Curated by: Show Mission Events 2022: Mission Events 2021: Mission Events 2020: Flashback: Timelines: CZ 5B Re-entry - 2021 May 9  Background 2021 April 29 - China launched the core module of it's space station. The launch vehicle was a CZ 5B rocket that also put its own 18 tonne second stage into orbit, setting the scene for the May 9 re-entry of one of the most massive objects since the 40 tonne Salyut 7/Cosmos 1686 combination in 1991. Space Track Space-Track is the main source of orbital data as it publishes timely orbital data of unclassified space objects. One of its services is to provide estimates and, eventually, actual times of re-entry for objects brought down from orbit through air drag. There are other sources for re-entry estimates but they use mainly Space-Track published data and apply their own mathematical models to make a prediction. Starting a few weeks before the event, the Space-Track feed provides an estimate of re-entry date which is updated weekly. For major objects, the Space-Track output switches to issuing 'TIP messages', giving a more precise estimate of date and time and an indication of the expected location on the Earth's surface. The derivation of the acronym 'TIP' is lost in the mists of the 1960s or 1970s. Space-Track has adopted "Tracking and Impact Prediction" but it could equally be something like 'Terminal Impact Point'. Evolution of the Space-Track Estimate Below are extracts from the TIP messages issued by Space-Track between May 5 and May 9 in descending order of date/time issued. Latitude and Longitude represent the location when the object is expected to be down to 10 km altitude. It is an arbitrary measurement with no real significance but serves to indicate the general area.
The steadily narrowing window as time goes by reflects increasing confidence in the prediction. The final entry was issued after the event and the ±1 minute confidence is probably down to the infrared signature of the event being detected from orbit by one or more satellites tasked with monitoring rocket and missile launches. China - Pre-event Notification China's Xinhua News Agency published the following item that emanated from China's Manned Space Engineering Office (CMSO) shortly before the expected impact: "BEIJING, May 9, 02:16 UTC -- China's Manned Space Engineering Office announced today on its official WeChat that at [11:24 UTC] on May 9, 2021, the last stage of the Long March 5B Y-2 carrier rocket had a perigee altitude of about 130 km, an apogee altitude of about 160 km and an inclination of 41.5 degrees. The re-entry time is expected to be [02:12 UTC] ±15 minutes on 9 May, with the re-entry centre at 28.38 degrees east longitude and 34.43 degrees north latitude." China - Wrap Up After the event, there was a further release from Xinhua: "BEIJING, May 9, 03:02 UTC -- According to China's Manned Space Engineering Office, after monitoring and analysis, on May 9, 2021 at [02:24 UTC], the Long March 5B Y-2 carrier rocket last-stage debris re-entered the atmosphere, the landing area is located at longitude 72.47 degrees east, latitude 2.5 degrees north over the sea, the vast majority of debris was destroyed by the re-entry process of ablation. "On April 29, China launched the space station's sky and core module into its intended orbit with the Long March 5 Y-2 carrier rocket at the Wenchang Space Launch Site. The success of the mission marks the full start of the in-orbit assembly and construction of the Chinese space station." Debris Impact Re-entry of the previous CZ 5B launch in 2020 reportedly resulted in debris impacting the ground over Africa so, by inference, some components of this rocket will also have got throught the atmosphere. Any such debris will have impacted the Indian Ocean between the Space-Track location and the location announced by China. Page Date - 2021 May 9 How do you enter latitude and longitude in Google Maps?On your computer, open Google Maps. In the search box, enter your coordinates.. Decimal degrees (DD): 41.40338, 2.17403.. Degrees, minutes, and seconds (DMS): 41°24'12.2"N 2°10'26.5"E.. Degrees and decimal minutes (DMM): 41 24.2028, 2 10.4418.. How do I find a location using latitude and longitude?To find a location using its latitude and longitude on any device, just open Google Maps. On your phone or tablet, start the Google Maps app. On a computer, go to Google Maps in a browser. Then enter the latitude and longitude values in the search field — the same one you would ordinarily use to enter an address.
What is my latitude and longitude?Android: Open Google Maps; it will zoom to your approximate location. Press and hold on the screen to drop a pin marker. Click on the dropped pin; latitude and longitude will be displayed below the map. If you don't have Google Maps, you can install a free GPS app before heading to your site.
Is longitude north or east?Longitude is the measurement east or west of the prime meridian. Longitude is measured by imaginary lines that run around Earth vertically (up and down) and meet at the North and South Poles. These lines are known as meridians. Each meridian measures one arc degree of longitude.
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Longitude 28.38 degrees east and latitude 34.43 degrees north
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