| |
| QC
PLOTS |
| |
CURRENT |
HISTORY |
| zeropoints
U |
 |
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| zeropoints
B |
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| zeropoints
V |
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| zeropoints
R |
|
|
| zeropoints
I |
|
|
| zeropoints
error U |
|
|
| zeropoints
error B |
|
|
| zeropoints
error V |
|
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| zeropoints
error R |
|
|
| zeropoints
error I |
|
|
| QC1
database (advanced users): browse
| plot |
Click on CURRENT
to see the current trending (Health Check).
Click on HISTORY
to see the historical evolution of the trending. |
Photometric zeropoints are calculated
from exposures of selected Stetson
photometric standard star fields that contain also some Landolt stars
(Landolt 1992, AJ 104, 340). Stetson fields are often very
rich of stars and permit an accurate estimate of zeropoints. However the
Stetson catalog is not complete in all bands and in particular U photometry
is missing. For U we compute zeropoints using the Landolt stars present
in the fields, if any.
WARNING: Zeropoints have been computed
using constant extinction coefficients and zero color terms, with the
main purpose of instrument and site performance monitoring. Though they
are reasonably precise, they are not suitable for accurate photometric
calibration.
Standard star fields are de-biased and
flat-fielded using the most recent bias frames and normalized twilight
sky flats. The SExtractor
(Source Extractor) software (see Bertin
& Arnouts 1996, A&A 117,
393) is run on the reduced images to detect standard stars and to extract
their instrumental magnitude ("MAG_BEST" Sextractor parameter). The "MAG_BEST"
estimate is in agreement with the values obtained with fixed aperture
of 10" diameter.
The instrumental magnitude Minstr = -2.5Log(Flux[ADU/sec]),
is then corrected for:
- Airmass
- Colour term: this is based on the
Stetson/Landolt standard colours, not the instrumental colours
- Flux is transformed into [e/sec].
Thus we have:
Minstr_corrected = -2.5*Log(Flux[ADU/sec]
-2.5*Log(CONAD) + col_term*Colour - cext*Airmass
CONAD is the conversion factor ADU to
electrons written in the FITS keyword "HIERARCH ESO DET OUT CONAD". The
typical value for the CONAD, in the low gain mode used for Imaging is
1.8 e/ADU. The difference between the corrected instrumental magnitude
and the magnitude of the Stetson/Landolt standard gives a measure of the
zeropoint (at zero airmass and zero colour). For each night we take the
median of all the calculated star zeropoints
Zp = Mcatalog - Minstr_corrected.
To obtain the zero point in ADU/sec, 2.5*Log(CONAD) simply
needs to be subtracted from the values trended on the Health Check pages.
Pipeline-reduced science
images in U, B, V, R, and I filters are photometrically calibrated: they
contain in header the keyword : "HIERARCH ESO PRO MAG ZERO" that is the
most recent estimate of the zeropoint (Zp) for the filter and quadrant
in ADU/sec. To
convert science images instrumental magnitudes into standard magnitude the
photometric equation is:
magnitude = Minstr_corrected + Zp = -2.5*Log(Flux[ADU/sec]
+ col_term*Colour - cext*Airmass + Zp .
If Zp is in (ADU/sec) like in the reduced
images header, Minstr_corrected should not be corrected for CONAD.
WARNING: Zeropoints have been computed
using constant extinction coefficients and zero color terms, with the
main purpose of instrument and site performance monitoring. Though they
are reasonably precise, they are not suitable for accurate photometric
calibrations.
QC1 parameters
| parameter |
QC1 database: table, name
|
procedure |
| zeropoint |
vimos_zp_night, zeropoint |
average of zeropoints from all individual standard
star fields observed during the night for the specific filter |
Trending
Zeropoints are used to monitor the total
throughput of the telescope and the instrument. For trending, averages
of all fields observed during each night are used. Zeropoints from individual
frames can be obtained via the general QC1
database interface.
History
July 2010: instrument upgrade, new detectors
2010-09: M1 coating
2011-03-01: video board of FIERA A exchanged; gain changed for Q2 and Q3
2011-04-18: gain values for all quadrants adjusted
2012-08: M1 coating
2014-09: M1 washing
2017-04: M1 coating
| top
Colour terms and extinction coefficients |
For daily zeropoint computations, average extinction
coefficients extimated by FORS are used and the colour terms are set to
zero.
Average colour terms and extinction coefficients have been calculated for several observing periods by solving the usual photometric equation:
Mcatalog = 2.5*Log(Flux[e/sec]) - col_term*Colour
+ cext*Airmass +Zp .
In general, a two step approach has been chosen. Since there are only a few nights available with standard star observations at high airmass, these nights have been selected first and the above equation has been solved simultaneously with a bilinear fit for the variables zeropoint, colour term, and extinction coefficient (basically following the aproach of Harris et al. 1981, PASP 93, 507). In a second step, the extinction coefficient from the first step has been taken and the above equation has been solved for zeropoint and colour term only (but for a larger number of nights). Only photometric nights have been selected (see the definition of photometric nights from FORS) and only observations with airmass between 1.0 and 1.1 or between 1.1 and 1.2 have been taken (depending on the availability of data for a given period). Due to the lower number of stars in U band, a higher airmass range of 1.0 to 1.2 has usually been chosen here.
The following tables report the computed
zeropoints, colour terms, and extinction coefficients for different observing periods. Quoted errors are one standard deviation and do not include systematic uncertainties. There is also one table that gives the averages of colour terms and extinction coefficients for the complete reported period (i.e. P71 to P84). The error there is derived as the standard deviation of the values for each period and may give an indication of the systematic uncertainties. These values should not be used for precise photometric analyses.
Please note that new detectors were installed in July 2010 with increased sensitivity in the infrared and less in the ultraviolet.
