Grazing Occultation of 946DM3 Magnitude 3.5 [Red = 2.5] V R946 = Propus = eta Geminorum Date: 2011 Apr 10 4h 41m, to 2011 Apr 10 4h 51m Nominal site altitude 22m E. Longit. Latitude U.T. Sun Moon TanZ PA AA CA o ' o ' h m s Alt Alt Az o o o -123 0.00 39 0.57 4 41 8 43 265 1.06 16.1 16.08 14.22N -122 54.00 38 57.48 4 41 18 43 265 1.06 16.1 16.08 14.22N -122 48.00 38 54.38 4 41 28 43 265 1.06 16.1 16.09 14.23N -122 42.00 38 51.28 4 41 38 43 265 1.07 16.1 16.10 14.24N -122 36.00 38 48.18 4 41 48 43 266 1.07 16.1 16.11 14.25N -122 30.00 38 45.07 4 41 59 43 266 1.08 16.1 16.12 14.26N -122 24.00 38 41.96 4 42 9 43 266 1.08 16.1 16.13 14.27N -122 18.00 38 38.85 4 42 19 43 266 1.08 16.1 16.14 14.28N -122 12.00 38 35.73 4 42 29 43 266 1.09 16.1 16.15 14.29N -122 6.00 38 32.60 4 42 39 42 266 1.09 16.2 16.16 14.30N -122 0.00 38 29.47 4 42 49 42 266 1.10 16.2 16.17 14.31N -121 54.00 38 26.34 4 42 59 42 267 1.10 16.2 16.18 14.31N -121 48.00 38 23.20 4 43 9 42 267 1.10 16.2 16.18 14.32N -121 42.00 38 20.06 4 43 19 42 267 1.11 16.2 16.19 14.33N -121 36.00 38 16.91 4 43 29 42 267 1.11 16.2 16.20 14.34N -121 30.00 38 13.76 4 43 39 42 267 1.12 16.2 16.21 14.35N -121 24.00 38 10.61 4 43 49 42 267 1.12 16.2 16.22 14.36N -121 18.00 38 7.45 4 43 59 42 267 1.13 16.2 16.23 14.37N -121 12.00 38 4.29 4 44 9 42 268 1.13 16.2 16.23 14.37N -121 6.00 38 1.12 4 44 19 41 268 1.13 16.2 16.24 14.38N -121 0.00 37 57.96 4 44 29 41 268 1.14 16.2 16.25 14.39N -120 54.00 37 54.78 4 44 39 41 268 1.14 16.2 16.26 14.40N -120 48.00 37 51.60 4 44 49 41 268 1.15 16.3 16.27 14.40N -120 42.00 37 48.42 4 44 59 41 268 1.15 16.3 16.27 14.41N -120 36.00 37 45.24 4 45 9 41 268 1.16 16.3 16.28 14.42N -120 30.00 37 42.05 4 45 18 41 269 1.16 16.3 16.29 14.43N -120 24.00 37 38.86 4 45 28 41 269 1.16 16.3 16.30 14.44N -120 18.00 37 35.66 4 45 38 41 269 1.17 16.3 16.30 14.44N -120 12.00 37 32.46 4 45 48 40 269 1.17 16.3 16.31 14.45N -120 6.00 37 29.26 4 45 58 40 269 1.18 16.3 16.32 14.46N -120 0.00 37 26.06 4 46 7 40 269 1.18 16.3 16.32 14.46N -119 54.00 37 22.85 4 46 17 40 269 1.19 16.3 16.33 14.47N -119 48.00 37 19.63 4 46 27 40 269 1.19 16.3 16.34 14.48N -119 42.00 37 16.42 4 46 37 40 270 1.20 16.3 16.35 14.48N -119 36.00 37 13.20 4 46 46 40 270 1.20 16.3 16.35 14.49N -119 30.00 37 9.97 4 46 56 40 270 1.21 16.4 16.36 14.50N -119 24.00 37 6.75 4 47 6 40 270 1.21 16.4 16.37 14.50N -119 18.00 37 3.52 4 47 15 39 270 1.22 16.4 16.37 14.51N -119 12.00 37 0.29 4 47 25 39 270 1.22 16.4 16.38 14.52N -119 6.00 36 57.05 4 47 35 39 270 1.23 16.4 16.38 14.52N -119 0.00 36 53.81 4 47 44 39 271 1.23 16.4 16.39 14.53N -118 54.00 36 50.57 4 47 54 39 271 1.24 16.4 16.40 14.54N -118 48.00 36 47.33 4 48 3 39 271 1.24 16.4 16.40 14.54N -118 42.00 36 44.08 4 48 13 39 271 1.25 16.4 16.41 14.55N -118 36.00 36 40.83 4 48 22 39 271 1.25 16.4 16.42 14.55N -118 30.00 36 37.58 4 48 32 39 271 1.26 16.4 16.42 14.56N -118 24.00 36 34.32 4 48 41 38 271 1.26 16.4 16.43 14.57N -118 18.00 36 31.06 4 48 51 38 271 1.27 16.4 16.43 14.57N -118 12.00 36 27.80 4 49 0 38 272 1.27 16.4 16.44 14.58N -118 6.00 36 24.53 4 49 10 38 272 1.28 16.4 16.44 14.58N -118 0.00 36 21.27 4 49 19 38 272 1.28 16.4 16.45 14.59N -117 54.00 36 18.00 4 49 29 38 272 1.29 16.4 16.45 14.59N -117 48.00 36 14.73 4 49 38 38 272 1.29 16.5 16.46 