Tidbinbilla Spectroscopy Observation File Generator


Fill out the form below to describe an observation of a single source. A line of an observation file will be produced which can be copied to a final observation file.

Experiment details

Observation code (e.g T002)

Source details

Name (No spaces allowed!)

Position: J2000 RA : J2000 Dec : [help]

Velocity (km/s) or redshift : [help] Velocity type or redshift: [help]

Observing Band :

Correlator configuration: [help]

IF1 Rest Freq (MHz): IF2 Rest Freq (MHz): [help]

Time on source (min): [help]

No 5 sec integrations to average: [help]

Do a boresight? : [help]


Position switch mode [help]

Position offset (arcmin)

Time per position offset (min)


Frequency switching mode Note: Frequency offset applies even if this parameter is set to off.

Frequency offset (MHz) [help]

Time per freequency offset (min)


Doppler tracking? : [help]


Description of parameters

Position. Give RA and Dec in J2000 coords. Use colons to separate hrs, mins, secs and deg, min, sec

Velocity or redshift. LSR or heliocentric velocity (km/s) or redshift

Velocity type or redshift. Specify if the number given is a LSR or heliocentric velocity or a redshift.

Correlator configuration. Note that dual polarisation observations are currently available only at S and X bands.

Rest frequencies. The rest frequency of the spectral line being studied. If only one IF is to be used, set IF2 rest frequency to zero.

Time on source.
For position switching this should be equal to N x sum((number of pointing offsets) x (time per offset)).
For frequency switching this should be equal to 2N x (time per frequency offset).
N is an integer > 0.

No 5 sec integrations to average. The correlatory typically works on a 5 sec integration cycle. To save disk space these cycles may be averaged up before writing.

Do a boresight?

At K-band: If yes then a nearby bright source is used to obtain a pointing solution before observing the target source (takes 5 to 10 min). If a pointing solution has been obtained recently at a nearby (Az,El) then this is used (takes no time). Reccommended.

At other bands: A boresight to obtain global pointing offsets will be done as a matter of course at the start of each time allocation. This should be sufficient so this parameter can be set to "no".

Position switch mode

off = no position switching (stay on source).

4-point = 4 point switching where the offset sequence is (+(offset in RA), on_src, on_src, -(offset in RA)

8-point = 8 point switching where the offset sequence is on a grid in coordinates of x=RA and y=cross-RA where (x,y) = (1,0), (0,0), (0,1), (0,0), (-1,0), (0,0), (0,-1), (0,0) * offset

Frequency offsset (MHz). If frequency switching is on then offsets will be at +/- this value. If frequency switch is offthen a constant frequency offset will be applied to all spectra.

Doppler tracking. If turned on, the observing frequency is adjusted for every on/off or freq1/freq2 pair using either an optical, radio or relativistic definition.


sched_prepare_cgi.pl v0.2.0.
Jim Lovell (Jim.Lovell@csiro.au) 20 December 2003