          Andrew Dolphin
          National Optical Astronomy Observatories
          950 N. Cherry Avenue
          PO Box 26732
          Tucson, AZ 85726

     Phone: (520)318-8503
     Fax: (520)318-8360
     E-mail:dolphin@noao.edu

The information on this page is an update of that presented in Dolphin (2000). The necessitation of the update is for a few reasons:

More recent observations of Omega Cen (through March 2002)
Improved versions of HSTphot to reduce the data
Improved functional forms for the fitting

The limitation of the new calibration equations is that the only consider cold (after April 1994) observations.

Equations last updated May 31, 2002.

Page updated August 19 to add uncertainties of the CTE coefficients. Minor adjustments were also made to the constants, resulting from a slightly improved minimization algorithm. The "simple" CTE formula has been removed since it is not significantly simpler but is less accurate.

CTE Correction

The recommended CTE correction below is more complex than usual CTE equations, to allow for the fact that the star brightness is not constant as it is read out, and therefore that the CTE loss per pixel changes during readout. The recipe for correction is as follows:

First, calculate the following variable values:

lct0 = ln(counts/electrons) - 7
bg = sqrt ( background/electrons^2 + 1 ) - 10
lbg = ln(sqrt ( background/electrons^2 + 1 )) - 1
yr = (MJD - 50193) / 365.25

Second, correct for the CTE loss in X readout:

XCTE (mags) = 0.0202*exp(-0.00082*bg)*x/800

Third, recalculate lct using:

lct = lct0 + 0.921*XCTE

Finally, correct for the CTE loss in Y readout:

c1 = 0.0178*(0.654*exp(-0.403*lbg)+0.346*exp(-0.0156*bg))*(1.+0.253*yr+0.0084*yr*yr)*y/800
c2 = 2.36*exp(-0.518*lct)
YCTE (mags) = ln(exp(c1)*(1+c2)-c2)/0.477

Note that for small corrections (c1<<1), this reduces to YCTE=c1*(1+c2)/0.477, which is nearly identical to the simple correction formula.

Uncertainties of the parameters:

0.0202 +/- 0.0014
0.00082 +/- 0.00032
0.0178 +/- 0.0014
0.654,0.346 +/- 0.029
0.403 +/- 0.016
0.0156 +/- 0.0019
0.253 +/- 0.005
0.0084 +/- 0.0014
2.36 +/- 0.24
0.518 +/- 0.016
0.477 +/- 0.015

Zero Points relative to Holtzman et al. (1995)

GAIN=7 GAIN=14

Filter PC1 WFC2 WFC3 WFC4 PC1 WFC2 WFC3 WFC4

F439W 0.060 +/- 0.010 0.031 +/- 0.004 0.059 +/- 0.004 0.056 +/- 0.004 0.020 +/- 0.003 0.042 +/- 0.002 0.044 +/- 0.002 0.050 +/- 0.002

F555W -0.011 +/- 0.005 0.026 +/- 0.001 0.043 +/- 0.003 0.026 +/- 0.001 0.012 +/- 0.003 0.027 +/- 0.001 0.041 +/- 0.001 0.038 +/- 0.001

F675W 0.021 +/- 0.005 0.036 +/- 0.003 0.032 +/- 0.004 0.030 +/- 0.004 0.001 +/- 0.003 0.043 +/- 0.001 0.044 +/- 0.002 0.026 +/- 0.002

F814W -0.020 +/- 0.003 0.013 +/- 0.001 0.024 +/- 0.004 0.009 +/- 0.001 0.006 +/- 0.002 0.019 +/- 0.001 0.018 +/- 0.001 0.015 +/- 0.001

note: add these values to Holtzman-calibrated magnitudes

	GAIN=7	GAIN=14
Filter	PC1	WFC2	WFC3	WFC4	PC1	WFC2	WFC3	WFC4
F439W	0.060 +/- 0.010	0.031 +/- 0.004	0.059 +/- 0.004	0.056 +/- 0.004	0.020 +/- 0.003	0.042 +/- 0.002	0.044 +/- 0.002	0.050 +/- 0.002
F555W	-0.011 +/- 0.005	0.026 +/- 0.001	0.043 +/- 0.003	0.026 +/- 0.001	0.012 +/- 0.003	0.027 +/- 0.001	0.041 +/- 0.001	0.038 +/- 0.001
F675W	0.021 +/- 0.005	0.036 +/- 0.003	0.032 +/- 0.004	0.030 +/- 0.004	0.001 +/- 0.003	0.043 +/- 0.001	0.044 +/- 0.002	0.026 +/- 0.002
F814W	-0.020 +/- 0.003	0.013 +/- 0.001	0.024 +/- 0.004	0.009 +/- 0.001	0.006 +/- 0.002	0.019 +/- 0.001	0.018 +/- 0.001	0.015 +/- 0.001

