Grazing Occultation of 2750 SB2 Magnitude 2.0 2750 = Nunki = sigma Sagittarii Date 2007 July 28 (Saturday) 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 171 0 0 -42 48 22 4 10 35 12 8 119 7.59 359.8 4.61 14.23N 171 10 0 -42 53 47 4 10 38 12 8 119 7.43 359.7 4.60 14.23N 171 20 0 -42 59 11 4 10 41 12 8 119 7.28 359.7 4.60 14.22N 171 30 0 -43 4 36 4 10 45 11 8 119 7.13 359.7 4.59 14.22N 171 40 0 -43 10 0 4 10 48 11 8 119 6.99 359.7 4.59 14.21N 171 50 0 -43 15 25 4 10 51 11 8 118 6.85 359.7 4.58 14.21N 172 0 0 -43 20 49 4 10 54 11 8 118 6.72 359.7 4.57 14.20N 172 10 0 -43 26 13 4 10 58 11 9 118 6.60 359.7 4.57 14.19N 172 20 0 -43 31 37 4 11 1 11 9 118 6.48 359.7 4.56 14.19N 172 30 0 -43 37 0 4 11 5 10 9 118 6.36 359.7 4.56 14.18N 172 40 0 -43 42 23 4 11 8 10 9 118 6.25 359.7 4.55 14.18N 172 50 0 -43 47 46 4 11 12 10 9 118 6.14 359.7 4.55 14.17N 173 0 0 -43 53 9 4 11 15 10 9 118 6.04 359.7 4.54 14.16N 173 10 0 -43 58 32 4 11 19 10 10 117 5.93 359.7 4.53 14.16N Path coordinates are referred to WGS84 (as used by GPS). 2750 is triple : 2.9 2.9 0.100" 90.0 : 2.0 9.5 309" 244.0 Graze Path of component #2 0.00km North, and 0.2 secs. later cf. primary. Graze Path of component #3 304.01km North, and 481.5 secs. earlier cf. primary. C A S S I N I R E G I O N G R A Z E Librations Long -4.24 Lat +4.98 P +4.2 D -5.0 Illumination of moon 96%+ Elongation of Moon 157 Vertical Profile Scale 2.28 km/arcsec at mean distance of moon Horizontal Scale Factor 2.14 deg/min Limiting Magnitudes for various telescope apertures (in mm) CA\Tdia 50 100 150 200 250 300 350 10.2 0.9 2.1 2.6 2.8 3.0 3.0 3.1 12.2 1.1 2.3 2.8 3.0 3.2 3.3 3.3 14.2 1.1 2.3 2.8 3.1 3.2 3.3 3.4 16.2 1.2 2.4 2.9 3.1 3.3 3.4 3.4 18.2 1.2 2.4 2.9 3.2 3.3 3.4 3.5