Last Update: 25th December 2018
The scan table prescribes the movement of the Nobeyama 45-m telescope. For continuum observations, the Nobeyama 45-m telescope can observe the target object with only one scan pattern, Cross Scan, which is mainly for pointing observations.
Enter a name for the scan table. A configuration file will be saved under your working directory with the name of
<the name of the Scan Table you defined>.nscan
The limitations of a filename of the scan table are as follows:
NOTE: You can save the input parameters anytime you want (the nobs allows you to save the scan table even if some mandatory fields still blank). The nobs does not check whether these input parameters follow the rules at that time.
Click the Check button for a basic check of the parameters. This feature only checks for simple typos, and it is not meant for checking the details of the observational setup.
You can use this space to leave any memo about the scan table. A character limit is 100, and a line break is prohibited.
Currently, the scan pattern that can be made with the 'nobs' is only 'Cross Scan'.
This mode allows the user to create an observing script for a pointing observation.
Choose the observation type. If you observe a continuum source to check pointing accuracy, select 'pointing'. Otherwise, please choose 'non-pointing'.
Select the coordinate system. 'Equatorial (J2000)', 'Equatorial (B1950)', 'Galactic', and 'Horizontal' are available. If you are going to perform pointing observations with a continuum source, please specify 'Horizontal'.
Length along the scan direction (both X and Y). For pointing observations, the observatory recommends 2 arcminutes.
Enter on-source integration time per one scan (in seconds). A recommended value is 10-15 seconds.
Duration of approach-run. During approach-run, the telescope is acceralated until the speed that equals to the Scan Length per Integrated Time. Unless the Scan Length is too long (∼1 degree), 2 seconds are recommended.
Duration of transit-run. Time for changing the scan direction (X to Y, and vice versa). Unless the Scan Length is too long (∼1 degree), 2 seconds are appropriate.
Position angle of the map (XY coordinates) from the reference coordinate.
Enter the total number of times you would like repeat the cross scans.
As other scan methods for line observations, the total number of scans (i.e., X- and Y-Scan, Off-position, R, and Sky) is limited less than 1000.
Select a calibration system for the absolute intensity calibration. For continuum observations, you can only choose "LD1-SKY".
This field sets the integration time for the absolute intensity calibration process. This value should be equal to a sum of the Integration Time, Approach Time, and Transit Time defined in the Scan Parameters.
This field defines how often the telescope performs the absolute intensity calibration. Set this value so that the interval is 10-15 minutes under typical weather conditions. Although frequent calibration makes observation efficiency low, a shorter interval may be better under highly variable weather conditions.