Object name: NGC3646
Designation(s): NGC3646, NGC3649,
NGC 3646 is a very peculiar spiral galaxy in Leo. Its inner spiral structure is that of a normal flocculent spiral but the outer structure is chaotic at best. One note at NED reads: "...The spiral pattern is very odd. One spiral arm emerges from the SE end of the inner disk and turns counterclockwise. Another emerges from the NW side of the inner disk and turns clockwise. These two arms appear to merge on the SW side of the galaxy, joining in a point. The arm structure on the west side is very well defined, and HSB, with many bright knots. On the east side, the arms are diffuse and patchy, with fewer knots. There is an LSB outer disk on the west side. The referee suggests, and we agree, that this may be an example of a galaxy with visible leading and trailing arms." I'm not sure I see the bi-directional arms but two certainly meet at a point on the southwest side.
Related Designation(s):2MASS J11214308+2010103, 2MASS J11221473+2012304, 2MASX J11214310+2010103, 2MASX J11221474+2012310, 2MASXi J1121431+201014, 2MASXi J1122147+201231, ADBS J112134+2010, AKARI J1121433+201010, CGCG 096-034, CGCG 096-036, CGCG 1119.0+2026, CGCG 1119.6+2028, ECO 12254, HDCE 0644 NED002, HDCE 0644 NED003, HIPASS J1121+20, IC 0682, KPG 281A, KPG 281B, LDCE 0801 NED002, LDCE 0801 NED003, MCG +03-29-037, MCG +03-29-038, NGC 3646, NGC 3646:[ZSF97] a, NGC 3649, NGC3646, NGC3649, NSA 139267, NSA 159673, NVSS J112143+201011, PGC 034836, PGC 034883, SDSS J112143.07+201010.3, SDSS J112143.08+201010.3, UGC 06376, UGC 06386, USGC U382 NED02, USGC U382 NED03, UVQS J112214.74+201230.3, UZC J112143.1+201011, UZC J112214.8+201230, [M98j] 121 NED01, [M98j] 121 NED02,