P87: April 2011 to September 2011
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
25.937 +/- 0.096 |
0.082 +/- 0.017 |
0.346 +/- 0.037 |
87 |
| B |
(B-V) |
28.118 +/- 0.030 |
-0.052 +/- 0.004 |
0.218 +/- 0.005 |
961 |
| V |
(B-V) |
27.754 +/- 0.029 |
-0.019 +/- 0.004 |
0.105 +/- 0.004 |
768 |
| R |
(V-R) |
27.925 +/- 0.030 |
-0.085 +/- 0.005 |
0.070 +/- 0.006 |
1182 |
| I |
(V-I) |
27.493 +/- 0.039 |
0.114 +/- 0.004 |
0.051 +/- 0.006 |
1438 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
25.990 +/- 0.089 |
0.095 +/- 0.014 |
0.346 +/- 0.037 |
85 |
| B |
(B-V) |
28.039 +/- 0.035 |
-0.034 +/- 0.004 |
0.218 +/- 0.005 |
969 |
| V |
(B-V) |
27.793 +/- 0.027 |
-0.021 +/- 0.003 |
0.105 +/- 0.004 |
779 |
| R |
(V-R) |
27.942 +/- 0.038 |
-0.099 +/- 0.006 |
0.070 +/- 0.006 |
1182 |
| I |
(V-I) |
27.553 +/- 0.039 |
0.130 +/- 0.004 |
0.051 +/- 0.006 |
1465 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.075 +/- 0.087 |
0.081 +/- 0.015 |
0.346 +/- 0.037 |
91 |
| B |
(B-V) |
28.023 +/- 0.032 |
-0.069 +/- 0.004 |
0.218 +/- 0.005 |
877 |
| V |
(B-V) |
27.695 +/- 0.032 |
-0.023 +/- 0.004 |
0.105 +/- 0.004 |
703 |
| R |
(V-R) |
27.827 +/- 0.040 |
-0.085 +/- 0.006 |
0.070 +/- 0.006 |
1077 |
| I |
(V-I) |
27.478 +/- 0.045 |
0.137 +/- 0.005 |
0.051 +/- 0.006 |
1407 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.167 +/- 0.095 |
0.106 +/- 0.013 |
0.346 +/- 0.037 |
91 |
| B |
(B-V) |
28.263 +/- 0.038 |
-0.086 +/- 0.005 |
0.218 +/- 0.005 |
966 |
| V |
(B-V) |
27.799 +/- 0.038 |
-0.042 +/- 0.005 |
0.105 +/- 0.004 |
723 |
| R |
(V-R) |
27.969 +/- 0.033 |
-0.093 +/- 0.005 |
0.070 +/- 0.006 |
1139 |
| I |
(V-I) |
27.518 +/- 0.048 |
0.094 +/- 0.005 |
0.051 +/- 0.006 |
1422 |
Averages for P71 to P84:
| Filter |
Quadrant |
Colour |
Colour Term |
Ext. coefficient |
| U |
1 |
(U-B) |
0.059 +/- 0.045 |
0.417 +/- 0.034 |
| U |
2 |
(U-B) |
0.061 +/- 0.041 |
0.417 +/- 0.058 |
| U |
3 |
(U-B) |
0.074 +/- 0.042 |
0.421 +/- 0.034 |
| U |
4 |
(U-B) |
0.065 +/- 0.051 |
0.421 +/- 0.110 |
| B |
1 |
(B-V) |
-0.069 +/- 0.017 |
0.214 +/- 0.028 |
| B |
2 |
(B-V) |
-0.071 +/- 0.014 |
0.211 +/- 0.019 |
| B |
3 |
(B-V) |
-0.084 +/- 0.020 |
0.200 +/- 0.023 |
| B |
4 |
(B-V) |
-0.085 +/- 0.016 |
0.212 +/- 0.019 |
| V |
1 |
(B-V) |
-0.027 +/- 0.019 |
0.118 +/- 0.019 |
| V |
2 |
(B-V) |
-0.028 +/- 0.030 |
0.122 +/- 0.015 |
| V |
3 |
(B-V) |
-0.034 +/- 0.017 |
0.105 +/- 0.019 |
| V |
4 |
(B-V) |
-0.027 +/- 0.012 |
0.120 +/- 0.012 |
| R |
1 |
(V-R) |
-0.125 +/- 0.016 |
0.074 +/- 0.017 |
| R |
2 |
(V-R) |
-0.135 +/- 0.017 |
0.076 +/- 0.012 |
| R |
3 |
(V-R) |
-0.132 +/- 0.025 |
0.068 +/- 0.013 |
| R |
4 |
(V-R) |
-0.111 +/- 0.015 |
0.091 +/- 0.025 |
| I |
1 |
(V-I) |
0.046 +/- 0.028 |
0.041 +/- 0.023 |
| I |
2 |
(V-I) |
0.055 +/- 0.026 |
0.022 +/- 0.010 |
| I |
3 |
(V-I) |
0.048 +/- 0.028 |
0.044 +/- 0.029 |
| I |
4 |
(V-I) |
0.049 +/- 0.022 |
0.040 +/- 0.016 |
P84: October 2009 to March 2010
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.186 +/- 0.101 |
0.077 +/- 0.014 |
0.376 +/- 0.035 |
133 |
| B |
(B-V) |
28.217 +/- 0.067 |
-0.056 +/- 0.005 |
0.238 +/- 0.007 |
2209 |
| V |
(B-V) |
27.857 +/- 0.037 |
-0.014 +/- 0.004 |
0.122 +/- 0.009 |
1123 |
| R |
(V-R) |
27.899 +/- 0.050 |
-0.102 +/- 0.008 |
0.080 +/- 0.007 |
1570 |
| I |
(V-I) |
26.929 +/- 0.047 |
0.049 +/- 0.006 |
0.041 +/- 0.019 |
990 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.340 +/- 0.086 |
0.079 +/- 0.011 |
0.376 +/- 0.035 |
138 |
| B |
(B-V) |
28.045 +/- 0.046 |
-0.073 +/- 0.003 |
0.204 +/- 0.008 |
2032 |
| V |
(B-V) |
27.775 +/- 0.040 |
