2009A&A...493..317L


Query : 2009A&A...493..317L

2009A&A...493..317L - Astronomy and Astrophysics, volume 493, 317-323 (2009/1-1)

On radio source selection to define a stable celestial frame.

LAMBERT S.B. and GONTIER A.-M.

Abstract (from CDS):

The most accurate realization of a quasi inertial reference frame, the International Celestial Reference Frame (ICRF), is made of 212 defining extragalactic radio sources whose coordinates are determined using VLBI observations. Recent studies demonstrated however that using other sets of sources could improve the frame stability. This study examines a simple radio source selection scheme to define celestial reference frame axes more stable than the ones as currently defined by the ICRF. After having derived source coordinate time series from 26 years of VLBI observations, we select the most suitable sources on the basis of their positional variability (rms and slope), and observational history. We determine the axis stability of the frame defined by the selection, as well as its suitability for global geodetic VLBI analyses, i.e., determination of Earth orientation parameters and source and station coordinates. We select four frames made of 196, 200, 262, and 269 sources, respectively, showing a satisfactory sky coverage in both hemispheres. Our selections provide a frame stability improved by up to 40% with respect to the ICRF, and by 20% with respect to the frame as defined by the 247 stable sources of Feissel-Vernier et al. (2006A&A...452.1107F). Reanalysis of data with respect to this frame gives astrometric catalogues aligned to the ICRF-Ext.2 within 17µas. Effects on the Earth orientation parameter estimates and terrestrial reference frame determination remain marginal. In view of the generation of the next ICRF, we recommend that such an algorithm be taken into consideration along with other criteria based on individual characteristics of the radio sources.

Abstract Copyright:

Journal keyword(s): reference systems - Earth

VizieR on-line data: <Available at CDS (J/A+A/493/317): list196.dat list200.dat list262.dat list269.dat>

Simbad objects: 267

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Number of rows : 267
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 QSO B0003+380 Bla 00 05 57.17538691 +38 20 15.1489639   19.4 18.10 17.16   ~ 143 1
2 QSO B0003-066 BLL 00 06 13.89288482 -06 23 35.3353584   19.1 18.50 17.14   ~ 330 1
3 QSO B0008-264 BLL 00 11 01.24673726 -26 12 33.3771340   19.53   19.64   ~ 81 0
4 ICRF J001331.1+405137 Sy1 00 13 31.13019909 +40 51 37.1441374   17.9 17.9     ~ 115 1
5 QSO B0013-005 QSO 00 16 11.08855044 -00 15 12.4454125   20.44 19.98 19.72   ~ 156 1
6 6C 001403+811827 BLL 00 17 08.47489694 +81 35 08.1365094   17.60 16.52 15.95   ~ 389 1
7 QSO B0016+73 QSO 00 19 45.78637230 +73 27 30.0176020     19.00 18.26   ~ 296 1
8 7C 0059+5808 QSO 01 02 45.76237340 +58 24 11.1366164   20.09 19.22 18.57 17.90 ~ 232 1
9 QSO B0104-408 QSO 01 06 45.10796439 -40 34 19.9603733   18.60 19.0 19.25   ~ 130 0
10 4C 01.02 Bla 01 08 38.77110544 +01 35 00.3171844   18.54 18.39 19.05   ~ 546 1
