UBVRI system

UBVRI system

[¦yü¦bē¦vē¦är′ī ‚sis·təm]
(astronomy)
An extension of the UBV system through measurements of an object's apparent magnitude with red (R) and near-infrared (I) filters.
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References in periodicals archive ?
Warell and Bergfors (2008) used a CCD camera to measure the brightness of Mercury in the UBVRI system. Their measurements cover solar phase angles between 22[degrees] and 152[degrees].