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NGC 3686 (7,975 of 18,816)

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NGC 3686

NGC 3686, LEDA 35268, MCG+03-29-051, UGC 6460, III 28, II 160, h 894, GC 2423

RA: 11h 27m 44.06s
Dec: +17° 13′ 25″

Con: Leo
Ch: MSA:704, U2:146, SA:13

Ref: SIMBAD

(reference key)

Type: galaxy, SBb/Sc

Mag: B=11.6, V=?

Size: 3.019′ x 2.344′
PA: 15°

Historical observations

William Herschel (c.1784)

Synonyms: H II-160, H III-028

Discovered on 14 March 1783 by William Herschel with an 18.7-inch f/13 speculum telescope. He logged it as III-28 and described it as "vF, L, r." He observed it again on 17 April 1784, logging it as II-160, the description reading "considerably large, round, very gradually brighter in the middle." Dreyer notes that II-160 = III-28.

Published comments

Sulentic & Tifft (1973)

(Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads SLEL,BM,HISB,KNY COMPLEX INT STR,SSTRSUSP.

Sandage & Tammann (1975)

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]

(Astrophysical Journal, 196, 313-328) includes this galaxy in the Leo Group. Members include NGC 3338, NGC 3351, NGC 3368, NGC 3377, NGC 3379, NGC 3384, NGC 3389, NGC 3412, NGC 3489, NGC 3593, NGC 3596, NGC 3605, NGC 3607, NGC 3608, NGC 3623, NGC 3626, NGC 3627, NGC 3628, NGC 3686 & NGC 3810.

Sandage, A. et al. (1975) Galaxies and the Universe

G. de Vaucouleurs ("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the NGC 3607 group are NGC 3607, NGC 3626, NGC 3686, NGC 3608 & NGC 3684.

Hardcastle, J.A. (1914)

Hardcastle, J.A. (1914) Nebulae seen on the Franklin-Adams plates. MNRAS, 74(8), 699-707. [commentary in Shapley, H. & Ames, A. (1932) A survey of the external galaxies brighter than the thirteenth magnitude.]

Classified as "probably spiral."

Notes: NGC 1784, NGC 2146 and NGC 3686 described as spiral in Lick Obs. Bull. 248.

Modern observations

Tom Lorenzin

Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 2.2' x 1.9' extent; almost, but not quite, round with little brighter center; !good supernova prospect! 15' to SW is faint SP GAL N3684 (12.3M; 1' x 0.5' extent); 30' to SW is faint SP GAL N3681 (12.4M; 1' diameter); 20' to SSE is extremely faint and small SP GAL N3691 (13.5M; 0.5' diameter); great group for larger aperture."

Callender, John (IAAC)

Instrument: 8-inch Dobsonian reflector Location: Carpinteria, CA, USA

Light pollution: light Transparency: fair Seeing: fair

Time: Wed Mar 12 06:10:00 1997 UT Obs. no.: 107

Central glow easy at 49x, with a faint outer halo visible with averted vision.

Instrument: 8-inch Dobsonian reflector Location: Carpinteria, CA, USA

Light pollution: light Transparency: fair Seeing: fair

Time: Wed Mar 12 05:50:00 1997 UT Obs. no.: 103

In field with NGC3684 and NGC3681. All three required careful looking with averted vision at 49x. All three seemed pretty

close in size and brightness, but this one (NGC3686) was the largest and easiest, by just a tad.

Contemporary observations

Tom Bryant

2011 6 3 22:48:48

Observing site: Little Bennett Regional Park

Telescope: C-11

[11h 27m 42s, 17 13m 0s] An elongated smudge. As per the NGC. B: Sc.

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