-0.026 +/- 0.004 |
0.124 +/- 0.010 |
1047 |
| R |
(V-R) |
27.792 +/- 0.044 |
-0.133 +/- 0.006 |
0.068 +/- 0.010 |
1528 |
| I |
(V-I) |
26.881 +/- 0.045 |
0.063 +/- 0.005 |
0.028 +/- 0.014 |
1000 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.256 +/- 0.097 |
0.089 +/- 0.014 |
0.376 +/- 0.035 |
131 |
| B |
(B-V) |
28.091 +/- 0.055 |
-0.075 +/- 0.004 |
0.207 +/- 0.010 |
2233 |
| V |
(B-V) |
27.811 +/- 0.029 |
-0.018 +/- 0.003 |
0.121 +/- 0.008 |
1255 |
| R |
(V-R) |
27.813 +/- 0.039 |
-0.128 +/- 0.006 |
0.078 +/- 0.007 |
1317 |
| I |
(V-I) |
26.903 +/- 0.035 |
0.045 +/- 0.005 |
0.048 +/- 0.009 |
1202 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.335 +/- 0.090 |
0.070 +/- 0.013 |
0.376 +/- 0.035 |
137 |
| B |
(B-V) |
28.239 +/- 0.060 |
-0.081 +/- 0.004 |
0.243 +/- 0.009 |
2226 |
| V |
(B-V) |
27.832 +/- 0.027 |
-0.022 +/- 0.002 |
0.137 +/- 0.008 |
1530 |
| R |
(V-R) |
27.921 +/- 0.049 |
-0.100 +/- 0.008 |
0.124 +/- 0.009 |
1392 |
| I |
(V-I) |
26.960 +/- 0.042 |
0.043 +/- 0.005 |
0.051 +/- 0.021 |
1341 |
P83: April 2009 to September 2009
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.334 +/- 0.081 |
0.082 +/- 0.020 |
0.436 +/- 0.038 |
39 |
| B |
(B-V) |
28.191 +/- 0.045 |
-0.045 +/- 0.005 |
0.228 +/- 0.007 |
500 |
| V |
(B-V) |
27.846 +/- 0.029 |
-0.014 +/- 0.002 |
0.117 +/- 0.004 |
734 |
| R |
(V-R) |
27.925 +/- 0.030 |
-0.134 +/- 0.003 |
0.081 +/- 0.005 |
717 |
| I |
(V-I) |
26.886 +/- 0.033 |
0.104 +/- 0.004 |
0.013 +/- 0.004 |
558 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.390 +/- 0.064 |
0.079 +/- 0.015 |
0.380 +/- 0.031 |
40 |
| B |
(B-V) |
28.015 +/- 0.041 |
-0.053 +/- 0.005 |
0.217 +/- 0.006 |
427 |
| V |
(B-V) |
27.745 +/- 0.036 |
-0.031 +/- 0.003 |
0.107 +/- 0.004 |
687 |
| R |
(V-R) |
27.808 +/- 0.036 |
-0.141 +/- 0.004 |
0.069 +/- 0.004 |
674 |
| I |
(V-I) |
26.835 +/- 0.027 |
0.120 +/- 0.003 |
0.017 +/- 0.004 |
474 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.366 +/- 0.075 |
0.085 +/- 0.019 |
0.410 +/- 0.037 |
38 |
| B |
(B-V) |
28.049 +/- 0.036 |
-0.048 +/- 0.004 |
0.180 +/- 0.014 |
423 |
| V |
(B-V) |
27.811 +/- 0.032 |
-0.038 +/- 0.002 |
0.100 +/- 0.008 |
632 |
| R |
(V-R) |
27.845 +/- 0.036 |
-0.162 +/- 0.004 |
0.071 +/- 0.007 |
601 |
| I |
(V-I) |
26.857 +/- 0.027 |
0.100 +/- 0.003 |
0.013 +/- 0.006 |
446 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.425 +/- 0.072 |
0.101 +/- 0.016 |
0.414 +/- 0.039 |
36 |
| B |
(B-V) |
28.183 +/- 0.035 |
-0.057 +/- 0.004 |
0.211 +/- 0.008 |
466 |
| V |
(B-V) |
27.812 +/- 0.028 |
-0.023 +/- 0.002 |
0.131 +/- 0.005 |
672 |
| R |
(V-R) |
27.919 +/- 0.030 |
-0.128 +/- 0.003 |
0.101 +/- 0.006 |
650 |
| I |
(V-I) |
26.920 +/- 0.026 |
0.106 +/- 0.003 |
0.044 +/- 0.007 |
500 |
P82: November 2008 to March 2009
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.364 +/- 0.095 |
0.027 +/- 0.095 |
0.445 +/- 0.053 |
149 |
| B |
(B-V) |
28.239 +/- 0.051 |
-0.060 +/- 0.003 |
0.225 +/- 0.007 |
3652 |
| V |
(B-V) |
27.900 +/- 0.049 |
-0.030 +/- 0.004 |
0.146 +/- 0.003 |
2053 |
| R |
(V-R) |
27.943 +/- 0.034 |
-0.114 +/- 0.003 |
0.102 +/- 0.005 |
3794 |
| I |
(V-I) |
26.940 +/- 0.038 |
0.074 +/- 0.003 |
0.042 +/- 0.005 |
2803 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.521 +/- 0.104 |
0.025 +/- 0.015 |
0.484 +/- 0.051 |
152 |
| B |
(B-V) |
28.072 +/- 0.048 |
-0.078 +/- 0.003 |
0.211 +/- 0.005 |
3490 |
| V |
(B-V) |
27.804 +/- 0.045 |
-0.033 +/- 0.004 |
0.133 +/- 0.004 |
1737 |
| R |
(V-R) |
27.817 +/- 0.047 |
-0.124 +/- 0.006 |
0.075 +/- 0.006 |
2027 |
| I |
(V-I) |
26.862 +/- 0.039 |
0.084 +/- 0.003 |
