The relevant analyses are presented by Murthy et al. These different results hang largely on the discrepantly high dark currents in the Murthy et al. data. Since publication of the UVX data, there have been two important and highly relevant additions to our knowledge. First, there is the measurement of the phase function asymmetry parameter in the ultraviolet by Witt et al. The asymmetry parameter characterizes the scattering pattern of the interstellar grains.
Values are widely divergent.
The new observation by Witt et al. is of the nebula NGC 7023. The authors show an ultraviolet photograph, taken using UIT on the Astro mission, that shows the scattered light. Their value for the albedo at 1400 is 0.65. In the light of all the controversy there has been over the value of g, it is important to note that Witt et al. The value therefore should be quite secure.