11 QSO B0111+021 BLL 01 13 43.14494773 +02 22 17.3162687   16.4 16.0 11.22   ~ 134 1
12 ICRF J012141.5+114950 Sy1 01 21 41.59504128 +11 49 50.4132344   19.5 19.70 18.61   ~ 184 1
13 QSO B0119+041 Bla 01 21 56.86169274 +04 22 24.7342932   19.2 19.5 19.40   ~ 189 1
14 QSO B0130-17 QSO 01 32 43.48746292 -16 54 48.5220804   18.75 18.44 15.44   ~ 225 1
15 ICRF J013305.7-520003 Sy1 01 33 05.76250002 -52 00 03.9454078   18.68 20.3 18.63   ~ 113 0
16 6C 013354+473615 Bla 01 36 58.59480326 +47 51 29.1000720     19.50 19.25 15.21 ~ 502 1
17 ICRF J013738.3-243053 Sy1 01 37 38.3462810880 -24 30 53.883832500   17.47 17.33 16.57   ~ 205 1
18 QSO B0146+056 QSO 01 49 22.37088634 +05 55 53.5685702   20.7 19.0 20.30   ~ 128 1
19 QSO B0201+113 QSO 02 03 46.65705710 +11 34 45.4094619   19.5 19.5 19.41   ~ 204 1
20 7C 020209.69+315812.00 QSO 02 05 04.92536206 +32 12 30.0954703     17.40 17.40   ~ 228 1
21 QSO B0208-512 BLL 02 10 46.2004407600 -51 01 01.893013392   17.10 16.93 14.82   ~ 449 1
22 QSO J0217+0144 QSO 02 17 48.95475095 +01 44 49.6990271   16.74 16.09 18.51 13.29 ~ 426 1
23 4C 06.11 QSO 02 24 28.42818961 +06 59 23.3415566   20.8 20.0 17.78   ~ 159 1
24 4C 13.14 Bla 02 31 45.89405619 +13 22 54.7162847   17.96 17.71 17.93   ~ 277 1
25 4C 28.07 QSO 02 37 52.40567519 +28 48 08.9899986     19.30 16.99   ~ 615 1
26 NGC 1052 Sy2 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1302 2
27 QSO B0239+108 QSO 02 42 29.17085078 +11 01 00.7279391   20.0   19.66   ~ 125 1
28 QSO B0256+075 QSO 02 59 27.07662321 +07 47 39.6429924   18 18 16.9   ~ 193 1
29 4C 47.08 BLL 03 03 35.24221958 +47 16 16.2754726   17.54 16.95 16.2   ~ 273 1
30 QSO B0302-623 QSO 03 03 50.63135648 -62 11 25.5500344   19.48   17.87   ~ 148 1
31 NGC 1218 Sy1 03 08 26.22380005 +04 06 39.3007808   12.84       ~ 383 1
32 QSO B0306+101 QSO 03 09 03.62349423 +10 29 16.3409179   18.45   19.91   ~ 194 1
33 QSO B0308-611 QSO 03 09 56.09914475 -60 58 39.0564095   19.00 18.5 18.18   ~ 138 1
34 ICRF J031951.2+190131 QSO 03 19 51.25671878 +19 01 31.2911047   19   17.76   ~ 47 1
35 QSO B0319+12 QSO 03 21 53.10350560 +12 21 13.9537765   19 19     ~ 133 1
36 6C 033321+320838 Bla 03 36 30.10760267 +32 18 29.3422162     17.50 16.6   ~ 656 1
37 QSO B0336-0156 QSO 03 39 30.93778633 -01 46 35.8041892   18.96 18.41 17.33   ~ 559 1
38 ICRF J034506.4+145349 QSO 03 45 06.41653204 +14 53 49.5582378       20.00   ~ 47 1
39 QSO B0400-319 QSO 04 02 21.26599921 -31 47 25.9455847   20.2   20.75   ~ 100 1
40 QSO B0400+258 QSO 04 03 05.58608082 +26 00 01.5027775     18 19.00   ~ 206 1
41 QSO J0403-3605 Bla 04 03 53.74990003 -36 05 01.9131880   17.04 17.17 16.67   ~ 286 1
42 PKS 0405-123 Sy1 04 07 48.4309841856 -12 11 36.659928408   15.09 14.86 14.7   ~ 511 1
43 QSO B0406+121 BLL 04 09 22.00871072 +12 17 39.8476330   20.5   18.27   ~ 105 1
44 QSO B0414-189 QSO 04 16 36.54444889 -18 51 08.3402457   18.89 18.0 18.51   ~ 176 1
45 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1210 3
46 QSO B0422-380 QSO 04 24 42.24370316 -37 56 20.7843026   17.96 18.08 18.03   ~ 100 1
47 QSO B0422+004 BLL 04 24 46.8421990080 +00 36 06.329375028 16.15 15.94 16.98     ~ 359 1
