43 GHz Calibrators
One part of BAaDE includes performing astrometric observations of the SiO masers at 43 GHz. The biggest challenge here is to find a sufficiently close calibrator (within a degree or two) that is detectable at baselines of 1000s of km at 43 GHz. The VLBA calibrator catalogs contains few calibrators that have been observed at 22 GHz, however, most of the sky is empty in terms of high frequency VLBI calibrators. We are therefore performing a calibrator search, using the VLA/VLBA/EVN to observe candidate calibrators at 43 GHz. The current standing of our candidate calibrator lists are as follows.
Confirmed 43 GHz VLBI calibrators:
| Source | RA (J2000) | Dec (J2000) | Notes |
| J1745-2900 | 17:45:40.0360540 | -29:00:28.167980 | VLBA cal 22 GHz |
Candidate calibrators selected from the AT20G, KVN-Q calibrator surveys:
| Source | RA (J2000) | Dec (J2000) | Notes |
| J1713-4257 | 17:13:48.1805600 | -42:57:21.266350 | VLA 43 GHz detection, detection short baseline VLBA |
| J1713-3226 | 17:13:50.7901770 | -32:26:12.207430 | VLA 43 GHz detection, detection short baseline VLBA |
| J1717-3342 | 17:17:36.0293360 | -33:42:08.827450352.735 | |
| J1718-2850 | 17:18:49.3796100 | -28:50:41.099570 | Detection short baseline VLBA |
| J1733-3722 | 17:33:15.1930720 | -37:22:32.397530351.477 | |
| J1737-2251 | 17:37:02.0334460 | -22:51:55.387480 | Not detected VLBA |
| J1739-4137 | 17:39:05.5070550 | -41:37:44.123320 | VLA 43 GHz detection |
| J1742-3341 | 17:42:03.6893200 | -33:41:34.404670355.550 | Not detected VLBA |
| J1751-1950 | 17:51:41.3437800 | -19:50:47.504450 | Detection short baseline VLBA |
| J1752-2956 | 17:52:33.1069820 | -29:56:44.898400 | |
| J1753-1843 | 17:53:09.0886250 | -18:43:38.523030 | Short baselines 43 GHz detection VLBA |
| J1807-2506 | 18:07:40.6877050 | -25:06:25.942880 | VLA 43 GHz detection, detection short baseline VLBA |
| J1812-2836 | 18:12:40.1922800 | -28:36:26.940350 | VLA 43 GHz detection, not detected VLBA |
| J1812-0648 | 18:12:50.9219050 | -06:48:23.475940 | |
| J1818-1108 | 18:18:19.3136420 | -11:08:48.320300 | |
| J1819-0258 | 18:19:17.4085740 | -02:58:07.872480 | |
| J1820-1111 | 18:20:22.99 | -11:11:16.50 | Not observed VLBA, VLA 43 GHz detection |
| J1820-0947 | 18:20:38.1071000 | -09:47:17.071000 | |
| J1820-2528 | 18:20:57.8486850 | -25:28:12.584390 | Detection short baseline VLBA |
| J1821-2110 | 18:21:05.4693720 | -21:10:45.248810 | |
| J1821-0502 | 18:21:11.8095250 | -05:02:20.084370 | Not observed |
| J1822-2430 | 18:22:21.0541240 | -24:30:01.318330 | VLA 43 GHz detection |
| J1822-0938 | 18:22:28.7042000 | -09:38:56.835000 | |
| J1825-1718 | 18:25:36.5323050 | -17:18:49.849000 | VLA 43 GHz detection, detection short baseline VLBA |
| J1825-0737 | 18:25:37.6095530 | -07:37:30.013830 | VLA 43 GHz detection |
| J1827-0405 | 18:27:45.0404950 | -04:05:44.578320 | |
| J1828-2123 | 18:28:19.4871390 | -21:23:38.770150 | VLA 43 GHz detection, not detected VLBA |
| J1832-2039 | 18:32:11.0465250 | -20:39:48.202080 | Detection short baseline VLBA |
| J1833-210B | 18:33:39.8396880 | -21:03:41.277670 | VLA 43 GHz detection, detection short baseline VLBA |
| J1835-1513 | 18:35:07.2654760 | -15:13:38.963960 | VLA 43 GHz detection |
| J1837-1532 | 18:37:37.6680360 | -15:32:44.061880 | |
| J1838-1833 | 18:38:37.6916580 | -18:33:55.266660 | Detection short baseline VLBA |
| J1844-1324 | 18:44:50.2816090 | -13:24:44.398210 | VLA 43 GHz detection |
| J1846-0651 | 18:46:06.3002720 | -06:51:27.745850 | |
| J1857-0048 | 18:57:51.3588510 | -00:48:21.937520 | |
| J1902-0458 | 19:02:26.5568600 | -04:58:02.357770 | |
| J1913-0151 | 19:13:39.1256880 | -01:51:47.047600 |