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Siamese Twins (NGC 4567)
NGC 4567, LEDA 42064, MCG+02-32-151, UGC 7777, VV 219a, Siamese Twins, IV 8, h 1358, h 1363, GC 3108
Type: galaxy (HII), Sc
Mag: B=12.13, V=11.34
Size: 3.09′ x 2.63′
PA: 85°
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Photos (1)
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History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 4567. See NGC 4554.
Historical observations
William Herschel (c.1784)
Synonyms: H IV-008
Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a double nebula. The chevelure run into each other, close, not vF." The two objects are NGC 4567 & NGC 4568.
NGC/IC Dreyer (1888, 1895, 1908)
The NGC records it as "very faint, large, N.p. of double neb, pos about 160 ". The companion object is NGC 4568.
Published comments
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads S,HISB,VKN,SLEL, DKLNS,COLLISION W/4568.
Photo index
NGC 4567-68 Siamese Twins, Sky&Tel. 1/65 p10, Sky&Tel. 10/77 p287, Astronomy mag. 3/77 p22, Burnhams V3 p2082.
Modern observations
Hartung, E.J. (1968)
Hartung writes: "Rendered familiar by photographs with large instruments, this pair of galaxies resembles NGC 4038-9 in Corvus, but is fainter. Each nebula is about 1.5' x 1'; they are inclined at 60 to each other and touch the the following ends ... an 8-inch is needed to show them clearly; about 12' north is the small spindle NGC 4564."
Steve Coe
Steve Coe, observing with a 13" f/5.6, notes: "this is one of the most famous galaxy pair, the Siamese Twins. Both are pretty bright, pretty large and elongated 2X1. The northernmost has a much brighter middle. The two galaxies are at approximately a 60 degree angle to each other."
Tom Lorenzin
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 2.4' x 2.6'; faint ellipse with stellar core; contact pair with SP GAL N4568 (11.9M; 3.6' x 2' extent) to SE; faint with bright center; reference BCH-III-2080,82 and VADSS-125; N4564 (12.3M; 3' x 1' extent) 14' to N is NE-SW-oriented slash 9' due E of 8M star, with 13.5M stellar nucleus; good supernova prospect."
Contemporary observations
Richard Ford
2011 April, 30th, Saturday
Location:Perdeberg.
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.
Limiting Magnitude:4.9.
NGC 4567
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Object Type:Galaxy.
First Impression:This object looks like a strange galaxy.
Location:Virgo.
Time:10:00pm.
Chart Number:No.175(Extract taken out of "Star Gazer's Deep Space Atlas").
Size:26mm Super Wide Field Eyepiece:Field Of View:57'/13=4.3'.
20mm Ultra Wide Angle Eyepiece:Field Of View:
50'11.5=4.3'.
4.3'+ 4.3'=8.6'.
8.6'/2=4.3'.
Size in Arc Minutes:4.3'.
Ratio:1:4.
Major Axis:4.3'.
4.3'/4=1'.
Minor Axis:1'.
Galaxy is 4.3'* 1'.
Brightness:Magnitude 11.7'.
Brightness Profile:From the far outskirts of this galaxy to the central nucleus it grows slightly brighter.
Challenge Rating:Very Difficult.
Description
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This galaxy presents a strange irregular shape and is joined to another galaxy.The galactic nucleus of this galaxy is very faint.One has to use averted vision to observe these two galaxies which are joined to each other.Around the outskirts of this galaxy I have found areas of uneven brightness.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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