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Size or extent.
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NGC 6401 dwells 35,000 light-years away from us, and its brightest star meets our eyes at a feeble apparent magnitude of 15.
The sun is the brightest celestial object as seen from Earth, with an apparent magnitude of -26.
What I see diminishes in apparent magnitude as I retreat from it.
3 light years removed from the nearest star with an apparent magnitude greater than that of any one of its resident celebrities, the big-ticket ski resort and up-market, bohemian hideaway owed its reputation to a brand of renegade income that only the glamour professions could provide.
In spite of the large amount of attention given to NGC 7027, it appears that its apparent magnitude is not well known.
Since the observed median apparent magnitude is 14.
These include: time of appearance (UT); apparent magnitude (brightness); type (shower member, or random, 'background' sporadic); constellation in which seen; presence and duration of any persistent train.
The absolute magnitude is defined as the apparent magnitude measured at 10 parsecs from the source.
By Absolute magnitude, astronomers mean the apparent magnitude that a star would have if it was situated a standard distance of 36.
And that's why astronomers measures a star's brightness two ways: by its apparent magnitude (how bright a star looks when seen from Earth) and by its absolute magnitude (how bright a star would look if it were 33 light-years away from Earth).
Books tend to list the apparent magnitude at around 7, suggesting it is an easy object, though for many years it was considered to be quite a tricky test.
The expansion of the Universe adds up to the Euclidean distance, and therefore the apparent magnitude of the source of light is fainter than if no expansion was present.