Specifications

80 AUTOSTAR CCD PHOTOMETRY
Slope = 1 – 1 / γ)
(1 – 1 / γ) = [Δ((R – I) – (r– i)
o
)) / Δ(R – I)]
Δ((R – I) – (r– i)
o
)) / Δ(R – I) = –0.3200/1.2000
(1 – 1 / γ) = –0.2667
γ = 1 / (1 – 0.2667)
γ = 0.7895
γ is (R – I) Color Coefficient
Y-Intercept when MX = 0 is ζ
ri
/ γ
Y-Intercept = ζ
ri
/ γ
ζ
ri
= γ ∗ Y–Intercept
ζ
ri
= 0.6860 * 0.7895 = 0.5416
ζ
ri
= 0.5416
ζ
ri
is (R – I) Zero Point
Determining ε and ζ
v
Plotting (V – v
o
) versus (B – V) produces the slope which is ε and
the Y–intercept ζ
v
.
Table E-10 lists the data and Figure E-6 shows a plot of the data.
The equations are in the form of an equation for a straight line:
(V – v
o
) = ε * (B – V) + ζ
v
Table E-10. (V – v
o
) versus ε * (B – V) Data.
(V – v
o
)(B – V)
22.1227 –0.0800
22.0211 1.3700
21.9475 0.7840
21.9084 0.4570
21.9054 0.5520
21.9832 0.4480
21.9595 0.5800
21.9493 1.0600