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Full database:

Entire DOCdb database of 18,816 objects.



NGC 5557 (12,266 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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altitude today

altitude (year)


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NGC 5557

NGC 5557, LEDA 51104, MCG+06-31-093, UGC 9161, I 99, h 1776, GC 3843

RA: 14h 18m 25.8s
Dec: +36° 29′ 35.9″

Con: Bo÷tes
Ch: MSA:627, U2:110, SA:7


(reference key)

Type: galaxy, E

Mag: B=12.2, V=?

Size: 2.344′ x 1.584′
PA: 105°

Historical observations

William Herschel (c.1784)

Synonyms: H I-099

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB, S, R, vsmbM."

Published comments

Burnham's Celestial Handbook

Burnham calls it a 12.6 mag elliptical galaxy in Bootes, measuring 0.9' by 0.8' which is suddenly much brighter in the middle, considerably bright, small and slightly elongated.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads E,R,BM.

Modern observations

Steve Coe

Steve Coe, using a 13" f/5.6, notes: "Pretty bright, pretty large, little elongated 1.5 X 1 in PA 90 and much brighter in the middle with an almost stellar nucleus at 165X."

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.3M; 1.3' diameter; soft round glow with brighter, almost stellar nucleus 5' ESE of an 11M star; 1 degree S and a bit E is 5M SAO 64053; 25' WSW of star is SP GAL N5533 (12M; 2.5'x 1.5' extent)."

Brian Skiff

RC3: V=11.0/12.6

15cm - f, sm br nuc.

- mod br @ 80x w/ br center. 140x: circ or sl oval (elong NE-SW), 1'.5

diam. strong sharp concen to vbr *ar nuc. two m13 *s SE make triangle 5'

on-a-side. BS, 7Jun1991, Anderson Mesa.

25cm - easily seen, circ, broad core fades evenly to edge. 122x: 1' diam.

30cm - mod br, well concen @ 140x, *ar nuc and br core. 220x: br part 30" diam,

halo fairly extensive to 1'.1. br inner region makes nuc occas appear


Contemporary observations

Magda Streicher

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (218x, 346x)

Round in appearance with bright a core, with fuzzy envelope around which is very much surround by nebulosity. In a NW-SE direction and about 2.2' in size.

Tom Bryant

2011 6 7 0:26:48

Observing site: Little Bennett Regional Park

Telescope: C-11

[14h 18m 24s, 36░ 30m 0s] Small, round E? B: E1.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

Named DSOs

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