NGC 21 explained

NGC 21
Epoch:	J 2000.0
Constellation Name:	Andromeda
Z:	0.015911^[1]
Dist Ly:	234 ± 29 Mly ^[2]
Type:	SAB(s)bc
Appmag V:	+12.8
Absmag V:	-20.75^[3]
Size V:	1,2′ × 0,59′
Names:	NGC 21, UGC 100, PGC 767.

NGC 21 (also known as NGC 29) is a spiral galaxy in the Andromeda constellation. It was discovered by William Herschel in 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.

External links

• • Wikisky image of NGC 29

Notes and References

1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 0021 . 2010-05-03.
2. Web site: Distance Results for NGC 0021 . NASA/IPAC Extragalactic Database . 2010-05-03.
3. Web site: The galaxy NGC 21.