-
#60
by
GewoonLukas_
on 26 Apr, 2024 15:46
-
L-1 Weather Forecast. 75% GO for April 28th UTC. 80% GO for April 29th UTC. All Additional Risk Criteria are Low.
-
#61
by
GewoonLukas_
on 26 Apr, 2024 21:45
-
SpaceX is targeting Saturday, April 27 at 8:34 p.m. ET for a Falcon 9 launch of the European Commission’s Galileo L12 mission to medium Earth orbit from Launch Complex 39A (LC-39A) at Kennedy Space Center in Florida. If needed, there is a backup opportunity on Sunday, April 28 at 8:30 p.m. ET.
A live webcast of this mission will begin on X @SpaceX about 10 minutes prior to liftoff. Watch live.
Due to the additional performance required to deliver the payload to medium Earth orbit, this mission marks the 20th and final launch for this Falcon 9 first stage booster, which previously launched GPS III-3, Turksat 5A, Transporter-2, Intelsat G-33/G-34, Transporter-6, Intuitive Machines IM-1, and 13 Starlink missions.
B1060-20 to be expended, as we previously learned. https://www.spacex.com/launches/mission/?missionId=galileol12https://twitter.com/i/broadcasts/1gqxvQXrWvzJB
-
#62
by
jcm
on 26 Apr, 2024 22:06
-
-
#63
by
GWR64
on 26 Apr, 2024 22:21
-
Timeline on https://www.spacex.com/launches/mission/?missionId=galileol12
stops at fairing deployment - wtf? This is not a secret mission!
Yes, now SpaceX is starting to do it too!
I'm interested, are there 2 or 3 upper stage ignitions?
with 2 ignitions is a little shorter,
with 3 ignitions the contact with ground stations may be better? and the satellites can be released over the northern hemisphere
-
#64
by
Galactic Penguin SST
on 26 Apr, 2024 22:33
-
Timeline on https://www.spacex.com/launches/mission/?missionId=galileol12
stops at fairing deployment - wtf? This is not a secret mission!
Yes, now SpaceX is starting to do it too!
I'm interested, are there 2 or 3 upper stage ignitions?
with 2 ignitions is a little shorter,
with 3 ignitions the contact with ground stations may be better? and the satellites can be released over the northern hemisphere
I suspect SpaceX isn't the one requesting it...
Could it be a customer's request? This EU deal of launching them from Florida is quite a secret one (certainly the European Commission's Galileo team never officially reported this launch contract IIRC, at least not with a press release) and I wonder if part of the deal to launch them in the US includes this.
-
#65
by
rocketenthusiast
on 26 Apr, 2024 23:46
-
Timeline on https://www.spacex.com/launches/mission/?missionId=galileol12
stops at fairing deployment - wtf? This is not a secret mission!
Yes, now SpaceX is starting to do it too!
I'm interested, are there 2 or 3 upper stage ignitions?
with 2 ignitions is a little shorter,
with 3 ignitions the contact with ground stations may be better? and the satellites can be released over the northern hemisphere
they need 3 ignitions because it is going to MEO direct so one to bring it to leo 1 to bring to MTO and one to circularize at MEO
-
#66
by
cpushack
on 27 Apr, 2024 03:18
-
The EU considers Galileo to be a highly secret program with many classified technologies involved. Brexit caused quite the problems as part of the Satellites were built in England, whom no longer has security clearance as a non-EU country.
Video of Stage 2 is not going to give away any secrets but they must maintain the 'our stuff is super secret' at least for the sake of pride I guess
-
#67
by
ZachS09
on 27 Apr, 2024 03:43
-
https://space.skyrocket.de/doc_sdat/galileo-foc.htmRunning this mission through Orbiter 2016, I did a double M-Vac burn profile with the first burn inserting the Galileo satellites into a transfer orbit of 200 by 23,522 kilometers inclined 56 degrees. That's assuming the operational orbit is at 23,616 kilometers inclined 56 degrees.