Additional Offsets for Non-Standard Filters

Filter Std Filt offset

F300W F336W -0.000 +/- 0.000

F380W F439W 0.076 +/- 0.004

F410M F439W 0.066 +/- 0.003

F450W F439W -0.002 +/- 0.005

F467M F439W -0.061 +/- 0.004

F547M F555W -0.010 +/- 0.003

F569W F555W -0.021 +/- 0.003

F606W F555W -0.023 +/- 0.002

F622W F675W -0.015 +/- 0.006

F702W F675W 0.003 +/- 0.003

F785LP F814W -0.002 +/- 0.003

F791W F814W -0.031 +/- 0.005

F850LP F814W 0.000 +/- 0.004

F1042M F814W -0.000 +/- 0.000

note: add these values plus the corresponding calibration from the standard filter table to Holtzman-calibrated magnitudes

Filter	Std Filt	offset
F300W	F336W	-0.000 +/- 0.000
F380W	F439W	0.076 +/- 0.004
F410M	F439W	0.066 +/- 0.003
F450W	F439W	-0.002 +/- 0.005
F467M	F439W	-0.061 +/- 0.004
F547M	F555W	-0.010 +/- 0.003
F569W	F555W	-0.021 +/- 0.003
F606W	F555W	-0.023 +/- 0.002
F622W	F675W	-0.015 +/- 0.006
F702W	F675W	0.003 +/- 0.003
F785LP	F814W	-0.002 +/- 0.003
F791W	F814W	-0.031 +/- 0.005
F850LP	F814W	0.000 +/- 0.004
F1042M	F814W	-0.000 +/- 0.000

WFPC2 Instrumental Magnitudes

GAIN=7 Zero Points for 1 DN/sec

Filter PC1 WFC2 WFC3 WFC4
F380W 20.993 +/- 0.010 20.975 +/- 0.005 21.009 +/- 0.005 20.977 +/- 0.006

