 -20 24 53 -18 14 21 -20 52 50 -17 47 26 21 0 0 -19 27 5 18 3 27 44 330 -20 -20 32 57 -18 22 16 -21 0 55 -17 55 20 22 0 0 -19 35 33 18 3 32 43 329 -21 -20 41 28 -18 30 39 -21 9 29 -18 3 41 23 0 0 -19 44 28 18 3 37 43 328 -22 -20 50 29 -18 39 30 -21 18 32 -18 12 30 24 0 0 -19 53 52 18 3 42 42 327 -23 -20 59 57 -18 48 49 -21 28 2 -18 21 47 25 0 0 -20 3 43 18 3 47 41 326 -24 -21 9 54 -18 58 35 -21 38 1 -18 31 31 26 0 0 -20 14 2 18 3 52 41 325 -24 -21 20 18 -19 8 49 -21 48 28 -18 41 43 27 0 0 -20 24 48 18 3 57 40 324 -25 -21 31 10 -19 19 30 -21 59 22 -18 52 22 28 0 0 -20 36 2 18 4 1 39 323 -26 -21 42 29 -19 30 37 -22 10 44 -19 3 27 29 0 0 -20 47 42 18 4 6 38 322 -27 -21 54 16 -19 42 12 -22 22 33 -19 14 59 30 0 0 -20 59 49 18 4 11 38 322 -28 -22 6 29 -19 54 13 -22 34 49 -19 26 58 31 0 0 -21 12 22 18 4 15 37 321 -29 -22 19 9 -20 6 40 -22 47 32 -19 39 23 32 0 0 -21 25 22 18 4 19 36 320 -30 -22 32 15 -20 19 33 -23 0 41 -19 52 13 33 0 0 -21 38 47 18 4 24 35 319 -31 -22 45 47 -20 32 52 -23 14 16 -20 5 29 34 0 0 -21 52 38 18 4 28 35 318 -32 -22 59 45 -20 46 37 -23 28 17 -20 19 11 35 0 0 -22 6 55 18 4 32 34 318 -33 -23 14 9 -21 0 46 -23 42 44 -20 33 18 36 0 0 -22 21 36 18 4 36 33 317 -33 -23 28 58 -21 15 20 -23 57 36 -20 47 49 37 0 0 -22 36 42 18 4 40 32 316 -34 -23 44 11 -21 30 19 -24 12 53 -21 2 45 38 0 0 -22 52 12 18 4 44 31 315 -35 -23 59 49 -21 45 42 -24 28 34 -21 18 5 39 0 0 -23 8 6 18 4 48 30 315 -36 -24 15 51 -22 1 28 -24 44 39 -21 33 48 40 0 0 -23 24 24 18 4 52 30 314 -37 -24 32 16 -22 17 38 -25 1 8 -21 49 55 41 0 0 -23 41 4 18 4 55 29 313 -38 -24 49 5 -22 34 11 -25 18 0 -22 6 25 42 0 0 -23 58 8 18 4 59 28 313 -38 -25 6 17 -22 51 7 -25 35 16 -22 23 18 43 0 0 -24 15 34 18 5 2 27 312 -39 -25 23 51 -23 8 25 -25 52 53 -22 40 32 44 0 0 -24 33 21 18 5 5 26 312 -40 -25 41 47 -23 26 5 -26 10 53 -22 58 9 45 0 0 -24 51 31 18 5 9 25 311 -41 -26 0 5 -23 44 6 -26 29 15 -23 16 7 46 0 0 -25 10 1 18 5 12 24 310 -41 -26 18 44 -24 2 28 -26 47 57 -23 34 25 47 0 0 -25 28 52 18 5 15 23 310 -42 -26 37 43 -24 21 10 -27 7 0 -23 53 5 48 0 0 -25 48 2 18 5 17 22 309 -43 -26 57 2 -24 40 13 -27 26 24 -24 12 4 49 0 0 -26 7 33 18 5 20 22 309 -44 -27 16 42 -24 59 35 -27 46 7 -24 31 22 50 0 0 -26 27 22 18 5 23 21 308 -44 -27 36 40 -25 19 16 -28 6 9 -24 51 0 51 0 0 -26 47 30 18 5 25 20 308 -45 -27 56 56 -25 39 16 -28 26 29 -25 10 56 52 0 0 -27 7 56 18 5 28 19 307 -46 -28 17 31 -25 59 33 -28 47 8 -25 31 10 53 0 0 -27 28 39 18 5 30 18 306 -46 -28 38 23 -26 20 8 -29 8 4 -25 51 42 54 0 0 -27 49 39 18 5 32 17 306 -47 -28 59 32 -26 41 0 -29 29 17 -26 12 30 55 0 0 -28 10 56 18 5 34 16 305 -47 -29 20 58 -27 2 8 -29 50 46 -26 33 35 56 0 0 -28 32 28 18 5 36 15 305 -48 -29 42 39 -27 23 32 -30 12 31 -26 54 55 57 0 0 -28 54 15 18 5 38 14 304 -48 -30 4 35 -27 45 11 -30 34 31 -27 16 31 58 0 0 -29 16 17 18 5 40 13 304 -49 -30 26 45 -28 7 4 -30 56 45 -27 38 21 59 0 0 -29 38 33 18 5 41 12 303 -49 -30 49 10 -28 29 12 -31 19 13 -28 0 25 60 0 0 -30 1 2 18 5 43 11 303 -50 -31 11 47 -28 51 32 -31 41 54 -28 22 43 61 0 0 -30 23 43 18 5 44 10 302 -50 -31 34 37 -29 14 6 -32 4 48 -28 45 13 62 0 0 -30 46 36 18 5 45 9 302 -51 -31 57 39 -29 36 51 -32 27 53 -29 7 55 63 0 0 -31 9 41 18 5 46 8 301 -51 -32 20 52 -29 59 48 -32 51 10 -29 30 49 64 0 0 -31 32 56 18 5 47 8 301 -51 -32 44 15 -30 22 56 -33 14 37 -29 53 53 65 0 0 -31 56 22 18 5 48 7 300 -52 -33 7 48 -30 46 14 -33 38 14 -30 17 8 66 0 0 -32 19 56 18 5 49 6 299 -52 -33 31 31 -31 9 41 -34 1 59 -30 40 32 67 0 0 -32 43 39 18 5 50 5 299 -52 -33 55 21 -31 33 16 -34 25 54 -31 4 5 68 0 0 -33 7 30 18 5 50 4 298 -53 -34 19 20 -31 57 0 -34 49 55 -31 27 46 69 0 0 -33 31 28 18 5 51 3 298 -53 -34 43 25 -32 20 51 -35 14 4 -31 51 34 70 0 0 -33 55 33 18 5 51 2 297 -53 -35 7 37 -32 44 49 -35 38 19 -32 15 30 71 0 0 -34 19 43 18 5 51 1 297 -53 -35 31 54 -33 8 53 -36 2 39 -32 39 31 72 0 0 -34 43 58 18 5 51 0 296 -53 .. .. .. -33 33 2 .. .. .. -33 3 37 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 12.0] Data for the target star ------------------------ * name: TYC 1325-01001-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 06 31.3811 DE: +21 13 05.342 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia approx. diameter [km]: 184 approx. diameter ["]: .093 distance from Earth [AU]: 2.74200 * orbital information: orbit source: Preston date of fit: 2008 Mar 12 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1099 number of rejected observations: 179 time covered by the observations: 1911 Jul 21 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 92° remarks: * orbital elements for (76) Freia : Mean anomaly = 9.49280900 deg Arg. of pericenter = 253.96902952 deg Long. of node = 204.52703747 deg Inclination = 2.11592909 deg Eccentricity = 0.16312526 Semimajor axis = 3.41839806 AU Perihelion dist = 2.86077099 AU Mag: H = 7.86, G = 0.15 Epoch of elements : MJD 54549.75100000 TDT (2008 Mar 24.751) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 24 76 Freia 18h 1.5m UT 11.9 6 6 31.381 21 13 5.34TYC 1325-01001-1 12.2 13.4 184 9.7 2.742 2.453 1.17 -1.3329 21.217 -88.85 1.78 18.0255 0.02153 -0.63519 10.69278 0.36676 0.00577 -0.00007 2000 7.9721942008 315.00000253.969030204.527037 2.1159290.16312526 3.4183981 2.8607710 7.9 5.00.15 RATE 1.5594450 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.019 91 1.21 0.019 0 54537.5020080324_1001-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 12, 23:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org