Intermediate spiral galaxy

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Messier 83 is an intermediate spiral galaxy of type SABc located in the constellation Hydra.

An intermediate spiral galaxy is a galaxy that is in between the classifications of a barred spiral galaxy and an unbarred spiral galaxy. It is designated as SAB in the galaxy morphological classification system devised by Gerard de Vaucouleurs.^[1] Subtypes are labeled as SAB0, SABa, SABb, or SABc, following a sequence analogous to the Hubble sequence for barred and unbarred spirals. The subtype (0, a, b, or c) is based on the relative prominence of the central bulge and how tightly wound the spiral arms are.

Diagram of the Hubble - de Vaucouleurs morphological classification system illustrating the class of intermediate spirals.

Examples

Example	Type	Image	Information	Notes
	SAB0-		SAB0- is a type of lenticular galaxy
	SAB0		SAB0 is a type of lenticular galaxy
	SAB0+		SAB0+ is a type of lenticular galaxy
	SAB0/a		SAB0/a can also be considered a type of intermediate lenticular galaxy
Messier 65	SABa	File:Messier object 065.jpg		M65 is an "SAB(rs)a"
NGC 4725	SABab	File:NGC 4725.jpg		NGC 4725 is an "SAB(r)ab pec"
Messier 66	SABb	File:Phot-33c-03-fullres.jpg		M66 is an "SAB(s)b"
Messier 106	SABbc	File:NGC 4258GALEX.jpg		M106 is an "SAB(s)bc"
Sculptor Galaxy	SABc	File:Ngc253 2mass barred spiral.jpg		Sculptor is an "SAB(s)c"
NGC 2403	SABcd	File:NGC2403 3.6 8.0 24 microns spitzer.png		NGC 2403 is an "SAB(s)cd"
	SABd
	SABdm		SABdm can also be considered a type of intermediate Magellanic spiral
NGC 4625	SABm	File:NGC 4625 I FUV g2006.jpg	SABm is a type of Magellanic spiral (Sm)	NGC 4625 is an "SAB(rs)m pec"
Fireworks Galaxy	SAB(rs)cd	NGC6946 Galaxy from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block		NGC 4625 is an "SAB(rs)cd"

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