0.010 +/- 0.006 |
2646 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.437 +/- 0.149 |
0.086 +/- 0.019 |
0.459 +/- 0.060 |
169 |
| B |
(B-V) |
28.135 +/- 0.050 |
-0.089 +/- 0.003 |
0.200 +/- 0.006 |
4670 |
| V |
(B-V) |
27.842 +/- 0.044 |
-0.037 +/- 0.004 |
0.109 +/- 0.004 |
1723 |
| R |
(V-R) |
27.821 +/- 0.035 |
-0.117 +/- 0.003 |
0.073 +/- 0.005 |
4781 |
| I |
(V-I) |
26.874 +/- 0.035 |
0.071 +/- 0.003 |
0.0 +/- 0.0 |
3723 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.609 +/- 0.107 |
0.001 +/- 0.012 |
0.535 +/- 0.056 |
203 |
| B |
(B-V) |
28.219 +/- 0.049 |
-0.089 +/- 0.003 |
0.192 +/- 0.006 |
5070 |
| V |
(B-V) |
27.825 +/- 0.046 |
-0.028 +/- 0.004 |
0.118 +/- 0.004 |
1795 |
| R |
(V-R) |
27.921 +/- 0.034 |
-0.096 +/- 0.003 |
0.110 +/- 0.005 |
5260 |
| I |
(V-I) |
26.950 +/- 0.038 |
0.072 +/- 0.004 |
0.050 +/- 0.006 |
3828 |
P81: April 2008 to September 2008
Fixed extinction coefficients for U and I.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.313 +/- 0.072 |
0.091 +/- 0.010 |
0.45 |
125 |
| B |
(B-V) |
28.119 +/- 0.042 |
-0.058 +/- 0.006 |
0.184 +/- 0.003 |
259 |
| V |
(B-V) |
27.734 +/- 0.040 |
-0.009 +/- 0.005 |
0.088 +/- 0.003 |
416 |
| R |
(V-R) |
27.817 +/- 0.044 |
-0.152 +/- 0.008 |
0.057 +/- 0.003 |
399 |
| I |
(V-I) |
26.916 +/- 0.033 |
0.013 +/- 0.004 |
0.05 |
454 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.413 +/- 0.070 |
0.096 +/- 0.009 |
0.45 |
122 |
| B |
(B-V) |
27.955 +/- 0.041 |
-0.058 +/- 0.006 |
0.180 +/- 0.003 |
255 |
| V |
(B-V) |
27.685 +/- 0.033 |
-0.023 +/- 0.004 |
0.102 +/- 0.003 |
413 |
| R |
(V-R) |
27.779 +/- 0.039 |
-0.167 +/- 0.007 |
0.087 +/- 0.002 |
438 |
| I |
(V-I) |
26.882 +/- 0.033 |
0.030 +/- 0.004 |
0.05 |
453 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.356 +/- 0.074 |
0.096 +/- 0.010 |
0.45 |
124 |
| B |
(B-V) |
28.046 +/- 0.037 |
-0.061 +/- 0.005 |
0.197 +/- 0.003 |
272 |
| V |
(B-V) |
27.727 +/- 0.032 |
-0.020 +/- 0.004 |
0.097 +/- 0.002 |
404 |
| R |
(V-R) |
27.765 +/- 0.038 |
-0.156 +/- 0.007 |
0.070 +/- 0.002 |
439 |
| I |
(V-I) |
26.883 +/- 0.035 |
0.025 +/- 0.005 |
0.05 |
456 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.421 +/- 0.077 |
0.112 +/- 0.010 |
0.45 |
118 |
| B |
(B-V) |
28.110 +/- 0.030 |
-0.056 +/- 0.004 |
0.192 +/- 0.003 |
257 |
| V |
(B-V) |
27.698 +/- 0.031 |
-0.012 +/- 0.004 |
0.105 +/- 0.002 |
391 |
| R |
(V-R) |
27.799 +/- 0.039 |
-0.134 +/- 0.007 |
0.066 +/- 0.002 |
430 |
| I |
(V-I) |
26.895 +/- 0.033 |
0.025 +/- 0.005 |
0.05 |
295 |
P80: October 2007 to March 2008
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.352 +/- 0.076 |
0.055 +/- 0.012 |
0.45 |
119 |
| B |
(B-V) |
28.210 +/- 0.036 |
-0.051 +/- 0.005 |
0.25 |
998 |
| V |
(B-V) |
27.858 +/- 0.051 |
-0.041 +/- 0.005 |
0.15 |
1214 |
| R |
(V-R) |
27.879 +/- 0.030 |
-0.142 +/- 0.005 |
0.10 |
797 |
| I |
(V-I) |
26.928 +/- 0.042 |
0.010 +/- 0.007 |
0.05 |
845 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.459 +/- 0.072 |
0.047 +/- 0.011 |
0.45 |
126 |
| B |
(B-V) |
28.054 +/- 0.039 |
-0.048 +/- 0.005 |
0.25 |
1111 |
| V |
(B-V) |
27.800 +/- 0.054 |
-0.045 +/- 0.006 |
0.15 |
1275 |
| R |
(V-R) |
27.816 +/- 0.033 |
-0.142 +/- 0.006 |
0.10 |
831 |
| I |
(V-I) |
26.911 +/- 0.048 |
0.043 +/- 0.007 |
0.05 |
1187 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.405 +/- 0.084 |
0.068 +/- 0.012 |
0.45 |
130 |
| B |
(B-V) |
28.134 +/- 0.038 |
-0.055 +/- 0.005 |
0.25 |
1028 |
| V |
(B-V) |
27.849 +/- 0.047 |
-0.054 +/- 0.005 |
0.15 |
1335 |
| R |
(V-R) |
27.831 +/- 0.031 |
-0.146 +/- 0.005 |
0.10 |
960 |
