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 January 2004)
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.

Contribution for 2002 HST Calibration Workshop proceedings available here.

Equations last updated December 20, 2004.

Previous equations:

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) = 0.0021*exp(-0.234*bg)*x/800

Third, recalculate lct using:

lct = lct0 + 0.921*XCTE

Finally, correct for the CTE loss in Y readout:

c1 = 0.0114*(0.670*exp(-0.246*lbg)+0.330*exp(-0.0359*bg))*(1.+0.335*yr-0.0074*yr*yr)*y/800
c2 = 3.55*exp(-0.474*lct)
YCTE (mags) = ln(exp(c1)*(1+c2)-c2)/0.436

Uncertainties of the parameters:

0.0021 +/- 0.0004
0.234 +/- 0.023
0.0114 +/- 0.0008
0.670,0.330 +/- 0.028
0.246 +/- 0.017
0.0359 +/- 0.0056
0.335 +/- 0.006
-0.0074 +/- 0.0009
3.55 +/- 0.30
0.474 +/- 0.015
0.436 +/- 0.013

Note that the background level should equal the true background of the image. For a sky measured near the star, there is usually some starlight in the sky annulus that can cause confusion. For images with roughly constant, low background levels, this can become a major fraction of the measured background.

Also note that the choice of photometry parameters can affect the CTE solution, as CTE loss affects the PSF for very faint sources. The solution here is for the default HSTphot parameters -- a PSF-fit inside a small (3 pixel PC, 2 pixel WFC) aperture. Using smaller apertures appears to increase the X-CTE to approximately 0.022*x/800 (with a minimal background dependence).

Zero Points relative to Holtzman et al. (1995)

GAIN=7 GAIN=14

Filter PC1 WFC2 WFC3 WFC4 PC1 WFC2 WFC3 WFC4

F439W 0.057 +/- 0.009 0.046 +/- 0.004 0.051 +/- 0.005 0.066 +/- 0.004 0.044 +/- 0.002 0.053 +/- 0.001 0.045 +/- 0.001 0.058 +/- 0.001

F555W 0.038 +/- 0.003 0.034 +/- 0.001 0.033 +/- 0.002 0.035 +/- 0.001 0.027 +/- 0.002 0.029 +/- 0.001 0.031 +/- 0.001 0.042 +/- 0.002

F675W 0.034 +/- 0.006 0.040 +/- 0.003 0.031 +/- 0.003 0.046 +/- 0.003 0.025 +/- 0.002 0.043 +/- 0.001 0.034 +/- 0.001 0.034 +/- 0.002

F814W 0.019 +/- 0.002 0.022 +/- 0.001 0.025 +/- 0.003 0.020 +/- 0.001 0.013 +/- 0.002 0.020 +/- 0.001 0.012 +/- 0.001 0.016 +/- 0.001

note: add these values to Holtzman-calibrated magnitudes

	GAIN=7	GAIN=14
Filter	PC1	WFC2	WFC3	WFC4	PC1	WFC2	WFC3	WFC4
F439W	0.057 +/- 0.009	0.046 +/- 0.004	0.051 +/- 0.005	0.066 +/- 0.004	0.044 +/- 0.002	0.053 +/- 0.001	0.045 +/- 0.001	0.058 +/- 0.001
F555W	0.038 +/- 0.003	0.034 +/- 0.001	0.033 +/- 0.002	0.035 +/- 0.001	0.027 +/- 0.002	0.029 +/- 0.001	0.031 +/- 0.001	0.042 +/- 0.002
F675W	0.034 +/- 0.006	0.040 +/- 0.003	0.031 +/- 0.003	0.046 +/- 0.003	0.025 +/- 0.002	0.043 +/- 0.001	0.034 +/- 0.001	0.034 +/- 0.002
F814W	0.019 +/- 0.002	0.022 +/- 0.001	0.025 +/- 0.003	0.020 +/- 0.001	0.013 +/- 0.002	0.020 +/- 0.001	0.012 +/- 0.001	0.016 +/- 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 +/- 0.004