14.60N -117 42.00 36 11.45 4 49 47 38 272 1.30 16.5 16.46 14.60N -117 36.00 36 8.17 4 49 57 37 272 1.30 16.5 16.47 14.61N -117 30.00 36 4.89 4 50 6 37 272 1.31 16.5 16.47 14.61N -117 24.00 36 1.61 4 50 15 37 272 1.31 16.5 16.48 14.62N -117 18.00 35 58.33 4 50 24 37 273 1.32 16.5 16.48 14.62N -117 12.00 35 55.04 4 50 34 37 273 1.33 16.5 16.49 14.63N -117 6.00 35 51.75 4 50 43 37 273 1.33 16.5 16.49 14.63N -117 0.00 35 48.46 4 50 52 37 273 1.34 16.5 16.50 14.64N Path coordinates are referred to WGS84 (as used by GPS), with the nominal site altitude being referenced to Mean Sea Level. Projected diameter of star 24 meters [CHARM/CADARS, 12 measures] 946 is variable: 946 = eta Gem, 3.15 to 3.9, V, Type SRA+EA, Period 232.9 days, Phase 1 % 946 is double: AB 3.5 6.2 1.6" 253.5 (BU 1008) Graze path of B 1.82 km north, and 3.0 secs earlier compared to A Librations Long -8.07 Lat +1.31 P +16.04 D -3.27 Illumination of moon 36%+ Elongation of Moon 74 Vertical Profile Scale 2.10 km/arcsec at mean distance of moon Horizontal Scale Factor 1.64 deg/min At longitude -120.00: Limiting Magnitudes for various telescope apertures (in cm) CA\Tdia 5 10 15 20 25 30 35 10.5 5.9 7.4 8.2 8.7 9.1 9.4 9.6 12.5 5.9 7.4 8.2 8.7 9.1 9.4 9.6 14.5 5.9 7.4 8.2 8.7 9.1 9.4 9.6 16.5 5.9 7.4 8.2 8.8 9.1 9.4 9.7 18.5 5.9 7.4 8.2 8.8 9.2 9.4 9.7 ------------------------------------------------------------------------------ Double star catalogue details WDS entries RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2 06149+2230BU 1008 1881 2008 101 300 257 1.1 1.8 3.52 6.15 M3.5I-II +22 1241 NOD 061452.69+223024.6 ------------------------------------------------ Interferometric catalogue entries 061452.69+223024.6 ADS 4841 BU 1008AB HD 42995 HIP 29655 06149+2230 N O Date PA Sep M1 M2 1976.8604 263.8 0.2 1.584 0.010 . . . . 552 20 3.8 1 McA1978b Sch 1977.1799 269.4 . 1.601 . . . . . 552 20 2.1 1 McA1982b Sch 1991.25 260.6 . 1.705 . 3.38 . 6.07 . 550 0.3 1 HIP1997a Thp 1991.25 . . . . 3.55 . 6.25 0.01 505 97 0.3 1 Fab2000a Thp 1991.25 . . . . 5.49 . 7.46 0.01 435 70 0.3 1 Fab2000a Thp 1991.93 261.9 . 1.759 . 3.52 . 6.15 . 530 100 1.4 1 TYC2000a Tty 2004.241 258.5 0.3 1.765 0.022 . . . . 530 57 1.0 1 Sca2005a Spe 2005.111 257.2 0.3 1.703 0.012 . . . . 644 70 1.0 1 Sca2007a Spe 2006.128 256.2 2. 1.65 0.06 . . . . 700 200 1.0 1 Orl2007 Spe 2008.243 257.2 0.3 1.787 0.009 . . . . 530 57 1.0 1 Pru2010 Spe 061452.70+223024.6 eta Gem BU 1008A HD 42995 HIP 29655 06149+2230 N Date PA Sep M1 M2 1975.9566 . . < 0.033 . . . . . 517 20 3.8 1 McA1978c Sch 1977.0870 . . < 0.035 . . . . . 552 20 3.8 1 McA1978c Sch 1979.7709 . . < 0.033 . . . . . 470 3.8 1 McA1981b Sch 1982.1679 . . < 0.028 . . . . . 550 ? 3.6 1 Bag1984b Spe 1982.1706 . . < 0.028 . . . . . 550 ? 3.6 1 Bag1984b Spe 1983.9340 . . < 0.06 . . . . . 550 3 2.0 1 Bnu1984 Spe 1988.807 . . < 0.05 . . . . . 2.1 1 Iso1991 Spe 1988.8087 . . < 0.05 . . . . . 2.1 1 Iso1990b Spe 1988.8114 . . < 0.05 . . . . . 2.1 1 Iso1990b Spe 1991.25 . . . . 3.382 0.014 6.070 0.149 511 222 0.3 1 HIP1997f Thp ------------------------------------------------------------------------------ Results of Observer Scan UT Site Long. Lat. Dist. h m s Cabrillo -121.9 37.0 134km 4 42 57 Ponderosa -121.4 36.0 202km 4 43 51 RedRock -118.0 35.4 90km 4 49 19