| I |
(V-I) |
26.922 +/- 0.043 |
0.015 +/- 0.007 |
0.05 |
853 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.487 +/- 0.090 |
0.041 +/- 0.012 |
0.45 |
136 |
| B |
(B-V) |
28.225 +/- 0.044 |
-0.070 +/- 0.005 |
0.25 |
1060 |
| V |
(B-V) |
27.813 +/- 0.051 |
-0.042 +/- 0.005 |
0.15 |
1148 |
| R |
(V-R) |
27.859 +/- 0.035 |
-0.119 +/- 0.006 |
0.10 |
979 |
| I |
(V-I) |
26.929 +/- 0.045 |
0.035 +/- 0.008 |
0.05 |
927 |
P79: May 2007 to September 2007
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.383 +/- 0.073 |
0.132 +/- 0.023 |
0.45 |
21 |
| B |
(B-V) |
28.322 +/- 0.030 |
-0.096 +/- 0.007 |
0.25 |
173 |
| V |
(B-V) |
27.952 +/- 0.026 |
-0.062 +/- 0.006 |
0.15 |
212 |
| R |
(V-R) |
27.976 +/- 0.022 |
-0.149 +/- 0.007 |
0.10 |
219 |
| I |
(V-I) |
27.009 +/- 0.022 |
0.047 +/- 0.007 |
0.05 |
77 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.477 +/- 0.068 |
0.126 +/- 0.022 |
0.45 |
21 |
| B |
(B-V) |
28.180 +/- 0.034 |
-0.100 +/- 0.008 |
0.25 |
192 |
| V |
(B-V) |
27.881 +/- 0.022 |
-0.059 +/- 0.005 |
0.15 |
220 |
| R |
(V-R) |
27.909 +/- 0.019 |
-0.141 +/- 0.006 |
0.10 |
224 |
| I |
(V-I) |
27.001 +/- 0.026 |
0.058 +/- 0.008 |
0.05 |
91 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.415 +/- 0.064 |
0.135 +/- 0.021 |
0.45 |
21 |
| B |
(B-V) |
28.240 +/- 0.032 |
-0.085 +/- 0.008 |
0.25 |
201 |
| V |
(B-V) |
27.925 +/- 0.027 |
-0.054 +/- 0.006 |
0.15 |
220 |
| R |
(V-R) |
27.924 +/- 0.019 |
-0.156 +/- 0.006 |
0.10 |
226 |
| I |
(V-I) |
26.993 +/- 0.019 |
0.044 +/- 0.006 |
0.05 |
86 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.488 +/- 0.071 |
0.137 +/- 0.023 |
0.45 |
21 |
| B |
(B-V) |
28.310 +/- 0.022 |
-0.089 +/- 0.006 |
0.25 |
183 |
| V |
(B-V) |
27.882 +/- 0.018 |
-0.037 +/- 0.004 |
0.15 |
198 |
| R |
(V-R) |
27.950 +/- 0.019 |
-0.120 +/- 0.006 |
0.10 |
213 |
| I |
(V-I) |
27.027 +/- 0.020 |
0.051 +/- 0.007 |
0.05 |
74 |
P78: October 2006 to March 2007
Fixed extinction coefficients for U and I.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.232 +/- 0.078 |
0.065 +/- 0.016 |
0.45 |
52 |
| B |
(B-V) |
28.069 +/- 0.036 |
-0.050 +/- 0.006 |
0.175 +/- 0.007 |
551 |
| V |
(B-V) |
27.722 +/- 0.037 |
0.015 +/- 0.004 |
0.114 +/- 0.005 |
1238 |
| R |
(V-R) |
27.776 +/- 0.032 |
-0.109 +/- 0.010 |
0.059 +/- 0.004 |
199 |
| I |
(V-I) |
26.876 +/- 0.033 |
0.086 +/- 0.007 |
0.05 |
679 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.336 +/- 0.077 |
0.077 +/- 0.014 |
0.45 |
58 |
| B |
(B-V) |
28.005 +/- 0.063 |
-0.063 +/- 0.012 |
0.212 +/- 0.006 |
401 |
| V |
(B-V) |
27.647 +/- 0.061 |
0.065 +/- 0.006 |
0.142 +/- 0.005 |
1186 |
| R |
(V-R) |
27.718 +/- 0.038 |
-0.089 +/- 0.010 |
0.093 +/- 0.004 |
309 |
| I |
(V-I) |
26.893 +/- 0.045 |
0.071 +/- 0.013 |
0.05 |
405 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.287 +/- 0.111 |
0.071 +/- 0.021 |
0.45 |
65 |
| B |
(B-V) |
28.013 +/- 0.037 |
-0.090 +/- 0.006 |
0.177 +/- 0.010 |
621 |
| V |
(B-V) |
27.659 +/- 0.035 |
0.004 +/- 0.003 |
0.075 +/- 0.006 |
1450 |
| R |
(V-R) |
27.668 +/- 0.025 |
-0.092 +/- 0.007 |
0.041 +/- 0.009 |
329 |
| I |
(V-I) |
26.841 +/- 0.024 |
0.077 +/- 0.006 |
0.05 |
560 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.351 +/- 0.081 |
0.063 +/- 0.017 |
0.45 |
53 |
| B |
(B-V) |
28.159 +/- 0.039 |
-0.103 +/- 0.005 |
0.214 +/- 0.005 |
832 |
| V |
(B-V) |
27.713 +/- 0.039 |
-0.008 +/- 0.003 |
0.116 +/- 0.005 |
1675 |
| R |
(V-R) |
27.781 +/- 0.036 |
-0.102 +/- 0.011 |
0.084 +/- 0.005 |
196 |
| I |
(V-I) |
26.883 +/- 0.041 |
0.073 +/- 0.008 |
0.05 |
967 |
P77: April 2006 to September 2006
