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RA: 12h 36m 21.07s
Dec: +25° 59′ 13.5″
Con: Coma Berenices
Ch: MSA:677, U2:149, SA:7
Type: galaxy (AGN LINER-type), Sb
Mag: B=10.3, V=?
Size: 14.79′ x 2.137′
Synonyms: H V-024
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a lucid ray 20' long or more, 3' or 4' broad, N.p.-S.f., vBm, a beautiful appearance."
Sketched and described.
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "long streak with parallel patch on following edge. Extraordinary phenomenon. E. of Rosse, about 15', nucleus projecting into dark lane, sky preceding neb. darker than elsewhere. Very faint 3.7-inch, well seen 9-inch speculum."
(Sulentic and Tifft 1973) notes that this is a 10.5 mag galaxy. Their coded description reads BLGEON,SMNUCBULGE,BM.
Sandage, A. & Tammann, G. A. (1975) Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field. ApJ, 196, 313-328. [1975ApJ...196..313S]
(1975, Astrophysical Journal, 196, 313-328) includes this galaxy in the Coma I Cloud. Members include NGC 4203, NGC 4245, NGC 4251, NGC 4274, NGC 4278, NGC 4283, NGC 4314, NGC 4414, NGC 4448, NGC 4494, NGC 4559, NGC 4565, NGC 4670 & NGC 4725.
This galaxy appears on page 25 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
by Jim Lucyk: Sky&Tel. 1/73 p59, Sky&Tel. 3/83 p262, Sky&Tel. 8/86 p113, Astronomy mag. 1/78 p45, Astronomy mag. 1/84 p14, Astronomy mag. 4/78 p25, Astronomy mag. 5/82 p42, Astronomy mag. 3/88 p75, Deep Sky #10 Sp85 p14, Deep Sky #14 Sp86 p12, Burnhams V2 p687, Burnhams V2 p689, Hubble Atl.of Gal. (Sandage 1961) p25, Sky Catal. 2000 (Vol 2, 1985) pxxxi, Universe Guide to Stars & Planets (Ridpath & Tirion) p116, Galaxies (Hodge,1986) p50, Galaxies (Ferris,1982) p100.
de Vaucouleurs, G. (1975) Nearby groups of galaxies. In: Kuiper, G. (ed) Stars and Stellar Systems. Volume 9: Galaxies and the Universe. Chapter 14, p557.
Coma I Cloud
This is an elliptical area 11°x5° enclosing two main condensations, the denser NGC 4274 group and a loose grouping around NGC 4565. The NGC 4274 group (van den Bergh; Sersic) includes NGC 4245 4251 4274 4278 4283 4314 4414 4448 and possibly 4062 4146 4203 4359 IC3330... The grouping around NGC 4565 includes also NGC 4494 4559 4725 and A1244.
Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part I. M.N.R.A.S., 35(5), 159.
This famous edge-on galaxy in Coma Berenices can be located by first finding 12 and 17 Coma Berenices, which lie in the Coma Star Cluster. The galaxy is then situated to the east, about the same distance as the separation of the two stars. It has been seen with a 10x50 binocular, and with a reasonably clear sky is easy with a 3-inch. An 8-inch reflector at 116x shows only the brighter field stars, and resembles the appearance in photographs. On very clear nights, an 8-inch just gives an impression of the dark, obscuring lane.
writes: "NGC 4565 is certainly one of the showpiece objects in the spring sky. At magnitude 9.5 and half a Moon's breadth long, it is an edge-on spiral that appears as a striking spike of light in just about any amateur telescope."
Notes that "the unmistakablly thin, edge-on shape is 16' x 3' with a 13th magnitude star visible just above the nuclear area. The dark dust lane is only really apparent where it crosses the nuclear bulge."
writes: "I can trace this object for 12' x 1' and the absorption lane is prominent, as well as the faint nebulosity outside it near the bright centre. This is just visible with 20cm while 10.5cm will show the nebula as a faint extended haze."