Then, the second burn to circularize the orbit occurs at around T+3 hours, 33 minutes (in this case, it'll be 04:07 UTC on April 28th). That's followed by payload separation five minutes later over the Indian Ocean (southern hemisphere).
...
Now, I understand it's said that three burns may be utilized. But I thought the above-mentioned profile would make sense.
-
#68
by
Ron Lee
on 27 Apr, 2024 04:07
-
Folks along the US eastern seaboard and TBD distance inland may be able to see jellyfish effects from the second stage. If the first second stage burn is longer than usual then the northern extent of jellyfish visibility may be improved.
-
#69
by
cpushack
on 27 Apr, 2024 04:19
-
https://space.skyrocket.de/doc_sdat/galileo-foc.htm
Running this mission through Orbiter 2016, I did a double M-Vac burn profile with the first burn inserting the Galileo satellites into a transfer orbit of 200 by 23,616 kilometers inclined 56 degrees. That's assuming the targeted orbital altitude is 23,616 kilometers.
Then, the second burn to circularize the orbit occurs at around T+3 hours, 34 minutes (in this case, it'll be 04:08 UTC on April 28th). That's followed by payload separation five minutes later over the Indian Ocean (southern hemisphere).
...
Now, I understand it's said that three burns may be utilized. But I thought the above-mentioned profile would make sense.
3 hours likely would need the long endurance mission kit (grey interstage)
Perhaps 3 burns makes that not needed?
-
#70
by
ZachS09
on 27 Apr, 2024 04:27
-
https://space.skyrocket.de/doc_sdat/galileo-foc.htm
Running this mission through Orbiter 2016, I did a double M-Vac burn profile with the first burn inserting the Galileo satellites into a transfer orbit of 200 by 23,522 kilometers inclined 56 degrees. That's assuming the operational orbit is at 23,616 kilometers inclined 56 degrees.
Then, the second burn to circularize the orbit occurs at around T+3 hours, 33 minutes (in this case, it'll be 04:07 UTC on April 28th). That's followed by payload separation five minutes later over the Indian Ocean (southern hemisphere).
...
Now, I understand it's said that three burns may be utilized. But I thought the above-mentioned profile would make sense.
3 hours likely would need the long endurance mission kit (grey interstage)
Perhaps 3 burns makes that not needed?
It's the gray band around the second stage's RP-1 tank, FYI. The interstage is unchanged.
Anyway, I think the Mission Extension Kit will be implemented given the long duration of this mission.
-
#71
by
rocketenthusiast
on 27 Apr, 2024 04:43
-
Running this mission through Orbiter 2016, I did a double M-Vac burn profile with the first burn inserting the Galileo satellites into a transfer orbit of 200 by 23,522 kilometers inclined 56 degrees. That's assuming the targeted orbital altitude is 23,522 kilometers.
Then, the second burn to circularize the orbit occurs at around T+3 hours, 34 minutes (in this case, it'll be 04:08 UTC on April 28th). That's followed by payload separation five minutes later over the Indian Ocean (southern hemisphere).
...
Now, I understand it's said that three burns may be utilized. But I thought the above-mentioned profile would make sense.
going direcly into a 23522 km by 200km orbit from stage seperation in 1 burn is super inefficient and wastes a lot of delta v! I don't know if they even have the performance for that! even o3b which goes into a ~2500 by 8000km orbit has 3 burns! there is no way this has 2
-
#72
by
ZachS09
on 27 Apr, 2024 04:54
-
https://space.skyrocket.de/doc_sdat/galileo-foc.htm
Running this mission through Orbiter 2016, I did a double M-Vac burn profile with the first burn inserting the Galileo satellites into a transfer orbit of 200 by 23,522 kilometers inclined 56 degrees. That's assuming the operational orbit is at 23,616 kilometers inclined 56 degrees.
Then, the second burn to circularize the orbit occurs at around T+3 hours, 33 minutes (in this case, it'll be 04:07 UTC on April 28th). That's followed by payload separation five minutes later over the Indian Ocean (southern hemisphere).
