Table 3: Optical identifications.

SA57X	IdRanka	NSERb	RA(2000)	Dec(2000)	BJ	F	z	Classc
4	A	3049	13 08 56.66	29 11 58.9	23.14	21.70
		3017	13 08 56.68	29 11 57.3	23.03	21.49
8	I	3544	13 08 49.65	29 12 44.8	20.17	19.91	1.808	Q
9	I	3535	13 07 54.64	29 12 46.3	20.41	19.16	0.403	G
11	I	3927	13 08 52.56	29 13 26.6	22.82	22.14
12	I	3993	13 08 35.39	29 13 34.6	22.95	22.14
13	I	4274	13 08 58.44	29 14 02.6	23.82	22.26
14	M	4290	13 08 29.43	29 14 04.0	24.68
15	I	4437	13 07 48.90	29 14 17.8	22.13	21.35	0.706	G
17	I	4455	13 07 41.86	29 14 19.2	23.41	23.12
19	I	4793	13 07 37.48	29 14 52.4	23.91	23.58
20	I	4811	13 09 00.38	29 14 53.8	22.80	21.32	3.543	Q
21	I	4882	13 08 12.20	29 14 59.1	21.89	21.30	1.468	Q
22	I	4855	13 09 20.52	29 14 58.6	22.35	21.70	1.305	Q
23	I	5141	13 08 27.22	29 15 25.2	20.60	20.16	1.094	Q
25	I	5185	13 08 18.43	29 15 30.0	21.66	21.04		[Q]e
27	I	5422	13 09 11.88	29 15 52.7	20.62	19.98	1.083	Q
29	I	5643	13 08 15.75	29 16 12.3	21.17	20.74	0.983	Q
30	M	5711	13 08 28.37	29 16 19.0	23.78	22.45
31	I	5767	13 07 38.11	29 16 26.5	20.60	19.71	0.708	Q
33	I	6442	13 09 04.77	29 17 29.6	22.28	22.62	2.124	Q
34	A	6579	13 08 47.67	29 17 44.6	23.35	23.01
		6593	13 08 47.27	29 17 46.2	24.51	22.40
35	I	6669	13 07 49.58	29 17 54.4	22.96	22.31		BTKe
37	I	6825	13 08 22.19	29 18 07.8	22.92	21.26
38	I	6884	13 08 13.52	29 18 12.5	20.83	19.01
40	I	7251	13 07 58.01	29 18 42.8	23.20	22.32
41	I	7326	13 08 39.78	29 18 50.2	21.03	20.55	1.315	Q
42	I	7567	13 08 32.10	29 19 12.0	20.51	20.34	1.812	Q
44	M	7585	13 08 42.20	29 19 14.4	25.40	22.18
45	M	7727	13 08 28.63	29 19 26.2	22.78	22.36
46	M	7598	13 08 02.56	29 19 14.9	23.68	22.34
47	I	7624	13 08 16.09	29 19 17.6	19.44	19.06	1.738	Q
48	I	7822	13 07 42.64	29 19 36.5	22.21	22.01	2.458	Q
49	I	7996	13 08 32.14	29 19 52.1	22.61	21.83
51	I	8169	13 08 01.68	29 20 09.1	21.96	21.47	0.737	Q
52	I	8184	13 08 22.09	29 20 10.5	23.86	22.63
53	I	8222	13 07 41.37	29 20 14.9	23.81	22.48
54	M	8212	13 07 45.40	29 20 13.8	23.46	22.95
56	M	8659	13 08 47.08	29 20 50.3	22.16	21.55
57	M	8754	13 09 01.20	29 20 57.4	27.34	23.15
60	I	8845	13 07 58.75	29 21 06.2	21.99	20.85
61	I	8890	13 08 55.51	29 21 10.5	20.96	19.05
62	M	8965	13 08 39.81	29 21 17.8	22.92	22.72
66	A	9215	13 08 56.26	29 21 40.6	21.71	20.41
		9342	13 08 56.78	29 21 50.5	20.89	19.14
67	M	9158	13 07 46.95	29 21 34.3	23.02	22.56
68	A	9382	13 08 57.63	29 21 54.1	23.27	21.67
		9418	13 08 57.72	29 21 57.4	22.22	20.44
69	I	9494	13 09 16.19	29 22 03.7	16.26	15.60	0.021	G
71	M	9820	13 08 56.74	29 22 29.0	21.87	20.10
73	I	9877	13 08 23.34	29 22 34.2	22.06	21.50	2.12	Q
76	I	9934	13 08 06.16	29 22 39.0	22.27	21.82	2.53	Q
77	I	9980	13 08 13.24	29 22 44.0	20.24	20.05	1.545	Q
79	I	G5984d	13 08 37.00	29 22 48.0	21.07			G
80	I	10063	13 09 07.96	29 22 52.4	23.29	22.95
81	I	10144	13 09 00.18	29 22 58.9	20.18	18.47
82	I	10195	13 07 33.46	29 23 03.8	20.97	19.72	0.243	BTKe
83	I	10304	13 08 51.82	29 23 14.7	26.21	23.39
86	I	G55866d	13 08 19.05	29 23 34.8	23.93			G
88	I	10756	13 08 16.25	29 23 56.4	20.57	19.74	0.218	G
