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Topic: Spiral Galaxy M91

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	Spiral (and other Disk) Galaxies
		spiral galaxies often have an ellipsoidally formed "bulge" which may be very luminous (as in case of the Sombrero galaxy M104) or rather inconspicuous; some spirals seem to lack this component at all.
		Spiral galaxies, "normal" and barred, with conspicuous bulges (especially near their center) are classified "Sa" or "SBa", those which have prominent bulges and pronounced arms are clssified "Sb" or "SBb", and those which are dominated by the arms are "Sc" or "SBc".
		Spiral galaxies in Messier's catalog: M31, M33, M51, M58, M61, M63, M64, M65, M66, M74, M77, M81, M83, M88, M90, M91, M94, M95, M96, M98, M99, M100, M101, M104, M106, M108, M109.
	www.seds.org /messier/spir.html (727 words)

	Messier Object 91
		Thus, for a long time, M91 was a missing Messier object, as Messier had determined its position from M89 while he thought it was from M58, as the Texas amateur William C. Williams of Fort Worth has figured out in 1969 (Williams 1969).
		The barred spiral galaxy M91 is an appealing member of the Virgo Cluster of Galaxies.
		The Discovery of Cepheids in the Virgo Cluster Galaxy NGC 4548.
	www.seds.org /messier/m/m091.html (587 words)

	The Milky Way Galaxy
		As a galaxy, the Milky Way is actually a giant, as its mass is probably between 750 billion and one trillion solar masses, and its diameter is about 100,000 light years.
		The Milky Way Galaxy belongs to the Local Group, a smaller group of 3 large and over 30 small galaxies, and is the second largest (after the Andromeda Galaxy M31) but perhaps the most massive member of this group.
		M31, at about 2.9 million light years, is the nearest large galaxy, but a number of faint galaxies are much closer: Many of the dwarf Local Group members are satellites or companions of the Milky Way.
	www.seds.org /messier/more/mw.html (1383 words)

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	More M91
		Barred spiral galaxy M91, a member of the Virgo Cluster of Galaxies, here shown on an image by Greg Bothun of the University of Oregon.
		This galaxy is rather small, about 5 x 5 arcminutes and is another difficult target for a small scope.
		It is a weakly barred galaxy with spiral arms emanating from the ends of the bar.
	www.seds.org /messier/more/m091_more.html (87 words)

	Messier Index
		M31 The Andromeda Galaxy spiral galaxy in Andromeda
		M64 Blackeye galaxy spiral galaxy in Coma Berenices
		M104 The Sombrero Galaxy spiral galaxy in Virgo
	www.seds.org /messier/data3.html (286 words)

	Amateur images of M91 (Site not responding. Last check: 2007-09-22)
		Michael Purcell took this CCD image of M91 from Grove Creek Observatory (GCO) on April 28, 1998 at 22:05 with their Celestron C-14 SC telescope at f/7 and ST-7 CCD camera.
		Barred spiral galaxy M91 in the Virgo Cluster as photographed from the D.
		CCD Image of the Virgo cluster barred spiral galaxy M91 by the University of Arizona Astronomy Club.
	messier.obspm.fr /more/m091_m2.html (97 words)

	Messier Objects by Constellations
		M102 may be NGC 5866 Spindle Galaxy, a lenticular galaxy (type S0_3)
		M81 Bode's Galaxy (nebula) spiral galaxy (type Sb)
		M101 The Pinwheel Galaxy spiral galaxy (type Sc) (M102 may be a Duplication of M101)
	www.seds.org /messier/CONindex2.html (146 words)

	Spiral Galaxy M91 = NGC 4548
		This CCD image shows the bright spiral galaxy M91 (NGC 4548) in Virgo.
		It is notable for its central bar and for the intricate detail of star-forming regions and dust in its spiral arms.
		This image is from a 5-minute blue-light exposure taken during twilight with a Tektronix 2048x2048 CCD at the 2.1-meter telescope of Kitt Peak National Observatory, by Bill Keel and Lisa Frattare.
	crux.astr.ua.edu /gifimages/ngc4548.html (119 words)

	AstroImages.org CCD Images
		Be sure to visit AstroImages.org other astronomy sites!
		Astrophotography - Color images of comets, the Moon, nebulae, galaxies and the Milky Way.
		Each image includes a description of the object, links to further information and how the image was taken.
	www.astroimages.org (226 words)

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