This section summarizes some features of the CCDSH installation at the 1-m Ritchie-Crétien-Coudé telescope (RCC, for short) of the Konkoly Observatory at Piszkéstető mountain station, after the general refurbishment of the whole system. Here we summarize the commands specific to the RCC telescope.
The telescope (and some of its instruments, e.g. the spectrograph) control can be reached through the computer
m5. The Andor EMCCD is controlled by
m16. For the necessary accounts, please contact the system admins.
Global startup script
The global startup script of the PRCC system is:
set verbosity 1 set xpa on set epoch 2000.0 set location longitude=+19:53:54 latitude=+47:55:08 timezone=local set location fixed module mod_criorcc.so criorcc -t on module mod_resolv_sesame.so module mod_resolv_mpc.so module mod_resolv_natsat.so module mod_imexam.so module mod_staralt.so
For the explanation of each command, see the main documentation of the CCDSH package.
Commands and issues specific to the RCC telescope
Additional information on the status of the telescope can be seen using the
rcc status command resulting in:
CRIO FPGA status: normal (0) RCC mount limitations: normal RCC mount status: idle RCC mount configuration: east RCC dome status: idle RCC dome slit: closed RCC covers: tube: closed RCC covers: mirror: closed RCC finder cap: closed RCC guider cap: closed RCC mount speed: 6000.0 (arcsec/sec) = 1.6667 (deg/sec)
Sidereal tracking is turned off by default,
and also stops when exiting
ccdsh. Note that the closing slit or
rotating dome also halts in this case. The tracking can be turned
on/off with the regular
set mount track on|off command.
Instead of the
set dome auto on|off command, the automatic tracking of the dome can be controlled with the
rcc dome auto|manual sequence. Note that the regular
set dome auto on|off is also accepted without error messages but currently results in nothing.
The dome shutter can be opened with the usual
set dome slit open|close command. To rotate the dome, the
set dome azimuth=value command can be used, strictly after giving the
rcc dome manual command.
The home position of the dome is around
azimuth=156.3. This way the slit can be seen on the image of the internal camera.
Tube and mirror covers
The tube and mirror covers can be controlled via the
rcc tubecover|mirrocover open|close scheme. For instance, the mirror cover is opened by the command
rcc mirrorcover open
The lights in dome (not the flat lamps, however this command is used to control the flat lamps at the PSCH!) are controlled with the
set dome light 1 on|off sequence. Note that the lights are also controlled with an alternating switch in the dome, therefore the required parameter (
on|off) depends on the position of the switch.
Flat lamps and flat position
The flat lamps can be controlled outside of
ccdsh with the
energenie-manage --flat-bright on|off energenie-manage --flat-faint on|off
To align the flat screen and the telescope, rotate the dome to the home position:
set dome azimuth=156.3, and then move the telescope to the flat position:
rcc slew 7 -4.5. Do not forget to stop the mount when you make dome flats!
Observing in upper position
The telescope control can currently slew automatically to targets in its lower position. The telescope can be positioned to the upper position manually using raw coordinates by the
rcc slew command. To do this, calculate the raw coordinates - hour angle and declination - in degrees: tau+180, 180-dec, i.e. the coordinates of the base position will be (180, 132). To calculate the actual hour angle, you can use H.A.=(ST*15-RA*15)+180. To position the telescope to a given target, e.g. PV Cep:
CCD> resolve "PV Cep" "PV Cep" ra=20:45:53.94 dec=+67:57:38.6 epoch=2000.0 CCD> date LD=2015.06.18 LT=22:22:39.6 UT=20:22:39.6 JD=2457192.349069 ST=15:29:16.4 CCD> rcc slew 101 112
After the first positiononing, you might want to iterate with the actual sidereal time and hour angle.
In case of any malfunction, use the
criorcc -l -o filename command to save the debug messages to the file specified. A typical output of the above command looks like this:
54378 1408415583.029 -8201 81.0883 -0.01399 54379 1408415583.237 -8201 81.0638 0.02453 54380 1408415583.445 -8201 81.0760 -0.05012 54381 1408415583.653 -8201 81.0760 -0.02642 54382 1408415583.861 -8201 81.0638 -0.00371 54383 1408415584.069 -8201 81.0730 -0.05808 54384 1408415584.277 -8201 81.0638 -0.00569 54385 1408415584.485 -8201 81.0577 -0.00159 54386 1408415584.696 -8201 81.0638 -0.00654 54387 1408415584.901 -8201 81.0638 0.00126
The third column indicates the type of the error. 0 means nothing went wrong. Also, the output of the commands
rcc gps and
get mount position should be copied into a file.
After finishing observations, the RCC telescope can be shut down using the following commands. First, turn off the automatic dome tracking by
rcc dome manual
Then, stop the sidereal tracking using
set mount track off
Then, move the telescope into its home position:
rcc slew 0 47.8
This basic slew command expects an hour angle and a declination value, both in degrees. This position is hence the zenith at the latitude of the observatory.
The dome can be rotated to the flat position, then even the dome webcameras will clearly see the dome slit. The dome flat position corresponds to a slit position to somewhere northwest, more precisely,
set dome azimuth=156.3
The mirror cover, tube cover and dome slit can then be closed:
rcc mirrorcover close rcc tubecover close set dome slit close
Use the commands
rcc status to ensure that everything has properly been closed.
- The above sequence can safely be re-ordered based on the needs of the observer and/or other conditions (e.g. weather, etc.)
- It is recommended to close the mirror cover first, then the tube cover, then the dome slit.
- Sometimes when the dome slit is closed, the RCC motion controller (CRIORCC) goes to an error state (see
rcc status). This error prevents further slewing of the telescope. Use the command
criorcc --clearerrtwice in order to resolve this issue.
- Use the interal dome webcameras to ensure that the dome slit is closed.