F410M 19.369 +/- 0.010 19.351 +/- 0.005 19.386 +/- 0.005 19.354 +/- 0.005

F439W 20.868 +/- 0.010 20.850 +/- 0.004 20.885 +/- 0.004 20.853 +/- 0.004

F450W 21.969 +/- 0.011 21.951 +/- 0.007 21.985 +/- 0.007 21.953 +/- 0.007

F467M 19.897 +/- 0.011 19.879 +/- 0.006 19.914 +/- 0.006 19.882 +/- 0.006

F547M 21.556 +/- 0.005 21.603 +/- 0.003 21.628 +/- 0.004 21.581 +/- 0.003

F555W 22.452 +/- 0.005 22.499 +/- 0.001 22.524 +/- 0.003 22.477 +/- 0.001

F569W 22.125 +/- 0.005 22.173 +/- 0.003 22.197 +/- 0.004 22.151 +/- 0.003

F606W 22.788 +/- 0.005 22.835 +/- 0.002 22.860 +/- 0.004 22.814 +/- 0.002

F622W 22.287 +/- 0.008 22.313 +/- 0.007 22.316 +/- 0.007 22.284 +/- 0.007

F675W 21.993 +/- 0.005 22.019 +/- 0.003 22.022 +/- 0.004 21.991 +/- 0.004

F702W 22.390 +/- 0.006 22.416 +/- 0.004 22.419 +/- 0.005 22.388 +/- 0.005

F785LP 20.593 +/- 0.004 20.637 +/- 0.003 20.655 +/- 0.005 20.611 +/- 0.003

F791W 21.394 +/- 0.006 21.438 +/- 0.005 21.456 +/- 0.006 21.412 +/- 0.005

F814W 21.557 +/- 0.003 21.601 +/- 0.001 21.619 +/- 0.004 21.575 +/- 0.001

F850LP 19.858 +/- 0.005 19.902 +/- 0.005 19.920 +/- 0.006 19.876 +/- 0.005

F1042M 16.085 +/- 0.003 16.129 +/- 0.001 16.147 +/- 0.004 16.103 +/- 0.001

Filter	PC1	WFC2	WFC3	WFC4
F380W	20.993 +/- 0.010	20.975 +/- 0.005	21.009 +/- 0.005	20.977 +/- 0.006
F410M	19.369 +/- 0.010	19.351 +/- 0.005	19.386 +/- 0.005	19.354 +/- 0.005
F439W	20.868 +/- 0.010	20.850 +/- 0.004	20.885 +/- 0.004	20.853 +/- 0.004
F450W	21.969 +/- 0.011	21.951 +/- 0.007	21.985 +/- 0.007	21.953 +/- 0.007
F467M	19.897 +/- 0.011	19.879 +/- 0.006	19.914 +/- 0.006	19.882 +/- 0.006
F547M	21.556 +/- 0.005	21.603 +/- 0.003	21.628 +/- 0.004	21.581 +/- 0.003
F555W	22.452 +/- 0.005	22.499 +/- 0.001	22.524 +/- 0.003	22.477 +/- 0.001
F569W	22.125 +/- 0.005	22.173 +/- 0.003	22.197 +/- 0.004	22.151 +/- 0.003
F606W	22.788 +/- 0.005	22.835 +/- 0.002	22.860 +/- 0.004	22.814 +/- 0.002
F622W	22.287 +/- 0.008	22.313 +/- 0.007	22.316 +/- 0.007	22.284 +/- 0.007
F675W	21.993 +/- 0.005	22.019 +/- 0.003	22.022 +/- 0.004	21.991 +/- 0.004
F702W	22.390 +/- 0.006	22.416 +/- 0.004	22.419 +/- 0.005	22.388 +/- 0.005
F785LP	20.593 +/- 0.004	20.637 +/- 0.003	20.655 +/- 0.005	20.611 +/- 0.003
F791W	21.394 +/- 0.006	21.438 +/- 0.005	21.456 +/- 0.006	21.412 +/- 0.005
F814W	21.557 +/- 0.003	21.601 +/- 0.001	21.619 +/- 0.004	21.575 +/- 0.001
F850LP	19.858 +/- 0.005	19.902 +/- 0.005	19.920 +/- 0.006	19.876 +/- 0.005
F1042M	16.085 +/- 0.003	16.129 +/- 0.001	16.147 +/- 0.004	16.103 +/- 0.001

GAIN=14 Zero Points for 1 DN/sec

Filter PC1 WFC2 WFC3 WFC4
F380W 20.208 +/- 0.005 20.231 +/- 0.004 20.239 +/- 0.004 20.244 +/- 0.004

