The NEWSGROUP POST sci.astro
"HUBBLE REVEALS TWO DUST DISKS AROUND NEARBY STAR (STScI-PR06-25)"

prompted a look at this site:

http://www.solstation.com/stars2/beta-pic.htm

and thought it appropriate to the discussion.

It identifies a star 'Beta Pictoris'
'only 20 to 200 million years old at most'
with two dust discs as observed by the Hubble telescope.

*******************
Beta Pictoris is a bluish white main sequence dwarf star of spectral and
luminosity type A5 V, but has been previously classified as A3. It is also
classified as a "shell star" because it is surrounded by a shell of mostly
hydrogen gas. The star may have about 1.75 times Sol's mass, 1.4 times its
diameter, and 8.7 times its luminosity. The star may be as enriched than Sol
with elements heavier than hydrogen ("metallicity"), based on its abundance of
iron (Heap et al, 1995). It appears to be only 20 to 200 million years old at most.
*******************

Much older stars such as our own do not have this dust disc character.

Could it be that the dust particles
(with their large area to mass ratios as compared to planetary objects)
experience the anomalous deceleration in a more pronounced manner than
the Pioneer spacecraft and consequently spin into the star or orbiting planets.
Our solar system is essentially dust free.
Perhaps, it did not have to be that way
but for the anomalous deceleration effect.

No doppler effects are noted from the spinning 'Beta Pictoris' dust disc.
I wonder if such data is obtainable.
Could the dust anomalous deceleration be observed directly
as observed by doppler shift of reflected light
as compared to calculated gravitational trajectory?

Richard