= Andrea M. Ghez
{c}
{wiki}
= Andrea Ghez
{c}
{synonym}
= A. M. Ghez
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{synonym}
<Andrea M. Ghez> measures stellar <orbits> around the <supermassive black hole> at the center of the <Milky Way>. Her team's Keck observations combined <astrometry> with <radial velocities> for the short-period <star> S0-2.
An angular <orbit> alone leaves a <mass-distance degeneracy of an angular stellar orbit>. Adding <Doppler spectroscopy> supplies a physical <velocity> scale, allowing central <mass> and <Euclidean distance> to be fitted together. Their 2008 analysis inferred roughly four million <solar mass>[solar masses] at a <Euclidean distance> of eight <kiloparsecs>, and examined how source confusion and assumptions about central <motion> affected the result.<Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits by Andrea M. Ghez and others>[Abstract: Keck astrometry and radial velocities, unconstrained orbit and identified systematic limitations]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Andrea%20Ghez%20%28geminiann19004a%29.jpg?width=250]
{title=Portrait of <Andrea M. Ghez>}
{description=International Gemini Observatory/NOIRLab/NSF/AURA; still from Feeling gravity’s pull, a video by Julie Winokur. https://creativecommons.org/licenses/by/4.0/[CC BY 4.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Andrea_Ghez_(geminiann19004a).jpg}
{width=250}
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