IOTA/IOTA-ES occultation update for (345) Tercidina / 2UCAC 24639578 event on 2008 Mar 01, 09:21 UT Visible from Bolivia, Chile Summary ------- On 2008 Mar 01 UT, the 108 km diameter asteroid (345) Tercidina will occult a 12.3 mag star in the constellation Ophiuchus for observers along a path across Bolivia, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.8 mag (the magnitude of the asteroid) for at most 4.5 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: 34 * date and approx. time of event: 2008 Mar 01, 09:16 - 2008 Mar 01, 09:20 UT * magnitude of target star: 12.3 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 4.5 * Moon: 38 % sunlit, 9° distance * Sun: 78° distance * rough path description: Bolivia, Chile The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 1.96 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .118 +/- .118) * 1 sigma uncertainty ellipse (major, minor, PA): ( .118", .118", 90° ) * approx speed of asteroid's shadow [km/s]: 23.8138 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 24639578 by 345 Tercidina on 2008 Mar 1 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 -128 0 0 - 9 7 44 9 16 41 1 109 -72 - 9 38 44 - 8 36 45 -11 40 20 - 6 35 20 -127 0 0 - 9 28 8 9 16 41 2 109 -71 - 9 59 5 - 8 57 10 -12 0 36 - 6 55 50 -126 0 0 - 9 48 20 9 16 41 3 109 -70 -10 19 17 - 9 17 24 -12 20 41 - 7 16 11 -125 0 0 -10 8 22 9 16 42 4 108 -69 -10 39 17 - 9 37 28 -12 40 35 - 7 36 20 -124 0 0 -10 28 12 9 16 42 5 108 -69 -10 59 6 - 9 57 20 -13 0 17 - 7 56 19 -123 0 0 -10 47 51 9 16 42 6 108 -68 -11 18 42 -10 17 0 -13 19 47 - 8 16 5 -122 0 0 -11 7 17 9 16 43 7 108 -67 -11 38 7 -10 36 28 -13 39 5 - 8 35 40 -121 0 0 -11 26 31 9 16 44 8 108 -66 -11 57 19 -10 55 44 -13 58 10 - 8 55 3 -120 0 0 -11 45 32 9 16 44 9 107 -65 -12 16 19 -11 14 47 -14 17 2 - 9 14 13 -119 0 0 -12 4 20 9 16 45 10 107 -64 -12 35 4 -11 33 36 -14 35 41 - 9 33 10 -118 0 0 -12 22 54 9 16 46 11 107 -63 -12 53 37 -11 52 12 -14 54 6 - 9 51 54 -117 0 0 -12 41 15 9 16 47 12 107 -62 -13 11 55 -12 10 35 -15 12 16 -10 10 23 -116 0 0 -12 59 21 9 16 48 13 107 -62 -13 29 59 -12 28 43 -15 30 13 -10 28 39 -115 0 0 -13 17 12 9 16 49 14 106 -61 -13 47 48 -12 46 36 -15 47 54 -10 46 40 -114 0 0 -13 34 48 9 16 50 15 106 -60 -14 5 23 -13 4 14 -16 5 20 -11 4 26 -113 0 0 -13 52 10 9 16 52 16 106 -59 -14 22 42 -13 21 38 -16 22 32 -11 21 58 -112 0 0 -14 9 15 9 16 53 17 106 -58 -14 39 46 -13 38 45 -16 39 27 -11 39 13 -111 0 0 -14 26 5 9 16 55 18 105 -57 -14 56 34 -13 55 37 -16 56 7 -11 56 13 -110 0 0 -14 42 39 9 16 56 19 105 -56 -15 13 5 -14 12 13 -17 12 30 -12 12 58 -109 0 0 -14 58 57 9 16 58 20 105 -55 -15 29 21 -14 28 33 -17 28 38 -12 29 25 -108 0 0 -15 14 58 9 16 59 21 105 -54 -15 45 20 -14 44 36 -17 44 28 -12 45 37 -107 0 0 -15 30 42 9 17 1 22 104 -53 -16 1 2 -15 0 23 -18 0 2 -13 1 31 -106 0 0 -15 46 9 9 17 3 23 104 -52 -16 16 27 -15 15 52 -18 15 19 -13 17 9 -105 0 0 -16 