eta Geminorum Graze

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All times UT unless otherwise noted

Spectacular

April 9th eta Geminorum Graze in Dixon, California

Observing Site

Graze Prediction from WinOCCULT
Grazing Occultation of     946DM3      Magnitude 3.5 [Red = 2.5]  V
   R946 = Propus = eta Geminorum
Date: 2011 Apr 10  4h 38m,  to  2011 Apr 10  5h 16m
Nominal site altitude 34m
E. Longit.   Latitude     U.T.    Sun  Moon   TanZ   PA    AA      CA
   o   '      o   '     h  m  s   Alt Alt Az          o     o      o
-125  0.00   40  1.37   4 37 42       46 262  0.98  15.9  15.88  14.02N
-124  0.00   39 31.22   4 39 25       45 264  1.02  16.0  15.98  14.11N
-123  0.00   39  0.58   4 41  8       43 265  1.06  16.1  16.08  14.21N
-122  0.00   38 29.48   4 42 49       42 266  1.10  16.2  16.17  14.31N
-121 45.00   38 21.64   4 43 14       42 267  1.11  16.2  16.19  14.33N
-121  0.00   37 57.97   4 44 29       41 268  1.14  16.2  16.25  14.39N
-120  0.00   37 26.07   4 46  7       40 269  1.18  16.3  16.32  14.46N
-119  0.00   36 53.82   4 47 44       39 271  1.23  16.4  16.39  14.53N
-118  0.00   36 21.28   4 49 19       38 272  1.28  16.4  16.45  14.59N
-117  0.00   35 48.47   4 50 52       37 273  1.34  16.5  16.50  14.64N
-116  0.00   35 15.44   4 52 23       36 274  1.39  16.5  16.54  14.68N
-115  0.00   34 42.23   4 53 52       34 275  1.46  16.6  16.56  14.70N
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 1.83 km north, and 2.7 secs earlier compared to A
                Librations  Long -8.26   Lat +1.31
                            P +16.15     D -3.34
      Illumination of moon  36%+
        Elongation of Moon  74
    Vertical Profile Scale  2.10 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.86 deg/min
At longitude -105.00:
Limiting Magnitudes for various telescope apertures (in cm)
      CA\Tdia   5    10    15    20    25    30    35
    10.6      5.6   7.0   7.8   8.3   8.6   8.9   9.0
    12.6      5.6   7.0   7.8   8.3   8.6   8.9   9.1
    14.6      5.6   7.0   7.8   8.3   8.7   8.9   9.1
    16.6      5.6   7.1   7.8   8.3   8.7   8.9   9.1
    18.6      5.6   7.1   7.9   8.4   8.7   8.9   9.1
------------------------------------------------------------------------------
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     
 
 
------------------------------------------------ 
AAVSO Variable star entry 
 
       Variable identifier           Type        Max    Min  Ph  Epoch         Period  
       eta Gem                       SRA+EA      3.15   3.9  V 2437725.0000   232.9         
------------------------------------------------------------------------------
Results of Observer Scan                                    UT
Site                              Long.   Lat.   Dist.    h  m  s
BREIT IDEAS Obs - 12inch LX200   -121.7   37.1   113km    4 43 19
Profile

Results
Place name     eta Gem Graze - Dixon, CA                         
Email address  breit_ideas@hotmail.com                                     
Representative Derek C Breit                                               
TA  CED   31   305  -1215029.2  +382420.9  84   12  M
OA  D. Breit                                                               
2011 410 44228.664R   946 DDG    EG G0.04 1    0.300T111   AA
2011 410 44244.713R   946 RDG    EG G0.04 1    0.467T111   AA
2011 410 44245.147R   946 DDG    EG G0.04 1    0.267T111   AA
2011 410 44245.581R   946 RDG    EG G0.04 1    0.334T111   AA
2011 410 44246.515R   946 BDG    EG G0.04 1    0.800T111   AA
2011 410 44248.517R   946 DDG    EG G0.04 1    0.367T111   AA
2011 410 44249.051R   946 RDG    EG G0.04 1    0.501T111   AA
2011 410 44250.286R   946 DDG    EG G0.04 1    0.500T111   AA
2011 410 44316.046R   946 FDG    EG G0.04 1    0.467 111   AA
2011 410 44320.216R   946 RDG    EG G0.04 1    1.201T111   AA
2011 410 44324.788R   946 DDG    EG G0.04 1    0.734T111   AA
2011 410 44325.789R   946 RDG    EG G0.04 1    0.634T111   AA
2011 410 44327.190R   946 DDG    EG G0.04 1    0.501T111   AA
2011 410 44331.194R   946 RDG    EG G0.04 1    0.701T111   AA
2011 410 44332.796R   946 DDG    EG G0.04 1    0.133T111   AA
2011 410 44357.788R   946 RDG    EG G0.04 1    1.068T111   AA
 
See the Video.. Target is obvious.. Click HERE 6MB

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