The RI photometric system

Basic Reference

Kron G.E., Smith J.L. 1951, ApJ 113, 324


Magnitudes in the red and infrared spectral regions are tabulated for stars of the Sequence, Harvard Standard Regions C4, C6, and C12, and Kapteyn Selected Areas 51, 57, 61, 64, 68, and 71. The methods employed for calibrating the photoelectric photometer are described in detail. An effort has been made to reduce systematic errors to a minimun. Not less than five stars were measured in cach area. Stars in Areas 57 and 61 were observed to magnitude 16 with the Mount Wilson 100-inch reflector. The limiting magnitudes in the remaining areas are from 8 to 12. The zero point of the new system is fixed by reference to magnitudes on the International System of the Polar Sequence.


Access to the data and references

Asiago Database on Photometric System (ADPS)

Indices and Parameters

V, V-R, R-I, V-I, R, I




Continental Electric CE25A/B
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Last update: 13 September 2002