48 QSO J0429+2724 BLL 04 29 52.96076689 +27 24 37.8761387   18.6       ~ 38 0
49 Mrk 1506 Sy1 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 2002 2
50 QSO B0430+2859 BLL 04 33 37.82985981 +29 05 55.4770576   19.0 17.80 17.06   ~ 162 1
51 QSO B0434-188 QSO 04 37 01.48273617 -18 44 48.6135530   19.11 19.0 19.62   ~ 105 1
52 QSO B0437-454 BLL 04 39 00.85466368 -45 22 22.5631875   20.44 20.6 19.48   ~ 102 0
53 ICRF J044331.6+344106 Bz? 04 43 31.63519983 +34 41 06.6640402           ~ 36 1
54 QSO J0457-2324 QSO 04 57 03.1791422424 -23 24 52.021129572   18.85 18.5 16.56   ~ 397 1
55 QSO J0459+0229 QSO 04 59 52.05066296 +02 29 31.1765162   18.2 19     ~ 163 1
56 QSO B0502+049 QSO 05 05 23.18472514 +04 59 42.7245008   18.7 19.0 17.58   ~ 162 1
57 QSO J0506-6109 QSO 05 06 43.98874900 -61 09 40.9939787   17.16 16.85 16.9   ~ 181 2
58 QSO B0454+844 BLL 05 08 42.36351222 +84 32 04.5441733     16.5 18.95   ~ 242 1
59 QSO B0507+179 QSO 05 10 02.36912937 +18 00 41.5815635   20.0 19.0 19.09   ~ 436 1
60 QSO B0516-621 BLL 05 16 44.92617055 -62 07 05.3894029 18.50 18.09 17.85 17.46   ~ 125 1
61 ESO 362-21 Sy1 05 22 57.98464178 -36 27 30.8512953   15.26 14.62 14.48   ~ 838 2
62 QSO J0530+13 Bla 05 30 56.41674741 +13 31 55.1494688     20.00 19.35   ~ 961 1
63 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 885 2
64 ICRF J053942.3+143345 QSO 05 39 42.36599322 +14 33 45.5616887           ~ 87 1
65 QSO B0537-286 Bla 05 39 54.28147904 -28 39 55.9481236   19.70 20.0 18.789   ~ 291 1
66 QSO B0539-057 QSO 05 41 38.08336552 -05 41 49.4283917     20.4 20.70   ~ 261 1
67 NVSS J054734+272157 Rad 05 47 34.14892156 +27 21 56.8425747           ~ 40 1
68 6C 060237+672110 QSO 06 07 52.67161421 +67 20 55.4100806   20.6 20.6 20.21   ~ 95 1
69 QSO B0607-157 QSO 06 09 40.94954062 -15 42 40.6727537   18.47 18.00 19.90   ~ 315 1
70 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 592 1
71 ICRF J063920.9-334600 BLL 06 39 20.90464 -33 46 00.1134     20.50 20.30   ~ 36 1
72 QSO B0636+68 BLL 06 42 04.2572705040 +67 58 35.620484340     16.46 16.01   ~ 226 1
73 7C 064253.00+445430.00 QSO 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 348 1
74 QSO J0650-1637 QSO 06 50 24.58185949 -16 37 39.7255562   22.09       ~ 114 1
75 ICRF J065917.9+081330 QSO 06 59 17.99603181 +08 13 30.9534246           ~ 33 1
76 ICRF J070001.5+170921 QSO 07 00 01.52554306 +17 09 21.7013068   21.0       ~ 76 1
77 4C 47.23 BLL 07 10 46.10488160 +47 32 11.1426490   18.2 18.2 13.9   ~ 154 1
78 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1303 1
79 4C 14.23 BLL 07 25 16.80776465 +14 25 13.7465925       17.48   ~ 145 1
80 QSO B0723-007 BLL 07 25 50.63991258 -00 54 56.5430511   17.39 16.57 15.82   ~ 266 1
81 ICRF J072611.7+791131 Bz? 07 26 11.73523889 +79 11 31.0162113       23.08   ~ 49 0
82 QSO J0738+1742 BLL 07 38 07.39375312 +17 42 18.9981506   16.76 16.22 15.78   ~ 995 1
83 QSO B0738-674 QSO 07 38 56.49624352 -67 35 50.8260320     19.8 20.00   ~ 52 1
84 QSO B0736+01 QSO 07 39 18.03389906 +01 37 04.6177501   16.90 16.47 16.19   ~ 688 1
85 QSO B0742+103 QSO 07 45 33.05952486 +10 11 12.6922178     24.00 23.72   ~ 192 1
