Notes: The correlation Ra-Dc and the MJD of observation span are not available for the sources treated as arc sources. (1) ICRF Designations, constructed from J2000.0 coordinates with the format ICRF JHHMMSS.s+DDMMSS or ICRF JHHMMSS.s-DDMMSS They follow the recommendations of the IAU Task Group on Designations. (2) IERS Designations, constructed from B1950 coordinates. The complete format, including acronym and epoch, is IERS BHHMM+DDd or IERS BHHMM-DDd (3) X: Structure Index at X-band S: Structure Index at S-band H: Asterisk indicates that the source serves to link Hipparcos stellar reference frame to the ICRF. (4) Number of pairs of delay and delay rate observations. (5) A # indicates that the source is suspected to be not suitable to define the axes in the future. Coordinates of the new sources in ICRF-Ext.1 ------------------------------------------------------------------------------------------------------------------------------------------ ICRF Designation IERS Des. Inf. Right ascension Declination Uncertainty Corr. Mean First Last Nb Nb (1) (2) (3) J2000.0 J2000.0 R.A. Dec. Ra-Dc MJD MJD MJD sess. del. X S H h m s o ' " s " of observation span (4) ------------------------------------------------------------------------------------------------------------------------------------------ ICRF J004847.1+315725 0046+316 0 48 47.141497 31 57 25.08510 0.000022 0.00038 -.178 50859.5 50303.8 51268.8 8 73 ICRF J005748.8+302108 0055+300 0 57 48.883353 30 21 8.81213 0.000022 0.00031 -.450 50844.6 50303.8 51296.8 10 93 ICRF J013027.6+084246 0127+084 1 30 27.634455 8 42 46.17240 0.000041 0.00107 -.095 51189.4 51184.8 51205.8 2 9 ICRF J013243.4-165448 0130-171 1 32 43.487454 -16 54 48.52137 0.000036 0.00071 .406 51122.3 51114.8 51212.8 2 13 ICRF J020434.7+090349 0201+088 2 4 34.759290 9 3 49.26346 0.000065 0.00129 -.317 50065.8 50065.8 50065.8 1 14 ICRF J030826.2+040639 0305+039 3 8 26.223804 4 6 39.30105 0.000019 0.00039 -.208 50902.2 50303.8 51254.8 13 90 ICRF J031049.8+381453 0307+380 3 10 49.879957 38 14 53.83713 0.000121 0.00095 -.397 49939.8 49939.8 49939.8 1 8 ICRF J033409.9+022609 0331+022 3 34 9.947421 2 26 9.64289 0.000283 0.00975 .692 50559.1 50554.8 50560.6 2 4 ICRF J033654.0-361606 0335-364 3 36 54.023499 -36 16 6.22344 0.000106 0.00259 .357 50988.8 50988.8 50988.8 1 3 ICRF J041243.6+230505 0409+229 4 12 43.666851 23 5 5.45299 0.000022 0.00043 -.111 50778.0 50519.8 51128.8 6 44 ICRF J042655.7+232739 0423+233 4 26 55.734784 23 27 39.63369 0.000036 0.00073 -.406 50573.6 50561.8 50624.8 2 16 ICRF J042952.9+272437 0426+273 4 29 52.960759 27 24 37.87628 0.000018 0.00028 -.077 50798.5 50526.8 51261.8 11 165 ICRF J043337.8+290555 0430+289 4 33 37.829860 29 5 55.47701 0.000017 0.00026 -.038 50501.9 50043.8 51212.8 28 460 ICRF J044848.5-741731 0450-743 4 48 48.558058 -74 17 31.24880 0.002941 0.00585 .878 50182.6 50182.6 50182.6 1 5 ICRF J053435.7-610607 0534-611 5 34 35.772348 -61 6 7.08417 0.002322 0.01333 .836 50182.6 50182.6 50182.6 1 2 ICRF J055704.7+241355 0554+242 5 57 4.713575 24 13 55.29859 0.000018 0.00028 .327 50453.0 50065.8 51226.8 18 238 ICRF J060351.5+215937 0600+219 6 3 51.557091 21 59 37.69750 0.000081 0.00346 -.251 50168.7 50168.7 50168.7 1 4 ICRF J060550.8+403008 0602+405 6 5 50.855350 40 30 8.10303 0.000038 0.00055 -.023 50422.3 50255.8 51116.2 2 31 ICRF J061350.1+260436 0610+260 6 13 50.139193 26 4 36.71977 0.000023 0.00039 -.132 50646.5 50065.8 51002.8 6 63 ICRF J065510.0+410010 0651+410 6 55 10.024770 41 0 10.15944 0.000051 0.00080 .079 51296.8 51296.8 51296.8 1 6 ICRF J073730.0+594103 0733+597 7 37 30.088779 59 41 3.18263 0.004350 0.02771 -.988 50303.8 50303.8 50303.8 1 2 ICRF J080757.5+043234 0805+046 8 7 57.538579 4 32 34.53139 0.000024 0.00058 -.095 51018.3 50960.8 51184.8 4 27 ICRF J095232.0+351252 0949+354 9 52 32.026179 35 12 52.40229 0.000049 0.00084 .271 51156.8 51156.8 51156.8 1 4 ICRF J095622.6+575355 0952+581 9 56 22.634447 57 53 55.90455 0.000081 0.00066 -.036 50974.8 