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NGC 4921 (Spiral Galaxy)


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NGC 4921
Spiral Galaxy (渦巻銀河)
Gx SBab

別名 (Other names)
PGC 44899, UGC 8134, MCG 5-31-98

明るさ (Brightness)
12.5等級

星座 (Constellation)
かみのけ座 (Com) (Coma Berenices)


距離 (Distance)
3億2,000万光年 (320 million light-years)

NGC 4921 is a spiral galaxy located 320 million light years from the Earth in the constellation Coma Berenices.

NGC 4921 (Spiral Galaxy) : Picture

NGC4921
NGC 4921
(C) NASA
How far away is spiral galaxy NGC 4921? Although presently estimated to be about 320 million light years distant, a more precise determination could be coupled with its known recession speed to help humanity better calibrate the expansion rate of the entire visible universe. Toward this goal, this image was taken by the Hubble Space Telescope in order to help identify key stellar distance markers known as Cepheid variable stars. Since NGC 4921 is a member of the Coma Cluster of Galaxies, refining its distance would also allow a better distance determination to one of the largest nearby clusters in the local universe. The magnificent spiral NGC 4921 has been informally dubbed anemic because of its low rate of star formation and low surface brightness. The remarkably sharp image was made with Hubble's Advanced Camera for Surveys, currently in need of repair. Visible in the image are, from the center, a bright nucleus, a bright central bar, a prominent ring of dark dust, blue clusters of recently formed stars, several smaller companion galaxies, unrelated galaxies in the far distant universe, and unrelated stars in our Milky Way Galaxy.

NGC 4921
Annotated view of NGC 4921
(C) NASA, ESA and K. Cook (Lawrence Livermore National Laboratory, USA)
Very deep NASA/ESA Hubble Space Telescope imaging of NGC 4921 with annotation to indictate the locations of some of the more interesting features of the galaxy and its surroundings.
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NGC 4921 (Spiral Galaxy) : Movie

Hubblecast 26: Exceptionally deep view of strange galaxy
A spectacular new image of an unusual spiral galaxy in the Coma Galaxy Cluster has been created from data taken by the Advanced Camera for Surveys on the NASA/ESA Hubble Space Telescope. It reveals lots of new details of the galaxy, NGC 4921, as well as an extraordinary rich background of more remote galaxies stretching back to the early Universe.
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