Grazing Occultation of 669SG7 Magnitude 3.8 [Red = 3.3] s R669 = theta 1 Tauri Date: 2017 Dec 30 22h 2m, to 2017 Dec 30 22h 30m 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 61 16 59.9 22 10 35 42 210 1.11 168.2 176.49 -5.99S 18 30 0 61 18 35.4 22 11 4 42 211 1.12 168.3 176.54 -6.05S 19 0 0 61 20 5.8 22 11 33 42 212 1.12 168.3 176.59 -6.10S 19 30 0 61 21 30.8 22 12 2 41 212 1.13 168.4 176.65 -6.15S 20 0 0 61 22 50.7 22 12 31 41 213 1.14 168.4 176.70 -6.20S 20 30 0 61 24 5.3 22 12 59 41 214 1.15 168.5 176.75 -6.25S 21 0 0 61 25 14.8 22 13 27 41 215 1.15 168.5 176.80 -6.31S 21 30 0 61 26 19.1 22 13 56 41 215 1.16 168.6 176.86 -6.37S 22 0 0 61 27 18.3 22 14 24 41 216 1.17 168.6 176.91 -6.42S 22 30 0 61 28 12.4 22 14 51 40 217 1.18 168.7 176.96 -6.47S 23 0 0 61 29 1.4 22 15 19 40 218 1.18 168.7 177.02 -6.52S 23 30 0 61 29 45.3 22 15 47 40 218 1.19 168.8 177.07 -6.57S 24 0 0 61 30 24.2 22 16 14 40 219 1.20 168.8 177.12 -6.62S 24 30 0 61 30 58.1 22 16 41 40 220 1.21 168.9 177.17 -6.67S 25 0 0 61 31 27.0 22 17 9 39 221 1.22 168.9 177.22 -6.72S 25 30 0 61 31 50.8 22 17 36 39 221 1.23 169.0 177.27 -6.77S 26 0 0 61 32 9.7 22 18 2 39 222 1.24 169.0 177.32 -6.82S 26 30 0 61 32 23.6 22 18 29 39 223 1.24 169.1 177.37 -6.87S 27 0 0 61 32 32.6 22 18 56 39 223 1.25 169.1 177.42 -6.92S 27 30 0 61 32 36.7 22 19 22 38 224 1.26 169.2 177.47 -6.97S 28 0 0 61 32 35.8 22 19 48 38 225 1.27 169.2 177.52 -7.02S 28 30 0 61 32 30.1 22 20 14 38 225 1.28 169.3 177.57 -7.07S 29 0 0 61 32 19.4 22 20 40 38 226 1.29 169.3 177.62 -7.12S 29 30 0 61 32 3.9 22 21 6 38 227 1.30 169.4 177.66 -7.17S 30 0 0 61 31 43.5 22 21 32 37 228 1.31 169.4 177.71 -7.22S 30 30 0 61 31 18.2 22 21 58 37 228 1.32 169.5 177.76 -7.27S 31 0 0 61 30 48.2 22 22 23 37 229 1.33 169.5 177.81 -7.31S 31 30 0 61 30 13.2 22 22 48 37 230 1.34 169.6 177.86 -7.36S 32 0 0 61 29 33.5 22 23 13 36 230 1.35 169.6 177.90 -7.41S 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 6 meters [CHARM/CADARS, 18 measures] 669 is variable: 669 = NSV 16016, 3.84, range 0.21, V 669 is triple: Aa,Ab 3.8 7.3 0.22" 354.4 (MCA 15) Graze path of Ab approximately 0.6 km south, and 0.0 secs later compared to Aa - refer to graze profile for exact distances AB 3.8 12.0 266" 75.0 (BPMA 7) Graze path of B approximately 48.7 km south, and 519.4 secs later compared to A - refer to graze profile for exact distances Librations Long -4.16 Lat +6.90 P +176.68 D +6.95 Illumination of moon 93%+ Elongation of Moon 148 Vertical Profile Scale approx. 2.51 km/arcsec at mean distance of moon Horizontal Scale Factor 1.78 deg/min At longitude 25.00: Limiting Magnitudes for various telescope apertures (in cm) CA\Tdia 5 10 15 20 25 30 35 -10.7 2.4 3.8 4.5 5.0 5.3 5.5 5.6 -8.7 2.4 3.8 4.5 5.0 5.3 5.5 5.6 -6.7 2.4 3.8 4.5 5.0 5.3 5.5 5.6 -4.7 2.4 3.8 4.5 5.0 5.3 5.5 5.6 -2.7 2.4 3.8 4.5 5.0 5.3 5.5 5.6 ------------------------------------------------------------------------------ Results of Observer Scan UT Site Long. Lat. Dist. h m s Tampere Kauppi 23.8 61.5 1km 22 16 2.8 Ulvila Vesitorni 21.9 61.4 2km 22 14 19.5 Pori 21.8 61.5 4km 22 14 12.4 Hartola 26.0 61.6 5km 22 18 3.4 Kangasala 24.0 61.4 12km 22 16 14.2 Mäntyharju 26.9 61.4 14km 22 18 49.5 Mikkeli Kiiskinmäki 27.2 61.7 16km 22 19 8.3 Imatra 28.8 61.2 35km 22 20 28.7 Savonlinna 28.9 61.9 36km 22 20 34.0 Merikarvia 21.5 61.9 46km 22 13 55.7 Lappeenranta 28.2 61.1 54km 22 19 58.1 Hämeenlinna 24.4 61.0 58km 22 16 37.6 Lahti Pirttiharju 25.6 61.0 61km 22 17 40.3 Loimaa 23.1 60.8 71km 22 15 22.0 Forssa 23.6 60.8 77km 22 15 54.0 Jyväskylä Rihlaperä 25.7 62.2 78km 22 17 46.5 Varkaus 27.9 62.3 85km 22 19 42.0 Artjärvi Tähtikallio 26.2 60.7 89km 22 18 13.7