F450W F439W -0.006 +/- 0.003

F467M F439W -0.060 +/- 0.003

F547M F555W -0.006 +/- 0.002

F569W F555W -0.020 +/- 0.003

F606W F555W -0.020 +/- 0.002

F622W F675W -0.004 +/- 0.005

F702W F675W 0.010 +/- 0.002

F785LP F814W 0.006 +/- 0.002

F791W F814W -0.023 +/- 0.005

F850LP F814W 0.005 +/- 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 +/- 0.004
F450W	F439W	-0.006 +/- 0.003
F467M	F439W	-0.060 +/- 0.003
F547M	F555W	-0.006 +/- 0.002
F569W	F555W	-0.020 +/- 0.003
F606W	F555W	-0.020 +/- 0.002
F622W	F675W	-0.004 +/- 0.005
F702W	F675W	0.010 +/- 0.002
F785LP	F814W	0.006 +/- 0.002
F791W	F814W	-0.023 +/- 0.005
F850LP	F814W	0.005 +/- 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 20.991 +/- 0.010 20.990 +/- 0.006 21.002 +/- 0.006 20.987 +/- 0.005

F410M 19.366 +/- 0.010 19.365 +/- 0.006 19.377 +/- 0.006 19.363 +/- 0.005

F439W 20.866 +/- 0.009 20.865 +/- 0.004 20.877 +/- 0.005 20.862 +/- 0.004

F450W 21.962 +/- 0.010 21.961 +/- 0.005 21.973 +/- 0.006 21.959 +/- 0.005

F467M 19.896 +/- 0.010 19.895 +/- 0.005 19.907 +/- 0.006 19.892 +/- 0.005

F547M 21.609 +/- 0.004 21.616 +/- 0.003 21.622 +/- 0.003 21.595 +/- 0.003

F555W 22.501 +/- 0.003 22.508 +/- 0.001 22.514 +/- 0.002 22.487 +/- 0.001

F569W 22.175 +/- 0.004 22.182 +/- 0.003 22.189 +/- 0.004 22.161 +/- 0.003

F606W 22.840 +/- 0.004 22.847 +/- 0.002 22.853 +/- 0.003 22.825 +/- 0.002

F622W 22.311 +/- 0.008 22.328 +/- 0.006 22.326 +/- 0.006 22.312 +/- 0.006

F675W 22.006 +/- 0.006 22.023 +/- 0.003 22.020 +/- 0.003 22.007 +/- 0.003

F702W 22.410 +/- 0.007 22.427 +/- 0.004 22.424 +/- 0.004 22.411 +/- 0.004

F785LP 20.641 +/- 0.003 20.654 +/- 0.003 20.665 +/- 0.004 20.630 +/- 0.003

F791W 21.441 +/- 0.005 21.455 +/- 0.005 21.465 +/- 0.006 21.430 +/- 0.005

F814W 21.597 +/- 0.002 21.610 +/- 0.001 21.620 +/- 0.003 21.585 +/- 0.001

F850LP 19.903 +/- 0.005 19.916 +/- 0.004 19.927 +/- 0.005 19.892 +/- 0.005

F1042M 16.125 +/- 0.002 16.138 +/- 0.001 16.148 +/- 0.003 16.113 +/- 0.001

Filter	PC1	WFC2	WFC3	WFC4
F380W	20.991 +/- 0.010	20.990 +/- 0.006	21.002 +/- 0.006	20.987 +/- 0.005
F410M	19.366 +/- 0.010	19.365 +/- 0.006	19.377 +/- 0.006	19.363 +/- 0.005
F439W	20.866 +/- 0.009	20.865 +/- 0.004	20.877 +/- 0.005	20.862 +/- 0.004
F450W	21.962 +/- 0.010	21.961 +/- 0.005	21.973 +/- 0.006	21.959 +/- 0.005
F467M	19.896 +/- 0.010	19.895 +/- 0.005	19.907 +/- 0.006	19.892 +/- 0.005
F547M	21.609 +/- 0.004	21.616 +/- 0.003	21.622 +/- 0.003	21.595 +/- 0.003
F555W	22.501 +/- 0.003	22.508 +/- 0.001	22.514 +/- 0.002	22.487 +/- 0.001
F569W	22.175 +/- 0.004	22.182 +/- 0.003	22.189 +/- 0.004	22.161 +/- 0.003
F606W	22.840 +/- 0.004	22.847 +/- 0.002	22.853 +/- 0.003	22.825 +/- 0.002
F622W	22.311 +/- 0.008	22.328 +/- 0.006	22.326 +/- 0.006	22.312 +/- 0.006
F675W	22.006 +/- 0.006	22.023 +/- 0.003	22.020 +/- 0.003	22.007 +/- 0.003
F702W	22.410 +/- 0.007	22.427 +/- 0.004	22.424 +/- 0.004	22.411 +/- 0.004
F785LP	20.641 +/- 0.003	20.654 +/- 0.003	20.665 +/- 0.004	20.630 +/- 0.003
F791W	21.441 +/- 0.005	21.455 +/- 0.005	21.465 +/- 0.006	21.430 +/- 0.005
F814W	21.597 +/- 0.002	21.610 +/- 0.001	21.620 +/- 0.003	21.585 +/- 0.001
F850LP	19.903 +/- 0.005	19.916 +/- 0.004	19.927 +/- 0.005	19.892 +/- 0.005
F1042M	16.125 +/- 0.002	16.138 +/- 0.001	16.148 +/- 0.003	16.113 +/- 0.001

GAIN=14 Zero Points for 1 DN/sec

Filter PC1 WFC2 WFC3 WFC4
F380W 20.232 +/- 0.004 20.243 +/- 0.004 20.240 +/- 0.004 20.252 +/- 0.004

