Photometric parallax: Difference between revisions

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'''Photometric parallax''' is a means to infer the distances of [[star]]s using their colours and apparent brightnesses. It was used by the [[Sloan Digital Sky Survey]] to discover the [[Virgo super star cluster]].

Assuming that a star is on the main sequence, the star's [[absolute magnitude]] can be determined based on its color. Once the absolute and [[apparent magnitude]]s are known, the distance to the star can be determined by using the [[distance modulus]]. It does not actually employ any measurements of [[parallax]] and can be considered a misnomer. For evolutionary stages other than the main sequence, an absolute magnitude corresponding to the star's [[luminosity class]] (e.g. supergiant) and [[spectral type]] can be used.

Unlike the [[stellar parallax]] method, the photometric parallax method can be used to estimate the distances of stars over 10 kpc away, at the expense of much more limited accuracy for individual measurements.

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== References ==

* {{cite journal |author=Mario Juric |display-authors=etal |title=The Milky Way Tomography with SDSS |year=2008 |doi=10.1086/523619 |journal=The Astrophysical Journal |volume=673 |issue=2 |pages=864–914 |arxiv=astro-ph/0510520|bibcode=2008ApJ...673..864J |s2cid=11935446 }}

* {{cite journal |bibcode=1991A&A...246..441Z |title=Photometry of yellow semiregular variables - {rho} Cassiopeiae |last1=Zsoldos |first1=E. |last2=Percy |first2=J. R. |journal=Astronomy and Astrophysics |date=1991 |volume=246 |page=441 }}

[[Category:Astrometry]]