Astrophysics (Index)About

Hoag's Object

(PGC54559)
(peculiar ring galaxy)

Hoag's Object is an unusual ring galaxy. Though it can be classified by appearance as a ring galaxy, it defies the common theories of ring-galaxy formation, suggesting it is different kind of object and its formation remains a topic of interest.

The object was discovered in 1950 by Arthur Hoag, who initially theorized it to be either an odd galaxy or a planetary nebula. It is positioned so we have a face-on view of the ring and Hoag also considered gravitational lensing, i.e., an Einstein ring, which redshift measurements of the center and ring discount.


(galaxy)
Further reading:
http://en.wikipedia.org/wiki/Hoag's_Object
RedshiftParsecs
/Distance
Lightyears
/Lookback Years
  
.045188Mpc613MlyHoag's Object
Coordinates:Hoag's Object
J151714.4+213506

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