Table 2: Photometric data of S 23 (in mag) collected from the literature and sorted by their year(s) of observation.
Year U B V R J H $K/K_{\rm s}$ References

1972-74 13.27 13.43 13.37 - - - - Azzopardi & Vigneau (1982)

1988 - - - - 13.04 12.79 12.16 Zickgraf et al. (1992)

1998 - - - - 13.02 12.76 12.15 Skrutskie et al. (2006, 2MASS)

1999 13.11 13.38 13.31 13.19 - - - Massey (2002)

**Table 2:** Photometric data of S 23 (in mag) collected from the literature and sorted by their year(s) of observation.
Year	U	B	V	R	J	H	$K/K_{\rm s}$	References
1972-74	13.27	13.43	13.37	-	-	-	-	Azzopardi & Vigneau (1982)
1988	-	-	-	-	13.04	12.79	12.16	Zickgraf et al. (1992)
1998	-	-	-	-	13.02	12.76	12.15	Skrutskie et al. (2006, 2MASS)
1999	13.11	13.38	13.31	13.19	-	-	-	Massey (2002)

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