86 [VV2006] J074625.9+254901 Bla 07 46 25.87418071 +25 49 02.1347101   19.94 19.69 19.2   ~ 167 2
87 ICRF J074836.1+240024 Sy1 07 48 36.10928140 +24 00 24.1099425   19.70 18.89 17.88   ~ 218 1
88 QSO B0748+126 QSO 07 50 52.04573865 +12 31 04.8282079   17.67 17.28 17.16   ~ 335 1
89 4C 54.15 BLL 07 53 01.38457270 +53 52 59.6370830   18.5   16.77   ~ 156 1
90 QSO B0754+10 BLL 07 57 06.64295154 +09 56 34.8522544   15.43 15.00 15.99   ~ 440 1
91 7C 080458.39+495918.00 QSO 08 08 39.66628970 +49 50 36.5304041   19.55 19.18 18.34   ~ 363 2
92 7C 080533.60+410130.00 Bla 08 08 56.65204477 +40 52 44.8888932   19.87 19.41 16.61   ~ 132 1
93 QSO B0818-128 BLL 08 20 57.44762374 -12 58 59.1692275   15.30 15.00 16.5   ~ 179 1
94 4C 56.16A Bla 08 24 47.23636459 +55 52 42.6693589   18.52 18.19 17.82   ~ 200 1
95 QSO B0823+033 BLL 08 25 50.33835759 +03 09 24.5199749   17.81 17.23 16.91   ~ 330 1
96 QSO B0826-373 QSO 08 28 04.78023133 -37 31 06.2815112   16       ~ 57 0
97 ICRF J083052.0+241059 Sy1 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 530 1
98 ICRF J083148.8+042939 Sy1 08 31 48.8770033992 +04 29 39.086842884   17.10 16.4 14.55   ~ 473 2
99 QSO B0839+187 Bla 08 42 05.0940565824 +18 35 40.988568300   16.63 16.36 16.56   ~ 186 2
100 6C 085940+470301 QSO 09 03 03.99010563 +46 51 04.1374172   19.90 19.44 18.7   ~ 266 1
101 QSO B0919-260 QSO 09 21 29.35386197 -26 18 43.3863288   18.46 18.41 18.01   ~ 138 1
102 6C 091739+622838 QSO 09 21 36.23107643 +62 15 52.1803510   19.76 19.26 18.96   ~ 365 1
103 QSO B0920-397 Bla 09 22 46.41826886 -39 59 35.0682386   18.12 18.8     ~ 131 1
104 6C 092005+390241 Bz? 09 23 14.45293735 +38 49 39.9100905           ~ 44 1
105 ICRF J092751.8-203451 Sy1 09 27 51.82432394 -20 34 51.2325545   16.59 16.40 16.00   ~ 167 1
106 QSO B0952+179 QSO 09 54 56.82361677 +17 43 31.2221518   17.31 17.23     ~ 215 1
107 Ton 469 Sy1 09 58 20.9496221568 +32 24 02.208417372   15.88 15.78 15.51   ~ 425 1
108 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 716 1
109 QSO J1007+1356 QSO 10 07 41.49808928 +13 56 29.6007670     19.0 18.59   ~ 123 1
110 4C 40.25 Bla 10 23 11.56566843 +39 48 15.3853581   17.5 17.5 17.18   ~ 161 1
111 4C 19.34 QSO 10 24 44.80959654 +19 12 20.4155021   17.95 17.49 16.41   ~ 159 1
112 QSO B1030+074 QSO 10 33 34.02429368 +07 11 26.1475933     20.34 20.22   ~ 107 1
113 QSO B1032-199 QSO 10 35 02.15531760 -20 11 34.3596240   18.10 19.0 18.53   ~ 112 1
114 QSO B1034-293 QSO 10 37 16.07974265 -29 34 02.8134977   16.46 16.46 17.54   ~ 337 1
115 4C 06.41 BLL 10 41 17.16249940 +06 10 16.9237327   16.86 16.70 16.14   ~ 289 1
116 ICRF J104146.7+523328 Sy1 10 41 46.78165398 +52 33 28.2317956   16.96 18.5 16.39   ~ 135 1
117 6C 103912+811006 QSO 10 44 23.06257022 +80 54 39.4430485     16.5 18.29   ~ 215 1
118 ICRF J104806.6-190935 Sy1 10 48 06.62062314 -19 09 35.7272070   18.59 18.20 17.10   ~ 185 1
119 6C 104451+715930 QSO 10 48 27.61992778 +71 43 35.9384142     19.0 17.49   ~ 241 1
120 7C 104907.3+213551 QSO 10 51 48.78908056 +21 19 52.3137849     18.5 17.72   ~ 149 1
121 6C 105327+702759 QSO 10 56 53.61750640 +70 11 45.9155652   18.5 18.5 19.32   ~ 112 1