F410M 18.607 +/- 0.004 18.618 +/- 0.004 18.615 +/- 0.004 18.627 +/- 0.004

F439W 20.107 +/- 0.002 20.117 +/- 0.001 20.115 +/- 0.001 20.126 +/- 0.001

F450W 21.203 +/- 0.004 21.214 +/- 0.003 21.211 +/- 0.003 21.223 +/- 0.003

F467M 19.137 +/- 0.004 19.148 +/- 0.003 19.145 +/- 0.003 19.157 +/- 0.003

F547M 20.853 +/- 0.003 20.856 +/- 0.003 20.864 +/- 0.003 20.873 +/- 0.003

F555W 21.745 +/- 0.002 21.748 +/- 0.001 21.756 +/- 0.001 21.765 +/- 0.002

F569W 21.420 +/- 0.003 21.423 +/- 0.003 21.431 +/- 0.003 21.440 +/- 0.003

F606W 22.084 +/- 0.002 22.087 +/- 0.002 22.095 +/- 0.002 22.104 +/- 0.002

F622W 21.557 +/- 0.005 21.577 +/- 0.005 21.574 +/- 0.005 21.572 +/- 0.005

F675W 21.252 +/- 0.002 21.272 +/- 0.001 21.268 +/- 0.001 21.267 +/- 0.002

F702W 21.655 +/- 0.003 21.676 +/- 0.003 21.672 +/- 0.003 21.670 +/- 0.003

F785LP 19.889 +/- 0.003 19.898 +/- 0.003 19.895 +/- 0.003 19.898 +/- 0.003

F791W 20.689 +/- 0.005 20.698 +/- 0.005 20.696 +/- 0.005 20.698 +/- 0.005

F814W 20.845 +/- 0.002 20.854 +/- 0.001 20.851 +/- 0.001 20.853 +/- 0.001

F850LP 19.151 +/- 0.005 19.160 +/- 0.004 19.157 +/- 0.005 19.159 +/- 0.005

F1042M 15.373 +/- 0.002 15.382 +/- 0.001 15.379 +/- 0.001 15.381 +/- 0.001

Filter	PC1	WFC2	WFC3	WFC4
F380W	20.232 +/- 0.004	20.243 +/- 0.004	20.240 +/- 0.004	20.252 +/- 0.004
F410M	18.607 +/- 0.004	18.618 +/- 0.004	18.615 +/- 0.004	18.627 +/- 0.004
F439W	20.107 +/- 0.002	20.117 +/- 0.001	20.115 +/- 0.001	20.126 +/- 0.001
F450W	21.203 +/- 0.004	21.214 +/- 0.003	21.211 +/- 0.003	21.223 +/- 0.003
F467M	19.137 +/- 0.004	19.148 +/- 0.003	19.145 +/- 0.003	19.157 +/- 0.003
F547M	20.853 +/- 0.003	20.856 +/- 0.003	20.864 +/- 0.003	20.873 +/- 0.003
F555W	21.745 +/- 0.002	21.748 +/- 0.001	21.756 +/- 0.001	21.765 +/- 0.002