F410M 18.584 +/- 0.004 18.607 +/- 0.003 18.615 +/- 0.004 18.620 +/- 0.004

F439W 20.083 +/- 0.003 20.106 +/- 0.002 20.114 +/- 0.002 20.119 +/- 0.002

F450W 21.184 +/- 0.006 21.207 +/- 0.006 21.214 +/- 0.006 21.220 +/- 0.006

F467M 19.112 +/- 0.005 19.135 +/- 0.005 19.143 +/- 0.005 19.148 +/- 0.005

F547M 20.834 +/- 0.004 20.850 +/- 0.003 20.870 +/- 0.003 20.866 +/- 0.003

F555W 21.730 +/- 0.003 21.746 +/- 0.001 21.766 +/- 0.001 21.762 +/- 0.001

F569W 21.403 +/- 0.004 21.420 +/- 0.003 21.439 +/- 0.003 21.435 +/- 0.003

F606W 22.066 +/- 0.004 22.082 +/- 0.003 22.102 +/- 0.003 22.098 +/- 0.003

F622W 21.521 +/- 0.007 21.566 +/- 0.006 21.572 +/- 0.006 21.552 +/- 0.006

F675W 21.227 +/- 0.003 21.272 +/- 0.001 21.278 +/- 0.002 21.258 +/- 0.002

F702W 21.625 +/- 0.004 21.669 +/- 0.003 21.676 +/- 0.003 21.655 +/- 0.003

F785LP 19.874 +/- 0.004 19.889 +/- 0.003 19.894 +/- 0.003 19.889 +/- 0.003

F791W 20.675 +/- 0.006 20.690 +/- 0.005 20.694 +/- 0.005 20.689 +/- 0.005

F814W 20.838 +/- 0.002 20.853 +/- 0.001 20.857 +/- 0.001 20.852 +/- 0.001

F850LP 19.139 +/- 0.005 19.154 +/- 0.005 19.158 +/- 0.005 19.153 +/- 0.005

F1042M 15.366 +/- 0.002 15.381 +/- 0.001 15.385 +/- 0.001 15.380 +/- 0.001

Filter	PC1	WFC2	WFC3	WFC4
F380W	20.208 +/- 0.005	20.231 +/- 0.004	20.239 +/- 0.004	20.244 +/- 0.004
F410M	18.584 +/- 0.004	18.607 +/- 0.003	18.615 +/- 0.004	18.620 +/- 0.004
F439W	20.083 +/- 0.003	20.106 +/- 0.002	20.114 +/- 0.002	20.119 +/- 0.002
F450W	21.184 +/- 0.006	21.207 +/- 0.006	21.214 +/- 0.006	21.220 +/- 0.006
F467M	19.112 +/- 0.005	19.135 +/- 0.005	19.143 +/- 0.005	19.148 +/- 0.005
F547M	20.834 +/- 0.004	20.850 +/- 0.003	20.870 +/- 0.003	20.866 +/- 0.003
F555W	21.730 +/- 0.003	21.746 +/- 0.001	21.766 +/- 0.001	21.762 +/- 0.001
F569W	21.403 +/- 0.004	21.420 +/- 0.003	21.439 +/- 0.003	21.435 +/- 0.003
F606W	22.066 +/- 0.004	22.082 +/- 0.003	22.102 +/- 0.003	22.098 +/- 0.003
F622W	21.521 +/- 0.007	21.566 +/- 0.006	21.572 +/- 0.006	21.552 +/- 0.006
F675W	21.227 +/- 0.003	21.272 +/- 0.001	21.278 +/- 0.002	21.258 +/- 0.002
F702W	21.625 +/- 0.004	21.669 +/- 0.003	21.676 +/- 0.003	21.655 +/- 0.003
F785LP	19.874 +/- 0.004	19.889 +/- 0.003	19.894 +/- 0.003	19.889 +/- 0.003
F791W	20.675 +/- 0.006	20.690 +/- 0.005	20.694 +/- 0.005	20.689 +/- 0.005
F814W	20.838 +/- 0.002	20.853 +/- 0.001	20.857 +/- 0.001	20.852 +/- 0.001
F850LP	19.139 +/- 0.005	19.154 +/- 0.005	19.158 +/- 0.005	19.153 +/- 0.005
F1042M	15.366 +/- 0.002	15.381 +/- 0.001	15.385 +/- 0.001	15.380 +/- 0.001

note: WFPC2mag = -2.5 log (DN/s) + ZP(FG) - CTE
ZP(FG) from above tables
CTE calculated from above equations

UBVRI Transformations

GAIN=7

Filter SMAG SCOL ZP(PC1) ZP(WFC2) ZP(WFC3) ZP(WFC4) T1 T2 Cmin Cmax

F380W B (B-V) 21.018 21.000 21.034 21.002 -0.581 0.777 ... 0.5

F380W B (B-V) 21.370 21.352 21.386 21.354 -0.943 0.103 0.5 ...

F410M B (B-V) 19.679 19.661 19.696 19.664 -0.183 -0.287 ... ...

F439W B (U-B) 20.855 20.837 20.872 20.840 -0.103 -0.046 ... ...

F439W B (B-V) 20.868 20.850 20.885 20.853 0.003 -0.088 ... ...

F439W B (B-R) 20.862 20.844 20.879 20.847 0.019 -0.049 ... ...

F439W B (B-I) 20.865 20.847 20.882 20.850 0.005 -0.023 ... ...