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.283 +/- 0.068 |
0.107 +/- 0.017 |
0.45 |
42 |
| B |
(B-V) |
28.281 +/- 0.029 |
-0.063 +/- 0.007 |
0.25 |
215 |
| V |
(B-V) |
27.922 +/- 0.021 |
-0.049 +/- 0.005 |
0.15 |
251 |
| R |
(V-R) |
27.913 +/- 0.027 |
-0.120 +/- 0.010 |
0.10 |
247 |
| I |
(V-I) |
26.989 +/- 0.021 |
0.020 +/- 0.007 |
0.05 |
103 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.407 +/- 0.067 |
0.107 +/- 0.016 |
0.45 |
44 |
| B |
(B-V) |
28.194 +/- 0.037 |
-0.076 +/- 0.009 |
0.25 |
239 |
| V |
(B-V) |
27.896 +/- 0.026 |
-0.059 +/- 0.006 |
0.15 |
255 |
| R |
(V-R) |
27.878 +/- 0.025 |
-0.142 +/- 0.009 |
0.10 |
251 |
| I |
(V-I) |
26.973 +/- 0.038 |
0.012 +/- 0.013 |
0.05 |
108 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.336 +/- 0.075 |
0.103 +/- 0.018 |
0.45 |
40 |
| B |
(B-V) |
28.183 +/- 0.040 |
-0.083 +/- 0.009 |
0.25 |
255 |
| V |
(B-V) |
27.845 +/- 0.030 |
-0.034 +/- 0.009 |
0.15 |
120 |
| R |
(V-R) |
27.822 +/- 0.028 |
-0.138 +/- 0.010 |
0.10 |
263 |
| I |
(V-I) |
26.940 +/- 0.033 |
-0.007 +/- 0.013 |
0.05 |
103 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.431 +/- 0.073 |
0.139 +/- 0.017 |
0.45 |
34 |
| B |
(B-V) |
28.277 +/- 0.027 |
-0.071 +/- 0.006 |
0.25 |
227 |
| V |
(B-V) |
27.851 +/- 0.024 |
-0.019 +/- 0.007 |
0.15 |
102 |
| R |
(V-R) |
27.882 +/- 0.030 |
-0.112 +/- 0.011 |
0.10 |
245 |
| I |
(V-I) |
26.970 +/- 0.028 |
0.029 +/- 0.010 |
0.05 |
96 |
P76: November 2005 to March 2006
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.426 +/- 0.104 |
0.057 +/- 0.016 |
0.45 |
94 |
| B |
(B-V) |
28.313 +/- 0.043 |
-0.090 +/- 0.005 |
0.25 |
906 |
| V |
(B-V) |
27.935 +/- 0.042 |
-0.034 +/- 0.005 |
0.15 |
766 |
| R |
(V-R) |
27.978 +/- 0.042 |
-0.134 +/- 0.011 |
0.10 |
286 |
| I |
(V-I) |
26.995 +/- 0.078 |
0.045 +/- 0.018 |
0.05 |
466 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.516 +/- 0.090 |
0.061 +/- 0.013 |
0.45 |
113 |
| B |
(B-V) |
28.171 +/- 0.039 |
-0.070 +/- 0.005 |
0.25 |
796 |
| V |
(B-V) |
27.879 +/- 0.029 |
-0.029 +/- 0.003 |
0.15 |
1008 |
| R |
(V-R) |
27.917 +/- 0.067 |
-0.144 +/- 0.019 |
0.10 |
224 |
| I |
(V-I) |
26.989 +/- 0.062 |
0.048 +/- 0.014 |
0.05 |
433 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.427 +/- 0.142 |
0.116 +/- 0.018 |
0.45 |
128 |
| B |
(B-V) |
28.193 +/- 0.039 |
-0.096 +/- 0.004 |
0.25 |
1275 |
| V |
(B-V) |
27.879 +/- 0.033 |
-0.041 +/- 0.003 |
0.15 |
1439 |
| R |
(V-R) |
27.880 +/- 0.055 |
-0.154 +/- 0.014 |
0.10 |
341 |
| I |
(V-I) |
26.947 +/- 0.042 |
0.046 +/- 0.008 |
0.05 |
724 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.535 +/- 0.132 |
0.060 +/- 0.015 |
0.45 |
141 |
| B |
(B-V) |
28.319 +/- 0.043 |
-0.096 +/- 0.004 |
0.25 |
1741 |
| V |
(B-V) |
27.898 +/- 0.038 |
-0.038 +/- 0.003 |
0.15 |
1796 |
| R |
(V-R) |
27.968 +/- 0.046 |
-0.130 +/- 0.012 |
0.10 |
376 |
| I |
(V-I) |
27.009 +/- 0.040 |
0.053 +/- 0.007 |
0.05 |
1183 |
P75: April 2005 to September 2005
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.200 +/- 0.074 |
0.099 +/- 0.010 |
0.403 +/- 0.043 |
111 |
| B |
(B-V) |
28.198 +/- 0.033 |
-0.066 +/- 0.005 |
0.236 +/- 0.008 |
617 |
| V |
(B-V) |
27.819 +/- 0.031 |
-0.020 +/- 0.004 |
0.123 +/- 0.007 |
368 |
| R |
(V-R) |
27.857 +/- 0.022 |
-0.122 +/- 0.006 |
0.064 +/- 0.003 |
284 |
| I |
(V-I) |
26.958 +/- 0.030 |
0.030 +/- 0.006 |
0.069 +/- 0.017 |
186 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.295 +/- 0.075 |
0.102 +/- 0.009 |
0.387 +/- 0.040 |
132 |
| B |
(B-V) |
28.060 +/- 0.036 |
-0.057 +/- 0.005 |
0.239 +/- 0.009 |
570 |
| V |
(B-V) |
