Canes Venatici Spiral Galaxy M51(NGC5194) "Whirlpool Galaxy"

 Date and Time    : 1999.2.21 02:50
 Optical Equipment: D8inch/f1,800mm/F9 Cassegrain/VISAC equatrial.
                    with SKY SENSOR2000PC. 
                    Direct Focus with a reducer VC200L (f1278mm/F6.4).
 Camera           : Cooled CCD (Mutoh CV-04/2LH) -27.0deg.C 
 Filters          : Koh-ei's multicoated filters UV, R:R60t2, G:G533t2, 
                    B:B440t2, and IR-Interference.
 Exposure Time    : L:600sec.(Composit of 240sec.X1 + 120sec.X3). 
                    R:240sec. G:240sec. B:240sec.
 Pinning          : L:2X2, R:2X2, G:2X2, B:2X2
 Graphic Process  : Composit of 4 colors and others with "Stella Image2"


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