F450W B (B-V) 21.971 21.953 21.987 21.955 0.230 -0.003 ... ...

F467M B (B-V) 19.904 19.886 19.921 19.889 0.480 -0.299 ... 0.5

F467M B (B-V) 19.855 19.837 19.872 19.840 0.432 -0.002 0.5 ...

F547M V (B-V) 21.551 21.598 21.623 21.576 0.031 -0.039 ... 1.0

F547M V (B-V) 21.503 21.550 21.575 21.528 0.056 -0.016 1.0 ...

F547M V (V-I) 21.551 21.598 21.623 21.576 0.027 -0.032 ... 1.1

F547M V (V-I) 21.503 21.550 21.575 21.528 0.049 -0.013 1.1 ...

F555W V (U-V) 22.433 22.480 22.505 22.458 -0.014 0.005 ... ...

F555W V (B-V) 22.452 22.499 22.524 22.477 -0.060 0.033 ... ...

F555W V (V-R) 22.457 22.504 22.529 22.482 -0.121 0.120 ... ...

F555W V (V-I) 22.452 22.499 22.524 22.477 -0.052 0.027 ... ...

F569W V (V-I) 22.123 22.171 22.195 22.149 0.089 -0.003 ... 2.0

F569W V (V-I) 22.455 22.503 22.527 22.481 -0.125 0.022 2.0 ...

F606W V (B-V) 22.797 22.844 22.869 22.823 0.293 0.015 ... 1.7

F606W V (B-V) 23.587 23.634 23.659 23.613 -0.284 0.081 1.7 ...

F606W V (V-I) 22.797 22.844 22.869 22.823 0.254 0.012 ... 2.0

F606W V (V-I) 23.587 23.634 23.659 23.613 -0.247 0.065 2.0 ...

F622W R (V-R) 22.301 22.327 22.330 22.298 -0.252 -0.111 ... ...

F675W R (U-R) 22.013 22.039 22.042 22.011 0.039 -0.007 ... ...

F675W R (B-R) 21.994 22.020 22.023 21.992 0.092 -0.017 ... ...

F675W R (V-R) 21.993 22.019 22.022 21.991 0.253 -0.125 ... ...

F675W R (R-I) 21.984 22.010 22.013 21.982 0.273 -0.066 ... ...

F702W R (V-R) 22.395 22.421 22.424 22.393 0.343 -0.177 ... 0.6

F702W R (V-R) 22.273 22.299 22.302 22.271 0.486 -0.079 0.6 ...

F785LP I (V-I) 20.596 20.640 20.658 20.614 0.091 0.020 ... ...

F791W I (V-I) 21.394 21.438 21.456 21.412 -0.029 -0.004 ... 1.0

F791W I (V-I) 21.435 21.479 21.497 21.453 -0.084 0.011 1.0 ...

F814W I (U-I) 21.533 21.577 21.595 21.551 -0.018 0.002 ... ...

F814W I (B-I) 21.553 21.597 21.615 21.571 -0.031 0.007 ... ...

F814W I (V-I) 21.557 21.601 21.619 21.575 -0.062 0.025 ... ...

F814W I (R-I) 21.557 21.601 21.619 21.575 -0.112 0.084 ... ...

F850LP I (V-I) 19.840 19.884 19.902 19.858 0.160 0.023 ... ...

F1042M I (V-I) 16.032 16.076 16.094 16.050 0.350 0.022 ... ...