F569W	21.420 +/- 0.003	21.423 +/- 0.003	21.431 +/- 0.003	21.440 +/- 0.003
F606W	22.084 +/- 0.002	22.087 +/- 0.002	22.095 +/- 0.002	22.104 +/- 0.002
F622W	21.557 +/- 0.005	21.577 +/- 0.005	21.574 +/- 0.005	21.572 +/- 0.005
F675W	21.252 +/- 0.002	21.272 +/- 0.001	21.268 +/- 0.001	21.267 +/- 0.002
F702W	21.655 +/- 0.003	21.676 +/- 0.003	21.672 +/- 0.003	21.670 +/- 0.003
F785LP	19.889 +/- 0.003	19.898 +/- 0.003	19.895 +/- 0.003	19.898 +/- 0.003
F791W	20.689 +/- 0.005	20.698 +/- 0.005	20.696 +/- 0.005	20.698 +/- 0.005
F814W	20.845 +/- 0.002	20.854 +/- 0.001	20.851 +/- 0.001	20.853 +/- 0.001
F850LP	19.151 +/- 0.005	19.160 +/- 0.004	19.157 +/- 0.005	19.159 +/- 0.005
F1042M	15.373 +/- 0.002	15.382 +/- 0.001	15.379 +/- 0.001	15.381 +/- 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) 21.016 21.015 21.027 21.012 -0.581 0.777 ... 0.5

F380W B (B-V) 21.368 21.367 21.379 21.364 -0.943 0.103 0.5 ...

F410M B (B-V) 19.676 19.675 19.687 19.673 -0.183 -0.287 ... ...

F439W B (U-B) 20.853 20.852 20.864 20.849 -0.103 -0.046 ... ...

F439W B (B-V) 20.866 20.865 20.877 20.862 0.003 -0.088 ... ...

F439W B (B-R) 20.860 20.859 20.871 20.856 0.019 -0.049 ... ...

F439W B (B-I) 20.863 20.862 20.874 20.859 0.005 -0.023 ... ...

F450W B (B-V) 21.964 21.963 21.975 21.961 0.230 -0.003 ... ...

F467M B (B-V) 19.903 19.902 19.914 19.899 0.480 -0.299 ... 0.5

F467M B (B-V) 19.854 19.853 19.865 19.850 0.432 -0.002 0.5 ...

F547M V (B-V) 21.604 21.611 21.617 21.590 0.031 -0.039 ... 1.0

F547M V (B-V) 21.556 21.563 21.569 21.542 0.056 -0.016 1.0 ...

F547M V (V-I) 21.604 21.611 21.617 21.590 0.027 -0.032 ... 1.1

F547M V (V-I) 21.556 21.563 21.569 21.542 0.049 -0.013 1.1 ...