89	A	10867	13 07 57.48	29 24 06.4	23.24	23.04
		10951	13 07 57.25	29 24 14.1	23.10	22.24
90	A	10973	13 08 50.07	29 24 16.2	22.86	21.70
		10953	13 08 50.34	29 24 15.0	20.96	20.07
91	I	11014	13 08 27.80	29 24 20.7	17.96	16.57	0.125	G
92	I	11168	13 08 12.62	29 24 34.3	23.65	21.98
94	I	11320	13 08 47.60	29 24 50.8	24.11	23.50
95	I	11450	13 08 30.42	29 25 01.7	22.31	22.07	0.959	Q
96	I	11610	13 08 11.92	29 25 12.5	19.56	19.01	3.016	Q
97	I	11710	13 08 25.43	29 25 20.9	23.80	24.67
99	I	12053	13 07 49.24	29 25 48.1	19.64	18.28	0.241	G
100	I	G48612d	13 07 41.85	29 26 22.9	22.19	21.85		G
101	I	G48617d	13 08 09.04	29 26 25.9	22.42	22.31		G
102	I	12472	13 07 29.20	29 26 25.4	22.58	20.93
103	I	12467	13 08 34.36	29 26 28.2	20.19	19.69	0.201	G
104	M	12734	13 08 15.54	29 26 50.3	23.79	23.36
105	I	12758	13 08 10.16	29 26 52.2	21.99	20.83
106	I	12787	13 08 36.58	29 26 56.0	24.20	22.66
107	A	13035	13 09 23.96	29 27 15.9	22.94	20.95
		13088	13 09 23.71	29 27 20.2	23.40	21.47
108	I	13155	13 08 08.73	29 27 26.8	21.71	21.06		[Q]e
109	M	13310	13 07 56.71	29 27 38.0	21.66	21.07
110	I	13360	13 08 13.16	29 27 43.5	22.86	22.81
111	I	13412	13 09 06.34	29 27 48.1	22.11	21.85	2.082	Q
113	M	G55532d	13 08 53.56	29 27 51.1	23.81			G
114	I	13459	13 07 51.79	29 27 51.6	22.83	22.00		BTKe
115	I	13732	13 08 24.04	29 28 19.2	22.76	22.64
116	I	13966	13 08 44.15	29 28 40.3	21.30	20.96	0.951	Q
117	I	13993	13 08 44.83	29 28 43.6	23.16	21.71
118	A	14002	13 08 55.19	29 28 45.0	24.23	22.03
		14128	13 08 55.44	29 28 57.1	21.96	20.19
120	I	14264	13 08 03.40	29 29 08.8	20.39	18.78	0.288	BTKe
122	I	14630	13 08 51.24	29 29 45.4	23.82	22.93
123	A	14733	13 08 20.29	29 29 56.3	23.21	21.93
		14728	13 08 20.37	29 29 56.6	23.19	21.64
		14795	13 08 20.55	29 30 01.1	20.77	19.01	0.318	G
		G59730d	13 08 20.02	29 29 58.1	22.98			G
		G59724d	13 08 20.33	29 30 02.9	20.19			G
124	A	15102	13 08 12.16	29 30 27.5	23.67	23.24
		15093	13 08 11.92	29 30 27.7	23.38	23.29
125	I	15180	13 08 24.40	29 30 36.9	21.13	20.71	1.797	Q
126	I	15248	13 08 42.15	29 30 43.9	22.28	21.79	1.145	Qe
127	I	15465	13 09 17.09	29 31 04.3	21.89	21.15		[Q]e
131	I	16251	13 08 31.73	29 32 20.9	23.68	22.21
134	I	16677	13 08 49.85	29 33 03.3	23.45	23.25
135	M	16713	13 07 49.36	29 33 03.3	19.73	19.20	0.993	Q
136	I	17001	13 08 06.24	29 33 32.4	23.17	23.19		BTKe
137	A	17231	13 08 47.04	29 33 56.1	24.33
		17174	13 08 47.39	29 33 50.5	23.64	22.14
139	I	17494	13 08 33.43	29 34 23.2	23.37	22.51	0.75	RG
140	I	17750	13 08 08.51	29 34 49.1	19.79	19.23	1.179	Q

a Rank of optical identification: I = identified, M = marginal identification, A = ambiguous identification. b Serial number in the optical catalogue of the KPNO survey of SA 57 (Koo 1986; Kron 1980). c Q: quasar; G: galaxy; BTK extended variable object from Bershady et al. (1998); RG: radio galaxy; [Q]: point-like quasar candidate. d Serial number in the North Galactic Pole Faint Galaxy Catalogue (Infante et al. 1995). e Candidates or confirmed AGNs selected through variability and not preaviously selected by other methods.