122 QSO J1058+8114 QSO 10 58 11.53538897 +81 14 32.6751532   18.5 20.0 18.14   ~ 108 1
123 ICRF J105829.6+013358 Sy1 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 780 2
124 QSO B1057-797 BLL 10 58 43.30979475 -80 03 54.1598058   19.08   17.31   ~ 194 0
125 MRC 1101-536 BLL 11 03 52.22168463 -53 57 00.6966389   18.30 17.9     ~ 81 1
126 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2682 1
127 QSO B1111+149 Bla 11 13 58.69508613 +14 42 26.9526507   17.89 17.57 17.41   ~ 113 1
128 CTD 74 Bla 11 25 53.71191677 +26 10 19.9787016   18.62 18.51 18.39   ~ 146 1
129 QSO B1124-186 QSO 11 27 04.39245388 -18 57 17.4418445   19.17 18.65 19.23   ~ 231 1
130 QSO J1130-1449 Bla 11 30 07.0523452128 -14 49 27.388021944   17.17 16.90 16 16.97 ~ 710 1
131 7C 112812.59+383153.00 QSO 11 30 53.28261620 +38 15 18.5469361   19.11 18.80 19.42   ~ 212 1
132 [VV2006] J113320.1+004052 QSO 11 33 20.05579109 +00 40 52.8371482   18.5   18.88   ~ 69 2
133 QSO B1143-245 QSO 11 46 08.1033450360 -24 47 32.900532360   17.97 18.0 17.20   ~ 124 1
134 ICRF J114658.2+395834 Sy1 11 46 58.29791724 +39 58 34.3043988   18.80 18.45 18.58   ~ 231 1
135 QSO B1144-3755 BLL 11 47 01.37071212 -38 12 11.0235229   19.03 16.2 16.72   ~ 301 1
136 QSO B1145-071 QSO 11 47 51.55403485 -07 24 41.1411766   19.0 18.5 18.10   ~ 192 1
137 Ton 599 Sy1 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 927 1
138 QSO B1213-172 QSO 12 15 46.75176509 -17 31 45.4031219     21.40 17.50   ~ 143 1
139 4C 35.28 QSO 12 15 55.60104732 +34 48 15.2206367     20.0 19.4   ~ 107 1
140 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 876 1
141 ICRF J122222.5+041315 Sy1 12 22 22.54962606 +04 13 15.7760715   17.88 17.98 17.06   ~ 324 1
142 8C 1221+809 BLL 12 23 40.49375661 +80 40 04.3404140     19.0 19.3   ~ 110 1
143 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1767 2
144 7C 122619.80+372307.00 Bla 12 28 47.42367714 +37 06 12.0958131   18.74 18.28 17.91   ~ 90 1
145 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7221 3
146 QSO B1236+077 QSO 12 39 24.58833099 +07 30 17.1890748   19.1 20.1 17.92   ~ 133 1
147 QSO J1246-0730 QSO 12 46 04.23211565 -07 30 46.5746985   17.6 18.0 18.2   ~ 186 1
148 QSO J1246-2547 QSO 12 46 46.80203943 -25 47 49.2889822   17.65 17.41 16.96 15.5 ~ 285 1
149 QSO B1252+119 Bla 12 54 38.25561478 +11 41 05.8950431   16.99 16.64 16.76   ~ 272 1
150 QSO B1251-713 QSO 12 54 59.92148599 -71 38 18.4366378   20.55       ~ 52 0
151 QSO B1255-316 QSO 12 57 59.06083282 -31 55 16.8516590   19.06   17.86   ~ 103 1
152 ICRF J130020.9+141718 Sy1 13 00 20.91882346 +14 17 18.5316374   19.50 19.17 18.9   ~ 78 1
153 7C 130046.50+580438.00 Bla 13 02 52.46528286 +57 48 37.6093029   20.47 19.76 20.63   ~ 115 1
154 QSO B1307+121 BLL 13 09 33.93245274 +11 54 24.5530422 18.95 18.72 18.28 18.16   ~ 143 1
155 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 855 1
156 7C 130838.79+324935.00 QSO 13 10 59.40273257 +32 33 34.4495500     16.8 19.00   ~ 91 1
157 QSO B1313-333 QSO 13 16 07.98594757 -33 38 59.1726741   18.04 20.0 17.23   ~ 254 1
158 QSO B1334-127 Bla 13 37 39.78278132 -12 57 24.6933925   18.5 19.00 16.22   ~ 505 1