Filter	SMAG	SCOL	ZP(PC1)	ZP(WFC2)	ZP(WFC3)	ZP(WFC4)	T1	T2	Cmin	Cmax
F380W	B	(B-V)	21.018	21.000	21.034	21.002	-0.581	0.777	...	0.5
F380W	B	(B-V)	21.370	21.352	21.386	21.354	-0.943	0.103	0.5	...
F410M	B	(B-V)	19.679	19.661	19.696	19.664	-0.183	-0.287	...	...
F439W	B	(U-B)	20.855	20.837	20.872	20.840	-0.103	-0.046	...	...
F439W	B	(B-V)	20.868	20.850	20.885	20.853	0.003	-0.088	...	...
F439W	B	(B-R)	20.862	20.844	20.879	20.847	0.019	-0.049	...	...
F439W	B	(B-I)	20.865	20.847	20.882	20.850	0.005	-0.023	...	...
F450W	B	(B-V)	21.971	21.953	21.987	21.955	0.230	-0.003	...	...
F467M	B	(B-V)	19.904	19.886	19.921	19.889	0.480	-0.299	...	0.5
F467M	B	(B-V)	19.855	19.837	19.872	19.840	0.432	-0.002	0.5	...
F547M	V	(B-V)	21.551	21.598	21.623	21.576	0.031	-0.039	...	1.0
F547M	V	(B-V)	21.503	21.550	21.575	21.528	0.056	-0.016	1.0	...
F547M	V	(V-I)	21.551	21.598	21.623	21.576	0.027	-0.032	...	1.1
F547M	V	(V-I)	21.503	21.550	21.575	21.528	0.049	-0.013	1.1	...
F555W	V	(U-V)	22.433	22.480	22.505	22.458	-0.014	0.005	...	...
F555W	V	(B-V)	22.452	22.499	22.524	22.477	-0.060	0.033	...	...
F555W	V	(V-R)	22.457	22.504	22.529	22.482	-0.121	0.120	...	...
F555W	V	(V-I)	22.452	22.499	22.524	22.477	-0.052	0.027	...	...
F569W	V	(V-I)	22.123	22.171	22.195	22.149	0.089	-0.003	...	2.0
F569W	V	(V-I)	22.455	22.503	22.527	22.481	-0.125	0.022	2.0	...
F606W	V	(B-V)	22.797	22.844	22.869	22.823	0.293	0.015	...	1.7
F606W	V	(B-V)	23.587	23.634	23.659	23.613	-0.284	0.081	1.7	...
F606W	V	(V-I)	22.797	22.844	22.869	22.823	0.254	0.012	...	2.0
F606W	V	(V-I)	23.587	23.634	23.659	23.613	-0.247	0.065	2.0	...
F622W	R	(V-R)	22.301	22.327	22.330	22.298	-0.252	-0.111	...	...
F675W	R	(U-R)	22.013	22.039	22.042	22.011	0.039	-0.007	...	...
F675W	R	(B-R)	21.994	22.020	22.023	21.992	0.092	-0.017	...	...
F675W	R	(V-R)	21.993	22.019	22.022	21.991	0.253	-0.125	...	...
F675W	R	(R-I)	21.984	22.010	22.013	21.982	0.273	-0.066	...	...
F702W	R	(V-R)	22.395	22.421	22.424	22.393	0.343	-0.177	...	0.6
F702W	R	(V-R)	22.273	22.299	22.302	22.271	0.486	-0.079	0.6	...
F785LP	I	(V-I)	20.596	20.640	20.658	20.614	0.091	0.020	...	...
F791W	I	(V-I)	21.394	21.438	21.456	21.412	-0.029	-0.004	...	1.0
F791W	I	(V-I)	21.435	21.479	21.497	21.453	-0.084	0.011	1.0	...
F814W	I	(U-I)	21.533	21.577	21.595	21.551	-0.018	0.002	...	...
F814W	I	(B-I)	21.553	21.597	21.615	21.571	-0.031	0.007	...	...
F814W	I	(V-I)	21.557	21.601	21.619	21.575	-0.062	0.025	...	...
F814W	I	(R-I)	21.557	21.601	21.619	21.575	-0.112	0.084	...	...
F850LP	I	(V-I)	19.840	19.884	19.902	19.858	0.160	0.023	...	...
F1042M	I	(V-I)	16.032	16.076	16.094	16.050	0.350	0.022	...	...

GAIN=14

Filter SMAG SCOL ZP(PC1) ZP(WFC2) ZP(WFC3) ZP(WFC4) T1 T2 Cmin Cmax

F380W B (B-V) 20.233 20.256 20.264 20.269 -0.581 0.777 ... 0.5

F380W B (B-V) 20.585 20.608 20.616 20.621 -0.943 0.103 0.5 ...

F410M B (B-V) 18.894 18.917 18.925 18.930 -0.183 -0.287 ... ...

F439W B (U-B) 20.070 20.093 20.101 20.106 -0.103 -0.046 ... ...

F439W B (B-V) 20.083 20.106 20.114 20.119 0.003 -0.088 ... ...

