Last Update: 17th November 2015
Enter your Source table name.
Usually the name of your target source.
The file will be saved at your working directory.
For example, your account ID, project name, and source name are "newobs", "proj1" and "OrionKL", respectively,
your file is saved at
As other tables, file name is put some restrictions.
For Source Table,
- the file name should be shorter than seven charactors.
- the first letters of file names should be one of alphabetical letters.
The subsequent letters should be composed of alphanumeric, plus sign, and minus sign.
- Source Name
The name of your source.
If you are observing a solar system object, then enter the name of your planet here,
and enter fake coordinates into the RA/DEC (i.e. 00 00 00, 00 00 00).
For sources with large radial velocities:
if you are using both sidebands of 2SB receivers, your data in the upper-sideband will be truncated
(by ~40MHz for 1000 km/s, ~200MHz for 5000 km/s, ~400MHz for 10000 km/s at 100GHz) due to Doppler correction.
To avoid this, set your radial velocity to zero and enter the redshifted frequencies in the device table.
- Source Velocity Definition
The velocity definition (radio or optical).
Note: the definitnion of velocity differs from radio to optical due to the method of approximation of the Doppler shift.
Velocity is represented in optical reign as
where c is the speed of light, λ0 the unshifted wavelength, f0 the unshifted frequency,
λ the shifted wavelength and f the shifted frequency, respectively.
In this equation, z is the redshift defined as
On the other hand, radio astronomers adopt different convention to define the velocity as,
The velocity frame (LSR [Local Standard of Rest] or Heliocentric)
- RA/L and DEC/B
Your source coordinates defined in units specified in the "definition" selection.
If you chose L/B coordinates, make sure your off-point (or sky for the on-on mode) coordinates are defined in the L/B coordinates in the Scan Table as well.
Format: e.g. 12 33 43.22
- Source Coordinate Definition
Choose RA/Dec or L/B.
Your choice is J2000 or B1950.
SiO Maser List
Pointing accuracy of the 45-m telescope should be checked every 1-1.5 hours.
This can be done with the observation of SiO maser most of which are emitted from late-type stars (variable stars).
Obstable Z provides a list of available SiO(J = 1-0) maser sources at 43 GHz, which can be used for pointing.
If all SiO maser sources which are near your target are weak, you may try to observe continuum source for pointing.
Pointing observation with continuum source can be explained in here.
- Load SiO List
The "Load SiO List" button will load this list.
You can then select a maser source by clicking a source given in the table.
The information will be copied to the relevant area in the source table.
If you input the name of the SiO maser or their character substring (with case ignored) in the right side of text box and push the "Search" button,
the target will be automatically selected (if it exists).
This function should be useful if you already knew the name of the SiO maser you are going to use
(for example, you have used the SiO maser in previous season).
The "Sort" button enables you to select the SiO maser which suits your aim.
You can limit the SiO maser with ranges of its right ascension and declination and/or its intensity.
Pushing the "Sort" button after input these values in text boxes, and the list of the SiO masers are sorted according to these values.
Although the observatory observe SiO masers within a year, intensity of the SiO masers may vary form the values in this list.