Grazing Occultation of 1660SK0 Magnitude 6.6 [Red = 6.1] R1660 = 83 Leonis Date: 2016 Jan 27 20h 30m, to 2016 Jan 27 20h 33m 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 15 0 0 66 11 18.2 20 29 33 6 95 10.36 17.9 353.17 6.10N 15 30 0 66 11 28.4 20 29 35 6 96 9.98 17.9 353.19 6.07N 16 0 0 66 11 35.5 20 29 38 6 96 9.63 17.9 353.23 6.04N 16 30 0 66 11 39.4 20 29 40 6 97 9.31 18.0 353.26 6.00N 17 0 0 66 11 40.1 20 29 43 6 97 9.00 18.0 353.29 5.97N 17 30 0 66 11 37.7 20 29 46 7 98 8.72 18.0 353.32 5.94N 18 0 0 66 11 32.1 20 29 49 7 98 8.45 18.1 353.35 5.91N 18 30 0 66 11 23.4 20 29 52 7 99 8.20 18.1 353.39 5.88N 19 0 0 66 11 11.5 20 29 56 7 99 7.96 18.1 353.42 5.84N 19 30 0 66 10 56.3 20 29 59 7 99 7.73 18.2 353.45 5.81N 20 0 0 66 10 38.0 20 30 3 8 100 7.52 18.2 353.48 5.78N 20 30 0 66 10 16.5 20 30 7 8 100 7.32 18.2 353.52 5.74N 21 0 0 66 9 51.8 20 30 10 8 101 7.13 18.3 353.55 5.71N 21 30 0 66 9 23.8 20 30 14 8 101 6.94 18.3 353.58 5.68N 22 0 0 66 8 52.6 20 30 19 8 102 6.77 18.3 353.62 5.65N 22 30 0 66 8 18.1 20 30 23 9 102 6.60 18.4 353.65 5.61N 23 0 0 66 7 40.3 20 30 27 9 103 6.45 18.4 353.68 5.58N 23 30 0 66 6 59.3 20 30 32 9 103 6.30 18.4 353.72 5.54N 24 0 0 66 6 14.9 20 30 36 9 104 6.15 18.5 353.75 5.51N 24 30 0 66 5 27.2 20 30 41 9 104 6.01 18.5 353.79 5.48N 25 0 0 66 4 36.2 20 30 46 10 105 5.88 18.5 353.82 5.44N 25 30 0 66 3 41.8 20 30 51 10 105 5.75 18.6 353.85 5.41N 26 0 0 66 2 44.2 20 30 56 10 106 5.63 18.6 353.89 5.37N 26 30 0 66 1 43.1 20 31 1 10 106 5.51 18.6 353.92 5.34N 27 0 0 66 0 38.6 20 31 7 10 107 5.40 18.7 353.96 5.30N 27 30 0 65 59 30.7 20 31 12 11 107 5.29 18.7 353.99 5.27N 28 0 0 65 58 19.4 20 31 18 11 108 5.19 18.8 354.03 5.23N 28 30 0 65 57 4.7 20 31 24 11 108 5.09 18.8 354.06 5.20N 29 0 0 65 55 46.5 20 31 30 11 109 4.99 18.8 354.10 5.16N 29 30 0 65 54 24.8 20 31 36 12 109 4.90 18.9 354.14 5.13N 30 0 0 65 52 59.6 20 31 42 12 110 4.81 18.9 354.17 5.09N 30 30 0 65 51 30.9 20 31 49 12 110 4.72 18.9 354.21 5.05N 31 0 0 65 49 58.7 20 31 55 12 111 4.63 19.0 354.24 5.02N 31 30 0 65 48 22.9 20 32 2 12 111 4.55 19.0 354.28 4.98N 32 0 0 65 46 43.6 20 32 9 13 112 4.47 19.0 354.32 4.94N 32 30 0 65 45 0.6 20 32 16 13 112 4.40 19.1 354.35 4.91N 33 0 0 65 43 14.0 20 32 23 13 113 4.32 19.1 354.39 4.87N 33 30 0 65 41 23.8 20 32 31 13 113 4.25 19.2 354.43 4.83N 34 0 0 65 39 29.9 20 32 38 13 114 4.18 19.2 354.47 4.80N 34 30 0 65 37 32.4 20 32 46 14 114 4.11 19.2 354.50 4.76N 35 0 0 65 35 31.1 20 32 53 14 115 4.05 19.3 354.54 4.72N 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 2 meters [Estimated] 1660 is triple: AB 6.6 7.5 35" 239.6 (STF1540) Graze path of B 70.85 km north, and 48.8 secs earlier compared to A AC 6.6 11.1 214" 193.2 (STF1540) Graze path of C 566.99 km north, and 41.9 secs later compared to A Librations Long +3.01 Lat +0.85 P +353.86 D -0.91 Illumination of moon 86%- Elongation of Moon 136 Vertical Profile Scale approx. 