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Table 1
A 1689 observations with VLT/HAWK-I in the J band.
| Date | Exp. time | Seeing | Det. eff. | m lim |
| 90% | average | |||
| (s) | (arcsec) | (mag) | (mag) | |
|
|
||||
| 2008-12-30 | 3420 | 0.69 | ||
| 2008-12-31 | 2400 | 0.57 | ||
| 2009-01-02 | 2400 | 0.65 | 23.05 | 22.97 |
|
|
||||
| 2009-01-30 | 7200 | 0.61 | 23.63 | 23.54 |
|
|
||||
| 2009-03-01 | 4800 | 0.53 | 23.85 | 23.67 |
|
|
||||
| 2009-03-23 | 4800 | 0.62 | 24.15 | 24.44 |
| 2009-03-25 | 4800 | 0.38 | ||
|
|
||||
| 2009-04-27 | 7200 | 0.56 | 23.87 | 23.87 |
|
|
||||
| 2009-06-07 | 2400 | 0.66 | 23.28 | 23.10 |
|
|
||||
| 2009-07-03 | 2400 | 0.61 | ||
| 2009-07-05 | 2400 | 0.63 | 23.53 | 23.49 |
| 2009-07-07 | 2400 | 0.73 | ||
|
|
||||
| 2011-05-29 | 2400 | 0.87 | Used as | 24.30 |
| 2011-05-30 | 7200 | 0.44 | a reference | |
|
|
||||
| 2013-03-14 | 6960 | 0.61 | 23.92 | 24.11 |
|
|
||||
| 2013-03-29 | 3480 | 0.44 | ||
| 2013-03-31 | 3480 | 0.57 | 24.26 | 24.44 |
| 2013-04-02 | 3480 | 0.36 | ||
|
|
||||
| 2013-04-25 | 3480 | 0.61 | ||
| 2013-05-06 | 3480 | 0.44 | 24.19 | 24.69 |
| 2013-05-07 | 3480 | 0.44 | ||
|
|
||||
| 2013-06-04 | 3480 | 0.64 | 23.48 | 23.97 |
| 2013-06-05 | 3480 | 0.61 | ||
|
|
||||
| 2014-03-08 | 3480 | 0.48 | 23.95 | 23.62 |
| 2014-03-15 | 2160 | 0.59 | ||
|
|
||||
| 2014-05-17 | 3480 | 0.82 | 23.52 | 23.28 |
| 2014-05-19 | 3480 | 0.91 | ||
|
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||||
| 2014-06-19 | 3480 | 0.78 | 22.55 | 22.77 |
|
|
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| 2014-07-20 | 3480 | 0.37 | 23.94 | 23.74 |
Notes. The line indicates that a stack of those observations was made.
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