Grazing Occultation of 640 F0 Magnitude 5.3 [Red = 5.1] v R640 = 58 Tauri (V696) Date: 2017 Mar 04 21h 16m, to 2017 Mar 04 21h 31m Nominal site altitude 100m E. Longit. Latitude U.T. Sun Moon TanZ PA AA CA o ' " o ' " h m s Alt Alt Az o o o 18 0 0 64 41 29.2 21 22 53 20 264 2.82 172.5 182.03 -1.25S 18 30 0 64 36 34.4 21 23 8 19 265 2.86 172.6 182.06 -1.28S 19 0 0 64 31 35.4 21 23 22 19 265 2.89 172.6 182.08 -1.30S 19 30 0 64 26 32.3 21 23 36 19 266 2.93 172.6 182.11 -1.33S 20 0 0 64 21 25.1 21 23 51 19 266 2.97 172.6 182.14 -1.36S 20 30 0 64 16 13.8 21 24 5 18 267 3.01 172.7 182.17 -1.39S 21 0 0 64 10 58.3 21 24 19 18 267 3.06 172.7 182.20 -1.42S 21 30 0 64 5 38.7 21 24 32 18 268 3.10 172.7 182.22 -1.44S 22 0 0 64 0 14.9 21 24 46 18 268 3.15 172.8 182.25 -1.47S 22 30 0 63 54 47.0 21 25 0 17 269 3.19 172.8 182.28 -1.50S 23 0 0 63 49 15.7 21 25 13 17 269 3.24 172.8 182.31 -1.53S 23 30 0 63 43 39.5 21 25 26 17 270 3.29 172.8 182.33 -1.55S 24 0 0 63 37 59.2 21 25 39 17 271 3.34 172.9 182.36 -1.58S 24 30 0 63 32 14.9 21 25 52 16 271 3.40 172.9 182.39 -1.61S 25 0 0 63 26 26.4 21 26 5 16 272 3.45 172.9 182.41 -1.63S 25 30 0 63 20 33.9 21 26 18 16 272 3.51 172.9 182.44 -1.66S 26 0 0 63 14 37.3 21 26 31 16 273 3.57 173.0 182.47 -1.69S 26 30 0 63 8 36.7 21 26 43 15 273 3.63 173.0 182.49 -1.71S 27 0 0 63 2 32.0 21 26 55 15 274 3.70 173.0 182.52 -1.74S 27 30 0 62 56 22.2 21 27 8 15 274 3.76 173.0 182.54 -1.76S 28 0 0 62 50 9.0 21 27 20 15 275 3.83 173.1 182.57 -1.79S 28 30 0 62 43 52.2 21 27 31 14 275 3.91 173.1 182.59 -1.81S 29 0 0 62 37 31.3 21 27 43 14 276 3.98 173.1 182.62 -1.84S 29 30 0 62 31 6.5 21 27 55 14 276 4.06 173.1 182.64 -1.86S 30 0 0 62 24 37.8 21 28 6 14 277 4.14 173.2 182.67 -1.89S 30 30 0 62 18 5.1 21 28 17 13 277 4.23 173.2 182.69 -1.91S 31 0 0 62 11 28.5 21 28 28 13 278 4.32 173.2 182.72 -1.94S 31 30 0 62 4 48.0 21 28 39 13 278 4.41 173.2 182.74 -1.96S 32 0 0 61 58 3.6 21 28 49 13 279 4.51 173.3 182.77 -1.98S Path coordinates are referred to WGS84 (as used by GPS), with the nominal site altitude being referenced to Mean Sea Level. The path is adjusted for the effects of refraction at low moon altitudes. Projected diameter of star 1 meters [CHARM/CADARS, 2 measures] 640 is variable: 640 = V0696 Tau, 5.22 to 5.28, V, Type DSCTC, Period 0.036 days Librations Long +0.33 Lat +7.55 P +182.34 D +7.79 Illumination of moon 43%+ Elongation of Moon 82 Vertical Profile Scale approx. 2.86 km/arcsec at mean distance of moon Horizontal Scale Factor 2.02 deg/min At longitude 22.50: Limiting Magnitudes for various telescope apertures (in cm) CA\Tdia 5 10 15 20 25 30 35 -5.5 2.8 4.2 4.8 5.2 5.4 5.5 5.6 -3.5 2.8 4.2 4.8 5.2 5.4 5.5 5.6 -1.5 2.8 4.2 4.8 5.2 5.4 5.5 5.6 0.5 4.5 5.9 6.6 7.0 7.3 7.4 7.6 2.5 4.5 5.9 6.6 7.0 7.3 7.5 7.6 ------------------------------------------------------------------------------ Results of Observer Scan UT Site Long. Lat. Dist. h m s Kuopio Huuhanmäki 27.6 62.9 2km 21 27 11.0 Kokkola 23.1 63.8 3km 21 25 16.3 Joensuu Jakokoski 30.0 62.7 32km 21 28 5.6 Nilsiä 28.1 63.2 39km 21 27 21.5 Rautalampi 26.7 62.6 54km 21 26 47.9 Varkaus 27.9 62.3 56km 21 27 16.5 Savonlinna 28.9 61.9 79km 21 27 40.0 Nurmes 29.1 63.5 95km 21 27 46.2