NGC 4567 and NGC 4568
The Butterfly Galaxies with NGC 4567 (top) and NGC 4568 (bottom)
Observation data (J2000.0epoch)
Constellation	Virgo
Right ascension	12h 36m 34.3s
Declination	+11° 14′ 17″
Distance	62 Mly (19.1 Mpc)[1]
Apparent magnitude (V)	+10.9
Absolute magnitude (V)	-13.3
Characteristics
Type	SA(rs)bc / SA(rs)bc
Apparent size (V)	4.6′ × 2.1′
Notable features	colliding galaxies
Other designations
NGC 4567/8,UGC 7776/7,PGC 42064/9,VV 219,[2] KPG 347,[3] Butterfly Galaxies,[4] Siamese Twin Galaxies, Siamese Twins Galaxies, Siamese Twins[5][NB 1]

NGC 4567 and NGC 4568 (nicknamed theButterfly Galaxies^[4] orSiamese Twins^{[NB 1][5]}) are a set ofunbarred spiral galaxies about 60 millionlight-years away^[1] in theconstellationVirgo. They were both discovered byWilliam Herschel in 1784. They are part of theVirgo Cluster ofgalaxies.

These galaxies are in the process ofcolliding and merging with each other, as studies of their distributions ofneutral and molecularhydrogen show, with the higheststar-formation activity in the part where they overlap. However, the system is still in an early phase of interaction.^[6] In about 500 million years the galaxies will coalesce into a single elliptical galaxy.^[7]

Foursupernovae have been observed in the Butterfly Galaxies:

• SN 1990B (Type Ib, mag. 16) was discovered bySaul Perlmutter andCarlton Pennypacker on 20 January 1990.^[8][9]
• SN 2004cc (Type Ic, mag. 17.5) was discovered by theLick Observatory Supernova Search (LOSS) on 10 June 2004.^[10][11]
• SN 2020fqv (Type IIb, mag. 19) was discovered by theAutomatic Learning for the Rapid Classification of Events (ALeRCE) on 31 March 2020.^[12]
• SN 2023ijd (Type II, mag. 16.8) was discovered byASAS-SN on 14 May 2023.^[13]

The two galaxies were nicknamed "Siamese Twins" because they appear to be connected. On August 5, 2020, NASA announced that they would not use that nickname in an effort to avoidsystemic discrimination in their terminology.^[14][15]

• Antennae Galaxies
• Eyes Galaxies

Wikimedia Commons has media related toNGC 4567.

Wikimedia Commons has media related toNGC 4568.

• Kopernik Space Images,Spiral Galaxies NGC 4568 and NGC 4567 aka "The Siamese Twins" : Supernova 2004cc, George Normandin (29 June 2004)
• Skyhound,The Siamese Twins
• SIMBAD,VCC 1673 : NGC 4567 -- Galaxy in Pair of Galaxies
• SIMBAD,VCC 1676 : NGC 4568 -- Galaxy in Pair of Galaxies
• NED,VV 219
• NED,NGC 4567
• NED,NGC 4568

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