Table 2: Photometric data.
        Literature data             Observational data      
                        Magnitude Flux    
ICRF c z 6 cm $\alpha_{\rm R}$ Type MB B V R IntID MJD J H $K_{\rm s}$ J H $K_{\rm s}$ $\alpha$ $\sigma_{\alpha}$
name                                      
0312-770 C 0.223 0.56 0.3 Gal -24.5 15.93 16.1 15.3 01a 52 648.02 14.67 14.04 13.06 2.22 2.55 3.97   0.26
0431-512 C 0.557 0.59   Quasar -24.7 17.43 18.0 18.4 03p 52 649.02 16.88 16.03 15.17 0.29 0.40 0.57   0.01
0511-220 C 1.296 0.87 0.1 Quasar -25.4 19.34 19.5 19.6 04p 52 650.05 18.83 17.72 17.04 0.05 0.09 0.10   0.01
0521-365 D 0.055 8.89   BL Lac - 12.15 14.6 11.4 07p 52 650.03 13.10 12.30 11.54 9.40 12.60 16.14   0.12
0530-727 D - - - - - 18.85 - 18.0 08p 52 648.05 16.39 15.41 14.47 0.46 0.72 1.08   0.01
0528-250 O 2.765 0.85   Quasar -29.0 18.01 17.3 17.3 09a 52 649.04 16.09 15.71 15.39 0.60 0.55 0.47 0.44 0.01
0537-286 D 3.104 1.23 0.5 Quasar -27.7 19.72 20.0 19.0 10a 52 650.07 17.76 16.94 16.24 0.13 0.18 0.21   0.01
0614-349 C - -   Other - 19.98 18.0 16.8 11p 52 649.10 17.67 16.84 16.07 0.14 0.19 0.25   0.00
0622-441 C 0.688 0.89 0.2 Quasar -26.1 16.36 16.9 16.7 13p 52 650.10 15.81 15.09 14.28 0.78 0.97 1.30   0.03
0629-418 D 1.416 0.74 0.5 Quasar -26.0 18.18 19.3 18.2 14a 52 649.11 17.55 16.72 16.41 0.16 0.22 0.18   0.03
0637-752 D 0.654 6.19   Gal -27.0 16.00 15.8 15.8 15p 52 650.12 14.82 14.31 13.60 1.92 1.98 2.43   0.11
0646-306 C 0.455 * 0.2 Quasar -24.2 19.10 * 18.8 17a 52 648.09 16.90 15.93 15.02 0.28 0.44 0.66   0.00
0700-465 C * * 0.3 - -24.3 18.57 * 19.4 19a 52 649.15 15.67 14.82 13.94 0.88 1.23 1.76   0.02
0700-465 C * * 0.3 - -24.3 18.57 * 19.4 19a 52 650.19 16.10 15.27 14.36 0.59 0.82 1.20   0.02
0743-673 C 1.510 1.96   Quasar -28.6 16.15 16.4 15.9 23a 52 648.17 14.94 14.30 14.10 1.72 2.00 1.53 0.21 0.22
0809-493 C - -   - - 21.40 - - 24p 52 650.30 19.29 18.32 17.28 0.03 0.05 0.08   0.00
0823-500 C - - - - - - - - 25p 52 648.20 18.14 17.06 16.30 0.09 0.16 0.20   0.02
0823-223 C >0.910 0.78 0.5 BL Lac - 15.88 16.2 15.8 26a 52 649.18 14.22 13.31 12.47 3.35 4.98 6.87   0.09
0834-201 D 2.752 3.42   Quasar -27.9 19.09 19.4 18.8 30p 52 650.23 17.30 16.78 16.27 0.20 0.20 0.21   0.00
0842-754 C 0.524 1.38   Gal -24.2 18.03 18.9 17.0 31p 52 650.32 16.76 15.94 15.16 0.32 0.44 0.58   0.00
0919-260 O 2.300 2.38 0.2 Quasar -27.7 18.63 18.4 18.0 32p 52 650.24 16.45 15.89 15.16 0.43 0.46 0.58   0.02
0920-397 C 0.591 1.51   Quasar -24.4 18.54 18.8 17.7 33p 52 649.23 16.02 15.23 14.49 0.64 0.85 1.07   0.01
0925-203 C 0.348 0.69   Gal -25.3 16.34 16.4 16.0 34p 52 649.21 15.48 14.74 14.02 1.04 1.33 1.64   0.01
1048-313 C * *   - -25.7 - * - 38p 52 649.25 18.29 17.43 16.88 0.08 0.11 0.12   0.01
1101-325 C 0.354 0.73   Gal -25.5 17.11 16.3 15.5 39p 52 649.27 14.74 14.09 13.18 2.07 2.43 3.57   0.18
1101-536 C - - - Quasar - 17.82 17.9 16.4 40a 52 648.22 14.84 13.83 12.82 1.90 3.09 4.96   0.01
1104-445 O 1.598 2.03 0.1 Quasar -26.8 17.45 18.2 17.4 41a 52 648.25 16.20 15.39 15.07 0.54 0.73 0.62   0.09
1105-680 C 0.588 1.37 0.3 Quasar -23.6 17.89 18.4 17.9 42a 52 648.28 16.24 15.50 14.77 0.52 0.66 0.82   0.00
1116-462 C 0.713 1.31   Quasar -26.0 17.25 17.0 16.5 43a 52 648.32 15.79 15.41 14.55 0.79 0.72 1.01   0.10
1116-462 C 0.713 1.31   Quasar -26.0 17.25 17.0 16.5 43a 52 650.35 15.81 15.40 14.51 0.77 0.72 1.05   0.11
1129-580 C - - - - - 18.92 - 17.7 44a 52 649.33 15.73 15.01 14.39 0.83 1.04 1.17   0.03
1144-379 C 1.048 2.22   BL Lac -27.7 17.23 16.2 16.7 46a 52 649.29 15.97 15.14 14.14 0.67 0.92 1.47   0.05
Column 1: ICRF quasar identification; Col. 2: source category in the ICRF: Defining, Candidate or Other; Col. 3: redshift as given either by Archinal et al. (1997) or by the Veron-Cetty & Veron catalogue (Veron-Cetty & Veron 2003) (*); Col. 4: flux [Jy] at 6 cm as given either by Archinal et al. (1997) or by the Veron-Cetty & Veron catalogue (*); Col. 5: radio spectral index as given by Archinal et al. (1997); Col. 6: object type as given by Archinal et al. (1997); Col. 7: absolute B magnitude as given by the Veron-Cetty & Veron catalogue; Col. 8: B magnitude as given by the USNOB-1 catalogue (Monet et al. 2003); Col. 9: V magnitude as given either by Archinal et al. (1997) or by the Veron-Cetty & Veron catalogue (*); Col. 10: R magnitude as given by the USNOB-1 catalogue; Col. 11: internal identification - "p'' for photometry mode, and "a'' for astrometry mode; Col. 12: Modified Julian Date of the observation; Cols. 13-15: Observed J, H, and $K_{\rm s}$ magnitudes, respectively; Cols. 16-18: observed fluxes [mJy] in the J, H, and $K_{\rm s}$ filters, respectively; Col. 19: near-IR spectral indices, as derived from the observations in the J, H, and $K_{\rm s}$ filters; Col. 20: uncertainties of the spectral indices given by the preceding column.

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Article Contents
1 Introduction
2 Observations
3 Image analysis and data reduction
4 Photometric results
5 Astrometric results
6 Discussion
7 Conclusion
References
Online Material
List of tables
List of figures