F439W B (B-R) 20.077 20.100 20.108 20.113 0.019 -0.049 ... ...

F439W B (B-I) 20.080 20.103 20.111 20.116 0.005 -0.023 ... ...

F450W B (B-V) 21.186 21.209 21.216 21.222 0.230 -0.003 ... ...

F467M B (B-V) 19.119 19.142 19.150 19.155 0.480 -0.299 ... 0.5

F467M B (B-V) 19.070 19.093 19.101 19.106 0.432 -0.002 0.5 ...

F547M V (B-V) 20.829 20.845 20.865 20.861 0.031 -0.039 ... 1.0

F547M V (B-V) 20.781 20.797 20.817 20.813 0.056 -0.016 1.0 ...

F547M V (V-I) 20.829 20.845 20.865 20.861 0.027 -0.032 ... 1.1

F547M V (V-I) 20.781 20.797 20.817 20.813 0.049 -0.013 1.1 ...

F555W V (U-V) 21.711 21.727 21.747 21.743 -0.014 0.005 ... ...

F555W V (B-V) 21.730 21.746 21.766 21.762 -0.060 0.033 ... ...

F555W V (V-R) 21.735 21.751 21.771 21.767 -0.121 0.120 ... ...

F555W V (V-I) 21.730 21.746 21.766 21.762 -0.052 0.027 ... ...

F569W V (V-I) 21.401 21.418 21.437 21.433 0.089 -0.003 ... 2.0

F569W V (V-I) 21.733 21.750 21.769 21.765 -0.125 0.022 2.0 ...

F606W V (B-V) 22.075 22.091 22.111 22.107 0.293 0.015 ... 1.7

F606W V (B-V) 22.865 22.881 22.901 22.897 -0.284 0.081 1.7 ...

F606W V (V-I) 22.075 22.091 22.111 22.107 0.254 0.012 ... 2.0

F606W V (V-I) 22.865 22.881 22.901 22.897 -0.247 0.065 2.0 ...

F622W R (V-R) 21.535 21.580 21.586 21.566 -0.252 -0.111 ... ...

F675W R (U-R) 21.247 21.292 21.298 21.278 0.039 -0.007 ... ...

F675W R (B-R) 21.228 21.273 21.279 21.259 0.092 -0.017 ... ...

F675W R (V-R) 21.227 21.272 21.278 21.258 0.253 -0.125 ... ...

F675W R (R-I) 21.218 21.263 21.269 21.249 0.273 -0.066 ... ...

F702W R (V-R) 21.630 21.674 21.681 21.660 0.343 -0.177 ... 0.6

F702W R (V-R) 21.508 21.552 21.559 21.538 0.486 -0.079 0.6 ...

F785LP I (V-I) 19.877 19.892 19.897 19.892 0.091 0.020 ... ...

F791W I (V-I) 20.675 20.690 20.694 20.689 -0.029 -0.004 ... 1.0

F791W I (V-I) 20.716 20.731 20.735 20.730 -0.084 0.011 1.0 ...

F814W I (U-I) 20.814 20.829 20.833 20.828 -0.018 0.002 ... ...

F814W I (B-I) 20.834 20.849 20.853 20.848 -0.031 0.007 ... ...

F814W I (V-I) 20.838 20.853 20.857 20.852 -0.062 0.025 ... ...

F814W I (R-I) 20.838 20.853 20.857 20.852 -0.112 0.084 ... ...

F850LP I (V-I) 19.121 19.136 19.140 19.135 0.160 0.023 ... ...

F1042M I (V-I) 15.313 15.328 15.332 15.327 0.350 0.022 ... ...