27.756 +/- 0.033 |
-0.014 +/- 0.004 |
0.126 +/- 0.009 |
506 |
| R |
(V-R) |
27.786 +/- 0.026 |
-0.122 +/- 0.007 |
0.064 +/- 0.004 |
316 |
| I |
(V-I) |
26.911 +/- 0.033 |
0.046 +/- 0.006 |
0.032 +/- 0.012 |
262 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.200 +/- 0.085 |
0.094 +/- 0.011 |
0.393 +/- 0.048 |
130 |
| B |
(B-V) |
28.078 +/- 0.032 |
-0.077 +/- 0.004 |
0.240 +/- 0.007 |
792 |
| V |
(B-V) |
27.762 +/- 0.025 |
-0.018 +/- 0.003 |
0.130 +/- 0.004 |
533 |
| R |
(V-R) |
27.750 +/- 0.022 |
-0.098 +/- 0.006 |
0.072 +/- 0.003 |
378 |
| I |
(V-I) |
26.893 +/- 0.027 |
0.038 +/- 0.004 |
0.070 +/- 0.012 |
257 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.244 +/- 0.086 |
0.095 +/- 0.010 |
0.315 +/- 0.042 |
132 |
| B |
(B-V) |
28.188 +/- 0.041 |
-0.082 +/- 0.004 |
0.220 +/- 0.005 |
921 |
| V |
(B-V) |
27.763 +/- 0.031 |
-0.017 +/- 0.004 |
0.115 +/- 0.003 |
600 |
| R |
(V-R) |
27.820 +/- 0.023 |
-0.088 +/- 0.005 |
0.063 +/- 0.002 |
425 |
| I |
(V-I) |
26.899 +/- 0.029 |
0.044 +/- 0.005 |
0.016 +/- 0.009 |
271 |
P74: October 2004 to March 2005
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.352 +/- 0.103 |
0.054 +/- 0.010 |
0.45 |
243 |
| B |
(B-V) |
28.213 +/- 0.030 |
-0.081 +/- 0.005 |
0.25 |
518 |
| V |
(B-V) |
27.820 +/- 0.028 |
-0.021 +/- 0.003 |
0.15 |
863 |
| R |
(V-R) |
27.867 +/- 0.029 |
-0.119 +/- 0.008 |
0.10 |
487 |
| I |
(V-I) |
26.948 +/- 0.028 |
0.047 +/- 0.004 |
0.05 |
1780 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.317 +/- 0.147 |
0.032 +/- 0.013 |
0.45 |
264 |
| B |
(B-V) |
28.072 +/- 0.040 |
-0.078 +/- 0.007 |
0.25 |
494 |
| V |
(B-V) |
27.777 +/- 0.060 |
-0.020 +/- 0.007 |
0.15 |
819 |
| R |
(V-R) |
27.841 +/- 0.061 |
-0.133 +/- 0.019 |
0.10 |
401 |
| I |
(V-I) |
26.933 +/- 0.042 |
0.048 +/- 0.006 |
0.05 |
1407 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.337 +/- 0.141 |
0.066 +/- 0.013 |
0.45 |
276 |
| B |
(B-V) |
28.107 +/- 0.037 |
-0.106 +/- 0.005 |
0.25 |
830 |
| V |
(B-V) |
27.781 +/- 0.027 |
-0.031 +/- 0.003 |
0.15 |
1320 |
| R |
(V-R) |
27.779 +/- 0.024 |
-0.123 +/- 0.007 |
0.10 |
555 |
| I |
(V-I) |
26.882 +/- 0.026 |
0.066 +/- 0.003 |
0.05 |
2301 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.449 +/- 0.129 |
0.047 +/- 0.010 |
0.45 |
323 |
| B |
(B-V) |
28.226 +/- 0.030 |
-0.103 +/- 0.003 |
0.25 |
961 |
| V |
(B-V) |
27.783 +/- 0.028 |
-0.024 +/- 0.003 |
0.15 |
1336 |
| R |
(V-R) |
27.860 +/- 0.026 |
-0.111 +/- 0.007 |
0.10 |
575 |
| I |
(V-I) |
26.970 +/- 0.049 |
0.050 +/- 0.005 |
0.05 |
2954 |
P73: April 2004 to September 2004
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.431 +/- 0.077 |
0.008 +/- 0.016 |
0.45 |
87 |
| B |
(B-V) |
28.137 +/- 0.033 |
-0.075 +/- 0.005 |
0.25 |
502 |
| V |
(B-V) |
27.925 +/- 0.024 |
-0.034 +/- 0.003 |
0.15 |
490 |
| R |
(V-R) |
27.962 +/- 0.043 |
-0.119 +/- 0.016 |
0.10 |
136 |
| I |
(V-I) |
27.030 +/- 0.044 |
0.021 +/- 0.014 |
0.05 |
127 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.359 +/- 0.075 |
0.028 +/- 0.013 |
0.45 |
92 |
| B |
(B-V) |
28.194 +/- 0.029 |
-0.075 +/- 0.005 |
0.25 |
483 |
| V |
(B-V) |
27.923 +/- 0.026 |
-0.035 +/- 0.004 |
0.15 |
540 |
| R |
(V-R) |
27.959 +/- 0.038 |
-0.141 +/- 0.010 |
0.10 |
296 |
| I |
(V-I) |
27.025 +/- 0.040 |
0.031 +/- 0.009 |
0.05 |
279 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.414 +/- 0.086 |
0.032 +/- 0.016 |
0.45 |
95 |
| B |
(B-V) |
28.193 +/- 0.026 |
-0.090 +/- 0.004 |
0.25 |
496 |
| V |
(B-V) |
27.881 +/- 0.023 |
-0.045 +/- 0.003 |
0.15 |
513 |
| R |
(V-R) |
27.877 +/- 0.034 |
-0.138 +/- 0.010 |
0.10 |