159 ICRF J135256.5-441240 BLL 13 52 56.53494646 -44 12 40.3876155   16.95 16.37     ~ 121 3
160 [OKM2018] SWIFT J1357.0+1929 Sy1 13 57 04.4366598768 +19 19 07.371837768   16.33 16.03 15.3   ~ 456 2
161 QSO J1357-1527 QSO 13 57 11.24498272 -15 27 28.7868604   18.13   18.40   ~ 141 1
162 6C 135734+765743 QSO 13 57 55.37154275 +76 43 21.0509950     19.0 20.27   ~ 117 1
163 QSO B1402+044 QSO 14 05 01.11981857 +04 15 35.8188818   19.86 19.53 19.22   ~ 193 1
164 Mrk 668 Sy1 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 775 2
165 ICRF J141558.8+132023 Sy2 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 440 1
166 ICRF J141946.5+542314 Sy2 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 599 1
167 6C 141743+383524 QSO 14 19 46.61376262 +38 21 48.4750288   19.88 19.66 19.25   ~ 176 1
168 QSO B1424-41 QSO 14 27 56.29756617 -42 06 19.4376238   18.48 17.7 16.30   ~ 501 1
169 QSO B1445+101 QSO 14 45 16.46525080 +09 58 36.0727447   18.58 17.78     ~ 397 1
170 QSO B1445-161 QSO 14 48 15.05414259 -16 20 24.5488432   20.5 18.9 19.4   ~ 70 1
171 ICRF J145427.4-374733 Sy1 14 54 27.40976313 -37 47 33.1448219   16.36 16.69 16.14   ~ 183 1
172 QSO B1502+1041 Bla 15 04 24.97978391 +10 29 39.1985309   18.97 18.56 18.94   ~ 578 1
173 QSO B1504-167 QSO 15 07 04.78696269 -16 52 30.2671543   18.40 18.50 17.00   ~ 230 1
174 QSO B1508+572 QSO 15 10 02.92237321 +57 02 43.3759220   22.73 21.38 19.23   ~ 202 0
175 4C -05.64 QSO 15 10 53.59142427 -05 43 07.4175000   17.44 17.21     ~ 231 1
176 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1320 1
177 QSO B1514+197 BLL 15 16 56.79616460 +19 32 12.9919519 18.59 18.19 18.7 17.51   ~ 168 1
178 QSO B1514-24 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 774 3
179 QSO B1519-273 BLL 15 22 37.67599511 -27 30 10.7855131   18.72 18.5 17.42   ~ 295 1
180 QSO B1532+016 QSO 15 34 52.45368345 +01 31 04.2065145   19.0 18.5 18.58   ~ 203 2
181 QSO B1546+0246 Bla 15 49 29.43684740 +02 37 01.1632556   17.57 17.42 15.53   ~ 365 1
182 QSO B1555+001 QSO 15 57 51.43397121 -00 01 50.4137827   20.10 19.72 18.75   ~ 180 1
183 QSO J1559+0304 QSO 15 59 30.97261910 +03 04 48.2567339     19.8 19.77   ~ 78 1
184 4C 33.38 Bla 16 02 07.26346417 +33 26 53.0723251     23.0 23   ~ 139 1
185 QSO B1614+051 QSO 16 16 37.55681923 +04 59 32.7365717   19.60 19.17 19.49   ~ 186 2
186 QSO B1622-253 QSO 16 25 46.89164287 -25 27 38.3268734   21.3 20.6 19.60   ~ 354 1
187 4C 41.32 QSO 16 25 57.66971273 +41 34 40.6292008     22 21.73   ~ 165 1
188 QSO J1626-2951 Bla 16 26 06.02084013 -29 51 26.9712990   18.41 20.5 17.6   ~ 430 1
189 NGC 6251 Sy2 16 32 31.96989253 +82 32 16.3999044 15.24 14.66 12.89 7.62   ~ 731 0
190 4C 38.41 QSO 16 35 15.49297809 +38 08 04.5005995   18.14 17.97 17.25   ~ 859 1
191 ICRF J163813.4+572023 Sy1 16 38 13.45629995 +57 20 23.9789828     16.90 16.94   ~ 360 1
192 6C 163852+395305 QSO 16 40 29.63277140 +39 46 46.0284071   18.4 19.37 18.75   ~ 316 2
193 4C 69.21 QSO 16 42 07.84851261 +68 56 39.7563611   19.723   19.219   ~ 304 1
194 7C 165211.80+395026.00 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2170 2