2.77 km/arcsec at mean distance of moon Horizontal Scale Factor 1.83 deg/min At longitude 25.00: Limiting Magnitudes for various telescope apertures (in cm) CA\Tdia 5 10 15 20 25 30 35 1.4 1.9 3.1 3.7 3.9 4.1 4.2 4.2 3.4 2.4 3.6 4.1 4.4 4.6 4.7 4.7 5.4 3.5 4.8 5.3 5.6 5.8 5.9 6.0 7.4 3.5 4.8 5.4 5.7 5.8 5.9 6.0 9.4 3.8 5.1 5.6 6.0 6.1 6.2 6.3 ------------------------------------------------------------------------------ Double star catalogue details WDS entries RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2 11268+0301STF1540AB 1780 2013 129 145 150 29.5 28.2 6.55 7.50 G7V -726+181 -728+186 +03 2502 NOD 112645.75+030045.6 11268+0301STF1540AC 1936 2009 6 191 193 91.6 203.3 6.55 11.13 G7V -726+181 NU 112645.75+030045.6 ------------------------------------------------ Interferometric catalogue entries 112645.75+030045.6 BD+03 2502 STF1540A HD 99491 HIP 55846 11268+03 Date PA Sep M1 M2 N 2001.0311 . . < 0.03 . . . . . 550 24 3.8 1 Msn2012x S 2007.18141 . . < 0.008 >0.080 . . > 1.5 . 2133 349 330.7 1 CIA2012a K 2008.28406 . . < 0.008 >0.080 . . > 1.5 . 2133 349 330.7 1 CIA2012a K 2008.28677 . . < 0.008 >0.080 . . > 1.5 . 2133 349 278.5 1 CIA2012a K 112645.75+030045.6 BD+03 2502 STF1540AB HD 99491 HIP 55846 11268+03 Date PA Sep M1 M2 N O 1991.25 149.6 . 28.36 . 6.634 0.008 7.697 0.016 511 222 0.3 1 HIP1997a H 1991.68 149.7 . 28.441 . 6.553 0.010 7.500 0.013 530 100 1.4 1 TYC2000c H 1991.68 . . . . 7.477 0.016 8.724 0.020 430 90 1.4 1 TYC2000c H 112646.27+030022.7 ADS 8162 STF1540B HD 99492 HIP 55848 11268+03 Date PA Sep M1 M2 N 2008.28404 . . < 0.008 >0.080 . . > 1.5 . 2133 349 330.7 1 CIA2012a K 2008.28679 . . < 0.008 >0.080 . . > 1.5 . 2133 349 278.5 1 CIA2012a K ------------------------------------------------------------------------------ Results of Observer Scan UT Site Long. Lat. Dist. h m s Enontekiö 23.6 68.4 251km 20 30 33 Kajaani Lehtikangas 27.7 64.2 195km 20 31 15 Kemijärvi 27.4 66.7 80km 20 31 12 Kuhmo 29.5 64.1 196km 20 31 36 Kuusamo 29.2 66.0 5km 20 31 33 Meltaus 25.4 66.9 94km 20 30 50 Muonio 23.7 68.0 204km 20 30 33 Oulu Puolivälikangas 25.5 65.0 113km 20 30 51 Pello 24.0 66.8 74km 20 30 36 Posio 28.2 66.1 16km 20 31 20 Pudasjärvi 27.0 65.4 72km 20 31 7 Puolanka 27.7 64.9 124km 20 31 15 Raahe 24.5 64.7 155km 20 30 41 Ranua 26.5 65.9 11km 20 31 2 Rovaniemi 25.7 66.5 49km 20 30 53 Salla 28.7 66.8 98km 20 31 26 Sodankylä 26.6 67.4 153km 20 31 3 Tervola 24.8 66.1 0km 20 30 44 Tornio 24.1 65.8 28km 20 30 38 Tulppio 29.2 67.8 204km 20 31 33