...
Now, I understand it's said that three burns may be utilized. But I thought the above-mentioned profile would make sense.
Going directly into a 23,522 by 200 km orbit from stage separation in one burn is super inefficient and wastes a lot of delta v! I don't know if they even have the performance for that! Even O3b, which goes into a ~2,500 by 8,000 km orbit, has three burns! There is no way this has two.
I thought that the O3b mPOWER missions called for three burns to get the orbital inclination close enough to 0 degrees:
LEO insertion for the first burn. Then, the second burn scrubbing off some of the inclination while raising the apogee. And the third burn raising the perigee while scrubbing off more of the inclination.
...
The Galileo mission profile keeps the orbital inclination the same as the operational orbit (56 degrees), so I don't see how efficient three burns would be for Galileo. Heck, the Galileo missions flown by both Soyuz and Ariane 5 used two upper stage burns.
-
#73
by
GewoonLukas_
on 27 Apr, 2024 10:03
-
-
#74
by
OneSpeed
on 27 Apr, 2024 12:38
-
NGA Rocket Launching notice.
Map from the NGA notice.
-
#75
by
edkyle99
on 27 Apr, 2024 13:16
-
This is, apparently, a total of less than 1.5 tonnes of separable payload going to, or near, 23,616 km x 56 deg while expending the first stage. For comparison, Falcon 9 lifted 4.35 tonne GPS to 392 x 20,163 km x 55 deg while recovering the first stage downrange. Perhaps the payload adapter that holds these two satellites adds enough additional mass to preclude recovery, but it seems a close call to me. Second stage disposal after spacecraft separation is part of the equation as well I suppose.
- Ed Kyle
-
#76
by
Jester
on 27 Apr, 2024 13:34
-
This is, apparently, a total of less than 1.5 tonnes of separable payload going to, or near, 23,616 km x 56 deg while expending the first stage. For comparison, Falcon 9 lifted 4.35 tonne GPS to 392 x 20,163 km x 55 deg while recovering the first stage downrange. Perhaps the payload adapter that holds these two satellites adds enough additional mass to preclude recovery, but it seems a close call to me. Second stage disposal after spacecraft separation is part of the equation as well I suppose.
- Ed Kyle
Correct.
-
#77
by
FutureSpaceTourist
on 27 Apr, 2024 13:36
-
https://twitter.com/_jaykeegan_/status/1784196238746820661Falcon 9 rolled out to LC-39A early this morning ahead of the Galileo FOC FM25 & FM27 mission. Launch is currently scheduled for tonight at 8:34 PM ET (00:34 UTC Sunday) aboard B1060, which will be expended.
Watch live views of 39A on @NASASpaceflight Space Coast Live
nsf.live/starbase
-
#78
by
ZachS09
on 27 Apr, 2024 14:40
-
This is, apparently, a total of less than 1.5 tonnes of separable payload going to, or near, 23,616 km x 56 deg while expending the first stage. For comparison, Falcon 9 lifted 4.35 tonne GPS to 392 x 20,163 km x 55 deg while recovering the first stage downrange. Perhaps the payload adapter that holds these two satellites adds enough additional mass to preclude recovery, but it seems a close call to me. Second stage disposal after spacecraft separation is part of the equation as well I suppose.
- Ed Kyle
Speaking of payload adapters, I sifted through the Arianespace press kits relating to the Soyuz Galileo missions and saw the adapter mass ranges between 150 to 180 kg.
Given a Galileo satellite weighs 733 kg, total payload mass is between 1,616 and 1,646 kg.
-
#79
by
Ron Lee
on 27 Apr, 2024 14:50
-
Second stage disposal after spacecraft separation is part of the equation as well I suppose.
- Ed Kyle
I doubt that we will see a disposal in the ocean. Perhaps a two burn raising of the orbit to get it 200 kilometers or so above the operational Galileo orbit. Element sets may be available after launch and if so will provide that answer.