195 QSO J1658+0515 QSO 16 58 33.4471896264 +05 15 16.442476596   17.00 16.54 16.21   ~ 227 1
196 QSO J1700-2610 QSO 17 00 53.15406418 -26 10 51.7253944   16.50       ~ 109 1
197 QSO B1705+0152 QSO 17 07 34.41527083 +01 48 45.6993042   18.5 18.9 18.52   ~ 101 1
198 ICRF J170934.3-172853 QSO 17 09 34.34539302 -17 28 53.3650596     17.5 20.90   ~ 47 1
199 7C 172601.30+453309.00 BLL 17 27 27.65080202 +45 30 39.7312530   19.0 18.10 16.64   ~ 209 1
200 ICRF J172824.9+042704 Sy1 17 28 24.95272284 +04 27 04.9138307   17.43 16.99 16.24   ~ 225 1
201 QSO B1730-130 QSO 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1141 1
202 4C 51.37 Bla 17 40 36.97784792 +52 11 43.4073694   18.16 18.70 16.73   ~ 415 1
203 QSO B1741-038 QSO 17 43 58.85613537 -03 50 04.6167326     20.40 17.98   ~ 549 1
204 6C 174400+554318 QSO 17 44 56.60706225 +55 42 17.1610560   13.0 13.5     ~ 77 1
205 QSO B1743+173 QSO 17 45 35.20817856 +17 20 01.4233245     19.0 18.21   ~ 71 1
206 4C 62.29 QSO 17 46 14.03413499 +62 26 54.7383195   20.91 19.51     ~ 116 1
207 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 949 1
208 7C 175844.60+384828.00 QSO 18 00 24.76536016 +38 48 30.6974570   17.8 17.98 17.04   ~ 151 1
209 8C 1803+784 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 15.46   ~ 743 1
210 3C 371 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 860 2
211 ICRF J180957.8-455241 Sy2 18 09 57.87174351 -45 52 41.0141114   16.89   15.06   ~ 56 1
212 ICRF J181945.3-552120 QSO 18 19 45.39951531 -55 21 20.7453837   19.19 16.0 21.50   ~ 68 1
213 4C 56.27 BLL 18 24 07.06837171 +56 51 01.4908155   18.9 19.30 16.48   ~ 483 1
214 [OKM2018] SWIFT J1848.5+6704 Sy1 18 49 16.07228484 +67 05 41.6802599     16.90 17.45   ~ 271 1
215 ICRF J185457.2+735119 Sy1 18 54 57.3000303816 +73 51 19.907445924     17.5 16.39   ~ 76 1
216 ICRF J190255.9+315941 Sy1 19 02 55.93889653 +31 59 41.7016439     17.5     ~ 271 2
217 QSO B1908-202 QSO 19 11 09.65289294 -20 06 55.1090664   18.21   18.14   ~ 285 0
218 [VV2006] J192332.2-210433 QSO 19 23 32.18981392 -21 04 33.3331234   15.32 17.50 16.70   ~ 163 2
219 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 871 0
220 ICRF J192559.6+210626 BLL 19 25 59.60535459 +21 06 26.1620257           ~ 203 1
221 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     16.06 15.11   ~ 535 2
222 QSO B1933-400 QSO 19 37 16.21735889 -39 58 01.5531167   18.15 19 17.43   ~ 195 2
223 QSO B1937-1009 BLL 19 39 57.2566747152 -10 02 41.522299692   18.800 19.0 17.188   ~ 196 1
224 QSO J1940-6907 QSO 19 40 25.52815148 -69 07 56.9717355   18.36 18.8     ~ 115 1
225 QSO B1954+513 QSO 19 55 42.73825546 +51 31 48.5461173     18.5 17.34   ~ 237 1
226 QSO B1954-388 QSO 19 57 59.81927491 -38 45 06.3558881   18.47 17.07 16.73   ~ 221 1
227 QSO B1958-179 QSO 20 00 57.09043927 -17 48 57.6726139   18.02 18.60 15.33   ~ 268 1
228 QSO B2000-330 QSO 20 03 24.1161711720 -32 51 45.136882080   18.83 18.4 17.11   ~ 273 1
229 QSO B2029+121 BLL 20 31 54.99426552 +12 19 41.3401260     18.5 17.42   ~ 168 1
230 3C 418.0 QSO 20 38 37.03472279 +51 19 12.6624988   21.30 21.00 18.9   ~ 312 0
231 QSO B2052-474 Bla 20 56 16.35980507 -47 14 47.6277179   18.29 19.1 18.07   ~ 318 1
