Program always under further development. GET INVOLVED: Your help with validation encouraged!)
SOME SPECIALIZED TERMINOLOGY:
Average Surface Brightness:
Straight mathematical treatment based on apparent size
and listed magnitude of the object. This is the
mean average luminosity of all 1 "square" arc-minute
regions on the object.
Adjusted Surface Brightness:
Since the luminosity of many deepsky objects tends to
coelesce around certain brighter regions, this is
the expected luminosity of the brightest portions.
(Those parts a small telescope is most likely to reveal.)
Adjusted Surface Brightness at Find Magnification:
The smaller the image size in the eyepiece, the greater
the concentration of light presented to the eye. This
effect is offset however, by the fact that sky
brightness also increases with lower magnification.
Threshold Scope Size:
This is the smallest aperture scope of the pre-selected type
which may just reveal the object at find magnification
to the un-averted eye of an observer who already knows
its exact location.
ASTROMETRICS: DSO Visual Susceptibility Calculator -