Table 18.
Identification of the 21 sectors over the celestial sphere where no suitable defining source was found, either because there is no ICRF3 source in that sector or because the source available (indicated in parentheses) has poor (category C) structure.
| Right Asc. |
Declination |
||||
|---|---|---|---|---|---|
| Sector | Min | Max | Min | Max | Source |
| number | (h m) | (h m) | (°) | (°) | name |
| 24 | 01 20 | 02 40 | −26.39 | −19.47 | (0135−247) |
| 26 | 01 20 | 02 40 | −12.84 | −6.38 | (0138−097) |
| 35 | 01 20 | 02 40 | 51.06 | 62.73 | (0144+584) |
| 44 | 02 40 | 04 00 | −12.84 | −6.38 | (0238−084) |
| 50 | 02 40 | 04 00 | 26.39 | 33.75 | (0333+321) |
| 70 | 04 00 | 05 20 | 41.81 | 51.06 | (0420+417) |
| 126 | 08 00 | 09 20 | 62.73 | 90.00 | (0836+710) |
| 143 | 09 20 | 10 40 | 51.06 | 62.73 | (0917+624) |
| 161 | 10 40 | 12 00 | 51.06 | 62.73 | (1038+528) |
| 171 | 12 00 | 13 20 | −6.38 | 0.00 | (1253−055) |
| 178 | 12 00 | 13 20 | 41.81 | 51.06 | (1216+487) |
| 230 | 16 00 | 17 20 | 26.39 | 33.75 | (1600+335) |
| 239 | 17 20 | 18 40 | −33.75 | −26.39 | |
| 263 | 18 40 | 20 00 | 6.38 | 12.84 | (1947+079) |
| 269 | 18 40 | 20 00 | 51.06 | 62.73 | (1954+513) |
| 272 | 20 00 | 21 20 | −62.73 | −51.06 | |
| 275 | 20 00 | 21 20 | −33.75 | −26.39 | (2000−330) |
| 287 | 20 00 | 21 20 | 51.06 | 62.73 | (2037+511) |
| 304 | 21 20 | 22 40 | 41.81 | 51.06 | (2200+420) |
| 309 | 22 40 | 24 00 | −51.06 | −41.81 | (2326−477) |
| 318 | 22 40 | 24 00 | 12.84 | 19.47 | (2251+158) |
Notes. Each sector is numbered and defined by a range in right ascension and a range in declination.
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