NASASpaceFlight.com Forum
International Space Flight (ESA, Russia, China and others) => Chinese Launchers => Topic started by: mikezang on 06/30/2023 06:26 am
-
The NOTAM for Xichang. (https://forum.nasaspaceflight.com/index.php?topic=57867.msg2501421#msg2501421)
-
Is this NOTAM still active?
-
Is this NOTAM still active?
Yes (although it's active 17:00 - 21:00 UTC, August 11-14).
BTW you can check it from here (https://notams.aim.faa.gov/notamSearch/) by searching through "Free Text" (e.g. P3120/23, Q1638/23) and see if it's there. If not, you can check via "Archive Search", select the date of posting (e.g. 2023-06-30) and Flight Information Region (e.g. RJJJ) and see if it's cancelled or not.
-
Is this NOTAM still active?
BTW you can check it from here (https://notams.aim.faa.gov/notamSearch/) by searching through "Free Text" (e.g. P3120/23, Q1638/23) and see if it's there. If not, you can check via "Archive Search", select the date of posting (e.g. 2023-06-30) and Flight Information Region (e.g. RJJJ) and see if it's cancelled or not.
Great, thanks!
-
The payload is Ludi Tance-4A (陆地探测四号A) and luanch number is Y92.
-
The payload is Ludi Tance-4A (陆地探测四号A) and luanch number is Y92.
Since the "LTDC" series current has only 2 known satellites - LTDC-1A & B = L-SAR-01A & B, the 2 L-band SAR satellites launched early 2022, I wonder if LTDC-4A is = "20 m resolution high orbit SAR satellite" mentioned in CASC's Bluebook of China Aerospace Science and Technology Activities 2022, released this January. It certainly fits the literal meaning of "LTDC" - "Land Probing".
https://twitter.com/AJ_FI/status/1616035599999471616
-
China NOTAMs issued! (https://forum.nasaspaceflight.com/index.php?topic=57867.msg2512503#msg2512503)
-
The A2214/23, A2215/23, and A2216/23 removed! this luanch might be delayd or canceled! (https://forum.nasaspaceflight.com/index.php?topic=57867.msg2513455#msg2513455)
-
The A2214/23, A2215/23, and A2216/23 removed! this luanch might be delayd or canceled! (https://forum.nasaspaceflight.com/index.php?topic=57867.msg2513455#msg2513455)
A3711/23 also removed
-
The A2214/23, A2215/23, and A2216/23 removed! this luanch might be delayd or canceled! (https://forum.nasaspaceflight.com/index.php?topic=57867.msg2513455#msg2513455)
A3711/23 also removed
P4191/23 removed, too.
-
Rescheduled for today according to https://forum.nasaspaceflight.com/index.php?topic=57867.msg2513716#msg2513716
-
Rescheduled for today according to https://forum.nasaspaceflight.com/index.php?topic=57867.msg2513716#msg2513716
The new NOTAMs issued! (https://forum.nasaspaceflight.com/index.php?topic=57867.msg2513723#msg2513723)
-
Today is August 12th, not 13th, date in thread title has been wrongly updated today ;)
-
Today is August 12th, not 13th, date in thread title has been wrongly updated today ;)
You're right, I just confused UTC and local time.
-
Waiting for news from Xichang...
-
Launched:
https://weibo.com/5386897742/Nej37Ai0O
8月13日1时26分，长征三号乙运载火箭在西昌卫星发射中心点火升空，随后成功将陆地探测四号01星送入预定轨道，发射任务取得圆满成功。（高剑 摄）
At 1:26 on August 13, the Long March 3B carrier rocket was ignited and lifted off at the Xichang Satellite Launch Center, and then successfully sent the Land Probe 4-01 satellite into the predetermined orbit, and the launch mission was a complete success. (Photo by Gao Jian)
-
Please note the English version of the name.
https://english.news.cn/20230813/73448a8a70c54177abe97724a8354889/c.html
China launches new satellite
Source: Xinhua Editor: huaxia 2023-08-13 02:43:15
XICHANG, Aug. 13 (Xinhua) -- China on early Sunday sent a new satellite into space from the Xichang Satellite Launch Center in southwest China's Sichuan Province.
The satellite, L-SAR4 01, was launched at 1:26 a.m. (Beijing Time) by a Long March-3B carrier rocket, and entered its planned orbit successfully.
