Below is a chart showing the apparent magnitudes
of the 10 brightest stars (other than the sun) as seen from Earth.
The reason is that the light of a star cluster, nebula, or galaxy usually is spread out, diluting it relative to a pointlike star of the same apparent magnitude
Here Reid is appropriating for his own purposes Berkeley's distinction between tangible and visible magnitude, or as Reid also styles it, real and apparent magnitude
. As Reid develops the distinction, the real magnitude of an object (for example, the edge of a table) is an intrinsic property of it, measured in inches or feet, whereas the apparent magnitude
of an object is a relation between the object and a perceiver, measured by the angle the object subtends at the eye.
Visual interpretation and linear regression analysis of the lightcurve to determine the rate of decay following maximum brightness identifies a number of distinct changes in the rates of decline in the apparent magnitude
of the SN.
Among globular clusters, the brightest stars have about the same luminosity, but their apparent magnitude
largely depends on distance.
Among those profiled areAaAaAeAeAaAeAeA Annie Jump Cannon, who created the Har Classification Scheme that organizes stars by their apparent magnitude
and Sally Ride, the first American woman in space.
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.
Since the observed median apparent magnitude
is 14.2, the star should be 45,000 light years from the sun....
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.
With apparent magnitude
V~ 17.5 at 51AU distance, it is the third brightest member of the Kuiper Belt after Pluto and 2005 FY9 (Makemake).
The connection between colour perception and apparent magnitude
is well illustrated by the following anecdote.