F555W V (U-V) 22.482 22.489 22.495 22.468 -0.014 0.005 ... ...

F555W V (B-V) 22.501 22.508 22.514 22.487 -0.060 0.033 ... ...

F555W V (V-R) 22.506 22.513 22.519 22.492 -0.121 0.120 ... ...

F555W V (V-I) 22.501 22.508 22.514 22.487 -0.052 0.027 ... ...

F569W V (V-I) 22.173 22.180 22.187 22.159 0.089 -0.003 ... 2.0

F569W V (V-I) 22.505 22.512 22.519 22.491 -0.125 0.022 2.0 ...

F606W V (B-V) 22.849 22.856 22.862 22.834 0.293 0.015 ... 1.7

F606W V (B-V) 23.639 23.646 23.652 23.624 -0.284 0.081 1.7 ...

F606W V (V-I) 22.849 22.856 22.862 22.834 0.254 0.012 ... 2.0

F606W V (V-I) 23.639 23.646 23.652 23.624 -0.247 0.065 2.0 ...

F622W R (V-R) 22.325 22.342 22.340 22.326 -0.252 -0.111 ... ...

F675W R (U-R) 22.026 22.043 22.040 22.027 0.039 -0.007 ... ...

F675W R (B-R) 22.007 22.024 22.021 22.008 0.092 -0.017 ... ...

F675W R (V-R) 22.006 22.023 22.020 22.007 0.253 -0.125 ... ...

F675W R (R-I) 21.997 22.014 22.011 21.998 0.273 -0.066 ... ...

F702W R (V-R) 22.415 22.432 22.429 22.416 0.343 -0.177 ... 0.6

F702W R (V-R) 22.293 22.310 22.307 22.294 0.486 -0.079 0.6 ...

F785LP I (V-I) 20.644 20.657 20.668 20.633 0.091 0.020 ... ...

F791W I (V-I) 21.441 21.455 21.465 21.430 -0.029 -0.004 ... 1.0

F791W I (V-I) 21.482 21.496 21.506 21.471 -0.084 0.011 1.0 ...

F814W I (U-I) 21.573 21.586 21.596 21.561 -0.018 0.002 ... ...

F814W I (B-I) 21.593 21.606 21.616 21.581 -0.031 0.007 ... ...

F814W I (V-I) 21.597 21.610 21.620 21.585 -0.062 0.025 ... ...

F814W I (R-I) 21.597 21.610 21.620 21.585 -0.112 0.084 ... ...

F850LP I (V-I) 19.885 19.898 19.909 19.874 0.160 0.023 ... ...

F1042M I (V-I) 16.072 16.085 16.095 16.060 0.350 0.022 ... ...

