Jonathan McDowell Profile picture
Sep 15, 2020 5 tweets 1 min read Read on X
China launched a Chang Zheng 11 at 0123 UTC, placing 9 satellites in sun-sync orbit. The satellites are all in Changuang Satellite Tech's Jilin-1 constellation: three video sats (Jilin-1 GaoFen 03C 01 to 03 xing) and six pushbroom imager sats (Jilin-1 GaoFen 03B 01 to 06 xing)
The CZ-11 was launched from a barge called 德渤三号 (Debo-3), which sailed from the new Shandong Eastern Spaceport at Haiyang.
This is the second CZ-11 sea launch; the previous flight in 2019 was a test using a different barge, the Tai Rui, before the Eastern Spaceport was opened.
Here's the CZ-11 launch Image
And here's the ship in port during a test raising the rocket to vertical. Can anyone geolocate? I took a look at Haiyang harbor but haven't found that dock. Image

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Jonathan McDowell

Jonathan McDowell Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @planet4589

May 29, 2023
The planned trajectory of the North Korean satellite launch, as estimated by me based on debris warning areas, passes 500 km above the Okinawa region - higher than the International Space Station. The only landmass it goes directly over is the uninhabited island of Irisuna-jima. Image
It is possible that the second stage could shut down early, or that the yaw manuever prior to stage 2 ignition could go off course, so it is not completely *impossible* for debris from the launch to hit the Okinawa region. But it is very, very unlikely.
Thus, I consider Japanese goverment hyperventilation about the launch to be rather excessive.
Read 4 tweets
May 29, 2023
Thanks to a tip from @martyn_williams I took a look at the warning areas for the upcoming (NET May 31) North Korean recon sat launch.
The map below shows the launch site, polygonal warning areas and (orange lines) my fit to the trajectories. (1/n)... Image
@martyn_williams I think the first and second warning areas correspond to first stage and nose fairing impact zones, and correspond to a -5650 x 150 km x 93.9 deg (sub)orbit (apogee not well constrained).
@martyn_williams Then the second stage makes a 'dog leg' yaw change to head southeast, firing at 1st stage apogee to a -5240 x 500 km x 75.7 deg orbit with impact east of the Phillipines. This trajectory has an apogee over 127.1E 26.1N.
Read 5 tweets
Jan 8, 2023
On Tuesday at 2pm I'll be in room 205 for the "Space as an Environment" splinter session which will include an update on the issue of satellite constellations affecting ground based astronomy
That topic will be continued on Wed at 10am, room 201/202, for the "Space as an Environment" open house, where I'll be tabling and available for informal discussion about the satcon and other space env issues #AAS241
On Wed at 12.45 at the AAS reg desk I invite alumni of the SAO Astronomy Summer REU to join me for our traditional networking lunch expedition, actual eating venue still TBD #AAS241
Read 4 tweets
Jan 6, 2023
The Japanese space agency JAXA is preparing to deploy 3 cubesats from the ISS.
The cubesats are stored in the J-SSOD #24 deployer, which was brought to ISS on Dragon CRS-26 and transferred internally to the Kibo module.
The Japanese JRMS robot arm has extracted J-SSOD #24 from the Kibo airlock and is now holding the deployer out against the direction of ISS motion so that the ejected sats will not recontact ISS.
The first sat to be ejected will be the 1U test satellite SS-1 (SuryaSat) from Surya University in Jakarta.
Read 5 tweets
Dec 19, 2022
OK, it's Sunday night and I'm going to get technical on you.
You may be familiar with the Lagrange Points - specifically Sun-Earth L1 and L2 (SEL1 and SEL2), which are 1.5 million km towards noon and towards midnight respectively.
As the Earth goes round the Sun, L1 and L2 travel with it. So if you define a coordinate system which rotates around the Sun with the Earth, the L1 and L2 points are fixed in that system. One such system is GSE: Geocentric Solar Ecliptic.
Read 15 tweets
Dec 16, 2022
LAUNCH of Falcon 9 at 2248 UTC Dec 16 from Cape Canaveral LC40 with two O3b-mPOWER communications satellites
20 first-gen O3b satellites were launched to 8000 km equatorial orbits in 2013 to 2019. They had a mass of 700 kg.
The new O3b mPOWER sats are Boeing 702X satellites with a . mass of 1700 kg each. I believe their size is around 1.5 x 3.0 x 3.0 m with about 27m solar panel span
Correction, O3b-mPOWER mass may be 2050 kg each, based on info in @SpaceflightNow 's coverage
Read 6 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us!

:(