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== Eccentric orbit ==
In an orbit with eccentricity <math>e</math>, the mass function is given by<ref name="tauris" /><ref name="boffin">{{cite book |last1=Boffin |first1=H. M. J. |editor1-last=Arenou |editor1-first=F. |editor2-last=Hestroffer |editor2-first=D. |title=Proceedings of the workshop "Orbital Couples: Pas de Deux in the Solar System and the Milky Way" |date=2012 |pages=41–44 |chapter=The mass-ratio distribution of spectroscopic binaries |publisher=Observatoire de Paris |isbn=978-2-910015-64-0 |name-list-style=amp|bibcode=2012ocpd.conf...41B }}</ref>
<math display="block">f = \frac{M_2^3 \sin^3 i }{(M_1 + M_2)^2} = \frac{P_\mathrm{orb}\ K^3}{2 \pi G} \left(1 - e^2\right)^{3/2}.</math>
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