1 19 9 17 5 24 104 -51 -16 31 35 -15 31 4 -18 30 18 -13 32 29 -104 0 0 -16 16 11 9 17 7 25 104 -50 -16 46 25 -15 45 58 -18 45 0 -13 47 32 -103 0 0 -16 30 46 9 17 9 26 103 -49 -17 0 58 -16 0 35 -18 59 24 -14 2 17 -102 0 0 -16 45 3 9 17 11 27 103 -48 -17 15 12 -16 14 54 -19 13 31 -14 16 44 -101 0 0 -16 59 2 9 17 13 28 103 -48 -17 29 9 -16 28 55 -19 27 19 -14 30 53 -100 0 0 -17 12 42 9 17 15 29 102 -47 -17 42 47 -16 42 37 -19 40 49 -14 44 43 - 99 0 0 -17 26 4 9 17 18 30 102 -46 -17 56 7 -16 56 1 -19 54 1 -14 58 15 - 98 0 0 -17 39 7 9 17 20 31 102 -45 -18 9 8 -17 9 7 -20 6 54 -15 11 29 - 97 0 0 -17 51 52 9 17 23 32 101 -44 -18 21 51 -17 21 53 -20 19 29 -15 24 23 - 96 0 0 -18 4 17 9 17 25 33 101 -43 -18 34 14 -17 34 21 -20 31 44 -15 36 59 - 95 0 0 -18 16 24 9 17 28 34 101 -42 -18 46 19 -17 46 29 -20 43 41 -15 49 15 - 94 0 0 -18 28 11 9 17 30 35 100 -41 -18 58 4 -17 58 19 -20 55 19 -16 1 12 - 93 0 0 -18 39 39 9 17 33 36 100 -40 -19 9 31 -18 9 49 -21 6 38 -16 12 49 - 92 0 0 -18 50 48 9 17 36 37 100 -39 -19 20 37 -18 20 59 -21 17 37 -16 24 7 - 91 0 0 -19 1 37 9 17 38 38 99 -38 -19 31 24 -18 31 50 -21 28 17 -16 35 5 - 90 0 0 -19 12 6 9 17 41 39 99 -37 -19 41 52 -18 42 21 -21 38 37 -16 45 43 - 89 0 0 -19 22 16 9 17 44 40 99 -36 -19 51 59 -18 52 32 -21 48 38 -16 56 1 - 88 0 0 -19 32 5 9 17 47 41 98 -35 -20 1 47 -19 2 23 -21 58 19 -17 5 59 - 87 0 0 -19 41 35 9 17 50 42 98 -34 -20 11 15 -19 11 55 -22 7 40 -17 15 37 - 86 0 0 -19 50 44 9 17 53 43 98 -33 -20 20 23 -19 21 6 -22 16 41 -17 24 55 - 85 0 0 -19 59 33 9 17 56 44 97 -33 -20 29 11 -19 29 56 -22 25 22 -17 33 52 - 84 0 0 -20 8 2 9 17 59 45 97 -32 -20 37 38 -19 38 27 -22 33 44 -17 42 28 - 83 0 0 -20 16 11 9 18 3 46 97 -31 -20 45 45 -19 46 37 -22 41 45 -17 50 44 - 82 0 0 -20 23 59 9 18 6 47 96 -30 -20 53 32 -19 54 27 -22 49 26 -17 58 40 - 81 0 0 -20 31 27 9 18 9 48 96 -29 -21 0 58 -20 1 56 -22 56 47 -18 6 14 - 80 0 0 -20 38 34 9 18 13 49 95 -28 -21 8 4 -20 9 5 -23 3 48 -18 13 28 - 79 0 0 -20 45 21 9 18 16 50 95 -27 -21 14 50 -20 15 53 -23 10 28 -18 20 21 - 78 0 0 -20 51 47 9 18 19 51 95 -26 -21 21 15 -20 22 20 -23 16 48 -18 26 53 - 77 0 0 -20 57 53 9 18 23 52 94 -25 -21 27 19 -20 28 27 -23 22 48 -18 33 4 - 76 0 0 -21 3 37 9 18 26 53 94 -24 -21 33 2 -20 34 12 -23 28 27 -18 38 54 - 75 0 0 -21 9 1 9 18 30 54 94 -23 -21 38 25 -20 39 37 -23 33 45 -18 44 23 - 74 0 0 -21 14 4 9 18 34 55 93 -22 -21 43 27 -20 44 41 -23 38 44 -18 49 31 - 73 0 0 -21 18 46 9 18 37 55 93 -21 -21 48 8 -20 49 24 -23 43 21 -18 54 18 - 72 0 0 -21 23 7 9 18 41 56 92 -20 -21 52 29 -20 53 46 -23 47 38 -18 58 43 - 71 0 0 -21 27 8 9 18 45 57 92 -20 -21 56 28 -20 57 47 -23 51 35 -19 2 47 - 70 0 0 -21 30 47 9 18 48 58 91 -19 -22 0 7 -21 1 27 -23 55 10 -19 6 30 - 69 0 0 -21 34 5 9 18 52 59 91 -18 -22 3 24 -21 4 46 -23 58 25 -19 9 52 - 68 0 0 -21 37 2 9 18 56 60 91 -17 -22 6 21 -21 7 44 -24 1 20 -19 12 52 - 67 0 0 -21 39 39 9 19 0 61 90 -16 -22 8 57 -21 10 21 -24 3 53 -19 15 30 - 66 0 0 -21 41 54 9 19 4 62 90 -15 -22 11 11 -21 12 36 -24 6 6 -19 17 48 - 65 0 0 -21 43 48 9 19 8 63 89 -14 -22 13 5 -21 14 31 -24 7 58 -19 19 44 - 64 0 0 -21 45 21 9 19 12 64 89 -13 -22 14 38 -21 16 4 -24 9 30 -19 21 18 - 63 0 0 -21 46 33 9 19 16 65 88 -12 -22 15 49 -21 17 16 -24 10 40 -19 22 31 - 62 0 0 -21 47 23 9 19 20 66 88 -11 -22 16 40 -21 18 7 -24 11 30 -19 23 23 - 61 0 0 -21 47 53 9 19 24 67 87 -10 -22 17 9 -21 18 37 -24 11 59 -19 23 53 - 60 0 0 -21 48 1 9 19 28 68 87 -9 -22 17 18 -21 18 45 -24 12 8 -19 24 1 - 59 0 0 -21 47 49 9 19 32 69 86 -8 -22 17 5 -21 18 32 -24 11 55 -19 23 48 - 58 0 0 -21 47 15 9 19 36 70 86 -8 -22 16 31 -21 17 58 -24 11 22 -19 23 14 - 57 0 0 -21 46 19 9 19 40 71 85 -7 -22 15 36 -21 17 3 -24 10 27 -19 22 18 - 56 0 0 -21 45 3 9 19 44 72 85 -6 -22 14 20 -21 15 46 -24 9 12 -19 21 0 - 55 0 0 -21 43 26 9 19 49 72 84 -5 -22 12 43 -21 14 9 -24 7 36 -19 19 21 - 54 0 0 -21 41 27 9 19 53 73 84 -4 -22 10 45 -21 12 10 -24 5 40 -19 17 21 - 53 0 0 -21 39 7 9 19 57 74 83 -3 -22 8 25 -21 9 49 -24 3 22 -19 14 58 - 52 0 0 -21 36 26 9 20 1 75 82 -2 -22 5 45 -21 7 8 -24 0 44 -19 12 15 - 51 0 0 -21 33 24 9 20 6 76 82 -1 -22 2 43 -21 4 5 -23 57 45 -19 9 10 - 50 0 0 -21 30 1 9 20 10 77 81 0 -21 59 21 -21 0 41 -23 54 25 -19 5 43 Uncertainty in time = +/- 9 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: 2UCAC 24639578 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 31 05.3884 DE: -18 48 54.887 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .117, .117 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (345) Tercidina approx. diameter [km]: 108 approx. diameter ["]: .060 distance from Earth [AU]: 2.46300 * orbital information: orbit source: Preston date of fit: 2007 Nov 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 740 number of rejected observations: 140 time covered by the observations: 1901 Mar 27 - 2007 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.009, 85° remarks: * orbital elements for (345) Tercidina : Mean anomaly = 154.90818582 deg Arg. of pericenter = 229.69591276 deg Long. of node = 212.78793454 deg Inclination = 9.75009163 deg Eccentricity = 0.06096686 Semimajor axis = 2.32549062 AU Perihelion dist = 2.18371276 AU Mag: H = 8.67, G = 0.10 Epoch of elements : MJD 54526.39000000 TDT (2008 Mar 01.390) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 1 345 Tercidina 9h 21.1m UT 12.3 17 31 5.388-18 48 54.892UCAC 24639578 0.0 13.8 108 4.5 2.463 3.347 6.70 -37.0693 -18.817 42.79 -7.37 9.3525 0.00435 -0.02168 13.30979 1.87454 -0.00559 0.00038 2000 153.1322272008 224.00000229.695913212.787935 9.7500920.06096686 2.3254906 2.1837128 8.7 5.00.10 RATE 2.7792790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.118 0.118 90 2.96 0.119 0 54510.5020080301_639578 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 02:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org