232 QSO B2059+034 QSO 21 01 38.83415344 +03 41 31.3207714   18.13 17.78 17.68   ~ 165 1
233 QSO B2106-413 QSO 21 09 33.18859274 -41 10 20.6054240   20.20 21.0 20.41   ~ 106 1
234 QSO J2115+295 QSO 21 15 29.41345155 +29 33 38.3669390     19.5 19.26   ~ 174 1
235 ICRF J211630.8-805355 QSO 21 16 30.84565873 -80 53 55.2229061   20   19.50   ~ 38 1
236 QSO J2123+0535 QSO 21 23 44.51739933 +05 35 22.0930238   18.3 20.40 19.86   ~ 295 1
237 QSO B2128-123 BLL 21 31 35.2617909696 -12 07 04.795364172   16.33 16.11 15.87   ~ 455 1
238 QSO B2136+1410 QSO 21 39 01.30926630 +14 23 35.9921774     18.90 18.22   ~ 248 1
239 ICRF J214622.9-152543 Sy1 21 46 22.97932711 -15 25 43.8856539   17.70 17.27 17.20   ~ 136 1
240 4C 06.69 Bla 21 48 05.45866779 +06 57 38.6041877   16.85 16.47 15.06   ~ 676 1
241 ICRF J215137.8+055212 Sy1 21 51 37.87549026 +05 52 12.9545152   23.700 22.050 20.850   ~ 114 1
242 QSO B2149-306 Bla 21 51 55.52396937 -30 27 53.6980880   17.95 18.0 17.48   ~ 261 1
243 QSO B2150+173 BLL 21 52 24.81939266 +17 34 37.7950210     17.9 17.98   ~ 165 2
244 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2265 1
245 4C 31.63 BLL 22 03 14.9756830008 +31 45 38.269473228   15.85 15.58 14.33   ~ 497 1
246 QSO B2204-54 QSO 22 07 43.73329058 -53 46 33.8199643   18.45 18.0 18.20   ~ 164 1
247 QSO B2209+236 QSO 22 12 05.96631459 +23 55 40.5438259   19 20.66 19.69   ~ 231 1
248 4C -03.79 QSO 22 18 52.03772044 -03 35 36.8795441   16.93 16.38 16.15   ~ 341 1
249 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 831 1
250 QSO B2227-0848 Bla 22 29 40.08433313 -08 32 54.4355294   17.80 17.41 17.81   ~ 361 1
251 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1123 2
252 QSO B2232-488 QSO 22 35 13.23657823 -48 35 58.7945202   17.61 17.2     ~ 137 1
253 6C 223524+730738 QSO 22 36 38.59700566 +73 22 52.6622929       19.90   ~ 41 1
254 QSO J2246-1206 QSO 22 46 18.23197022 -12 06 51.2775983   16.63 16.45 15.99   ~ 283 1
255 ICRF J225307.3+194234 Sy1 22 53 07.36916889 +19 42 34.6286731   17.5 17.5 16.22   ~ 73 2
256 QSO B2253+417 QSO 22 55 36.70783988 +42 02 52.5326109     18.8     ~ 79 1
257 QSO B2254+0727 BLL 22 57 17.30311778 +07 43 12.3025633   17.07 16.36     ~ 303 1
258 ICRF J225805.9-275821 Sy1 22 58 05.96287687 -27 58 21.2567572   17.34 16.77 17.20   ~ 366 1
259 QSO J2320+0513 QSO 23 20 44.85659166 +05 13 49.9526016   18.6 19.0     ~ 155 1
260 4C 27.50 QSO 23 21 59.86222252 +27 32 46.4436999   19 19.0 18.8   ~ 146 1
261 QSO B2320-035 QSO 23 23 31.95375055 -03 17 05.0238540   18.6   18.16   ~ 207 1
262 QSO B2326-477 QSO 23 29 17.7043623168 -47 30 19.113949332   16.93 16.79 16.30   ~ 197 1
263 QSO B2329-16 BLL 23 31 38.65243833 -15 56 57.0098054   20.72   20.65   ~ 135 1
264 ICRF J233757.3-023057 Sy1 23 37 57.33907021 -02 30 57.6293054   18.1 19.27 18.97   ~ 132 1
265 QSO B2355-534 BLL 23 57 53.26605016 -53 11 13.6895021   18.63 17.8 16.89   ~ 169 1
266 QSO J2358-1020 QSO 23 58 10.88239662 -10 20 08.6114174   19.16 18.91 18.00   ~ 154 0
267 QSO B2357+385 QSO 23 59 33.18079487 +38 50 42.3182764   19.0 18.0 19.1   ~ 59 1

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