IOTA/IOTA-ES occultation update for (524) Fidelio / 2UCAC 26681444 event on 2007 Sep 01, 17:47 UT Visible from Africa Summary ------- On 2007 Sep 01 UT, the 72 km diameter asteroid (524) Fidelio will occult a 11.3 mag star in the constellation Virgo 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 4.5 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.9 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: 58 * date and approx. time of event: 2007 Sep 01, 17:44 - 2007 Sep 01, 17:50 UT * midpoint of event [JD]: 2454345.24112083 * magnitude of target star: 11.3 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 1.9 * Moon: 76 % sunlit, 165° distance * Sun: 43° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 72 * 1 sigma uncertainty interval [path widths]: +/- 1.08 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .028", 2° ) * approx speed of asteroid's shadow [km/s]: 37.5902 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 26681444 by 524 Fidelio on 2007 Sep 01 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 -133 0 0 19 33 39 17 44 23 0 105 43 19 13 24 19 53 53 18 29 39 20 37 37 -132 0 0 19 17 44 17 44 23 1 106 44 18 57 27 19 38 0 18 13 37 20 21 48 -131 0 0 19 1 25 17 44 23 2 106 45 18 41 5 19 21 44 17 57 11 20 5 36 -130 0 0 18 44 42 17 44 24 3 106 46 18 24 21 19 5 3 17 40 22 19 49 0 -129 0 0 18 27 35 17 44 24 4 107 47 18 7 12 18 47 59 17 23 9 19 32 1 -128 0 0 18 10 5 17 44 24 5 107 48 17 49 40 18 30 31 17 5 32 19 14 38 -127 0 0 17 52 12 17 44 24 6 107 49 17 31 44 18 12 40 16 47 31 18 56 51 -126 0 0 17 33 56 17 44 25 7 108 50 17 13 26 17 54 26 16 29 8 18 38 42 -125 0 0 17 15 16 17 44 25 8 108 51 16 54 44 17 35 48 16 10 21 18 20 9 -124 0 0 16 56 13 17 44 26 9 108 52 16 35 39 17 16 48 15 51 11 18 1 14 -123 0 0 16 36 48 17 44 26 10 109 53 16 16 11 16 57 25 15 31 39 17 41 56 -122 0 0 16 17 1 17 44 27 11 109 54 15 56 21 16 37 39 15 11 44 17 22 15 -121 0 0 15 56 50 17 44 27 12 109 55 15 36 9 16 17 32 14 51 27 17 2 12 -120 0 0 15 36 18 17 44 28 13 109 56 15 15 35 15 57 2 14 30 48 16 41 47 -119 0 0 15 15 24 17 44 29 14 110 57 14 54 39 15 36 10 14 9 47 16 21 0 -118 0 0 14 54 9 17 44 29 16 110 58 14 33 21 15 14 57 13 48 24 15 59 52 -117 0 0 14 32 32 17 44 30 17 110 59 14 11 42 14 53 22 13 26 40 15 38 22 -116 0 0 14 10 34 17 44 31 18 110 60 13 49 42 14 31 27 13 4 35 15 16 32 -115 0 0 13 48 16 17 44 32 19 111 61 13 27 21 14 9 11 12 42 10 14 54 20 -114 0 0 13 25 37 17 44 33 20 111 62 13 4 40 13 46 34 12 19 24 14 31 48 -113 0 0 13 2 38 17 44 34 21 111 63 12 41 39 13 23 37 11 56 18 14 8 56 -112 0 0 12 39 20 17 44 35 22 111 64 12 18 18 13 0 21 11 32 53 13 45 45 -111 0 0 12 15 42 17 44 37 23 112 65 11 54 39 12 36 45 11 9 9 13 22 14 -110 0 0 11 51 45 17 44 38 24 112 66 11 30 40 12 12 51 10 45 6 12 58 24 -109 0 0 11 27 30 17 44 39 25 112 67 11 6 23 11 48 38 10 20 44 12 34 15 -108 0 0 11 2 57 17 44 40 26 112 68 10 41 48 11 24 7 9 56 5 12 9 48 -107 0 0 10 38 7 17 44 42 27 112 69 10 16 55 10 59 18 9 31 8 11 45 4 -106 0 0 10 12 59 17 44 43 28 112 70 9 51 46 10 34 12 9 5 54 11 20 2 -105 0 0 9 47 35 17 44 45 29 113 71 9 26 19 10 8 50 8 40 24 10 54 44 -104 0 0 9 21 54 17 44 47 30 113 72 9 0 37 9 43 12 8 14 38 10 29 10 -103 0 0 8 55 59 17 44 48 31 113 73 8 34 40 9 17 17 7 48 36 10 3 19 -102 0 0 8 29 48 17 44 50 32 113 74 8 8 27 8 51 8 7 22 20 9 37 14 -101 0 0 8 3 22 17 44 52 34 113 75 7 42 0 8 24 45 6 55 49 9 10 54 -100 0 0 7 36 43 17 44 53 35 113 76 7 15 19 7 58 7 6 29 5 8 44 20 - 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2007 Apr 25 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 116° remarks: * orbital elements for (524) Fidelio : Mean anomaly = 166.56082720 deg Arg. of pericenter = 79.32500687 deg Long. of node = 326.83459785 deg Inclination = 8.22288240 deg Eccentricity = 0.12870605 Semimajor axis = 2.63462179 AU Perihelion dist = 2.29553004 AU Mag: H = 9.81, G = 0.15 Epoch of elements : MJD 54344.74100000 TDT (2007 Sep 01.741) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 01 524 Fidelio 17h 47.2m UT 11.3 13 11 21.877-14 21 18.812UCAC 26681444 0.0 15.8 72 1.9 3.616 3.315 -18.50 -49.473 -14.350 -86.79 8.22 17.7869 -.00553 -.01273 19.80663 -7.60641 0.00343 -0.00190 2000 165.4681372007 828.00000 79.325007326.834598 8.2228820.128706052.634621792.295530049.835 0.15 RATE 2.3047650 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.028 2.4 2.080 0.029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 05, 22:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org