Grazing Occultation of 810 SB7 Magnitude 1.6 810 = El Nath = beta Tauri Date 2006 March 7 (Tuesday) Nominal site altitude 0m E. Longit. Latitude U.T. Sun Moon TanZ PA WA CA o ' " o ' " h m s Alt Alt Az o o o 113 0 0 -23 14 37 7 1 43 51 14 50 4.13 162.0 165.18 15.27S 113 10 0 -23 8 4 7 1 48 51 14 50 4.07 162.0 165.17 15.28S 113 20 0 -23 1 31 7 1 54 51 14 50 4.01 161.9 165.15 15.30S 113 30 0 -22 54 57 7 2 0 51 14 50 3.95 161.9 165.14 15.31S 113 40 0 -22 48 23 7 2 6 51 14 50 3.89 161.9 165.12 15.33S 113 50 0 -22 41 48 7 2 13 51 15 50 3.83 161.9 165.11 15.34S 114 0 0 -22 35 12 7 2 19 51 15 50 3.77 161.9 165.09 15.36S 114 10 0 -22 28 36 7 2 26 50 15 50 3.72 161.9 165.08 15.37S 114 20 0 -22 22 0 7 2 32 50 15 50 3.67 161.9 165.06 15.39S 114 30 0 -22 15 23 7 2 39 50 15 50 3.61 161.8 165.05 15.40S 114 40 0 -22 8 46 7 2 46 50 16 49 3.56 161.8 165.03 15.42S 114 50 0 -22 2 8 7 2 53 50 16 49 3.51 161.8 165.02 15.43S 115 0 0 -21 55 30 7 3 0 50 16 49 3.47 161.8 165.01 15.44S 115 10 0 -21 48 52 7 3 7 50 16 49 3.42 161.8 164.99 15.46S 115 20 0 -21 42 13 7 3 15 49 17 49 3.37 161.8 164.98 15.47S 115 30 0 -21 35 33 7 3 22 49 17 49 3.33 161.8 164.97 15.49S 115 40 0 -21 28 53 7 3 30 49 17 49 3.28 161.7 164.95 15.50S 115 50 0 -21 22 13 7 3 38 49 17 49 3.24 161.7 164.94 15.51S 116 0 0 -21 15 32 7 3 46 49 17 49 3.20 161.7 164.93 15.52S Path coordinates are referred to WGS84 (as used by GPS). 810 is triple : 2.6 2.6 0.100" 270.0 : 1.6 33" 239.0 Graze Path of component #2 0.07km South, and 0.2 secs. earlier cf. primary. Graze Path of component #3 15.54km North, and 78.1 secs. earlier cf. primary. Librations Long +7.82 Lat -7.12 P +164.0 D -4.6 Illumination of moon 55%+ Elongation of Moon 96 Vertical Profile Scale 2.18 km/arcsec at mean distance of moon Horizontal Scale Factor 1.55 deg/min Limiting Magnitudes for various telescope apertures (in mm) CA\Tdia 50 100 150 200 250 300 350 11.5 2.7 4.0 4.7 5.0 5.2 5.3 5.4 13.5 2.7 4.0 4.7 5.0 5.2 5.3 5.4 15.5 2.7 4.0 4.7 5.0 5.2 5.3 5.4 17.5 2.7 4.0 4.7 5.0 5.2 5.3 5.4 19.5 2.7 4.0 4.7 5.0 5.2 5.3 5.4