Filter	SMAG	SCOL	ZP(PC1)	ZP(WFC2)	ZP(WFC3)	ZP(WFC4)	T1	T2	Cmin	Cmax
F380W	B	(B-V)	21.016	21.015	21.027	21.012	-0.581	0.777	...	0.5
F380W	B	(B-V)	21.368	21.367	21.379	21.364	-0.943	0.103	0.5	...
F410M	B	(B-V)	19.676	19.675	19.687	19.673	-0.183	-0.287	...	...
F439W	B	(U-B)	20.853	20.852	20.864	20.849	-0.103	-0.046	...	...
F439W	B	(B-V)	20.866	20.865	20.877	20.862	0.003	-0.088	...	...
F439W	B	(B-R)	20.860	20.859	20.871	20.856	0.019	-0.049	...	...
F439W	B	(B-I)	20.863	20.862	20.874	20.859	0.005	-0.023	...	...
F450W	B	(B-V)	21.964	21.963	21.975	21.961	0.230	-0.003	...	...
F467M	B	(B-V)	19.903	19.902	19.914	19.899	0.480	-0.299	...	0.5
F467M	B	(B-V)	19.854	19.853	19.865	19.850	0.432	-0.002	0.5	...
F547M	V	(B-V)	21.604	21.611	21.617	21.590	0.031	-0.039	...	1.0
F547M	V	(B-V)	21.556	21.563	21.569	21.542	0.056	-0.016	1.0	...
F547M	V	(V-I)	21.604	21.611	21.617	21.590	0.027	-0.032	...	1.1
F547M	V	(V-I)	21.556	21.563	21.569	21.542	0.049	-0.013	1.1	...
F555W	V	(U-V)	22.482	22.489	22.495	22.468	-0.014	0.005	...	...
F555W	V	(B-V)	22.501	22.508	22.514	22.487	-0.060	0.033	...	...
F555W	V	(V-R)	22.506	22.513	22.519	22.492	-0.121	0.120	...	...
F555W	V	(V-I)	22.501	22.508	22.514	22.487	-0.052	0.027	...	...
F569W	V	(V-I)	22.173	22.180	22.187	22.159	0.089	-0.003	...	2.0
F569W	V	(V-I)	22.505	22.512	22.519	22.491	-0.125	0.022	2.0	...
F606W	V	(B-V)	22.849	22.856	22.862	22.834	0.293	0.015	...	1.7
F606W	V	(B-V)	23.639	23.646	23.652	23.624	-0.284	0.081	1.7	...
F606W	V	(V-I)	22.849	22.856	22.862	22.834	0.254	0.012	...	2.0
F606W	V	(V-I)	23.639	23.646	23.652	23.624	-0.247	0.065	2.0	...
F622W	R	(V-R)	22.325	22.342	22.340	22.326	-0.252	-0.111	...	...
F675W	R	(U-R)	22.026	22.043	22.040	22.027	0.039	-0.007	...	...
F675W	R	(B-R)	22.007	22.024	22.021	22.008	0.092	-0.017	...	...
F675W	R	(V-R)	22.006	22.023	22.020	22.007	0.253	-0.125	...	...
F675W	R	(R-I)	21.997	22.014	22.011	21.998	0.273	-0.066	...	...
F702W	R	(V-R)	22.415	22.432	22.429	22.416	0.343	-0.177	...	0.6
F702W	R	(V-R)	22.293	22.310	22.307	22.294	0.486	-0.079	0.6	...
F785LP	I	(V-I)	20.644	20.657	20.668	20.633	0.091	0.020	...	...
F791W	I	(V-I)	21.441	21.455	21.465	21.430	-0.029	-0.004	...	1.0
F791W	I	(V-I)	21.482	21.496	21.506	21.471	-0.084	0.011	1.0	...
F814W	I	(U-I)	21.573	21.586	21.596	21.561	-0.018	0.002	...	...
F814W	I	(B-I)	21.593	21.606	21.616	21.581	-0.031	0.007	...	...
F814W	I	(V-I)	21.597	21.610	21.620	21.585	-0.062	0.025	...	...
F814W	I	(R-I)	21.597	21.610	21.620	21.585	-0.112	0.084	...	...
F850LP	I	(V-I)	19.885	19.898	19.909	19.874	0.160	0.023	...	...
F1042M	I	(V-I)	16.072	16.085	16.095	16.060	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) 20.257 20.268 20.265 20.277 -0.581 0.777 ... 0.5

F380W B (B-V) 20.609 20.620 20.617 20.629 -0.943 0.103 0.5 ...

F410M B (B-V) 18.917 18.928 18.925 18.937 -0.183 -0.287 ... ...

F439W B (U-B) 20.094 20.104 20.102 20.113 -0.103 -0.046 ... ...

F439W B (B-V) 20.107 20.117 20.115 20.126 0.003 -0.088 ... ...

F439W B (B-R) 20.101 20.111 20.109 20.120 0.019 -0.049 ... ...

F439W B (B-I) 20.104 20.114 20.112 20.123 0.005 -0.023 ... ...

