| 256 | | |
| 257 | | If the telescope pointing has gone off by more than about 30 arcsec (which happens!), then |
| 258 | | this routine will likely fail to match stars. If this happens, the operator will need to recenter the telescope. |
| | 256 | To just have mosstat run continuously whenever each image appears, use |
| | 257 | {{{ |
| | 258 | IDL> mosstat_continuous |
| | 259 | }}} |
| | 260 | |
| | 261 | === Correcting the pointing === |
| | 262 | |
| | 263 | Keep an eye on the mosstat output. If the telescope pointing has gone off by more than about 30 arcsec (which happens!), then |
| | 264 | this routine will likely fail to match stars. If this happens, the operator will need to recenter the telescope. One can do this by |
| | 265 | telling the OA to offset the telescope in the *OPPOSITE* direction of the computed mosstat positional offsets, i.e., if you see: |
| | 266 | RA, Dec offsets: -15.230 14.756 |
| | 267 | ask the OA to offset the telescope +15" in RA (i.e., east) and -15" in DEC (i.e., south) and zero the coordinates there. Only |
| | 268 | apply these offsets when the exposure is done (i.e., during readout) and when the telescope is not moving! |
