IOTA/IOTA-ES occultation update for (1224) Fantasia / TYC 1381-00001-1 event on 2008 Oct 17, 03:49 UT Visible from Africa Summary ------- On 2008 Oct 17 UT, the 14 km diameter asteroid (1224) Fantasia will occult a 10.2 mag star in the constellation Cancer for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.6 mag (the magnitude of the asteroid) for at most 0.7 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: 23 * date and approx. time of event: 2008 Oct 17, 03:45 - 2008 Oct 17, 03:49 UT * midpoint of event [JD]: 2454756.65950417 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 0.7 * Moon: 92 % sunlit, 65° distance * Sun: 83° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 2.95 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .029", 100° ) * approx speed of asteroid's shadow [km/s]: 20.3651 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1381-00001-1 by 1224 Fantasia on 2008 Oct 17 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 - 48 0 0 - 5 22 4 3 45 4 0 72 -71 - 5 26 35 - 5 17 34 .. .. .. .. .. .. - 47 0 0 - 5 2 37 3 45 4 1 72 -71 - 5 7 7 - 4 58 7 - 5 33 46 .. .. .. - 46 0 0 - 4 43 41 3 45 5 2 72 -70 - 4 48 11 - 4 39 12 - 5 14 45 .. .. .. - 45 0 0 - 4 25 17 3 45 5 3 72 -70 - 4 29 46 - 4 20 49 - 4 56 16 .. .. .. - 44 0 0 - 4 7 25 3 45 5 4 71 -69 - 4 11 53 - 4 2 57 - 4 38 20 - 3 36 39 - 43 0 0 - 3 50 5 3 45 6 5 71 -69 - 3 54 33 - 3 45 38 - 4 20 56 - 3 19 24 - 42 0 0 - 3 33 18 3 45 7 6 71 -68 - 3 37 45 - 3 28 51 - 4 4 4 - 3 2 40 - 41 0 0 - 3 17 3 3 45 7 7 71 -67 - 3 21 29 - 3 12 36 - 3 47 45 - 2 46 29 - 40 0 0 - 3 1 21 3 45 8 8 71 -67 - 3 5 46 - 2 56 55 - 3 31 59 - 2 30 51 - 39 0 0 - 2 46 11 3 45 9 9 71 -66 - 2 50 37 - 2 41 46 - 3 16 46 - 2 15 46 - 38 0 0 - 2 31 35 3 45 10 10 71 -65 - 2 36 0 - 2 27 11 - 3 2 6 - 2 1 13 - 37 0 0 - 2 17 32 3 45 12 12 71 -64 - 2 21 57 - 2 13 8 - 2 47 59 - 1 47 14 - 36 0 0 - 2 4 3 3 45 13 13 71 -64 - 2 8 27 - 1 59 39 - 2 34 27 - 1 33 48 - 35 0 0 - 1 51 7 3 45 14 14 71 -63 - 1 55 30 - 1 46 44 - 2 21 27 - 1 20 55 - 34 0 0 - 1 38 45 3 45 16 15 71 -62 - 1 43 8 - 1 34 22 - 2 9 2 - 1 8 36 - 33 0 0 - 1 26 57 3 45 18 16 71 -61 - 1 31 19 - 1 22 34 - 1 57 11 - 0 56 51 - 32 0 0 - 1 15 42 3 45 19 17 71 -60 - 1 20 4 - 1 11 20 - 1 45 53 - 0 45 40 - 31 0 0 - 1 5 2 3 45 21 18 71 -59 - 1 9 23 - 1 0 40 - 1 35 10 - 0 35 2 - 30 0 0 - 0 54 56 3 45 23 19 71 -58 - 0 59 17 - 0 50 35 - 1 25 1 - 0 24 58 - 29 0 0 - 0 45 24 3 45 25 20 70 -57 - 0 49 44 - 0 41 3 - 1 15 27 - 0 15 29 - 28 0 0 - 0 36 26 3 45 27 21 70 -57 - 0 40 46 - 0 32 5 - 1 6 27 - 0 6 33 - 27 0 0 - 0 28 2 3 45 30 22 70 -56 - 0 32 23 - 0 23 42 - 0 58 1 0 1 48 - 26 0 0 - 0 20 14 3 45 32 23 70 -55 - 0 24 33 - 0 15 54 - 0 50 10 0 9 35 - 25 0 0 - 0 12 59 3 45 34 24 70 -54 - 0 17 19 - 0 8 40 - 0 42 