50974.8 50974.8 1 10 ICRF J095738.1+552257 0954+556 9 57 38.185757 55 22 57.76386 0.001545 0.00444 -.480 50960.8 50960.8 50960.8 1 2 ICRF J103334.0+071126 1030+074 10 33 34.024295 7 11 26.14799 0.000018 0.00031 -.152 51133.3 50855.8 51296.8 19 155 ICRF J104552.7+062436 1043+066 10 45 52.733247 6 24 36.45280 0.000032 0.00092 -.512 50538.5 50168.7 51282.8 5 22 ICRF J110741.7+723236 1104+728 11 7 41.722557 72 32 36.00497 0.000054 0.00049 -.225 50879.8 50799.8 51044.8 3 21 ICRF J113626.4+700927 1133+704 11 36 26.408434 70 9 27.30714 0.000063 0.00044 -.124 50790.7 50303.8 51142.8 6 41 ICRF J114505.0+193622 1142+198 11 45 5.009037 19 36 22.74151 0.000021 0.00046 .090 50662.2 50386.8 51114.8 10 95 ICRF J114722.1+350107 1144+352 11 47 22.130606 35 1 7.52292 0.000046 0.00065 .168 50728.9 50303.8 51184.8 3 17 ICRF J114850.3+592456 1146+596 11 48 50.358242 59 24 56.38243 0.000138 0.00099 .125 50555.1 50303.8 50722.8 3 11 ICRF J121923.2+054929 1216+061 12 19 23.211107 5 49 29.73937 0.053679 0.52054 -.999 50303.8 50303.8 50303.8 1 1 ICRF J122006.8+291650 1217+295 12 20 6.825261 29 16 50.71171 0.001242 0.01465 -.726 50258.8 50168.7 50303.8 2 3 ICRF J122011.8+020342 1217+023 12 20 11.884600 2 3 42.22454 0.000034 0.00129 -.221 50555.8 50441.6 50680.8 3 9 ICRF J122503.7+125313 1222+131 12 25 3.743329 12 53 13.13958 0.000020 0.00056 -.127 50736.1 50303.8 51170.8 11 71 ICRF J122836.9-030439 1226-028 12 28 36.917264 - 3 4 39.31303 0.000051 0.00226 .273 50571.3 50526.8 50610.8 4 19 ICRF J124209.8+372005 1239+376 12 42 9.812378 37 20 5.69235 0.000026 0.00060 .157 50402.8 50168.7 50750.8 7 29 ICRF J131059.4+323334 1308+328 13 10 59.402725 32 33 34.44956 0.000018 0.00027 -.113 50529.0 49706.7 51289.8 25 358 ICRF J133245.2+472222 1330+476 13 32 45.246442 47 22 22.66760 0.000058 0.00067 .085 50750.8 50750.8 50750.8 1 7 ICRF J135446.5-104102 1352-104 13 54 46.518679 -10 41 2.65656 0.000021 0.00055 -.434 50599.5 50456.8 50750.8 9 48 ICRF J135706.0-174401 1354-174 13 57 6.074200 -17 44 1.90413 0.000026 0.00065 -.345 50768.8 50456.8 51107.8 8 26 ICRF J142637.0+362509 1424+366 14 26 37.087495 36 25 9.57393 0.000037 0.00044 -.166 51008.0 50868.7 51128.8 2 28 ICRF J142921.8+540611 1427+543 14 29 21.878790 54 6 11.12291 0.000024 0.00030 -.306 50904.4 50736.8 51240.8 3 127 ICRF J143023.7+420436 1428+422 14 30 23.741648 42 4 36.49100 0.000028 0.00043 .118 50973.1 50764.8 51296.8 7 46 ICRF J143239.8+361807 1430+365 14 32 39.829633 36 18 7.93289 0.000036 0.00084 -.096 50692.5 50303.8 51044.8 6 28 ICRF J151053.5-054307 1508-055 15 10 53.591431 - 5 43 7.41718 0.000020 0.00041 -.084 50859.3 50610.8 51233.8 7 44 ICRF J160332.0+171155 1601+173 16 3 32.083282 17 11 55.31359 0.000524 0.02052 -.895 50303.8 50303.8 50303.8 1 2 ICRF J163231.9+823216 1637+826 16 32 31.969981 82 32 16.39990 0.000063 0.00027 -.287 51116.2 50820.8 51296.8 18 174 ICRF J163745.1+471733 1636+473 16 37 45.130564 47 17 33.83134 0.000024 0.00037 -.067 51268.8 51268.8 51268.8 1 18 ICRF J164125.2+225704 1639+230 16 41 25.227566 22 57 4.03307 0.000022 0.00044 -.318 50760.6 50168.7 51156.8 4 26 ICRF J173548.0+361645 1734+363 17 35 48.086675 36 16 45.61139 0.000056 0.00060 -.097 49939.8 49939.8 49939.8 1 24 ICRF J174456.6+554217 1744+557 17 44 56.607092 55 42 17.16110 0.000024 0.00029 .081 50771.0 50303.8 51240.8 10 151 ICRF J175559.7+182021 1753+183 17 55 59.717551 18 20 21.77756 0.045536 0.28574 .997 50303.8 50303.8 50303.8 1 1 ICRF J184511.1+400751 1843+400 18 45 11.131495 40 7 51.57705 0.000142 0.00157 .183 50053.5 50022.8 50065.8 2 7 ICRF J195928.3+404402 1957+406 19 59 28.356677 40 44 2.09658 0.000703 0.00471 -.764 50974.8 50974.8 50974.8 1 2 ICRF J223222.5-165901 2229-172 22 32 22.564042 -16 59 1.89198 0.000456 0.00488 .055 50953.8 50946.8 50960.8 2 4 ICRF J223638.5+732252 2235+731 22 36 38.597010 73 22 52.66214 0.000031 0.00028 .228 51151.9 51072.8 51296.8 16 126 ICRF J225307.3+194234 2250+190 22 53 7.369176 19 42 34.62843 0.000021 0.00042 -.407 51008.2 50771.8 51226.8 7 51