(Oxford University Press, 2007) Koen, Chris; Marang, F.; Kilkenny, David; Jacobs, C.
Near-infrared photometry of 599 stars is used to calculate transformations from the South
African Astronomical Observatory (SAAO) JHK system to the Two-Micron All-Sky Survey
(2MASS) JHKS system. Both several-term formal regression relations and simplified transformations
are presented. Inverse transformations (i.e. 2MASS to SAAO) are also given. The
presence of non-linearities in some colour terms is highlighted.