54 0 16 48 - 24 0 0 - 0 6 19 3 45 37 25 70 -53 - 0 10 39 - 0 2 0 - 0 36 13 0 23 26 - 23 0 0 - 0 0 14 3 45 40 26 70 -52 - 0 4 33 0 4 5 - 0 30 6 0 29 29 - 22 0 0 0 5 16 3 45 42 27 70 -51 0 0 57 0 9 35 - 0 24 34 0 34 58 - 21 0 0 0 10 12 3 45 45 28 70 -50 0 5 53 0 14 30 - 0 19 37 0 39 53 - 20 0 0 0 14 33 3 45 48 29 69 -49 0 10 14 0 18 51 - 0 15 15 0 44 12 - 19 0 0 0 18 19 3 45 51 29 69 -48 0 14 0 0 22 37 - 0 11 29 0 47 57 - 18 0 0 0 21 29 3 45 54 30 69 -47 0 17 11 0 25 48 - 0 8 17 0 51 8 - 17 0 0 0 24 5 3 45 58 31 69 -46 0 19 47 0 28 24 - 0 5 40 0 53 43 - 16 0 0 0 26 6 3 46 1 32 69 -45 0 21 48 0 30 24 - 0 3 39 0 55 44 - 15 0 0 0 27 32 3 46 4 33 68 -44 0 23 14 0 31 50 - 0 2 13 0 57 9 - 14 0 0 0 28 23 3 46 8 34 68 -43 0 24 5 0 32 41 - 0 1 22 0 58 0 - 13 0 0 0 28 39 3 46 11 35 68 -42 0 24 20 0 32 57 - 0 1 6 0 58 16 - 12 0 0 0 28 19 3 46 15 36 68 -41 0 24 1 0 32 37 - 0 1 26 0 57 56 - 11 0 0 0 27 24 3 46 19 37 67 -40 0 23 6 0 31 42 - 0 2 21 0 57 2 - 10 0 0 0 25 54 3 46 23 38 67 -39 0 21 36 0 30 12 - 0 3 52 0 55 32 - 9 0 0 0 23 49 3 46 27 39 67 -38 0 19 30 0 28 7 - 0 5 58 0 53 28 - 8 0 0 0 21 8 3 46 31 40 66 -37 0 16 49 0 25 27 - 0 8 40 0 50 48 - 7 0 0 0 17 52 3 46 35 41 66 -36 0 13 33 0 22 11 - 0 11 57 0 47 33 - 6 0 0 0 14 1 3 46 39 42 66 -35 0 9 42 0 18 19 - 0 15 50 0 43 42 - 5 0 0 0 9 34 3 46 43 43 65 -34 0 5 15 0 13 53 - 0 20 18 0 39 17 - 4 0 0 0 4 31 3 46 47 43 65 -33 0 0 12 0 8 51 - 0 25 22 0 34 16 - 3 0 0 - 0 1 6 3 46 52 44 64 -32 - 0 5 26 0 3 13 - 0 31 1 0 28 40 - 2 0 0 - 0 7 19 3 46 56 45 64 -31 - 0 11 39 - 0 3 0 - 0 37 16 0 22 29 - 1 0 0 - 0 14 8 3 47 1 46 63 -30 - 0 18 28 - 0 9 48 - 0 44 7 0 15 42 0 0 0 - 0 21 32 3 47 5 47 63 -29 - 0 25 53 - 0 17 12 - 0 51 33 0 8 20 1 0 0 - 0 29 32 3 47 10 48 62 -28 - 0 33 53 - 0 25 11 - 0 59 35 0 0 23 2 0 0 - 0 38 7 3 47 15 49 61 -27 - 0 42 28 - 0 33 46 - 1 8 13 - 0 8 10 3 0 0 - 0 47 18 3 47 20 49 60 -26 - 0 51 39 - 0 42 56 - 1 17 26 - 0 17 17 4 0 0 - 0 57 4 3 47 25 50 60 -25 - 1 1 26 - 0 52 42 - 1 27 15 - 0 27 1 5 0 0 - 1 7 25 3 47 29 51 59 -24 - 1 11 48 - 1 3 3 - 1 37 40 - 0 37 19 6 0 0 - 1 18 22 3 47 34 52 58 -23 - 1 22 45 - 1 13 59 - 1 48 40 - 0 48 13 7 0 0 - 1 29 54 3 47 40 53 57 -22 - 1 34 18 - 1 25 31 - 2 0 15 - 0 59 42 8 0 0 - 1 42 2 3 47 45 53 56 -21 - 1 46 26 - 1 37 38 - 2 12 27 - 1 11 46 9 0 0 - 1 54 45 3 47 50 54 55 -20 - 1 59 9 - 1 50 21 - 2 25 13 - 1 24 26 10 0 0 - 2 8 3 3 47 55 55 54 -19 - 2 12 28 - 2 3 39 - 2 38 35 - 1 37 40 11 0 0 - 2 21 57 3 48 0 55 53 -18 - 2 26 22 - 2 17 31 - 2 52 33 - 1 51 30 12 0 0 - 2 36 25 3 48 6 56 51 -17 - 2 40 51 - 2 31 59 - 3 7 5 - 2 5 54 13 0 0 - 2 51 29 3 48 11 57 50 -16 - 2 55 56 - 2 47 2 - 3 22 13 - 2 20 54 14 0 0 - 3 7 7 3 48 17 57 49 -15 - 3 11 35 - 3 2 40 - 3 37 56 - 2 36 28 15 0 0 - 3 23 21 3 48 22 58 47 -13 - 3 27 49 - 3 18 53 - 3 54 14 - 2 52 37 16 0 0 - 3 40 9 3 48 28 58 46 -12 - 3 44 37 - 3 35 40 - 4 11 6 - 3 9 21 17 0 0 - 3 57 31 3 48 33 59 44 -11 - 4 2 1 - 3 53 2 - 4 28 34 - 3 26 38 18 0 0 - 4 15 28 3 48 39 59 43 -10 - 4 19 58 - 4 10 59 - 4 46 36 - 3 44 31 19 0 0 - 4 34 0 3 48 45 60 41 -9 - 4 38 30 - 4 29 29 - 5 5 12 - 4 2 57 20 0 0 - 4 53 5 3 48 50 60 39 -8 - 4 57 36 - 4 48 34 - 5 24 22 - 4 21 57 21 0 0 - 5 12 44 3 48 56 61 37 -7 - 5 17 16 - 5 8 12 - 5 44 6 - 4 41 31 22 0 0 - 5 32 56 3 49 2 61 35 -6 - 5 37 29 - 5 28 24 - 6 4 24 - 5 1 38 23 0 0 - 5 53 42 3 49 8 61 33 -5 - 5 58 16 - 5 49 9 - 6 25 16 - 5 22 19 24 0 0 - 6 15 1 3 49 14 61 31 -4 - 6 19 36 - 6 10 27 - 6 46 40 - 5 43 33 25 0 0 - 6 36 53 3 49 20 62 29 -3 - 6 41 29 - 6 32 18 - 7 8 38 - 6 5 19 26 0 0 - 6 59 18 3 49 26 62 27 -2 - 7 3 54 - 6 54 42 - 7 31 8 - 6 27 38 27 0 0 - 7 22 14 3 49 31 62 25 -1 - 7 26 51 - 7 17 37 - 7 54 10 - 6 50 28 Uncertainty in time = +/- 2 secs [Prediction of 2008 Sep 5.0] Data for the target star ------------------------ * name: TYC 1381-00001-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 09 12.6353 DE: +18 08 00.288 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .025 ) * V mag [mag]: 10.2 * B mag [mag]: 11.4 * Apparent position with proper motion RA(deg): 122.4316607391 DE(deg): 18.1084886732 * Equation of equinoxes (radians) : 0.000047012166862 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1224) Fantasia approx. diameter [km]: 14 approx. diameter ["]: .010 distance from Earth [AU]: 1.89500 * orbital information: orbit source: Preston date of fit: 2008 Sep 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 651 number of rejected observations: 56 time covered by the observations: 1934 Oct 05 - 2007 Aug 28 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.016, 113° remarks: * orbital elements for (1224) Fantasia : Mean anomaly = 45.13760055 deg Arg. of pericenter = 129.08854952 deg Long. of node = 258.26128721 deg Inclination = 7.87832064 deg Eccentricity = 0.19817652 Semimajor axis = 2.30447465 AU Perihelion dist = 1.84778189 AU Mag: H = 11.33, G = 0.15 Epoch of elements : MJD 54756.15900000 TDT (2008 Oct 17.159) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 17 1224 Fantasia 3h 49.7m UT 10.2 8 9 12.635 18 8 0.29TYC 1381-00001-1 11.4 15.6 14 0.7 1.895 3.460 -20.29 38.8534 18.138 118.91 -9.37 3.8281 -0.17789 -0.43443 10.63086 -4.37162 -0.00517 0.00110 2000 43.40237420081011.00000129.088550258.261287 7.8783210.19817652 2.3044747 1.847781911.4 5.00.15 RATE 2.8173850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.029 100 3.95 0.030 0 54714.5020081017_0001-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 20:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org