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| abstraction > mathematical concept > number > quantity > length > radius > Holmberg radius |
| Holmberg radius comparison table | |||
| Subject | is an instance of | is a kind of | has definition |
|---|---|---|---|
| radius | length | ||
| Holmberg radius | radius | The radius of an external galaxy at which the surface brightness is 26.6 mag arcsec-2. This criterion was developed by Holmberg in 1958 to estimate the actual dimensions of the major and minor axes of a galaxy without regard to its orientation in space. |
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