How is the redshift parameter ($z$) quantified for an object exhibiting a blueshift?
Answer
The resulting value for $z$ will be negative.
The redshift parameter $z$ is calculated as $(\lambda_{obs} - \lambda_{rest}) / \lambda_{rest}$. Since observed wavelength ($\lambda_{obs}$) is shorter than rest wavelength ($\lambda_{rest}$) for a blue shift, the result is negative.
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