F450W B (B-V) 21.205 21.216 21.213 21.225 0.230 -0.003 ... ...

F467M B (B-V) 19.144 19.155 19.152 19.164 0.480 -0.299 ... 0.5

F467M B (B-V) 19.095 19.106 19.103 19.115 0.432 -0.002 0.5 ...

F547M V (B-V) 20.848 20.851 20.859 20.868 0.031 -0.039 ... 1.0

F547M V (B-V) 20.800 20.803 20.811 20.820 0.056 -0.016 1.0 ...

F547M V (V-I) 20.848 20.851 20.859 20.868 0.027 -0.032 ... 1.1

F547M V (V-I) 20.800 20.803 20.811 20.820 0.049 -0.013 1.1 ...

F555W V (U-V) 21.726 21.729 21.737 21.746 -0.014 0.005 ... ...

F555W V (B-V) 21.745 21.748 21.756 21.765 -0.060 0.033 ... ...

F555W V (V-R) 21.750 21.753 21.761 21.770 -0.121 0.120 ... ...

F555W V (V-I) 21.745 21.748 21.756 21.765 -0.052 0.027 ... ...

F569W V (V-I) 21.418 21.421 21.429 21.438 0.089 -0.003 ... 2.0

F569W V (V-I) 21.750 21.753 21.761 21.770 -0.125 0.022 2.0 ...

F606W V (B-V) 22.093 22.096 22.104 22.113 0.293 0.015 ... 1.7

F606W V (B-V) 22.883 22.886 22.894 22.903 -0.284 0.081 1.7 ...

F606W V (V-I) 22.093 22.096 22.104 22.113 0.254 0.012 ... 2.0

F606W V (V-I) 22.883 22.886 22.894 22.903 -0.247 0.065 2.0 ...

F622W R (V-R) 21.571 21.591 21.588 21.586 -0.252 -0.111 ... ...

F675W R (U-R) 21.272 21.292 21.288 21.287 0.039 -0.007 ... ...

F675W R (B-R) 21.253 21.273 21.269 21.268 0.092 -0.017 ... ...

F675W R (V-R) 21.252 21.272 21.268 21.267 0.253 -0.125 ... ...

F675W R (R-I) 21.243 21.263 21.259 21.258 0.273 -0.066 ... ...

F702W R (V-R) 21.660 21.681 21.677 21.675 0.343 -0.177 ... 0.6

F702W R (V-R) 21.538 21.559 21.555 21.553 0.486 -0.079 0.6 ...

F785LP I (V-I) 19.892 19.901 19.898 19.901 0.091 0.020 ... ...

F791W I (V-I) 20.689 20.698 20.696 20.698 -0.029 -0.004 ... 1.0

F791W I (V-I) 20.730 20.739 20.737 20.739 -0.084 0.011 1.0 ...

F814W I (U-I) 20.821 20.830 20.827 20.829 -0.018 0.002 ... ...

F814W I (B-I) 20.841 20.850 20.847 20.849 -0.031 0.007 ... ...

F814W I (V-I) 20.845 20.854 20.851 20.853 -0.062 0.025 ... ...

F814W I (R-I) 20.845 20.854 20.851 20.853 -0.112 0.084 ... ...

F850LP I (V-I) 19.133 19.142 19.139 19.141 0.160 0.023 ... ...

F1042M I (V-I) 15.320 15.329 15.326 15.328 0.350 0.022 ... ...

