Proposal Information

Call for Proposals

The National Astronomical Observatory of Japan invites proposals for the Nobeyama 45-m telescope.

The Nobeyama 45-m telescope is operated by the National Astronomical Observatory of Japan (NAOJ) for centimetre to millimetre wavelengths. In this call for observing proposals, we offer four-beam spectroscopy observations in 80-116 GHz bands and single-beam spectroscopy observations in 20-116 GHz bands. All telescope time will be charged

Ken'ichi Tatematsu
Director, Nobeyama Radio Observatory, National Astronomical Observatory of Japan

Information on the 2023-2024 Observing Season

3000 hours are expected to be available for charged telescope time. Astronomers and researchers in the related fields (including graduate students) are encouraged to submit proposals. Besides, undergraduate students who are already admitted to graduate school can also submit proposals. We only accept proposals written in English.

Applicants are required to refer carefully to the instruction on this web page and Status Report.

1. Charged Telescope Time (Regular) Period
From 1 February 2024 to 31 March 2024
2. Deadline

Semester 2023-C:
1 December 2023, 15:00JST [06:00UT]

This call is for regular programs only. Student programs will not be accepted.

3. Facility Receivers

H22, H40, Z45, and FOREST receivers are available for charged telescope time.
T70 receiver has been decommissioned. NRO opens FOREST receiver for 70 GHz band observations while its Tsys is 20% higher than T70. See status report for detail.

We do not offer the continuum mode for science target observation. The continuum mode is only available for pointing observations.

Important notice: A problem of the SAM45 spectrometer has been found, and its diagnostic is ongoing. The problem is due to a hardware malfunction, and the repair will take more than several months. Until the repair is completed, the NRO provides the observers with 75% of the spectrometer's capacity (Arrays 5-8 and 21-24 are unusable). For the compensation of it, the NRO will allocate the additional 25% observation time for all observers of 2023C (e.g., if you submit 20 hours of telescope time, and it is accepted, you will be get 25 hours).

4. Offered Time Slot

For this call, we offer a total of 570 hours as the observation time.
Breakdown for each LST slot is:


4. Observational Support

We will not provide the observation assistant or supporter. Observer should learn the system from the web. We strongly recommend including those who has enough experience in observations with the 45 m telescope. You may find observers from list of accepted proposals or by searching for NASA ADS with the Keyword 'Nobeyama.' The team including a novice may request allocation of weekday daytime observation or initial weekday daytime practice time, when the observatory staff is stationed.

6. Observing Sites

Observations are carried out at Nobeyama or through remote observations from NAOJ Mitaka, Academia Sinica Institute of Astronomy and Astrophysics (ASIAA) in Taiwan, Korea Astronomy and Space Science Institute (KASI) in Korea, and universities/institutes in Japan*. A preliminary test is needed before your observation even for the sites that are already estabilshed as remote operation sites.

We recommend novice users to observe at Nobeyama-site because observations using limited number of displays and with sllow network responce are sometime harder to see the full picture of telescope status.

*: The remote operation sites established in Japan are as follows:

7. VLBI Observations

Note that a VLBI observation proposal including the Nobeyama 45-m telescope can be accepted only if the Mizusawa VLBI Observatory, NAOJ agrees to support it. Details can be obtained at the Mizusawa VLBI Observatory.

Statistics of requested time for the NRO45m season 2022. Other statistical information is here (users meeting slide).

LST Pressure

Other Notice for Applicants

H22+H40, H22+Z45 Simultaneous observations of H22+H40 and H22+Z45 are offered. We note that system temperature will be slightly higher in the simultaneous observation. Please refer to the status report (Table 1).
Dump time for On-The-Fly mode Dump time for On-The-Fly mode is allowed to be not only 0.1 second but 0.04 second as well. However, there is a limit on the size of the map when using 0.04 second (30 arcmin. ≤ size ≤ 60 arcmin.). Please justify the reason why you need to be observed in 0.04 second in the proposal.
Beam Rotation Angle Inclined-scan mapping from the reference coordinate is NOT allowed for observations with the FOREST receiver. For instance, users can only choose the beam rotation angle of -180, -90, 0, 90, and 180 degrees.
On-On Observation For the On-On observation, applicants can use Beam 1 and Beam 3 of FOREST receiver (beam separation is ∼70 arcsec) instead of the decommissioned TZ receiver.
Proprietary Period By default, data obtained as part of the Nobeyama 45-m charged telescope time are subject to a proprietary period of three years starting when all the observations of each project are complete.
Effect by Automotive Millimetre-Wave Radar Automotive millimetre-wave radar mounted on the car may cause unwanted signals at 76-77 GHz. The observatory suggests users avoid RF setting around 76--77 GHz if possible. Following pdf files represent the results of test observations of receiving automotive millimetre-wave radar emitted from different types of cars: link1 link2
NRO's policy NRO's Policy to Exclude Military Researches. This policy applies to the charged telescope time.

Preparation and Submission

Proposal Preparation Guide: Submission Instructions:

Instrumentation Overview

Instrumentation overview of the Nobeyama 45-m telescope is summarised in the following links:

If Your Proposal is Approved

If your proposal is approved, PI (a delegate) needs to send an observing plan. Observers who will visit Nobeyama or Mitaka need to send a plan at least 2 weeks before your arrival. The observatory will NOT support travel expenses. We offer no service observation.

Instructions for Observers:

A computer account is necessary for your observations. Information on the account will be sent to the principal investigator (or the contact person).


If you have any questions or requests about the open use of the Nobeyama 45-m telescope, please send it to the Helpdesk.
2023-11-01 Last Update