Filter	SMAG	SCOL	ZP(PC1)	ZP(WFC2)	ZP(WFC3)	ZP(WFC4)	T1	T2	Cmin	Cmax
F380W	B	(B-V)	20.233	20.256	20.264	20.269	-0.581	0.777	...	0.5
F380W	B	(B-V)	20.585	20.608	20.616	20.621	-0.943	0.103	0.5	...
F410M	B	(B-V)	18.894	18.917	18.925	18.930	-0.183	-0.287	...	...
F439W	B	(U-B)	20.070	20.093	20.101	20.106	-0.103	-0.046	...	...
F439W	B	(B-V)	20.083	20.106	20.114	20.119	0.003	-0.088	...	...
F439W	B	(B-R)	20.077	20.100	20.108	20.113	0.019	-0.049	...	...
F439W	B	(B-I)	20.080	20.103	20.111	20.116	0.005	-0.023	...	...
F450W	B	(B-V)	21.186	21.209	21.216	21.222	0.230	-0.003	...	...
F467M	B	(B-V)	19.119	19.142	19.150	19.155	0.480	-0.299	...	0.5
F467M	B	(B-V)	19.070	19.093	19.101	19.106	0.432	-0.002	0.5	...
F547M	V	(B-V)	20.829	20.845	20.865	20.861	0.031	-0.039	...	1.0
F547M	V	(B-V)	20.781	20.797	20.817	20.813	0.056	-0.016	1.0	...
F547M	V	(V-I)	20.829	20.845	20.865	20.861	0.027	-0.032	...	1.1
F547M	V	(V-I)	20.781	20.797	20.817	20.813	0.049	-0.013	1.1	...
F555W	V	(U-V)	21.711	21.727	21.747	21.743	-0.014	0.005	...	...
F555W	V	(B-V)	21.730	21.746	21.766	21.762	-0.060	0.033	...	...
F555W	V	(V-R)	21.735	21.751	21.771	21.767	-0.121	0.120	...	...
F555W	V	(V-I)	21.730	21.746	21.766	21.762	-0.052	0.027	...	...
F569W	V	(V-I)	21.401	21.418	21.437	21.433	0.089	-0.003	...	2.0
F569W	V	(V-I)	21.733	21.750	21.769	21.765	-0.125	0.022	2.0	...
F606W	V	(B-V)	22.075	22.091	22.111	22.107	0.293	0.015	...	1.7
F606W	V	(B-V)	22.865	22.881	22.901	22.897	-0.284	0.081	1.7	...
F606W	V	(V-I)	22.075	22.091	22.111	22.107	0.254	0.012	...	2.0
F606W	V	(V-I)	22.865	22.881	22.901	22.897	-0.247	0.065	2.0	...
F622W	R	(V-R)	21.535	21.580	21.586	21.566	-0.252	-0.111	...	...
F675W	R	(U-R)	21.247	21.292	21.298	21.278	0.039	-0.007	...	...
F675W	R	(B-R)	21.228	21.273	21.279	21.259	0.092	-0.017	...	...
F675W	R	(V-R)	21.227	21.272	21.278	21.258	0.253	-0.125	...	...
F675W	R	(R-I)	21.218	21.263	21.269	21.249	0.273	-0.066	...	...
F702W	R	(V-R)	21.630	21.674	21.681	21.660	0.343	-0.177	...	0.6
F702W	R	(V-R)	21.508	21.552	21.559	21.538	0.486	-0.079	0.6	...
F785LP	I	(V-I)	19.877	19.892	19.897	19.892	0.091	0.020	...	...
F791W	I	(V-I)	20.675	20.690	20.694	20.689	-0.029	-0.004	...	1.0
F791W	I	(V-I)	20.716	20.731	20.735	20.730	-0.084	0.011	1.0	...
F814W	I	(U-I)	20.814	20.829	20.833	20.828	-0.018	0.002	...	...
F814W	I	(B-I)	20.834	20.849	20.853	20.848	-0.031	0.007	...	...
F814W	I	(V-I)	20.838	20.853	20.857	20.852	-0.062	0.025	...	...
F814W	I	(R-I)	20.838	20.853	20.857	20.852	-0.112	0.084	...	...
F850LP	I	(V-I)	19.121	19.136	19.140	19.135	0.160	0.023	...	...
F1042M	I	(V-I)	15.313	15.328	15.332	15.327	0.350	0.022	...	...

note: SMAG = -2.5 log (DN/s) + ZP(FS) + T1 SCOL + T2 SCOL^2 - CTE
ZP(FS), T1, and T2 from above tables
CTE calculated from above equations

References

"The Charge Transfer Efficiency and Calibration of WFPC2." Dolphin, A. E. PASP, 112, 1397

"WFPC2 Stellar Photometry with HSTphot." Dolphin, A. E. 2000, PASP, 112, 1383