The satellite will be mainly used to provide remote sensing information services.
The launch was the 483rd flight mission of the Long March carrier rocket series.
-
Launch image...
-
The launch did occur at 17:26 UTC and was successful, including the given payload name! We are still waiting for what the satellite really does.
https://twitter.com/Cosmic_Penguin/status/1690434018876309505
-
我国成功发射陆地探测四号01星 (https://www.cnsa.gov.cn/n6758823/n6758838/c10088900/content.html)
my country successfully launches Land Probe No. 4 01 satellite
Land Probe 4-01 satellite is a remote sensing scientific research satellite in the "National Civil Space Infrastructure Medium and Long-term Development Plan (2015-2025)". The satellite operates in an inclined geosynchronous orbit, and the synthetic aperture radar payload carried has the advantages of high resolution, wide coverage, multi-mode, and light weight. Compared with low-orbit satellites and optical satellites, this satellite combines the advantages of short high-orbit observation revisit period and wide imaging width with the advantages of microwave observation that are not limited by climate (all-weather) and light (all-day) , can improve the identification accuracy and efficiency of disaster abnormal change information, and enhance the comprehensive prevention and control capabilities of natural disasters. After the satellite is launched into orbit, it will enrich the means of observation in key areas of our country. It will be able to conduct all-weather and all-weather observations of my country's mainland and surrounding areas, and meet the needs of disaster prevention and mitigation, earthquake monitoring, land and resources survey, and marine, water conservancy, meteorology, agriculture, Environmental protection, forestry and other industry application requirements.
This is a IGEO sat.
-
https://twitter.com/cnspaceflight/status/1690458685653602304
🚀 A Long March 3B launched LuDiTanCe-4-01, world's first SAR satellite in (inclined) geosynchronous orbit, from Xichang at ~17:26UTC on August 12.
-
This paper considers the different requirements and determined in the conclusions to design a GSO L-Band SAR satellite inclined 53 degrees to the equator: https://www.sciencedirect.com/science/article/pii/S2667325821000674 (https://www.sciencedirect.com/science/article/pii/S2667325821000674)
https://twitter.com/cosmic_penguin/status/1690479990901809152
-
https://twitter.com/cnspaceflight/status/1690486913621508096
Mission patch
-
https://twitter.com/CNSpaceflight/status/1690570684475600896
-
Pixel counting using a third stage diameter of 3.0 m, I get 4.15 m for the fairing, which indicates this is a CZ-3B/G3 with a 4.2 m fairing (the CZ-3B/G2 has a fairing diameter of 4.0 m).
-
The number is Y92.
-
https://youtu.be/9im0Cw5AivM
-
https://twitter.com/tskelso/status/1690500229475487744
CelesTrak has GP data for 1 object from the launch (2023-120) of L-SAR4 01 atop a Long March-3B rocket from Xichang Satellite Launch Center on Aug 12 at 1726 UTC: english.news.cn/20230813/73448…. Data for the launch can be found at: https://celestrak.org/NORAD/elements/table.php?INTDES=2023-120
-
I think in the foreground we see LC3 and the launch was from LC2.
-
They call him GEOSAR.
Is this the long awaited GEOSAR ?
-
https://twitter.com/cnspaceflight/status/1690912736149217280
Allegedly a spent Long March 3B stage made a fireball over Huaihua, Hunan
video from Douyin
-
High-orbit synthetic aperture radar satellite enters operational orbit (https://news.cgtn.com/news/2023-08-21/World-s-first-high-orbit-SAR-satellite-enters-operational-orbit-1mrMskM6OVq/index.html)
-
A wild guess to what the ground resolution is. Ideal resolution for a fixed mirror is given by
d = 2*R*tan(1.22*c*180/(2*f*D*pi))
d = ground resolution (km)
R = distance to ground (at best 35,786 km)
c = speed of light (299,792,458 m/s)
f = frequency (guess about 40 GHz. the upper edge of Ka band)
D = antenna diameter (guess about 15 m)
which gives d = 22 km. As SAR is being used, the resolution should be a lot better, but I don't know how to calculate that.
-
Satellite LAN could be 90°E
-
Satellite LAN could be 90°E
Confirmed with last TLE from SpaceTrack at epoch Aug 22, 23:11 UTC
LUDI TANCE-4 01A geostationary at 89.2°E inclined orbit: 16.1°
-
An image of the spacecraft: