Last Update: 1st February 2017

Notes for This Season

Current SAM45 Status (8th November 2016)

The arrays coloured with red are currently not available. Green indicates available arrays.

A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16

If the sample file you chose in the Device Tab uses any of the unavailable arrays, do not enter the centre frequency (leave it blank) for that particular array.

Introduction: Obstable Z

The "Obstable Z", as known as "zobs", is a Java program that allows the observer to create observing scripts for the 45-m observations. This program is designed for 45-m observations using the SAM45 spectrometer in conjunction with any of the receivers equipped with the 45-m telescope. Those who wish to perform continuum observations including pointing should consult the manual.

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How to Use the Obstable Z

  1. You can not use the Obstable Z from outside of the observatory, otherwise use a VPN.
  2. Login to ut12x1 (or obstable1) from any machine.
    > ssh -X (YOUR ACCOUNT ID)
    > ssh -X -l (YOUR ACCOUNT ID)
  3. After login to ut12x1, type the following command at the prompt.
    > zobs
  4. You will see a window like this. Enter your project name (i.e., proj1, proj2, and so on) in the box.

  5. After a successful login, you should have the following window on your screen.

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Creating Observing Scripts

An observing script for the 45-m telescope, "Observe Table", is made of a combination of 3 files (so-called "tables"): Source Table, Scan Table and Device Table. Each tab in the Obstable Z is designed to make these tables.

  1. Files Tab
  2. Source Tab
  3. Scan Tab
  4. Device Tab
  5. Summary Tab

For Specific Observations

You can make basic observing scripts based on the explanations in linked pages above. Following links are the guides for specific observations.
  1. Starndard Source Observation
  2. Pointing Observation with Continuum Sources

Useful Tools

The observatory provides useful tools for making observing scripts.
  1. Mult PA
  2. You can make an LST-EL (elevation angle) diagram of sources which are defined in Source Table. You can also check the rotation angle (PA) of the rotator of a multi-beam receiver.
  3. Log of Observations
  4. The log of your observations can be obtained via a command line.
  5. Obspoint
  6. Observing points defined in your observing scripts can be checked. This tool is useful not only position switch mode but On-The-Fly mode.
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Instruction on conversion of the observing script for the FOREST receiver

From 2016--2017 observing season, the connection of the backends, SAM45, for the FOREST receiver is changed. The array configuration for the FOREST receiver becomes as follows:

Array Number the Sample Table From 2016--2017 Observing Season
A01 Beam 1 H(1) Beam 1 H(1)
A02 Beam 1 H(2) Beam 1 V(1)
A03 Beam 1 V(1) Beam 2 H(1)
A04 Beam 1 V(2) Beam 2 V(1)
A05 Beam 2 H(1) Beam 3 H(1)
A06 Beam 2 H(2) Beam 3 V(1)
A07 Beam 2 V(1) Beam 4 H(1)
A08 Beam 2 V(2) Beam 4 V(2)
A09 Beam 3 H(1) Beam 1 H(2)
A10 Beam 3 H(2) Beam 1 V(2)
A11 Beam 3 V(1) Beam 2 H(2)
A12 Beam 3 V(2) Beam 2 V(2)
A13 Beam 4 H(1) Beam 3 H(2)
A14 Beam 4 H(2) Beam 3 V(2)
A15 Beam 4 V(1) Beam 4 H(2)
A16 Beam 4 V(2) Beam 4 V(2)

In order to make appropriate observing scripts for the FOREST, please follow the procedure as described below.

  1. Make Observing Scripts as Other Receivers
  2. Please make observing scripts for the FOREST receiver using the Obstable Z as the usual way. They must be made from the sample file for the FOREST receiver.

  3. Modify Observing Scripts
  4. Run a python script to modify observing scripts to fit the physical connection.
    > (path to *.start)
    ~.start file can be found at
    where AcountID is your account ID and projX is the project name you made the observing script (e.g., proj1, proj2, proj3, or proj4). This python script does two following processes:

    When they have already been changed, they will not be converted. If necessary, regenerate with the Obstable Z, or use the --use_orig option and convert to *.orig as above.

  5. Send Observing Scripts to the COSMOS system
  6. With the following command, (re-)send converted observing scripts to the COSMOS system, which controls the Nobeyama 45-m telescope:
    > (path to *.start)
    This script works for all observing scripts in the specified directory.

The array configuration of obtained data is as "From 2016--2017 Observing Season" column in the table above. Please remember it when you see the data on the Quicklook monitor and analyse the data.

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Contact Information

For inquiries, please send your question or request to the helpdesk. If you have trouble, please prepare for your tables (*.source, *.scan, and *.device) and/or screenshot of offending windows of the program to send us.

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