How to measure the tangential component of velocity of receding starsor quasars?

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Measuring the tangential component of velocity for receding stars or quasars is challenging. The redshift observed primarily indicates the radial component of velocity. For stars, proper motion can be assessed through methods like comparing images from different times or using high-resolution interferometry. However, measuring the tangential velocity of quasars is currently deemed virtually impossible due to their significant distances. Accurate measurement techniques remain limited for distant celestial objects.
aniketp
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Hi all,
How to measure the tangential component of velocity of receding starsor quasars?
I ask this because i think the velocity determined by observing the red shift will give only the radial component...won't
Thnx for replying...
 
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You can't.
 
For stars their proper motion (not just radial) can be measured a few ways. If they move fast enough, comparing images from different epochs and looking for a change in position works. Interferometry, if high enough resolution, can also be used to measure the proper motion of stars. As for Quasars, I would say with current technology it's virtually impossible as they are much much too far away.
 

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