263 |
| I |
(V-I) |
26.954 +/- 0.034 |
0.036 +/- 0.010 |
0.05 |
144 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.509 +/- 0.094 |
0.056 +/- 0.014 |
0.45 |
100 |
| B |
(B-V) |
28.333 +/- 0.023 |
-0.087 +/- 0.003 |
0.25 |
435 |
| V |
(B-V) |
27.919 +/- 0.023 |
-0.038 +/- 0.003 |
0.15 |
466 |
| R |
(V-R) |
28.000 +/- 0.029 |
-0.117 +/- 0.008 |
0.10 |
309 |
| I |
(V-I) |
27.061 +/- 0.037 |
0.034 +/- 0.10 |
0.05 |
260 |
P72: October 2003 to February 2004
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.314 +/- 0.085 |
0.014 +/- 0.011 |
0.45 |
132 |
| B |
(B-V) |
28.161 +/- 0.039 |
-0.095 +/- 0.003 |
0.25 |
2352 |
| V |
(B-V) |
27.772 +/- 0.026 |
-0.037 +/- 0.002 |
0.15 |
1998 |
| R |
(V-R) |
27.823 +/- 0.027 |
-0.131 +/- 0.004 |
0.10 |
1304 |
| I |
(V-I) |
26.899 +/- 0.050 |
0.058 +/- 0.008 |
0.05 |
1102 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.334 +/- 0.087 |
0.017 +/- 0.012 |
0.45 |
134 |
| B |
(B-V) |
28.029 +/- 0.044 |
-0.087 +/- 0.004 |
0.25 |
2133 |
| V |
(B-V) |
27.722 +/- 0.032 |
-0.036 +/- 0.003 |
0.15 |
1899 |
| R |
(V-R) |
27.753 +/- 0.034 |
-0.140 +/- 0.006 |
0.10 |
986 |
| I |
(V-I) |
26.828 +/- 0.029 |
0.057 +/- 0.006 |
0.05 |
617 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.288 +/- 0.110 |
0.033 +/- 0.014 |
0.45 |
145 |
| B |
(B-V) |
28.032 +/- 0.047 |
-0.121 +/- 0.003 |
0.25 |
3061 |
| V |
(B-V) |
27.713 +/- 0.030 |
-0.060 +/- 0.002 |
0.15 |
2261 |
| R |
(V-R) |
27.709 +/- 0.033 |
-0.154 +/- 0.005 |
0.10 |
1297 |
| I |
(V-I) |
26.812 +/- 0.033 |
0.046 +/- 0.005 |
0.05 |
1261 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.400 +/- 0.097 |
0.026 +/- 0.010 |
0.45 |
180 |
| B |
(B-V) |
28.178 +/- 0.046 |
-0.106 +/- 0.003 |
0.25 |
3576 |
| V |
(B-V) |
27.760 +/- 0.037 |
-0.047 +/- 0.002 |
0.15 |
2598 |
| R |
(V-R) |
27.824 +/- 0.038 |
-0.116 +/- 0.005 |
0.10 |
1784 |
| I |
(V-I) |
26.933 +/- 0.041 |
0.025 +/- 0.006 |
0.05 |
1493 |
P71: April 2003 to August 2003
Fixed extinction coefficients.
Quadrant 1
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.544 +/- 0.098 |
-0.038 +/- 0.028 |
0.45 |
25 |
| B |
(B-V) |
28.360 +/- 0.037 |
-0.077 +/- 0.005 |
0.25 |
576 |
| V |
(B-V) |
27.965 +/- 0.004 |
-0.030 +/- 0.004 |
0.15 |
562 |
| R |
(V-R) |
27.982 +/- 0.022 |
-0.102 +/- 0.006 |
0.10 |
377 |
| I |
(V-I) |
27.050 +/- 0.025 |
0.037 +/- 0.008 |
0.05 |
361 |
Quadrant 2
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.516 +/- 0.094 |
-0.020 +/- 0.023 |
0.45 |
37 |
| B |
(B-V) |
28.188 +/- 0.044 |
-0.076 +/- 0.007 |
0.25 |
492 |
| V |
(B-V) |
27.865 +/- 0.031 |
-0.040 +/- 0.004 |
0.15 |
539 |
| R |
(V-R) |
27.871 +/- 0.028 |
-0.130 +/- 0.008 |
0.10 |
374 |
| I |
(V-I) |
26.970 +/- 0.027 |
0.056 +/- 0.008 |
0.05 |
325 |
Quadrant 3
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.498 +/- 0.092 |
-0.032 +/- 0.027 |
0.45 |
24 |
| B |
(B-V) |
28.209 +/- 0.041 |
-0.094 +/- 0.007 |
0.25 |
488 |
| V |
(B-V) |
27.872 +/- 0.029 |
-0.033 +/- 0.005 |
0.15 |
472 |
| R |
(V-R) |
27.847 +/- 0.028 |
-0.090 +/- 0.010 |
0.10 |
263 |
| I |
(V-I) |
26.960 +/- 0.026 |
0.071 +/- 0.010 |
0.05 |
264 |
Quadrant 4
| Filter |
Colour |
Zero Point |
Colour Term |
Ext. coefficient |
N. of stars |
| U |
(U-B) |
26.625 +/- 0.091 |
-0.043 +/- 0.023 |
0.45 |
34 |
| B |
(B-V) |
28.378 +/- 0.039 |
-0.095 +/- 0.006 |
0.25 |
581 |
| V |
(B-V) |
27.937 +/- 0.027 |
-0.028 +/- 0.004 |
0.15 |
584 |
| R |
(V-R) |
27.982 +/- 0.024 |
-0.087 +/- 0.008 |
0.10 |
309 |
| I |
(V-I) |
27.072 +/- 0.025 |
0.051 +/- 0.008 |
0.05 |
321 |
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