cusp cap

cusp cap

[′kəsp ‚kap]
(astronomy)
One of the 10 bright areas observed near one of the extremities of the illuminated portion of Venus during the crescent phase.
References in periodicals archive ?
cusp cap became notably larger on some occasions in February and March according to UV images (e.
cusp cap on Feb 11 on the image by Jean-Jacques Poupeau.