IOTA/IOTA-ES occultation update for (661) Cloelia / TYC 6111-00460-1 event on 2008 Mar 30, 03:42 UT Visible from Africa, Brazil, Ecuador Summary ------- On 2008 Mar 30 UT, the 48 km diameter asteroid (661) Cloelia will occult a 10.1 mag star in the constellation Virgo for observers along a path across Africa, Brazil, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 13.8 mag (the magnitude of the asteroid) for at most 3.9 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: 66 * date and approx. time of event: 2008 Mar 30, 03:33 - 2008 Mar 30, 03:50 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 3.9 * Moon: 48 % sunlit, 83° distance * Sun: 167° distance * rough path description: Africa, Brazil, Ecuador The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.91 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .031", 109° ) * approx speed of asteroid's shadow [km/s]: 12.2729 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6111-00460-1 by 661 Cloelia on 2008 Mar 30 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 -136 0 0 17 24 57 3 50 53 0 107 -9 17 38 43 17 11 12 18 3 47 16 46 12 -135 0 0 17 7 36 3 50 53 1 107 -10 17 21 23 16 53 51 17 46 28 16 28 49 -134 0 0 16 50 5 3 50 52 2 107 -11 17 3 52 16 36 18 17 28 58 16 11 16 -133 0 0 16 32 23 3 50 52 3 108 -12 16 46 11 16 18 36 17 11 18 15 53 33 -132 0 0 16 14 32 3 50 51 4 108 -13 16 28 20 16 0 44 16 53 29 15 35 40 -131 0 0 15 56 31 3 50 51 5 108 -14 16 10 20 15 42 43 16 35 29 15 17 37 -130 0 0 15 38 21 3 50 50 6 108 -15 15 52 10 15 24 33 16 17 21 14 59 26 -129 0 0 15 20 3 3 50 49 7 109 -16 15 33 52 15 6 13 15 59 4 14 41 6 -128 0 0 15 1 36 3 50 47 8 109 -17 15 15 26 14 47 46 15 40 38 14 22 37 -127 0 0 14 43 1 3 50 46 9 109 -18 14 56 51 14 29 10 15 22 4 14 4 1 -126 0 0 14 24 18 3 50 44 10 109 -19 14 38 9 14 10 27 15 3 23 13 45 17 -125 0 0 14 5 28 3 50 43 11 110 -20 14 19 19 13 51 37 14 44 34 13 26 26 -124 0 0 13 46 31 3 50 41 12 110 -21 14 0 23 13 32 40 14 25 38 13 7 29 -123 0 0 13 27 28 3 50 39 13 110 -22 13 41 20 13 13 36 14 6 36 12 48 24 -122 0 0 13 8 19 3 50 36 14 110 -23 13 22 11 12 54 27 13 47 28 12 29 14 -121 0 0 12 49 4 3 50 34 15 111 -24 13 2 57 12 35 12 13 28 14 12 9 58 -120 0 0 12 29 44 3 50 32 16 111 -25 12 43 37 12 15 51 13 8 54 11 50 38 -119 0 0 12 10 19 3 50 29 17 111 -26 12 24 12 11 56 26 12 49 30 11 31 12 -118 0 0 11 50 49 3 50 26 18 111 -27 12 4 42 11 36 56 12 30 1 11 11 42 -117 0 0 11 31 15 3 50 23 19 112 -28 11 45 9 11 17 22 12 10 28 10 52 8 -116 0 0 11 11 38 3 50 20 20 112 -29 11 25 32 10 57 45 11 50 51 10 32 30 -115 0 0 10 51 58 3 50 16 21 112 -30 11 5 52 10 38 5 11 31 11 10 12 49 -114 0 0 10 32 15 3 50 13 22 112 -31 10 46 9 10 18 21 11 11 28 9 53 6 -113 0 0 10 12 29 3 50 9 23 112 -32 10 26 23 9 58 36 10 51 43 9 33 20 -112 0 0 9 52 42 3 50 5 25 113 -33 10 6 36 9 38 48 10 31 55 9 13 33 -111 0 0 9 32 53 3 50 1 26 113 -34 9 46 47 9 18 59 10 12 6 8 53 44 -110 0 0 9 13 3 3 49 57 27 113 -35 9 26 57 8 59 9 9 52 16 8 33 54 -109 0 0 8 53 12 3 49 53 28 113 -36 9 7 6 8 39 19 9 32 26 8 14 3 -108 0 0 8 33 21 3 49 49 29 113 -37 8 47 15 8 19 28 9 12 34 7 54 12 -107 0 0 8 13 30 3 49 44 30 114 -38 8 27 24 7 59 37 8 52 43 7 34 22 -106 0 0 7 53 40 3 49 39 31 114 -39 8 7 34 7 39 47 8 32 53 7 14 32 -105 0 0 7 33 51 3 49 35 32 114 -40 7 47 45 7 19 58 8 13 3 6 54 43 -104 0 0 7 14 3 3 49 30 33 114 -41 7 27 57 7 0 11 7 53 15 6 34 56 -103 0 0 6 54 17 3 49 24 34 114 -42 7 8 11 6 40 25 7 33 28 6 15 11 -102 0 0 6 34 34 3 49 19 35 114 -43 6 48 27 6 20 42 7 13 44 5 55 28 -101 0 0 6 14 53 3 49 14 36 115 -44 6 28 46 6 1 1 6 54 3 5 35 48 -100 0 0 5 55 15 3 49 8 37 115 -45 6 9 8 5 41 23 6 34 24 5 16 11 - 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3 32 30 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 6111-00460-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 56 44.6653 DE: -15 48 58.083 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .026 ) * V mag [mag]: 10.1 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (661) Cloelia approx. diameter [km]: 48 approx. diameter ["]: .034 distance from Earth [AU]: 1.96200 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 862 number of rejected observations: 60 time covered by the observations: 1930 May 27 - 2008 Feb 27 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.018, 120° remarks: * orbital elements for (661) Cloelia : Mean anomaly = 47.41261363 deg Arg. of pericenter = 169.77697062 deg Long. of node = 336.00912061 deg Inclination = 9.25967664 deg Eccentricity = 0.03615051 Semimajor axis = 3.01477173 AU Perihelion dist = 2.90578621 AU Mag: H = 9.62, G = 0.15 Epoch of elements : MJD 54555.15500000 TDT (2008 Mar 30.155) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 30 661 Cloelia 3h 42.3m UT 10.1 12 56 44.665-15 48 58.08TYC 6111-00460-1 10.4 13.8 48 3.9 1.962 -2.122 5.21 -49.2988 -15.817 125.54 3.89 3.7052 0.02471 0.14455 -6.82920 1.16078 -0.00056 0.00121 2000 46.4419902008 325.00000169.776971336.009121 9.2596770.03615051 3.0147717 2.9057862 9.6 5.00.15 RATE 1.8828790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.031 109 1.91 0.031 0 54553.5020080330_0460-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org