Specifications

78 AUTOSTAR CCD PHOTOMETRY
Figure E-4. ((V – R) – (v – r)
o
) versus (V – R) Plot.
Slope = (1 – 1 / β)
(1 – 1 / β) = [Δ((V – R) – (v – r)
o
)) / Δ(V – R)]
Δ ((V – R) – (v – r)
o
)) / Δ (V – R) = –
0.1400/1.200
(1 – 1 / β) = –0.1167
β = 1 / (1 – (–0.1167))
β = 0.8955
β is (V – R) Color Coefficient
Y-Intercept when MX = 0 is ζ
vr
/ β
Y-Intercept = ζ
vr
/ β
ζ
vr
= β * Y-Intercept
ζ
vr
= 0.1375 * 0.8955
ζ
vr
= 0.1231
ζ
vr
is (V– R) Zero Point