03/18/2002　21:50　Takahashi BRC-250　Bitran BJ-31LCCD camera
　L10min.x18　R5min.x2(2x2)　G5minx2(2x2)　B5minx2(2x2)
Tokai TYPEIII RGB filter　　LPS-P1 filter　StellaImage3　LRGB Photoshop6.0

NGC4258 (M106 Galaxy in Canes Venatici)　
12h18m58.1s +47 18 07 Mag(V)8.4 Dim18.6'x7.2' SB13.6 SAB(s)bcII- III