IOTA/IOTA-ES occultation update for (297) Caecilia / TYC 7382-01400-1 event on 2008 Jul 03, 10:06 UT Visible from Australia Summary ------- On 2008 Jul 03 UT, the 40 km diameter asteroid (297) Caecilia will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.6 mag (the magnitude of the asteroid) for at most 3.7 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: 59 * date and approx. time of event: 2008 Jul 03, 09:55 - 2008 Jul 03, 10:15 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 3.7 * Moon: 0 % sunlit, 163° distance * Sun: 165° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 1.05 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .031", 88° ) * approx speed of asteroid's shadow [km/s]: 10.6916 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7382-01400-1 by 297 Caecilia on 2008 Jul 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 ' " Latitude Latitude Latitude Latitude 117 0 0 - 2 52 26 10 15 28 12 123 -1 - 2 39 14 - 3 5 38 - 2 11 31 - 3 33 23 118 0 0 - 3 33 51 10 15 26 13 123 -2 - 3 20 38 - 3 47 4 - 2 52 55 - 4 14 49 119 0 0 - 4 15 17 10 15 23 15 123 -3 - 4 2 5 - 4 28 30 - 3 34 21 - 4 56 16 120 0 0 - 4 56 44 10 15 19 16 123 -4 - 4 43 31 - 5 9 57 - 4 15 47 - 5 37 43 121 0 0 - 5 38 8 10 15 16 17 123 -6 - 5 24 55 - 5 51 21 - 4 57 11 - 6 19 8 122 0 0 - 6 19 29 10 15 12 18 123 -7 - 6 6 17 - 6 32 43 - 5 38 33 - 7 0 29 123 0 0 - 7 0 46 10 15 8 19 123 -8 - 6 47 34 - 7 13 59 - 6 19 50 - 7 41 45 124 0 0 - 7 41 57 10 15 4 21 123 -9 - 7 28 45 - 7 55 10 - 7 1 2 - 8 22 56 125 0 0 - 8 23 1 10 14 59 22 123 -10 - 8 9 49 - 8 36 13 - 7 42 7 - 9 3 58 126 0 0 - 9 3 56 10 14 55 23 122 -11 - 8 50 45 - 9 17 8 - 8 23 4 - 9 44 52 127 0 0 - 9 44 42 10 14 50 24 122 -13 - 9 31 31 - 9 57 53 - 9 3 51 -10 25 35 128 0 0 -10 25 16 10 14 45 25 122 -14 -10 12 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-22 -21 22 37 -21 48 13 -20 55 45 -22 15 8 - 73 0 0 -21 0 20 9 56 11 13 239 -21 -20 47 30 -21 13 10 -20 20 33 -21 40 9 - 72 0 0 -20 24 45 9 56 8 12 239 -20 -20 11 52 -20 37 37 -19 44 51 -21 4 41 - 71 0 0 -19 48 40 9 56 6 11 238 -19 -19 35 46 -20 1 35 -19 8 40 -20 28 43 - 70 0 0 -19 12 7 9 56 4 10 238 -18 -18 59 11 -19 25 4 -18 32 1 -19 52 17 - 69 0 0 -18 35 6 9 56 2 9 238 -17 -18 22 8 -18 48 5 -17 54 53 -19 15 22 - 68 0 0 -17 57 38 9 56 0 7 237 -16 -17 44 37 -18 10 39 -17 17 19 -18 38 0 - 67 0 0 -17 19 43 9 55 59 6 237 -15 -17 6 41 -17 32 46 -16 39 19 -18 0 11 - 66 0 0 -16 41 23 9 55 58 5 237 -14 -16 28 19 -16 54 28 -16 0 53 -17 21 56 - 65 0 0 -16 2 38 9 55 57 4 236 -12 -15 49 32 -16 15 45 -15 22 3 -16 43 17 - 64 0 0 -15 23 30 9 55 56 3 236 -11 -15 10 22 -15 36 38 -14 42 49 -16 4 14 - 63 0 0 -14 43 59 9 55 55 2 236 -10 -14 30 50 -14 57 8 -14 3 13 -15 24 47 - 62 0 0 -14 4 6 9 55 55 1 236 -9 -13 50 55 -14 17 17 -13 23 16 -14 44 59 Uncertainty in time = +/- 5 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 7382-01400-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 27.7767 DE: -33 19 08.644 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .025 ) * V mag [mag]: 11.7 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (297) Caecilia approx. diameter [km]: 40 approx. diameter ["]: .030 distance from Earth [AU]: 1.85600 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 834 number of rejected observations: 95 time covered by the observations: 1900 May 02 - 2008 Jun 13 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.019, 87° remarks: * orbital elements for (297) Caecilia : Mean anomaly = 319.31864717 deg Arg. of pericenter = 354.94025208 deg Long. of node = 332.16206225 deg Inclination = 7.55088290 deg Eccentricity = 0.14587348 Semimajor axis = 3.16538931 AU Perihelion dist = 2.70364294 AU Mag: H = 9.01, G = 0.15 Epoch of elements : MJD 54650.42100000 TDT (2008 Jul 03.421) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 3 297 Caecilia 10h 5.8m UT 11.7 17 59 27.777-33 19 8.64TYC 7382-01400-1 12.5 13.6 40 3.7 1.856 -2.242 5.26 -163.3928 -33.321 29.62 22.91 10.0968 -0.01884 -0.10012 -5.93171 1.10969 0.00115 0.00094 2000 319.2449682008 7 3.00000354.940252332.162062 7.5508830.14587348 3.1653893 2.7036430 9.5 5.00.15 RATE 1.7501020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.031 88 2.05 0.031 0 54636.5020080703_1400-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org