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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.