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Siamese Twins (NGC 4568)

NGC 4568, LEDA 42069, MCG+02-32-152, UGC 7776, VV 219b, Siamese Twins, IV 9, h 1359, h 1363, GC 3109

RA: 12h 36m 34.39s
Dec: +11° 14′ 18″

Con: Virgo
Ch: MSA:725, U2:194, SA:14

Ref: SIMBAD

(reference key)

Type: galaxy (HII), Sc

Mag: B=12.11, V=11.19

Size: 5.011′ x 2.57′
PA: 23°

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Photos  (1)

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History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 4568. See NGC 4554.

Historical observations

William Herschel (c.1784)

Synonyms: H IV-009

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, S.f. of double neb, pos about 160 ". The companion object is NGC 4567.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads S,HISB,EL,DIFAPP SPR COLLISION W/4567.

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."

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 inteference.

Limiting Magnitude:4.9.

NGC 4568

--------

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 to the central nucleus it grows brighter.

Challenge Rating:Very Difficult.

Description

-----------

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 galaxies which are joined to each other.Around the outskirts of this galaxy I have found areas of uneven brightness.

Tom Bryant

2008-05-04 22:30:00

Observing site: Pinnacles overlook

Telescope: C-8

[12h 36m 36s, 11 14m 0s] A pair of galaxies, with NGC 4567 an arc minute to the north. At 36x, these looked like a single galaxy. They need to be re-examined with higher power.

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