Filter	SMAG	SCOL	ZP(PC1)	ZP(WFC2)	ZP(WFC3)	ZP(WFC4)	T1	T2	Cmin	Cmax
F380W	B	(B-V)	20.257	20.268	20.265	20.277	-0.581	0.777	...	0.5
F380W	B	(B-V)	20.609	20.620	20.617	20.629	-0.943	0.103	0.5	...
F410M	B	(B-V)	18.917	18.928	18.925	18.937	-0.183	-0.287	...	...
F439W	B	(U-B)	20.094	20.104	20.102	20.113	-0.103	-0.046	...	...
F439W	B	(B-V)	20.107	20.117	20.115	20.126	0.003	-0.088	...	...
F439W	B	(B-R)	20.101	20.111	20.109	20.120	0.019	-0.049	...	...
F439W	B	(B-I)	20.104	20.114	20.112	20.123	0.005	-0.023	...	...
F450W	B	(B-V)	21.205	21.216	21.213	21.225	0.230	-0.003	...	...
F467M	B	(B-V)	19.144	19.155	19.152	19.164	0.480	-0.299	...	0.5
F467M	B	(B-V)	19.095	19.106	19.103	19.115	0.432	-0.002	0.5	...
F547M	V	(B-V)	20.848	20.851	20.859	20.868	0.031	-0.039	...	1.0
F547M	V	(B-V)	20.800	20.803	20.811	20.820	0.056	-0.016	1.0	...
F547M	V	(V-I)	20.848	20.851	20.859	20.868	0.027	-0.032	...	1.1
F547M	V	(V-I)	20.800	20.803	20.811	20.820	0.049	-0.013	1.1	...
F555W	V	(U-V)	21.726	21.729	21.737	21.746	-0.014	0.005	...	...
F555W	V	(B-V)	21.745	21.748	21.756	21.765	-0.060	0.033	...	...
F555W	V	(V-R)	21.750	21.753	21.761	21.770	-0.121	0.120	...	...
F555W	V	(V-I)	21.745	21.748	21.756	21.765	-0.052	0.027	...	...
F569W	V	(V-I)	21.418	21.421	21.429	21.438	0.089	-0.003	...	2.0
F569W	V	(V-I)	21.750	21.753	21.761	21.770	-0.125	0.022	2.0	...
F606W	V	(B-V)	22.093	22.096	22.104	22.113	0.293	0.015	...	1.7
F606W	V	(B-V)	22.883	22.886	22.894	22.903	-0.284	0.081	1.7	...
F606W	V	(V-I)	22.093	22.096	22.104	22.113	0.254	0.012	...	2.0
F606W	V	(V-I)	22.883	22.886	22.894	22.903	-0.247	0.065	2.0	...
F622W	R	(V-R)	21.571	21.591	21.588	21.586	-0.252	-0.111	...	...
F675W	R	(U-R)	21.272	21.292	21.288	21.287	0.039	-0.007	...	...
F675W	R	(B-R)	21.253	21.273	21.269	21.268	0.092	-0.017	...	...
F675W	R	(V-R)	21.252	21.272	21.268	21.267	0.253	-0.125	...	...
F675W	R	(R-I)	21.243	21.263	21.259	21.258	0.273	-0.066	...	...
F702W	R	(V-R)	21.660	21.681	21.677	21.675	0.343	-0.177	...	0.6
F702W	R	(V-R)	21.538	21.559	21.555	21.553	0.486	-0.079	0.6	...
F785LP	I	(V-I)	19.892	19.901	19.898	19.901	0.091	0.020	...	...
F791W	I	(V-I)	20.689	20.698	20.696	20.698	-0.029	-0.004	...	1.0
F791W	I	(V-I)	20.730	20.739	20.737	20.739	-0.084	0.011	1.0	...
F814W	I	(U-I)	20.821	20.830	20.827	20.829	-0.018	0.002	...	...
F814W	I	(B-I)	20.841	20.850	20.847	20.849	-0.031	0.007	...	...
F814W	I	(V-I)	20.845	20.854	20.851	20.853	-0.062	0.025	...	...
F814W	I	(R-I)	20.845	20.854	20.851	20.853	-0.112	0.084	...	...
F850LP	I	(V-I)	19.133	19.142	19.139	19.141	0.160	0.023	...	...
F1042M	I	(V-I)	15.320	15.329	15.326	15.328	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