(e-mail: firstname.lastname@example.org, web: http://www.geocities.com/CapeCanaveral/3693/)
Instrument: 25-inch Dobsonian reflector Location: Mt. Pinos, California, US
Light pollution: none Transparency: excellent Seeing: excellent
Time: Sat Jun 7 10:00:00 1997 UT Obs. no.: 146
A beautiful, huge edge on galaxy. Through the 25" and the 10" SCT, I could EASILY pick out the dark dust lanes in the galaxy. The galaxy took up the entire field of the Neglar eyepiece. A first time observation of this great galaxy for me. I will never forget it and can't wait to see it again. This is a must see under medium power in clear, dark skies. Blown away
Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10.5M; 15' x 1' extent; very large, silver slash with thin, distinct dust lane passing just NE of 13M stellar core! axis oriented NW-SE; one of the finest edge-on spirals! 13M star 1' NE of core; 13M star 3' SSW of core; see photo at HAG-25 !good supernova prospect! a gaggle of smaller, fainter galaxies lie off the NW tip within 0.5 degree and stretching N-ward, including N4565b, N4565c and N4555."
:"Palomar has a famous picture of this edge on spiral, and NGC 4565 is probably the largest example of an edge on spiral. It can be found 3 degrees from 17 Comae and less than 3 degrees from the North Galatic Pole. The image is good in small telescopes of 6 inches or more."
POSS: m13.5 * 1'.65 SE; m14 * 3'.6 SSW. * in string (1989 15cm obs) at 8'.25 radius, implies halo 16'.5x1'.65; core 3'.3x0'.55.
Hanes+: * N V=13.5.
T&B: * N V=13.8.
Hubble: gx in pa138; * in pa44, another at 4' in pa210.
7cm - vlong mod f spindle in *ry fld @ 30x. 50x: m13.5 * next to core on NE side readily vis. wk-mod even concen in rel f halo, then strong-broad concen in core. no sharp nuc. dk lnae not obvious. BS, 26Apr1993, Anderson Mesa.
15cm - at times of good seeing a 7'x1' streak. mottlilngs were seen giving impression of dk lane. BS sees br spot off center as nuc; and neb patch about 30' W, 1' diam.
- overrated...5' diffuse core. w/averted vis it extends to 15' in dk sky. some impression of sk lane. some *s inv w/gx.
- yowzer! 16' long in pa125. halo has mod broad concen along maj axis up to core, which has mod even concen. core length is 2x distance to m13.5 * NE of nuc bulge. dk lane distinct @ 80x/140x, lies NE of geom center of core. max width approx = distance to m13.5 *. core 1/3 of this (i.e. all S of dk lane). occas vf *ar nuc. NW tip of halo reaches to radius of Nmost * of a string of five *s approx W. m14 * farther S of center than m13.5 *. BS, 29Mar1989, Anderson Mesa.
25cm - 90x: elong SE-NW, 20' long w/averted vis. 180x shows it 1' wide. cen bulge 4'x1'. m12 * NE of core. * suspected embedded on SE edge of core.
30cm - great! crosses 16'.4 fld SE-NW. * to N 1'.5. sharp *-like point on E side of nuc just above dk lane. lane seen easily against nuc on NE edge. dk bar traceable for 2'.5-3'. on NW ~5' from nuc is br patch 1'.2 across; on SE sev sm patches can be seen.
Mullaney calls it a "superb sight on dark nights ... a 9.6 magnitude sliver of light some 16' long, it's easy in a 3-inch refractor at 45x. A dark rift, running lengthwise, cutting it in two, and a pronounced nucleur bulge are both visible in 6- to 8-inch instruments. This is one of the most fascinating galaxies in the heavens - don't overlook it."
12-inch f5 (EP: 26mm SW, 20mm UW, 7mm UW)
Conditions: The most clear sky possible. Dark moon and stars magnitude 6 and fainter are visible with the naked eye. Excellent clean sky, limited star flickering and brilliant objects. Limiting Magnitude: 6.2.
Spiral Galaxy located in Coma Berenices. Bright, well defined. Low surface brightness. Very elongated which appears as a long thin streak of faint light which is spread over a large distance of this galaxy. This galaxy has a prominent dust lane and a bright central nucleus. There are slight darker regions on the outskirts of this galaxy. Areas of uneven brightness are noticeable towards the ends of this galaxy.
Observing site: Pinnacles overlook
[12h 36m 18s, 25° 59m 0s] This superb edge on gives the illusion of having the edges of its spiral arms appear to be spread out, which photos prove does not happen.
Observing site: Pinnacles overlook
[12h 36m 18s, 25° 59m 0s] 80x: A faint but distinct streak, with sharp edges. Bright middle, and the dust lane was barely visible with averted vision
The Messier objects
The Bennett objects
The Caldwell list
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