en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System
4 corrections found
The sixth satellite failed to reach its orbit on 22 December 2025.
This mixes up QZS-6 and QZS-5. QZS-6 launched successfully on February 2, 2025 and entered service later that year; the satellite lost on December 22, 2025 was QZS-5.
Full reasoning
Official QZSS and JAXA sources show that QZS-6 was launched successfully on February 2, 2025. The Cabinet Office's QZSS site says QZS-6 was launched that day and was being prepared for service, and later announced that QZS-6's services started on July 18, 2025. Separately, JAXA states that the December 22, 2025 launch failure involved MICHIBIKI No. 5 (QZS-5), not QZS-6. So the article's sentence incorrectly says the sixth satellite failed on that date; the failed satellite was QZS-5.
3 sources
- Preparation Status of QZS-6|QZSS - Cabinet Office (Japan)
QZS-6, launched on February 2, 2025, is currently undergoing parameter tuning and confirmation to start its services.
- みちびき6号機のサービス開始について|QZSS - Cabinet Office (Japan)
2025年2月2日(日)に打ち上げた準天頂衛星システム「みちびき6号機」について、2025年7月18日(金)より下記のサービスを開始しましたのでお知らせいたします。
- Launch Failure of the 8th H3 Launch Vehicle and Setting up a Special Task Force
JAXA launched the MICHIBIKI No. 5, Quasi-Zenith Satellite System (QZS-5) ... on December 22, 2025 ... As a result, QZS-5 could not be put into the planned orbit, and the launch failed.
Last launch 2 February 2025
This is outdated. JAXA records show a later QZSS launch on December 22, 2025, when QZS-5 was launched aboard H3 F8.
Full reasoning
The infobox says the system's last launch was February 2, 2025. But JAXA's launch records list a later QZSS launch: MICHIBIKI No. 5 (QZS-5) was launched on December 22, 2025 aboard H3 F8. That launch failed to place the satellite into its planned orbit, but it was still a launch, so February 2, 2025 is not the system's most recent launch date.
2 sources
- JAXA | Launch Records
12/22/2025 H3 F8 MICHIBIKI No. 5, Quasi-Zenith Satellite System (QZS-5) ... 2/2/2025 H3 F5 Quasi-Zenith Satellite System 'MICHIBIKI No. 6 (QZS-6)'.
- Launch Failure of the 8th H3 Launch Vehicle and Setting up a Special Task Force
JAXA launched the MICHIBIKI No. 5, Quasi-Zenith Satellite System (QZS-5) ... at 10:51:30 on December 22, 2025 ... As a result, QZS-5 could not be put into the planned orbit, and the launch failed.
Total launches 6
This undercounts the number of QZSS launches. By JAXA's records, there had been seven QZSS launches by December 22, 2025.
Full reasoning
JAXA's launch records show QZSS launches on September 11, 2010 (QZS-1), June 1, 2017 (QZS-2), August 19, 2017 (QZS-3), October 10, 2017 (QZS-4), October 26, 2021 (QZS-1R), February 2, 2025 (QZS-6), and December 22, 2025 (QZS-5). That is seven launches in total. The December 2025 launch failed, but it was still a launch and is counted by JAXA in its launch records.
3 sources
- JAXA | Launch Records
12/22/2025 ... MICHIBIKI No. 5, Quasi-Zenith Satellite System (QZS-5) ... 2/2/2025 ... MICHIBIKI No. 6 (QZS-6) ...
- What is the Quasi-Zenith Satellite System (QZSS)?|QZSS - Cabinet Office (Japan)
The first Quasi-Zenith Satellite (QZS-1) was launched on September 11, 2010 ... Subsequently, in FY2021, the successor to the QZS-1R was launched ...
- 各国の測位衛星|QZSS - Cabinet Office (Japan)
QZS02 2017/6/1 ... QZS03 2017/8/19 ... QZS04 2017/10/10 ... QZS1R 2021/10/26 ... QZS06 2025/2/2
It is not seen on the website as of 2026.
This is false. Q-ANPI is clearly listed on the official QZSS website in 2026, including dedicated overview and technical-information pages.
Full reasoning
As of 2026, Q-ANPI is plainly visible on the official QZSS website. The English service overview menu includes “QZSS Safety Confirmation Service (Q-ANPI)”, and the dedicated service page describes how Q-ANPI works and where it can be used. There is also a separate public Q-ANPI site. So the statement that Q-ANPI is 'not seen on the website as of 2026' is contradicted by the official website itself.
3 sources
- Service Overview|QZSS - Cabinet Office (Japan)
Service Overview ... QZSS Safety Confirmation Service (Q-ANPI)
- QZSS Safety Confirmation Service (Q-ANPI)|QZSS - Cabinet Office (Japan)
Discussions are underway for using the QZSS Safety Confirmation Service (Q-ANPI) ... This service is available on S-band devices that support Q-ANPI.
- 衛星安否確認サービス -TOP-
衛星安否確認サービス(Q-ANPI) ... 個人利用はこちら ... 利用機関はこちら