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Type: galaxy (Seyfert 2), Sab
Mag: B=11.8, V=?
Size: 10.23′ x 4.57′
In the Appendix to the 1912 'Scientific Papers of Sir William Herschel' this object is described as "1784, April 8. pL, with a nucleus, perhaps cometic, but moonlight permits not to give a proper description. 1784, April 17, pretty large."
Listed as No. 76 in Arp's "Atlas of Peculiar Galaxies" (Astrophysical Journal Supplement, vol. 14, 1966.) He remarks "Apparent gap between arm and companion."
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.0 mag galaxy. Their coded description reads S,BM,DKLNS,KNORCOMNP VDIF APPS ENDS OF ARMS.
G. de Vaucouleurs ("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the Virgo I (S) group are NGC 4321, NGC 4501, NGC 4254, NGC 4569 & NGC 4579.
This galaxy appears on page 13 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
"nebula, elongated at 25°, 3'x1'; bright nucleus, spiral?"
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 9' x 3' extent; bright and large oval with much brighter center and stellar core; axis oriented NNE-SSW; see photo at HAG-13; 40' NNE of M-89; good supernova prospect."
Steve Coe, observing with a 13" f/5.6, notes: "(M 90) bright, large, much elongated 3X1, bright middle with a nucleus. At 135X the arms are very mottled and there is a dark marking on the north side. There is a very, very faint , pretty small and round companion on the northeast side on the galaxy."
Instrument:12-inch Dobsonian Reflector Telescope.
Sky Conditions:The fainter parts of the Milky Way are barely visible.
Transparency of the Sky:Haziness only visible on the horizon.
Seeing:Atmosphere stable with little interference.
First Impression:This object looks like a spiral galaxy.
Chart Number:No.173(Extract taken out of "Star Gazer's Deep Space Atlas").
Size:26mm Super Wide Field Eyepiece:Field Of View:57'/5=11.4'.
20mm Ultra Wide Angle Eyepiece:Field Of View:50'/4.5=11.1
Size in Arc Minutes:11.2'.
Galaxy is 11.2'* 2.8'.
Brightness Profile:The central nucleus of this galaxy is brighter compared to the far outskirts of this galaxy.
This galaxy has an elongated shape which is slightly oval with bright spiral arms seen edge on.However the galactic nucleus of this galaxy is bright.
Observing site: Pinnacles overlook
[12h 36m 48s, 13° 10m 0s] An Andromeda like spiral, but much smaller! Bright middle. AKA M90.
The Messier objects
The Bennett objects
The Caldwell list
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