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So, uh, with one just launched a few hours ago and the big launch of their Space Station in 2 days, the Chinese...still have other thingys to put into orbit *this week*. Specifically April 30 ~07:25 UTC from Jiuquan. But trying to nail down even the basics is proving futile...pic.twitter.com/QZqdr5pWVo
For one thing the one air-space closure zone seems to indicate a 63 deg. LEO/NOSS-type/Molniya orbit, also that YW-6 tracking ship is btw Java & W Australia right now, but the locations doesn’t quite match w/ the YG-31 series launches this year.
It “should” be a LM-4C given tracking ship involvement, but the location is weird (positioning suggesting ~70 deg. orbit) that 2C/2D/4B can’t be ruled out.
No known S/C can be paired to this.
So uhh w/ the zones for CSS Tianhe launch still 404 it’ll remain a mystery for now. 
...and yup the Chinese are going back into stealth mode immediately tomorrow:https://twitter.com/Nextlaunch/status/1387631224815034371?s=19 …
：38th UP!
：Friday
：0719-0743 UTC / 3:19-3:43 EDT / 16:19-16:43 JST
：Long March 
：
：
：LEO
：
：https://forum.nasaspaceflight.com/index.php?topic=53688.0 …
：http://free.timeanddate.com/countdown/i66vszuf/cf12/cm0/cu4/ct0/cs0/ca1/co0/cr0/ss1/cac090/cpc000/pc000/tcfff/fn1/fs400/szw576/szh300/iso2021-04-30T07:19:00/bo2/pd2 …And...launch success confirmed. It was indeed a Long March 4C launching at 07:27 UTC w/ a certain "Yaogan 34", described as an optical remote-sensing satellite built by SAST. http://t.cn/A6cnB5ha
This launch puts the obscure (due to its payload usually classified or plain civil domestic EO sats) Long March 4 series at 6 out of 6 in 2021 so far, just 1 short of Soyuz and firmly in 3rd place for usage frequency. Official reports has it flying "around 14 times" this year.pic.twitter.com/bBuuXGrlzo
This is also the first LM-4 series launch from Jiuquan using the larger 4 m diameter payload fairing. Previously such launches were all from Taiyuan.pic.twitter.com/KJ80aqzJ1t
Regarding the destination of the satellite, there were speculations of it making a dogleg to SSO, however there's an observation of what looks like rocket stage venting in New South Wales Australia ~30 min later which fits w/ this one & in ~60 deg. LEO. http://satobs.org/seesat/Apr-2021/0169.html …
Tracking data from @18SPCS:
2021-037A/48340: 1083 x 1105 km x 63.38° (S/C)
2021-037B/48341: 983 x 1091 km x 63.45° (rocket)
Interesting orbit for an optical EO sat, and even more interestingly YG-34's co-orbital w/ the YG-31-01 triplet "Chinese NOSS" satellites! I wonder... 
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