Last Update: 27th July 2020

Mult PA

A python script enables users to examine when a target is observable at Nobeyama.
  1. After making the source table, type at the prompt in the server,
  2. GUI will be shown. Enter the project name where you made source tables and click OK button.

    Mult-PA GUI
  3. A main GUI will be appeared. "Select tables(EL)" is for making EL-LST diagram for your target(s) (Step 4). You can generate the change of the position angle in the celestial sphere as a function of LST using "Select tables(PA)" (Step 5). These two scrirpts can be used independently or simultaneously.

    Mult-PA Main GUI
  4. If you click "Select tables (EL)", following GUI will be generated. The scripts list the Source Tables in your working directory. Click all Source Table(s) you want to see the EL-LST diagram and then press "Select" button.

    Mult-PA EL
  5. This script cannot plot the rotation angle for multiple Source Tables at once (i.e., only one Source Table is allowed to select). The rotation angle is critical for multi-beam receivers such as FOREST, since rotatable range of the receiver is limited (for example, FOREST can rotate +-100 degrees). 'Initial Angle' is a sum of 'Position Angle' and 'Beam Rotation Angle' in the Scan Table. If your target reaches the limitation of the rotation angle of the receiver, you should modify the Beam Rotation Angle in the Scan Table. Preferable initial angle of the rotator depends on LST range (allocated observation time).

    Note 1: you do not need to modify the position angle in the Scan Table.
    Note 2: FOREST is the only multi-beam receiver available for the open use for the 2017-2018 observing season.

    Mult-PA Position Angle
  6. Click "Plot" button in the main GUI when selection of Source Table(s) is over. Plots of LST-Elevation and Position Angle of your targets will be shown.

    Mult-PA LST-EL Plot
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