NGC 721 is a barred spiral galaxy located in the constellation Andromeda about 250 million light years from the Milky Way. It was discovered by the Prussian astronomer Heinrich d'Arrest in 1862. [5][6][7]

是 仙女座 的一个 星系。 维基共享资源 上的相关多媒体资源： NGC 721 NED – NGC 721 SEDS – NGC 721 SIMBAD – NGC 721 VizieR – NGC 721

2024年5月24日 · NED – NGC 721 SEDS – NGC 721 SIMBAD – NGC 721 VizieR – NGC 721 天文學目錄 NGC天體表 ： NGC 719 - NGC 720 - NGC 721 - NGC 722 - NGC 723 分类 ： 仙女座NGC天体 维基共享资源分类链接由本地定义

NGC 721 is a barred spiral galaxy in the Andromeda constellation. It is about 256 million light-years away from the Milky Way.

NGC 721 is a Spiral Galaxy in the Andromeda constellation. NGC 721 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. Given its B magnitude of 13.8, NGC 721 is visible with the help of a telescope having an aperture of 14 inches (350mm) or more.

NGC 721 is a Barred Spiral Galaxy located in the constellation of Andromeda in the northern hemisphere. NGC 721's distance from Earth is 222,882,222.26 light years.

NGC 721 是仙女座的一个星系。

NGC 721 este o galaxie spirală situată în constelația Andromeda. [5][6][7] A fost descoperită în 27 august 1862 de către Heinrich Louis d'Arrest. [8] Se află la o distanță de 55,98 de megaparseci de Pământ. [9][10]

外部連結 維基共享資源 上有關NGC 721的多媒體資源 NED – NGC 721 SEDS – NGC 721 SIMBAD – NGC 721 VizieR – NGC 721 天文學目錄 NGC天體表： NGC 719 - NGC 720 - NGC 721 - NGC 722 - NGC 723NGC 721 是仙女座的一個星系。

R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 10 arcminutes across.NGC721 (Galaxy)